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annotate dwt/dnd/DND.d @ 135:242e33c0e383

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Added dnd source, ByteArrayTransfer,Clipboard completed
author Frank Benoit <benoit@tionex.de>
date Wed, 13 Feb 2008 04:51:22 +0100
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children ab60f3309436
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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 * 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.DND;
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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.DWTError;
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18 import dwt.DWTException;
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19
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20 import tango.util.Convert;
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21
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22 /**
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23 *
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24 * Class DND contains all the constants used in defining a
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25 * DragSource or a DropTarget.
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26 *
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27 */
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28 public class DND {
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29
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30 /**
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31 * The transfer mechanism for data that is being cut
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32 * and then pasted or copied and then pasted (value is 1).
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33 *
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34 * @see Clipboard
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35 *
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36 * @since 3.1
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37 */
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38 public const static int CLIPBOARD = 1 << 0;
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39
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40 /**
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41 * The transfer mechanism for clients that use the selection
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42 * mechanism (value is 2).
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43 *
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44 * @see Clipboard
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45 *
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46 * @since 3.1
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47 */
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48 public const static int SELECTION_CLIPBOARD = 1 << 1;
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49
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50 /**
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51 * Drag and Drop Operation: no drag/drop operation performed
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52 * (value is 0).
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53 */
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54 public const static int DROP_NONE = 0;
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55
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56 /**
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57 * Drag and Drop Operation: a copy of the data in the drag source is
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58 * added to the drop target (value is 1 &lt;&lt; 0).
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59 */
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60 public const static int DROP_COPY = 1 << 0;
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61
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62 /**
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63 * Drag and Drop Operation: a copy of the data is added to the drop target and
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64 * the original data is removed from the drag source (value is 1 &lt;&lt; 1).
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65 */
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66 public const static int DROP_MOVE = 1 << 1;
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67
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68 /**
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69 * Drag and Drop Operation: the drop target makes a link to the data in
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70 * the drag source (value is 1 &lt;&lt; 2).
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71 */
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72 public const static int DROP_LINK = 1 << 2;
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73
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74 /**
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75 * Drag and Drop Operation: the drop target moves the data and the drag source removes
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76 * any references to the data and updates its display. This is not available on all platforms
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77 * and is only used when a non-DWT application is the drop target. In this case, the DWT
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78 * drag source is informed in the dragFinished event that the drop target has moved the data.
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79 * (value is 1 &lt;&lt; 3).
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80 *
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81 * @see DragSourceListener#dragFinished
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82 */
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83 public const static int DROP_TARGET_MOVE = 1 << 3;
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84
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85 /**
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86 * Drag and Drop Operation: During a dragEnter event or a dragOperationChanged, if no modifier keys
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87 * are pressed, the operation is set to DROP_DEFAULT. The application can choose what the default
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88 * operation should be by setting a new value in the operation field. If no value is choosen, the
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89 * default operation for the platform will be selected (value is 1 &lt;&lt; 4).
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90 *
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91 * @see DropTargetListener#dragEnter
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92 * @see DropTargetListener#dragOperationChanged
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93 * @since 2.0
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94 */
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95 public const static int DROP_DEFAULT = 1 << 4;
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96
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97 /**
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98 * DragSource Event: the drop has successfully completed or has been terminated (such as hitting
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99 * the ESC key); perform cleanup such as removing data on a move operation (value is 2000).
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100 */
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101 public static const int DragEnd = 2000;
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102
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103 /**
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104 * DragSource Event: the data to be dropped is required from the drag source (value is 2001).
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105 */
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106 public static const int DragSetData = 2001;
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107
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108 /**
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109 * DropTarget Event: the cursor has entered the drop target boundaries (value is 2002).
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110 */
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111 public static const int DragEnter = 2002;
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112
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113 /**
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114 * DropTarget Event: the cursor has left the drop target boundaries OR the drop
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115 * operation has been cancelled (such as by hitting ECS) OR the drop is about to
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116 * happen (user has released the mous ebutotn over this target) (value is 2003).
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117 */
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118 public static const int DragLeave = 2003;
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119
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120 /**
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121 * DropTarget Event: the cursor is over the drop target (value is 2004).
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122 */
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123 public static const int DragOver = 2004;
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124
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125 /**
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126 * DropTarget Event: the operation being performed has changed usually due to the user
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127 * changing the selected modifier keys while dragging (value is 2005).
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128 */
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129 public static const int DragOperationChanged = 2005;
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130
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131 /**
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132 * DropTarget Event: the data has been dropped (value is 2006).
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133 */
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134 public static const int Drop = 2006;
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135
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136 /**
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137 * DropTarget Event: the drop target is given a last chance to modify the drop (value is 2007).
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138 */
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139 public static const int DropAccept = 2007;
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140
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141 /**
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142 * DragSource Event: a drag is about to begin (value is 2008).
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143 */
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144 public static const int DragStart = 2008;
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145
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146 /**
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147 * DropTarget drag under effect: No effect is shown (value is 0).
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148 */
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149 public static const int FEEDBACK_NONE = 0;
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150
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151 /**
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152 * DropTarget drag under effect: The item under the cursor is selected; applies to tables
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153 * and trees (value is 1).
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154 */
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155 public static const int FEEDBACK_SELECT = 1;
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156
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157 /**
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158 * DropTarget drag under effect: An insertion mark is shown before the item under the cursor; applies to
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159 * trees (value is 2).
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160 */
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161 public static const int FEEDBACK_INSERT_BEFORE = 2;
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162
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163 /**
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164 * DropTarget drag under effect:An insertion mark is shown after the item under the cursor; applies to
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165 * trees (value is 4).
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166 */
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167 public static const int FEEDBACK_INSERT_AFTER = 4;
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168
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169 /**
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170 * DropTarget drag under effect: The widget is scrolled up or down to allow the user to drop on items that
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171 * are not currently visible; applies to tables and trees (value is 8).
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172 */
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173 public static const int FEEDBACK_SCROLL = 8;
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174
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175 /**
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176 * DropTarget drag under effect: The item currently under the cursor is expanded to allow the user to
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177 * select a drop target from a sub item; applies to trees (value is 16).
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178 */
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179 public static const int FEEDBACK_EXPAND = 16;
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180
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181 /**
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182 * Error code: drag source can not be initialized (value is 2000).
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183 */
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184 public static const int ERROR_CANNOT_INIT_DRAG = 2000;
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185
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186 /**
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187 * Error code: drop target cannot be initialized (value is 2001).
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188 */
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189 public static const int ERROR_CANNOT_INIT_DROP = 2001;
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190
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191 /**
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192 * Error code: Data can not be set on system clipboard (value is 2002).
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193 */
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194 public static const int ERROR_CANNOT_SET_CLIPBOARD = 2002;
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195
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196 /**
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197 * Error code: Data does not have correct format for type (value is 2003).
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198 * @since 3.1
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199 */
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200 public static const int ERROR_INVALID_DATA = 2003;
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201
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202
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203 static const char[] INIT_DRAG_MESSAGE = "Cannot initialize Drag"; //$NON-NLS-1$
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204 static const char[] INIT_DROP_MESSAGE = "Cannot initialize Drop"; //$NON-NLS-1$
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205 static const char[] CANNOT_SET_CLIPBOARD_MESSAGE = "Cannot set data in clipboard"; //$NON-NLS-1$
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206 static const char[] INVALID_DATA_MESSAGE = "Data does not have correct format for type"; //$NON-NLS-1$
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207
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208 /**
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209 * Throws an appropriate exception based on the passed in error code.
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210 *
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211 * @param code the DND error code
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212 */
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213 public static void error (int code) {
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214 error (code, 0);
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215 }
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216
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217 /**
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218 * Throws an appropriate exception based on the passed in error code.
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219 * The <code>hresult</code> argument should be either 0, or the
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220 * platform specific error code.
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221 * <p>
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222 * In DND, errors are reported by throwing one of three exceptions:
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223 * <dl>
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224 * <dd>java.lang.IllegalArgumentException</dd>
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225 * <dt>thrown whenever one of the API methods is invoked with an illegal argument</dt>
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226 * <dd>org.eclipse.swt.DWTException (extends java.lang.RuntimeException)</dd>
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227 * <dt>thrown whenever a recoverable error happens internally in DWT</dt>
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228 * <dd>org.eclipse.swt.DWTError (extends java.lang.Error)</dd>
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229 * <dt>thrown whenever a <b>non-recoverable</b> error happens internally in DWT</dt>
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230 * </dl>
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231 * This method provides the logic which maps between error codes
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232 * and one of the above exceptions.
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233 * </p>
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234 *
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235 * @param code the DND error code.
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236 * @param hresult the platform specific error code.
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237 *
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238 * @see DWTError
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239 * @see DWTException
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240 * @see IllegalArgumentException
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241 */
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242 public static void error (int code, int hresult) {
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243 switch (code) {
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244 /* OS Failure/Limit (fatal, may occur only on some platforms) */
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245 case DND.ERROR_CANNOT_INIT_DRAG:{
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246 char[] msg = DND.INIT_DRAG_MESSAGE;
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247 if (hresult !is 0) msg ~= " result = "~to!(char[])(hresult); //$NON-NLS-1$
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248 throw new DWTError (code, msg);
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249 }
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250 case DND.ERROR_CANNOT_INIT_DROP:{
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251 char[] msg = DND.INIT_DROP_MESSAGE;
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252 if (hresult !is 0) msg ~= " result = "~to!(char[])(hresult); //$NON-NLS-1$
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253 throw new DWTError (code, msg);
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254 }
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255 case DND.ERROR_CANNOT_SET_CLIPBOARD:{
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256 char[] msg = DND.CANNOT_SET_CLIPBOARD_MESSAGE;
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257 if (hresult !is 0) msg ~= " result = "~to!(char[])(hresult); //$NON-NLS-1$
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258 throw new DWTError (code, msg);
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259 }
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260 case DND.ERROR_INVALID_DATA:{
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261 char[] msg = DND.INVALID_DATA_MESSAGE;
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262 if (hresult !is 0) msg ~= " result = "~to!(char[])(hresult); //$NON-NLS-1$
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263 throw new DWTException (code, msg);
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264 }
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265 default:
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266 }
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267
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268 /* Unknown/Undefined Error */
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269 DWT.error(code);
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270 }
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271
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272 }