Mercurial > projects > dwt-win
annotate dwt/dnd/DropTargetEffect.d @ 213:36f5cb12e1a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 17 May 2008 17:34:28 +0200 |
parents | 242e33c0e383 |
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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.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; |
213 | 21 import dwt.widgets.TableItem; |
135
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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 * |
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58 * @since 3.3 |
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59 */ |
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60 public class DropTargetEffect : DropTargetAdapter { |
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61 Control control; |
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62 |
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63 /** |
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64 * Creates a new <code>DropTargetEffect</code> to handle the drag under effect on the specified |
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65 * <code>Control</code>. |
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66 * |
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67 * @param control the <code>Control</code> over which the user positions the cursor to drop the data |
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68 * |
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69 * @exception IllegalArgumentException <ul> |
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70 * <li>ERROR_NULL_ARGUMENT - if the control is null</li> |
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71 * </ul> |
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72 */ |
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73 public this(Control control) { |
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74 if (control is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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75 this.control = control; |
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76 } |
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77 |
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78 /** |
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79 * Returns the Control which is registered for this DropTargetEffect. This is the control over which the |
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80 * user positions the cursor to drop the data. |
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81 * |
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82 * @return the Control which is registered for this DropTargetEffect |
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83 */ |
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84 public Control getControl() { |
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85 return control; |
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86 } |
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87 |
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88 /** |
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89 * Returns the item at the given x-y coordinate in the receiver |
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90 * or null if no such item exists. The x-y coordinate is in the |
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91 * display relative coordinates. |
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92 * |
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93 * @param x the x coordinate used to locate the item |
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94 * @param y the y coordinate used to locate the item |
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95 * @return the item at the given x-y coordinate, or null if the coordinate is not in a selectable item |
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96 */ |
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97 public Widget getItem(int x, int y) { |
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98 if ( auto table = cast(Table)control ) { |
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99 return getItem(table, x, y); |
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100 } |
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101 if ( auto tree = cast(Tree)control ) { |
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102 return getItem(tree, x, y); |
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103 } |
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104 return null; |
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105 } |
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106 |
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107 Widget getItem(Table table, int x, int y) { |
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108 Point coordinates = new Point(x, y); |
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109 coordinates = table.toControl(coordinates); |
213 | 110 TableItem item = table.getItem(coordinates); |
111 if (item !is null) return item; | |
112 Rectangle area = table.getClientArea(); | |
113 int tableBottom = area.y + area.height; | |
114 int itemCount = table.getItemCount(); | |
115 for (int i=table.getTopIndex(); i<itemCount; i++) { | |
116 item = table.getItem(i); | |
117 Rectangle rect = item.getBounds(); | |
118 rect.x = area.x; | |
119 rect.width = area.width; | |
120 if (rect.contains(coordinates)) return item; | |
121 if (rect.y > tableBottom) break; | |
135
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122 } |
213 | 123 return null; |
135
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124 } |
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125 |
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126 Widget getItem(Tree tree, int x, int y) { |
213 | 127 Point point = new Point(x, y); |
128 point = tree.toControl(point); | |
129 TreeItem item = tree.getItem(point); | |
135
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130 if (item is null) { |
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131 Rectangle area = tree.getClientArea(); |
213 | 132 if (area.contains(point)) { |
133 int treeBottom = area.y + area.height; | |
134 item = tree.getTopItem(); | |
135 while (item !is null) { | |
136 Rectangle rect = item.getBounds(); | |
137 int itemBottom = rect.y + rect.height; | |
138 if (rect.y <= point.y && point.y < itemBottom) return item; | |
139 if (itemBottom > treeBottom) break; | |
140 item = nextItem(tree, item); | |
135
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141 } |
213 | 142 return null; |
135
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143 } |
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144 } |
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145 return item; |
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146 } |
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147 |
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148 TreeItem nextItem(Tree tree, TreeItem item) { |
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149 if (item is null) return null; |
213 | 150 if (item.getExpanded() && item.getItemCount() > 0) return item.getItem(0); |
135
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151 TreeItem childItem = item; |
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152 TreeItem parentItem = childItem.getParentItem(); |
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153 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); |
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154 int count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount(); |
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155 while (true) { |
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156 if (index + 1 < count) return parentItem is null ? tree.getItem(index + 1) : parentItem.getItem(index + 1); |
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157 if (parentItem is null) return null; |
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158 childItem = parentItem; |
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159 parentItem = childItem.getParentItem(); |
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160 index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); |
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161 count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount(); |
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162 } |
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163 } |
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164 |
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165 TreeItem previousItem(Tree tree, TreeItem item) { |
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166 if (item is null) return null; |
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167 TreeItem childItem = item; |
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168 TreeItem parentItem = childItem.getParentItem(); |
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169 int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); |
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170 if (index is 0) return parentItem; |
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171 TreeItem nextItem = parentItem is null ? tree.getItem(index-1) : parentItem.getItem(index-1); |
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172 int count = nextItem.getItemCount(); |
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173 while (count > 0 && nextItem.getExpanded()) { |
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174 nextItem = nextItem.getItem(count - 1); |
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175 count = nextItem.getItemCount(); |
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176 } |
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177 return nextItem; |
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178 } |
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179 } |