3 <title>The source code</title>
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8 <pre class="prettyprint lang-js"><div id="cls-Ext.dd.DropZone"></div>/**
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9 * @class Ext.dd.DropZone
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10 * @extends Ext.dd.DropTarget
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11 * <p>This class provides a container DD instance that allows dropping on multiple child target nodes.</p>
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12 * <p>By default, this class requires that child nodes accepting drop are registered with {@link Ext.dd.Registry}.
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13 * However a simpler way to allow a DropZone to manage any number of target elements is to configure the
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14 * DropZone with an implementation of {@link #getTargetFromEvent} which interrogates the passed
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15 * mouse event to see if it has taken place within an element, or class of elements. This is easily done
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16 * by using the event's {@link Ext.EventObject#getTarget getTarget} method to identify a node based on a
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17 * {@link Ext.DomQuery} selector.</p>
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18 * <p>Once the DropZone has detected through calling getTargetFromEvent, that the mouse is over
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19 * a drop target, that target is passed as the first parameter to {@link #onNodeEnter}, {@link #onNodeOver},
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20 * {@link #onNodeOut}, {@link #onNodeDrop}. You may configure the instance of DropZone with implementations
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21 * of these methods to provide application-specific behaviour for these events to update both
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22 * application state, and UI state.</p>
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23 * <p>For example to make a GridPanel a cooperating target with the example illustrated in
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24 * {@link Ext.dd.DragZone DragZone}, the following technique might be used:</p><pre><code>
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25 myGridPanel.on('render', function() {
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26 myGridPanel.dropZone = new Ext.dd.DropZone(myGridPanel.getView().scroller, {
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28 // If the mouse is over a grid row, return that node. This is
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29 // provided as the "target" parameter in all "onNodeXXXX" node event handling functions
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30 getTargetFromEvent: function(e) {
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31 return e.getTarget(myGridPanel.getView().rowSelector);
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34 // On entry into a target node, highlight that node.
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35 onNodeEnter : function(target, dd, e, data){
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36 Ext.fly(target).addClass('my-row-highlight-class');
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39 // On exit from a target node, unhighlight that node.
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40 onNodeOut : function(target, dd, e, data){
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41 Ext.fly(target).removeClass('my-row-highlight-class');
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44 // While over a target node, return the default drop allowed class which
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45 // places a "tick" icon into the drag proxy.
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46 onNodeOver : function(target, dd, e, data){
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47 return Ext.dd.DropZone.prototype.dropAllowed;
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50 // On node drop we can interrogate the target to find the underlying
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51 // application object that is the real target of the dragged data.
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52 // In this case, it is a Record in the GridPanel's Store.
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53 // We can use the data set up by the DragZone's getDragData method to read
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54 // any data we decided to attach in the DragZone's getDragData method.
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55 onNodeDrop : function(target, dd, e, data){
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56 var rowIndex = myGridPanel.getView().findRowIndex(target);
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57 var r = myGridPanel.getStore().getAt(rowIndex);
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58 Ext.Msg.alert('Drop gesture', 'Dropped Record id ' + data.draggedRecord.id +
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59 ' on Record id ' + r.id);
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65 * See the {@link Ext.dd.DragZone DragZone} documentation for details about building a DragZone which
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66 * cooperates with this DropZone.
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68 * @param {Mixed} el The container element
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69 * @param {Object} config
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71 Ext.dd.DropZone = function(el, config){
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72 Ext.dd.DropZone.superclass.constructor.call(this, el, config);
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75 Ext.extend(Ext.dd.DropZone, Ext.dd.DropTarget, {
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76 <div id="method-Ext.dd.DropZone-getTargetFromEvent"></div>/**
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77 * Returns a custom data object associated with the DOM node that is the target of the event. By default
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78 * this looks up the event target in the {@link Ext.dd.Registry}, although you can override this method to
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79 * provide your own custom lookup.
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80 * @param {Event} e The event
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81 * @return {Object} data The custom data
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83 getTargetFromEvent : function(e){
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84 return Ext.dd.Registry.getTargetFromEvent(e);
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87 <div id="method-Ext.dd.DropZone-onNodeEnter"></div>/**
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88 * Called when the DropZone determines that a {@link Ext.dd.DragSource} has entered a drop node
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89 * that has either been registered or detected by a configured implementation of {@link #getTargetFromEvent}.
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90 * This method has no default implementation and should be overridden to provide
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91 * node-specific processing if necessary.
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92 * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from
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93 * {@link #getTargetFromEvent} for this node)
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94 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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95 * @param {Event} e The event
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96 * @param {Object} data An object containing arbitrary data supplied by the drag source
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98 onNodeEnter : function(n, dd, e, data){
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102 <div id="method-Ext.dd.DropZone-onNodeOver"></div>/**
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103 * Called while the DropZone determines that a {@link Ext.dd.DragSource} is over a drop node
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104 * that has either been registered or detected by a configured implementation of {@link #getTargetFromEvent}.
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105 * The default implementation returns this.dropNotAllowed, so it should be
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106 * overridden to provide the proper feedback.
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107 * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from
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108 * {@link #getTargetFromEvent} for this node)
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109 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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110 * @param {Event} e The event
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111 * @param {Object} data An object containing arbitrary data supplied by the drag source
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112 * @return {String} status The CSS class that communicates the drop status back to the source so that the
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113 * underlying {@link Ext.dd.StatusProxy} can be updated
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115 onNodeOver : function(n, dd, e, data){
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116 return this.dropAllowed;
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119 <div id="method-Ext.dd.DropZone-onNodeOut"></div>/**
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120 * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dragged out of
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121 * the drop node without dropping. This method has no default implementation and should be overridden to provide
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122 * node-specific processing if necessary.
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123 * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from
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124 * {@link #getTargetFromEvent} for this node)
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125 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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126 * @param {Event} e The event
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127 * @param {Object} data An object containing arbitrary data supplied by the drag source
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129 onNodeOut : function(n, dd, e, data){
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133 <div id="method-Ext.dd.DropZone-onNodeDrop"></div>/**
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134 * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dropped onto
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135 * the drop node. The default implementation returns false, so it should be overridden to provide the
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136 * appropriate processing of the drop event and return true so that the drag source's repair action does not run.
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137 * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from
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138 * {@link #getTargetFromEvent} for this node)
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139 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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140 * @param {Event} e The event
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141 * @param {Object} data An object containing arbitrary data supplied by the drag source
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142 * @return {Boolean} True if the drop was valid, else false
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144 onNodeDrop : function(n, dd, e, data){
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148 <div id="method-Ext.dd.DropZone-onContainerOver"></div>/**
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149 * Called while the DropZone determines that a {@link Ext.dd.DragSource} is being dragged over it,
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150 * but not over any of its registered drop nodes. The default implementation returns this.dropNotAllowed, so
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151 * it should be overridden to provide the proper feedback if necessary.
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152 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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153 * @param {Event} e The event
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154 * @param {Object} data An object containing arbitrary data supplied by the drag source
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155 * @return {String} status The CSS class that communicates the drop status back to the source so that the
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156 * underlying {@link Ext.dd.StatusProxy} can be updated
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158 onContainerOver : function(dd, e, data){
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159 return this.dropNotAllowed;
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162 <div id="method-Ext.dd.DropZone-onContainerDrop"></div>/**
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163 * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dropped on it,
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164 * but not on any of its registered drop nodes. The default implementation returns false, so it should be
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165 * overridden to provide the appropriate processing of the drop event if you need the drop zone itself to
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166 * be able to accept drops. It should return true when valid so that the drag source's repair action does not run.
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167 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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168 * @param {Event} e The event
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169 * @param {Object} data An object containing arbitrary data supplied by the drag source
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170 * @return {Boolean} True if the drop was valid, else false
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172 onContainerDrop : function(dd, e, data){
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176 <div id="method-Ext.dd.DropZone-notifyEnter"></div>/**
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177 * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the source is now over
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178 * the zone. The default implementation returns this.dropNotAllowed and expects that only registered drop
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179 * nodes can process drag drop operations, so if you need the drop zone itself to be able to process drops
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180 * you should override this method and provide a custom implementation.
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181 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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182 * @param {Event} e The event
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183 * @param {Object} data An object containing arbitrary data supplied by the drag source
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184 * @return {String} status The CSS class that communicates the drop status back to the source so that the
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185 * underlying {@link Ext.dd.StatusProxy} can be updated
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187 notifyEnter : function(dd, e, data){
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188 return this.dropNotAllowed;
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191 <div id="method-Ext.dd.DropZone-notifyOver"></div>/**
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192 * The function a {@link Ext.dd.DragSource} calls continuously while it is being dragged over the drop zone.
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193 * This method will be called on every mouse movement while the drag source is over the drop zone.
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194 * It will call {@link #onNodeOver} while the drag source is over a registered node, and will also automatically
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195 * delegate to the appropriate node-specific methods as necessary when the drag source enters and exits
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196 * registered nodes ({@link #onNodeEnter}, {@link #onNodeOut}). If the drag source is not currently over a
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197 * registered node, it will call {@link #onContainerOver}.
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198 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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199 * @param {Event} e The event
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200 * @param {Object} data An object containing arbitrary data supplied by the drag source
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201 * @return {String} status The CSS class that communicates the drop status back to the source so that the
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202 * underlying {@link Ext.dd.StatusProxy} can be updated
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204 notifyOver : function(dd, e, data){
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205 var n = this.getTargetFromEvent(e);
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206 if(!n){ // not over valid drop target
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207 if(this.lastOverNode){
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208 this.onNodeOut(this.lastOverNode, dd, e, data);
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209 this.lastOverNode = null;
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211 return this.onContainerOver(dd, e, data);
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213 if(this.lastOverNode != n){
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214 if(this.lastOverNode){
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215 this.onNodeOut(this.lastOverNode, dd, e, data);
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217 this.onNodeEnter(n, dd, e, data);
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218 this.lastOverNode = n;
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220 return this.onNodeOver(n, dd, e, data);
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223 <div id="method-Ext.dd.DropZone-notifyOut"></div>/**
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224 * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the source has been dragged
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225 * out of the zone without dropping. If the drag source is currently over a registered node, the notification
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226 * will be delegated to {@link #onNodeOut} for node-specific handling, otherwise it will be ignored.
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227 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop target
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228 * @param {Event} e The event
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229 * @param {Object} data An object containing arbitrary data supplied by the drag zone
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231 notifyOut : function(dd, e, data){
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232 if(this.lastOverNode){
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233 this.onNodeOut(this.lastOverNode, dd, e, data);
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234 this.lastOverNode = null;
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238 <div id="method-Ext.dd.DropZone-notifyDrop"></div>/**
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239 * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the dragged item has
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240 * been dropped on it. The drag zone will look up the target node based on the event passed in, and if there
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241 * is a node registered for that event, it will delegate to {@link #onNodeDrop} for node-specific handling,
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242 * otherwise it will call {@link #onContainerDrop}.
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243 * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone
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244 * @param {Event} e The event
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245 * @param {Object} data An object containing arbitrary data supplied by the drag source
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246 * @return {Boolean} True if the drop was valid, else false
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248 notifyDrop : function(dd, e, data){
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249 if(this.lastOverNode){
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250 this.onNodeOut(this.lastOverNode, dd, e, data);
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251 this.lastOverNode = null;
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253 var n = this.getTargetFromEvent(e);
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255 this.onNodeDrop(n, dd, e, data) :
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256 this.onContainerDrop(dd, e, data);
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260 triggerCacheRefresh : function(){
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261 Ext.dd.DDM.refreshCache(this.groups);
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