Mercurial > projects > dwt2

comparison org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/dnd/DropTargetEffect.d @ 0:6dd524f61e62

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:6dd524f61e62
1 /*******************************************************************************
2 * Copyright (c) 2007, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module org.eclipse.swt.dnd.DropTargetEffect;
14
15
16 import org.eclipse.swt.SWT;
17 import org.eclipse.swt.graphics.Point;
18 import org.eclipse.swt.graphics.Rectangle;
19 import org.eclipse.swt.widgets.Control;
20 import org.eclipse.swt.widgets.Table;
21 import org.eclipse.swt.widgets.TableItem;
22 import org.eclipse.swt.widgets.Tree;
23 import org.eclipse.swt.widgets.TreeItem;
24 import org.eclipse.swt.widgets.Widget;
25 import org.eclipse.swt.dnd.DropTargetAdapter;
26
27
28 /**
29 * This class provides a default drag under effect during a drag and drop.
30 * The current implementation does not provide any visual feedback.
31 *
32 * <p>The drop target effect has the same API as the
33 * <code>DropTargetAdapter</code> so that it can provide custom visual
34 * feedback when a <code>DropTargetEvent</code> occurs.
35 * </p>
36 *
37 * <p>Classes that wish to provide their own drag under effect
38 * can extend the <code>DropTargetEffect</code> and override any applicable methods
39 * in <code>DropTargetAdapter</code> to display their own drag under effect.</p>
40 *
41 * <p>The feedback value is either one of the FEEDBACK constants defined in
42 * class <code>DND</code> which is applicable to instances of this class,
43 * or it must be built by <em>bitwise OR</em>'ing together
44 * (that is, using the <code>int</code> "|" operator) two or more
45 * of those <code>DND</code> effect constants.
46 * </p>
47 * <p>
48 * <dl>
49 * <dt><b>Feedback:</b></dt>
50 * <dd>FEEDBACK_EXPAND, FEEDBACK_INSERT_AFTER, FEEDBACK_INSERT_BEFORE,
51 * FEEDBACK_NONE, FEEDBACK_SELECT, FEEDBACK_SCROLL</dd>
52 * </dl>
53 * </p>
54 *
55 * @see DropTargetAdapter
56 * @see DropTargetEvent
57 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
58 *
59 * @since 3.3
60 */
61 public class DropTargetEffect : DropTargetAdapter {
62 Control control;
63
64 /**
65 * Creates a new <code>DropTargetEffect</code> to handle the drag under effect on the specified
66 * <code>Control</code>.
67 *
68 * @param control the <code>Control</code> over which the user positions the cursor to drop the data
69 *
70 * @exception IllegalArgumentException <ul>
71 * <li>ERROR_NULL_ARGUMENT - if the control is null</li>
72 * </ul>
73 */
74 public this(Control control) {
75 if (control is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
76 this.control = control;
77 }
78
79 /**
80 * Returns the Control which is registered for this DropTargetEffect. This is the control over which the
81 * user positions the cursor to drop the data.
82 *
83 * @return the Control which is registered for this DropTargetEffect
84 */
85 public Control getControl() {
86 return control;
87 }
88
89 /**
90 * Returns the item at the given x-y coordinate in the receiver
91 * or null if no such item exists. The x-y coordinate is in the
92 * display relative coordinates.
93 *
94 * @param x the x coordinate used to locate the item
95 * @param y the y coordinate used to locate the item
96 * @return the item at the given x-y coordinate, or null if the coordinate is not in a selectable item
97 */
98 public Widget getItem(int x, int y) {
99 if ( auto table = cast(Table)control ) {
100 return getItem(table, x, y);
101 }
102 if ( auto tree = cast(Tree)control ) {
103 return getItem(tree, x, y);
104 }
105 return null;
106 }
107
108 Widget getItem(Table table, int x, int y) {
109 Point coordinates = new Point(x, y);
110 coordinates = table.toControl(coordinates);
111 TableItem item = table.getItem(coordinates);
112 if (item !is null) return item;
113 Rectangle area = table.getClientArea();
114 int tableBottom = area.y + area.height;
115 int itemCount = table.getItemCount();
116 for (int i=table.getTopIndex(); i<itemCount; i++) {
117 item = table.getItem(i);
118 Rectangle rect = item.getBounds();
119 rect.x = area.x;
120 rect.width = area.width;
121 if (rect.contains(coordinates)) return item;
122 if (rect.y > tableBottom) break;
123 }
124 return null;
125 }
126
127 Widget getItem(Tree tree, int x, int y) {
128 Point point = new Point(x, y);
129 point = tree.toControl(point);
130 TreeItem item = tree.getItem(point);
131 if (item is null) {
132 Rectangle area = tree.getClientArea();
133 if (area.contains(point)) {
134 int treeBottom = area.y + area.height;
135 item = tree.getTopItem();
136 while (item !is null) {
137 Rectangle rect = item.getBounds();
138 int itemBottom = rect.y + rect.height;
139 if (rect.y <= point.y && point.y < itemBottom) return item;
140 if (itemBottom > treeBottom) break;
141 item = nextItem(tree, item);
142 }
143 return null;
144 }
145 }
146 return item;
147 }
148
149 TreeItem nextItem(Tree tree, TreeItem item) {
150 if (item is null) return null;
151 if (item.getExpanded() && item.getItemCount() > 0) return item.getItem(0);
152 TreeItem childItem = item;
153 TreeItem parentItem = childItem.getParentItem();
154 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
155 int count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount();
156 while (true) {
157 if (index + 1 < count) return parentItem is null ? tree.getItem(index + 1) : parentItem.getItem(index + 1);
158 if (parentItem is null) return null;
159 childItem = parentItem;
160 parentItem = childItem.getParentItem();
161 index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
162 count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount();
163 }
164 }
165
166 TreeItem previousItem(Tree tree, TreeItem item) {
167 if (item is null) return null;
168 TreeItem childItem = item;
169 TreeItem parentItem = childItem.getParentItem();
170 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
171 if (index is 0) return parentItem;
172 TreeItem nextItem = parentItem is null ? tree.getItem(index-1) : parentItem.getItem(index-1);
173 int count = nextItem.getItemCount();
174 while (count > 0 && nextItem.getExpanded()) {
175 nextItem = nextItem.getItem(count - 1);
176 count = nextItem.getItemCount();
177 }
178 return nextItem;
179 }
180 }