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annotate dwt/dnd/DropTargetEffect.d @ 7:e831403a80a9

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Add 'cast' to casts
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:30:35 +0200
parents 1a8b3cb347e0
children a9ab4c738ed8
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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 *******************************************************************************/
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11 module dwt.dnd;
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12
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13 import dwt.*;
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14 import dwt.graphics.*;
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15 import dwt.widgets.*;
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16
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17
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18 /**
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19 * This class provides a default drag under effect during a drag and drop.
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20 * The current implementation does not provide any visual feedback.
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21 *
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22 * <p>The drop target effect has the same API as the
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23 * <code>DropTargetAdapter</code> so that it can provide custom visual
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24 * feedback when a <code>DropTargetEvent</code> occurs.
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25 * </p>
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26 *
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27 * <p>Classes that wish to provide their own drag under effect
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28 * can extend the <code>DropTargetEffect</code> and override any applicable methods
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29 * in <code>DropTargetAdapter</code> to display their own drag under effect.</p>
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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_EXPAND, FEEDBACK_INSERT_AFTER, FEEDBACK_INSERT_BEFORE,
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41 * FEEDBACK_NONE, FEEDBACK_SELECT, FEEDBACK_SCROLL</dd>
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42 * </dl>
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43 * </p>
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44 *
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45 * @see DropTargetAdapter
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46 * @see DropTargetEvent
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47 *
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48 * @since 3.3
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49 */
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50 public class DropTargetEffect : DropTargetAdapter {
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51 Control control;
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52
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53 /**
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54 * Creates a new <code>DropTargetEffect</code> to handle the drag under effect on the specified
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55 * <code>Control</code>.
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56 *
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57 * @param control the <code>Control</code> over which the user positions the cursor to drop the data
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58 *
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59 * @exception IllegalArgumentException <ul>
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60 * <li>ERROR_NULL_ARGUMENT - if the control is null</li>
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61 * </ul>
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62 */
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63 public this(Control control) {
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64 if (control is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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65 this.control = control;
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66 }
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67
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68 /**
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69 * Returns the Control which is registered for this DropTargetEffect. This is the control over which the
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70 * user positions the cursor to drop the data.
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71 *
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72 * @return the Control which is registered for this DropTargetEffect
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73 */
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74 public Control getControl() {
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75 return control;
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76 }
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77
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78 /**
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79 * Returns the item at the given x-y coordinate in the receiver
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80 * or null if no such item exists. The x-y coordinate is in the
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81 * display relative coordinates.
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82 *
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83 * @param x the x coordinate used to locate the item
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84 * @param y the y coordinate used to locate the item
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85 * @return the item at the given x-y coordinate, or null if the coordinate is not in a selectable item
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86 */
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87 public Widget getItem(int x, int y) {
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88 if (control instanceof Table) {
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89 return getItem(cast(Table) control, x, y);
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90 }
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91 if (control instanceof Tree) {
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92 return getItem(cast(Tree) control, x, y);
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93 }
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94 return null;
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95 }
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96
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97 Widget getItem(Table table, int x, int y) {
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98 Point coordinates = new Point(x, y);
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99 coordinates = table.toControl(coordinates);
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100 TableItem item = table.getItem(coordinates);
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101 if (item !is null) return item;
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102 Rectangle area = table.getClientArea();
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103 int tableBottom = area.y + area.height;
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104 int itemCount = table.getItemCount();
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105 for (int i=table.getTopIndex(); i<itemCount; i++) {
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106 item = table.getItem(i);
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107 Rectangle rect = item.getBounds();
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108 rect.x = area.x;
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109 rect.width = area.width;
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110 if (rect.contains(coordinates)) return item;
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111 if (rect.y > tableBottom) break;
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112 }
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113 return null;
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114 }
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115
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116 Widget getItem(Tree tree, int x, int y) {
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117 Point point = new Point(x, y);
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118 point = tree.toControl(point);
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119 TreeItem item = tree.getItem(point);
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120 if (item is null) {
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121 Rectangle area = tree.getClientArea();
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122 if (area.contains(point)) {
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123 int treeBottom = area.y + area.height;
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124 item = tree.getTopItem();
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125 while (item !is null) {
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126 Rectangle rect = item.getBounds();
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127 int itemBottom = rect.y + rect.height;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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128 if (rect.y <= point.y && point.y < itemBottom) return item;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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129 if (itemBottom > treeBottom) break;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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130 item = nextItem(tree, item);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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131 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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132 return null;
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parents:
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133 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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134 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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135 return item;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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136 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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137
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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138 TreeItem nextItem(Tree tree, TreeItem item) {
380af2bdd8e5 Upload of whole dwt tree
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parents:
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139 if (item is null) return null;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
140 if (item.getExpanded() && item.getItemCount() > 0) return item.getItem(0);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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141 TreeItem childItem = item;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
142 TreeItem parentItem = childItem.getParentItem();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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143 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
380af2bdd8e5 Upload of whole dwt tree
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parents:
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144 int count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
145 while (true) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
146 if (index + 1 < count) return parentItem is null ? tree.getItem(index + 1) : parentItem.getItem(index + 1);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
147 if (parentItem is null) return null;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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148 childItem = parentItem;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
149 parentItem = childItem.getParentItem();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
150 index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
151 count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
152 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
153 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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154
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
155 TreeItem previousItem(Tree tree, TreeItem item) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
156 if (item is null) return null;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
157 TreeItem childItem = item;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
158 TreeItem parentItem = childItem.getParentItem();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
159 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
160 if (index is 0) return parentItem;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
161 TreeItem nextItem = parentItem is null ? tree.getItem(index-1) : parentItem.getItem(index-1);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
162 int count = nextItem.getItemCount();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
163 while (count > 0 && nextItem.getExpanded()) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
164 nextItem = nextItem.getItem(count - 1);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
165 count = nextItem.getItemCount();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
166 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
167 return nextItem;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
168 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
169 }