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annotate dwt/dnd/TreeDropTargetEffect.d @ 156:969e7de37c3d default tip

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Fixes to get dwt to work with dmd and ldc
author Jacob Carlborg <doob@me.com>
date Wed, 08 Jul 2009 21:56:44 +0200
parents 2d6116ea306e
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <doob@me.com>
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13 *******************************************************************************/
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14 module dwt.dnd.TreeDropTargetEffect;
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16 import dwt.dwthelper.utils;
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17
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18 import dwt.DWT;
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19 import dwt.graphics.Point;
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20 import dwt.graphics.Rectangle;
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21 import dwt.widgets.Event;
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22 import dwt.widgets.Tree;
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23 import dwt.widgets.TreeItem;
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25 import dwt.dnd.DND;
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26 import dwt.dnd.DropTarget;
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27 import dwt.dnd.DropTargetEffect;
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28 import dwt.dnd.DropTargetEvent;
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29
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30 /**
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31 * This class provides a default drag under effect (eg. select, insert, scroll and expand)
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32 * when a drag occurs over a <code>Tree</code>.
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33 *
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34 * <p>Classes that wish to provide their own drag under effect for a <code>Tree</code>
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35 * can extend the <code>TreeDropTargetEffect</code> class and override any applicable methods
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36 * in <code>TreeDropTargetEffect</code> to display their own drag under effect.</p>
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37 *
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38 * Subclasses that override any methods of this class must call the corresponding
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39 * <code>super</code> method to get the default drag under effect implementation.
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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_SELECT, FEEDBACK_INSERT_BEFORE, FEEDBACK_INSERT_AFTER, FEEDBACK_EXPAND, FEEDBACK_SCROLL</dd>
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51 * </dl>
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52 * </p><p>
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53 * Note: Only one of the styles FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE or
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54 * FEEDBACK_INSERT_AFTER may be specified.
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55 * </p>
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56 *
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57 * @see DropTargetAdapter
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58 * @see DropTargetEvent
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59 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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60 *
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61 * @since 3.3
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62 */
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63 public class TreeDropTargetEffect : DropTargetEffect {
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64 static const int SCROLL_HYSTERESIS = 150; // milli seconds
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65 static const int EXPAND_HYSTERESIS = 1000; // milli seconds
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66
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67 int currentEffect = DND.FEEDBACK_NONE;
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68 TreeItem currentItem;
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69
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70 TreeItem insertItem = null;
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71 bool insertBefore = false;
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72
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73 TreeItem scrollItem;
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74 long scrollBeginTime;
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75
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76 TreeItem expandItem;
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77 long expandBeginTime;
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78
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79 // DataBrowserCallbacks callbacks = null;
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80
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81 int acceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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82 return (currentEffect & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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83 }
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84
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85 // static Callback AcceptDragProc;
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86 // static {
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87 // AcceptDragProc = new Callback(TreeDropTargetEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$
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88 // int acceptDragProc = AcceptDragProc.getAddress();
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89 // if (acceptDragProc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
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90 // }
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91
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92 // static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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93 // DropTarget target = FindDropTarget(theControl, theDrag);
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94 // if (target is null) return 0;
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95 // return (target.feedback & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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96 // }
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97
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98 // static DropTarget FindDropTarget(int theControl, int theDrag) {
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99 // if (theControl is 0) return null;
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100 // Display display = Display.findDisplay(Thread.currentThread());
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101 // if (display is null || display.isDisposed()) return null;
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102 // Widget widget = display.findWidget(theControl);
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103 // if (widget is null) return null;
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104 // return (DropTarget)widget.getData(DND.DROP_TARGET_KEY);
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105 // }
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106
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107 /**
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108 * Creates a new <code>TreeDropTargetEffect</code> to handle the drag under effect on the specified
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109 * <code>Tree</code>.
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110 *
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111 * @param tree the <code>Tree</code> over which the user positions the cursor to drop the data
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112 */
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113 public this(Tree tree) {
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114 super(tree);
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115 }
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116
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117 int checkEffect(int effect) {
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118 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
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119 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
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120 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
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121 return effect;
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122 }
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123
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124 /**
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125 * This implementation of <code>dragEnter</code> provides a default drag under effect
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126 * for the feedback specified in <code>event.feedback</code>.
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127 *
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128 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
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129 *
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130 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
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131 * to get the default drag under effect implementation.
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132 *
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133 * @param event the information associated with the drag enter event
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134 *
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135 * @see DropTargetAdapter
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136 * @see DropTargetEvent
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137 */
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138 public void dragEnter(DropTargetEvent event) {
45
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139 // if (callbacks is null) {
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140 // Tree table = (Tree) control;
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141 // DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
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142 // OS.GetDataBrowserCallbacks (table.handle, callbacks);
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143 // callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress();
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144 // OS.SetDataBrowserCallbacks(table.handle, callbacks);
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145 // }
0
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146 insertItem = null;
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147 expandBeginTime = 0;
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148 expandItem = null;
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149 scrollBeginTime = 0;
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150 scrollItem = null;
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151 }
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152
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153 /**
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154 * This implementation of <code>dragLeave</code> provides a default drag under effect
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155 * for the feedback specified in <code>event.feedback</code>.
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156 *
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157 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
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158 *
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159 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
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160 * to get the default drag under effect implementation.
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161 *
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162 * @param event the information associated with the drag leave event
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163 *
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164 * @see DropTargetAdapter
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165 * @see DropTargetEvent
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166 */
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167 public void dragLeave(DropTargetEvent event) {
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168 Tree tree = cast(Tree) control;
0
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169 if (insertItem !is null) {
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170 setInsertMark(tree, null, false);
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171 insertItem = null;
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172 }
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173 expandBeginTime = 0;
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174 expandItem = null;
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175 scrollBeginTime = 0;
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176 scrollItem = null;
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177 }
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178
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179 /**
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180 * This implementation of <code>dragOver</code> provides a default drag under effect
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181 * for the feedback specified in <code>event.feedback</code>.
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182 *
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183 * For additional information see <code>DropTargetAdapter.dragOver</code>.
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184 *
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185 * Subclasses that override this method should call <code>super.dragOver(event)</code>
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186 * to get the default drag under effect implementation.
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187 *
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188 * @param event the information associated with the drag over event
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189 *
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190 * @see DropTargetAdapter
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191 * @see DropTargetEvent
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192 * @see DND#FEEDBACK_SELECT
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193 * @see DND#FEEDBACK_INSERT_BEFORE
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194 * @see DND#FEEDBACK_INSERT_AFTER
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195 * @see DND#FEEDBACK_SCROLL
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196 */
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197 public void dragOver(DropTargetEvent event) {
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198 Tree tree = cast(Tree) control;
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199 TreeItem item = cast(TreeItem)getItem(tree, event.x, event.y);
0
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200 int effect = checkEffect(event.feedback);
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201 if ((effect & DND.FEEDBACK_EXPAND) is 0) {
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202 expandBeginTime = 0;
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203 expandItem = null;
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204 } else {
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205 if (item !is null && item.opEquals(expandItem) && expandBeginTime !is 0) {
0
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206 if (System.currentTimeMillis() >= expandBeginTime) {
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207 if (item.getItemCount() > 0 && !item.getExpanded()) {
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208 Event e = new Event();
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209 e.x = event.x;
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210 e.y = event.y;
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211 e.item = item;
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212 e.time = cast(int) System.currentTimeMillis();
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213 tree.notifyListeners(DWT.Expand, e);
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214 if (item.isDisposed()) return;
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215 item.setExpanded(true);
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216 }
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217 expandBeginTime = 0;
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218 expandItem = null;
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219 }
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220 } else {
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221 expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS;
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222 expandItem = item;
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223 }
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224 }
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225
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226 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
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227 scrollBeginTime = 0;
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228 scrollItem = null;
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229 } else {
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230 if (item !is null && item.opEquals(scrollItem) && scrollBeginTime !is 0) {
0
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231 if (System.currentTimeMillis() >= scrollBeginTime) {
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232 Rectangle area = tree.getClientArea();
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233 int headerHeight = tree.getHeaderHeight();
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234 int itemHeight= tree.getItemHeight();
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235 Point pt = new Point(event.x, event.y);
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236 pt = tree.getDisplay().map(null, tree, pt);
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237 TreeItem nextItem_ = null;
0
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238 if (pt.y < area.y + headerHeight + 2 * itemHeight) {
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239 nextItem_ = previousItem(tree, item);
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240 }
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241 if (pt.y > area.y + area.height - 2 * itemHeight) {
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242 nextItem_ = nextItem(tree, item);
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243 }
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244 if (nextItem_ !is null) tree.showItem(nextItem_);
0
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245 scrollBeginTime = 0;
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246 scrollItem = null;
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247 }
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248 } else {
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249 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
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250 scrollItem = item;
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251 }
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252 }
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253
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254 if ((effect & DND.FEEDBACK_INSERT_AFTER) !is 0 ||
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255 (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) {
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256 if (currentItem !is item ||
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257 ((effect & DND.FEEDBACK_INSERT_AFTER) !is (currentEffect & DND.FEEDBACK_INSERT_AFTER)) ||
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258 ((effect & DND.FEEDBACK_INSERT_BEFORE) !is (currentEffect & DND.FEEDBACK_INSERT_BEFORE))) {
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259 setInsertMark(tree, item, (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0);
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260 currentEffect = effect;
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261 currentItem = item;
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262 }
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263 } else {
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264 setInsertMark(tree, null, false);
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265 }
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266 // save current effect for selection feedback
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267 (cast(DropTarget)event.widget).feedback = effect;
0
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268 }
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269
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270 void setInsertMark(Tree tree, TreeItem item, bool before) {
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271 if (item is insertItem && before is insertBefore) return;
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272 insertItem = item;
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273 insertBefore = before;
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274 tree.setInsertMark(item, before);
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275 }
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276 }