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DataPoint
- 当展开或者收起时会激发这个函数,其中结构指针pNMTreeView的action参数,就记录了是打开还是关闭,即 if(pNMTreeView-> action == 1) //设置收起的图标; else if(pNMTreeView-> action == 2) //设置展开后的图标; -When you expand or hide, can trigger this function, in which the action parameter structure pointe