/*
    * Copyright 2000-2013 Vaadin Ltd.
    * 
    * Licensed under the Apache License, Version 2.0 (the "License"); you may not
    * use this file except in compliance with the License. You may obtain a copy of
    * the License at
    * 
    * http://www.apache.org/licenses/LICENSE-2.0
    * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations under
   * the License.
   */
  
  package com.vaadin.client.ui;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import com.google.gwt.core.client.JavaScriptObject;
  import com.google.gwt.core.client.Scheduler;
  import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  import com.google.gwt.dom.client.Document;
  import com.google.gwt.dom.client.NativeEvent;
  import com.google.gwt.dom.client.Node;
  import com.google.gwt.dom.client.NodeList;
  import com.google.gwt.dom.client.Style;
  import com.google.gwt.dom.client.Style.Display;
  import com.google.gwt.dom.client.Style.Overflow;
  import com.google.gwt.dom.client.Style.Position;
  import com.google.gwt.dom.client.Style.Unit;
  import com.google.gwt.dom.client.Style.Visibility;
  import com.google.gwt.dom.client.TableCellElement;
  import com.google.gwt.dom.client.TableRowElement;
  import com.google.gwt.dom.client.TableSectionElement;
  import com.google.gwt.dom.client.Touch;
  import com.google.gwt.event.dom.client.BlurEvent;
  import com.google.gwt.event.dom.client.BlurHandler;
  import com.google.gwt.event.dom.client.ContextMenuEvent;
  import com.google.gwt.event.dom.client.ContextMenuHandler;
  import com.google.gwt.event.dom.client.FocusEvent;
  import com.google.gwt.event.dom.client.FocusHandler;
  import com.google.gwt.event.dom.client.KeyCodes;
  import com.google.gwt.event.dom.client.KeyDownEvent;
  import com.google.gwt.event.dom.client.KeyDownHandler;
  import com.google.gwt.event.dom.client.KeyPressEvent;
  import com.google.gwt.event.dom.client.KeyPressHandler;
  import com.google.gwt.event.dom.client.KeyUpEvent;
  import com.google.gwt.event.dom.client.KeyUpHandler;
  import com.google.gwt.event.dom.client.ScrollEvent;
  import com.google.gwt.event.dom.client.ScrollHandler;
  import com.google.gwt.event.logical.shared.CloseEvent;
  import com.google.gwt.event.logical.shared.CloseHandler;
  import com.google.gwt.event.shared.HandlerRegistration;
  import com.google.gwt.user.client.Command;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.Element;
  import com.google.gwt.user.client.Event;
  import com.google.gwt.user.client.Timer;
  import com.google.gwt.user.client.Window;
  import com.google.gwt.user.client.ui.FlowPanel;
  import com.google.gwt.user.client.ui.HasWidgets;
  import com.google.gwt.user.client.ui.Panel;
  import com.google.gwt.user.client.ui.PopupPanel;
  import com.google.gwt.user.client.ui.RootPanel;
  import com.google.gwt.user.client.ui.UIObject;
  import com.google.gwt.user.client.ui.Widget;
  import com.vaadin.client.ApplicationConnection;
  import com.vaadin.client.BrowserInfo;
  import com.vaadin.client.ComponentConnector;
  import com.vaadin.client.ConnectorMap;
  import com.vaadin.client.Focusable;
  import com.vaadin.client.MouseEventDetailsBuilder;
  import com.vaadin.client.TooltipInfo;
  import com.vaadin.client.UIDL;
  import com.vaadin.client.Util;
  import com.vaadin.client.VConsole;
  import com.vaadin.client.VTooltip;
  import com.vaadin.client.ui.VScrollTablePatched.VScrollTableBody.VScrollTableRow;
  import com.vaadin.client.ui.dd.DDUtil;
  import com.vaadin.client.ui.dd.VAbstractDropHandler;
  import com.vaadin.client.ui.dd.VAcceptCallback;
  import com.vaadin.client.ui.dd.VDragAndDropManager;
  import com.vaadin.client.ui.dd.VDragEvent;
  import com.vaadin.client.ui.dd.VHasDropHandler;
  import com.vaadin.client.ui.dd.VTransferable;
  import com.vaadin.shared.AbstractComponentState;
  import com.vaadin.shared.MouseEventDetails;
  import com.vaadin.shared.ui.dd.VerticalDropLocation;
  import com.vaadin.shared.ui.table.TableConstants;
 
 /**
  * VScrollTable
  * 
  * VScrollTable is a FlowPanel having two widgets in it: * TableHead component *
  * ScrollPanel
  * 
  * TableHead contains table's header and widgets + logic for resizing,
  * reordering and hiding columns.
  * 
  * ScrollPanel contains VScrollTableBody object which handles content. To save
  * some bandwidth and to improve clients responsiveness with loads of data, in
  * VScrollTableBody all rows are not necessary rendered. There are "spacers" in
  * VScrollTableBody to use the exact same space as non-rendered rows would use.
  * This way we can use seamlessly traditional scrollbars and scrolling to fetch
  * more rows instead of "paging".
  * 
  * In VScrollTable we listen to scroll events. On horizontal scrolling we also
  * update TableHeads scroll position which has its scrollbars hidden. On
  * vertical scroll events we will check if we are reaching the end of area where
  * we have rows rendered and
  * 
  * TODO implement unregistering for child components in Cells
  */
 public class VScrollTablePatched extends FlowPanel implements HasWidgets,
         ScrollHandler, VHasDropHandler, FocusHandler, BlurHandler, Focusable,
         ActionOwner {
 
 
     protected TableHead createTableHead() {
         return new TableHead();
     }
 
     protected HeaderCell createHeaderCell(String colId, String headerText) {
         return new HeaderCell(colId, headerText);
     }
 
     public static final String STYLENAME = "v-table";
 
     public boolean isVisibleInHierarchy() {
         boolean isVisible = isVisible();
         Widget current = getParent();
         while (isVisible && current != null) {
             isVisible &= current.isVisible();
             current = current.getParent();
         }
         return isVisible;
     }
 
     public enum SelectMode {
         NONE(0), SINGLE(1), MULTI(2);
         private int id;
 
         private SelectMode(int id) {
             this.id = id;
         }
 
         public int getId() {
             return id;
         }
     }
 
     private static final String ROW_HEADER_COLUMN_KEY = "0";
 
     private static final double CACHE_RATE_DEFAULT = 2;
 
     /**
      * The default multi select mode where simple left clicks only selects one
      * item, CTRL+left click selects multiple items and SHIFT-left click selects
      * a range of items.
      */
     private static final int MULTISELECT_MODE_DEFAULT = 0;
 
     /**
      * The simple multiselect mode is what the table used to have before
      * ctrl/shift selections were added. That is that when this is set clicking
      * on an item selects/deselects the item and no ctrl/shift selections are
      * available.
      */
     private static final int MULTISELECT_MODE_SIMPLE = 1;
 
     /**
      * multiple of pagelength which component will cache when requesting more
      * rows
      */
     private double cache_rate = CACHE_RATE_DEFAULT;
     /**
      * fraction of pageLenght which can be scrolled without making new request
      */
     private double cache_react_rate = 0.75 * cache_rate;
 
     public static final char ALIGN_CENTER = 'c';
     public static final char ALIGN_LEFT = 'b';
     public static final char ALIGN_RIGHT = 'e';
     private static final int CHARCODE_SPACE = 32;
     private int firstRowInViewPort = 0;
     private int pageLength = 15;
     private int lastRequestedFirstvisible = 0; // to detect "serverside scroll"
     private int firstvisibleOnLastPage = -1; // To detect if the first visible
                                              // is on the last page
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean showRowHeaders = false;
 
     private String[] columnOrder;
 
     protected ApplicationConnection client;
 
     /** For internal use only. May be removed or replaced in the future. */
     public String paintableId;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean immediate;
 
     private boolean nullSelectionAllowed = true;
 
     private SelectMode selectMode = SelectMode.NONE;
 
     public final HashSet<String> selectedRowKeys = new HashSet<String>();
 
     /*
      * When scrolling and selecting at the same time, the selections are not in
      * sync with the server while retrieving new rows (until key is released).
      */
     private HashSet<Object> unSyncedselectionsBeforeRowFetch;
 
     /*
      * These are used when jumping between pages when pressing Home and End
      */
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean selectLastItemInNextRender = false;
     /** For internal use only. May be removed or replaced in the future. */
     public boolean selectFirstItemInNextRender = false;
     /** For internal use only. May be removed or replaced in the future. */
     public boolean focusFirstItemInNextRender = false;
     /** For internal use only. May be removed or replaced in the future. */
     public boolean focusLastItemInNextRender = false;
 
     /**
      * The currently focused row.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public VScrollTableRow focusedRow;
 
     /**
      * Helper to store selection range start in when using the keyboard
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public VScrollTableRow selectionRangeStart;
 
     /**
      * Flag for notifying when the selection has changed and should be sent to
      * the server
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public boolean selectionChanged = false;
 
     /*
      * The speed (in pixels) which the scrolling scrolls vertically/horizontally
      */
     private int scrollingVelocity = 10;
 
     private Timer scrollingVelocityTimer = null;
 
     /** For internal use only. May be removed or replaced in the future. */
     public String[] bodyActionKeys;
 
     private boolean enableDebug = false;
 
     private static final boolean hasNativeTouchScrolling = BrowserInfo.get()
             .isTouchDevice()
             && !BrowserInfo.get().requiresTouchScrollDelegate();
 
     private Set<String> noncollapsibleColumns;
 
     /**
      * The last known row height used to preserve the height of a table with
      * custom row heights and a fixed page length after removing the last row
      * from the table.
      * 
      * A new VScrollTableBody instance is created every time the number of rows
      * changes causing {@link VScrollTableBody#rowHeight} to be discarded and
      * the height recalculated by {@link VScrollTableBody#getRowHeight(boolean)}
      * to avoid some rounding problems, e.g. round(2 * 19.8) / 2 = 20 but
      * round(3 * 19.8) / 3 = 19.66.
      */
     private double lastKnownRowHeight = Double.NaN;
 
     /**
      * Remember scroll position when getting detached to properly scroll back to
      * the location that there is data for if getting attached again.
      */
     private int detachedScrollPosition = 0;
 
     /**
      * Represents a select range of rows
      */
     private class SelectionRange {
         private VScrollTableRow startRow;
         private final int length;
 
         /**
          * Constuctor.
          */
         public SelectionRange(VScrollTableRow row1, VScrollTableRow row2) {
             VScrollTableRow endRow;
             if (row2.isBefore(row1)) {
                 startRow = row2;
                 endRow = row1;
             } else {
                 startRow = row1;
                 endRow = row2;
             }
             length = endRow.getIndex() - startRow.getIndex() + 1;
         }
 
         public SelectionRange(VScrollTableRow row, int length) {
             startRow = row;
             this.length = length;
         }
 
         /*
          * (non-Javadoc)
          * 
          * @see java.lang.Object#toString()
          */
 
         @Override
         public String toString() {
             return startRow.getKey() + "-" + length;
         }
 
         private boolean inRange(VScrollTableRow row) {
             return row.getIndex() >= startRow.getIndex()
                     && row.getIndex() < startRow.getIndex() + length;
         }
 
         public Collection<SelectionRange> split(VScrollTableRow row) {
             assert row.isAttached();
             ArrayList<SelectionRange> ranges = new ArrayList<SelectionRange>(2);
 
             int endOfFirstRange = row.getIndex() - 1;
             if (!(endOfFirstRange - startRow.getIndex() < 0)) {
                 // create range of first part unless its length is < 1
                 ranges.add(new SelectionRange(startRow, endOfFirstRange
                         - startRow.getIndex() + 1));
             }
             int startOfSecondRange = row.getIndex() + 1;
             if (!(getEndIndex() - startOfSecondRange < 0)) {
                 // create range of second part unless its length is < 1
                 VScrollTableRow startOfRange = scrollBody
                         .getRowByRowIndex(startOfSecondRange);
                 if (startOfRange != null) {
                     ranges.add(new SelectionRange(startOfRange, getEndIndex()
                             - startOfSecondRange + 1));
                 }
             }
             return ranges;
         }
 
         private int getEndIndex() {
             return startRow.getIndex() + length - 1;
         }
 
     };
 
     private final HashSet<SelectionRange> selectedRowRanges = new HashSet<SelectionRange>();
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean initializedAndAttached = false;
 
     /**
      * Flag to indicate if a column width recalculation is needed due update.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public boolean headerChangedDuringUpdate = false;
 
     /** For internal use only. May be removed or replaced in the future. */
     public final TableHead tHead = createTableHead();
 
     /** For internal use only. May be removed or replaced in the future. */
     public final TableFooter tFoot = new TableFooter();
 
     /** For internal use only. May be removed or replaced in the future. */
     public final FocusableScrollPanel scrollBodyPanel = new FocusableScrollPanel(
             true);
 
     private KeyPressHandler navKeyPressHandler = new KeyPressHandler() {
 
         @Override
         public void onKeyPress(KeyPressEvent keyPressEvent) {
             // This is used for Firefox only, since Firefox auto-repeat
             // works correctly only if we use a key press handler, other
             // browsers handle it correctly when using a key down handler
             if (!BrowserInfo.get().isGecko()) {
                 return;
             }
 
             NativeEvent event = keyPressEvent.getNativeEvent();
             if (!enabled) {
                 // Cancel default keyboard events on a disabled Table
                 // (prevents scrolling)
                 event.preventDefault();
             } else if (hasFocus) {
                 // Key code in Firefox/onKeyPress is present only for
                 // special keys, otherwise 0 is returned
                 int keyCode = event.getKeyCode();
                 if (keyCode == 0 && event.getCharCode() == ' ') {
                     // Provide a keyCode for space to be compatible with
                     // FireFox keypress event
                     keyCode = CHARCODE_SPACE;
                 }
 
                 if (handleNavigation(keyCode,
                         event.getCtrlKey() || event.getMetaKey(),
                         event.getShiftKey())) {
                     event.preventDefault();
                 }
 
                 startScrollingVelocityTimer();
             }
         }
 
     };
 
     private KeyUpHandler navKeyUpHandler = new KeyUpHandler() {
 
         @Override
         public void onKeyUp(KeyUpEvent keyUpEvent) {
             NativeEvent event = keyUpEvent.getNativeEvent();
             int keyCode = event.getKeyCode();
 
             if (!isFocusable()) {
                 cancelScrollingVelocityTimer();
             } else if (isNavigationKey(keyCode)) {
                 if (keyCode == getNavigationDownKey()
                         || keyCode == getNavigationUpKey()) {
                     /*
                      * in multiselect mode the server may still have value from
                      * previous page. Clear it unless doing multiselection or
                      * just moving focus.
                      */
                     if (!event.getShiftKey() && !event.getCtrlKey()) {
                         instructServerToForgetPreviousSelections();
                     }
                     sendSelectedRows();
                 }
                 cancelScrollingVelocityTimer();
                 navKeyDown = false;
             }
         }
     };
 
     private KeyDownHandler navKeyDownHandler = new KeyDownHandler() {
 
         @Override
         public void onKeyDown(KeyDownEvent keyDownEvent) {
             NativeEvent event = keyDownEvent.getNativeEvent();
             // This is not used for Firefox
             if (BrowserInfo.get().isGecko()) {
                 return;
             }
 
             if (!enabled) {
                 // Cancel default keyboard events on a disabled Table
                 // (prevents scrolling)
                 event.preventDefault();
             } else if (hasFocus) {
                 if (handleNavigation(event.getKeyCode(), event.getCtrlKey()
                         || event.getMetaKey(), event.getShiftKey())) {
                     navKeyDown = true;
                     event.preventDefault();
                 }
 
                 startScrollingVelocityTimer();
             }
         }
     };
 
     /** For internal use only. May be removed or replaced in the future. */
     public int totalRows;
 
     private Set<String> collapsedColumns;
 
     /** For internal use only. May be removed or replaced in the future. */
     public final RowRequestHandler rowRequestHandler;
 
     /** For internal use only. May be removed or replaced in the future. */
     public VScrollTableBody scrollBody;
 
     private int firstvisible = 0;
     private boolean sortAscending;
     private String sortColumn;
     private String oldSortColumn;
     private boolean columnReordering;
 
     /**
      * This map contains captions and icon urls for actions like: * "33_c" ->
      * "Edit" * "33_i" -> "http://dom.com/edit.png"
      */
     private final HashMap<Object, String> actionMap = new HashMap<Object, String>();
     private String[] visibleColOrder;
     private boolean initialContentReceived = false;
     private Element scrollPositionElement;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean enabled;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean showColHeaders;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean showColFooters;
 
     /** flag to indicate that table body has changed */
     private boolean isNewBody = true;
 
     /**
      * Read from the "recalcWidths" -attribute. When it is true, the table will
      * recalculate the widths for columns - desirable in some cases. For #1983,
      * marked experimental. See also variable <code>refreshContentWidths</code>
      * in method {@link TableHead#updateCellsFromUIDL(UIDL)}.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public boolean recalcWidths = false;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean rendering = false;
 
     private boolean hasFocus = false;
     private int dragmode;
 
     protected int multiselectmode;
 
     /** For internal use only. May be removed or replaced in the future. */
     public int tabIndex;
 
     private TouchScrollDelegate touchScrollDelegate;
 
     /** For internal use only. May be removed or replaced in the future. */
     public int lastRenderedHeight;
 
     /**
      * Values (serverCacheFirst+serverCacheLast) sent by server that tells which
      * rows (indexes) are in the server side cache (page buffer). -1 means
      * unknown. The server side cache row MUST MATCH the client side cache rows.
      * 
      * If the client side cache contains additional rows with e.g. buttons, it
      * will cause out of sync when such a button is pressed.
      * 
      * If the server side cache contains additional rows with e.g. buttons,
      * scrolling in the client will cause empty buttons to be rendered
      * (cached=true request for non-existing components)
      * 
      * For internal use only. May be removed or replaced in the future.
      */
     public int serverCacheFirst = -1;
     public int serverCacheLast = -1;
 
     /**
      * In several cases TreeTable depends on the scrollBody.lastRendered being
      * 'out of sync' while the update is being done. In those cases the sanity
      * check must be performed afterwards.
      */
     public boolean postponeSanityCheckForLastRendered;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean sizeNeedsInit = true;
 
     /**
      * Used to recall the position of an open context menu if we need to close
      * and reopen it during a row update.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public class ContextMenuDetails implements CloseHandler<PopupPanel> {
         public String rowKey;
         public int left;
         public int top;
         HandlerRegistration closeRegistration;
 
         public ContextMenuDetails(VContextMenu menu, String rowKey, int left,
                 int top) {
             this.rowKey = rowKey;
             this.left = left;
             this.top = top;
             closeRegistration = menu.addCloseHandler(this);
         }
 
         @Override
         public void onClose(CloseEvent<PopupPanel> event) {
             contextMenu = null;
             closeRegistration.removeHandler();
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public ContextMenuDetails contextMenu = null;
 
     private boolean hadScrollBars = false;
 
     public VScrollTablePatched() {
         setMultiSelectMode(MULTISELECT_MODE_DEFAULT);
 
         scrollBodyPanel.addFocusHandler(this);
         scrollBodyPanel.addBlurHandler(this);
 
         scrollBodyPanel.addScrollHandler(this);
 
         /*
          * Firefox auto-repeat works correctly only if we use a key press
          * handler, other browsers handle it correctly when using a key down
          * handler
          */
         if (BrowserInfo.get().isGecko()) {
             scrollBodyPanel.addKeyPressHandler(navKeyPressHandler);
         } else {
             scrollBodyPanel.addKeyDownHandler(navKeyDownHandler);
         }
         scrollBodyPanel.addKeyUpHandler(navKeyUpHandler);
 
         scrollBodyPanel.sinkEvents(Event.TOUCHEVENTS);
 
         scrollBodyPanel.sinkEvents(Event.ONCONTEXTMENU);
         scrollBodyPanel.addDomHandler(new ContextMenuHandler() {
 
             @Override
             public void onContextMenu(ContextMenuEvent event) {
                 handleBodyContextMenu(event);
             }
         }, ContextMenuEvent.getType());
 
         setStyleName(STYLENAME);
 
         add(tHead);
         add(scrollBodyPanel);
         add(tFoot);
 
         rowRequestHandler = new RowRequestHandler();
     }
 
     @Override
     public void setStyleName(String style) {
         updateStyleNames(style, false);
     }
 
     @Override
     public void setStylePrimaryName(String style) {
         updateStyleNames(style, true);
     }
 
     private void updateStyleNames(String newStyle, boolean isPrimary) {
         scrollBodyPanel
                 .removeStyleName(getStylePrimaryName() + "-body-wrapper");
         scrollBodyPanel.removeStyleName(getStylePrimaryName() + "-body");
 
         if (scrollBody != null) {
             scrollBody.removeStyleName(getStylePrimaryName()
                     + "-body-noselection");
         }
 
         if (isPrimary) {
             super.setStylePrimaryName(newStyle);
         } else {
             super.setStyleName(newStyle);
         }
 
         scrollBodyPanel.addStyleName(getStylePrimaryName() + "-body-wrapper");
         scrollBodyPanel.addStyleName(getStylePrimaryName() + "-body");
 
         tHead.updateStyleNames(getStylePrimaryName());
         tFoot.updateStyleNames(getStylePrimaryName());
 
         if (scrollBody != null) {
             scrollBody.updateStyleNames(getStylePrimaryName());
         }
     }
 
     public void init(ApplicationConnection client) {
         this.client = client;
         // Add a handler to clear saved context menu details when the menu
         // closes. See #8526.
         client.getContextMenu().addCloseHandler(new CloseHandler<PopupPanel>() {
 
             @Override
             public void onClose(CloseEvent<PopupPanel> event) {
                 contextMenu = null;
             }
         });
     }
 
     private void handleBodyContextMenu(ContextMenuEvent event) {
         if (enabled && bodyActionKeys != null) {
             int left = Util.getTouchOrMouseClientX(event.getNativeEvent());
             int top = Util.getTouchOrMouseClientY(event.getNativeEvent());
             top += Window.getScrollTop();
             left += Window.getScrollLeft();
             client.getContextMenu().showAt(this, left, top);
 
             // Only prevent browser context menu if there are action handlers
             // registered
             event.stopPropagation();
             event.preventDefault();
         }
     }
 
     /**
      * Fires a column resize event which sends the resize information to the
      * server.
      * 
      * @param columnId
      *            The columnId of the column which was resized
      * @param originalWidth
      *            The width in pixels of the column before the resize event
      * @param newWidth
      *            The width in pixels of the column after the resize event
      */
     private void fireColumnResizeEvent(String columnId, int originalWidth,
             int newWidth) {
         client.updateVariable(paintableId, "columnResizeEventColumn", columnId,
                 false);
         client.updateVariable(paintableId, "columnResizeEventPrev",
                 originalWidth, false);
         client.updateVariable(paintableId, "columnResizeEventCurr", newWidth,
                 immediate);
 
     }
 
     /**
      * Non-immediate variable update of column widths for a collection of
      * columns.
      * 
      * @param columns
      *            the columns to trigger the events for.
      */
     private void sendColumnWidthUpdates(Collection<HeaderCell> columns) {
         String[] newSizes = new String[columns.size()];
         int ix = 0;
         for (HeaderCell cell : columns) {
             newSizes[ix++] = cell.getColKey() + ":" + cell.getWidth();
         }
         client.updateVariable(paintableId, "columnWidthUpdates", newSizes,
                 false);
     }
 
     /**
      * Moves the focus one step down
      * 
      * @return Returns true if succeeded
      */
     private boolean moveFocusDown() {
         return moveFocusDown(0);
     }
 
     /**
      * Moves the focus down by 1+offset rows
      * 
      * @return Returns true if succeeded, else false if the selection could not
      *         be move downwards
      */
     private boolean moveFocusDown(int offset) {
         if (isSelectable()) {
             if (focusedRow == null && scrollBody.iterator().hasNext()) {
                 // FIXME should focus first visible from top, not first rendered
                 // ??
                 return setRowFocus((VScrollTableRow) scrollBody.iterator()
                         .next());
             } else {
                 VScrollTableRow next = getNextRow(focusedRow, offset);
                 if (next != null) {
                     return setRowFocus(next);
                 }
             }
         }
 
         return false;
     }
 
     /**
      * Moves the selection one step up
      * 
      * @return Returns true if succeeded
      */
     private boolean moveFocusUp() {
         return moveFocusUp(0);
     }
 
     /**
      * Moves the focus row upwards
      * 
      * @return Returns true if succeeded, else false if the selection could not
      *         be move upwards
      * 
      */
     private boolean moveFocusUp(int offset) {
         if (isSelectable()) {
             if (focusedRow == null && scrollBody.iterator().hasNext()) {
                 // FIXME logic is exactly the same as in moveFocusDown, should
                 // be the opposite??
                 return setRowFocus((VScrollTableRow) scrollBody.iterator()
                         .next());
             } else {
                 VScrollTableRow prev = getPreviousRow(focusedRow, offset);
                 if (prev != null) {
                     return setRowFocus(prev);
                 } else {
                     VConsole.log("no previous available");
                 }
             }
         }
 
         return false;
     }
 
     /**
      * Selects a row where the current selection head is
      * 
      * @param ctrlSelect
      *            Is the selection a ctrl+selection
      * @param shiftSelect
      *            Is the selection a shift+selection
      * @return Returns truw
      */
     private void selectFocusedRow(boolean ctrlSelect, boolean shiftSelect) {
         if (focusedRow != null) {
             // Arrows moves the selection and clears previous selections
             if (isSelectable() && !ctrlSelect && !shiftSelect) {
                 deselectAll();
                 focusedRow.toggleSelection();
                 selectionRangeStart = focusedRow;
             } else if (isSelectable() && ctrlSelect && !shiftSelect) {
                 // Ctrl+arrows moves selection head
                 selectionRangeStart = focusedRow;
                 // No selection, only selection head is moved
             } else if (isMultiSelectModeAny() && !ctrlSelect && shiftSelect) {
                 // Shift+arrows selection selects a range
                 focusedRow.toggleShiftSelection(shiftSelect);
             }
         }
     }
 
     /**
      * Sends the selection to the server if changed since the last update/visit.
      */
     protected void sendSelectedRows() {
         sendSelectedRows(immediate);
     }
 
     /**
      * Sends the selection to the server if it has been changed since the last
      * update/visit.
      * 
      * @param immediately
      *            set to true to immediately send the rows
      */
     protected void sendSelectedRows(boolean immediately) {
         // Don't send anything if selection has not changed
         if (!selectionChanged) {
             return;
         }
 
         // Reset selection changed flag
         selectionChanged = false;
 
         // Note: changing the immediateness of this might require changes to
         // "clickEvent" immediateness also.
         if (isMultiSelectModeDefault()) {
             // Convert ranges to a set of strings
             Set<String> ranges = new HashSet<String>();
             for (SelectionRange range : selectedRowRanges) {
                 ranges.add(range.toString());
             }
 
             // Send the selected row ranges
             client.updateVariable(paintableId, "selectedRanges",
                     ranges.toArray(new String[selectedRowRanges.size()]), false);
 
             // clean selectedRowKeys so that they don't contain excess values
             for (Iterator<String> iterator = selectedRowKeys.iterator(); iterator
                     .hasNext();) {
                 String key = iterator.next();
                 VScrollTableRow renderedRowByKey = getRenderedRowByKey(key);
                 if (renderedRowByKey != null) {
                     for (SelectionRange range : selectedRowRanges) {
                         if (range.inRange(renderedRowByKey)) {
                             iterator.remove();
                         }
                     }
                 } else {
                     // orphaned selected key, must be in a range, ignore
                     iterator.remove();
                 }
 
             }
         }
 
         // Send the selected rows
         client.updateVariable(paintableId, "selected",
                 selectedRowKeys.toArray(new String[selectedRowKeys.size()]),
                 false);
 
         if (immediately) {
             selectionSynchronizer.schedule(500);
         }
     }
 
     private Timer selectionSynchronizer = new Timer() {
         @Override
         public void run() {
             client.sendPendingVariableChanges();
         }
     };
 
     /**
      * Get the key that moves the selection head upwards. By default it is the
      * up arrow key but by overriding this you can change the key to whatever
      * you want.
      * 
      * @return The keycode of the key
      */
     protected int getNavigationUpKey() {
         return KeyCodes.KEY_UP;
     }
 
     /**
      * Get the key that moves the selection head downwards. By default it is the
      * down arrow key but by overriding this you can change the key to whatever
      * you want.
      * 
      * @return The keycode of the key
      */
     protected int getNavigationDownKey() {
         return KeyCodes.KEY_DOWN;
     }
 
     /**
      * Get the key that scrolls to the left in the table. By default it is the
      * left arrow key but by overriding this you can change the key to whatever
      * you want.
      * 
      * @return The keycode of the key
      */
     protected int getNavigationLeftKey() {
         return KeyCodes.KEY_LEFT;
     }
 
     /**
      * Get the key that scroll to the right on the table. By default it is the
      * right arrow key but by overriding this you can change the key to whatever
      * you want.
      * 
      * @return The keycode of the key
      */
     protected int getNavigationRightKey() {
         return KeyCodes.KEY_RIGHT;
     }
 
     /**
      * Get the key that selects an item in the table. By default it is the space
      * bar key but by overriding this you can change the key to whatever you
      * want.
      * 
      * @return
      */
     protected int getNavigationSelectKey() {
         return CHARCODE_SPACE;
     }
 
     /**
      * Get the key the moves the selection one page up in the table. By default
      * this is the Page Up key but by overriding this you can change the key to
      * whatever you want.
      * 
      * @return
      */
     protected int getNavigationPageUpKey() {
         return KeyCodes.KEY_PAGEUP;
     }
 
     /**
      * Get the key the moves the selection one page down in the table. By
      * default this is the Page Down key but by overriding this you can change
      * the key to whatever you want.
      * 
      * @return
      */
     protected int getNavigationPageDownKey() {
         return KeyCodes.KEY_PAGEDOWN;
     }
 
     /**
      * Get the key the moves the selection to the beginning of the table. By
      * default this is the Home key but by overriding this you can change the
      * key to whatever you want.
      * 
      * @return
      */
     protected int getNavigationStartKey() {
         return KeyCodes.KEY_HOME;
     }
 
     /**
      * Get the key the moves the selection to the end of the table. By default
      * this is the End key but by overriding this you can change the key to
      * whatever you want.
      * 
      * @return
      */
     protected int getNavigationEndKey() {
         return KeyCodes.KEY_END;
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void initializeRows(UIDL uidl, UIDL rowData) {
         if (scrollBody != null) {
             scrollBody.removeFromParent();
         }
         scrollBody = createScrollBody();
 
         scrollBody.renderInitialRows(rowData, uidl.getIntAttribute("firstrow"),
                 uidl.getIntAttribute("rows"));
         scrollBodyPanel.add(scrollBody);
 
         // New body starts scrolled to the left, make sure the header and footer
         // are also scrolled to the left
         tHead.setHorizontalScrollPosition(0);
         tFoot.setHorizontalScrollPosition(0);
 
         initialContentReceived = true;
         sizeNeedsInit = true;
         scrollBody.restoreRowVisibility();
 
         // scroll to selection
         if (scrollBodyPanel != null) {
             VScrollTableRow row;
             if (selectedRowKeys.size() == 1) {
                 String selectedRowKey = selectedRowKeys.iterator().next();
                 row = getRenderedRowByKey(selectedRowKey);
             } else {
                 row = (VScrollTableRow) scrollBody.iterator().next();
             }
             lazyRevertFocusToRow(row);
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateColumnProperties(UIDL uidl) {
         updateColumnOrder(uidl);
 
         updateCollapsedColumns(uidl);
 
         UIDL vc = uidl.getChildByTagName("visiblecolumns");
         if (vc != null) {
             tHead.updateCellsFromUIDL(vc);
             tFoot.updateCellsFromUIDL(vc);
         }
 
         updateHeader(uidl.getStringArrayAttribute("vcolorder"));
         updateFooter(uidl.getStringArrayAttribute("vcolorder"));
         if (uidl.hasVariable("noncollapsiblecolumns")) {
             noncollapsibleColumns = uidl
                     .getStringArrayVariableAsSet("noncollapsiblecolumns");
         }
     }
 
     private void updateCollapsedColumns(UIDL uidl) {
         if (uidl.hasVariable("collapsedcolumns")) {
             tHead.setColumnCollapsingAllowed(true);
             collapsedColumns = uidl
                     .getStringArrayVariableAsSet("collapsedcolumns");
         } else {
             tHead.setColumnCollapsingAllowed(false);
         }
     }
 
     private void updateColumnOrder(UIDL uidl) {
         if (uidl.hasVariable("columnorder")) {
             columnReordering = true;
             columnOrder = uidl.getStringArrayVariable("columnorder");
         } else {
             columnReordering = false;
             columnOrder = null;
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean selectSelectedRows(UIDL uidl) {
         boolean keyboardSelectionOverRowFetchInProgress = false;
 
         if (uidl.hasVariable("selected")) {
             final Set<String> selectedKeys = uidl
                     .getStringArrayVariableAsSet("selected");
             if (scrollBody != null) {
                 Iterator<Widget> iterator = scrollBody.iterator();
                 while (iterator.hasNext()) {
                     /*
                      * Make the focus reflect to the server side state unless we
                      * are currently selecting multiple rows with keyboard.
                      */
                     VScrollTableRow row = (VScrollTableRow) iterator.next();
                     boolean selected = selectedKeys.contains(row.getKey());
                     if (!selected
                             && unSyncedselectionsBeforeRowFetch != null
                             && unSyncedselectionsBeforeRowFetch.contains(row
                                     .getKey())) {
                         selected = true;
                         keyboardSelectionOverRowFetchInProgress = true;
                     }
                     if (selected != row.isSelected()) {
                         row.toggleSelection();
                         if (!isSingleSelectMode() && !selected) {
                             // Update selection range in case a row is
                             // unselected from the middle of a range - #8076
                             removeRowFromUnsentSelectionRanges(row);
                         }
                     }
                 }
             }
         }
         unSyncedselectionsBeforeRowFetch = null;
         return keyboardSelectionOverRowFetchInProgress;
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateSortingProperties(UIDL uidl) {
         oldSortColumn = sortColumn;
         if (uidl.hasVariable("sortascending")) {
             sortAscending = uidl.getBooleanVariable("sortascending");
             sortColumn = uidl.getStringVariable("sortcolumn");
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void resizeSortedColumnForSortIndicator() {
         // Force recalculation of the captionContainer element inside the header
         // cell to accomodate for the size of the sort arrow.
         HeaderCell sortedHeader = tHead.getHeaderCell(sortColumn);
         if (sortedHeader != null) {
             tHead.resizeCaptionContainer(sortedHeader);
         }
         // Also recalculate the width of the captionContainer element in the
         // previously sorted header, since this now has more room.
         HeaderCell oldSortedHeader = tHead.getHeaderCell(oldSortColumn);
         if (oldSortedHeader != null) {
             tHead.resizeCaptionContainer(oldSortedHeader);
         }
     }
 
     private ScheduledCommand lazyScroller = new ScheduledCommand() {
         @Override
         public void execute() {
             if (firstvisible > 0) {
                 firstRowInViewPort = firstvisible;
                 if (firstvisibleOnLastPage > -1) {
                     scrollBodyPanel
                             .setScrollPosition(measureRowHeightOffset(firstvisibleOnLastPage));
                 } else {
                     scrollBodyPanel
                             .setScrollPosition(measureRowHeightOffset(firstvisible));
                 }
             }
         }
     };
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateFirstVisibleAndScrollIfNeeded(UIDL uidl) {
         firstvisible = uidl.hasVariable("firstvisible") ? uidl
                 .getIntVariable("firstvisible") : 0;
         firstvisibleOnLastPage = uidl.hasVariable("firstvisibleonlastpage") ? uidl
                 .getIntVariable("firstvisibleonlastpage") : -1;
         if (firstvisible != lastRequestedFirstvisible && scrollBody != null) {
 
             // Update lastRequestedFirstvisible right away here
             // (don't rely on update in the timer which could be cancelled).
             lastRequestedFirstvisible = firstRowInViewPort;
 
             // Only scroll if the first visible changes from the server side.
             // Else we might unintentionally scroll even when the scroll
             // position has not changed.
             Scheduler.get().scheduleDeferred(lazyScroller);
         }
     }
 
     protected int measureRowHeightOffset(int rowIx) {
         return (int) (rowIx * scrollBody.getRowHeight());
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updatePageLength(UIDL uidl) {
         int oldPageLength = pageLength;
         if (uidl.hasAttribute("pagelength")) {
             pageLength = uidl.getIntAttribute("pagelength");
         } else {
             // pagelenght is "0" meaning scrolling is turned off
             pageLength = totalRows;
         }
 
         if (oldPageLength != pageLength && initializedAndAttached) {
             // page length changed, need to update size
             sizeNeedsInit = true;
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateSelectionProperties(UIDL uidl,
             AbstractComponentState state, boolean readOnly) {
         setMultiSelectMode(uidl.hasAttribute("multiselectmode") ? uidl
                 .getIntAttribute("multiselectmode") : MULTISELECT_MODE_DEFAULT);
 
         nullSelectionAllowed = uidl.hasAttribute("nsa") ? uidl
                 .getBooleanAttribute("nsa") : true;
 
         if (uidl.hasAttribute("selectmode")) {
             if (readOnly) {
                 selectMode = SelectMode.NONE;
             } else if (uidl.getStringAttribute("selectmode").equals("multi")) {
                 selectMode = SelectMode.MULTI;
             } else if (uidl.getStringAttribute("selectmode").equals("single")) {
                 selectMode = SelectMode.SINGLE;
             } else {
                 selectMode = SelectMode.NONE;
             }
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateDragMode(UIDL uidl) {
         dragmode = uidl.hasAttribute("dragmode") ? uidl
                 .getIntAttribute("dragmode") : 0;
         if (BrowserInfo.get().isIE()) {
             if (dragmode > 0) {
                 getElement().setPropertyJSO("onselectstart",
                         getPreventTextSelectionIEHack());
             } else {
                 getElement().setPropertyJSO("onselectstart", null);
             }
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateTotalRows(UIDL uidl) {
         int newTotalRows = uidl.getIntAttribute("totalrows");
         if (newTotalRows != getTotalRows()) {
             if (scrollBody != null) {
                 if (getTotalRows() == 0) {
                     tHead.clear();
                     tFoot.clear();
                 }
                 initializedAndAttached = false;
                 initialContentReceived = false;
                 isNewBody = true;
             }
             setTotalRows(newTotalRows);
         }
     }
 
     protected void setTotalRows(int newTotalRows) {
         totalRows = newTotalRows;
     }
 
     public int getTotalRows() {
         return totalRows;
     }
 
     /**
      * Returns the extra space that is given to the header column when column
      * width is determined by header text.
      * 
      * @return extra space in pixels
      */
     private int getHeaderPadding() {
         return scrollBody.getCellExtraWidth();
     }
 
     /**
      * This method exists for the needs of {@link VTreeTable} only. Not part of
      * the official API, <b>extend at your own risk</b>. May be removed or
      * replaced in the future.
      * 
      * @return index of TreeTable's hierarchy column, or -1 if not applicable
      */
     protected int getHierarchyColumnIndex() {
         return -1;
     }
 
     /**
      * For internal use only. May be removed or replaced in the future.
      */
     public void updateMaxIndent() {
         int oldIndent = scrollBody.getMaxIndent();
         scrollBody.calculateMaxIndent();
         if (oldIndent != scrollBody.getMaxIndent()) {
             // indent updated, headers might need adjusting
             triggerLazyColumnAdjustment(true);
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void focusRowFromBody() {
         if (selectedRowKeys.size() == 1) {
             // try to focus a row currently selected and in viewport
             String selectedRowKey = selectedRowKeys.iterator().next();
             if (selectedRowKey != null) {
                 VScrollTableRow renderedRow = getRenderedRowByKey(selectedRowKey);
                 if (renderedRow == null || !renderedRow.isInViewPort()) {
                     setRowFocus(scrollBody.getRowByRowIndex(firstRowInViewPort));
                 } else {
                     setRowFocus(renderedRow);
                 }
             }
         } else {
             // multiselect mode
             setRowFocus(scrollBody.getRowByRowIndex(firstRowInViewPort));
         }
     }
 
     protected VScrollTableBody createScrollBody() {
         return new VScrollTableBody();
     }
 
     /**
      * Selects the last row visible in the table
      * <p>
      * For internal use only. May be removed or replaced in the future.
      * 
      * @param focusOnly
      *            Should the focus only be moved to the last row
      */
     public void selectLastRenderedRowInViewPort(boolean focusOnly) {
         int index = firstRowInViewPort + getFullyVisibleRowCount();
         VScrollTableRow lastRowInViewport = scrollBody.getRowByRowIndex(index);
         if (lastRowInViewport == null) {
             // this should not happen in normal situations (white space at the
             // end of viewport). Select the last rendered as a fallback.
             lastRowInViewport = scrollBody.getRowByRowIndex(scrollBody
                     .getLastRendered());
             if (lastRowInViewport == null) {
                 return; // empty table
             }
         }
         setRowFocus(lastRowInViewport);
         if (!focusOnly) {
             selectFocusedRow(false, multiselectPending);
             sendSelectedRows();
         }
     }
 
     /**
      * Selects the first row visible in the table
      * <p>
      * For internal use only. May be removed or replaced in the future.
      * 
      * @param focusOnly
      *            Should the focus only be moved to the first row
      */
     public void selectFirstRenderedRowInViewPort(boolean focusOnly) {
         int index = firstRowInViewPort;
         VScrollTableRow firstInViewport = scrollBody.getRowByRowIndex(index);
         if (firstInViewport == null) {
             // this should not happen in normal situations
             return;
         }
         setRowFocus(firstInViewport);
         if (!focusOnly) {
             selectFocusedRow(false, multiselectPending);
             sendSelectedRows();
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void setCacheRateFromUIDL(UIDL uidl) {
         setCacheRate(uidl.hasAttribute("cr") ? uidl.getDoubleAttribute("cr")
                 : CACHE_RATE_DEFAULT);
     }
 
     private void setCacheRate(double d) {
         if (cache_rate != d) {
             cache_rate = d;
             cache_react_rate = 0.75 * d;
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateActionMap(UIDL mainUidl) {
         UIDL actionsUidl = mainUidl.getChildByTagName("actions");
         if (actionsUidl == null) {
             return;
         }
 
         final Iterator<?> it = actionsUidl.getChildIterator();
         while (it.hasNext()) {
             final UIDL action = (UIDL) it.next();
             final String key = action.getStringAttribute("key");
             final String caption = action.getStringAttribute("caption");
             actionMap.put(key + "_c", caption);
             if (action.hasAttribute("icon")) {
                 // TODO need some uri handling ??
                 actionMap.put(key + "_i", client.translateVaadinUri(action
                         .getStringAttribute("icon")));
             } else {
                 actionMap.remove(key + "_i");
             }
         }
 
     }
 
     public String getActionCaption(String actionKey) {
         return actionMap.get(actionKey + "_c");
     }
 
     public String getActionIcon(String actionKey) {
         return actionMap.get(actionKey + "_i");
     }
 
     private void updateHeader(String[] strings) {
         if (strings == null) {
             return;
         }
 
         int visibleCols = strings.length;
         int colIndex = 0;
         if (showRowHeaders) {
             tHead.enableColumn(ROW_HEADER_COLUMN_KEY, colIndex);
             visibleCols++;
             visibleColOrder = new String[visibleCols];
             visibleColOrder[colIndex] = ROW_HEADER_COLUMN_KEY;
             colIndex++;
         } else {
             visibleColOrder = new String[visibleCols];
             tHead.removeCell(ROW_HEADER_COLUMN_KEY);
         }
 
         int i;
         for (i = 0; i < strings.length; i++) {
             final String cid = strings[i];
             visibleColOrder[colIndex] = cid;
             tHead.enableColumn(cid, colIndex);
             colIndex++;
         }
 
         tHead.setVisible(showColHeaders);
         setContainerHeight();
 
     }
 
     /**
      * Updates footers.
      * <p>
      * Update headers whould be called before this method is called!
      * </p>
      * 
      * @param strings
      */
     private void updateFooter(String[] strings) {
         if (strings == null) {
             return;
         }
 
         // Add dummy column if row headers are present
         int colIndex = 0;
         if (showRowHeaders) {
             tFoot.enableColumn(ROW_HEADER_COLUMN_KEY, colIndex);
             colIndex++;
         } else {
             tFoot.removeCell(ROW_HEADER_COLUMN_KEY);
         }
 
         int i;
         for (i = 0; i < strings.length; i++) {
             final String cid = strings[i];
             tFoot.enableColumn(cid, colIndex);
             colIndex++;
         }
 
         tFoot.setVisible(showColFooters);
     }
 
     /**
      * For internal use only. May be removed or replaced in the future.
      * 
      * @param uidl
      *            which contains row data
      * @param firstRow
      *            first row in data set
      * @param reqRows
      *            amount of rows in data set
      */
     public void updateBody(UIDL uidl, int firstRow, int reqRows) {
         int oldIndent = scrollBody.getMaxIndent();
         if (uidl == null || reqRows < 1) {
             // container is empty, remove possibly existing rows
             if (firstRow <= 0) {
                 postponeSanityCheckForLastRendered = true;
                 while (scrollBody.getLastRendered() > scrollBody
                         .getFirstRendered()) {
                     scrollBody.unlinkRow(false);
                 }
                 postponeSanityCheckForLastRendered = false;
                 scrollBody.unlinkRow(false);
             }
             return;
         }
 
         scrollBody.renderRows(uidl, firstRow, reqRows);
 
         discardRowsOutsideCacheWindow();
         scrollBody.calculateMaxIndent();
         if (oldIndent != scrollBody.getMaxIndent()) {
             // indent updated, headers might need adjusting
             headerChangedDuringUpdate = true;
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateRowsInBody(UIDL partialRowUpdates) {
         if (partialRowUpdates == null) {
             return;
         }
         int firstRowIx = partialRowUpdates.getIntAttribute("firsturowix");
         int count = partialRowUpdates.getIntAttribute("numurows");
         scrollBody.unlinkRows(firstRowIx, count);
         scrollBody.insertRows(partialRowUpdates, firstRowIx, count);
     }
 
     /**
      * Updates the internal cache by unlinking rows that fall outside of the
      * caching window.
      */
     protected void discardRowsOutsideCacheWindow() {
         int firstRowToKeep = (int) (firstRowInViewPort - pageLength
                 * cache_rate);
         int lastRowToKeep = (int) (firstRowInViewPort + pageLength + pageLength
                 * cache_rate);
         // sanity checks:
         if (firstRowToKeep < 0) {
             firstRowToKeep = 0;
         }
         if (lastRowToKeep > totalRows) {
             lastRowToKeep = totalRows - 1;
         }
         debug("Client side calculated cache rows to keep: " + firstRowToKeep
                 + "-" + lastRowToKeep);
 
         if (serverCacheFirst != -1) {
             firstRowToKeep = serverCacheFirst;
             lastRowToKeep = serverCacheLast;
             debug("Server cache rows that override: " + serverCacheFirst + "-"
                     + serverCacheLast);
             if (firstRowToKeep < scrollBody.getFirstRendered()
                     || lastRowToKeep > scrollBody.getLastRendered()) {
                 debug("*** Server wants us to keep " + serverCacheFirst + "-"
                         + serverCacheLast + " but we only have rows "
                         + scrollBody.getFirstRendered() + "-"
                         + scrollBody.getLastRendered() + " rendered!");
             }
         }
         discardRowsOutsideOf(firstRowToKeep, lastRowToKeep);
 
         scrollBody.fixSpacers();
 
         scrollBody.restoreRowVisibility();
     }
 
     private void discardRowsOutsideOf(int optimalFirstRow, int optimalLastRow) {
         /*
          * firstDiscarded and lastDiscarded are only calculated for debug
          * purposes
          */
         int firstDiscarded = -1, lastDiscarded = -1;
         boolean cont = true;
         while (cont && scrollBody.getLastRendered() > optimalFirstRow
                 && scrollBody.getFirstRendered() < optimalFirstRow) {
             if (firstDiscarded == -1) {
                 firstDiscarded = scrollBody.getFirstRendered();
             }
 
             // removing row from start
             cont = scrollBody.unlinkRow(true);
         }
         if (firstDiscarded != -1) {
             lastDiscarded = scrollBody.getFirstRendered() - 1;
             debug("Discarded rows " + firstDiscarded + "-" + lastDiscarded);
         }
         firstDiscarded = lastDiscarded = -1;
 
         cont = true;
         while (cont && scrollBody.getLastRendered() > optimalLastRow) {
             if (lastDiscarded == -1) {
                 lastDiscarded = scrollBody.getLastRendered();
             }
 
             // removing row from the end
             cont = scrollBody.unlinkRow(false);
         }
         if (lastDiscarded != -1) {
             firstDiscarded = scrollBody.getLastRendered() + 1;
             debug("Discarded rows " + firstDiscarded + "-" + lastDiscarded);
         }
 
         debug("Now in cache: " + scrollBody.getFirstRendered() + "-"
                 + scrollBody.getLastRendered());
     }
 
     /**
      * Inserts rows in the table body or removes them from the table body based
      * on the commands in the UIDL.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      * 
      * @param partialRowAdditions
      *            the UIDL containing row updates.
      */
     public void addAndRemoveRows(UIDL partialRowAdditions) {
         if (partialRowAdditions == null) {
             return;
         }
         if (partialRowAdditions.hasAttribute("hide")) {
             scrollBody.unlinkAndReindexRows(
                     partialRowAdditions.getIntAttribute("firstprowix"),
                     partialRowAdditions.getIntAttribute("numprows"));
             scrollBody.ensureCacheFilled();
         } else {
             if (partialRowAdditions.hasAttribute("delbelow")) {
                 scrollBody.insertRowsDeleteBelow(partialRowAdditions,
                         partialRowAdditions.getIntAttribute("firstprowix"),
                         partialRowAdditions.getIntAttribute("numprows"));
             } else {
                 scrollBody.insertAndReindexRows(partialRowAdditions,
                         partialRowAdditions.getIntAttribute("firstprowix"),
                         partialRowAdditions.getIntAttribute("numprows"));
             }
         }
 
         discardRowsOutsideCacheWindow();
     }
 
     /**
      * Gives correct column index for given column key ("cid" in UIDL).
      * 
      * @param colKey
      * @return column index of visible columns, -1 if column not visible
      */
     private int getColIndexByKey(String colKey) {
         // return 0 if asked for rowHeaders
         if (ROW_HEADER_COLUMN_KEY.equals(colKey)) {
             return 0;
         }
         for (int i = 0; i < visibleColOrder.length; i++) {
             if (visibleColOrder[i].equals(colKey)) {
                 return i;
             }
         }
         return -1;
     }
 
     protected boolean isMultiSelectModeSimple() {
         return selectMode == SelectMode.MULTI
                 && multiselectmode == MULTISELECT_MODE_SIMPLE;
     }
 
     protected boolean isSingleSelectMode() {
         return selectMode == SelectMode.SINGLE;
     }
 
     protected boolean isMultiSelectModeAny() {
         return selectMode == SelectMode.MULTI;
     }
 
     protected boolean isMultiSelectModeDefault() {
         return selectMode == SelectMode.MULTI
                 && multiselectmode == MULTISELECT_MODE_DEFAULT;
     }
 
     protected void setMultiSelectMode(int multiselectmode) {
         if (BrowserInfo.get().isTouchDevice()) {
             // Always use the simple mode for touch devices that do not have
             // shift/ctrl keys
             this.multiselectmode = MULTISELECT_MODE_SIMPLE;
         } else {
             this.multiselectmode = multiselectmode;
         }
 
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean isSelectable() {
         return selectMode.getId() > SelectMode.NONE.getId();
     }
 
     private boolean isCollapsedColumn(String colKey) {
         if (collapsedColumns == null) {
             return false;
         }
         if (collapsedColumns.contains(colKey)) {
             return true;
         }
         return false;
     }
 
     private String getColKeyByIndex(int index) {
         return tHead.getHeaderCell(index).getColKey();
     }
 
     /**
      * Note: not part of the official API, extend at your own risk. May be
      * removed or replaced in the future.
      * 
      * Sets the indicated column's width for headers and scrollBody alike.
      * 
      * @param colIndex
      *            index of the modified column
      * @param w
      *            new width (may be subject to modifications if doesn't meet
      *            minimum requirements)
      * @param isDefinedWidth
      *            disables expand ratio if set true
      */
     protected void setColWidth(int colIndex, int w, boolean isDefinedWidth) {
         final HeaderCell hcell = tHead.getHeaderCell(colIndex);
 
         // Make sure that the column grows to accommodate the sort indicator if
         // necessary.
         // get min width with no indent or padding
         int minWidth = hcell.getMinWidth(false, false);
         if (w < minWidth) {
             w = minWidth;
         }
 
         // Set header column width WITHOUT INDENT
         hcell.setWidth(w, isDefinedWidth);
 
         // Set footer column width likewise
         FooterCell fcell = tFoot.getFooterCell(colIndex);
         fcell.setWidth(w, isDefinedWidth);
 
         // Ensure indicators have been taken into account
         tHead.resizeCaptionContainer(hcell);
 
         // Make sure that the body column grows to accommodate the indent if
         // necessary.
         // get min width with indent, no padding
         minWidth = hcell.getMinWidth(true, false);
         if (w < minWidth) {
             w = minWidth;
         }
 
         // Set body column width
         scrollBody.setColWidth(colIndex, w);
     }
 
     private int getColWidth(String colKey) {
         return tHead.getHeaderCell(colKey).getWidthWithIndent();
     }
 
     /**
      * Get a rendered row by its key
      * 
      * @param key
      *            The key to search with
      * @return
      */
     public VScrollTableRow getRenderedRowByKey(String key) {
         if (scrollBody != null) {
             final Iterator<Widget> it = scrollBody.iterator();
             VScrollTableRow r = null;
             while (it.hasNext()) {
                 r = (VScrollTableRow) it.next();
                 if (r.getKey().equals(key)) {
                     return r;
                 }
             }
         }
         return null;
     }
 
     /**
      * Returns the next row to the given row
      * 
      * @param row
      *            The row to calculate from
      * 
      * @return The next row or null if no row exists
      */
     private VScrollTableRow getNextRow(VScrollTableRow row, int offset) {
         final Iterator<Widget> it = scrollBody.iterator();
         VScrollTableRow r = null;
         while (it.hasNext()) {
             r = (VScrollTableRow) it.next();
             if (r == row) {
                 r = null;
                 while (offset >= 0 && it.hasNext()) {
                     r = (VScrollTableRow) it.next();
                     offset--;
                 }
                 return r;
             }
         }
 
         return null;
     }
 
     /**
      * Returns the previous row from the given row
      * 
      * @param row
      *            The row to calculate from
      * @return The previous row or null if no row exists
      */
     private VScrollTableRow getPreviousRow(VScrollTableRow row, int offset) {
         final Iterator<Widget> it = scrollBody.iterator();
         final Iterator<Widget> offsetIt = scrollBody.iterator();
         VScrollTableRow r = null;
         VScrollTableRow prev = null;
         while (it.hasNext()) {
             r = (VScrollTableRow) it.next();
             if (offset < 0) {
                 prev = (VScrollTableRow) offsetIt.next();
             }
             if (r == row) {
                 return prev;
             }
             offset--;
         }
 
         return null;
     }
 
     protected void reOrderColumn(String columnKey, int newIndex) {
 
         final int oldIndex = getColIndexByKey(columnKey);
 
         // Change header order
         tHead.moveCell(oldIndex, newIndex);
 
         // Change body order
         scrollBody.moveCol(oldIndex, newIndex);
 
         // Change footer order
         tFoot.moveCell(oldIndex, newIndex);
 
         /*
          * Build new columnOrder and update it to server Note that columnOrder
          * also contains collapsed columns so we cannot directly build it from
          * cells vector Loop the old columnOrder and append in order to new
          * array unless on moved columnKey. On new index also put the moved key
          * i == index on columnOrder, j == index on newOrder
          */
         final String oldKeyOnNewIndex = visibleColOrder[newIndex];
         if (showRowHeaders) {
             newIndex--; // columnOrder don't have rowHeader
         }
         // add back hidden rows,
         for (int i = 0; i < columnOrder.length; i++) {
             if (columnOrder[i].equals(oldKeyOnNewIndex)) {
                 break; // break loop at target
             }
             if (isCollapsedColumn(columnOrder[i])) {
                 newIndex++;
             }
         }
         // finally we can build the new columnOrder for server
         final String[] newOrder = new String[columnOrder.length];
         for (int i = 0, j = 0; j < newOrder.length; i++) {
             if (j == newIndex) {
                 newOrder[j] = columnKey;
                 j++;
             }
             if (i == columnOrder.length) {
                 break;
             }
             if (columnOrder[i].equals(columnKey)) {
                 continue;
             }
             newOrder[j] = columnOrder[i];
             j++;
         }
         columnOrder = newOrder;
         // also update visibleColumnOrder
         int i = showRowHeaders ? 1 : 0;
         for (int j = 0; j < newOrder.length; j++) {
             final String cid = newOrder[j];
             if (!isCollapsedColumn(cid)) {
                 visibleColOrder[i++] = cid;
             }
         }
         client.updateVariable(paintableId, "columnorder", columnOrder, false);
         if (client.hasEventListeners(this,
                 TableConstants.COLUMN_REORDER_EVENT_ID)) {
             client.sendPendingVariableChanges();
         }
     }
 
     @Override
     protected void onDetach() {
         detachedScrollPosition = scrollBodyPanel.getScrollPosition();
         rowRequestHandler.cancel();
         super.onDetach();
         // ensure that scrollPosElement will be detached
         if (scrollPositionElement != null) {
             final Element parent = DOM.getParent(scrollPositionElement);
             if (parent != null) {
                 DOM.removeChild(parent, scrollPositionElement);
             }
         }
     }
 
     @Override
     public void onAttach() {
         super.onAttach();
         // scrollBodyPanel.setScrollPosition(detachedScrollPosition);
     }
 
     /**
      * Run only once when component is attached and received its initial
      * content. This function:
      * 
      * * Syncs headers and bodys "natural widths and saves the values.
      * 
      * * Sets proper width and height
      * 
      * * Makes deferred request to get some cache rows
      * 
      * For internal use only. May be removed or replaced in the future.
      */
     public void sizeInit() {
         if (!isVisibleInHierarchy()) {
             return;
         }
 
         sizeNeedsInit = false;
 
         scrollBody.setContainerHeight();
 
         /*
          * We will use browsers table rendering algorithm to find proper column
          * widths. If content and header take less space than available, we will
          * divide extra space relatively to each column which has not width set.
          * 
          * Overflow pixels are added to last column.
          */
 
         Iterator<Widget> headCells = tHead.iterator();
         Iterator<Widget> footCells = tFoot.iterator();
         int i = 0;
         int totalExplicitColumnsWidths = 0;
         int total = 0;
         float expandRatioDivider = 0;
 
         final int[] widths = new int[tHead.visibleCells.size()];
 
         tHead.enableBrowserIntelligence();
         tFoot.enableBrowserIntelligence();
 
         int hierarchyColumnIndent = scrollBody != null ? scrollBody
                 .getMaxIndent() : 0;
         HeaderCell hierarchyHeaderWithExpandRatio = null;
 
         // first loop: collect natural widths
         while (headCells.hasNext()) {
             final HeaderCell hCell = (HeaderCell) headCells.next();
             final FooterCell fCell = (FooterCell) footCells.next();
             boolean needsIndent = hierarchyColumnIndent > 0
                     && hCell.isHierarchyColumn();
             int w = hCell.getWidth();
             if (hCell.isDefinedWidth()) {
                 // server has defined column width explicitly
                 if (needsIndent && w < hierarchyColumnIndent) {
                     // hierarchy indent overrides explicitly set width
                     w = hierarchyColumnIndent;
                 }
                 totalExplicitColumnsWidths += w;
             } else {
                 if (hCell.getExpandRatio() > 0) {
                     expandRatioDivider += hCell.getExpandRatio();
                     w = 0;
                     if (needsIndent && w < hierarchyColumnIndent) {
                         hierarchyHeaderWithExpandRatio = hCell;
                         // don't add to widths here, because will be included in
                         // the expand ratio space if there's enough of it
                     }
                 } else {
                     // get and store greater of header width and column width,
                     // and store it as a minimum natural column width (these
                     // already contain the indent if any)
                     int headerWidth = hCell.getNaturalColumnWidth(i);
                     int footerWidth = fCell.getNaturalColumnWidth(i);
                     w = headerWidth > footerWidth ? headerWidth : footerWidth;
                 }
                 hCell.setNaturalMinimumColumnWidth(w);
                 fCell.setNaturalMinimumColumnWidth(w);
             }
             widths[i] = w;
             total += w;
             i++;
         }
         if (hierarchyHeaderWithExpandRatio != null) {
             total += hierarchyColumnIndent;
         }
 
         tHead.disableBrowserIntelligence();
         tFoot.disableBrowserIntelligence();
 
         boolean willHaveScrollbarz = willHaveScrollbars();
 
         // fix "natural" width if width not set
         if (isDynamicWidth()) {
             int w = total;
             w += scrollBody.getCellExtraWidth() * visibleColOrder.length;
             if (willHaveScrollbarz) {
                 w += Util.getNativeScrollbarSize();
             }
             setContentWidth(w);
         }
 
         int availW = scrollBody.getAvailableWidth();
         if (BrowserInfo.get().isIE()) {
             // Hey IE, are you really sure about this?
             availW = scrollBody.getAvailableWidth();
         }
         availW -= scrollBody.getCellExtraWidth() * visibleColOrder.length;
 
         if (willHaveScrollbarz) {
             availW -= Util.getNativeScrollbarSize();
         }
 
         // TODO refactor this code to be the same as in resize timer
 
         if (availW > total) {
             // natural size is smaller than available space
             int extraSpace = availW - total;
             if (hierarchyHeaderWithExpandRatio != null) {
                 /*
                  * add the indent's space back to ensure each column gets an
                  * even share according to the expand ratios (note: if the
                  * allocated space isn't enough for the hierarchy column it
                  * shall be treated like a defined width column and the indent
                  * space gets removed from the extra space again)
                  */
                 extraSpace += hierarchyColumnIndent;
             }
             final int totalWidthR = total - totalExplicitColumnsWidths;
             int checksum = 0;
 
             if (extraSpace == 1) {
                 // We cannot divide one single pixel so we give it the first
                 // undefined column
                 // no need to worry about indent here
                 headCells = tHead.iterator();
                 i = 0;
                 checksum = availW;
                 while (headCells.hasNext()) {
                     HeaderCell hc = (HeaderCell) headCells.next();
                     if (!hc.isDefinedWidth()) {
                         widths[i]++;
                         break;
                     }
                     i++;
                 }
 
             } else if (expandRatioDivider > 0) {
                 boolean setIndentToHierarchyHeader = false;
                 if (hierarchyHeaderWithExpandRatio != null) {
                     // ensure first that the hierarchyColumn gets at least the
                     // space allocated for indent
                     final int newSpace = Math
                             .round((extraSpace * (hierarchyHeaderWithExpandRatio
                                     .getExpandRatio() / expandRatioDivider)));
                     if (newSpace < hierarchyColumnIndent) {
                         // not enough space for indent, remove indent from the
                         // extraSpace again and handle hierarchy column's header
                         // separately
                         setIndentToHierarchyHeader = true;
                         extraSpace -= hierarchyColumnIndent;
                     }
                 }
 
                 // visible columns have some active expand ratios, excess
                 // space is divided according to them
                 headCells = tHead.iterator();
                 i = 0;
                 while (headCells.hasNext()) {
                     HeaderCell hCell = (HeaderCell) headCells.next();
                     if (hCell.getExpandRatio() > 0) {
                         int w = widths[i];
                         if (setIndentToHierarchyHeader
                                 && hierarchyHeaderWithExpandRatio.equals(hCell)) {
                             // hierarchy column's header is no longer part of
                             // the expansion divide and only gets indent
                             w += hierarchyColumnIndent;
                         } else {
                             final int newSpace = Math
                                     .round((extraSpace * (hCell
                                             .getExpandRatio() / expandRatioDivider)));
                             w += newSpace;
                         }
                         widths[i] = w;
                     }
                     checksum += widths[i];
                     i++;
                 }
             } else if (totalWidthR > 0) {
                 // no expand ratios defined, we will share extra space
                 // relatively to "natural widths" among those without
                 // explicit width
                 // no need to worry about indent here, it's already included
                 headCells = tHead.iterator();
                 i = 0;
                 while (headCells.hasNext()) {
                     HeaderCell hCell = (HeaderCell) headCells.next();
                     if (!hCell.isDefinedWidth()) {
                         int w = widths[i];
                         final int newSpace = Math.round((float) extraSpace
                                 * (float) w / totalWidthR);
                         w += newSpace;
                         widths[i] = w;
                     }
                     checksum += widths[i];
                     i++;
                 }
             }
 
             if (extraSpace > 0 && checksum != availW) {
                 /*
                  * There might be in some cases a rounding error of 1px when
                  * extra space is divided so if there is one then we give the
                  * first undefined column 1 more pixel
                  */
                 headCells = tHead.iterator();
                 i = 0;
                 while (headCells.hasNext()) {
                     HeaderCell hc = (HeaderCell) headCells.next();
                     if (!hc.isDefinedWidth()) {
                         widths[i] += availW - checksum;
                         break;
                     }
                     i++;
                 }
             }
 
         } else {
             // body's size will be more than available and scrollbar will appear
         }
 
         // last loop: set possibly modified values or reset if new tBody
         i = 0;
         headCells = tHead.iterator();
         while (headCells.hasNext()) {
             final HeaderCell hCell = (HeaderCell) headCells.next();
             // if (isNewBody || hCell.getWidth() == -1) {
                 final int w = widths[i];
                 setColWidth(i, w, false);
             // }
             i++;
         }
 
         initializedAndAttached = true;
 
         updatePageLength();
 
         /*
          * Fix "natural" height if height is not set. This must be after width
          * fixing so the components' widths have been adjusted.
          */
         if (isDynamicHeight()) {
             /*
              * We must force an update of the row height as this point as it
              * might have been (incorrectly) calculated earlier
              */
 
             /*
              * TreeTable updates stuff in a funky order, so we must set the
              * height as zero here before doing the real update to make it
              * realize that there is no content,
              */
             if (pageLength == totalRows && pageLength == 0) {
                 scrollBody.setHeight("0px");
             }
 
             int bodyHeight;
             if (pageLength == totalRows) {
                 /*
                  * A hack to support variable height rows when paging is off.
                  * Generally this is not supported by scrolltable. We want to
                  * show all rows so the bodyHeight should be equal to the table
                  * height.
                  */
                 // int bodyHeight = scrollBody.getOffsetHeight();
                 bodyHeight = scrollBody.getRequiredHeight();
             } else {
                 bodyHeight = (int) Math.round(scrollBody.getRowHeight(true)
                         * pageLength);
             }
             boolean needsSpaceForHorizontalSrollbar = (total > availW);
             if (needsSpaceForHorizontalSrollbar) {
                 bodyHeight += Util.getNativeScrollbarSize();
             }
             scrollBodyPanel.setHeight(bodyHeight + "px");
             Util.runWebkitOverflowAutoFix(scrollBodyPanel.getElement());
         }
 
         isNewBody = false;
 
         if (firstvisible > 0) {
             Scheduler.get().scheduleDeferred(lazyScroller);
         }
 
         if (enabled) {
             // Do we need cache rows
             if (scrollBody.getLastRendered() + 1 < firstRowInViewPort
                     + pageLength + (int) cache_react_rate * pageLength) {
                 if (totalRows - 1 > scrollBody.getLastRendered()) {
                     // fetch cache rows
                     int firstInNewSet = scrollBody.getLastRendered() + 1;
                     int lastInNewSet = (int) (firstRowInViewPort + pageLength + cache_rate
                             * pageLength);
                     if (lastInNewSet > totalRows - 1) {
                         lastInNewSet = totalRows - 1;
                     }
                     rowRequestHandler.triggerRowFetch(firstInNewSet,
                             lastInNewSet - firstInNewSet + 1, 1);
                 }
             }
         }
 
         /*
          * Ensures the column alignments are correct at initial loading. <br/>
          * (child components widths are correct)
          */
         Scheduler.get().scheduleDeferred(new Command() {
 
             @Override
             public void execute() {
                 Util.runWebkitOverflowAutoFix(scrollBodyPanel.getElement());
             }
         });
 
         hadScrollBars = willHaveScrollbarz;
     }
 
     /**
      * Note: this method is not part of official API although declared as
      * protected. Extend at your own risk.
      * 
      * @return true if content area will have scrollbars visible.
      */
     protected boolean willHaveScrollbars() {
         if (isDynamicHeight()) {
             if (pageLength < totalRows) {
                 return true;
             }
         } else {
             int fakeheight = (int) Math.round(scrollBody.getRowHeight()
                     * totalRows);
             int availableHeight = scrollBodyPanel.getElement().getPropertyInt(
                     "clientHeight");
             if (fakeheight > availableHeight) {
                 return true;
             }
         }
         return false;
     }
 
     private void announceScrollPosition() {
         if (scrollPositionElement == null) {
             scrollPositionElement = DOM.createDiv();
             scrollPositionElement.setClassName(getStylePrimaryName()
                     + "-scrollposition");
             scrollPositionElement.getStyle().setPosition(Position.ABSOLUTE);
             scrollPositionElement.getStyle().setDisplay(Display.NONE);
             getElement().appendChild(scrollPositionElement);
         }
 
         Style style = scrollPositionElement.getStyle();
         style.setMarginLeft(getElement().getOffsetWidth() / 2 - 80, Unit.PX);
         style.setMarginTop(-scrollBodyPanel.getOffsetHeight(), Unit.PX);
 
         // indexes go from 1-totalRows, as rowheaders in index-mode indicate
         int last = (firstRowInViewPort + pageLength);
         if (last > totalRows) {
             last = totalRows;
         }
         scrollPositionElement.setInnerHTML("<span>" + (firstRowInViewPort + 1)
                 + " &ndash; " + (last) + "..." + "</span>");
         style.setDisplay(Display.BLOCK);
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void hideScrollPositionAnnotation() {
         if (scrollPositionElement != null) {
             DOM.setStyleAttribute(scrollPositionElement, "display", "none");
         }
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean isScrollPositionVisible() {
         return scrollPositionElement != null
                 && !scrollPositionElement.getStyle().getDisplay()
                         .equals(Display.NONE.toString());
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public class RowRequestHandler extends Timer {
 
         private int reqFirstRow = 0;
         private int reqRows = 0;
         private boolean isRunning = false;
 
         public void triggerRowFetch(int first, int rows) {
             setReqFirstRow(first);
             setReqRows(rows);
             deferRowFetch();
         }
 
         public void triggerRowFetch(int first, int rows, int delay) {
             setReqFirstRow(first);
             setReqRows(rows);
             deferRowFetch(delay);
         }
 
         public void deferRowFetch() {
             deferRowFetch(250);
         }
 
         public boolean isRunning() {
             return isRunning;
         }
 
         public void deferRowFetch(int msec) {
             isRunning = true;
             if (reqRows > 0 && reqFirstRow < totalRows) {
                 schedule(msec);
 
                 // tell scroll position to user if currently "visible" rows are
                 // not rendered
                 if (totalRows > pageLength
                         && ((firstRowInViewPort + pageLength > scrollBody
                                 .getLastRendered()) || (firstRowInViewPort < scrollBody
                                 .getFirstRendered()))) {
                     announceScrollPosition();
                 } else {
                     hideScrollPositionAnnotation();
                 }
             }
         }
 
         public int getReqFirstRow() {
             return reqFirstRow;
         }
 
         public void setReqFirstRow(int reqFirstRow) {
             if (reqFirstRow < 0) {
                 this.reqFirstRow = 0;
             } else if (reqFirstRow >= totalRows) {
                 this.reqFirstRow = totalRows - 1;
             } else {
                 this.reqFirstRow = reqFirstRow;
             }
         }
 
         public void setReqRows(int reqRows) {
             if (reqRows < 0) {
                 this.reqRows = 0;
             } else if (reqFirstRow + reqRows > totalRows) {
                 this.reqRows = totalRows - reqFirstRow;
             } else {
                 this.reqRows = reqRows;
             }
         }
 
         @Override
         public void run() {
             if (client.hasActiveRequest() || navKeyDown) {
                 // if client connection is busy, don't bother loading it more
                 VConsole.log("Postponed rowfetch");
                 schedule(250);
             } else {
 
                 int firstRendered = scrollBody.getFirstRendered();
                 int lastRendered = scrollBody.getLastRendered();
                 if (lastRendered > totalRows) {
                     lastRendered = totalRows - 1;
                 }
                 boolean rendered = firstRendered >= 0 && lastRendered >= 0;
 
                 int firstToBeRendered = firstRendered;
 
                 if (reqFirstRow < firstToBeRendered) {
                     firstToBeRendered = reqFirstRow;
                 } else if (firstRowInViewPort - (int) (cache_rate * pageLength) > firstToBeRendered) {
                     firstToBeRendered = firstRowInViewPort
                             - (int) (cache_rate * pageLength);
                     if (firstToBeRendered < 0) {
                         firstToBeRendered = 0;
                     }
                 } else if (rendered && firstRendered + 1 < reqFirstRow
                         && lastRendered + 1 < reqFirstRow) {
                     // requested rows must fall within the requested rendering
                     // area
                     firstToBeRendered = reqFirstRow;
                 }
                 if (firstToBeRendered + reqRows < firstRendered) {
                     // must increase the required row count accordingly,
                     // otherwise may leave a gap and the rows beyond will get
                     // removed
                     setReqRows(firstRendered - firstToBeRendered);
                 }
 
                 int lastToBeRendered = lastRendered;
                 int lastReqRow = reqFirstRow + reqRows - 1;
 
                 if (lastReqRow > lastToBeRendered) {
                     lastToBeRendered = lastReqRow;
                 } else if (firstRowInViewPort + pageLength + pageLength
                         * cache_rate < lastToBeRendered) {
                     lastToBeRendered = (firstRowInViewPort + pageLength + (int) (pageLength * cache_rate));
                     if (lastToBeRendered >= totalRows) {
                         lastToBeRendered = totalRows - 1;
                     }
                     // due Safari 3.1 bug (see #2607), verify reqrows, original
                     // problem unknown, but this should catch the issue
                     if (lastReqRow > lastToBeRendered) {
                         setReqRows(lastToBeRendered - reqFirstRow);
                     }
                 } else if (rendered && lastRendered - 1 > lastReqRow
                         && firstRendered - 1 > lastReqRow) {
                     // requested rows must fall within the requested rendering
                     // area
                     lastToBeRendered = lastReqRow;
                 }
 
                 if (lastToBeRendered > totalRows) {
                     lastToBeRendered = totalRows - 1;
                 }
                 if (reqFirstRow < firstToBeRendered
                         || (reqFirstRow > firstToBeRendered && (reqFirstRow < firstRendered || reqFirstRow > lastRendered + 1))) {
                     setReqFirstRow(firstToBeRendered);
                 }
                 if (lastRendered < lastToBeRendered
                         && lastRendered + reqRows < lastToBeRendered) {
                     // must increase the required row count accordingly,
                     // otherwise may leave a gap and the rows after will get
                     // removed
                     setReqRows(lastToBeRendered - lastRendered);
                 } else if (lastToBeRendered >= firstRendered
                         && reqFirstRow + reqRows < firstRendered) {
                     setReqRows(lastToBeRendered - lastRendered);
                 }
 
                 client.updateVariable(paintableId, "firstToBeRendered",
                         firstToBeRendered, false);
                 client.updateVariable(paintableId, "lastToBeRendered",
                         lastToBeRendered, false);
 
                 // don't request server to update page first index in case it
                 // has not been changed
                 if (firstRowInViewPort != firstvisible) {
                     // remember which firstvisible we requested, in case the
                     // server has a differing opinion
                     lastRequestedFirstvisible = firstRowInViewPort;
                     client.updateVariable(paintableId, "firstvisible",
                             firstRowInViewPort, false);
                 }
                 client.updateVariable(paintableId, "reqfirstrow", reqFirstRow,
                         false);
                 client.updateVariable(paintableId, "reqrows", reqRows, true);
 
                 if (selectionChanged) {
                     unSyncedselectionsBeforeRowFetch = new HashSet<Object>(
                             selectedRowKeys);
                 }
                 isRunning = false;
             }
         }
 
         /**
          * Sends request to refresh content at this position.
          */
         public void refreshContent() {
             isRunning = true;
             int first = (int) (firstRowInViewPort - pageLength * cache_rate);
             int reqRows = (int) (2 * pageLength * cache_rate + pageLength);
             if (first < 0) {
                 reqRows = reqRows + first;
                 first = 0;
             }
             setReqFirstRow(first);
             setReqRows(reqRows);
             run();
         }
     }
 
     public class HeaderCell extends Widget {
 
         Element td = DOM.createTD();
 
         protected Element captionContainer = DOM.createDiv();
 
         Element sortIndicator = DOM.createDiv();
 
         Element colResizeWidget = DOM.createDiv();
 
         Element floatingCopyOfHeaderCell;
 
         private boolean sortable = false;
         private final String cid;
         private boolean dragging;
 
         private int dragStartX;
         private int colIndex;
         private int originalWidth;
 
         private boolean isResizing;
 
         private int headerX;
 
         private boolean moved;
 
         private int closestSlot;
 
         private int width = -1;
 
         private int naturalWidth = -1;
 
         private char align = ALIGN_LEFT;
 
         boolean definedWidth = false;
 
         private float expandRatio = 0;
 
         private boolean sorted;
 
         public void setSortable(boolean b) {
             sortable = b;
         }
 
         /**
          * Makes room for the sorting indicator in case the column that the
          * header cell belongs to is sorted. This is done by resizing the width
          * of the caption container element by the correct amount
          */
         public void resizeCaptionContainer(int rightSpacing) {
             int captionContainerWidth = width
                     - colResizeWidget.getOffsetWidth() - rightSpacing;
 
             if (td.getClassName().contains("-asc")
                     || td.getClassName().contains("-desc")) {
                 // Leave room for the sort indicator
                 captionContainerWidth -= sortIndicator.getOffsetWidth();
             }
 
             if (captionContainerWidth < 0) {
                 rightSpacing += captionContainerWidth;
                 captionContainerWidth = 0;
             }
 
             captionContainer.getStyle().setPropertyPx("width",
                     captionContainerWidth);
 
             // Apply/Remove spacing if defined
             if (rightSpacing > 0) {
                 colResizeWidget.getStyle().setMarginLeft(rightSpacing, Unit.PX);
             } else {
                 colResizeWidget.getStyle().clearMarginLeft();
             }
         }
 
         public void setNaturalMinimumColumnWidth(int w) {
             naturalWidth = w;
         }
 
         public HeaderCell(String colId, String headerText) {
             cid = colId;
 
             setText(headerText);
 
             td.appendChild(colResizeWidget);
 
             // ensure no clipping initially (problem on column additions)
             captionContainer.getStyle().setOverflow(Overflow.VISIBLE);
 
             td.appendChild(sortIndicator);
             td.appendChild(captionContainer);
 
             DOM.sinkEvents(td, Event.MOUSEEVENTS | Event.ONDBLCLICK
                     | Event.ONCONTEXTMENU | Event.TOUCHEVENTS);
 
             setElement(td);
 
             setAlign(ALIGN_LEFT);
         }
 
         protected void updateStyleNames(String primaryStyleName) {
             colResizeWidget.setClassName(primaryStyleName + "-resizer");
             sortIndicator.setClassName(primaryStyleName + "-sort-indicator");
             captionContainer.setClassName(primaryStyleName
                     + "-caption-container");
             if (sorted) {
                 if (sortAscending) {
                     setStyleName(primaryStyleName + "-header-cell-asc");
                 } else {
                     setStyleName(primaryStyleName + "-header-cell-desc");
                 }
             } else {
                 setStyleName(primaryStyleName + "-header-cell");
             }
 
             final String ALIGN_PREFIX = primaryStyleName
                     + "-caption-container-align-";
 
             switch (align) {
             case ALIGN_CENTER:
                 captionContainer.addClassName(ALIGN_PREFIX + "center");
                 break;
             case ALIGN_RIGHT:
                 captionContainer.addClassName(ALIGN_PREFIX + "right");
                 break;
             default:
                 captionContainer.addClassName(ALIGN_PREFIX + "left");
                 break;
             }
 
         }
 
         public void disableAutoWidthCalculation() {
             definedWidth = true;
             expandRatio = 0;
         }
 
         /**
          * Sets width to the header cell. This width should not include any
          * possible indent modifications that are present in
          * {@link VScrollTableBody#getMaxIndent()}.
          * 
          * @param w
          *            required width of the cell sans indentations
          * @param ensureDefinedWidth
          *            disables expand ratio if required
          */
         public void setWidth(int w, boolean ensureDefinedWidth) {
             if (ensureDefinedWidth) {
                 definedWidth = true;
                 // on column resize expand ratio becomes zero
                 expandRatio = 0;
             }
             if (width == -1) {
                 // go to default mode, clip content if necessary
                 DOM.setStyleAttribute(captionContainer, "overflow", "");
             }
             width = w;
             if (w == -1) {
                 DOM.setStyleAttribute(captionContainer, "width", "");
                 setWidth("");
             } else {
                 tHead.resizeCaptionContainer(this);
 
                 /*
                  * if we already have tBody, set the header width properly, if
                  * not defer it. IE will fail with complex float in table header
                  * unless TD width is not explicitly set.
                  */
                 if (scrollBody != null) {
                     int maxIndent = scrollBody.getMaxIndent();
                     if (w < maxIndent && isHierarchyColumn()) {
                         w = maxIndent;
                     }
                     int tdWidth = w + scrollBody.getCellExtraWidth();
                     setWidth(tdWidth + "px");
                 } else {
                     Scheduler.get().scheduleDeferred(new Command() {
 
                         @Override
                         public void execute() {
                             int maxIndent = scrollBody.getMaxIndent();
                             int tdWidth = width;
                             if (tdWidth < maxIndent && isHierarchyColumn()) {
                                 tdWidth = maxIndent;
                             }
                             tdWidth += scrollBody.getCellExtraWidth();
                             setWidth(tdWidth + "px");
                         }
                     });
                 }
             }
         }
 
         public void setUndefinedWidth() {
             definedWidth = false;
             setWidth(-1, false);
         }
 
         /**
          * Detects if width is fixed by developer on server side or resized to
          * current width by user.
          * 
          * @return true if defined, false if "natural" width
          */
         public boolean isDefinedWidth() {
             return definedWidth && width >= 0;
         }
 
         /**
          * This method exists for the needs of {@link VTreeTable} only.
          * 
          * Returns the pixels width of the header cell. This includes the
          * indent, if applicable.
          * 
          * @return The width in pixels
          */
         protected int getWidthWithIndent() {
             if (scrollBody != null && isHierarchyColumn()) {
                 int maxIndent = scrollBody.getMaxIndent();
                 if (maxIndent > width) {
                     return maxIndent;
                 }
             }
             return width;
         }
 
         /**
          * Returns the pixels width of the header cell.
          * 
          * @return The width in pixels
          */
         public int getWidth() {
             return width;
         }
 
         /**
          * This method exists for the needs of {@link VTreeTable} only.
          * 
          * @return <code>true</code> if this is hierarcyColumn's header cell,
          *         <code>false</code> otherwise
          */
         private boolean isHierarchyColumn() {
             int hierarchyColumnIndex = getHierarchyColumnIndex();
             return hierarchyColumnIndex >= 0
                     && tHead.visibleCells.indexOf(this) == hierarchyColumnIndex;
         }
 
         public void setText(String headerText) {
             DOM.setInnerHTML(captionContainer, headerText);
         }
 
         public String getColKey() {
             return cid;
         }
 
         protected void setSorted(boolean sorted) {
             this.sorted = sorted;
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         /**
          * Handle column reordering.
          */
 
         @Override
         public void onBrowserEvent(Event event) {
             if (enabled && event != null) {
                 if (isResizing
                         || event.getEventTarget().cast() == colResizeWidget) {
                     if (dragging
                             && (event.getTypeInt() == Event.ONMOUSEUP || event
                                     .getTypeInt() == Event.ONTOUCHEND)) {
                         // Handle releasing column header on spacer #5318
                         handleCaptionEvent(event);
                     } else {
                         onResizeEvent(event);
                     }
                 } else {
                     /*
                      * Ensure focus before handling caption event. Otherwise
                      * variables changed from caption event may be before
                      * variables from other components that fire variables when
                      * they lose focus.
                      */
                     if (event.getTypeInt() == Event.ONMOUSEDOWN
                             || event.getTypeInt() == Event.ONTOUCHSTART) {
                         scrollBodyPanel.setFocus(true);
                     }
                     handleCaptionEvent(event);
                     boolean stopPropagation = true;
                     if (event.getTypeInt() == Event.ONCONTEXTMENU
                             && !client.hasEventListeners(VScrollTablePatched.this,
                                     TableConstants.HEADER_CLICK_EVENT_ID)) {
                         // Prevent showing the browser's context menu only when
                         // there is a header click listener.
                         stopPropagation = false;
                     }
                     if (stopPropagation) {
                         event.stopPropagation();
                         event.preventDefault();
                     }
                 }
             }
         }
 
         private void createFloatingCopy() {
             floatingCopyOfHeaderCell = DOM.createDiv();
             DOM.setInnerHTML(floatingCopyOfHeaderCell, DOM.getInnerHTML(td));
             floatingCopyOfHeaderCell = DOM
                     .getChild(floatingCopyOfHeaderCell, 2);
             DOM.setElementProperty(floatingCopyOfHeaderCell, "className",
                     VScrollTablePatched.this.getStylePrimaryName() + "-header-drag");
             // otherwise might wrap or be cut if narrow column
             DOM.setStyleAttribute(floatingCopyOfHeaderCell, "width", "auto");
             updateFloatingCopysPosition(DOM.getAbsoluteLeft(td),
                     DOM.getAbsoluteTop(td));
             DOM.appendChild(RootPanel.get().getElement(),
                     floatingCopyOfHeaderCell);
         }
 
         private void updateFloatingCopysPosition(int x, int y) {
             x -= DOM.getElementPropertyInt(floatingCopyOfHeaderCell,
                     "offsetWidth") / 2;
             DOM.setStyleAttribute(floatingCopyOfHeaderCell, "left", x + "px");
             if (y > 0) {
                 DOM.setStyleAttribute(floatingCopyOfHeaderCell, "top", (y + 7)
                         + "px");
             }
         }
 
         private void hideFloatingCopy() {
             DOM.removeChild(RootPanel.get().getElement(),
                     floatingCopyOfHeaderCell);
             floatingCopyOfHeaderCell = null;
         }
 
         /**
          * Fires a header click event after the user has clicked a column header
          * cell
          * 
          * @param event
          *            The click event
          */
         private void fireHeaderClickedEvent(Event event) {
             if (client.hasEventListeners(VScrollTablePatched.this,
                     TableConstants.HEADER_CLICK_EVENT_ID)) {
                 MouseEventDetails details = MouseEventDetailsBuilder
                         .buildMouseEventDetails(event);
                 client.updateVariable(paintableId, "headerClickEvent",
                         details.toString(), false);
                 client.updateVariable(paintableId, "headerClickCID", cid, true);
             }
         }
 
         protected void handleCaptionEvent(Event event) {
             switch (DOM.eventGetType(event)) {
             case Event.ONTOUCHSTART:
             case Event.ONMOUSEDOWN:
                 if (columnReordering
                         && Util.isTouchEventOrLeftMouseButton(event)) {
                     if (event.getTypeInt() == Event.ONTOUCHSTART) {
                         /*
                          * prevent using this event in e.g. scrolling
                          */
                         event.stopPropagation();
                     }
                     dragging = true;
                     moved = false;
                     colIndex = getColIndexByKey(cid);
                     DOM.setCapture(getElement());
                     headerX = tHead.getAbsoluteLeft();
                     event.preventDefault(); // prevent selecting text &&
                                             // generated touch events
                 }
                 break;
             case Event.ONMOUSEUP:
             case Event.ONTOUCHEND:
             case Event.ONTOUCHCANCEL:
                 if (columnReordering
                         && Util.isTouchEventOrLeftMouseButton(event)) {
                     dragging = false;
                     DOM.releaseCapture(getElement());
                     if (moved) {
                         hideFloatingCopy();
                         tHead.removeSlotFocus();
                         if (closestSlot != colIndex
                                 && closestSlot != (colIndex + 1)) {
                             if (closestSlot > colIndex) {
                                 reOrderColumn(cid, closestSlot - 1);
                             } else {
                                 reOrderColumn(cid, closestSlot);
                             }
                         }
                     }
                     if (Util.isTouchEvent(event)) {
                         /*
                          * Prevent using in e.g. scrolling and prevent generated
                          * events.
                          */
                         event.preventDefault();
                         event.stopPropagation();
                     }
                 }
 
                 if (!moved) {
                     // mouse event was a click to header -> sort column
                     if (sortable && Util.isTouchEventOrLeftMouseButton(event)) {
                         if (sortColumn.equals(cid)) {
                             // just toggle order
                             client.updateVariable(paintableId, "sortascending",
                                     !sortAscending, false);
                         } else {
                             // set table sorted by this column
                             client.updateVariable(paintableId, "sortcolumn",
                                     cid, false);
                         }
                         // get also cache columns at the same request
                         scrollBodyPanel.setScrollPosition(0);
                         firstvisible = 0;
                         rowRequestHandler.setReqFirstRow(0);
                         rowRequestHandler.setReqRows((int) (2 * pageLength
                                 * cache_rate + pageLength));
                         rowRequestHandler.deferRowFetch(); // some validation +
                                                            // defer 250ms
                         rowRequestHandler.cancel(); // instead of waiting
                         rowRequestHandler.run(); // run immediately
                     }
                     fireHeaderClickedEvent(event);
                     if (Util.isTouchEvent(event)) {
                         /*
                          * Prevent using in e.g. scrolling and prevent generated
                          * events.
                          */
                         event.preventDefault();
                         event.stopPropagation();
                     }
                     break;
                 }
                 break;
             case Event.ONDBLCLICK:
                 fireHeaderClickedEvent(event);
                 break;
             case Event.ONTOUCHMOVE:
             case Event.ONMOUSEMOVE:
                 if (dragging && Util.isTouchEventOrLeftMouseButton(event)) {
                     if (event.getTypeInt() == Event.ONTOUCHMOVE) {
                         /*
                          * prevent using this event in e.g. scrolling
                          */
                         event.stopPropagation();
                     }
                     if (!moved) {
                         createFloatingCopy();
                         moved = true;
                     }
 
                     final int clientX = Util.getTouchOrMouseClientX(event);
                     final int x = clientX + tHead.hTableWrapper.getScrollLeft();
                     int slotX = headerX;
                     closestSlot = colIndex;
                     int closestDistance = -1;
                     int start = 0;
                     if (showRowHeaders) {
                         start++;
                     }
                     final int visibleCellCount = tHead.getVisibleCellCount();
                     for (int i = start; i <= visibleCellCount; i++) {
                         if (i > 0) {
                             final String colKey = getColKeyByIndex(i - 1);
                             // getColWidth only returns the internal width
                             // without padding, not the offset width of the
                             // whole td (#10890)
                             slotX += getColWidth(colKey)
                                     + scrollBody.getCellExtraWidth();
                         }
                         final int dist = Math.abs(x - slotX);
                         if (closestDistance == -1 || dist < closestDistance) {
                             closestDistance = dist;
                             closestSlot = i;
                         }
                     }
                     tHead.focusSlot(closestSlot);
 
                     updateFloatingCopysPosition(clientX, -1);
                 }
                 break;
             default:
                 break;
             }
         }
 
         private void onResizeEvent(Event event) {
             switch (DOM.eventGetType(event)) {
             case Event.ONMOUSEDOWN:
                 if (!Util.isTouchEventOrLeftMouseButton(event)) {
                     return;
                 }
                 isResizing = true;
                 DOM.setCapture(getElement());
                 dragStartX = DOM.eventGetClientX(event);
                 colIndex = getColIndexByKey(cid);
                 originalWidth = getWidthWithIndent();
                 DOM.eventPreventDefault(event);
                 break;
             case Event.ONMOUSEUP:
                 if (!Util.isTouchEventOrLeftMouseButton(event)) {
                     return;
                 }
                 isResizing = false;
                 DOM.releaseCapture(getElement());
                 tHead.disableAutoColumnWidthCalculation(this);
 
                 // Ensure last header cell is taking into account possible
                 // column selector
                 HeaderCell lastCell = tHead.getHeaderCell(tHead
                         .getVisibleCellCount() - 1);
                 tHead.resizeCaptionContainer(lastCell);
                 triggerLazyColumnAdjustment(true);
 
                 fireColumnResizeEvent(cid, originalWidth, getColWidth(cid));
                 break;
             case Event.ONMOUSEMOVE:
                 if (!Util.isTouchEventOrLeftMouseButton(event)) {
                     return;
                 }
                 if (isResizing) {
                     final int deltaX = DOM.eventGetClientX(event) - dragStartX;
                     if (deltaX == 0) {
                         return;
                     }
                     tHead.disableAutoColumnWidthCalculation(this);
 
                     int newWidth = originalWidth + deltaX;
                     // get min width with indent, no padding
                     int minWidth = getMinWidth(true, false);
                     if (newWidth < minWidth) {
                         // already includes indent if any
                         newWidth = minWidth;
                     }
                     setColWidth(colIndex, newWidth, true);
                     triggerLazyColumnAdjustment(false);
                     forceRealignColumnHeaders();
                 }
                 break;
             default:
                 break;
             }
         }
 
         /**
          * Returns the smallest possible cell width in pixels.
          * 
          * @param includeIndent
          *            - width should include hierarchy column indent if
          *            applicable (VTreeTable only)
          * @param includeCellExtraWidth
          *            - width should include paddings etc.
          * @return
          */
         private int getMinWidth(boolean includeIndent,
                 boolean includeCellExtraWidth) {
             int minWidth = sortIndicator.getOffsetWidth();
             if (scrollBody != null) {
                 // check the need for indent before adding paddings etc.
                 if (includeIndent && isHierarchyColumn()) {
                     int maxIndent = scrollBody.getMaxIndent();
                     if (minWidth < maxIndent) {
                         minWidth = maxIndent;
                     }
                 }
                 if (includeCellExtraWidth) {
                     minWidth += scrollBody.getCellExtraWidth();
                 }
             }
             return minWidth;
         }
 
         public int getMinWidth() {
             // get min width with padding, no indent
             return getMinWidth(false, true);
         }
 
         public String getCaption() {
             return DOM.getInnerText(captionContainer);
         }
 
         public boolean isEnabled() {
             return getParent() != null;
         }
 
         public void setAlign(char c) {
             align = c;
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         public char getAlign() {
             return align;
         }
 
         /**
          * Detects the natural minimum width for the column of this header cell.
          * If column is resized by user or the width is defined by server the
          * actual width is returned. Else the natural min width is returned.
          * 
          * @param columnIndex
          *            column index hint, if -1 (unknown) it will be detected
          * 
          * @return
          */
         public int getNaturalColumnWidth(int columnIndex) {
             final int iw = columnIndex == getHierarchyColumnIndex() ? scrollBody
                     .getMaxIndent() : 0;
             if (isDefinedWidth()) {
                 if (iw > width) {
                     return iw;
                 }
                 return width;
             } else {
                 if (naturalWidth < 0) {
                     // This is recently revealed column. Try to detect a proper
                     // value (greater of header and data columns)
 
                     int hw = captionContainer.getOffsetWidth()
                             + getHeaderPadding();
                     if (BrowserInfo.get().isGecko()) {
                         hw += sortIndicator.getOffsetWidth();
                     }
                     if (columnIndex < 0) {
                         columnIndex = 0;
                         for (Iterator<Widget> it = tHead.iterator(); it
                                 .hasNext(); columnIndex++) {
                             if (it.next() == this) {
                                 break;
                             }
                         }
                     }
                     final int cw = scrollBody.getColWidth(columnIndex);
                     naturalWidth = (hw > cw ? hw : cw);
                 }
                 if (iw > naturalWidth) {
                     // indent is temporary value, naturalWidth shouldn't be
                     // updated
                     return iw;
                 } else {
                     return naturalWidth;
                 }
             }
         }
 
         public void setExpandRatio(float floatAttribute) {
             if (floatAttribute != expandRatio) {
                 triggerLazyColumnAdjustment(false);
             }
             expandRatio = floatAttribute;
         }
 
         public float getExpandRatio() {
             return expandRatio;
         }
 
         public boolean isSorted() {
             return sorted;
         }
     }
 
     /**
      * HeaderCell that is header cell for row headers.
      * 
      * Reordering disabled and clicking on it resets sorting.
      */
     public class RowHeadersHeaderCell extends HeaderCell {
 
         RowHeadersHeaderCell() {
             super(ROW_HEADER_COLUMN_KEY, "");
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         @Override
         protected void updateStyleNames(String primaryStyleName) {
             super.updateStyleNames(primaryStyleName);
             setStyleName(primaryStyleName + "-header-cell-rowheader");
         }
 
         @Override
         protected void handleCaptionEvent(Event event) {
             // NOP: RowHeaders cannot be reordered
             // TODO It'd be nice to reset sorting here
         }
     }
 
     public class TableHead extends Panel implements ActionOwner {
 
         private static final int WRAPPER_WIDTH = 900000;
 
         ArrayList<Widget> visibleCells = new ArrayList<Widget>();
 
         HashMap<String, HeaderCell> availableCells = new HashMap<String, HeaderCell>();
 
         protected Element div = DOM.createDiv();
         Element hTableWrapper = DOM.createDiv();
         Element hTableContainer = DOM.createDiv();
         Element table = DOM.createTable();
         Element headerTableBody = DOM.createTBody();
         Element tr = DOM.createTR();
 
         private final Element columnSelector = DOM.createDiv();
 
         private int focusedSlot = -1;
 
         public TableHead() {
             if (BrowserInfo.get().isIE()) {
                 table.setPropertyInt("cellSpacing", 0);
             }
 
             DOM.setStyleAttribute(hTableWrapper, "overflow", "hidden");
             DOM.setStyleAttribute(columnSelector, "display", "none");
 
             DOM.appendChild(table, headerTableBody);
             DOM.appendChild(headerTableBody, tr);
             DOM.appendChild(hTableContainer, table);
             DOM.appendChild(hTableWrapper, hTableContainer);
             DOM.appendChild(div, hTableWrapper);
             DOM.appendChild(div, columnSelector);
             setElement(div);
 
             DOM.sinkEvents(columnSelector, Event.ONCLICK);
 
             availableCells.put(ROW_HEADER_COLUMN_KEY,
                     new RowHeadersHeaderCell());
         }
 
         protected void updateStyleNames(String primaryStyleName) {
             hTableWrapper.setClassName(primaryStyleName + "-header");
             columnSelector.setClassName(primaryStyleName + "-column-selector");
             setStyleName(primaryStyleName + "-header-wrap");
             for (HeaderCell c : availableCells.values()) {
                 c.updateStyleNames(primaryStyleName);
             }
         }
 
         public void resizeCaptionContainer(HeaderCell cell) {
             HeaderCell lastcell = getHeaderCell(visibleCells.size() - 1);
             int columnSelectorOffset = columnSelector.getOffsetWidth();
 
             if (cell == lastcell && columnSelectorOffset > 0
                     && !hasVerticalScrollbar()) {
 
                 // Measure column widths
                 int columnTotalWidth = 0;
                 for (Widget w : visibleCells) {
                     int cellExtraWidth = w.getOffsetWidth();
                     if (scrollBody != null
                             && visibleCells.indexOf(w) == getHierarchyColumnIndex()
                             && cellExtraWidth < scrollBody.getMaxIndent()) {
                         // indent must be taken into consideration even if it
                         // hasn't been applied yet
                         columnTotalWidth += scrollBody.getMaxIndent();
                     } else {
                         columnTotalWidth += cellExtraWidth;
                     }
                 }
 
                 int divOffset = div.getOffsetWidth();
                 if (columnTotalWidth >= divOffset - columnSelectorOffset) {
                     /*
                      * Ensure column caption is visible when placed under the
                      * column selector widget by shifting and resizing the
                      * caption.
                      */
                     int offset = 0;
                     int diff = divOffset - columnTotalWidth;
                     if (diff < columnSelectorOffset && diff > 0) {
                         /*
                          * If the difference is less than the column selectors
                          * width then just offset by the difference
                          */
                         offset = columnSelectorOffset - diff;
                     } else {
                         // Else offset by the whole column selector
                         offset = columnSelectorOffset;
                     }
                     lastcell.resizeCaptionContainer(offset);
                 } else {
                     cell.resizeCaptionContainer(0);
                 }
             } else {
                 cell.resizeCaptionContainer(0);
             }
         }
 
         @Override
         public void clear() {
             for (String cid : availableCells.keySet()) {
                 removeCell(cid);
             }
             availableCells.clear();
             availableCells.put(ROW_HEADER_COLUMN_KEY,
                     new RowHeadersHeaderCell());
         }
 
         public void updateCellsFromUIDL(UIDL uidl) {
             Iterator<?> it = uidl.getChildIterator();
             HashSet<String> updated = new HashSet<String>();
             boolean refreshContentWidths = initializedAndAttached
                     && hadScrollBars != willHaveScrollbars();
             while (it.hasNext()) {
                 final UIDL col = (UIDL) it.next();
                 final String cid = col.getStringAttribute("cid");
                 updated.add(cid);
 
                 String caption = buildCaptionHtmlSnippet(col);
                 HeaderCell c = getHeaderCell(cid);
                 if (c == null) {
                     c = createHeaderCell(cid, caption);
                     availableCells.put(cid, c);
                     if (initializedAndAttached) {
                         // we will need a column width recalculation
                         initializedAndAttached = false;
                         initialContentReceived = false;
                         isNewBody = true;
                     }
                 } else {
                     c.setText(caption);
                 }
 
                 if (col.hasAttribute("sortable")) {
                     c.setSortable(true);
                     if (cid.equals(sortColumn)) {
                         c.setSorted(true);
                     } else {
                         c.setSorted(false);
                     }
                 } else {
                     c.setSortable(false);
                 }
 
                 if (col.hasAttribute("align")) {
                     c.setAlign(col.getStringAttribute("align").charAt(0));
                 } else {
                     c.setAlign(ALIGN_LEFT);
 
                 }
                 if (col.hasAttribute("width")) {
                     // Make sure to accomodate for the sort indicator if
                     // necessary.
                     int width = col.getIntAttribute("width");
                     int widthWithoutAddedIndent = width;
 
                     // get min width with indent, no padding
                     int minWidth = c.getMinWidth(true, false);
                     if (width < minWidth) {
                         width = minWidth;
                     }
                     if (scrollBody != null && width != c.getWidthWithIndent()) {
                         // Do a more thorough update if a column is resized from
                         // the server *after* the header has been properly
                         // initialized
                         final int colIx = getColIndexByKey(c.cid);
                         final int newWidth = width;
                         Scheduler.get().scheduleDeferred(
                                 new ScheduledCommand() {
 
                                     @Override
                                     public void execute() {
                                         setColWidth(colIx, newWidth, true);
                                     }
                                 });
                         refreshContentWidths = true;
                     } else {
                         // get min width with no indent or padding
                         minWidth = c.getMinWidth(false, false);
                         if (widthWithoutAddedIndent < minWidth) {
                             widthWithoutAddedIndent = minWidth;
                         }
                         // save min width without indent
                         c.setWidth(widthWithoutAddedIndent, true);
                     }
                 } else if (col.hasAttribute("er")) {
                     c.setExpandRatio(col.getFloatAttribute("er"));
 
                 } else if (recalcWidths) {
                     c.setUndefinedWidth();
 
                 } else {
                     boolean hadExpandRatio = c.getExpandRatio() > 0;
                     boolean hadDefinedWidth = c.isDefinedWidth();
                     if (hadExpandRatio || hadDefinedWidth) {
                         // Someone has removed a expand width or the defined
                         // width on the server side (setting it to -1), make the
                         // column undefined again and measure columns again.
                         c.setUndefinedWidth();
                         c.setExpandRatio(0);
                         refreshContentWidths = true;
                     }
                 }
 
                 if (col.hasAttribute("collapsed")) {
                     // ensure header is properly removed from parent (case when
                     // collapsing happens via servers side api)
                     if (c.isAttached()) {
                         c.removeFromParent();
                         headerChangedDuringUpdate = true;
                     }
                 }
             }
 
             if (refreshContentWidths) {
                 // Recalculate the column sizings if any column has changed
                 Scheduler.get().scheduleDeferred(new ScheduledCommand() {
 
                     @Override
                     public void execute() {
                         triggerLazyColumnAdjustment(true);
                     }
                 });
             }
 
             // check for orphaned header cells
             for (Iterator<String> cit = availableCells.keySet().iterator(); cit
                     .hasNext();) {
                 String cid = cit.next();
                 if (!updated.contains(cid)) {
                     removeCell(cid);
                     cit.remove();
                     // we will need a column width recalculation, since columns
                     // with expand ratios should expand to fill the void.
                     initializedAndAttached = false;
                     initialContentReceived = false;
                     isNewBody = true;
                 }
             }
         }
 
         public void enableColumn(String cid, int index) {
             final HeaderCell c = getHeaderCell(cid);
             if (!c.isEnabled() || getHeaderCell(index) != c) {
                 setHeaderCell(index, c);
                 if (initializedAndAttached) {
                     headerChangedDuringUpdate = true;
                 }
             }
         }
 
         public int getVisibleCellCount() {
             return visibleCells.size();
         }
 
         public void setHorizontalScrollPosition(int scrollLeft) {
             hTableWrapper.setScrollLeft(scrollLeft);
         }
 
         public void setColumnCollapsingAllowed(boolean cc) {
             if (cc) {
                 columnSelector.getStyle().setDisplay(Display.BLOCK);
             } else {
                 columnSelector.getStyle().setDisplay(Display.NONE);
             }
         }
 
         public void disableBrowserIntelligence() {
             hTableContainer.getStyle().setWidth(WRAPPER_WIDTH, Unit.PX);
         }
 
         public void enableBrowserIntelligence() {
             hTableContainer.getStyle().clearWidth();
         }
 
         public void setHeaderCell(int index, HeaderCell cell) {
             if (cell.isEnabled()) {
                 // we're moving the cell
                 DOM.removeChild(tr, cell.getElement());
                 orphan(cell);
                 visibleCells.remove(cell);
             }
             if (index < visibleCells.size()) {
                 // insert to right slot
                 DOM.insertChild(tr, cell.getElement(), index);
                 adopt(cell);
                 visibleCells.add(index, cell);
             } else if (index == visibleCells.size()) {
                 // simply append
                 DOM.appendChild(tr, cell.getElement());
                 adopt(cell);
                 visibleCells.add(cell);
             } else {
                 throw new RuntimeException(
                         "Header cells must be appended in order");
             }
         }
 
         public HeaderCell getHeaderCell(int index) {
             if (index >= 0 && index < visibleCells.size()) {
                 return (HeaderCell) visibleCells.get(index);
             } else {
                 return null;
             }
         }
 
         /**
          * Get's HeaderCell by it's column Key.
          * 
          * Note that this returns HeaderCell even if it is currently collapsed.
          * 
          * @param cid
          *            Column key of accessed HeaderCell
          * @return HeaderCell
          */
         public HeaderCell getHeaderCell(String cid) {
             return availableCells.get(cid);
         }
 
         public void moveCell(int oldIndex, int newIndex) {
             final HeaderCell hCell = getHeaderCell(oldIndex);
             final Element cell = hCell.getElement();
 
             visibleCells.remove(oldIndex);
             DOM.removeChild(tr, cell);
 
             DOM.insertChild(tr, cell, newIndex);
             visibleCells.add(newIndex, hCell);
         }
 
         @Override
         public Iterator<Widget> iterator() {
             return visibleCells.iterator();
         }
 
         @Override
         public boolean remove(Widget w) {
             if (visibleCells.contains(w)) {
                 visibleCells.remove(w);
                 orphan(w);
                 DOM.removeChild(DOM.getParent(w.getElement()), w.getElement());
                 return true;
             }
             return false;
         }
 
         public void removeCell(String colKey) {
             final HeaderCell c = getHeaderCell(colKey);
             remove(c);
         }
 
         private void focusSlot(int index) {
             removeSlotFocus();
             if (index > 0) {
                 Element child = tr.getChild(index - 1).getFirstChild().cast();
                 child.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-resizer");
                 child.addClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-focus-slot-right");
             } else {
                 Element child = tr.getChild(index).getFirstChild().cast();
                 child.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-resizer");
                 child.addClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-focus-slot-left");
             }
             focusedSlot = index;
         }
 
         private void removeSlotFocus() {
             if (focusedSlot < 0) {
                 return;
             }
             if (focusedSlot == 0) {
                 Element child = tr.getChild(focusedSlot).getFirstChild().cast();
                 child.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-resizer");
             } else if (focusedSlot > 0) {
                 Element child = tr.getChild(focusedSlot - 1).getFirstChild()
                         .cast();
                 child.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-resizer");
             }
             focusedSlot = -1;
         }
 
         @Override
         public void onBrowserEvent(Event event) {
             if (enabled) {
                 if (event.getEventTarget().cast() == columnSelector) {
                     final int left = DOM.getAbsoluteLeft(columnSelector);
                     final int top = DOM.getAbsoluteTop(columnSelector)
                             + DOM.getElementPropertyInt(columnSelector,
                                     "offsetHeight");
                     client.getContextMenu().showAt(this, left, top);
                 }
             }
         }
 
         @Override
         protected void onDetach() {
             super.onDetach();
             if (client != null) {
                 client.getContextMenu().ensureHidden(this);
             }
         }
 
         class VisibleColumnAction extends Action {
 
             String colKey;
             private boolean collapsed;
             private boolean noncollapsible = false;
             private VScrollTableRow currentlyFocusedRow;
 
             public VisibleColumnAction(String colKey) {
                 super(VScrollTablePatched.TableHead.this);
                 this.colKey = colKey;
                 caption = tHead.getHeaderCell(colKey).getCaption();
                 currentlyFocusedRow = focusedRow;
             }
 
             @Override
             public void execute() {
                 if (noncollapsible) {
                     return;
                 }
                 client.getContextMenu().hide();
                 // toggle selected column
                 if (collapsedColumns.contains(colKey)) {
                     collapsedColumns.remove(colKey);
                 } else {
                     tHead.removeCell(colKey);
                     collapsedColumns.add(colKey);
                     triggerLazyColumnAdjustment(true);
                 }
 
                 // update variable to server
                 client.updateVariable(paintableId, "collapsedcolumns",
                         collapsedColumns.toArray(new String[collapsedColumns
                                 .size()]), false);
                 // let rowRequestHandler determine proper rows
                 rowRequestHandler.refreshContent();
                 lazyRevertFocusToRow(currentlyFocusedRow);
             }
 
             public void setCollapsed(boolean b) {
                 collapsed = b;
             }
 
             public void setNoncollapsible(boolean b) {
                 noncollapsible = b;
             }
 
             /**
              * Override default method to distinguish on/off columns
              */
 
             @Override
             public String getHTML() {
                 final StringBuffer buf = new StringBuffer();
                 buf.append("<span class=\"");
                 if (collapsed) {
                     buf.append("v-off");
                 } else {
                     buf.append("v-on");
                 }
                 if (noncollapsible) {
                     buf.append(" v-disabled");
                 }
                 buf.append("\">");
 
                 buf.append(super.getHTML());
                 buf.append("</span>");
 
                 return buf.toString();
             }
 
         }
 
         /*
          * Returns columns as Action array for column select popup
          */
 
         @Override
         public Action[] getActions() {
             Object[] cols;
             if (columnReordering && columnOrder != null) {
                 cols = columnOrder;
             } else {
                 // if columnReordering is disabled, we need different way to get
                 // all available columns
                 cols = visibleColOrder;
                 cols = new Object[visibleColOrder.length
                         + collapsedColumns.size()];
                 int i;
                 for (i = 0; i < visibleColOrder.length; i++) {
                     cols[i] = visibleColOrder[i];
                 }
                 for (final Iterator<String> it = collapsedColumns.iterator(); it
                         .hasNext();) {
                     cols[i++] = it.next();
                 }
             }
             final Action[] actions = new Action[cols.length];
 
             for (int i = 0; i < cols.length; i++) {
                 final String cid = (String) cols[i];
                 final HeaderCell c = getHeaderCell(cid);
                 final VisibleColumnAction a = new VisibleColumnAction(
                         c.getColKey());
                 a.setCaption(c.getCaption());
                 if (!c.isEnabled()) {
                     a.setCollapsed(true);
                 }
                 if (noncollapsibleColumns.contains(cid)) {
                     a.setNoncollapsible(true);
                 }
                 actions[i] = a;
             }
             return actions;
         }
 
         @Override
         public ApplicationConnection getClient() {
             return client;
         }
 
         @Override
         public String getPaintableId() {
             return paintableId;
         }
 
         /**
          * Returns column alignments for visible columns
          */
         public char[] getColumnAlignments() {
             final Iterator<Widget> it = visibleCells.iterator();
             final char[] aligns = new char[visibleCells.size()];
             int colIndex = 0;
             while (it.hasNext()) {
                 aligns[colIndex++] = ((HeaderCell) it.next()).getAlign();
             }
             return aligns;
         }
 
         /**
          * Disables the automatic calculation of all column widths by forcing
          * the widths to be "defined" thus turning off expand ratios and such.
          */
         public void disableAutoColumnWidthCalculation(HeaderCell source) {
             for (HeaderCell cell : availableCells.values()) {
                 cell.disableAutoWidthCalculation();
             }
             // fire column resize events for all columns but the source of the
             // resize action, since an event will fire separately for this.
             ArrayList<HeaderCell> columns = new ArrayList<HeaderCell>(
                     availableCells.values());
             columns.remove(source);
             sendColumnWidthUpdates(columns);
             forceRealignColumnHeaders();
         }
     }
 
     /**
      * A cell in the footer
      */
     public class FooterCell extends Widget {
         private final Element td = DOM.createTD();
         private final Element captionContainer = DOM.createDiv();
         private char align = ALIGN_LEFT;
         private int width = -1;
         private float expandRatio = 0;
         private final String cid;
         boolean definedWidth = false;
         private int naturalWidth = -1;
 
         public FooterCell(String colId, String headerText) {
             cid = colId;
 
             setText(headerText);
 
             // ensure no clipping initially (problem on column additions)
             DOM.setStyleAttribute(captionContainer, "overflow", "visible");
 
             DOM.sinkEvents(captionContainer, Event.MOUSEEVENTS);
 
             DOM.appendChild(td, captionContainer);
 
             DOM.sinkEvents(td, Event.MOUSEEVENTS | Event.ONDBLCLICK
                     | Event.ONCONTEXTMENU);
 
             setElement(td);
 
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         protected void updateStyleNames(String primaryStyleName) {
             captionContainer.setClassName(primaryStyleName
                     + "-footer-container");
         }
 
         /**
          * Sets the text of the footer
          * 
          * @param footerText
          *            The text in the footer
          */
         public void setText(String footerText) {
             if (footerText == null || footerText.equals("")) {
                 footerText = "&nbsp;";
             }
 
             DOM.setInnerHTML(captionContainer, footerText);
         }
 
         /**
          * Set alignment of the text in the cell
          * 
          * @param c
          *            The alignment which can be ALIGN_CENTER, ALIGN_LEFT,
          *            ALIGN_RIGHT
          */
         public void setAlign(char c) {
             if (align != c) {
                 switch (c) {
                 case ALIGN_CENTER:
                     DOM.setStyleAttribute(captionContainer, "textAlign",
                             "center");
                     break;
                 case ALIGN_RIGHT:
                     DOM.setStyleAttribute(captionContainer, "textAlign",
                             "right");
                     break;
                 default:
                     DOM.setStyleAttribute(captionContainer, "textAlign", "");
                     break;
                 }
             }
             align = c;
         }
 
         /**
          * Get the alignment of the text int the cell
          * 
          * @return Returns either ALIGN_CENTER, ALIGN_LEFT or ALIGN_RIGHT
          */
         public char getAlign() {
             return align;
         }
 
         /**
          * Sets the width of the cell. This width should not include any
          * possible indent modifications that are present in
          * {@link VScrollTableBody#getMaxIndent()}.
          * 
          * @param w
          *            The width of the cell
          * @param ensureDefinedWidth
          *            Ensures that the given width is not recalculated
          */
         public void setWidth(int w, boolean ensureDefinedWidth) {
 
             if (ensureDefinedWidth) {
                 definedWidth = true;
                 // on column resize expand ratio becomes zero
                 expandRatio = 0;
             }
             if (width == w) {
                 return;
             }
             if (width == -1) {
                 // go to default mode, clip content if necessary
                 DOM.setStyleAttribute(captionContainer, "overflow", "");
             }
             width = w;
             if (w == -1) {
                 DOM.setStyleAttribute(captionContainer, "width", "");
                 setWidth("");
             } else {
                 /*
                  * Reduce width with one pixel for the right border since the
                  * footers does not have any spacers between them.
                  */
                 final int borderWidths = 1;
 
                 // Set the container width (check for negative value)
                 captionContainer.getStyle().setPropertyPx("width",
                         Math.max(w - borderWidths, 0));
 
                 /*
                  * if we already have tBody, set the header width properly, if
                  * not defer it. IE will fail with complex float in table header
                  * unless TD width is not explicitly set.
                  */
                 if (scrollBody != null) {
                     int maxIndent = scrollBody.getMaxIndent();
                     if (w < maxIndent
                             && tFoot.visibleCells.indexOf(this) == getHierarchyColumnIndex()) {
                         // ensure there's room for the indent
                         w = maxIndent;
                     }
                     int tdWidth = w + scrollBody.getCellExtraWidth()
                             - borderWidths;
                     setWidth(Math.max(tdWidth, 0) + "px");
                 } else {
                     Scheduler.get().scheduleDeferred(new Command() {
 
                         @Override
                         public void execute() {
                             int tdWidth = width;
                             int maxIndent = scrollBody.getMaxIndent();
                             if (tdWidth < maxIndent
                                     && tFoot.visibleCells.indexOf(this) == getHierarchyColumnIndex()) {
                                 // ensure there's room for the indent
                                 tdWidth = maxIndent;
                             }
                             tdWidth += scrollBody.getCellExtraWidth()
                                     - borderWidths;
                             setWidth(Math.max(tdWidth, 0) + "px");
                         }
                     });
                 }
             }
         }
 
         /**
          * Sets the width to undefined
          */
         public void setUndefinedWidth() {
             definedWidth = false;
             setWidth(-1, false);
         }
 
         /**
          * Detects if width is fixed by developer on server side or resized to
          * current width by user.
          * 
          * @return true if defined, false if "natural" width
          */
         public boolean isDefinedWidth() {
             return definedWidth && width >= 0;
         }
 
         /**
          * Returns the pixels width of the footer cell.
          * 
          * @return The width in pixels
          */
         public int getWidth() {
             return width;
         }
 
         /**
          * Sets the expand ratio of the cell
          * 
          * @param floatAttribute
          *            The expand ratio
          */
         public void setExpandRatio(float floatAttribute) {
             expandRatio = floatAttribute;
         }
 
         /**
          * Returns the expand ration of the cell
          * 
          * @return The expand ratio
          */
         public float getExpandRatio() {
             return expandRatio;
         }
 
         /**
          * Is the cell enabled?
          * 
          * @return True if enabled else False
          */
         public boolean isEnabled() {
             return getParent() != null;
         }
 
         /**
          * Handle column clicking
          */
 
         @Override
         public void onBrowserEvent(Event event) {
             if (enabled && event != null) {
                 handleCaptionEvent(event);
 
                 if (DOM.eventGetType(event) == Event.ONMOUSEUP) {
                     scrollBodyPanel.setFocus(true);
                 }
                 boolean stopPropagation = true;
                 if (event.getTypeInt() == Event.ONCONTEXTMENU
                         && !client.hasEventListeners(VScrollTablePatched.this,
                                 TableConstants.FOOTER_CLICK_EVENT_ID)) {
                     // Show browser context menu if a footer click listener is
                     // not present
                     stopPropagation = false;
                 }
                 if (stopPropagation) {
                     event.stopPropagation();
                     event.preventDefault();
                 }
             }
         }
 
         /**
          * Handles a event on the captions
          * 
          * @param event
          *            The event to handle
          */
         protected void handleCaptionEvent(Event event) {
             if (event.getTypeInt() == Event.ONMOUSEUP
                     || event.getTypeInt() == Event.ONDBLCLICK) {
                 fireFooterClickedEvent(event);
             }
         }
 
         /**
          * Fires a footer click event after the user has clicked a column footer
          * cell
          * 
          * @param event
          *            The click event
          */
         private void fireFooterClickedEvent(Event event) {
             if (client.hasEventListeners(VScrollTablePatched.this,
                     TableConstants.FOOTER_CLICK_EVENT_ID)) {
                 MouseEventDetails details = MouseEventDetailsBuilder
                         .buildMouseEventDetails(event);
                 client.updateVariable(paintableId, "footerClickEvent",
                         details.toString(), false);
                 client.updateVariable(paintableId, "footerClickCID", cid, true);
             }
         }
 
         /**
          * Returns the column key of the column
          * 
          * @return The column key
          */
         public String getColKey() {
             return cid;
         }
 
         /**
          * Detects the natural minimum width for the column of this header cell.
          * If column is resized by user or the width is defined by server the
          * actual width is returned. Else the natural min width is returned.
          * 
          * @param columnIndex
          *            column index hint, if -1 (unknown) it will be detected
          * 
          * @return
          */
         public int getNaturalColumnWidth(int columnIndex) {
             final int iw = columnIndex == getHierarchyColumnIndex() ? scrollBody
                     .getMaxIndent() : 0;
             if (isDefinedWidth()) {
                 if (iw > width) {
                     return iw;
                 }
                 return width;
             } else {
                 if (naturalWidth < 0) {
                     // This is recently revealed column. Try to detect a proper
                     // value (greater of header and data
                     // cols)
 
                     final int hw = ((Element) getElement().getLastChild())
                             .getOffsetWidth() + getHeaderPadding();
                     if (columnIndex < 0) {
                         columnIndex = 0;
                         for (Iterator<Widget> it = tHead.iterator(); it
                                 .hasNext(); columnIndex++) {
                             if (it.next() == this) {
                                 break;
                             }
                         }
                     }
                     final int cw = scrollBody.getColWidth(columnIndex);
                     naturalWidth = (hw > cw ? hw : cw);
                 }
                 if (iw > naturalWidth) {
                     return iw;
                 } else {
                     return naturalWidth;
                 }
             }
         }
 
         public void setNaturalMinimumColumnWidth(int w) {
             naturalWidth = w;
         }
     }
 
     /**
      * HeaderCell that is header cell for row headers.
      * 
      * Reordering disabled and clicking on it resets sorting.
      */
     public class RowHeadersFooterCell extends FooterCell {
 
         RowHeadersFooterCell() {
             super(ROW_HEADER_COLUMN_KEY, "");
         }
 
         @Override
         protected void handleCaptionEvent(Event event) {
             // NOP: RowHeaders cannot be reordered
             // TODO It'd be nice to reset sorting here
         }
     }
 
     /**
      * The footer of the table which can be seen in the bottom of the Table.
      */
     public class TableFooter extends Panel {
 
         private static final int WRAPPER_WIDTH = 900000;
 
         ArrayList<Widget> visibleCells = new ArrayList<Widget>();
         HashMap<String, FooterCell> availableCells = new HashMap<String, FooterCell>();
 
         Element div = DOM.createDiv();
         Element hTableWrapper = DOM.createDiv();
         Element hTableContainer = DOM.createDiv();
         Element table = DOM.createTable();
         Element headerTableBody = DOM.createTBody();
         Element tr = DOM.createTR();
 
         public TableFooter() {
 
             DOM.setStyleAttribute(hTableWrapper, "overflow", "hidden");
 
             DOM.appendChild(table, headerTableBody);
             DOM.appendChild(headerTableBody, tr);
             DOM.appendChild(hTableContainer, table);
             DOM.appendChild(hTableWrapper, hTableContainer);
             DOM.appendChild(div, hTableWrapper);
             setElement(div);
 
             availableCells.put(ROW_HEADER_COLUMN_KEY,
                     new RowHeadersFooterCell());
 
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         protected void updateStyleNames(String primaryStyleName) {
             hTableWrapper.setClassName(primaryStyleName + "-footer");
             setStyleName(primaryStyleName + "-footer-wrap");
             for (FooterCell c : availableCells.values()) {
                 c.updateStyleNames(primaryStyleName);
             }
         }
 
         @Override
         public void clear() {
             for (String cid : availableCells.keySet()) {
                 removeCell(cid);
             }
             availableCells.clear();
             availableCells.put(ROW_HEADER_COLUMN_KEY,
                     new RowHeadersFooterCell());
         }
 
         /*
          * (non-Javadoc)
          * 
          * @see
          * com.google.gwt.user.client.ui.Panel#remove(com.google.gwt.user.client
          * .ui.Widget)
          */
 
         @Override
         public boolean remove(Widget w) {
             if (visibleCells.contains(w)) {
                 visibleCells.remove(w);
                 orphan(w);
                 DOM.removeChild(DOM.getParent(w.getElement()), w.getElement());
                 return true;
             }
             return false;
         }
 
         /*
          * (non-Javadoc)
          * 
          * @see com.google.gwt.user.client.ui.HasWidgets#iterator()
          */
 
         @Override
         public Iterator<Widget> iterator() {
             return visibleCells.iterator();
         }
 
         /**
          * Gets a footer cell which represents the given columnId
          * 
          * @param cid
          *            The columnId
          * 
          * @return The cell
          */
         public FooterCell getFooterCell(String cid) {
             return availableCells.get(cid);
         }
 
         /**
          * Gets a footer cell by using a column index
          * 
          * @param index
          *            The index of the column
          * @return The Cell
          */
         public FooterCell getFooterCell(int index) {
             if (index < visibleCells.size()) {
                 return (FooterCell) visibleCells.get(index);
             } else {
                 return null;
             }
         }
 
         /**
          * Updates the cells contents when updateUIDL request is received
          * 
          * @param uidl
          *            The UIDL
          */
         public void updateCellsFromUIDL(UIDL uidl) {
             Iterator<?> columnIterator = uidl.getChildIterator();
             HashSet<String> updated = new HashSet<String>();
             while (columnIterator.hasNext()) {
                 final UIDL col = (UIDL) columnIterator.next();
                 final String cid = col.getStringAttribute("cid");
                 updated.add(cid);
 
                 String caption = col.hasAttribute("fcaption") ? col
                         .getStringAttribute("fcaption") : "";
                 FooterCell c = getFooterCell(cid);
                 if (c == null) {
                     c = new FooterCell(cid, caption);
                     availableCells.put(cid, c);
                     if (initializedAndAttached) {
                         // we will need a column width recalculation
                         initializedAndAttached = false;
                         initialContentReceived = false;
                         isNewBody = true;
                     }
                 } else {
                     c.setText(caption);
                 }
 
                 if (col.hasAttribute("align")) {
                     c.setAlign(col.getStringAttribute("align").charAt(0));
                 } else {
                     c.setAlign(ALIGN_LEFT);
 
                 }
                 if (col.hasAttribute("width")) {
                     if (scrollBody == null) {
                         // Already updated by setColWidth called from
                         // TableHeads.updateCellsFromUIDL in case of a server
                         // side resize
                         int width = col.getIntAttribute("width");
                         c.setWidth(width, true);
                     }
                 } else if (recalcWidths) {
                     c.setUndefinedWidth();
                 }
                 if (col.hasAttribute("er")) {
                     c.setExpandRatio(col.getFloatAttribute("er"));
                 }
                 if (col.hasAttribute("collapsed")) {
                     // ensure header is properly removed from parent (case when
                     // collapsing happens via servers side api)
                     if (c.isAttached()) {
                         c.removeFromParent();
                         headerChangedDuringUpdate = true;
                     }
                 }
             }
 
             // check for orphaned header cells
             for (Iterator<String> cit = availableCells.keySet().iterator(); cit
                     .hasNext();) {
                 String cid = cit.next();
                 if (!updated.contains(cid)) {
                     removeCell(cid);
                     cit.remove();
                 }
             }
         }
 
         /**
          * Set a footer cell for a specified column index
          * 
          * @param index
          *            The index
          * @param cell
          *            The footer cell
          */
         public void setFooterCell(int index, FooterCell cell) {
             if (cell.isEnabled()) {
                 // we're moving the cell
                 DOM.removeChild(tr, cell.getElement());
                 orphan(cell);
                 visibleCells.remove(cell);
             }
             if (index < visibleCells.size()) {
                 // insert to right slot
                 DOM.insertChild(tr, cell.getElement(), index);
                 adopt(cell);
                 visibleCells.add(index, cell);
             } else if (index == visibleCells.size()) {
                 // simply append
                 DOM.appendChild(tr, cell.getElement());
                 adopt(cell);
                 visibleCells.add(cell);
             } else {
                 throw new RuntimeException(
                         "Header cells must be appended in order");
             }
         }
 
         /**
          * Remove a cell by using the columnId
          * 
          * @param colKey
          *            The columnId to remove
          */
         public void removeCell(String colKey) {
             final FooterCell c = getFooterCell(colKey);
             remove(c);
         }
 
         /**
          * Enable a column (Sets the footer cell)
          * 
          * @param cid
          *            The columnId
          * @param index
          *            The index of the column
          */
         public void enableColumn(String cid, int index) {
             final FooterCell c = getFooterCell(cid);
             if (!c.isEnabled() || getFooterCell(index) != c) {
                 setFooterCell(index, c);
                 if (initializedAndAttached) {
                     headerChangedDuringUpdate = true;
                 }
             }
         }
 
         /**
          * Disable browser measurement of the table width
          */
         public void disableBrowserIntelligence() {
             DOM.setStyleAttribute(hTableContainer, "width", WRAPPER_WIDTH
                     + "px");
         }
 
         /**
          * Enable browser measurement of the table width
          */
         public void enableBrowserIntelligence() {
             DOM.setStyleAttribute(hTableContainer, "width", "");
         }
 
         /**
          * Set the horizontal position in the cell in the footer. This is done
          * when a horizontal scrollbar is present.
          * 
          * @param scrollLeft
          *            The value of the leftScroll
          */
         public void setHorizontalScrollPosition(int scrollLeft) {
             hTableWrapper.setScrollLeft(scrollLeft);
         }
 
         /**
          * Swap cells when the column are dragged
          * 
          * @param oldIndex
          *            The old index of the cell
          * @param newIndex
          *            The new index of the cell
          */
         public void moveCell(int oldIndex, int newIndex) {
             final FooterCell hCell = getFooterCell(oldIndex);
             final Element cell = hCell.getElement();
 
             visibleCells.remove(oldIndex);
             DOM.removeChild(tr, cell);
 
             DOM.insertChild(tr, cell, newIndex);
             visibleCells.add(newIndex, hCell);
         }
     }
 
     /**
      * This Panel can only contain VScrollTableRow type of widgets. This
      * "simulates" very large table, keeping spacers which take room of
      * unrendered rows.
      * 
      */
     public class VScrollTableBody extends Panel {
         protected VScrollTableRow createScrollTableRow(UIDL uidl, char[] aligns) {
             return new VScrollTableRow(uidl, aligns);
         }
 
         protected VScrollTableRow createScrollTableRow() {
             return new VScrollTableRow();
         }
 
         public static final int DEFAULT_ROW_HEIGHT = 24;
 
         private double rowHeight = -1;
 
         public final LinkedList<Widget> renderedRows = new LinkedList<Widget>();
 
         /**
          * Due some optimizations row height measuring is deferred and initial
          * set of rows is rendered detached. Flag set on when table body has
          * been attached in dom and rowheight has been measured.
          */
         private boolean tBodyMeasurementsDone = false;
 
         Element preSpacer = DOM.createDiv();
         Element postSpacer = DOM.createDiv();
 
         Element container = DOM.createDiv();
 
         TableSectionElement tBodyElement = Document.get().createTBodyElement();
         Element table = DOM.createTable();
 
         private int firstRendered;
         private int lastRendered;
 
         private char[] aligns;
 
         protected VScrollTableBody() {
             constructDOM();
             setElement(container);
         }
 
         public void setLastRendered(int lastRendered) {
             if (totalRows >= 0 && lastRendered > totalRows) {
                 VConsole.log("setLastRendered: " + this.lastRendered + " -> "
                         + lastRendered);
                 this.lastRendered = totalRows - 1;
             } else {
                 this.lastRendered = lastRendered;
             }
         }
 
         public int getLastRendered() {
             return lastRendered;
         }
 
         public int getFirstRendered() {
             return firstRendered;
         }
 
         public VScrollTableRow getRowByRowIndex(int indexInTable) {
             int internalIndex = indexInTable - firstRendered;
             if (internalIndex >= 0 && internalIndex < renderedRows.size()) {
                 return (VScrollTableRow) renderedRows.get(internalIndex);
             } else {
                 return null;
             }
         }
 
         /**
          * @return the height of scrollable body, subpixels ceiled.
          */
         public int getRequiredHeight() {
             return preSpacer.getOffsetHeight() + postSpacer.getOffsetHeight()
                     + Util.getRequiredHeight(table);
         }
 
         private void constructDOM() {
             if (BrowserInfo.get().isIE()) {
                 table.setPropertyInt("cellSpacing", 0);
             }
 
             table.appendChild(tBodyElement);
             DOM.appendChild(container, preSpacer);
             DOM.appendChild(container, table);
             DOM.appendChild(container, postSpacer);
             if (BrowserInfo.get().requiresTouchScrollDelegate()) {
                 NodeList<Node> childNodes = container.getChildNodes();
                 for (int i = 0; i < childNodes.getLength(); i++) {
                     Element item = (Element) childNodes.getItem(i);
                     item.getStyle().setProperty("webkitTransform",
                             "translate3d(0,0,0)");
                 }
             }
             updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
         }
 
         protected void updateStyleNames(String primaryStyleName) {
             table.setClassName(primaryStyleName + "-table");
             preSpacer.setClassName(primaryStyleName + "-row-spacer");
             postSpacer.setClassName(primaryStyleName + "-row-spacer");
             for (Widget w : renderedRows) {
                 VScrollTableRow row = (VScrollTableRow) w;
                 row.updateStyleNames(primaryStyleName);
             }
         }
 
         public int getAvailableWidth() {
             int availW = scrollBodyPanel.getOffsetWidth() - getBorderWidth();
             return availW;
         }
 
         public void renderInitialRows(UIDL rowData, int firstIndex, int rows) {
             firstRendered = firstIndex;
             setLastRendered(firstIndex + rows - 1);
             final Iterator<?> it = rowData.getChildIterator();
             aligns = tHead.getColumnAlignments();
             while (it.hasNext()) {
                 final VScrollTableRow row = createRow((UIDL) it.next(), aligns);
                 addRow(row);
             }
             if (isAttached()) {
                 fixSpacers();
             }
         }
 
         public void renderRows(UIDL rowData, int firstIndex, int rows) {
             // FIXME REVIEW
             aligns = tHead.getColumnAlignments();
             final Iterator<?> it = rowData.getChildIterator();
             if (firstIndex == lastRendered + 1) {
                 while (it.hasNext()) {
                     final VScrollTableRow row = prepareRow((UIDL) it.next());
                     addRow(row);
                     setLastRendered(lastRendered + 1);
                 }
                 fixSpacers();
             } else if (firstIndex + rows == firstRendered) {
                 final VScrollTableRow[] rowArray = new VScrollTableRow[rows];
                 int i = rows;
                 while (it.hasNext()) {
                     i--;
                     rowArray[i] = prepareRow((UIDL) it.next());
                 }
                 for (i = 0; i < rows; i++) {
                     addRowBeforeFirstRendered(rowArray[i]);
                     firstRendered--;
                 }
             } else {
                 // completely new set of rows
 
                 // there can't be sanity checks for last rendered within this
                 // while loop regardless of what has been set previously, so
                 // change it temporarily to true and then return the original
                 // value
                 boolean temp = postponeSanityCheckForLastRendered;
                 postponeSanityCheckForLastRendered = true;
                 while (lastRendered + 1 > firstRendered) {
                     unlinkRow(false);
                 }
                 postponeSanityCheckForLastRendered = temp;
                 VScrollTableRow row = prepareRow((UIDL) it.next());
                 firstRendered = firstIndex;
                 setLastRendered(firstIndex - 1);
                 addRow(row);
                 setLastRendered(lastRendered + 1);
                 setContainerHeight();
                 fixSpacers();
                 while (it.hasNext()) {
                     addRow(prepareRow((UIDL) it.next()));
                     setLastRendered(lastRendered + 1);
                 }
                 fixSpacers();
             }
 
             // this may be a new set of rows due content change,
             // ensure we have proper cache rows
             ensureCacheFilled();
         }
 
         /**
          * Ensure we have the correct set of rows on client side, e.g. if the
          * content on the server side has changed, or the client scroll position
          * has changed since the last request.
          */
         protected void ensureCacheFilled() {
             int reactFirstRow = (int) (firstRowInViewPort - pageLength
                     * cache_react_rate);
             int reactLastRow = (int) (firstRowInViewPort + pageLength + pageLength
                     * cache_react_rate);
             if (reactFirstRow < 0) {
                 reactFirstRow = 0;
             }
             if (reactLastRow >= totalRows) {
                 reactLastRow = totalRows - 1;
             }
             if (lastRendered < reactFirstRow || firstRendered > reactLastRow) {
                 /*
                  * #8040 - scroll position is completely changed since the
                  * latest request, so request a new set of rows.
                  * 
                  * TODO: We should probably check whether the fetched rows match
                  * the current scroll position right when they arrive, so as to
                  * not waste time rendering a set of rows that will never be
                  * visible...
                  */
                 rowRequestHandler.triggerRowFetch(reactFirstRow, reactLastRow
                         - reactFirstRow + 1, 1);
             } else if (lastRendered < reactLastRow) {
                 // get some cache rows below visible area
                 rowRequestHandler.triggerRowFetch(lastRendered + 1,
                         reactLastRow - lastRendered, 1);
             } else if (firstRendered > reactFirstRow) {
                 /*
                  * Branch for fetching cache above visible area.
                  * 
                  * If cache needed for both before and after visible area, this
                  * will be rendered after-cache is received and rendered. So in
                  * some rare situations the table may make two cache visits to
                  * server.
                  */
                 rowRequestHandler.triggerRowFetch(reactFirstRow, firstRendered
                         - reactFirstRow, 1);
             }
         }
 
         /**
          * Inserts rows as provided in the rowData starting at firstIndex.
          * 
          * @param rowData
          * @param firstIndex
          * @param rows
          *            the number of rows
          * @return a list of the rows added.
          */
         protected List<VScrollTableRow> insertRows(UIDL rowData,
                 int firstIndex, int rows) {
             aligns = tHead.getColumnAlignments();
             final Iterator<?> it = rowData.getChildIterator();
             List<VScrollTableRow> insertedRows = new ArrayList<VScrollTableRow>();
 
             if (firstIndex == lastRendered + 1) {
                 while (it.hasNext()) {
                     final VScrollTableRow row = prepareRow((UIDL) it.next());
                     addRow(row);
                     insertedRows.add(row);
                     if (postponeSanityCheckForLastRendered) {
                         lastRendered++;
                     } else {
                         setLastRendered(lastRendered + 1);
                     }
                 }
                 fixSpacers();
             } else if (firstIndex + rows == firstRendered) {
                 final VScrollTableRow[] rowArray = new VScrollTableRow[rows];
                 int i = rows;
                 while (it.hasNext()) {
                     i--;
                     rowArray[i] = prepareRow((UIDL) it.next());
                 }
                 for (i = 0; i < rows; i++) {
                     addRowBeforeFirstRendered(rowArray[i]);
                     insertedRows.add(rowArray[i]);
                     firstRendered--;
                 }
             } else {
                 // insert in the middle
                 int ix = firstIndex;
                 while (it.hasNext()) {
                     VScrollTableRow row = prepareRow((UIDL) it.next());
                     insertRowAt(row, ix);
                     insertedRows.add(row);
                     if (postponeSanityCheckForLastRendered) {
                         lastRendered++;
                     } else {
                         setLastRendered(lastRendered + 1);
                     }
                     ix++;
                 }
                 fixSpacers();
             }
             return insertedRows;
         }
 
         protected List<VScrollTableRow> insertAndReindexRows(UIDL rowData,
                 int firstIndex, int rows) {
             List<VScrollTableRow> inserted = insertRows(rowData, firstIndex,
                     rows);
             int actualIxOfFirstRowAfterInserted = firstIndex + rows
                     - firstRendered;
             for (int ix = actualIxOfFirstRowAfterInserted; ix < renderedRows
                     .size(); ix++) {
                 VScrollTableRow r = (VScrollTableRow) renderedRows.get(ix);
                 r.setIndex(r.getIndex() + rows);
             }
             setContainerHeight();
             return inserted;
         }
 
         protected void insertRowsDeleteBelow(UIDL rowData, int firstIndex,
                 int rows) {
             unlinkAllRowsStartingAt(firstIndex);
             insertRows(rowData, firstIndex, rows);
             setContainerHeight();
         }
 
         /**
          * This method is used to instantiate new rows for this table. It
          * automatically sets correct widths to rows cells and assigns correct
          * client reference for child widgets.
          * 
          * This method can be called only after table has been initialized
          * 
          * @param uidl
          */
         private VScrollTableRow prepareRow(UIDL uidl) {
             final VScrollTableRow row = createRow(uidl, aligns);
             row.initCellWidths();
             return row;
         }
 
         protected VScrollTableRow createRow(UIDL uidl, char[] aligns2) {
             if (uidl.hasAttribute("gen_html")) {
                 // This is a generated row.
                 return new VScrollTableGeneratedRow(uidl, aligns2);
             }
             return createScrollTableRow(uidl, aligns2);
         }
 
         private void addRowBeforeFirstRendered(VScrollTableRow row) {
             row.setIndex(firstRendered - 1);
             if (row.isSelected()) {
                 row.addStyleName("v-selected");
             }
             tBodyElement.insertBefore(row.getElement(),
                     tBodyElement.getFirstChild());
             adopt(row);
             renderedRows.add(0, row);
         }
 
         private void addRow(VScrollTableRow row) {
             row.setIndex(firstRendered + renderedRows.size());
             if (row.isSelected()) {
                 row.addStyleName("v-selected");
             }
             tBodyElement.appendChild(row.getElement());
             // Add to renderedRows before adopt so iterator() will return also
             // this row if called in an attach handler (#9264)
             renderedRows.add(row);
             adopt(row);
         }
 
         private void insertRowAt(VScrollTableRow row, int index) {
             row.setIndex(index);
             if (row.isSelected()) {
                 row.addStyleName("v-selected");
             }
             if (index > 0) {
                 VScrollTableRow sibling = getRowByRowIndex(index - 1);
                 tBodyElement
                         .insertAfter(row.getElement(), sibling.getElement());
             } else {
                 VScrollTableRow sibling = getRowByRowIndex(index);
                 tBodyElement.insertBefore(row.getElement(),
                         sibling.getElement());
             }
             adopt(row);
             int actualIx = index - firstRendered;
             renderedRows.add(actualIx, row);
         }
 
         @Override
         public Iterator<Widget> iterator() {
             return renderedRows.iterator();
         }
 
         /**
          * @return false if couldn't remove row
          */
         protected boolean unlinkRow(boolean fromBeginning) {
             if (lastRendered - firstRendered < 0) {
                 return false;
             }
             int actualIx;
             if (fromBeginning) {
                 actualIx = 0;
                 firstRendered++;
             } else {
                 actualIx = renderedRows.size() - 1;
                 if (postponeSanityCheckForLastRendered) {
                     --lastRendered;
                 } else {
                     setLastRendered(lastRendered - 1);
                 }
             }
             if (actualIx >= 0) {
                 unlinkRowAtActualIndex(actualIx);
                 fixSpacers();
                 return true;
             }
             return false;
         }
 
         protected void unlinkRows(int firstIndex, int count) {
             if (count < 1) {
                 return;
             }
             if (firstRendered > firstIndex
                     && firstRendered < firstIndex + count) {
                 count = count - (firstRendered - firstIndex);
                 firstIndex = firstRendered;
             }
             int lastIndex = firstIndex + count - 1;
             if (lastRendered < lastIndex) {
                 lastIndex = lastRendered;
             }
             for (int ix = lastIndex; ix >= firstIndex; ix--) {
                 unlinkRowAtActualIndex(actualIndex(ix));
                 if (postponeSanityCheckForLastRendered) {
                     // partialUpdate handles sanity check later
                     lastRendered--;
                 } else {
                     setLastRendered(lastRendered - 1);
                 }
             }
             fixSpacers();
         }
 
         protected void unlinkAndReindexRows(int firstIndex, int count) {
             unlinkRows(firstIndex, count);
             int actualFirstIx = firstIndex - firstRendered;
             for (int ix = actualFirstIx; ix < renderedRows.size(); ix++) {
                 VScrollTableRow r = (VScrollTableRow) renderedRows.get(ix);
                 r.setIndex(r.getIndex() - count);
             }
             setContainerHeight();
         }
 
         protected void unlinkAllRowsStartingAt(int index) {
             if (firstRendered > index) {
                 index = firstRendered;
             }
             for (int ix = renderedRows.size() - 1; ix >= index; ix--) {
                 unlinkRowAtActualIndex(actualIndex(ix));
                 setLastRendered(lastRendered - 1);
             }
             fixSpacers();
         }
 
         private int actualIndex(int index) {
             return index - firstRendered;
         }
 
         private void unlinkRowAtActualIndex(int index) {
             final VScrollTableRow toBeRemoved = (VScrollTableRow) renderedRows
                     .get(index);
             tBodyElement.removeChild(toBeRemoved.getElement());
             orphan(toBeRemoved);
             renderedRows.remove(index);
         }
 
         @Override
         public boolean remove(Widget w) {
             throw new UnsupportedOperationException();
         }
 
         /**
          * Fix container blocks height according to totalRows to avoid
          * "bouncing" when scrolling
          */
         private void setContainerHeight() {
             fixSpacers();
             DOM.setStyleAttribute(container, "height",
                     measureRowHeightOffset(totalRows) + "px");
         }
 
         private void fixSpacers() {
             int prepx = measureRowHeightOffset(firstRendered);
             if (prepx < 0) {
                 prepx = 0;
             }
             preSpacer.getStyle().setPropertyPx("height", prepx);
             int postpx;
             if (pageLength == 0 && totalRows == pageLength) {
                 /*
                  * TreeTable depends on having lastRendered out of sync in some
                  * situations, which makes this method miss the special
                  * situation in which one row worth of post spacer to be added
                  * if there are no rows in the table. #9203
                  */
                 postpx = measureRowHeightOffset(1);
             } else {
                 postpx = measureRowHeightOffset(totalRows - 1)
                         - measureRowHeightOffset(lastRendered);
             }
 
             if (postpx < 0) {
                 postpx = 0;
             }
             postSpacer.getStyle().setPropertyPx("height", postpx);
         }
 
         public double getRowHeight() {
             return getRowHeight(false);
         }
 
         public double getRowHeight(boolean forceUpdate) {
             if (tBodyMeasurementsDone && !forceUpdate) {
                 return rowHeight;
             } else {
                 if (tBodyElement.getRows().getLength() > 0) {
                     int tableHeight = getTableHeight();
                     int rowCount = tBodyElement.getRows().getLength();
                     rowHeight = tableHeight / (double) rowCount;
                 } else {
                     // Special cases if we can't just measure the current rows
                     if (!Double.isNaN(lastKnownRowHeight)) {
                         // Use previous value if available
                         if (BrowserInfo.get().isIE()) {
                             /*
                              * IE needs to reflow the table element at this
                              * point to work correctly (e.g.
                              * com.vaadin.tests.components.table.
                              * ContainerSizeChange) - the other code paths
                              * already trigger reflows, but here it must be done
                              * explicitly.
                              */
                             getTableHeight();
                         }
                         rowHeight = lastKnownRowHeight;
                     } else if (isAttached()) {
                         // measure row height by adding a dummy row
                         VScrollTableRow scrollTableRow = createScrollTableRow();
                         tBodyElement.appendChild(scrollTableRow.getElement());
                         getRowHeight(forceUpdate);
                         tBodyElement.removeChild(scrollTableRow.getElement());
                     } else {
                         // TODO investigate if this can never happen anymore
                         return DEFAULT_ROW_HEIGHT;
                     }
                 }
                 lastKnownRowHeight = rowHeight;
                 tBodyMeasurementsDone = true;
                 return rowHeight;
             }
         }
 
         public int getTableHeight() {
             return table.getOffsetHeight();
         }
 
         /**
          * Returns the width available for column content.
          * 
          * @param columnIndex
          * @return
          */
         public int getColWidth(int columnIndex) {
             if (tBodyMeasurementsDone) {
                 if (renderedRows.isEmpty()) {
                     // no rows yet rendered
                     return 0;
                 }
                 for (Widget row : renderedRows) {
                     if (!(row instanceof VScrollTableGeneratedRow)) {
                         TableRowElement tr = row.getElement().cast();
                         Element wrapperdiv = tr.getCells().getItem(columnIndex)
                                 .getFirstChildElement().cast();
                         return wrapperdiv.getOffsetWidth();
                     }
                 }
                 return 0;
             } else {
                 return 0;
             }
         }
 
         /**
          * Sets the content width of a column.
          * 
          * Due IE limitation, we must set the width to a wrapper elements inside
          * table cells (with overflow hidden, which does not work on td
          * elements).
          * 
          * To get this work properly crossplatform, we will also set the width
          * of td.
          * 
          * @param colIndex
          * @param w
          */
         public void setColWidth(int colIndex, int w) {
             for (Widget row : renderedRows) {
                 ((VScrollTableRow) row).setCellWidth(colIndex, w);
             }
         }
 
         private int cellExtraWidth = -1;
 
         /**
          * Method to return the space used for cell paddings + border.
          */
         private int getCellExtraWidth() {
             if (!isVisibleInHierarchy()) {
                 return 0;
             }
             if (cellExtraWidth < 0) {
                 detectExtrawidth();
             }
             return cellExtraWidth;
         }
 
         /**
          * This method exists for the needs of {@link VTreeTable} only. May be
          * removed or replaced in the future.</br> </br> Returns the maximum
          * indent of the hierarcyColumn, if applicable.
          * 
          * @see {@link VScrollTable#getHierarchyColumnIndex()}
          * 
          * @return maximum indent in pixels
          */
         protected int getMaxIndent() {
             return 0;
         }
 
         /**
          * This method exists for the needs of {@link VTreeTable} only. May be
          * removed or replaced in the future.</br> </br> Calculates the maximum
          * indent of the hierarcyColumn, if applicable.
          */
         protected void calculateMaxIndent() {
             // NOP
         }
 
         private void detectExtrawidth() {
             NodeList<TableRowElement> rows = tBodyElement.getRows();
             if (rows.getLength() == 0) {
                 /* need to temporary add empty row and detect */
                 VScrollTableRow scrollTableRow = createScrollTableRow();
                 scrollTableRow.updateStyleNames(VScrollTablePatched.this
                         .getStylePrimaryName());
                 tBodyElement.appendChild(scrollTableRow.getElement());
                 detectExtrawidth();
                 tBodyElement.removeChild(scrollTableRow.getElement());
             } else {
                 boolean noCells = false;
                 TableRowElement item = rows.getItem(0);
                 TableCellElement firstTD = item.getCells().getItem(0);
                 if (firstTD == null) {
                     // content is currently empty, we need to add a fake cell
                     // for measuring
                     noCells = true;
                     VScrollTableRow next = (VScrollTableRow) iterator().next();
                     boolean sorted = tHead.getHeaderCell(0) != null ? tHead
                             .getHeaderCell(0).isSorted() : false;
                     next.addCell(null, "", ALIGN_LEFT, "", true, sorted);
                     firstTD = item.getCells().getItem(0);
                 }
                 com.google.gwt.dom.client.Element wrapper = firstTD
                         .getFirstChildElement();
                 cellExtraWidth = firstTD.getOffsetWidth()
                         - wrapper.getOffsetWidth();
                 if (noCells) {
                     firstTD.getParentElement().removeChild(firstTD);
                 }
             }
         }
 
         public void moveCol(int oldIndex, int newIndex) {
 
             // loop all rows and move given index to its new place
             final Iterator<?> rows = iterator();
             while (rows.hasNext()) {
                 final VScrollTableRow row = (VScrollTableRow) rows.next();
 
                 final Element td = DOM.getChild(row.getElement(), oldIndex);
                 if (td != null) {
                     DOM.removeChild(row.getElement(), td);
 
                     DOM.insertChild(row.getElement(), td, newIndex);
                 }
             }
 
         }
 
         /**
          * Restore row visibility which is set to "none" when the row is
          * rendered (due a performance optimization).
          */
         private void restoreRowVisibility() {
             for (Widget row : renderedRows) {
                 row.getElement().getStyle().setProperty("visibility", "");
             }
         }
 
         public class VScrollTableRow extends Panel implements ActionOwner {
 
             private static final int TOUCHSCROLL_TIMEOUT = 500;
             private static final int DRAGMODE_MULTIROW = 2;
             protected ArrayList<Widget> childWidgets = new ArrayList<Widget>();
             private boolean selected = false;
             protected final int rowKey;
 
             private String[] actionKeys = null;
             private final TableRowElement rowElement;
             private int index;
             private Event touchStart;
 
             private static final int TOUCH_CONTEXT_MENU_TIMEOUT = 500;
             private Timer contextTouchTimeout;
             private Timer dragTouchTimeout;
             private int touchStartY;
             private int touchStartX;
             private TooltipInfo tooltipInfo = null;
             private Map<TableCellElement, TooltipInfo> cellToolTips = new HashMap<TableCellElement, TooltipInfo>();
             private boolean isDragging = false;
             protected String rowStyle = null;
 
             private VScrollTableRow(int rowKey) {
                 this.rowKey = rowKey;
                 rowElement = Document.get().createTRElement();
                 setElement(rowElement);
                 DOM.sinkEvents(getElement(), Event.MOUSEEVENTS
                         | Event.TOUCHEVENTS | Event.ONDBLCLICK
                         | Event.ONCONTEXTMENU | VTooltip.TOOLTIP_EVENTS);
             }
 
             public VScrollTableRow(UIDL uidl, char[] aligns) {
                 this(uidl.getIntAttribute("key"));
 
                 /*
                  * Rendering the rows as hidden improves Firefox and Safari
                  * performance drastically.
                  */
                 getElement().getStyle().setProperty("visibility", "hidden");
 
                 rowStyle = uidl.getStringAttribute("rowstyle");
                 updateStyleNames(VScrollTablePatched.this.getStylePrimaryName());
 
                 String rowDescription = uidl.getStringAttribute("rowdescr");
                 if (rowDescription != null && !rowDescription.equals("")) {
                     tooltipInfo = new TooltipInfo(rowDescription);
                 } else {
                     tooltipInfo = null;
                 }
 
                 tHead.getColumnAlignments();
                 int col = 0;
                 int visibleColumnIndex = -1;
 
                 // row header
                 if (showRowHeaders) {
                     boolean sorted = tHead.getHeaderCell(col).isSorted();
                     addCell(uidl, buildCaptionHtmlSnippet(uidl), aligns[col++],
                             "rowheader", true, sorted);
                     visibleColumnIndex++;
                 }
 
                 if (uidl.hasAttribute("al")) {
                     actionKeys = uidl.getStringArrayAttribute("al");
                 }
 
                 addCellsFromUIDL(uidl, aligns, col, visibleColumnIndex);
 
                 if (uidl.hasAttribute("selected") && !isSelected()) {
                     toggleSelection();
                 }
             }
 
             protected void updateStyleNames(String primaryStyleName) {
 
                 if (getStylePrimaryName().contains("odd")) {
                     setStyleName(primaryStyleName + "-row-odd");
                 } else {
                     setStyleName(primaryStyleName + "-row");
                 }
 
                 if (rowStyle != null) {
                     addStyleName(primaryStyleName + "-row-" + rowStyle);
                 }
 
                 for (int i = 0; i < rowElement.getChildCount(); i++) {
                     TableCellElement cell = (TableCellElement) rowElement
                             .getChild(i);
                     updateCellStyleNames(cell, primaryStyleName);
                 }
             }
 
             public TooltipInfo getTooltipInfo() {
                 return tooltipInfo;
             }
 
             /**
              * Add a dummy row, used for measurements if Table is empty.
              */
             public VScrollTableRow() {
                 this(0);
                 addCell(null, "_", 'b', "", true, false);
             }
 
             protected void initCellWidths() {
                 final int cells = tHead.getVisibleCellCount();
                 for (int i = 0; i < cells; i++) {
                     int w = VScrollTablePatched.this.getColWidth(getColKeyByIndex(i));
                     if (w < 0) {
                         w = 0;
                     }
                     setCellWidth(i, w);
                 }
             }
 
             protected void setCellWidth(int cellIx, int width) {
                 final Element cell = DOM.getChild(getElement(), cellIx);
                 Style wrapperStyle = cell.getFirstChildElement().getStyle();
                 int wrapperWidth = width;
                 if (BrowserInfo.get().isWebkit()
                         || BrowserInfo.get().isOpera10()) {
                     /*
                      * Some versions of Webkit and Opera ignore the width
                      * definition of zero width table cells. Instead, use 1px
                      * and compensate with a negative margin.
                      */
                     if (width == 0) {
                         wrapperWidth = 1;
                         wrapperStyle.setMarginRight(-1, Unit.PX);
                     } else {
                         wrapperStyle.clearMarginRight();
                     }
                 }
                 wrapperStyle.setPropertyPx("width", wrapperWidth);
                 cell.getStyle().setPropertyPx("width", width);
             }
 
             protected void addCellsFromUIDL(UIDL uidl, char[] aligns, int col,
                     int visibleColumnIndex) {
                 final Iterator<?> cells = uidl.getChildIterator();
                 while (cells.hasNext()) {
                     final Object cell = cells.next();
                     visibleColumnIndex++;
 
                     String columnId = visibleColOrder[visibleColumnIndex];
 
                     String style = "";
                     if (uidl.hasAttribute("style-" + columnId)) {
                         style = uidl.getStringAttribute("style-" + columnId);
                     }
 
                     String description = null;
                     if (uidl.hasAttribute("descr-" + columnId)) {
                         description = uidl.getStringAttribute("descr-"
                                 + columnId);
                     }
 
                     boolean sorted = tHead.getHeaderCell(col).isSorted();
                     if (cell instanceof String) {
                         addCell(uidl, cell.toString(), aligns[col++], style,
                                 isRenderHtmlInCells(), sorted, description);
                     } else {
                         final ComponentConnector cellContent = client
                                 .getPaintable((UIDL) cell);
 
                         addCell(uidl, cellContent.getWidget(), aligns[col++],
                                 style, sorted, description);
                     }
                 }
             }
 
             /**
              * Overriding this and returning true causes all text cells to be
              * rendered as HTML.
              * 
              * @return always returns false in the default implementation
              */
             protected boolean isRenderHtmlInCells() {
                 return false;
             }
 
             /**
              * Detects whether row is visible in tables viewport.
              * 
              * @return
              */
             public boolean isInViewPort() {
                 int absoluteTop = getAbsoluteTop();
                 int scrollPosition = scrollBodyPanel.getAbsoluteTop()
                         + scrollBodyPanel.getScrollPosition();
                 if (absoluteTop < scrollPosition) {
                     return false;
                 }
                 int maxVisible = scrollPosition
                         + scrollBodyPanel.getOffsetHeight() - getOffsetHeight();
                 if (absoluteTop > maxVisible) {
                     return false;
                 }
                 return true;
             }
 
             /**
              * Makes a check based on indexes whether the row is before the
              * compared row.
              * 
              * @param row1
              * @return true if this rows index is smaller than in the row1
              */
             public boolean isBefore(VScrollTableRow row1) {
                 return getIndex() < row1.getIndex();
             }
 
             /**
              * Sets the index of the row in the whole table. Currently used just
              * to set even/odd classname
              * 
              * @param indexInWholeTable
              */
             private void setIndex(int indexInWholeTable) {
                 index = indexInWholeTable;
                 boolean isOdd = indexInWholeTable % 2 == 0;
                 // Inverted logic to be backwards compatible with earlier 6.4.
                 // It is very strange because rows 1,3,5 are considered "even"
                 // and 2,4,6 "odd".
                 //
                 // First remove any old styles so that both styles aren't
                 // applied when indexes are updated.
                 String primaryStyleName = getStylePrimaryName();
                 if (primaryStyleName != null && !primaryStyleName.equals("")) {
                     removeStyleName(getStylePrimaryName());
                 }
                 if (!isOdd) {
                     addStyleName(VScrollTablePatched.this.getStylePrimaryName()
                             + "-row-odd");
                 } else {
                     addStyleName(VScrollTablePatched.this.getStylePrimaryName()
                             + "-row");
                 }
             }
 
             public int getIndex() {
                 return index;
             }
 
             @Override
             protected void onDetach() {
                 super.onDetach();
                 client.getContextMenu().ensureHidden(this);
             }
 
             public String getKey() {
                 return String.valueOf(rowKey);
             }
 
             public void addCell(UIDL rowUidl, String text, char align,
                     String style, boolean textIsHTML, boolean sorted) {
                 addCell(rowUidl, text, align, style, textIsHTML, sorted, null);
             }
 
             public void addCell(UIDL rowUidl, String text, char align,
                     String style, boolean textIsHTML, boolean sorted,
                     String description) {
                 // String only content is optimized by not using Label widget
                 final TableCellElement td = DOM.createTD().cast();
                 initCellWithText(text, align, style, textIsHTML, sorted,
                         description, td);
             }
 
             protected void initCellWithText(String text, char align,
                     String style, boolean textIsHTML, boolean sorted,
                     String description, final TableCellElement td) {
                 final Element container = DOM.createDiv();
                 container.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-cell-wrapper");
 
                 td.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-cell-content");
 
                 if (style != null && !style.equals("")) {
                     td.addClassName(VScrollTablePatched.this.getStylePrimaryName()
                             + "-cell-content-" + style);
                 }
 
                 if (sorted) {
                     td.addClassName(VScrollTablePatched.this.getStylePrimaryName()
                             + "-cell-content-sorted");
                 }
 
                 if (textIsHTML) {
                     container.setInnerHTML(text);
                 } else {
                     container.setInnerText(text);
                 }
                 if (align != ALIGN_LEFT) {
                     switch (align) {
                     case ALIGN_CENTER:
                         container.getStyle().setProperty("textAlign", "center");
                         break;
                     case ALIGN_RIGHT:
                     default:
                         container.getStyle().setProperty("textAlign", "right");
                         break;
                     }
                 }
                 setTooltip(td, description);
 
                 td.appendChild(container);
                 getElement().appendChild(td);
             }
 
             protected void updateCellStyleNames(TableCellElement td,
                     String primaryStyleName) {
                 Element container = td.getFirstChild().cast();
                 container.setClassName(primaryStyleName + "-cell-wrapper");
 
                 /*
                  * Replace old primary style name with new one
                  */
                 String className = td.getClassName();
                 String oldPrimaryName = className.split("-cell-content")[0];
                 td.setClassName(className.replaceAll(oldPrimaryName,
                         primaryStyleName));
             }
 
             public void addCell(UIDL rowUidl, Widget w, char align,
                     String style, boolean sorted, String description) {
                 final TableCellElement td = DOM.createTD().cast();
                 initCellWithWidget(w, align, style, sorted, td);
                 setTooltip(td, description);
             }
 
             private void setTooltip(TableCellElement td, String description) {
                 if (description != null && !description.equals("")) {
                     TooltipInfo info = new TooltipInfo(description);
                     cellToolTips.put(td, info);
                 } else {
                     cellToolTips.remove(td);
                 }
 
             }
 
             protected void initCellWithWidget(Widget w, char align,
                     String style, boolean sorted, final TableCellElement td) {
                 final Element container = DOM.createDiv();
                 String className = VScrollTablePatched.this.getStylePrimaryName()
                         + "-cell-content";
                 if (style != null && !style.equals("")) {
                     className += " " + VScrollTablePatched.this.getStylePrimaryName()
                             + "-cell-content-" + style;
                 }
                 if (sorted) {
                     className += " " + VScrollTablePatched.this.getStylePrimaryName()
                             + "-cell-content-sorted";
                 }
                 td.setClassName(className);
                 container.setClassName(VScrollTablePatched.this.getStylePrimaryName()
                         + "-cell-wrapper");
                 // TODO most components work with this, but not all (e.g.
                 // Select)
                 // Old comment: make widget cells respect align.
                 // text-align:center for IE, margin: auto for others
                 if (align != ALIGN_LEFT) {
                     switch (align) {
                     case ALIGN_CENTER:
                         container.getStyle().setProperty("textAlign", "center");
                         break;
                     case ALIGN_RIGHT:
                     default:
                         container.getStyle().setProperty("textAlign", "right");
                         break;
                     }
                 }
                 td.appendChild(container);
                 getElement().appendChild(td);
                 // ensure widget not attached to another element (possible tBody
                 // change)
                 w.removeFromParent();
                 container.appendChild(w.getElement());
                 adopt(w);
                 childWidgets.add(w);
             }
 
             @Override
             public Iterator<Widget> iterator() {
                 return childWidgets.iterator();
             }
 
             @Override
             public boolean remove(Widget w) {
                 if (childWidgets.contains(w)) {
                     orphan(w);
                     DOM.removeChild(DOM.getParent(w.getElement()),
                             w.getElement());
                     childWidgets.remove(w);
                     return true;
                 } else {
                     return false;
                 }
             }
 
             /**
              * If there are registered click listeners, sends a click event and
              * returns true. Otherwise, does nothing and returns false.
              * 
              * @param event
              * @param targetTdOrTr
              * @param immediate
              *            Whether the event is sent immediately
              * @return Whether a click event was sent
              */
             private boolean handleClickEvent(Event event, Element targetTdOrTr,
                     boolean immediate) {
                 if (!client.hasEventListeners(VScrollTablePatched.this,
                         TableConstants.ITEM_CLICK_EVENT_ID)) {
                     // Don't send an event if nobody is listening
                     return false;
                 }
 
                 // This row was clicked
                 client.updateVariable(paintableId, "clickedKey", "" + rowKey,
                         false);
 
                 if (getElement() == targetTdOrTr.getParentElement()) {
                     // A specific column was clicked
                     int childIndex = DOM.getChildIndex(getElement(),
                             targetTdOrTr);
                     String colKey = null;
                     colKey = tHead.getHeaderCell(childIndex).getColKey();
                     client.updateVariable(paintableId, "clickedColKey", colKey,
                             false);
                 }
 
                 MouseEventDetails details = MouseEventDetailsBuilder
                         .buildMouseEventDetails(event);
 
                 client.updateVariable(paintableId, "clickEvent",
                         details.toString(), immediate);
 
                 return true;
             }
 
             public TooltipInfo getTooltip(
                     com.google.gwt.dom.client.Element target) {
 
                 TooltipInfo info = null;
                 final Element targetTdOrTr = getTdOrTr((Element) target.cast());
                 if (targetTdOrTr != null
                         && "td".equals(targetTdOrTr.getTagName().toLowerCase())) {
                     TableCellElement td = (TableCellElement) targetTdOrTr
                             .cast();
                     info = cellToolTips.get(td);
                 }
 
                 if (info == null) {
                     info = tooltipInfo;
                 }
 
                 return info;
             }
 
             private Element getTdOrTr(Element target) {
                 Element thisTrElement = getElement();
                 if (target == thisTrElement) {
                     // This was a on the TR element
                     return target;
                 }
 
                 // Iterate upwards until we find the TR element
                 Element element = target;
                 while (element != null
                         && element.getParentElement().cast() != thisTrElement) {
                     element = element.getParentElement().cast();
                 }
                 return element;
             }
 
             /**
              * Special handler for touch devices that support native scrolling
              * 
              * @return Whether the event was handled by this method.
              */
             private boolean handleTouchEvent(final Event event) {
 
                 boolean touchEventHandled = false;
 
                 if (enabled && hasNativeTouchScrolling) {
                     final Element targetTdOrTr = getEventTargetTdOrTr(event);
                     final int type = event.getTypeInt();
 
                     switch (type) {
                     case Event.ONTOUCHSTART:
                         touchEventHandled = true;
                         touchStart = event;
                         isDragging = false;
                         Touch touch = event.getChangedTouches().get(0);
                         // save position to fields, touches in events are same
                         // instance during the operation.
                         touchStartX = touch.getClientX();
                         touchStartY = touch.getClientY();
 
                         if (dragmode != 0) {
                             if (dragTouchTimeout == null) {
                                 dragTouchTimeout = new Timer() {
 
                                     @Override
                                     public void run() {
                                         if (touchStart != null) {
                                             // Start a drag if a finger is held
                                             // in place long enough, then moved
                                             isDragging = true;
                                         }
                                     }
                                 };
                             }
                             dragTouchTimeout.schedule(TOUCHSCROLL_TIMEOUT);
                         }
 
                         if (actionKeys != null) {
                             if (contextTouchTimeout == null) {
                                 contextTouchTimeout = new Timer() {
 
                                     @Override
                                     public void run() {
                                         if (touchStart != null) {
                                             // Open the context menu if finger
                                             // is held in place long enough.
                                             showContextMenu(touchStart);
                                             event.preventDefault();
                                             touchStart = null;
                                         }
                                     }
                                 };
                             }
                             contextTouchTimeout
                                     .schedule(TOUCH_CONTEXT_MENU_TIMEOUT);
                         }
                         break;
                     case Event.ONTOUCHMOVE:
                         touchEventHandled = true;
                         if (isSignificantMove(event)) {
                             if (contextTouchTimeout != null) {
                                 // Moved finger before the context menu timer
                                 // expired, so let the browser handle this as a
                                 // scroll.
                                 contextTouchTimeout.cancel();
                                 contextTouchTimeout = null;
                             }
                             if (!isDragging && dragTouchTimeout != null) {
                                 // Moved finger before the drag timer expired,
                                 // so let the browser handle this as a scroll.
                                 dragTouchTimeout.cancel();
                                 dragTouchTimeout = null;
                             }
 
                             if (dragmode != 0 && touchStart != null
                                     && isDragging) {
                                 event.preventDefault();
                                 event.stopPropagation();
                                 startRowDrag(touchStart, type, targetTdOrTr);
                             }
                             touchStart = null;
                         }
                         break;
                     case Event.ONTOUCHEND:
                     case Event.ONTOUCHCANCEL:
                         touchEventHandled = true;
                         if (contextTouchTimeout != null) {
                             contextTouchTimeout.cancel();
                         }
                         if (dragTouchTimeout != null) {
                             dragTouchTimeout.cancel();
                         }
                         if (touchStart != null) {
                             if (!BrowserInfo.get().isAndroid()) {
                                 event.preventDefault();
                                 event.stopPropagation();
                                 Util.simulateClickFromTouchEvent(touchStart,
                                         this);
                             }
                             touchStart = null;
                         }
                         isDragging = false;
                         break;
                     }
                 }
                 return touchEventHandled;
             }
 
             /*
              * React on click that occur on content cells only
              */
 
             @Override
             public void onBrowserEvent(final Event event) {
 
                 final boolean touchEventHandled = handleTouchEvent(event);
 
                 if (enabled && !touchEventHandled) {
                     final int type = event.getTypeInt();
                     final Element targetTdOrTr = getEventTargetTdOrTr(event);
                     if (type == Event.ONCONTEXTMENU) {
                         showContextMenu(event);
                         if (enabled
                                 && (actionKeys != null || client
                                         .hasEventListeners(
                                                 VScrollTablePatched.this,
                                                 TableConstants.ITEM_CLICK_EVENT_ID))) {
                             /*
                              * Prevent browser context menu only if there are
                              * action handlers or item click listeners
                              * registered
                              */
                             event.stopPropagation();
                             event.preventDefault();
                         }
                         return;
                     }
 
                     boolean targetCellOrRowFound = targetTdOrTr != null;
 
                     switch (type) {
                     case Event.ONDBLCLICK:
                         if (targetCellOrRowFound) {
                             handleClickEvent(event, targetTdOrTr, true);
                         }
                         break;
                     case Event.ONMOUSEUP:
                         if (targetCellOrRowFound) {
                             /*
                              * Queue here, send at the same time as the
                              * corresponding value change event - see #7127
                              */
                             boolean clickEventSent = handleClickEvent(event,
                                     targetTdOrTr, false);
 
                             if (event.getButton() == Event.BUTTON_LEFT
                                     && isSelectable()) {
 
                                 // Ctrl+Shift click
                                 if ((event.getCtrlKey() || event.getMetaKey())
                                         && event.getShiftKey()
                                         && isMultiSelectModeDefault()) {
                                     toggleShiftSelection(false);
                                     setRowFocus(this);
 
                                     // Ctrl click
                                 } else if ((event.getCtrlKey() || event
                                         .getMetaKey())
                                         && isMultiSelectModeDefault()) {
                                     boolean wasSelected = isSelected();
                                     toggleSelection();
                                     setRowFocus(this);
                                     /*
                                      * next possible range select must start on
                                      * this row
                                      */
                                     selectionRangeStart = this;
                                     if (wasSelected) {
                                         removeRowFromUnsentSelectionRanges(this);
                                     }
 
                                 } else if ((event.getCtrlKey() || event
                                         .getMetaKey()) && isSingleSelectMode()) {
                                     // Ctrl (or meta) click (Single selection)
                                     if (!isSelected()
                                             || (isSelected() && nullSelectionAllowed)) {
 
                                         if (!isSelected()) {
                                             deselectAll();
                                         }
 
                                         toggleSelection();
                                         setRowFocus(this);
                                     }
 
                                 } else if (event.getShiftKey()
                                         && isMultiSelectModeDefault()) {
                                     // Shift click
                                     toggleShiftSelection(true);
 
                                 } else {
                                     // click
                                     boolean currentlyJustThisRowSelected = selectedRowKeys
                                             .size() == 1
                                             && selectedRowKeys
                                                     .contains(getKey());
 
                                     if (!currentlyJustThisRowSelected) {
                                         if (isSingleSelectMode()
                                                 || isMultiSelectModeDefault()) {
                                             /*
                                              * For default multi select mode
                                              * (ctrl/shift) and for single
                                              * select mode we need to clear the
                                              * previous selection before
                                              * selecting a new one when the user
                                              * clicks on a row. Only in
                                              * multiselect/simple mode the old
                                              * selection should remain after a
                                              * normal click.
                                              */
                                             deselectAll();
                                         }
                                         toggleSelection();
                                     } else if ((isSingleSelectMode() || isMultiSelectModeSimple())
                                             && nullSelectionAllowed) {
                                         toggleSelection();
                                     }/*
                                       * else NOP to avoid excessive server
                                       * visits (selection is removed with
                                       * CTRL/META click)
                                       */
 
                                     selectionRangeStart = this;
                                     setRowFocus(this);
                                 }
 
                                 // Remove IE text selection hack
                                 if (BrowserInfo.get().isIE()) {
                                     ((Element) event.getEventTarget().cast())
                                             .setPropertyJSO("onselectstart",
                                                     null);
                                 }
                                 // Queue value change
                                 sendSelectedRows(false);
                             }
                             /*
                              * Send queued click and value change events if any
                              * If a click event is sent, send value change with
                              * it regardless of the immediate flag, see #7127
                              */
                             if (immediate || clickEventSent) {
                                 client.sendPendingVariableChanges();
                             }
                         }
                         break;
                     case Event.ONTOUCHEND:
                     case Event.ONTOUCHCANCEL:
                         if (touchStart != null) {
                             /*
                              * Touch has not been handled as neither context or
                              * drag start, handle it as a click.
                              */
                             Util.simulateClickFromTouchEvent(touchStart, this);
                             touchStart = null;
                         }
                         if (contextTouchTimeout != null) {
                             contextTouchTimeout.cancel();
                         }
                         break;
                     case Event.ONTOUCHMOVE:
                         if (isSignificantMove(event)) {
                             /*
                              * TODO figure out scroll delegate don't eat events
                              * if row is selected. Null check for active
                              * delegate is as a workaround.
                              */
                             if (dragmode != 0
                                     && touchStart != null
                                     && (TouchScrollDelegate
                                             .getActiveScrollDelegate() == null)) {
                                 startRowDrag(touchStart, type, targetTdOrTr);
                             }
                             if (contextTouchTimeout != null) {
                                 contextTouchTimeout.cancel();
                             }
                             /*
                              * Avoid clicks and drags by clearing touch start
                              * flag.
                              */
                             touchStart = null;
                         }
 
                         break;
                     case Event.ONTOUCHSTART:
                         touchStart = event;
                         Touch touch = event.getChangedTouches().get(0);
                         // save position to fields, touches in events are same
                         // isntance during the operation.
                         touchStartX = touch.getClientX();
                         touchStartY = touch.getClientY();
                         /*
                          * Prevent simulated mouse events.
                          */
                         touchStart.preventDefault();
                         if (dragmode != 0 || actionKeys != null) {
                             new Timer() {
 
                                 @Override
                                 public void run() {
                                     TouchScrollDelegate activeScrollDelegate = TouchScrollDelegate
                                             .getActiveScrollDelegate();
                                     /*
                                      * If there's a scroll delegate, check if
                                      * we're actually scrolling and handle it.
                                      * If no delegate, do nothing here and let
                                      * the row handle potential drag'n'drop or
                                      * context menu.
                                      */
                                     if (activeScrollDelegate != null) {
                                         if (activeScrollDelegate.isMoved()) {
                                             /*
                                              * Prevent the row from handling
                                              * touch move/end events (the
                                              * delegate handles those) and from
                                              * doing drag'n'drop or opening a
                                              * context menu.
                                              */
                                             touchStart = null;
                                         } else {
                                             /*
                                              * Scrolling hasn't started, so
                                              * cancel delegate and let the row
                                              * handle potential drag'n'drop or
                                              * context menu.
                                              */
                                             activeScrollDelegate
                                                     .stopScrolling();
                                         }
                                     }
                                 }
                             }.schedule(TOUCHSCROLL_TIMEOUT);
 
                             if (contextTouchTimeout == null
                                     && actionKeys != null) {
                                 contextTouchTimeout = new Timer() {
 
                                     @Override
                                     public void run() {
                                         if (touchStart != null) {
                                             showContextMenu(touchStart);
                                             touchStart = null;
                                         }
                                     }
                                 };
                             }
                             if (contextTouchTimeout != null) {
                                 contextTouchTimeout.cancel();
                                 contextTouchTimeout
                                         .schedule(TOUCH_CONTEXT_MENU_TIMEOUT);
                             }
                         }
                         break;
                     case Event.ONMOUSEDOWN:
                         if (targetCellOrRowFound) {
                             setRowFocus(this);
                             ensureFocus();
                             if (dragmode != 0
                                     && (event.getButton() == NativeEvent.BUTTON_LEFT)) {
                                 startRowDrag(event, type, targetTdOrTr);
 
                             } else if (event.getCtrlKey()
                                     || event.getShiftKey()
                                     || event.getMetaKey()
                                     && isMultiSelectModeDefault()) {
 
                                 // Prevent default text selection in Firefox
                                 event.preventDefault();
 
                                 // Prevent default text selection in IE
                                 if (BrowserInfo.get().isIE()) {
                                     ((Element) event.getEventTarget().cast())
                                             .setPropertyJSO(
                                                     "onselectstart",
                                                     getPreventTextSelectionIEHack());
                                 }
 
                                 event.stopPropagation();
                             }
                         }
                         break;
                     case Event.ONMOUSEOUT:
                         break;
                     default:
                         break;
                     }
                 }
                 super.onBrowserEvent(event);
             }
 
             private boolean isSignificantMove(Event event) {
                 if (touchStart == null) {
                     // no touch start
                     return false;
                 }
                 /*
                  * TODO calculate based on real distance instead of separate
                  * axis checks
                  */
                 Touch touch = event.getChangedTouches().get(0);
                 if (Math.abs(touch.getClientX() - touchStartX) > TouchScrollDelegate.SIGNIFICANT_MOVE_THRESHOLD) {
                     return true;
                 }
                 if (Math.abs(touch.getClientY() - touchStartY) > TouchScrollDelegate.SIGNIFICANT_MOVE_THRESHOLD) {
                     return true;
                 }
                 return false;
             }
 
             /**
              * Checks if the row represented by the row key has been selected
              * 
              * @param key
              *            The generated row key
              */
             private boolean rowKeyIsSelected(int rowKey) {
                 // Check single selections
                 if (selectedRowKeys.contains("" + rowKey)) {
                     return true;
                 }
 
                 // Check range selections
                 for (SelectionRange r : selectedRowRanges) {
                     if (r.inRange(getRenderedRowByKey("" + rowKey))) {
                         return true;
                     }
                 }
                 return false;
             }
 
             protected void startRowDrag(Event event, final int type,
                     Element targetTdOrTr) {
                 VTransferable transferable = new VTransferable();
                 transferable.setDragSource(ConnectorMap.get(client)
                         .getConnector(VScrollTablePatched.this));
                 transferable.setData("itemId", "" + rowKey);
                 NodeList<TableCellElement> cells = rowElement.getCells();
                 for (int i = 0; i < cells.getLength(); i++) {
                     if (cells.getItem(i).isOrHasChild(targetTdOrTr)) {
                         HeaderCell headerCell = tHead.getHeaderCell(i);
                         transferable.setData("propertyId", headerCell.cid);
                         break;
                     }
                 }
 
                 VDragEvent ev = VDragAndDropManager.get().startDrag(
                         transferable, event, true);
                 if (dragmode == DRAGMODE_MULTIROW && isMultiSelectModeAny()
                         && rowKeyIsSelected(rowKey)) {
 
                     // Create a drag image of ALL rows
                     ev.createDragImage(
                             (Element) scrollBody.tBodyElement.cast(), true);
 
                     // Hide rows which are not selected
                     Element dragImage = ev.getDragImage();
                     int i = 0;
                     for (Iterator<Widget> iterator = scrollBody.iterator(); iterator
                             .hasNext();) {
                         VScrollTableRow next = (VScrollTableRow) iterator
                                 .next();
 
                         Element child = (Element) dragImage.getChild(i++);
 
                         if (!rowKeyIsSelected(next.rowKey)) {
                             child.getStyle().setVisibility(Visibility.HIDDEN);
                         }
                     }
                 } else {
                     ev.createDragImage(getElement(), true);
                 }
                 if (type == Event.ONMOUSEDOWN) {
                     event.preventDefault();
                 }
                 event.stopPropagation();
             }
 
             /**
              * Finds the TD that the event interacts with. Returns null if the
              * target of the event should not be handled. If the event target is
              * the row directly this method returns the TR element instead of
              * the TD.
              * 
              * @param event
              * @return TD or TR element that the event targets (the actual event
              *         target is this element or a child of it)
              */
             private Element getEventTargetTdOrTr(Event event) {
                 final Element eventTarget = event.getEventTarget().cast();
                 Widget widget = Util.findWidget(eventTarget, null);
                 final Element thisTrElement = getElement();
 
                 if (widget != this) {
                     /*
                      * This is a workaround to make Labels, read only TextFields
                      * and Embedded in a Table clickable (see #2688). It is
                      * really not a fix as it does not work with a custom read
                      * only components (not extending VLabel/VEmbedded).
                      */
                     while (widget != null && widget.getParent() != this) {
                         widget = widget.getParent();
                     }
 
                     if (!(widget instanceof VLabel)
                             && !(widget instanceof VEmbedded)
                             && !(widget instanceof VTextField && ((VTextField) widget)
                                     .isReadOnly())) {
                         return null;
                     }
                 }
                 return getTdOrTr(eventTarget);
             }
 
             public void showContextMenu(Event event) {
                 if (enabled && actionKeys != null) {
                     // Show context menu if there are registered action handlers
                     int left = Util.getTouchOrMouseClientX(event)
                             + Window.getScrollLeft();
                     int top = Util.getTouchOrMouseClientY(event)
                             + Window.getScrollTop();
                     showContextMenu(left, top);
                 }
             }
 
             public void showContextMenu(int left, int top) {
                 VContextMenu menu = client.getContextMenu();
                 contextMenu = new ContextMenuDetails(menu, getKey(), left, top);
                 menu.showAt(this, left, top);
             }
 
             /**
              * Has the row been selected?
              * 
              * @return Returns true if selected, else false
              */
             public boolean isSelected() {
                 return selected;
             }
 
             /**
              * Toggle the selection of the row
              */
             public void toggleSelection() {
                 selected = !selected;
                 selectionChanged = true;
                 if (selected) {
                     selectedRowKeys.add(String.valueOf(rowKey));
                     addStyleName("v-selected");
                 } else {
                     removeStyleName("v-selected");
                     selectedRowKeys.remove(String.valueOf(rowKey));
                 }
             }
 
             /**
              * Is called when a user clicks an item when holding SHIFT key down.
              * This will select a new range from the last focused row
              * 
              * @param deselectPrevious
              *            Should the previous selected range be deselected
              */
             private void toggleShiftSelection(boolean deselectPrevious) {
 
                 /*
                  * Ensures that we are in multiselect mode and that we have a
                  * previous selection which was not a deselection
                  */
                 if (isSingleSelectMode()) {
                     // No previous selection found
                     deselectAll();
                     toggleSelection();
                     return;
                 }
 
                 // Set the selectable range
                 VScrollTableRow endRow = this;
                 VScrollTableRow startRow = selectionRangeStart;
                 if (startRow == null) {
                     startRow = focusedRow;
                     // If start row is null then we have a multipage selection
                     // from
                     // above
                     if (startRow == null) {
                         startRow = (VScrollTableRow) scrollBody.iterator()
                                 .next();
                         setRowFocus(endRow);
                     }
                 } else if (!startRow.isSelected()) {
                     // The start row is no longer selected (probably removed)
                     // and so we select from above
                     startRow = (VScrollTableRow) scrollBody.iterator().next();
                     setRowFocus(endRow);
                 }
 
                 // Deselect previous items if so desired
                 if (deselectPrevious) {
                     deselectAll();
                 }
 
                 // we'll ensure GUI state from top down even though selection
                 // was the opposite way
                 if (!startRow.isBefore(endRow)) {
                     VScrollTableRow tmp = startRow;
                     startRow = endRow;
                     endRow = tmp;
                 }
                 SelectionRange range = new SelectionRange(startRow, endRow);
 
                 for (Widget w : scrollBody) {
                     VScrollTableRow row = (VScrollTableRow) w;
                     if (range.inRange(row)) {
                         if (!row.isSelected()) {
                             row.toggleSelection();
                         }
                         selectedRowKeys.add(row.getKey());
                     }
                 }
 
                 // Add range
                 if (startRow != endRow) {
                     selectedRowRanges.add(range);
                 }
             }
 
             /*
              * (non-Javadoc)
              * 
              * @see com.vaadin.client.ui.IActionOwner#getActions ()
              */
 
             @Override
             public Action[] getActions() {
                 if (actionKeys == null) {
                     return new Action[] {};
                 }
                 final Action[] actions = new Action[actionKeys.length];
                 for (int i = 0; i < actions.length; i++) {
                     final String actionKey = actionKeys[i];
                     final TreeAction a = new TreeAction(this,
                             String.valueOf(rowKey), actionKey) {
 
                         @Override
                         public void execute() {
                             super.execute();
                             lazyRevertFocusToRow(VScrollTableRow.this);
                         }
                     };
                     a.setCaption(getActionCaption(actionKey));
                     a.setIconUrl(getActionIcon(actionKey));
                     actions[i] = a;
                 }
                 return actions;
             }
 
             @Override
             public ApplicationConnection getClient() {
                 return client;
             }
 
             @Override
             public String getPaintableId() {
                 return paintableId;
             }
 
             private int getColIndexOf(Widget child) {
                 com.google.gwt.dom.client.Element widgetCell = child
                         .getElement().getParentElement().getParentElement();
                 NodeList<TableCellElement> cells = rowElement.getCells();
                 for (int i = 0; i < cells.getLength(); i++) {
                     if (cells.getItem(i) == widgetCell) {
                         return i;
                     }
                 }
                 return -1;
             }
 
             public Widget getWidgetForPaintable() {
                 return this;
             }
         }
 
         protected class VScrollTableGeneratedRow extends VScrollTableRow {
 
             private boolean spanColumns;
             private boolean htmlContentAllowed;
 
             public VScrollTableGeneratedRow(UIDL uidl, char[] aligns) {
                 super(uidl, aligns);
                 addStyleName("v-table-generated-row");
             }
 
             public boolean isSpanColumns() {
                 return spanColumns;
             }
 
             @Override
             protected void initCellWidths() {
                 if (spanColumns) {
                     setSpannedColumnWidthAfterDOMFullyInited();
                 } else {
                     super.initCellWidths();
                 }
             }
 
             private void setSpannedColumnWidthAfterDOMFullyInited() {
                 // Defer setting width on spanned columns to make sure that
                 // they are added to the DOM before trying to calculate
                 // widths.
                 Scheduler.get().scheduleDeferred(new ScheduledCommand() {
 
                     @Override
                     public void execute() {
                         if (showRowHeaders) {
                             setCellWidth(0, tHead.getHeaderCell(0)
                                     .getWidthWithIndent());
                             calcAndSetSpanWidthOnCell(1);
                         } else {
                             calcAndSetSpanWidthOnCell(0);
                         }
                     }
                 });
             }
 
             @Override
             protected boolean isRenderHtmlInCells() {
                 return htmlContentAllowed;
             }
 
             @Override
             protected void addCellsFromUIDL(UIDL uidl, char[] aligns, int col,
                     int visibleColumnIndex) {
                 htmlContentAllowed = uidl.getBooleanAttribute("gen_html");
                 spanColumns = uidl.getBooleanAttribute("gen_span");
 
                 final Iterator<?> cells = uidl.getChildIterator();
                 if (spanColumns) {
                     int colCount = uidl.getChildCount();
                     if (cells.hasNext()) {
                         final Object cell = cells.next();
                         if (cell instanceof String) {
                             addSpannedCell(uidl, cell.toString(), aligns[0],
                                     "", htmlContentAllowed, false, null,
                                     colCount);
                         } else {
                             addSpannedCell(uidl, (Widget) cell, aligns[0], "",
                                     false, colCount);
                         }
                     }
                 } else {
                     super.addCellsFromUIDL(uidl, aligns, col,
                             visibleColumnIndex);
                 }
             }
 
             private void addSpannedCell(UIDL rowUidl, Widget w, char align,
                     String style, boolean sorted, int colCount) {
                 TableCellElement td = DOM.createTD().cast();
                 td.setColSpan(colCount);
                 initCellWithWidget(w, align, style, sorted, td);
             }
 
             private void addSpannedCell(UIDL rowUidl, String text, char align,
                     String style, boolean textIsHTML, boolean sorted,
                     String description, int colCount) {
                 // String only content is optimized by not using Label widget
                 final TableCellElement td = DOM.createTD().cast();
                 td.setColSpan(colCount);
                 initCellWithText(text, align, style, textIsHTML, sorted,
                         description, td);
             }
 
             @Override
             protected void setCellWidth(int cellIx, int width) {
                 if (isSpanColumns()) {
                     if (showRowHeaders) {
                         if (cellIx == 0) {
                             super.setCellWidth(0, width);
                         } else {
                             // We need to recalculate the spanning TDs width for
                             // every cellIx in order to support column resizing.
                             calcAndSetSpanWidthOnCell(1);
                         }
                     } else {
                         // Same as above.
                         calcAndSetSpanWidthOnCell(0);
                     }
                 } else {
                     super.setCellWidth(cellIx, width);
                 }
             }
 
             private void calcAndSetSpanWidthOnCell(final int cellIx) {
                 int spanWidth = 0;
                 for (int ix = (showRowHeaders ? 1 : 0); ix < tHead
                         .getVisibleCellCount(); ix++) {
                     spanWidth += tHead.getHeaderCell(ix).getOffsetWidth();
                 }
                 Util.setWidthExcludingPaddingAndBorder((Element) getElement()
                         .getChild(cellIx), spanWidth, 13, false);
             }
         }
 
         /**
          * Ensure the component has a focus.
          * 
          * TODO the current implementation simply always calls focus for the
          * component. In case the Table at some point implements focus/blur
          * listeners, this method needs to be evolved to conditionally call
          * focus only if not currently focused.
          */
         protected void ensureFocus() {
             if (!hasFocus) {
                 scrollBodyPanel.setFocus(true);
             }
 
         }
 
     }
 
     /**
      * Deselects all items
      */
     public void deselectAll() {
         for (Widget w : scrollBody) {
             VScrollTableRow row = (VScrollTableRow) w;
             if (row.isSelected()) {
                 row.toggleSelection();
             }
         }
         // still ensure all selects are removed from (not necessary rendered)
         selectedRowKeys.clear();
         selectedRowRanges.clear();
         // also notify server that it clears all previous selections (the client
         // side does not know about the invisible ones)
         instructServerToForgetPreviousSelections();
     }
 
     /**
      * Used in multiselect mode when the client side knows that all selections
      * are in the next request.
      */
     private void instructServerToForgetPreviousSelections() {
         client.updateVariable(paintableId, "clearSelections", true, false);
     }
 
     /**
      * Determines the pagelength when the table height is fixed.
      */
     public void updatePageLength() {
         // Only update if visible and enabled
         if (!isVisible() || !enabled) {
             return;
         }
 
         if (scrollBody == null) {
             return;
         }
 
         if (isDynamicHeight()) {
             return;
         }
 
         int rowHeight = (int) Math.round(scrollBody.getRowHeight());
         int bodyH = scrollBodyPanel.getOffsetHeight();
         int rowsAtOnce = bodyH / rowHeight;
         boolean anotherPartlyVisible = ((bodyH % rowHeight) != 0);
         if (anotherPartlyVisible) {
             rowsAtOnce++;
         }
         if (pageLength != rowsAtOnce) {
             pageLength = rowsAtOnce;
             client.updateVariable(paintableId, "pagelength", pageLength, false);
 
             if (!rendering) {
                 int currentlyVisible = scrollBody.getLastRendered()
                         - scrollBody.getFirstRendered();
                 if (currentlyVisible < pageLength
                         && currentlyVisible < totalRows) {
                     // shake scrollpanel to fill empty space
                     scrollBodyPanel.setScrollPosition(scrollTop + 1);
                     scrollBodyPanel.setScrollPosition(scrollTop - 1);
                 }
 
                 sizeNeedsInit = true;
             }
         }
 
     }
 
     /**
      * For internal use only. May be removed or replaced in the future.
      */
     public void updateWidth() {
         if (!isVisibleInHierarchy()) {
             /*
              * Do not update size when the table is hidden as all column widths
              * will be set to zero and they won't be recalculated when the table
              * is set visible again (until the size changes again)
              */
             return;
         }
 
         if (!isDynamicWidth()) {
             int innerPixels = getOffsetWidth() - getBorderWidth();
             if (innerPixels < 0) {
                 innerPixels = 0;
             }
             setContentWidth(innerPixels);
 
             // readjust undefined width columns
             triggerLazyColumnAdjustment(false);
 
         } else {
 
             sizeNeedsInit = true;
 
             // readjust undefined width columns
             triggerLazyColumnAdjustment(false);
         }
 
         /*
          * setting width may affect wheter the component has scrollbars -> needs
          * scrolling or not
          */
         setProperTabIndex();
     }
 
     private static final int LAZY_COLUMN_ADJUST_TIMEOUT = 300;
 
     private final Timer lazyAdjustColumnWidths = new Timer() {
 
         private int formerWidth;
         private boolean formerScrolling;
 
         /**
          * Check for column widths, and available width, to see if we can fix
          * column widths "optimally". Doing this lazily to avoid expensive
          * calculation when resizing is not yet finished.
          */
 
         @Override
         public void run() {
             if (scrollBody == null || !isVisibleInHierarchy()) {
                 // Try again later if we get here before scrollBody has been
                 // initalized
                 triggerLazyColumnAdjustment(false);
                 return;
             }
 
             // MGNLUI-962 We don't want to recalculate column widths if table body's width itself hasn't changed.
             int width = scrollBody.getAvailableWidth();
             boolean scrolling = willHaveScrollbars();
             if (width != formerWidth || scrolling != formerScrolling) {
                 formerWidth = width;
                 formerScrolling = scrolling;
             } else {
                 return;
             }
 
             Iterator<Widget> headCells = tHead.iterator();
             int usedMinimumWidth = 0;
             int totalExplicitColumnsWidths = 0;
             float expandRatioDivider = 0;
             int colIndex = 0;
 
             int hierarchyColumnIndent = scrollBody.getMaxIndent();
             int hierarchyColumnIndex = getHierarchyColumnIndex();
             HeaderCell hierarchyHeaderInNeedOfFurtherHandling = null;
 
             while (headCells.hasNext()) {
                 final HeaderCell hCell = (HeaderCell) headCells.next();
                 boolean hasIndent = hierarchyColumnIndent > 0
                         && hCell.isHierarchyColumn();
                 if (hCell.isDefinedWidth()) {
                     // get width without indent to find out whether adjustments
                     // are needed (requires special handling further ahead)
                     int w = hCell.getWidth();
                     if (hasIndent && w < hierarchyColumnIndent) {
                         // enforce indent if necessary
                         w = hierarchyColumnIndent;
                         hierarchyHeaderInNeedOfFurtherHandling = hCell;
                     }
                     totalExplicitColumnsWidths += w;
                     usedMinimumWidth += w;
                 } else {
                     // natural width already includes indent if any
                     int naturalColumnWidth = hCell
                             .getNaturalColumnWidth(colIndex);
                     usedMinimumWidth += naturalColumnWidth;
                     expandRatioDivider += hCell.getExpandRatio();
                     if (hasIndent) {
                         hierarchyHeaderInNeedOfFurtherHandling = hCell;
                     }
                 }
                 colIndex++;
             }
 
             int availW = scrollBody.getAvailableWidth();
             // Hey IE, are you really sure about this?
             availW = scrollBody.getAvailableWidth();
             int visibleCellCount = tHead.getVisibleCellCount();
             int totalExtraWidth = scrollBody.getCellExtraWidth()
                     * visibleCellCount;
             if (willHaveScrollbars()) {
                 totalExtraWidth += Util.getNativeScrollbarSize();
             }
             availW -= totalExtraWidth;
             int forceScrollBodyWidth = -1;
 
             int extraSpace = availW - usedMinimumWidth;
             if (extraSpace < 0) {
                 if (getTotalRows() == 0) {
                     /*
                      * Too wide header combined with no rows in the table.
                      * 
                      * No horizontal scrollbars would be displayed because
                      * there's no rows that grows too wide causing the
                      * scrollBody container div to overflow. Must explicitely
                      * force a width to a scrollbar. (see #9187)
                      */
                     forceScrollBodyWidth = usedMinimumWidth + totalExtraWidth;
                 }
                 extraSpace = 0;
             }
 
             if (forceScrollBodyWidth > 0) {
                 scrollBody.container.getStyle().setWidth(forceScrollBodyWidth,
                         Unit.PX);
             } else {
                 // Clear width that might have been set to force horizontal
                 // scrolling if there are no rows
                 scrollBody.container.getStyle().clearWidth();
             }
 
             int totalUndefinedNaturalWidths = usedMinimumWidth
                     - totalExplicitColumnsWidths;
 
             if (hierarchyHeaderInNeedOfFurtherHandling != null
                     && !hierarchyHeaderInNeedOfFurtherHandling.isDefinedWidth()) {
                 // ensure the cell gets enough space for the indent
                 int w = hierarchyHeaderInNeedOfFurtherHandling
                         .getNaturalColumnWidth(hierarchyColumnIndex);
                 int newSpace = Math.round(w + (float) extraSpace * (float) w
                         / totalUndefinedNaturalWidths);
                 if (newSpace >= hierarchyColumnIndent) {
                     // no special handling required
                     hierarchyHeaderInNeedOfFurtherHandling = null;
                 } else {
                     // treat as a defined width column of indent's width
                     totalExplicitColumnsWidths += hierarchyColumnIndent;
                     usedMinimumWidth -= w - hierarchyColumnIndent;
                     totalUndefinedNaturalWidths = usedMinimumWidth
                             - totalExplicitColumnsWidths;
                     expandRatioDivider += hierarchyHeaderInNeedOfFurtherHandling
                             .getExpandRatio();
                     extraSpace = Math.max(availW - usedMinimumWidth, 0);
                 }
             }
 
             // we have some space that can be divided optimally
             HeaderCell hCell;
             colIndex = 0;
             headCells = tHead.iterator();
             int checksum = 0;
             while (headCells.hasNext()) {
                 hCell = (HeaderCell) headCells.next();
                 if (!hCell.isDefinedWidth()) {
                     int w = hCell.getNaturalColumnWidth(colIndex);
                     int newSpace;
                     if (expandRatioDivider > 0) {
                         // divide excess space by expand ratios
                         newSpace = Math.round((w + extraSpace
                                 * hCell.getExpandRatio() / expandRatioDivider));
                     } else {
                         if (hierarchyHeaderInNeedOfFurtherHandling == hCell) {
                             // still exists, so needs exactly the indent's width
                             newSpace = hierarchyColumnIndent;
                         } else if (totalUndefinedNaturalWidths != 0) {
                             // divide relatively to natural column widths
                             newSpace = Math.round(w + (float) extraSpace
                                     * (float) w / totalUndefinedNaturalWidths);
                         } else {
                             newSpace = w;
                         }
                     }
                     checksum += newSpace;
                     setColWidth(colIndex, newSpace, false);
 
                 } else {
                     if (hierarchyHeaderInNeedOfFurtherHandling == hCell) {
                         // defined with enforced into indent width
                         checksum += hierarchyColumnIndent;
                         setColWidth(colIndex, hierarchyColumnIndent, false);
                     } else {
                         int cellWidth = hCell.getWidthWithIndent();
                         checksum += cellWidth;
                         if (hCell.isHierarchyColumn()) {
                             // update in case the indent has changed
                             // (not detectable earlier)
                             setColWidth(colIndex, cellWidth, true);
                         }
                     }
                 }
                 colIndex++;
             }
 
             if (extraSpace > 0 && checksum != availW) {
                 /*
                  * There might be in some cases a rounding error of 1px when
                  * extra space is divided so if there is one then we give the
                  * first undefined column 1 more pixel
                  */
                 headCells = tHead.iterator();
                 colIndex = 0;
                 while (headCells.hasNext()) {
                     HeaderCell hc = (HeaderCell) headCells.next();
                     if (!hc.isDefinedWidth()) {
                         setColWidth(colIndex, hc.getWidthWithIndent() + availW
                                 - checksum, false);
                         break;
                     }
                     colIndex++;
                 }
             }
 
             if (isDynamicHeight() && totalRows == pageLength) {
                 // fix body height (may vary if lazy loading is offhorizontal
                 // scrollbar appears/disappears)
                 int bodyHeight = scrollBody.getRequiredHeight();
                 boolean needsSpaceForHorizontalScrollbar = (availW < usedMinimumWidth);
                 if (needsSpaceForHorizontalScrollbar) {
                     bodyHeight += Util.getNativeScrollbarSize();
                 }
                 int heightBefore = getOffsetHeight();
                 scrollBodyPanel.setHeight(bodyHeight + "px");
                 if (heightBefore != getOffsetHeight()) {
                     Util.notifyParentOfSizeChange(VScrollTablePatched.this, false);
                 }
             }
             Scheduler.get().scheduleDeferred(new Command() {
 
                 @Override
                 public void execute() {
                     Util.runWebkitOverflowAutoFix(scrollBodyPanel.getElement());
                 }
             });
 
             forceRealignColumnHeaders();
         }
 
     };
 
     private void forceRealignColumnHeaders() {
         if (BrowserInfo.get().isIE()) {
             /*
              * IE does not fire onscroll event if scroll position is reverted to
              * 0 due to the content element size growth. Ensure headers are in
              * sync with content manually. Safe to use null event as we don't
              * actually use the event object in listener.
              */
             onScroll(null);
         }
     }
 
     /**
      * helper to set pixel size of head and body part
      * 
      * @param pixels
      */
     private void setContentWidth(int pixels) {
         tHead.setWidth(pixels + "px");
         scrollBodyPanel.setWidth(pixels + "px");
         tFoot.setWidth(pixels + "px");
     }
 
     private int borderWidth = -1;
 
     /**
      * @return border left + border right
      */
     private int getBorderWidth() {
         if (borderWidth < 0) {
             borderWidth = Util.measureHorizontalPaddingAndBorder(
                     scrollBodyPanel.getElement(), 2);
             if (borderWidth < 0) {
                 borderWidth = 0;
             }
         }
         return borderWidth;
     }
 
     /**
      * Ensures scrollable area is properly sized. This method is used when fixed
      * size is used.
      */
     private int containerHeight;
 
     private void setContainerHeight() {
         if (!isDynamicHeight()) {
 
             /*
              * Android 2.3 cannot measure the height of the inline-block
              * properly, and will return the wrong offset height. So for android
              * 2.3 we set the element to a block element while measuring and
              * then restore it which yields the correct result. #11331
              */
             if (BrowserInfo.get().isAndroid23()) {
                 getElement().getStyle().setDisplay(Display.BLOCK);
             }
 
             containerHeight = getOffsetHeight();
             containerHeight -= showColHeaders ? tHead.getOffsetHeight() : 0;
             containerHeight -= tFoot.getOffsetHeight();
             containerHeight -= getContentAreaBorderHeight();
             if (containerHeight < 0) {
                 containerHeight = 0;
             }
 
             scrollBodyPanel.setHeight(containerHeight + "px");
 
             if (BrowserInfo.get().isAndroid23()) {
                 getElement().getStyle().clearDisplay();
             }
         }
     }
 
     private int contentAreaBorderHeight = -1;
     private int scrollLeft;
     private int scrollTop;
 
     /** For internal use only. May be removed or replaced in the future. */
     public VScrollTableDropHandler dropHandler;
 
     private boolean navKeyDown;
 
     /** For internal use only. May be removed or replaced in the future. */
     public boolean multiselectPending;
 
     /**
      * @return border top + border bottom of the scrollable area of table
      */
     private int getContentAreaBorderHeight() {
         if (contentAreaBorderHeight < 0) {
 
             DOM.setStyleAttribute(scrollBodyPanel.getElement(), "overflow",
                     "hidden");
             int oh = scrollBodyPanel.getOffsetHeight();
             int ch = scrollBodyPanel.getElement()
                     .getPropertyInt("clientHeight");
             contentAreaBorderHeight = oh - ch;
             DOM.setStyleAttribute(scrollBodyPanel.getElement(), "overflow",
                     "auto");
         }
         return contentAreaBorderHeight;
     }
 
     @Override
     public void setHeight(String height) {
         if (height.length() == 0
                 && getElement().getStyle().getHeight().length() != 0) {
             /*
              * Changing from defined to undefined size -> should do a size init
              * to take page length into account again
              */
             sizeNeedsInit = true;
         }
         super.setHeight(height);
     }
 
     /** For internal use only. May be removed or replaced in the future. */
     public void updateHeight() {
         setContainerHeight();
 
         if (initializedAndAttached) {
             updatePageLength();
         }
         if (!rendering) {
             // Webkit may sometimes get an odd rendering bug (white space
             // between header and body), see bug #3875. Running
             // overflow hack here to shake body element a bit.
             // We must run the fix as a deferred command to prevent it from
             // overwriting the scroll position with an outdated value, see
             // #7607.
             Scheduler.get().scheduleDeferred(new Command() {
 
                 @Override
                 public void execute() {
                     Util.runWebkitOverflowAutoFix(scrollBodyPanel.getElement());
                 }
             });
         }
 
         triggerLazyColumnAdjustment(false);
 
         /*
          * setting height may affect wheter the component has scrollbars ->
          * needs scrolling or not
          */
         setProperTabIndex();
 
     }
 
     /*
      * Overridden due Table might not survive of visibility change (scroll pos
      * lost). Example ITabPanel just set contained components invisible and back
      * when changing tabs.
      */
 
     @Override
     public void setVisible(boolean visible) {
         if (isVisible() != visible) {
             super.setVisible(visible);
             if (initializedAndAttached) {
                 if (visible) {
                     Scheduler.get().scheduleDeferred(new Command() {
 
                         @Override
                         public void execute() {
                             scrollBodyPanel
                                     .setScrollPosition(measureRowHeightOffset(firstRowInViewPort));
                         }
                     });
                 }
             }
         }
     }
 
     /**
      * Helper function to build html snippet for column or row headers
      * 
      * @param uidl
      *            possibly with values caption and icon
      * @return html snippet containing possibly an icon + caption text
      */
     protected String buildCaptionHtmlSnippet(UIDL uidl) {
         String s = uidl.hasAttribute("caption") ? uidl
                 .getStringAttribute("caption") : "";
         if (uidl.hasAttribute("icon")) {
             s = "<img src=\""
                     + Util.escapeAttribute(client.translateVaadinUri(uidl
                             .getStringAttribute("icon")))
                     + "\" alt=\"icon\" class=\"v-icon\">" + s;
         }
         return s;
     }
 
     /**
      * This method has logic which rows needs to be requested from server when
      * user scrolls
      */
 
     @Override
     public void onScroll(ScrollEvent event) {
         scrollLeft = scrollBodyPanel.getElement().getScrollLeft();
         scrollTop = scrollBodyPanel.getScrollPosition();
         /*
          * #6970 - IE sometimes fires scroll events for a detached table.
          * 
          * FIXME initializedAndAttached should probably be renamed - its name
          * doesn't seem to reflect its semantics. onDetach() doesn't set it to
          * false, and changing that might break something else, so we need to
          * check isAttached() separately.
          */
         if (!initializedAndAttached || !isAttached()) {
             return;
         }
         if (!enabled) {
             scrollBodyPanel
                     .setScrollPosition(measureRowHeightOffset(firstRowInViewPort));
             return;
         }
 
         rowRequestHandler.cancel();
 
         if (BrowserInfo.get().isSafari() && event != null && scrollTop == 0) {
             // due to the webkitoverflowworkaround, top may sometimes report 0
             // for webkit, although it really is not. Expecting to have the
             // correct
             // value available soon.
             Scheduler.get().scheduleDeferred(new Command() {
 
                 @Override
                 public void execute() {
                     onScroll(null);
                 }
             });
             return;
         }
 
         // fix headers horizontal scrolling
         tHead.setHorizontalScrollPosition(scrollLeft);
 
         // fix footers horizontal scrolling
         tFoot.setHorizontalScrollPosition(scrollLeft);
 
         firstRowInViewPort = calcFirstRowInViewPort();
         if (firstRowInViewPort > totalRows - pageLength) {
             firstRowInViewPort = totalRows - pageLength;
         }
 
         int postLimit = (int) (firstRowInViewPort + (pageLength - 1) + pageLength
                 * cache_react_rate);
         if (postLimit > totalRows - 1) {
             postLimit = totalRows - 1;
         }
         int preLimit = (int) (firstRowInViewPort - pageLength
                 * cache_react_rate);
         if (preLimit < 0) {
             preLimit = 0;
         }
         final int lastRendered = scrollBody.getLastRendered();
         final int firstRendered = scrollBody.getFirstRendered();
 
         if (postLimit <= lastRendered && preLimit >= firstRendered) {
             // we're within no-react area, no need to request more rows
             // remember which firstvisible we requested, in case the server has
             // a differing opinion
             lastRequestedFirstvisible = firstRowInViewPort;
             client.updateVariable(paintableId, "firstvisible",
                     firstRowInViewPort, false);
             return;
         }
 
         if (firstRowInViewPort - pageLength * cache_rate > lastRendered
                 || firstRowInViewPort + pageLength + pageLength * cache_rate < firstRendered) {
             // need a totally new set of rows
             rowRequestHandler
                     .setReqFirstRow((firstRowInViewPort - (int) (pageLength * cache_rate)));
             int last = firstRowInViewPort + (int) (cache_rate * pageLength)
                     + pageLength - 1;
             if (last >= totalRows) {
                 last = totalRows - 1;
             }
             rowRequestHandler.setReqRows(last
                     - rowRequestHandler.getReqFirstRow() + 1);
             rowRequestHandler.deferRowFetch();
             return;
         }
         if (preLimit < firstRendered) {
             // need some rows to the beginning of the rendered area
             rowRequestHandler
                     .setReqFirstRow((int) (firstRowInViewPort - pageLength
                             * cache_rate));
             rowRequestHandler.setReqRows(firstRendered
                     - rowRequestHandler.getReqFirstRow());
             rowRequestHandler.deferRowFetch();
 
             return;
         }
         if (postLimit > lastRendered) {
             // need some rows to the end of the rendered area
             int reqRows = (int) ((firstRowInViewPort + pageLength + pageLength
                     * cache_rate) - lastRendered);
             rowRequestHandler.triggerRowFetch(lastRendered + 1, reqRows);
         }
     }
 
     protected int calcFirstRowInViewPort() {
         return (int) Math.ceil(scrollTop / scrollBody.getRowHeight());
     }
 
     @Override
     public VScrollTableDropHandler getDropHandler() {
         return dropHandler;
     }
 
     private static class TableDDDetails {
         int overkey = -1;
         VerticalDropLocation dropLocation;
         String colkey;
 
         @Override
         public boolean equals(Object obj) {
             if (obj instanceof TableDDDetails) {
                 TableDDDetails other = (TableDDDetails) obj;
                 return dropLocation == other.dropLocation
                         && overkey == other.overkey
                         && ((colkey != null && colkey.equals(other.colkey)) || (colkey == null && other.colkey == null));
             }
             return false;
         }
 
         //
         // public int hashCode() {
         // return overkey;
         // }
     }
 
     public class VScrollTableDropHandler extends VAbstractDropHandler {
 
         private static final String ROWSTYLEBASE = "v-table-row-drag-";
         private TableDDDetails dropDetails;
         private TableDDDetails lastEmphasized;
 
         @Override
         public void dragEnter(VDragEvent drag) {
             updateDropDetails(drag);
             super.dragEnter(drag);
         }
 
         private void updateDropDetails(VDragEvent drag) {
             dropDetails = new TableDDDetails();
             Element elementOver = drag.getElementOver();
 
             VScrollTableRow row = Util.findWidget(elementOver, getRowClass());
             if (row != null) {
                 dropDetails.overkey = row.rowKey;
                 Element tr = row.getElement();
                 Element element = elementOver;
                 while (element != null && element.getParentElement() != tr) {
                     element = (Element) element.getParentElement();
                 }
                 int childIndex = DOM.getChildIndex(tr, element);
                 dropDetails.colkey = tHead.getHeaderCell(childIndex)
                         .getColKey();
                 dropDetails.dropLocation = DDUtil.getVerticalDropLocation(
                         row.getElement(), drag.getCurrentGwtEvent(), 0.2);
             }
 
             drag.getDropDetails().put("itemIdOver", dropDetails.overkey + "");
             drag.getDropDetails().put(
                     "detail",
                     dropDetails.dropLocation != null ? dropDetails.dropLocation
                             .toString() : null);
 
         }
 
         private Class<? extends Widget> getRowClass() {
             // get the row type this way to make dd work in derived
             // implementations
             return scrollBody.iterator().next().getClass();
         }
 
         @Override
         public void dragOver(VDragEvent drag) {
             TableDDDetails oldDetails = dropDetails;
             updateDropDetails(drag);
             if (!oldDetails.equals(dropDetails)) {
                 deEmphasis();
                 final TableDDDetails newDetails = dropDetails;
                 VAcceptCallback cb = new VAcceptCallback() {
 
                     @Override
                     public void accepted(VDragEvent event) {
                         if (newDetails.equals(dropDetails)) {
                             dragAccepted(event);
                         }
                         /*
                          * Else new target slot already defined, ignore
                          */
                     }
                 };
                 validate(cb, drag);
             }
         }
 
         @Override
         public void dragLeave(VDragEvent drag) {
             deEmphasis();
             super.dragLeave(drag);
         }
 
         @Override
         public boolean drop(VDragEvent drag) {
             deEmphasis();
             return super.drop(drag);
         }
 
         private void deEmphasis() {
             UIObject.setStyleName(getElement(),
                     VScrollTablePatched.this.getStylePrimaryName() + "-drag", false);
             if (lastEmphasized == null) {
                 return;
             }
             for (Widget w : scrollBody.renderedRows) {
                 VScrollTableRow row = (VScrollTableRow) w;
                 if (lastEmphasized != null
                         && row.rowKey == lastEmphasized.overkey) {
                     String stylename = ROWSTYLEBASE
                             + lastEmphasized.dropLocation.toString()
                                     .toLowerCase();
                     VScrollTableRow.setStyleName(row.getElement(), stylename,
                             false);
                     lastEmphasized = null;
                     return;
                 }
             }
         }
 
         /**
          * TODO needs different drop modes ?? (on cells, on rows), now only
          * supports rows
          */
         private void emphasis(TableDDDetails details) {
             deEmphasis();
             UIObject.setStyleName(getElement(),
                     VScrollTablePatched.this.getStylePrimaryName() + "-drag", true);
             // iterate old and new emphasized row
             for (Widget w : scrollBody.renderedRows) {
                 VScrollTableRow row = (VScrollTableRow) w;
                 if (details != null && details.overkey == row.rowKey) {
                     String stylename = ROWSTYLEBASE
                             + details.dropLocation.toString().toLowerCase();
                     VScrollTableRow.setStyleName(row.getElement(), stylename,
                             true);
                     lastEmphasized = details;
                     return;
                 }
             }
         }
 
         @Override
         protected void dragAccepted(VDragEvent drag) {
             emphasis(dropDetails);
         }
 
         @Override
         public ComponentConnector getConnector() {
             return ConnectorMap.get(client).getConnector(VScrollTablePatched.this);
         }
 
         @Override
         public ApplicationConnection getApplicationConnection() {
             return client;
         }
 
     }
 
     protected VScrollTableRow getFocusedRow() {
         return focusedRow;
     }
 
     /**
      * Moves the selection head to a specific row
      * 
      * @param row
      *            The row to where the selection head should move
      * @return Returns true if focus was moved successfully, else false
      */
     public boolean setRowFocus(VScrollTableRow row) {
 
         if (!isSelectable()) {
             return false;
         }
 
         // Remove previous selection
         if (focusedRow != null && focusedRow != row) {
             focusedRow.removeStyleName(getStylePrimaryName() + "-focus");
         }
 
         if (row != null) {
 
             // Apply focus style to new selection
             row.addStyleName(getStylePrimaryName() + "-focus");
 
             /*
              * Trying to set focus on already focused row
              */
             if (row == focusedRow) {
                 return false;
             }
 
             // Set new focused row
             focusedRow = row;
 
             ensureRowIsVisible(row);
 
             return true;
         }
 
         return false;
     }
 
     /**
      * Ensures that the row is visible
      * 
      * @param row
      *            The row to ensure is visible
      */
     private void ensureRowIsVisible(VScrollTableRow row) {
         if (BrowserInfo.get().isTouchDevice()) {
             // Skip due to android devices that have broken scrolltop will may
             // get odd scrolling here.
             return;
         }
         Util.scrollIntoViewVertically(row.getElement());
     }
 
     /**
      * Handles the keyboard events handled by the table
      * 
      * @param event
      *            The keyboard event received
      * @return true iff the navigation event was handled
      */
     protected boolean handleNavigation(int keycode, boolean ctrl, boolean shift) {
         if (keycode == KeyCodes.KEY_TAB || keycode == KeyCodes.KEY_SHIFT) {
             // Do not handle tab key
             return false;
         }
 
         // Down navigation
         if (!isSelectable() && keycode == getNavigationDownKey()) {
             scrollBodyPanel.setScrollPosition(scrollBodyPanel
                     .getScrollPosition() + scrollingVelocity);
             return true;
         } else if (keycode == getNavigationDownKey()) {
             if (isMultiSelectModeAny() && moveFocusDown()) {
                 selectFocusedRow(ctrl, shift);
 
             } else if (isSingleSelectMode() && !shift && moveFocusDown()) {
                 selectFocusedRow(ctrl, shift);
             }
             return true;
         }
 
         // Up navigation
         if (!isSelectable() && keycode == getNavigationUpKey()) {
             scrollBodyPanel.setScrollPosition(scrollBodyPanel
                     .getScrollPosition() - scrollingVelocity);
             return true;
         } else if (keycode == getNavigationUpKey()) {
             if (isMultiSelectModeAny() && moveFocusUp()) {
                 selectFocusedRow(ctrl, shift);
             } else if (isSingleSelectMode() && !shift && moveFocusUp()) {
                 selectFocusedRow(ctrl, shift);
             }
             return true;
         }
 
         if (keycode == getNavigationLeftKey()) {
             // Left navigation
             scrollBodyPanel.setHorizontalScrollPosition(scrollBodyPanel
                     .getHorizontalScrollPosition() - scrollingVelocity);
             return true;
 
         } else if (keycode == getNavigationRightKey()) {
             // Right navigation
             scrollBodyPanel.setHorizontalScrollPosition(scrollBodyPanel
                     .getHorizontalScrollPosition() + scrollingVelocity);
             return true;
         }
 
         // Select navigation
         if (isSelectable() && keycode == getNavigationSelectKey()) {
             if (isSingleSelectMode()) {
                 boolean wasSelected = focusedRow.isSelected();
                 deselectAll();
                 if (!wasSelected || !nullSelectionAllowed) {
                     focusedRow.toggleSelection();
                 }
             } else {
                 focusedRow.toggleSelection();
                 removeRowFromUnsentSelectionRanges(focusedRow);
             }
 
             sendSelectedRows();
             return true;
         }
 
         // Page Down navigation
         if (keycode == getNavigationPageDownKey()) {
             if (isSelectable()) {
                 /*
                  * If selectable we plagiate MSW behaviour: first scroll to the
                  * end of current view. If at the end, scroll down one page
                  * length and keep the selected row in the bottom part of
                  * visible area.
                  */
                 if (!isFocusAtTheEndOfTable()) {
                     VScrollTableRow lastVisibleRowInViewPort = scrollBody
                             .getRowByRowIndex(firstRowInViewPort
                                     + getFullyVisibleRowCount() - 1);
                     if (lastVisibleRowInViewPort != null
                             && lastVisibleRowInViewPort != focusedRow) {
                         // focused row is not at the end of the table, move
                         // focus and select the last visible row
                         setRowFocus(lastVisibleRowInViewPort);
                         selectFocusedRow(ctrl, shift);
                         sendSelectedRows();
                     } else {
                         int indexOfToBeFocused = focusedRow.getIndex()
                                 + getFullyVisibleRowCount();
                         if (indexOfToBeFocused >= totalRows) {
                             indexOfToBeFocused = totalRows - 1;
                         }
                         VScrollTableRow toBeFocusedRow = scrollBody
                                 .getRowByRowIndex(indexOfToBeFocused);
 
                         if (toBeFocusedRow != null) {
                             /*
                              * if the next focused row is rendered
                              */
                             setRowFocus(toBeFocusedRow);
                             selectFocusedRow(ctrl, shift);
                             // TODO needs scrollintoview ?
                             sendSelectedRows();
                         } else {
                             // scroll down by pixels and return, to wait for
                             // new rows, then select the last item in the
                             // viewport
                             selectLastItemInNextRender = true;
                             multiselectPending = shift;
                             scrollByPagelenght(1);
                         }
                     }
                 }
             } else {
                 /* No selections, go page down by scrolling */
                 scrollByPagelenght(1);
             }
             return true;
         }
 
         // Page Up navigation
         if (keycode == getNavigationPageUpKey()) {
             if (isSelectable()) {
                 /*
                  * If selectable we plagiate MSW behaviour: first scroll to the
                  * end of current view. If at the end, scroll down one page
                  * length and keep the selected row in the bottom part of
                  * visible area.
                  */
                 if (!isFocusAtTheBeginningOfTable()) {
                     VScrollTableRow firstVisibleRowInViewPort = scrollBody
                             .getRowByRowIndex(firstRowInViewPort);
                     if (firstVisibleRowInViewPort != null
                             && firstVisibleRowInViewPort != focusedRow) {
                         // focus is not at the beginning of the table, move
                         // focus and select the first visible row
                         setRowFocus(firstVisibleRowInViewPort);
                         selectFocusedRow(ctrl, shift);
                         sendSelectedRows();
                     } else {
                         int indexOfToBeFocused = focusedRow.getIndex()
                                 - getFullyVisibleRowCount();
                         if (indexOfToBeFocused < 0) {
                             indexOfToBeFocused = 0;
                         }
                         VScrollTableRow toBeFocusedRow = scrollBody
                                 .getRowByRowIndex(indexOfToBeFocused);
 
                         if (toBeFocusedRow != null) { // if the next focused row
                                                       // is rendered
                             setRowFocus(toBeFocusedRow);
                             selectFocusedRow(ctrl, shift);
                             // TODO needs scrollintoview ?
                             sendSelectedRows();
                         } else {
                             // unless waiting for the next rowset already
                             // scroll down by pixels and return, to wait for
                             // new rows, then select the last item in the
                             // viewport
                             selectFirstItemInNextRender = true;
                             multiselectPending = shift;
                             scrollByPagelenght(-1);
                         }
                     }
                 }
             } else {
                 /* No selections, go page up by scrolling */
                 scrollByPagelenght(-1);
             }
 
             return true;
         }
 
         // Goto start navigation
         if (keycode == getNavigationStartKey()) {
             scrollBodyPanel.setScrollPosition(0);
             if (isSelectable()) {
                 if (focusedRow != null && focusedRow.getIndex() == 0) {
                     return false;
                 } else {
                     VScrollTableRow rowByRowIndex = (VScrollTableRow) scrollBody
                             .iterator().next();
                     if (rowByRowIndex.getIndex() == 0) {
                         setRowFocus(rowByRowIndex);
                         selectFocusedRow(ctrl, shift);
                         sendSelectedRows();
                     } else {
                         // first row of table will come in next row fetch
                         if (ctrl) {
                             focusFirstItemInNextRender = true;
                         } else {
                             selectFirstItemInNextRender = true;
                             multiselectPending = shift;
                         }
                     }
                 }
             }
             return true;
         }
 
         // Goto end navigation
         if (keycode == getNavigationEndKey()) {
             scrollBodyPanel.setScrollPosition(scrollBody.getOffsetHeight());
             if (isSelectable()) {
                 final int lastRendered = scrollBody.getLastRendered();
                 if (lastRendered + 1 == totalRows) {
                     VScrollTableRow rowByRowIndex = scrollBody
                             .getRowByRowIndex(lastRendered);
                     if (focusedRow != rowByRowIndex) {
                         setRowFocus(rowByRowIndex);
                         selectFocusedRow(ctrl, shift);
                         sendSelectedRows();
                     }
                 } else {
                     if (ctrl) {
                         focusLastItemInNextRender = true;
                     } else {
                         selectLastItemInNextRender = true;
                         multiselectPending = shift;
                     }
                 }
             }
             return true;
         }
 
         return false;
     }
 
     private boolean isFocusAtTheBeginningOfTable() {
         return focusedRow.getIndex() == 0;
     }
 
     private boolean isFocusAtTheEndOfTable() {
         return focusedRow.getIndex() + 1 >= totalRows;
     }
 
     private int getFullyVisibleRowCount() {
         return (int) (scrollBodyPanel.getOffsetHeight() / scrollBody
                 .getRowHeight());
     }
 
     private void scrollByPagelenght(int i) {
         int pixels = i * scrollBodyPanel.getOffsetHeight();
         int newPixels = scrollBodyPanel.getScrollPosition() + pixels;
         if (newPixels < 0) {
             newPixels = 0;
         } // else if too high, NOP (all know browsers accept illegally big
           // values here)
         scrollBodyPanel.setScrollPosition(newPixels);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see
      * com.google.gwt.event.dom.client.FocusHandler#onFocus(com.google.gwt.event
      * .dom.client.FocusEvent)
      */
 
     @Override
     public void onFocus(FocusEvent event) {
         if (isFocusable()) {
             hasFocus = true;
 
             // Focus a row if no row is in focus
             if (focusedRow == null) {
                 focusRowFromBody();
             } else {
                 setRowFocus(focusedRow);
             }
         }
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see
      * com.google.gwt.event.dom.client.BlurHandler#onBlur(com.google.gwt.event
      * .dom.client.BlurEvent)
      */
 
     @Override
     public void onBlur(BlurEvent event) {
         hasFocus = false;
         navKeyDown = false;
 
         if (BrowserInfo.get().isIE()) {
             /*
              * IE sometimes moves focus to a clicked table cell... (#7965)
              * ...and sometimes it sends blur events even though the focus
              * handler is still active. (#10464)
              */
             Element focusedElement = Util.getIEFocusedElement();
             if (Util.getConnectorForElement(client, getParent(), focusedElement) == this
                     && focusedElement != null
                     && focusedElement != scrollBodyPanel.getFocusElement()) {
                 /*
                  * Steal focus back to the focus handler if it was moved to some
                  * other part of the table. Avoid stealing focus in other cases.
                  */
                 focus();
                 return;
             }
         }
 
         if (isFocusable()) {
             // Unfocus any row
             setRowFocus(null);
         }
     }
 
     /**
      * Removes a key from a range if the key is found in a selected range
      * 
      * @param key
      *            The key to remove
      */
     public void removeRowFromUnsentSelectionRanges(VScrollTableRow row) {
         Collection<SelectionRange> newRanges = null;
         for (Iterator<SelectionRange> iterator = selectedRowRanges.iterator(); iterator
                 .hasNext();) {
             SelectionRange range = iterator.next();
             if (range.inRange(row)) {
                 // Split the range if given row is in range
                 Collection<SelectionRange> splitranges = range.split(row);
                 if (newRanges == null) {
                     newRanges = new ArrayList<SelectionRange>();
                 }
                 newRanges.addAll(splitranges);
                 iterator.remove();
             }
         }
         if (newRanges != null) {
             selectedRowRanges.addAll(newRanges);
         }
     }
 
     /**
      * Can the Table be focused?
      * 
      * @return True if the table can be focused, else false
      */
     public boolean isFocusable() {
         if (scrollBody != null && enabled) {
             return !(!hasHorizontalScrollbar() && !hasVerticalScrollbar() && !isSelectable());
         }
         return false;
     }
 
     private boolean hasHorizontalScrollbar() {
         return scrollBody.getOffsetWidth() > scrollBodyPanel.getOffsetWidth();
     }
 
     private boolean hasVerticalScrollbar() {
         return scrollBody.getOffsetHeight() > scrollBodyPanel.getOffsetHeight();
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see com.vaadin.client.Focusable#focus()
      */
 
     @Override
     public void focus() {
         if (isFocusable()) {
             scrollBodyPanel.focus();
         }
     }
 
     /**
      * Sets the proper tabIndex for scrollBodyPanel (the focusable elemen in the
      * component).
      * <p>
      * If the component has no explicit tabIndex a zero is given (default
      * tabbing order based on dom hierarchy) or -1 if the component does not
      * need to gain focus. The component needs no focus if it has no scrollabars
      * (not scrollable) and not selectable. Note that in the future shortcut
      * actions may need focus.
      * <p>
      * For internal use only. May be removed or replaced in the future.
      */
     public void setProperTabIndex() {
         int storedScrollTop = 0;
         int storedScrollLeft = 0;
 
         if (BrowserInfo.get().getOperaVersion() >= 11) {
             // Workaround for Opera scroll bug when changing tabIndex (#6222)
             storedScrollTop = scrollBodyPanel.getScrollPosition();
             storedScrollLeft = scrollBodyPanel.getHorizontalScrollPosition();
         }
 
         if (tabIndex == 0 && !isFocusable()) {
             scrollBodyPanel.setTabIndex(-1);
         } else {
             scrollBodyPanel.setTabIndex(tabIndex);
         }
 
         if (BrowserInfo.get().getOperaVersion() >= 11) {
             // Workaround for Opera scroll bug when changing tabIndex (#6222)
             scrollBodyPanel.setScrollPosition(storedScrollTop);
             scrollBodyPanel.setHorizontalScrollPosition(storedScrollLeft);
         }
     }
 
     public void startScrollingVelocityTimer() {
         if (scrollingVelocityTimer == null) {
             scrollingVelocityTimer = new Timer() {
 
                 @Override
                 public void run() {
                     scrollingVelocity++;
                 }
             };
             scrollingVelocityTimer.scheduleRepeating(100);
         }
     }
 
     public void cancelScrollingVelocityTimer() {
         if (scrollingVelocityTimer != null) {
             // Remove velocityTimer if it exists and the Table is disabled
             scrollingVelocityTimer.cancel();
             scrollingVelocityTimer = null;
             scrollingVelocity = 10;
         }
     }
 
     /**
      * 
      * @param keyCode
      * @return true if the given keyCode is used by the table for navigation
      */
     private boolean isNavigationKey(int keyCode) {
         return keyCode == getNavigationUpKey()
                 || keyCode == getNavigationLeftKey()
                 || keyCode == getNavigationRightKey()
                 || keyCode == getNavigationDownKey()
                 || keyCode == getNavigationPageUpKey()
                 || keyCode == getNavigationPageDownKey()
                 || keyCode == getNavigationEndKey()
                 || keyCode == getNavigationStartKey();
     }
 
     public void lazyRevertFocusToRow(final VScrollTableRow currentlyFocusedRow) {
         Scheduler.get().scheduleFinally(new ScheduledCommand() {
 
             @Override
             public void execute() {
                 if (currentlyFocusedRow != null) {
                     setRowFocus(currentlyFocusedRow);
                 } else {
                     VConsole.log("no row?");
                     focusRowFromBody();
                 }
                 scrollBody.ensureFocus();
             }
         });
     }
 
     @Override
     public Action[] getActions() {
         if (bodyActionKeys == null) {
             return new Action[] {};
         }
         final Action[] actions = new Action[bodyActionKeys.length];
         for (int i = 0; i < actions.length; i++) {
             final String actionKey = bodyActionKeys[i];
             Action bodyAction = new TreeAction(this, null, actionKey);
             bodyAction.setCaption(getActionCaption(actionKey));
             bodyAction.setIconUrl(getActionIcon(actionKey));
             actions[i] = bodyAction;
         }
         return actions;
     }
 
     @Override
     public ApplicationConnection getClient() {
         return client;
     }
 
     @Override
     public String getPaintableId() {
         return paintableId;
     }
 
     /**
      * Add this to the element mouse down event by using element.setPropertyJSO
      * ("onselectstart",applyDisableTextSelectionIEHack()); Remove it then again
      * when the mouse is depressed in the mouse up event.
      * 
      * @return Returns the JSO preventing text selection
      */
     private static native JavaScriptObject getPreventTextSelectionIEHack()
     /*-{
             return function(){ return false; };
     }-*/;
 
     public void triggerLazyColumnAdjustment(boolean now) {
         lazyAdjustColumnWidths.cancel();
         if (now) {
             lazyAdjustColumnWidths.run();
         } else {
             lazyAdjustColumnWidths.schedule(LAZY_COLUMN_ADJUST_TIMEOUT);
         }
     }
 
     private boolean isDynamicWidth() {
         ComponentConnector paintable = ConnectorMap.get(client).getConnector(
                 this);
         return paintable.isUndefinedWidth();
     }
 
     private boolean isDynamicHeight() {
         ComponentConnector paintable = ConnectorMap.get(client).getConnector(
                 this);
         if (paintable == null) {
             // This should be refactored. As isDynamicHeight can be called from
             // a timer it is possible that the connector has been unregistered
             // when this method is called, causing getConnector to return null.
             return false;
         }
         return paintable.isUndefinedHeight();
     }
 
     private void debug(String msg) {
         if (enableDebug) {
             VConsole.error(msg);
         }
     }
 
     public Widget getWidgetForPaintable() {
         return this;
     }
 
 }