wangtao
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  <pre class="prettyprint lang-js"><span id='Ext-tree-ViewDragZone'>/**
</span> * @private
 */
Ext.define('Ext.tree.ViewDragZone', {
    extend: 'Ext.view.DragZone',

    isPreventDrag: function(e, record) {
        return (record.get('allowDrag') === false) || !!e.getTarget(this.view.expanderSelector);
    },
    
    afterRepair: function() {
        var me = this,
            view = me.view,
            selectedRowCls = view.selectedItemCls,
            records = me.dragData.records,
            r,
            rLen    = records.length,
            fly = Ext.fly,
            item;
        
        if (Ext.enableFx &amp;&amp; me.repairHighlight) {
            // Roll through all records and highlight all the ones we attempted to drag.
            for (r = 0; r &lt; rLen; r++) {
                // anonymous fns below, don't hoist up unless below is wrapped in
                // a self-executing function passing in item.
                item = view.getNode(records[r]);

                // We must remove the selected row class before animating, because
                // the selected row class declares !important on its background-color.
                fly(item.firstChild).highlight(me.repairHighlightColor, {
                    listeners: {
                        beforeanimate: function() {
                            if (view.isSelected(item)) {
                                fly(item).removeCls(selectedRowCls);
                            }
                        },
                        afteranimate: function() {
                            if (view.isSelected(item)) {
                                fly(item).addCls(selectedRowCls);
                            }
                        }
                    }
                });
            }

        }
        me.dragging = false;
    }
});</pre>
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