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