X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/src/dd/DropZone.js?ds=sidebyside diff --git a/src/dd/DropZone.js b/src/dd/DropZone.js new file mode 100644 index 00000000..8a831111 --- /dev/null +++ b/src/dd/DropZone.js @@ -0,0 +1,262 @@ +/*! + * Ext JS Library 3.0.0 + * 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:


+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;
+        }
+    });
+}
+
+ * 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); + } +}); \ No newline at end of file