1 /**
2 * This file Copyright (c) 2010-2018 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.vaadin.gwt.client.magnoliashell.viewport.widget;
35
36 import info.magnolia.ui.vaadin.gwt.client.magnoliashell.viewport.TransitionDelegate;
37
38 import com.google.gwt.user.client.ui.FlowPanel;
39 import com.google.gwt.user.client.ui.Widget;
40
41 /**
42 * An overlay that displays the open app in the shell on top of each other.
43 *
44 * @param <T> type of {@link TransitionDelegate} which backs up a concrete viewport widget
45 */
46 public class ViewportWidget<T extends TransitionDelegate> extends FlowPanel {
47
48 private Widget visibleChild;
49
50 private T transitionDelegate;
51
52 public ViewportWidget() {
53 super();
54 addStyleName("v-viewport");
55 }
56
57 public T getTransitionDelegate() {
58 return transitionDelegate;
59 }
60
61 public void setTransitionDelegate(T transitionDelegate) {
62 this.transitionDelegate = transitionDelegate;
63 }
64
65 public Widget getVisibleChild() {
66 return visibleChild;
67 }
68
69 public void showChild(Widget w) {
70 if (w != visibleChild) {
71 transitionDelegate.setVisibleChild(w);
72 visibleChild = w;
73 }
74 }
75
76 public void removeChild(Widget w) {
77 removeChildNoTransition(w);
78 }
79
80 /**
81 * Default non-transitioning behavior, accessible to transition delegates as a fall back.
82 */
83 public void showChildNoTransition(Widget w) {
84 if (visibleChild != null) {
85 visibleChild.setVisible(false);
86 }
87 w.setVisible(true);
88 }
89
90 public void removeChildNoTransition(Widget w) {
91 super.remove(w);
92 }
93
94
95 }