MFC TreeView在收缩的时候，会从已选中的子节点切换到父节点的问题

Question

如果我此时点击头结点2前面的"-"按钮，那么收缩根节点的同时，会自动将选中项切换到"头节点2"这项，我想让他收缩的同时，不会对选中项产生影响，应该怎么做？

Answer 1

TreeView_Select


BOOL TreeView_Select(
    HWND hwndTV,
    HTREEITEM hitem,
    UINT flag
);        

Selects the specified tree view item, scrolls the item into view, or redraws the item in the style used to indicate the target of a drag-and-drop operation. You can use this macro or the TreeView_SelectItem, TreeView_SelectSetFirstVisible, or TreeView_SelectDropTarget macros, or you can send the TVM_SELECTITEM message explicitly. 

Returns TRUE if successful, or FALSE otherwise. 
hwndTV 
Handle to the tree view control. 
hitem 
Handle to an item. If the hitem parameter is NULL, the control is set to have no selected item. 
flag 
Action flag. This parameter can be one of the following values: TVGN_CARET  Sets the selection to the given item. The control's parent window receives the TVN_SELCHANGING and TVN_SELCHANGED notification messages. 
TVGN_DROPHILITE  Redraws the given item in the style used to indicate the target of a drag-and-drop operation. 
TVGN_FIRSTVISIBLE  Ensures that the specified item is visible, and, if possible, displays it at the top of the control's window. Tree view controls display as many items as will fit in the window. If the specified item is near the bottom of the control's hierarchy of items, it might not become the first visible item, depending on how many items fit in the window. 

If the specified item is the child of a collapsed parent item, the parent's list of child items is expanded to reveal the specified item. In this case, the parent window receives the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED notification messages. 



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