Mercurial > projects > dwt-mac
annotate dwt/dnd/DropTargetListener.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | e831403a80a9 |
rev | line source |
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0
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2003 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.internal.DWTEventListener; |
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14 |
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15 /** |
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16 * The <code>DropTargetListener</code> class provides event notification to the application |
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17 * for DropTarget events. |
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18 * |
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19 * <p>As the user moves the cursor into, over and out of a Control that has been designated |
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20 * as a DropTarget, events indicate what operation can be performed and what data can be |
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21 * transferred if a drop where to occur at that point. |
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22 * The application can respond to these events and change the type of data that will |
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23 * be dropped by modifying event.currentDataType, or change the operation that will be performed |
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24 * by modifying the event.detail field or stop any drop from happening on the current target |
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25 * by setting the event.detail field to DND_DROP_NONE.</p> |
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26 * |
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27 * <p>When the user causes a drop to happen by releasing the mouse over a valid drop target, |
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28 * the application has one last chance to change the data type of the drop through the |
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29 * DropAccept event. If the drop is still allowed, the DropAccept event is immediately |
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30 * followed by the Drop event. In the Drop event, the application can still change the |
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31 * operation that is performed but the data type is fixed.</p> |
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32 * |
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33 * @see DropTargetEvent |
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34 * |
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35 */ |
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36 public interface DropTargetListener : DWTEventListener { |
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37 |
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38 /** |
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39 * The cursor has entered the drop target boundaries. |
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40 * |
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41 * <p>The following fields in the DropTargetEvent apply: |
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42 * <ul> |
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43 * <li>(in)widget |
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44 * <li>(in)time |
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45 * <li>(in)x |
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46 * <li>(in)y |
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47 * <li>(in)dataTypes |
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48 * <li>(in,out)currentDataType |
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49 * <li>(in)operations |
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50 * <li>(in,out)detail |
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51 * <li>(in,out)feedback |
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52 * </ul></p> |
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53 * |
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54 * <p>The <code>operation</code> value is determined by the modifier keys pressed by the user. |
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55 * If no keys are pressed the <code>event.detail</code> field is set to DND.DROP_DEFAULT. |
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56 * If the application does not set the <code>event.detail</code> to something other |
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57 * than <code>DND.DROP_DEFAULT</code> the operation will be set to the platform defined standard |
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58 * default.</p> |
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59 * |
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60 * <p>The <code>currentDataType</code> is determined by the first transfer agent specified in |
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61 * setTransfer() that matches a data type provided by the drag source.</p> |
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62 * |
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63 * <p>It is possible to get a DragEnter event when the drag source does not provide any matching data. |
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64 * In this case, the default operation is DND.DROP_NONE and the currentDataType is null.</p> |
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65 * |
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66 * <p>The application can change the operation that will be performed by modifying the |
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67 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code> |
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68 * field or DND.DROP_NONE.</p> |
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69 * |
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70 * <p>The application can also change the type of data being requested by |
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71 * modifying the <code>currentDataTypes</code> field but the value must be one of the values |
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72 * in the <code>dataTypes</code> list.</p> |
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73 * |
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74 * @param event the information associated with the drag enter event |
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75 * |
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76 * @see DropTargetEvent |
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77 */ |
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78 public void dragEnter(DropTargetEvent event); |
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79 |
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80 /** |
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81 * The cursor has left the drop target boundaries OR the drop has been cancelled OR the data |
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82 * is about to be dropped. |
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83 * |
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84 * <p>The following fields in the DropTargetEvent apply: |
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85 * <ul> |
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86 * <li>(in)widget |
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87 * <li>(in)time |
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88 * <li>(in)x |
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89 * <li>(in)y |
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90 * <li>(in)dataTypes |
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91 * <li>(in)currentDataType |
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92 * <li>(in)operations |
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93 * <li>(in)detail |
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94 * </ul></p> |
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95 * |
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96 * @param event the information associated with the drag leave event |
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97 * |
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98 * @see DropTargetEvent |
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99 */ |
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100 public void dragLeave(DropTargetEvent event); |
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101 |
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102 /** |
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103 * The operation being performed has changed (usually due to the user changing the selected modifier key(s) |
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104 * while dragging). |
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105 * |
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106 * <p>The following fields in the DropTargetEvent apply: |
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107 * <ul> |
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108 * <li>(in)widget |
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109 * <li>(in)time |
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110 * <li>(in)x |
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111 * <li>(in)y |
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112 * <li>(in)dataTypes |
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113 * <li>(in,out)currentDataType |
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114 * <li>(in)operations |
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115 * <li>(in,out)detail |
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116 * <li>(in,out)feedback |
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117 * </ul></p> |
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118 * |
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119 * <p>The <code>operation</code> value is determined by the modifier keys pressed by the user. |
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120 * If no keys are pressed the <code>event.detail</code> field is set to DND.DROP_DEFAULT. |
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121 * If the application does not set the <code>event.detail</code> to something other than |
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122 * <code>DND.DROP_DEFAULT</code> the operation will be set to the platform defined standard default.</p> |
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123 * |
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124 * <p>The <code>currentDataType</code> value is determined by the value assigned to |
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125 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p> |
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126 * |
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127 * <p>The application can change the operation that will be performed by modifying the |
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128 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code> |
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129 * field.</p> |
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130 * |
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131 * <p>The application can also change the type of data being requested by modifying |
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132 * the <code>currentDataTypes</code> field but the value must be one of the values in the |
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133 * <code>dataTypes</code> list.</p> |
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134 * |
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135 * @param event the information associated with the drag operation changed event |
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136 * |
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137 * @see DropTargetEvent |
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138 */ |
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139 public void dragOperationChanged(DropTargetEvent event); |
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140 |
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141 /** |
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142 * The cursor is moving over the drop target. |
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143 * |
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144 * <p>The following fields in the DropTargetEvent apply: |
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145 * <ul> |
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146 * <li>(in)widget |
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147 * <li>(in)time |
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148 * <li>(in)x |
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149 * <li>(in)y |
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150 * <li>(in)dataTypes |
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151 * <li>(in,out)currentDataType |
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152 * <li>(in)operations |
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153 * <li>(in,out)detail |
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154 * <li>(in,out)feedback |
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155 * </ul></p> |
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156 * |
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157 * <p>The <code>operation</code> value is determined by the value assigned to |
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158 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p> |
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159 * |
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160 * <p>The <code>currentDataType</code> value is determined by the value assigned to |
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161 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p> |
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162 * |
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163 * <p>The application can change the operation that will be performed by modifying the |
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164 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code> |
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165 * field.</p> |
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166 * |
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167 * <p>The application can also change the type of data being requested by modifying the |
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168 * <code>currentDataTypes</code> field but the value must be one of the values in the |
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169 * <code>dataTypes</code> list.</p> |
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170 * |
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171 * <p>NOTE: At this point the <code>data</code> field is null. On some platforms, it is possible |
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172 * to obtain the data being transferred before the transfer occurs but in most platforms this is |
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173 * not possible. On those platforms where the data is available, the application can access the |
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174 * data as follows:</p> |
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175 * |
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176 * <pre><code> |
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177 * public void dragOver(DropTargetEvent event) { |
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178 * TextTransfer textTransfer = TextTransfer.getInstance(); |
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179 * String data = (String)textTransfer.nativeToJava(event.currentDataType); |
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180 * if (data !is null) { |
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181 * System.out.println("Data to be dropped is (Text)"+data); |
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182 * } |
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183 * }; |
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184 * </code></pre> |
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185 * |
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186 * @param event the information associated with the drag over event |
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187 * |
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188 * @see DropTargetEvent |
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189 */ |
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190 public void dragOver(DropTargetEvent event); |
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191 |
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192 /** |
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193 * The data is being dropped. The data field contains java format of the data being dropped. |
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194 * To determine the type of the data object, refer to the documentation for the Transfer subclass |
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195 * specified in event.currentDataType. |
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196 * |
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197 * <p>The following fields in DropTargetEvent apply: |
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198 * <ul> |
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199 * <li>(in)widget |
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200 * <li>(in)time |
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201 * <li>(in)x |
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202 * <li>(in)y |
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203 * <li>(in,out)detail |
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204 * <li>(in)currentDataType |
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205 * <li>(in)data |
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206 * </ul></p> |
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207 * |
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208 * <p>The application can refuse to perform the drop operation by setting the detail |
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209 * field to DND.DROP_NONE.</p> |
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210 * |
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211 * @param event the information associated with the drop event |
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212 * |
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213 * @see DropTargetEvent |
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214 */ |
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215 public void drop(DropTargetEvent event); |
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216 |
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217 /** |
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218 * The drop is about to be performed. |
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219 * The drop target is given a last chance to change the nature of the drop. |
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220 * |
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221 * <p>The following fields in the DropTargetEvent apply: |
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222 * <ul> |
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223 * <li>(in)widget |
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224 * <li>(in)time |
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225 * <li>(in)x |
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226 * <li>(in)y |
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227 * <li>(in)dataTypes |
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228 * <li>(in,out)currentDataType |
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229 * <li>(in)operations |
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230 * <li>(in,out)detail |
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231 * </ul></p> |
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232 * |
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233 * <p>The application can veto the drop by setting the <code>event.detail</code> field to |
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234 * <code>DND.DROP_NONE</code>.</p> |
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235 * |
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236 * <p>The application can change the operation that will be performed by modifying the |
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237 * <code>detail</code> field but the choice must be one of the values in the |
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238 * <code>operations</code> field.</p> |
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239 * |
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240 * <p>The application can also change the type of data being requested by modifying the |
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241 * <code>currentDataTypes</code> field but the value must be one of the values in the < |
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242 * code>dataTypes</code> list.</p> |
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243 * |
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244 * @param event the information associated with the drop accept event |
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245 * |
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246 * @see DropTargetEvent |
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247 */ |
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248 public void dropAccept(DropTargetEvent event); |
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249 |
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250 } |