1 /**
2 * This file Copyright (c) 2018 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.ui.contentapp.browser.drop;
35
36 import info.magnolia.ui.contentapp.DataModifier;
37 import info.magnolia.ui.framework.datasource.DatasourceComponent;
38
39 import com.vaadin.shared.ui.dnd.DropEffect;
40 import com.vaadin.shared.ui.grid.DropLocation;
41 import com.vaadin.shared.ui.grid.DropMode;
42 import com.vaadin.ui.Grid;
43 import com.vaadin.ui.components.grid.GridRowDragger;
44 import com.vaadin.ui.components.grid.TargetDataProviderUpdater;
45
46 /**
47 * {@link com.vaadin.ui.components.grid.GridRowDragger} delegating drag&drop event to {@link info.magnolia.ui.contentapp.DataModifier#moveItems(java.util.Collection, Object, com.vaadin.shared.ui.grid.DropLocation)}.
48 *
49 * @param <T> item type.
50 */
51 public class RowDragger<T> extends GridRowDragger<T> {
52
53 private T target;
54 private DropLocation dropLocation;
55
56 public RowDragger(@DatasourceComponent DataModifier<T> dataModifier, Grid<T> grid, DropMode dropMode, DropConstraint<T> dropConstraint) {
57 super(grid, dropMode);
58
59 getGridDropTarget().setDropEffect(DropEffect.MOVE);
60 setSourceDataProviderUpdater((dropEffect, dataProvider, items) -> {
61 });
62 setDropIndexCalculator(event -> {
63 dropLocation = event.getDropLocation();
64 event.getDropTargetRow().ifPresent(row -> target = row);
65 return 0;
66 });
67 setTargetDataProviderUpdater((TargetDataProviderUpdater<T>) (dropEffect, dataProvider, index, items) -> {
68 if (dropConstraint.isAllowedAt(items, target, dropLocation)) {
69 dataModifier.moveItems(items, target, dropLocation);
70 }
71 });
72 }
73 }