flex drag&drop tree fold

View Code 
 1 ------------------- 
 2 private function onMyTreeDragOver(event : DragEvent) : void { 
 3 ..... skipped code.... 
 4 
 5          //forbid dragging on itself 
 6         if (draggedItem == hoverTarget) { 
 7             DragManager.showFeedback(DragManager.NONE); 
 8             myTree.hideDropFeedback(event); 
 9            return; 
10        } 
11 
12          // forbid dragging of top level of the hierarchy 
13         var hoverTargetParentXML : XML = 
14 myTree.getParentItem(hoverTarget); 
15 
16        if (hoverTargetParentXML == null) { 
17               DragManager.showFeedback(DragManager.NONE); 
18               myTree.hideDropFeedback(event); 
19              return; 
20        } 
21 ..... skipped code.... 
22 } 
23 -------------------
posted @ 2012-02-17 00:40  miai7  阅读(157)  评论(0)  编辑  收藏  举报