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annotate dwt/dnd/TreeDropTargetEffect.d @ 237:e2affbeb686d

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Making tango.sys.win32.Types and dwt.internal.win32.WINTYPES to match common declaration. Make ansi charactars of type ubyte.
author Frank Benoit <benoit@tionex.de>
date Thu, 19 Jun 2008 03:25:36 +0200
parents 36f5cb12e1a2
children fd9c62a2998e
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1 /*******************************************************************************
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2 * Copyright (c) 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.dnd.TreeDropTargetEffect;
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14
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15 import dwt.DWT;
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16 import dwt.graphics.Point;
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17 import dwt.internal.win32.OS;
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18 import dwt.widgets.Event;
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19 import dwt.widgets.Tree;
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20 import dwt.widgets.TreeItem;
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21
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22 import dwt.dnd.DropTargetEffect;
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23 import dwt.dnd.DropTargetEvent;
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24 import dwt.dnd.DND;
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25
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26 import dwt.dwthelper.utils;
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27
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28 /**
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29 * This class provides a default drag under effect (eg. select, insert, scroll and expand)
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30 * when a drag occurs over a <code>Tree</code>.
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31 *
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32 * <p>Classes that wish to provide their own drag under effect for a <code>Tree</code>
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33 * can extend the <code>TreeDropTargetEffect</code> class and override any applicable methods
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34 * in <code>TreeDropTargetEffect</code> to display their own drag under effect.</p>
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35 *
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36 * Subclasses that override any methods of this class must call the corresponding
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37 * <code>super</code> method to get the default drag under effect implementation.
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38 *
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39 * <p>The feedback value is either one of the FEEDBACK constants defined in
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40 * class <code>DND</code> which is applicable to instances of this class,
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41 * or it must be built by <em>bitwise OR</em>'ing together
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42 * (that is, using the <code>int</code> "|" operator) two or more
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43 * of those <code>DND</code> effect constants.
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44 * </p>
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45 * <p>
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46 * <dl>
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47 * <dt><b>Feedback:</b></dt>
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48 * <dd>FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE, FEEDBACK_INSERT_AFTER, FEEDBACK_EXPAND, FEEDBACK_SCROLL</dd>
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49 * </dl>
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50 * </p><p>
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51 * Note: Only one of the styles FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE or
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52 * FEEDBACK_INSERT_AFTER may be specified.
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53 * </p>
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54 *
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55 * @see DropTargetAdapter
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56 * @see DropTargetEvent
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57 *
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58 * @since 3.3
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59 */
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60 public class TreeDropTargetEffect : DropTargetEffect {
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61 static final int SCROLL_HYSTERESIS = 200; // milli seconds
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62 static final int EXPAND_HYSTERESIS = 1000; // milli seconds
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63
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64 int /*long*/ dropIndex;
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65 int scrollIndex;
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66 long scrollBeginTime;
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67 int /*long*/ expandIndex;
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68 long expandBeginTime;
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69 TreeItem insertItem;
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70 bool insertBefore;
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71
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72 /**
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73 * Creates a new <code>TreeDropTargetEffect</code> to handle the drag under effect on the specified
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74 * <code>Tree</code>.
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75 *
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76 * @param tree the <code>Tree</code> over which the user positions the cursor to drop the data
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77 */
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78 public this(Tree tree) {
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79 super(tree);
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80 }
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81
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82 int checkEffect(int effect) {
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83 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
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84 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
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85 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
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86 return effect;
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87 }
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88
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89 /**
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90 * This implementation of <code>dragEnter</code> provides a default drag under effect
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91 * for the feedback specified in <code>event.feedback</code>.
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92 *
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93 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
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94 *
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95 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
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96 * to get the default drag under effect implementation.
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97 *
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98 * @param event the information associated with the drag enter event
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99 *
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100 * @see DropTargetAdapter
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101 * @see DropTargetEvent
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102 */
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103 public void dragEnter(DropTargetEvent event) {
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104 dropIndex = -1;
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105 insertItem = null;
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106 expandBeginTime = 0;
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107 expandIndex = -1;
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108 scrollBeginTime = 0;
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109 scrollIndex = -1;
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110 }
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111
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112 /**
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113 * This implementation of <code>dragLeave</code> provides a default drag under effect
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114 * for the feedback specified in <code>event.feedback</code>.
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115 *
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116 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
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117 *
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118 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
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119 * to get the default drag under effect implementation.
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120 *
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121 * @param event the information associated with the drag leave event
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122 *
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123 * @see DropTargetAdapter
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124 * @see DropTargetEvent
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125 */
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126 public void dragLeave(DropTargetEvent event) {
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127 Tree tree = cast(Tree) control;
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128 auto handle = tree.handle;
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129 if (dropIndex !is -1) {
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130 TVITEM tvItem;
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131 tvItem.hItem = cast(HTREEITEM) dropIndex;
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132 tvItem.mask = OS.TVIF_STATE;
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133 tvItem.stateMask = OS.TVIS_DROPHILITED;
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134 tvItem.state = 0;
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135 OS.SendMessage (handle, OS.TVM_SETITEM, 0, &tvItem);
135
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136 dropIndex = -1;
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137 }
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138 if (insertItem !is null) {
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139 tree.setInsertMark(null, false);
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140 insertItem = null;
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141 }
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142 expandBeginTime = 0;
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diff changeset
143 expandIndex = -1;
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parents:
diff changeset
144 scrollBeginTime = 0;
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parents:
diff changeset
145 scrollIndex = -1;
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parents:
diff changeset
146 }
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parents:
diff changeset
147
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
148 /**
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parents:
diff changeset
149 * This implementation of <code>dragOver</code> provides a default drag under effect
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parents:
diff changeset
150 * for the feedback specified in <code>event.feedback</code>.
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parents:
diff changeset
151 *
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parents:
diff changeset
152 * For additional information see <code>DropTargetAdapter.dragOver</code>.
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parents:
diff changeset
153 *
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parents:
diff changeset
154 * Subclasses that override this method should call <code>super.dragOver(event)</code>
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parents:
diff changeset
155 * to get the default drag under effect implementation.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
156 *
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parents:
diff changeset
157 * @param event the information associated with the drag over event
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parents:
diff changeset
158 *
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parents:
diff changeset
159 * @see DropTargetAdapter
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parents:
diff changeset
160 * @see DropTargetEvent
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parents:
diff changeset
161 * @see DND#FEEDBACK_SELECT
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parents:
diff changeset
162 * @see DND#FEEDBACK_INSERT_BEFORE
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parents:
diff changeset
163 * @see DND#FEEDBACK_INSERT_AFTER
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Frank Benoit <benoit@tionex.de>
parents:
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164 * @see DND#FEEDBACK_SCROLL
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parents:
diff changeset
165 */
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parents:
diff changeset
166 public void dragOver(DropTargetEvent event) {
137
3665cb9211b2 DropTarget
Frank Benoit <benoit@tionex.de>
parents: 135
diff changeset
167 Tree tree = cast(Tree) getControl();
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
168 int effect = checkEffect(event.feedback);
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
169 auto handle = tree.handle;
135
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parents:
diff changeset
170 Point coordinates = new Point(event.x, event.y);
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parents:
diff changeset
171 coordinates = tree.toControl(coordinates);
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
172 TVHITTESTINFO lpht;
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
173 lpht.pt.x = coordinates.x;
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
174 lpht.pt.y = coordinates.y;
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
175 OS.SendMessage (handle, OS.TVM_HITTEST, 0, &lpht);
213
36f5cb12e1a2 Update to SWT 3.4M7
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parents: 144
diff changeset
176 auto hItem = lpht.hItem;
135
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parents:
diff changeset
177 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
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parents:
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178 scrollBeginTime = 0;
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179 scrollIndex = -1;
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parents:
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180 } else {
213
36f5cb12e1a2 Update to SWT 3.4M7
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parents: 144
diff changeset
181 if (hItem !is cast(HTREEITEM)-1 && cast(HTREEITEM)scrollIndex is hItem && scrollBeginTime !is 0) {
135
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parents:
diff changeset
182 if (System.currentTimeMillis() >= scrollBeginTime) {
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
183 auto topItem = cast(HTREEITEM)OS.SendMessage(handle, OS.TVM_GETNEXTITEM, OS.TVGN_FIRSTVISIBLE, 0);
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
184 auto nextItem = cast(HTREEITEM)OS.SendMessage(handle, OS.TVM_GETNEXTITEM, hItem is topItem ? OS.TVGN_PREVIOUSVISIBLE : OS.TVGN_NEXTVISIBLE, hItem);
135
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parents:
diff changeset
185 bool scroll = true;
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parents:
diff changeset
186 if (hItem is topItem) {
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
187 scroll = nextItem !is null;
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
188 } else {
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
189 RECT itemRect;
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
190 if (OS.TreeView_GetItemRect (handle, nextItem, &itemRect, true)) {
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
191 RECT rect;
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
192 OS.GetClientRect (handle, &rect);
35669d0d0dc5 TreeDropTargetEffect
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parents: 137
diff changeset
193 POINT pt;
135
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parents:
diff changeset
194 pt.x = itemRect.left;
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parents:
diff changeset
195 pt.y = itemRect.top;
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
196 if (OS.PtInRect (&rect, pt)) {
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
197 pt.y = itemRect.bottom;
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
198 if (OS.PtInRect (&rect, pt)) scroll = false;
135
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199 }
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parents:
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200 }
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parents:
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201 }
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Frank Benoit <benoit@tionex.de>
parents:
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202 if (scroll) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
203 OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, nextItem);
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
204 tree.redraw();
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Frank Benoit <benoit@tionex.de>
parents:
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205 }
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parents:
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206 scrollBeginTime = 0;
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parents:
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207 scrollIndex = -1;
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parents:
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208 }
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parents:
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209 } else {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
210 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
211 scrollIndex = cast(int)hItem;
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
212 }
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Frank Benoit <benoit@tionex.de>
parents:
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213 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
214 if ((effect & DND.FEEDBACK_EXPAND) is 0) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
215 expandBeginTime = 0;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
216 expandIndex = -1;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
217 } else {
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
218 if (cast(int)hItem !is -1 && expandIndex is cast(int)hItem && expandBeginTime !is 0) {
135
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
219 if (System.currentTimeMillis() >= expandBeginTime) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
220 if (OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CHILD, hItem) !is 0) {
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
221 TreeItem item = cast(TreeItem)tree.getDisplay().findWidget(tree.handle, cast(int)hItem);
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
222 if (item !is null && !item.getExpanded()) {
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
223 item.setExpanded(true);
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
224 tree.redraw();
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
225 Event expandEvent = new Event ();
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
226 expandEvent.item = item;
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
227 tree.notifyListeners(DWT.Expand, expandEvent);
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
228 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
229 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
230 expandBeginTime = 0;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
231 expandIndex = -1;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
232 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
233 } else {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
234 expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS;
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
235 expandIndex = cast(int)hItem;
135
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
236 }
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
237 }
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
238 if (dropIndex !is -1 && (dropIndex !is cast(int)hItem || (effect & DND.FEEDBACK_SELECT) is 0)) {
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
239 TVITEM tvItem;
237
e2affbeb686d Making tango.sys.win32.Types and dwt.internal.win32.WINTYPES to match common declaration. Make ansi charactars of type ubyte.
Frank Benoit <benoit@tionex.de>
parents: 213
diff changeset
240 tvItem.hItem = cast(HTREEITEM) dropIndex;
135
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
241 tvItem.mask = OS.TVIF_STATE;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
242 tvItem.stateMask = OS.TVIS_DROPHILITED;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
243 tvItem.state = 0;
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
244 OS.SendMessage (handle, OS.TVM_SETITEM, 0, &tvItem);
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
245 dropIndex = -1;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
246 }
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
247 if (cast(int)hItem !is -1 && cast(int)hItem !is dropIndex && (effect & DND.FEEDBACK_SELECT) !is 0) {
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
248 TVITEM tvItem;
237
e2affbeb686d Making tango.sys.win32.Types and dwt.internal.win32.WINTYPES to match common declaration. Make ansi charactars of type ubyte.
Frank Benoit <benoit@tionex.de>
parents: 213
diff changeset
249 tvItem.hItem = cast(HTREEITEM) hItem;
135
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parents:
diff changeset
250 tvItem.mask = OS.TVIF_STATE;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
251 tvItem.stateMask = OS.TVIS_DROPHILITED;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
252 tvItem.state = OS.TVIS_DROPHILITED;
144
35669d0d0dc5 TreeDropTargetEffect
Frank Benoit <benoit@tionex.de>
parents: 137
diff changeset
253 OS.SendMessage (handle, OS.TVM_SETITEM, 0, &tvItem);
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
254 dropIndex = cast(int)hItem;
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
255 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
256 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0 || (effect & DND.FEEDBACK_INSERT_AFTER) !is 0) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
257 bool before = (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
258 /*
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
259 * Bug in Windows. When TVM_SETINSERTMARK is used to set
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
260 * an insert mark for a tree and an item is expanded or
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
261 * collapsed near the insert mark, the tree does not redraw
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
262 * the insert mark properly. The fix is to hide and show
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
263 * the insert mark whenever an item is expanded or collapsed.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
264 * Since the insert mark can not be queried from the tree,
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
265 * use the Tree API rather than calling the OS directly.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
266 */
213
36f5cb12e1a2 Update to SWT 3.4M7
Frank Benoit <benoit@tionex.de>
parents: 144
diff changeset
267 TreeItem item = cast(TreeItem)tree.getDisplay().findWidget(tree.handle, cast(int)hItem);
135
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
268 if (item !is null) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
269 if (item !is insertItem || before !is insertBefore) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
270 tree.setInsertMark(item, before);
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
271 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
272 insertItem = item;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
273 insertBefore = before;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
274 } else {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
275 if (insertItem !is null) {
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
276 tree.setInsertMark(null, false);
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
277 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
278 insertItem = null;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
279 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
280 } else {
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
281 if (insertItem !is null) {
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
282 tree.setInsertMark(null, false);
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
283 }
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
284 insertItem = null;
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
285 }
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
286 }
242e33c0e383 Added dnd source, ByteArrayTransfer,Clipboard completed
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
287 }