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annotate dwt/dnd/TreeDropTargetEffect.d @ 45:d8635bb48c7c

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Merge with SWT 3.5
author Jacob Carlborg <doob@me.com>
date Mon, 01 Dec 2008 17:07:00 +0100
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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 module dwt.dnd.TreeDropTargetEffect;
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13 import dwt.dwthelper.utils;
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15 import dwt.DWT;
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16 import dwt.graphics.Point;
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17 import dwt.graphics.Rectangle;
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18 import dwt.widgets.Event;
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19 import dwt.widgets.Tree;
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20 import dwt.widgets.TreeItem;
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22 /**
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23 * This class provides a default drag under effect (eg. select, insert, scroll and expand)
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24 * when a drag occurs over a <code>Tree</code>.
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25 *
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26 * <p>Classes that wish to provide their own drag under effect for a <code>Tree</code>
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27 * can extend the <code>TreeDropTargetEffect</code> class and override any applicable methods
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28 * in <code>TreeDropTargetEffect</code> to display their own drag under effect.</p>
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29 *
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30 * Subclasses that override any methods of this class must call the corresponding
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31 * <code>super</code> method to get the default drag under effect implementation.
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32 *
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33 * <p>The feedback value is either one of the FEEDBACK constants defined in
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34 * class <code>DND</code> which is applicable to instances of this class,
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35 * or it must be built by <em>bitwise OR</em>'ing together
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36 * (that is, using the <code>int</code> "|" operator) two or more
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37 * of those <code>DND</code> effect constants.
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38 * </p>
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39 * <p>
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40 * <dl>
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41 * <dt><b>Feedback:</b></dt>
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42 * <dd>FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE, FEEDBACK_INSERT_AFTER, FEEDBACK_EXPAND, FEEDBACK_SCROLL</dd>
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43 * </dl>
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44 * </p><p>
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45 * Note: Only one of the styles FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE or
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46 * FEEDBACK_INSERT_AFTER may be specified.
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47 * </p>
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48 *
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49 * @see DropTargetAdapter
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50 * @see DropTargetEvent
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51 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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52 *
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53 * @since 3.3
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54 */
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55 public class TreeDropTargetEffect extends DropTargetEffect {
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56 static final int SCROLL_HYSTERESIS = 150; // milli seconds
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57 static final int EXPAND_HYSTERESIS = 1000; // milli seconds
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58
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59 int currentEffect = DND.FEEDBACK_NONE;
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60 TreeItem currentItem;
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61
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62 TreeItem insertItem = null;
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63 bool insertBefore = false;
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64
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65 TreeItem scrollItem;
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66 long scrollBeginTime;
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67
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68 TreeItem expandItem;
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69 long expandBeginTime;
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70
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71 // DataBrowserCallbacks callbacks = null;
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72
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73 int acceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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74 return (currentEffect & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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75 }
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76
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77 // static Callback AcceptDragProc;
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78 // static {
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79 // AcceptDragProc = new Callback(TreeDropTargetEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$
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80 // int acceptDragProc = AcceptDragProc.getAddress();
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81 // if (acceptDragProc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
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82 // }
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83
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84 // static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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85 // DropTarget target = FindDropTarget(theControl, theDrag);
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86 // if (target is null) return 0;
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87 // return (target.feedback & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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88 // }
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89
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90 // static DropTarget FindDropTarget(int theControl, int theDrag) {
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91 // if (theControl is 0) return null;
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92 // Display display = Display.findDisplay(Thread.currentThread());
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93 // if (display is null || display.isDisposed()) return null;
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94 // Widget widget = display.findWidget(theControl);
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95 // if (widget is null) return null;
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96 // return (DropTarget)widget.getData(DND.DROP_TARGET_KEY);
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97 // }
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98
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99 /**
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100 * Creates a new <code>TreeDropTargetEffect</code> to handle the drag under effect on the specified
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101 * <code>Tree</code>.
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102 *
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103 * @param tree the <code>Tree</code> over which the user positions the cursor to drop the data
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104 */
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105 public TreeDropTargetEffect(Tree tree) {
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106 super(tree);
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107 }
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108
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109 int checkEffect(int effect) {
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110 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
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111 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
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112 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
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113 return effect;
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114 }
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115
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116 /**
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117 * This implementation of <code>dragEnter</code> provides a default drag under effect
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118 * for the feedback specified in <code>event.feedback</code>.
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119 *
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120 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
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121 *
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122 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
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123 * to get the default drag under effect implementation.
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124 *
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125 * @param event the information associated with the drag enter event
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126 *
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127 * @see DropTargetAdapter
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128 * @see DropTargetEvent
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129 */
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130 public void dragEnter(DropTargetEvent event) {
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131 // if (callbacks is null) {
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132 // Tree table = (Tree) control;
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133 // DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
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134 // OS.GetDataBrowserCallbacks (table.handle, callbacks);
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135 // callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress();
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136 // OS.SetDataBrowserCallbacks(table.handle, callbacks);
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137 // }
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138 insertItem = null;
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139 expandBeginTime = 0;
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140 expandItem = null;
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141 scrollBeginTime = 0;
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142 scrollItem = null;
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143 }
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144
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145 /**
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146 * This implementation of <code>dragLeave</code> provides a default drag under effect
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147 * for the feedback specified in <code>event.feedback</code>.
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148 *
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149 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
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150 *
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151 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
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152 * to get the default drag under effect implementation.
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153 *
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154 * @param event the information associated with the drag leave event
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155 *
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156 * @see DropTargetAdapter
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157 * @see DropTargetEvent
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158 */
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159 public void dragLeave(DropTargetEvent event) {
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160 Tree tree = (Tree) control;
0
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161 if (insertItem !is null) {
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162 setInsertMark(tree, null, false);
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163 insertItem = null;
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164 }
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165 expandBeginTime = 0;
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166 expandItem = null;
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167 scrollBeginTime = 0;
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168 scrollItem = null;
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169 }
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170
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171 /**
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172 * This implementation of <code>dragOver</code> provides a default drag under effect
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173 * for the feedback specified in <code>event.feedback</code>.
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174 *
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175 * For additional information see <code>DropTargetAdapter.dragOver</code>.
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176 *
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177 * Subclasses that override this method should call <code>super.dragOver(event)</code>
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178 * to get the default drag under effect implementation.
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179 *
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180 * @param event the information associated with the drag over event
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181 *
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182 * @see DropTargetAdapter
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183 * @see DropTargetEvent
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184 * @see DND#FEEDBACK_SELECT
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185 * @see DND#FEEDBACK_INSERT_BEFORE
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186 * @see DND#FEEDBACK_INSERT_AFTER
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187 * @see DND#FEEDBACK_SCROLL
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188 */
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189 public void dragOver(DropTargetEvent event) {
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190 Tree tree = (Tree) control;
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191 TreeItem item = (TreeItem)getItem(tree, event.x, event.y);
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192 int effect = checkEffect(event.feedback);
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193 if ((effect & DND.FEEDBACK_EXPAND) is 0) {
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194 expandBeginTime = 0;
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195 expandItem = null;
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196 } else {
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197 if (item !is null && item.equals(expandItem) && expandBeginTime !is 0) {
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198 if (System.currentTimeMillis() >= expandBeginTime) {
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199 if (item.getItemCount() > 0 && !item.getExpanded()) {
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200 Event e = new Event();
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201 e.x = event.x;
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202 e.y = event.y;
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203 e.item = item;
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204 e.time = (int) System.currentTimeMillis();
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205 tree.notifyListeners(DWT.Expand, e);
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206 if (item.isDisposed()) return;
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207 item.setExpanded(true);
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208 }
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209 expandBeginTime = 0;
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210 expandItem = null;
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211 }
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212 } else {
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213 expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS;
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214 expandItem = item;
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215 }
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216 }
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217
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218 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
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219 scrollBeginTime = 0;
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220 scrollItem = null;
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221 } else {
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222 if (item !is null && item.equals(scrollItem) && scrollBeginTime !is 0) {
0
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223 if (System.currentTimeMillis() >= scrollBeginTime) {
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224 Rectangle area = tree.getClientArea();
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225 int headerHeight = tree.getHeaderHeight();
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226 int itemHeight= tree.getItemHeight();
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227 Point pt = new Point(event.x, event.y);
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228 pt = tree.getDisplay().map(null, tree, pt);
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229 TreeItem nextItem = null;
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230 if (pt.y < area.y + headerHeight + 2 * itemHeight) {
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231 nextItem = previousItem(tree, item);
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232 }
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233 if (pt.y > area.y + area.height - 2 * itemHeight) {
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234 nextItem = nextItem(tree, item);
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235 }
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236 if (nextItem !is null) tree.showItem(nextItem);
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237 scrollBeginTime = 0;
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238 scrollItem = null;
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239 }
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240 } else {
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241 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
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242 scrollItem = item;
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243 }
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244 }
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245
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246 if ((effect & DND.FEEDBACK_INSERT_AFTER) !is 0 ||
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247 (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) {
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248 if (currentItem !is item ||
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249 ((effect & DND.FEEDBACK_INSERT_AFTER) !is (currentEffect & DND.FEEDBACK_INSERT_AFTER)) ||
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250 ((effect & DND.FEEDBACK_INSERT_BEFORE) !is (currentEffect & DND.FEEDBACK_INSERT_BEFORE))) {
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251 setInsertMark(tree, item, (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0);
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252 currentEffect = effect;
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253 currentItem = item;
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254 }
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255 } else {
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256 setInsertMark(tree, null, false);
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257 }
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258 // save current effect for selection feedback
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259 ((DropTarget)event.widget).feedback = effect;
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260 }
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261
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262 void setInsertMark(Tree tree, TreeItem item, bool before) {
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263 if (item is insertItem && before is insertBefore) return;
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264 insertItem = item;
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265 insertBefore = before;
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266 tree.setInsertMark(item, before);
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267 }
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268 }