    /**
     * @class Ext.view.DragZone
     * @extends Ext.dd.DragZone
     * @private
     */
    Ext.define('Ext.view.DragZone', {
        extend: 'Ext.dd.DragZone',
        containerScroll: false,

        constructor: function(config) {
            var me = this;

            Ext.apply(me, config);

            // Create a ddGroup unless one has been configured.
            // User configuration of ddGroups allows users to specify which
            // DD instances can interact with each other. Using one
            // based on the id of the View would isolate it and mean it can only
            // interact with a DropZone on the same View also using a generated ID.
            if (!me.ddGroup) {
                me.ddGroup = 'view-dd-zone-' + me.view.id;
            }

            // Ext.dd.DragDrop instances are keyed by the ID of their encapsulating element.
            // So a View's DragZone cannot use the View's main element because the DropZone must use that
            // because the DropZone may need to scroll on hover at a scrolling boundary, and it is the View's
            // main element which handles scrolling.
            // We use the View's parent element to drag from. Ideally, we would use the internal structure, but that
            // is transient; DataView's recreate the internal structure dynamically as data changes.
            // TODO: Ext 5.0 DragDrop must allow multiple DD objects to share the same element.
            me.callParent([me.view.el.dom.parentNode]);

            me.ddel = Ext.get(document.createElement('div'));
            me.ddel.addCls(Ext.baseCSSPrefix + 'grid-dd-wrap');
        },

        init: function(id, sGroup, config) {
            this.initTarget(id, sGroup, config);
            this.view.mon(this.view, {
                itemmousedown: this.onItemMouseDown,
                scope: this
            });
        },

        onItemMouseDown: function(view, record, item, index, e) {
            if (!this.isPreventDrag(e, record, item, index)) {
                this.handleMouseDown(e);

                // If we want to allow dragging of multi-selections, then veto the following handlers (which, in the absence of ctrlKey, would deselect)
                // if the mousedowned record is selected
                if (view.getSelectionModel().selectionMode == 'MULTI' && !e.ctrlKey && view.getSelectionModel().isSelected(record)) {
                    return false;
                }
            }
        },

        // private template method
        isPreventDrag: function(e) {
            return false;
        },

        getDragData: function(e) {
            var view = this.view,
                item = e.getTarget(view.getItemSelector()),
                record, selectionModel, records;

            if (item) {
                record = view.getRecord(item);
                selectionModel = view.getSelectionModel();
                records = selectionModel.getSelection();
                return {
                    copy: this.view.copy || (this.view.allowCopy && e.ctrlKey),
                    event: new Ext.EventObjectImpl(e),
                    view: view,
                    ddel: this.ddel,
                    item: item,
                    records: records,
                    fromPosition: Ext.fly(item).getXY()
                };
            }
        },

        onInitDrag: function(x, y) {
            var me = this,
                data = me.dragData,
                view = data.view,
                selectionModel = view.getSelectionModel(),
                record = view.getRecord(data.item),
                e = data.event;

            // Update the selection to match what would have been selected if the user had
            // done a full click on the target node rather than starting a drag from it
            if (!selectionModel.isSelected(record) || e.hasModifier()) {
                selectionModel.selectWithEvent(record, e, true);
            }
            data.records = selectionModel.getSelection();

            me.ddel.update(me.getDragText());
            me.proxy.update(me.ddel.dom);
            me.onStartDrag(x, y);
            return true;
        },

        getDragText: function() {
            var count = this.dragData.records.length;
            return Ext.String.format(this.dragText, count, count == 1 ? '' : 's');
        },

        getRepairXY : function(e, data){
            return data ? data.fromPosition : false;
        }
    });