The TVM_EXPAND message expands or collapses the list of child items, if any, associated with the specified parent item. You can send this message explicitly or by using the TreeView_Expand macro.
TVM_EXPAND wParam = (WPARAM) (UINT) flag; lParam = (LPARAM) (HTREEITEM) hitem;
Value |
Meaning |
TVE_COLLAPSE |
Collapses the list. |
TVE_COLLAPSERESET |
Collapses the list and removes the child items. Note that TVE_COLLAPSE must also be specified. |
TVE_EXPAND |
Expands the list. |
TVE_TOGGLE |
Collapses the list if it is currently expanded or expands it if it is currently collapsed. |
Returns TRUE if any change took place or FALSE otherwise.
This message does not send the TVN_ITEMEXPANDING and TVN_ITEMEXPANDED notification messages to the parent window.
TreeView_Expand, TVN_ITEMEXPANDED, TVN_ITEMEXPANDING
file: /Techref/os/win/api/win32/mess/src/msg20_18.htm, 2KB, , updated: 2000/4/7 11:20, local time: 2024/12/4 20:42,
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