3 <title>The source code</title>
4 <link href="../resources/prettify/prettify.css" type="text/css" rel="stylesheet" />
5 <script type="text/javascript" src="../resources/prettify/prettify.js"></script>
7 <body onload="prettyPrint();">
8 <pre class="prettyprint lang-js">/*!
10 * Copyright(c) 2006-2009 Ext JS, LLC
12 * http://www.extjs.com/license
14 <div id="cls-Ext.dd.DragZone"></div>/**
\r
15 * @class Ext.dd.DragZone
\r
16 * @extends Ext.dd.DragSource
\r
17 * <p>This class provides a container DD instance that allows dragging of multiple child source nodes.</p>
\r
18 * <p>This class does not move the drag target nodes, but a proxy element which may contain
\r
19 * any DOM structure you wish. The DOM element to show in the proxy is provided by either a
\r
20 * provided implementation of {@link #getDragData}, or by registered draggables registered with {@link Ext.dd.Registry}</p>
\r
21 * <p>If you wish to provide draggability for an arbitrary number of DOM nodes, each of which represent some
\r
22 * application object (For example nodes in a {@link Ext.DataView DataView}) then use of this class
\r
23 * is the most efficient way to "activate" those nodes.</p>
\r
24 * <p>By default, this class requires that draggable child nodes are registered with {@link Ext.dd.Registry}.
\r
25 * However a simpler way to allow a DragZone to manage any number of draggable elements is to configure
\r
26 * the DragZone with an implementation of the {@link #getDragData} method which interrogates the passed
\r
27 * mouse event to see if it has taken place within an element, or class of elements. This is easily done
\r
28 * by using the event's {@link Ext.EventObject#getTarget getTarget} method to identify a node based on a
\r
29 * {@link Ext.DomQuery} selector. For example, to make the nodes of a DataView draggable, use the following
\r
30 * technique. Knowledge of the use of the DataView is required:</p><pre><code>
\r
31 myDataView.on('render', function() {
\r
32 myDataView.dragZone = new Ext.dd.DragZone(myDataView.getEl(), {
\r
34 // On receipt of a mousedown event, see if it is within a DataView node.
\r
35 // Return a drag data object if so.
\r
36 getDragData: function(e) {
\r
38 // Use the DataView's own itemSelector (a mandatory property) to
\r
39 // test if the mousedown is within one of the DataView's nodes.
\r
40 var sourceEl = e.getTarget(myDataView.itemSelector, 10);
\r
42 // If the mousedown is within a DataView node, clone the node to produce
\r
43 // a ddel element for use by the drag proxy. Also add application data
\r
44 // to the returned data object.
\r
46 d = sourceEl.cloneNode(true);
\r
51 repairXY: Ext.fly(sourceEl).getXY(),
\r
52 sourceStore: myDataView.store,
\r
53 draggedRecord: v.getRecord(sourceEl)
\r
58 // Provide coordinates for the proxy to slide back to on failed drag.
\r
59 // This is the original XY coordinates of the draggable element captured
\r
60 // in the getDragData method.
\r
61 getRepairXY: function() {
\r
62 return this.dragData.repairXY;
\r
66 * See the {@link Ext.dd.DropZone DropZone} documentation for details about building a DropZone which
\r
67 * cooperates with this DragZone.
\r
69 * @param {Mixed} el The container element
\r
70 * @param {Object} config
\r
72 Ext.dd.DragZone = function(el, config){
\r
73 Ext.dd.DragZone.superclass.constructor.call(this, el, config);
\r
74 if(this.containerScroll){
\r
75 Ext.dd.ScrollManager.register(this.el);
\r
79 Ext.extend(Ext.dd.DragZone, Ext.dd.DragSource, {
\r
80 <div id="prop-Ext.dd.DragZone-dragData"></div>/**
\r
81 * This property contains the data representing the dragged object. This data is set up by the implementation
\r
82 * of the {@link #getDragData} method. It must contain a <tt>ddel</tt> property, but can contain
\r
83 * any other data according to the application's needs.
\r
85 * @property dragData
\r
87 <div id="cfg-Ext.dd.DragZone-containerScroll"></div>/**
\r
88 * @cfg {Boolean} containerScroll True to register this container with the Scrollmanager
\r
89 * for auto scrolling during drag operations.
\r
91 <div id="cfg-Ext.dd.DragZone-hlColor"></div>/**
\r
92 * @cfg {String} hlColor The color to use when visually highlighting the drag source in the afterRepair
\r
93 * method after a failed drop (defaults to "c3daf9" - light blue)
\r
96 <div id="method-Ext.dd.DragZone-getDragData"></div>/**
\r
97 * Called when a mousedown occurs in this container. Looks in {@link Ext.dd.Registry}
\r
98 * for a valid target to drag based on the mouse down. Override this method
\r
99 * to provide your own lookup logic (e.g. finding a child by class name). Make sure your returned
\r
100 * object has a "ddel" attribute (with an HTML Element) for other functions to work.
\r
101 * @param {EventObject} e The mouse down event
\r
102 * @return {Object} The dragData
\r
104 getDragData : function(e){
\r
105 return Ext.dd.Registry.getHandleFromEvent(e);
\r
108 <div id="method-Ext.dd.DragZone-onInitDrag"></div>/**
\r
109 * Called once drag threshold has been reached to initialize the proxy element. By default, it clones the
\r
110 * this.dragData.ddel
\r
111 * @param {Number} x The x position of the click on the dragged object
\r
112 * @param {Number} y The y position of the click on the dragged object
\r
113 * @return {Boolean} true to continue the drag, false to cancel
\r
115 onInitDrag : function(x, y){
\r
116 this.proxy.update(this.dragData.ddel.cloneNode(true));
\r
117 this.onStartDrag(x, y);
\r
121 <div id="method-Ext.dd.DragZone-afterRepair"></div>/**
\r
122 * Called after a repair of an invalid drop. By default, highlights this.dragData.ddel
\r
124 afterRepair : function(){
\r
126 Ext.Element.fly(this.dragData.ddel).highlight(this.hlColor || "c3daf9");
\r
128 this.dragging = false;
\r
131 <div id="method-Ext.dd.DragZone-getRepairXY"></div>/**
\r
132 * Called before a repair of an invalid drop to get the XY to animate to. By default returns
\r
133 * the XY of this.dragData.ddel
\r
134 * @param {EventObject} e The mouse up event
\r
135 * @return {Array} The xy location (e.g. [100, 200])
\r
137 getRepairXY : function(e){
\r
138 return Ext.Element.fly(this.dragData.ddel).getXY();
\r