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comparison dwt/dnd/TableDropTargetEffect.d @ 135:242e33c0e383

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Added dnd source, ByteArrayTransfer,Clipboard completed
author Frank Benoit <benoit@tionex.de>
date Wed, 13 Feb 2008 04:51:22 +0100
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children 3665cb9211b2
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134:fa7d7d66b9ed 135:242e33c0e383
1 /*******************************************************************************
2 * Copyright (c) 2007 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 dwt.dnd.TableDropTargetEffect;
14
15 import dwt.graphics.Point;
16 import dwt.internal.win32.OS;
17 import dwt.widgets.Table;
18 import dwt.widgets.TableItem;
19
20 /**
21 * This class provides a default drag under effect (eg. select, insert and scroll)
22 * when a drag occurs over a <code>Table</code>.
23 *
24 * <p>Classes that wish to provide their own drag under effect for a <code>Table</code>
25 * can extend the <code>TableDropTargetEffect</code> and override any applicable methods
26 * in <code>TableDropTargetEffect</code> to display their own drag under effect.</p>
27 *
28 * Subclasses that override any methods of this class must call the corresponding
29 * <code>super</code> method to get the default drag under effect implementation.
30 *
31 * <p>The feedback value is either one of the FEEDBACK constants defined in
32 * class <code>DND</code> which is applicable to instances of this class,
33 * or it must be built by <em>bitwise OR</em>'ing together
34 * (that is, using the <code>int</code> "|" operator) two or more
35 * of those <code>DND</code> effect constants.
36 * </p>
37 * <p>
38 * <dl>
39 * <dt><b>Feedback:</b></dt>
40 * <dd>FEEDBACK_SELECT, FEEDBACK_SCROLL</dd>
41 * </dl>
42 * </p>
43 *
44 * @see DropTargetAdapter
45 * @see DropTargetEvent
46 *
47 * @since 3.3
48 */
49 public class TableDropTargetEffect : DropTargetEffect {
50 static final int SCROLL_HYSTERESIS = 200; // milli seconds
51
52 int scrollIndex = -1;
53 long scrollBeginTime;
54 TableItem dropHighlight;
55
56 /**
57 * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified
58 * <code>Table</code>.
59 *
60 * @param table the <code>Table</code> over which the user positions the cursor to drop the data
61 */
62 public this(Table table) {
63 super(table);
64 }
65
66 int checkEffect(int effect) {
67 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
68 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
69 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
70 return effect;
71 }
72
73 /**
74 * This implementation of <code>dragEnter</code> provides a default drag under effect
75 * for the feedback specified in <code>event.feedback</code>.
76 *
77 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
78 *
79 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
80 * to get the default drag under effect implementation.
81 *
82 * @param event the information associated with the drag enter event
83 *
84 * @see DropTargetAdapter
85 * @see DropTargetEvent
86 */
87 public void dragEnter(DropTargetEvent event) {
88 scrollBeginTime = 0;
89 scrollIndex = -1;
90 dropHighlight = null;
91 }
92
93 /**
94 * This implementation of <code>dragLeave</code> provides a default drag under effect
95 * for the feedback specified in <code>event.feedback</code>.
96 *
97 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
98 *
99 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
100 * to get the default drag under effect implementation.
101 *
102 * @param event the information associated with the drag leave event
103 *
104 * @see DropTargetAdapter
105 * @see DropTargetEvent
106 */
107 public void dragLeave(DropTargetEvent event) {
108 Table table = (Table) control;
109 int handle = table.handle;
110 if (dropHighlight !is null) {
111 LVITEM lvItem = new LVITEM ();
112 lvItem.stateMask = OS.LVIS_DROPHILITED;
113 OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);
114 dropHighlight = null;
115 }
116 scrollBeginTime = 0;
117 scrollIndex = -1;
118 }
119
120 /**
121 * This implementation of <code>dragOver</code> provides a default drag under effect
122 * for the feedback specified in <code>event.feedback</code>. The class description
123 * lists the FEEDBACK constants that are applicable to the class.
124 *
125 * For additional information see <code>DropTargetAdapter.dragOver</code>.
126 *
127 * Subclasses that override this method should call <code>super.dragOver(event)</code>
128 * to get the default drag under effect implementation.
129 *
130 * @param event the information associated with the drag over event
131 *
132 * @see DropTargetAdapter
133 * @see DropTargetEvent
134 * @see DND#FEEDBACK_SELECT
135 * @see DND#FEEDBACK_SCROLL
136 */
137 public void dragOver(DropTargetEvent event) {
138 Table table = (Table) getControl();
139 int effect = checkEffect(event.feedback);
140 int handle = table.handle;
141 Point coordinates = new Point(event.x, event.y);
142 coordinates = table.toControl(coordinates);
143 LVHITTESTINFO pinfo = new LVHITTESTINFO();
144 pinfo.x = coordinates.x;
145 pinfo.y = coordinates.y;
146 OS.SendMessage(handle, OS.LVM_HITTEST, 0, pinfo);
147 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
148 scrollBeginTime = 0;
149 scrollIndex = -1;
150 } else {
151 if (pinfo.iItem !is -1 && scrollIndex is pinfo.iItem && scrollBeginTime !is 0) {
152 if (System.currentTimeMillis() >= scrollBeginTime) {
153 int top = Math.max (0, OS.SendMessage (handle, OS.LVM_GETTOPINDEX, 0, 0));
154 int count = OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0);
155 int index = (scrollIndex - 1 < top) ? Math.max(0, scrollIndex - 1) : Math.min(count - 1, scrollIndex + 1);
156 bool scroll = true;
157 if (pinfo.iItem is top) {
158 scroll = pinfo.iItem !is index;
159 } else {
160 RECT itemRect = new RECT ();
161 itemRect.left = OS.LVIR_BOUNDS;
162 if (OS.SendMessage (handle, OS.LVM_GETITEMRECT, pinfo.iItem, itemRect) !is 0) {
163 RECT rect = new RECT ();
164 OS.GetClientRect (handle, rect);
165 POINT pt = new POINT ();
166 pt.x = itemRect.left;
167 pt.y = itemRect.top;
168 if (OS.PtInRect (rect, pt)) {
169 pt.y = itemRect.bottom;
170 if (OS.PtInRect (rect, pt)) scroll = false;
171 }
172 }
173 }
174 if (scroll) {
175 OS.SendMessage (handle, OS.LVM_ENSUREVISIBLE, index, 0);
176 table.redraw();
177 }
178 scrollBeginTime = 0;
179 scrollIndex = -1;
180 }
181 } else {
182 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
183 scrollIndex = pinfo.iItem;
184 }
185 }
186
187 if (pinfo.iItem !is -1 && (effect & DND.FEEDBACK_SELECT) !is 0) {
188 TableItem item = table.getItem(pinfo.iItem);
189 if (dropHighlight !is item) {
190 LVITEM lvItem = new LVITEM();
191 lvItem.stateMask = OS.LVIS_DROPHILITED;
192 OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);
193 lvItem.state = OS.LVIS_DROPHILITED;
194 OS.SendMessage(handle, OS.LVM_SETITEMSTATE, pinfo.iItem, lvItem);
195 dropHighlight = item;
196 }
197 } else {
198 if (dropHighlight !is null) {
199 LVITEM lvItem = new LVITEM ();
200 lvItem.stateMask = OS.LVIS_DROPHILITED;
201 OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);
202 dropHighlight = null;
203 }
204 }
205 }
206 }