Item Labels
You typically specify the text of an item's label when adding the item to the
tree-view control. The
TVM_INSERTITEM message includes a
TV_ITEM structure that defines the item's properties, including a string containing
the text of the label.
A tree-view control allocates memory for storing each item; the text of the
item labels takes up a significant portion of this memory. If your application
maintains a copy of the strings in the tree-view control, you can decrease the
memory requirements of the control by specifying the LPSTR_TEXTCALLBACK value in
the
pszText member of
TV_ITEM instead of passing actual strings to the tree view. Using LPSTR_TEXTCALLBACK
causes the tree-view control to retrieve the text of an item's label from the
parent window whenever the item needs to be redrawn. To retrieve the text, the
tree-view control sends a
TVN_GETDISPINFO notification message, which includes the address of a
TV_DISPINFO structure. The parent window must fill the appropriate members of the
included structure.
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