/*! * Ext JS Library 3.0.3 * Copyright(c) 2006-2009 Ext JS, LLC * licensing@extjs.com * http://www.extjs.com/license */ /** * @class Ext.dd.DropZone * @extends Ext.dd.DropTarget *This class provides a container DD instance that allows dropping on multiple child target nodes.
*By default, this class requires that child nodes accepting drop are registered with {@link Ext.dd.Registry}. * However a simpler way to allow a DropZone to manage any number of target elements is to configure the * DropZone with an implementation of {@link #getTargetFromEvent} which interrogates the passed * mouse event to see if it has taken place within an element, or class of elements. This is easily done * by using the event's {@link Ext.EventObject#getTarget getTarget} method to identify a node based on a * {@link Ext.DomQuery} selector.
*Once the DropZone has detected through calling getTargetFromEvent, that the mouse is over * a drop target, that target is passed as the first parameter to {@link #onNodeEnter}, {@link #onNodeOver}, * {@link #onNodeOut}, {@link #onNodeDrop}. You may configure the instance of DropZone with implementations * of these methods to provide application-specific behaviour for these events to update both * application state, and UI state.
*For example to make a GridPanel a cooperating target with the example illustrated in * {@link Ext.dd.DragZone DragZone}, the following technique might be used:
* See the {@link Ext.dd.DragZone DragZone} documentation for details about building a DragZone which * cooperates with this DropZone. * @constructor * @param {Mixed} el The container element * @param {Object} config */ Ext.dd.DropZone = function(el, config){ Ext.dd.DropZone.superclass.constructor.call(this, el, config); }; Ext.extend(Ext.dd.DropZone, Ext.dd.DropTarget, { /** * Returns a custom data object associated with the DOM node that is the target of the event. By default * this looks up the event target in the {@link Ext.dd.Registry}, although you can override this method to * provide your own custom lookup. * @param {Event} e The event * @return {Object} data The custom data */ getTargetFromEvent : function(e){ return Ext.dd.Registry.getTargetFromEvent(e); }, /** * Called when the DropZone determines that a {@link Ext.dd.DragSource} has entered a drop node * that has either been registered or detected by a configured implementation of {@link #getTargetFromEvent}. * This method has no default implementation and should be overridden to provide * node-specific processing if necessary. * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from * {@link #getTargetFromEvent} for this node) * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source */ onNodeEnter : function(n, dd, e, data){ }, /** * Called while the DropZone determines that a {@link Ext.dd.DragSource} is over a drop node * that has either been registered or detected by a configured implementation of {@link #getTargetFromEvent}. * The default implementation returns this.dropNotAllowed, so it should be * overridden to provide the proper feedback. * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from * {@link #getTargetFromEvent} for this node) * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {String} status The CSS class that communicates the drop status back to the source so that the * underlying {@link Ext.dd.StatusProxy} can be updated */ onNodeOver : function(n, dd, e, data){ return this.dropAllowed; }, /** * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dragged out of * the drop node without dropping. This method has no default implementation and should be overridden to provide * node-specific processing if necessary. * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from * {@link #getTargetFromEvent} for this node) * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source */ onNodeOut : function(n, dd, e, data){ }, /** * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dropped onto * the drop node. The default implementation returns false, so it should be overridden to provide the * appropriate processing of the drop event and return true so that the drag source's repair action does not run. * @param {Object} nodeData The custom data associated with the drop node (this is the same value returned from * {@link #getTargetFromEvent} for this node) * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {Boolean} True if the drop was valid, else false */ onNodeDrop : function(n, dd, e, data){ return false; }, /** * Called while the DropZone determines that a {@link Ext.dd.DragSource} is being dragged over it, * but not over any of its registered drop nodes. The default implementation returns this.dropNotAllowed, so * it should be overridden to provide the proper feedback if necessary. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {String} status The CSS class that communicates the drop status back to the source so that the * underlying {@link Ext.dd.StatusProxy} can be updated */ onContainerOver : function(dd, e, data){ return this.dropNotAllowed; }, /** * Called when the DropZone determines that a {@link Ext.dd.DragSource} has been dropped on it, * but not on any of its registered drop nodes. The default implementation returns false, so it should be * overridden to provide the appropriate processing of the drop event if you need the drop zone itself to * be able to accept drops. It should return true when valid so that the drag source's repair action does not run. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {Boolean} True if the drop was valid, else false */ onContainerDrop : function(dd, e, data){ return false; }, /** * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the source is now over * the zone. The default implementation returns this.dropNotAllowed and expects that only registered drop * nodes can process drag drop operations, so if you need the drop zone itself to be able to process drops * you should override this method and provide a custom implementation. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {String} status The CSS class that communicates the drop status back to the source so that the * underlying {@link Ext.dd.StatusProxy} can be updated */ notifyEnter : function(dd, e, data){ return this.dropNotAllowed; }, /** * The function a {@link Ext.dd.DragSource} calls continuously while it is being dragged over the drop zone. * This method will be called on every mouse movement while the drag source is over the drop zone. * It will call {@link #onNodeOver} while the drag source is over a registered node, and will also automatically * delegate to the appropriate node-specific methods as necessary when the drag source enters and exits * registered nodes ({@link #onNodeEnter}, {@link #onNodeOut}). If the drag source is not currently over a * registered node, it will call {@link #onContainerOver}. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {String} status The CSS class that communicates the drop status back to the source so that the * underlying {@link Ext.dd.StatusProxy} can be updated */ notifyOver : function(dd, e, data){ var n = this.getTargetFromEvent(e); if(!n){ // not over valid drop target if(this.lastOverNode){ this.onNodeOut(this.lastOverNode, dd, e, data); this.lastOverNode = null; } return this.onContainerOver(dd, e, data); } if(this.lastOverNode != n){ if(this.lastOverNode){ this.onNodeOut(this.lastOverNode, dd, e, data); } this.onNodeEnter(n, dd, e, data); this.lastOverNode = n; } return this.onNodeOver(n, dd, e, data); }, /** * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the source has been dragged * out of the zone without dropping. If the drag source is currently over a registered node, the notification * will be delegated to {@link #onNodeOut} for node-specific handling, otherwise it will be ignored. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop target * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag zone */ notifyOut : function(dd, e, data){ if(this.lastOverNode){ this.onNodeOut(this.lastOverNode, dd, e, data); this.lastOverNode = null; } }, /** * The function a {@link Ext.dd.DragSource} calls once to notify this drop zone that the dragged item has * been dropped on it. The drag zone will look up the target node based on the event passed in, and if there * is a node registered for that event, it will delegate to {@link #onNodeDrop} for node-specific handling, * otherwise it will call {@link #onContainerDrop}. * @param {Ext.dd.DragSource} source The drag source that was dragged over this drop zone * @param {Event} e The event * @param {Object} data An object containing arbitrary data supplied by the drag source * @return {Boolean} True if the drop was valid, else false */ notifyDrop : function(dd, e, data){ if(this.lastOverNode){ this.onNodeOut(this.lastOverNode, dd, e, data); this.lastOverNode = null; } var n = this.getTargetFromEvent(e); return n ? this.onNodeDrop(n, dd, e, data) : this.onContainerDrop(dd, e, data); }, // private triggerCacheRefresh : function(){ Ext.dd.DDM.refreshCache(this.groups); } });myGridPanel.on('render', function() { myGridPanel.dropZone = new Ext.dd.DropZone(myGridPanel.getView().scroller, { // If the mouse is over a grid row, return that node. This is // provided as the "target" parameter in all "onNodeXXXX" node event handling functions getTargetFromEvent: function(e) { return e.getTarget(myGridPanel.getView().rowSelector); }, // On entry into a target node, highlight that node. onNodeEnter : function(target, dd, e, data){ Ext.fly(target).addClass('my-row-highlight-class'); }, // On exit from a target node, unhighlight that node. onNodeOut : function(target, dd, e, data){ Ext.fly(target).removeClass('my-row-highlight-class'); }, // While over a target node, return the default drop allowed class which // places a "tick" icon into the drag proxy. onNodeOver : function(target, dd, e, data){ return Ext.dd.DropZone.prototype.dropAllowed; }, // On node drop we can interrogate the target to find the underlying // application object that is the real target of the dragged data. // In this case, it is a Record in the GridPanel's Store. // We can use the data set up by the DragZone's getDragData method to read // any data we decided to attach in the DragZone's getDragData method. onNodeDrop : function(target, dd, e, data){ var rowIndex = myGridPanel.getView().findRowIndex(target); var r = myGridPanel.getStore().getAt(rowIndex); Ext.Msg.alert('Drop gesture', 'Dropped Record id ' + data.draggedRecord.id + ' on Record id ' + r.id); return true; } }); }