Processing the WM_MEASUREITEM Message
An owner-drawn combo box sends the
WM_MEASUREITEM message to its parent window or dialog box procedure so the application can
set the dimensions of each list item. Because the example combo box has the
CBS_OWNERDRAWFIXED style, the system sends the WM_MEASUREITEM message only once.
Combo boxes with the CBS_OWNERDRAWVARIABLE style send a WM_MEASUREITEM message
for each list item.
The
lParam parameter points to a
MEASUREITEMSTRUCT structure that identifies the control and list item. It also contains the
default dimensions of the list item. The example in Creating a Square Meal Dialog
Box modifies the
itemHeight structure member to ensure that the list items are high enough to accommodate
the food-group bitmaps.
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