/**
 * @class Ext.tree.TreeDragZone
 * @extends Ext.dd.DragZone
 * @constructor
 * @param {String/HTMLElement/Element} tree The {@link Ext.tree.TreePanel} for which to enable dragging
 * @param {Object} config
 */

if(Ext.dd.DragZone){
Ext.tree.TreeDragZone = function(tree, config){
   
Ext.tree.TreeDragZone.superclass.constructor.call(this, tree.innerCt, config);
   
/**
    * The TreePanel for this drag zone
    * @type Ext.tree.TreePanel
    * @property
    */

   
this.tree = tree;
};

Ext.extend(Ext.tree.TreeDragZone, Ext.dd.DragZone, {
   
/**
     * @cfg {String} ddGroup
     * A named drag drop group to which this object belongs.  If a group is specified, then this object will only
     * interact with other drag drop objects in the same group (defaults to 'TreeDD').
     */

    ddGroup
: "TreeDD",

   
// private
    onBeforeDrag
: function(data, e){
       
var n = data.node;
       
return n && n.draggable && !n.disabled;
   
},

   
// private
    onInitDrag
: function(e){
       
var data = this.dragData;
       
this.tree.getSelectionModel().select(data.node);
       
this.tree.eventModel.disable();
       
this.proxy.update("");
        data
.node.ui.appendDDGhost(this.proxy.ghost.dom);
       
this.tree.fireEvent("startdrag", this.tree, data.node, e);
   
},

   
// private
    getRepairXY
: function(e, data){
       
return data.node.ui.getDDRepairXY();
   
},

   
// private
    onEndDrag
: function(data, e){
       
this.tree.eventModel.enable.defer(100, this.tree.eventModel);
       
this.tree.fireEvent("enddrag", this.tree, data.node, e);
   
},

   
// private
    onValidDrop
: function(dd, e, id){
       
this.tree.fireEvent("dragdrop", this.tree, this.dragData.node, dd, e);
       
this.hideProxy();
   
},

   
// private
    beforeInvalidDrop
: function(e, id){
       
// this scrolls the original position back into view
       
var sm = this.tree.getSelectionModel();
        sm
.clearSelections();
        sm
.select(this.dragData.node);
   
},
   
   
// private
    afterRepair
: function(){
       
if (Ext.enableFx && this.tree.hlDrop) {
           
Ext.Element.fly(this.dragData.ddel).highlight(this.hlColor || "c3daf9");
       
}
       
this.dragging = false;
   
}
});
}