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