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TreeView_Expand (Windows Embedded CE 6.0)

  • Статья

1/6/2010

This macro expands or collapses the list of child items, if any, associated with the specified parent item. You can use this macro or send the TVM_EXPAND message explicitly.

Syntax

BOOL TreeView_Expand( 
    hwnd, 
    hitem, 
    flag 
);

Parameters

  • hwnd
    Handle to a tree view control.
  • hitem
    Handle to the parent item that will be expanded or collapsed.

  • flag
    Action flag. For a list of possible values, see the description of the flag parameter in TVM_EXPAND.

    Value Description

    TVE_EXPANDPARTIAL

    Child items are visible and parent item's plus symbol is displayed. This flag must be used in combination with the TVE_EXPAND flag.

Return Value

Nonzero indicates that a change took place. Zero indicates otherwise.

Remarks

The TreeView_Expand macro causes the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED messages to be generated if the item being expanded does not have the TVIS_EXPANDEDONCE state bit set. This state gets set when a parent item is expanded for the first time. Using TVE_COLLAPSE and TVE_COLLAPSERESET with TreeView_Expand will cause the TVIS_EXPANDEDONCE state to be reset.

If the item already has the TVIS_EXPANDEDONCE state set, the TreeView_Expand macro does not cause the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED messages to be generated.

Requirements

Header commctrl.h
Windows Embedded CE Windows CE 1.0 and later

See Also

Reference

Tree View Controls Macros
TVM_EXPAND
TVN_ITEMEXPANDED
TVN_ITEMEXPANDING