args | 拖放参数。 |
重载此函数可控制 TreeView 的拖放行为。
当拖放操作处于活动状态且光标悬停在 TreeView 上时,系统会持续调用此函数。请注意,拖放操作可能已在 TreeView 外部启动。
使用 DragAndDrop 中的状态确定拖放对象。此函数返回可控制光标状态的 DragAndDropVisualMode 值。
按以下顺序控制 TreeView 拖放:
1) 重载 CanStartDrag 以拖动 TreeViewItem。
2) 重载 SetupDragAndDrop 以设置要拖动的 TreeViewItem。
3) 重载 HandleDragAndDrop 以控制 TreeView 的拖放行为。
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