| 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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