Owner-Drawn Menus and the WM_MEASUREITEM Message
Before Windows displays an owner-drawn menu item for the first time, it sends
the
WM_MEASUREITEM message to the window procedure of the window that owns the item's menu. This
message contains a pointer to a
MEASUREITEMSTRUCT structure that identifies the item and contains the item data that an
application may have assigned to it. The window procedure must fill the
itemWidth and
itemHeight members of the structure before returning from processing the message.
Windows uses the information in these members when creating the bounding rectangle in
which an application draws the menu item. It also uses the information to
detect when the user chooses the item.
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