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TVM_SELECTITEM message

  • Artikkel

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 send this message explicitly or by using the TreeView_Select, TreeView_SelectItem, or TreeView_SelectDropTarget macro.

Parameters

wParam

Action flag. This parameter can be one of the following values:

Value Meaning
TVGN_CARET
 Sets the selection to the specified item. The tree-view control's parent window receives the TVN_SELCHANGING and TVN_SELCHANGED notification codes.
TVGN_DROPHILITE
 Redraws the specified 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.
TVSI_NOSINGLEEXPAND
 When a single item is selected, ensures that the treeview does not expand the children of that item. This is valid only if used with the TVGN_CARET flag.
Note: To use this flag, you must provide a manifest specifying Comclt32.dll version 6.0. For more information on manifests, see Enabling Visual Styles.

lParam

Handle to an item. If lParam is NULL, the control is set to have no selected item.

Return value

Returns TRUE if successful, or FALSE otherwise.

Remarks

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 control's parent window receives the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED notification codes.

Using the TreeView_SelectItem macro is equivalent to sending the TVM_SELECTITEM message with wParam set to the TVGN_CARET value. Using the TreeView_SelectDropTarget macro is equivalent to sending the TVM_SELECTITEM message with wParam set to the TVGN_DROPHILITE value. Using TreeView_SelectSetFirstVisible is equivalent to sending the TVM_SELECTITEM message with wParam set to the TVGN_FIRSTVISIBLE value.

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Commctrl.h