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annotate dwt/dnd/TableDropTargetEffect.d @ 7:e831403a80a9

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Add 'cast' to casts
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:30:35 +0200
parents 1a8b3cb347e0
children d8635bb48c7c
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 *******************************************************************************/
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11 module dwt.dnd;
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12
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13 import dwt.DWT;
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14 import dwt.graphics.*;
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15 import dwt.internal.Callback;
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16 import dwt.internal.carbon.DataBrowserCallbacks;
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17 import dwt.internal.carbon.OS;
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18 import dwt.widgets.*;
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19
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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 *
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47 * @since 3.3
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48 */
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49 public class TableDropTargetEffect : DropTargetEffect {
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50 static final int SCROLL_HYSTERESIS = 150; // milli seconds
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51
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52 TableItem scrollItem;
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53 long scrollBeginTime;
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54 DataBrowserCallbacks callbacks = null;
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55
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56 static Callback AcceptDragProc;
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57 static {
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58 AcceptDragProc = new Callback(TableDropTargetEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$
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59 int acceptDragProc = AcceptDragProc.getAddress();
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60 if (acceptDragProc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
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61 }
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62
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63 static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
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64 DropTarget target = FindDropTarget(theControl, theDrag);
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65 if (target is null) return 0;
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66 return (target.feedback & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0;
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67 }
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68
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69 static DropTarget FindDropTarget(int theControl, int theDrag) {
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70 if (theControl is 0) return null;
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71 Display display = Display.findDisplay(Thread.currentThread());
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72 if (display is null || display.isDisposed()) return null;
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73 Widget widget = display.findWidget(theControl);
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74 if (widget is null) return null;
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75 return cast(DropTarget)widget.getData(DND.DROP_TARGET_KEY);
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76 }
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77
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78 /**
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79 * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified
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80 * <code>Table</code>.
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81 *
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82 * @param table the <code>Table</code> over which the user positions the cursor to drop the data
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83 */
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84 public this(Table table) {
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85 super(table);
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86 }
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87
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88 int checkEffect(int effect) {
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89 // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
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90 if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
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91 if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
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92 return effect;
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93 }
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94
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95 /**
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96 * This implementation of <code>dragEnter</code> provides a default drag under effect
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97 * for the feedback specified in <code>event.feedback</code>.
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98 *
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99 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
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100 *
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101 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
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102 * to get the default drag under effect implementation.
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103 *
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104 * @param event the information associated with the drag enter event
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105 *
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106 * @see DropTargetAdapter
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107 * @see DropTargetEvent
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108 */
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109 public void dragEnter(DropTargetEvent event) {
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110 if (callbacks is null) {
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111 Table table = cast(Table) control;
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112 DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
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113 OS.GetDataBrowserCallbacks (table.handle, callbacks);
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114 callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress();
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115 OS.SetDataBrowserCallbacks(table.handle, callbacks);
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116 }
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117 scrollBeginTime = 0;
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118 scrollItem = null;
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119 }
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120
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121 /**
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122 * This implementation of <code>dragLeave</code> provides a default drag under effect
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123 * for the feedback specified in <code>event.feedback</code>.
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124 *
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125 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
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126 *
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127 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
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128 * to get the default drag under effect implementation.
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129 *
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130 * @param event the information associated with the drag leave event
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131 *
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132 * @see DropTargetAdapter
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133 * @see DropTargetEvent
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134 */
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135 public void dragLeave(DropTargetEvent event) {
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136 scrollBeginTime = 0;
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137 scrollItem = null;
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138 }
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139
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140 /**
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141 * This implementation of <code>dragOver</code> provides a default drag under effect
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142 * for the feedback specified in <code>event.feedback</code>. The class description
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143 * lists the FEEDBACK constants that are applicable to the class.
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144 *
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145 * For additional information see <code>DropTargetAdapter.dragOver</code>.
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146 *
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147 * Subclasses that override this method should call <code>super.dragOver(event)</code>
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148 * to get the default drag under effect implementation.
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149 *
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150 * @param event the information associated with the drag over event
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151 *
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152 * @see DropTargetAdapter
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153 * @see DropTargetEvent
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154 * @see DND#FEEDBACK_SELECT
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155 * @see DND#FEEDBACK_SCROLL
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156 */
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157 public void dragOver(DropTargetEvent event) {
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158 Table table = cast(Table) control;
0
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159 int effect = checkEffect(event.feedback);
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160
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161 TableItem item = cast(TableItem)getItem(table, event.x, event.y);
0
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162
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163 if ((effect & DND.FEEDBACK_SCROLL) is 0) {
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164 scrollBeginTime = 0;
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165 scrollItem = null;
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166 } else {
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167 if (item !is null && item.opEquals(scrollItem) && scrollBeginTime !is 0) {
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168 if (System.currentTimeMillis() >= scrollBeginTime) {
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169 Rectangle area = table.getClientArea();
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170 int headerHeight = table.getHeaderHeight();
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171 int itemHeight= table.getItemHeight();
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172 Point pt = new Point(event.x, event.y);
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173 pt = table.getDisplay().map(null, table, pt);
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174 TableItem nextItem = null;
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175 if (pt.y < area.y + headerHeight + 2 * itemHeight) {
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176 int index = Math.max(0, table.indexOf(item)-1);
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177 nextItem = table.getItem(index);
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178 }
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179 if (pt.y > area.y + area.height - 2 * itemHeight) {
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180 int index = Math.min(table.getItemCount()-1, table.indexOf(item)+1);
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181 nextItem = table.getItem(index);
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182 }
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183 if (nextItem !is null) table.showItem(nextItem);
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184 scrollBeginTime = 0;
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185 scrollItem = null;
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186 }
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187 } else {
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188 scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
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189 scrollItem = item;
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190 }
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191 }
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192
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193 // store current effect for selection feedback
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194 (cast(DropTarget)event.widget).feedback = effect;
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195 }
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196 }