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annotate dwt/dnd/TableDropTargetEffect.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.TableDropTargetEffect;
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.graphics.Point;
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16 import dwt.graphics.Rectangle;
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17 import dwt.widgets.Table;
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18 import dwt.widgets.TableItem;
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20 /**
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21 * This class provides a default drag under effect (eg. select, insert and scroll)
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22 * when a drag occurs over a <code>Table</code>.
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23 *
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24 * <p>Classes that wish to provide their own drag under effect for a <code>Table</code>
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25 * can extend the <code>TableDropTargetEffect</code> and override any applicable methods
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26 * in <code>TableDropTargetEffect</code> to display their own drag under effect.</p>
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27 *
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28 * Subclasses that override any methods of this class must call the corresponding
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29 * <code>super</code> method to get the default drag under effect implementation.
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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_SELECT, FEEDBACK_SCROLL</dd>
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41 * </dl>
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42 * </p>
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43 *
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44 * @see DropTargetAdapter
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45 * @see DropTargetEvent
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46 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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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 TableDropTargetEffect extends DropTargetEffect {
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51 static final int SCROLL_HYSTERESIS = 150; // milli seconds
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53 TableItem scrollItem;
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54 long scrollBeginTime;
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55 // DataBrowserCallbacks callbacks = null;
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56
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57 // static Callback AcceptDragProc;
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58 // static {
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59 // AcceptDragProc = new Callback(TableDropTargetEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$
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60 // int acceptDragProc = AcceptDragProc.getAddress();
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61 // if (acceptDragProc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
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62 // }
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63
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64 // static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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65 // DropTarget target = FindDropTarget(theControl, theDrag);
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66 // if (target is null) return 0;
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67 // return (target.feedback & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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68 // }
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69
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70 // static DropTarget FindDropTarget(int theControl, int theDrag) {
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71 // if (theControl is 0) return null;
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72 // Display display = Display.findDisplay(Thread.currentThread());
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73 // if (display is null || display.isDisposed()) return null;
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74 // Widget widget = display.findWidget(theControl);
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75 // if (widget is null) return null;
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76 // return (DropTarget)widget.getData(DND.DROP_TARGET_KEY);
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77 // }
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78
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79 /**
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80 * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified
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81 * <code>Table</code>.
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82 *
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83 * @param table the <code>Table</code> over which the user positions the cursor to drop the data
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84 */
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85 public TableDropTargetEffect(Table table) {
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86 super(table);
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87 }
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88
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89 int checkEffect(int effect) {
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90 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
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91 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
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92 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
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93 return effect;
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94 }
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95
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96 /**
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97 * This implementation of <code>dragEnter</code> provides a default drag under effect
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98 * for the feedback specified in <code>event.feedback</code>.
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99 *
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100 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
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101 *
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102 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
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103 * to get the default drag under effect implementation.
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104 *
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105 * @param event the information associated with the drag enter event
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106 *
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107 * @see DropTargetAdapter
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108 * @see DropTargetEvent
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109 */
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110 public void dragEnter(DropTargetEvent event) {
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111 // if (callbacks is null) {
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112 // Table table = (Table) control;
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113 // DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
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114 // OS.GetDataBrowserCallbacks (table.handle, callbacks);
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115 // callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress();
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116 // OS.SetDataBrowserCallbacks(table.handle, callbacks);
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117 // }
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118 scrollBeginTime = 0;
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119 scrollItem = null;
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120 }
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121
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122 /**
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123 * This implementation of <code>dragLeave</code> provides a default drag under effect
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124 * for the feedback specified in <code>event.feedback</code>.
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125 *
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126 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
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127 *
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128 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
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129 * to get the default drag under effect implementation.
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130 *
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131 * @param event the information associated with the drag leave event
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132 *
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133 * @see DropTargetAdapter
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134 * @see DropTargetEvent
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135 */
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136 public void dragLeave(DropTargetEvent event) {
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137 scrollBeginTime = 0;
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138 scrollItem = null;
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139 }
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140
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141 /**
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142 * This implementation of <code>dragOver</code> provides a default drag under effect
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143 * for the feedback specified in <code>event.feedback</code>. The class description
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144 * lists the FEEDBACK constants that are applicable to the class.
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145 *
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146 * For additional information see <code>DropTargetAdapter.dragOver</code>.
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147 *
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148 * Subclasses that override this method should call <code>super.dragOver(event)</code>
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149 * to get the default drag under effect implementation.
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150 *
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151 * @param event the information associated with the drag over event
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152 *
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153 * @see DropTargetAdapter
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154 * @see DropTargetEvent
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155 * @see DND#FEEDBACK_SELECT
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156 * @see DND#FEEDBACK_SCROLL
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157 */
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158 public void dragOver(DropTargetEvent event) {
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159 Table table = (Table) control;
0
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160 int effect = checkEffect(event.feedback);
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161
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162 TableItem item = (TableItem)getItem(table, event.x, event.y);
0
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163
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164 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
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165 scrollBeginTime = 0;
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166 scrollItem = null;
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167 } else {
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168 if (item !is null && item.equals(scrollItem) && scrollBeginTime !is 0) {
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169 if (System.currentTimeMillis() >= scrollBeginTime) {
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170 Rectangle area = table.getClientArea();
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171 int headerHeight = table.getHeaderHeight();
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172 int itemHeight= table.getItemHeight();
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173 Point pt = new Point(event.x, event.y);
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174 pt = table.getDisplay().map(null, table, pt);
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175 TableItem nextItem = null;
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176 if (pt.y < area.y + headerHeight + 2 * itemHeight) {
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177 int index = Math.max(0, table.indexOf(item)-1);
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178 nextItem = table.getItem(index);
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179 }
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180 if (pt.y > area.y + area.height - 2 * itemHeight) {
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181 int index = Math.min(table.getItemCount()-1, table.indexOf(item)+1);
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182 nextItem = table.getItem(index);
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183 }
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184 if (nextItem !is null) table.showItem(nextItem);
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185 scrollBeginTime = 0;
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186 scrollItem = null;
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187 }
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188 } else {
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189 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
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190 scrollItem = item;
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191 }
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192 }
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193
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194 // store current effect for selection feedback
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195 ((DropTarget)event.widget).feedback = effect;
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196 }
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197 }