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annotate dwt/dnd/DropTargetListener.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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children 43123e716bda
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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.DropTargetListener;
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13 import dwt.dwthelper.utils;
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15 import dwt.internal.DWTEventListener;
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16
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17 /**
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18 * The <code>DropTargetListener</code> class provides event notification to the application
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19 * for DropTarget events.
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20 *
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21 * <p>As the user moves the cursor into, over and out of a Control that has been designated
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22 * as a DropTarget, events indicate what operation can be performed and what data can be
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23 * transferred if a drop where to occur at that point.
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24 * The application can respond to these events and change the type of data that will
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25 * be dropped by modifying event.currentDataType, or change the operation that will be performed
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26 * by modifying the event.detail field or stop any drop from happening on the current target
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27 * by setting the event.detail field to DND_DROP_NONE.</p>
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28 *
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29 * <p>When the user causes a drop to happen by releasing the mouse over a valid drop target,
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30 * the application has one last chance to change the data type of the drop through the
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31 * DropAccept event. If the drop is still allowed, the DropAccept event is immediately
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32 * followed by the Drop event. In the Drop event, the application can still change the
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33 * operation that is performed but the data type is fixed.</p>
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34 *
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35 * @see DropTargetEvent
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36 *
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37 */
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38 public interface DropTargetListener extends DWTEventListener {
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39
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40 /**
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41 * The cursor has entered the drop target boundaries.
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42 *
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43 * <p>The following fields in the DropTargetEvent apply:
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44 * <ul>
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45 * <li>(in)widget
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46 * <li>(in)time
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47 * <li>(in)x
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48 * <li>(in)y
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49 * <li>(in)dataTypes
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50 * <li>(in,out)currentDataType
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51 * <li>(in)operations
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52 * <li>(in,out)detail
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53 * <li>(in,out)feedback
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54 * </ul></p>
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55 *
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56 * <p>The <code>operation</code> value is determined by the modifier keys pressed by the user.
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57 * If no keys are pressed the <code>event.detail</code> field is set to DND.DROP_DEFAULT.
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58 * If the application does not set the <code>event.detail</code> to something other
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59 * than <code>DND.DROP_DEFAULT</code> the operation will be set to the platform defined standard
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60 * default.</p>
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61 *
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62 * <p>The <code>currentDataType</code> is determined by the first transfer agent specified in
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63 * setTransfer() that matches a data type provided by the drag source.</p>
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64 *
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65 * <p>It is possible to get a DragEnter event when the drag source does not provide any matching data.
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66 * In this case, the default operation is DND.DROP_NONE and the currentDataType is null.</p>
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67 *
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68 * <p>The application can change the operation that will be performed by modifying the
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69 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code>
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70 * field or DND.DROP_NONE.</p>
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71 *
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72 * <p>The application can also change the type of data being requested by
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73 * modifying the <code>currentDataTypes</code> field but the value must be one of the values
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74 * in the <code>dataTypes</code> list.</p>
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75 *
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76 * @param event the information associated with the drag enter event
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77 *
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78 * @see DropTargetEvent
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79 */
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80 public void dragEnter(DropTargetEvent event);
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81
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82 /**
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83 * The cursor has left the drop target boundaries OR the drop has been cancelled OR the data
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84 * is about to be dropped.
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85 *
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86 * <p>The following fields in the DropTargetEvent apply:
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87 * <ul>
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88 * <li>(in)widget
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89 * <li>(in)time
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90 * <li>(in)x
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91 * <li>(in)y
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92 * <li>(in)dataTypes
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93 * <li>(in)currentDataType
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94 * <li>(in)operations
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95 * <li>(in)detail
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96 * </ul></p>
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97 *
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98 * @param event the information associated with the drag leave event
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99 *
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100 * @see DropTargetEvent
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101 */
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102 public void dragLeave(DropTargetEvent event);
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103
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104 /**
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105 * The operation being performed has changed (usually due to the user changing the selected modifier key(s)
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106 * while dragging).
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107 *
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108 * <p>The following fields in the DropTargetEvent apply:
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109 * <ul>
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110 * <li>(in)widget
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111 * <li>(in)time
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112 * <li>(in)x
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113 * <li>(in)y
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114 * <li>(in)dataTypes
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115 * <li>(in,out)currentDataType
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116 * <li>(in)operations
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117 * <li>(in,out)detail
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118 * <li>(in,out)feedback
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119 * </ul></p>
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120 *
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121 * <p>The <code>operation</code> value is determined by the modifier keys pressed by the user.
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122 * If no keys are pressed the <code>event.detail</code> field is set to DND.DROP_DEFAULT.
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123 * If the application does not set the <code>event.detail</code> to something other than
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124 * <code>DND.DROP_DEFAULT</code> the operation will be set to the platform defined standard default.</p>
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125 *
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126 * <p>The <code>currentDataType</code> value is determined by the value assigned to
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127 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p>
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128 *
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129 * <p>The application can change the operation that will be performed by modifying the
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130 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code>
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131 * field.</p>
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132 *
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133 * <p>The application can also change the type of data being requested by modifying
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134 * the <code>currentDataTypes</code> field but the value must be one of the values in the
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135 * <code>dataTypes</code> list.</p>
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136 *
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137 * @param event the information associated with the drag operation changed event
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138 *
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139 * @see DropTargetEvent
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140 */
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141 public void dragOperationChanged(DropTargetEvent event);
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142
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143 /**
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144 * The cursor is moving over the drop target.
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145 *
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146 * <p>The following fields in the DropTargetEvent apply:
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147 * <ul>
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148 * <li>(in)widget
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149 * <li>(in)time
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150 * <li>(in)x
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151 * <li>(in)y
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152 * <li>(in)dataTypes
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153 * <li>(in,out)currentDataType
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154 * <li>(in)operations
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155 * <li>(in,out)detail
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156 * <li>(in,out)feedback
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157 * </ul></p>
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158 *
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159 * <p>The <code>operation</code> value is determined by the value assigned to
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160 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p>
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161 *
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162 * <p>The <code>currentDataType</code> value is determined by the value assigned to
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163 * <code>currentDataType</code> in previous dragEnter and dragOver calls.</p>
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164 *
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165 * <p>The application can change the operation that will be performed by modifying the
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166 * <code>detail</code> field but the choice must be one of the values in the <code>operations</code>
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167 * field.</p>
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168 *
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169 * <p>The application can also change the type of data being requested by modifying the
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170 * <code>currentDataTypes</code> field but the value must be one of the values in the
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171 * <code>dataTypes</code> list.</p>
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172 *
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173 * <p>NOTE: At this point the <code>data</code> field is null. On some platforms, it is possible
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174 * to obtain the data being transferred before the transfer occurs but in most platforms this is
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175 * not possible. On those platforms where the data is available, the application can access the
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176 * data as follows:</p>
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177 *
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178 * <pre><code>
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179 * public void dragOver(DropTargetEvent event) {
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180 * TextTransfer textTransfer = TextTransfer.getInstance();
45
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181 * String data = (String)textTransfer.nativeToJava(event.currentDataType);
0
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182 * if (data !is null) {
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183 * System.out.println("Data to be dropped is (Text)"+data);
0
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184 * }
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185 * };
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186 * </code></pre>
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187 *
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188 * @param event the information associated with the drag over event
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189 *
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190 * @see DropTargetEvent
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191 */
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192 public void dragOver(DropTargetEvent event);
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193
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194 /**
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195 * The data is being dropped. The data field contains java format of the data being dropped.
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196 * To determine the type of the data object, refer to the documentation for the Transfer subclass
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197 * specified in event.currentDataType.
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198 *
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199 * <p>The following fields in DropTargetEvent apply:
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200 * <ul>
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201 * <li>(in)widget
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202 * <li>(in)time
380af2bdd8e5 Upload of whole dwt tree
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parents:
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203 * <li>(in)x
380af2bdd8e5 Upload of whole dwt tree
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204 * <li>(in)y
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205 * <li>(in,out)detail
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206 * <li>(in)currentDataType
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207 * <li>(in)data
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208 * </ul></p>
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209 *
380af2bdd8e5 Upload of whole dwt tree
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210 * <p>The application can refuse to perform the drop operation by setting the detail
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211 * field to DND.DROP_NONE.</p>
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212 *
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213 * @param event the information associated with the drop event
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214 *
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215 * @see DropTargetEvent
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216 */
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217 public void drop(DropTargetEvent event);
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218
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219 /**
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220 * The drop is about to be performed.
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221 * The drop target is given a last chance to change the nature of the drop.
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222 *
380af2bdd8e5 Upload of whole dwt tree
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223 * <p>The following fields in the DropTargetEvent apply:
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224 * <ul>
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225 * <li>(in)widget
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226 * <li>(in)time
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227 * <li>(in)x
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228 * <li>(in)y
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229 * <li>(in)dataTypes
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230 * <li>(in,out)currentDataType
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231 * <li>(in)operations
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232 * <li>(in,out)detail
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233 * </ul></p>
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234 *
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235 * <p>The application can veto the drop by setting the <code>event.detail</code> field to
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236 * <code>DND.DROP_NONE</code>.</p>
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237 *
380af2bdd8e5 Upload of whole dwt tree
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238 * <p>The application can change the operation that will be performed by modifying the
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239 * <code>detail</code> field but the choice must be one of the values in the
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240 * <code>operations</code> field.</p>
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241 *
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242 * <p>The application can also change the type of data being requested by modifying the
380af2bdd8e5 Upload of whole dwt tree
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243 * <code>currentDataTypes</code> field but the value must be one of the values in the <
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244 * code>dataTypes</code> list.</p>
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245 *
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246 * @param event the information associated with the drop accept event
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247 *
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248 * @see DropTargetEvent
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249 */
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250 public void dropAccept(DropTargetEvent event);
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251
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252 }