/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.dd.DragZone
 * @extends Ext.dd.DragSource This class provides a container DD instance that
 *          proxies for multiple child node sources.<br />
 *          By default, this class requires that draggable child nodes are
 *          registered with {@link Ext.dd.Registry}.
 * @constructor
 * @param {Mixed}
 *            el The container element
 * @param {Object}
 *            config
 */
Ext.dd.DragZone = function(el, config) {
	Ext.dd.DragZone.superclass.constructor.call(this, el, config);
	if (this.containerScroll) {
		Ext.dd.ScrollManager.register(this.el);
	}
};

Ext.extend(Ext.dd.DragZone, Ext.dd.DragSource, {
			/**
			 * @cfg {Boolean} containerScroll True to register this container
			 *      with the Scrollmanager for auto scrolling during drag
			 *      operations.
			 */
			/**
			 * @cfg {String} hlColor The color to use when visually highlighting
			 *      the drag source in the afterRepair method after a failed
			 *      drop (defaults to "c3daf9" - light blue)
			 */

			/**
			 * Called when a mousedown occurs in this container. Looks in
			 * {@link Ext.dd.Registry} for a valid target to drag based on the
			 * mouse down. Override this method to provide your own lookup logic
			 * (e.g. finding a child by class name). Make sure your returned
			 * object has a "ddel" attribute (with an HTML Element) for other
			 * functions to work.
			 * 
			 * @param {EventObject}
			 *            e The mouse down event
			 * @return {Object} The dragData
			 */
			getDragData : function(e) {
				return Ext.dd.Registry.getHandleFromEvent(e);
			},

			/**
			 * Called once drag threshold has been reached to initialize the
			 * proxy element. By default, it clones the this.dragData.ddel
			 * 
			 * @param {Number}
			 *            x The x position of the click on the dragged object
			 * @param {Number}
			 *            y The y position of the click on the dragged object
			 * @return {Boolean} true to continue the drag, false to cancel
			 */
			onInitDrag : function(x, y) {
				this.proxy.update(this.dragData.ddel.cloneNode(true));
				this.onStartDrag(x, y);
				return true;
			},

			/**
			 * Called after a repair of an invalid drop. By default, highlights
			 * this.dragData.ddel
			 */
			afterRepair : function() {
				if (Ext.enableFx) {
					Ext.Element.fly(this.dragData.ddel).highlight(this.hlColor
							|| "c3daf9");
				}
				this.dragging = false;
			},

			/**
			 * Called before a repair of an invalid drop to get the XY to
			 * animate to. By default returns the XY of this.dragData.ddel
			 * 
			 * @param {EventObject}
			 *            e The mouse up event
			 * @return {Array} The xy location (e.g. [100, 200])
			 */
			getRepairXY : function(e) {
				return Ext.Element.fly(this.dragData.ddel).getXY();
			}
		});