Setting the Owner-Drawn Flag - Win32 Programmer's Reference

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Setting the Owner-Drawn Flag

You cannot define an owner-drawn menu item in your application's resource-definition file. Instead, you must create a new menu item or modify an existing one by using the MFT_OWNERDRAW menu flag.

You can use the InsertMenuItem or SetMenuItemInfo function to specify an owner-drawn menu item. Use InsertMenuItem to insert a new menu item at the specified position in a menu bar or menu. Use SetMenuItemInfo to change the contents of a menu.

When calling these two functions, you must specify the address of a MENUITEMINFO structure, giving the properties of the new menu item or the properties you want to change for an existing menu item. To make an item an owner-drawn item, specify the MIIM_TYPE value for the fMask member and the MFT_OWNERDRAW value for the fType member.

By setting the appropriate members of the MENUITEMINFO structure, you can associate an application-defined value, which is called item data, with each menu item. To do so, specify the MIIM_DATA value for the fMask member and the application-defined value for the dwItemData member.

You can use item data with any type of menu item, but it is particularly useful for owner-drawn items. For example, suppose a structure contains information used to draw a menu item. An application might use the item data for a menu item to store a pointer to the structure. The item data is sent to the menu's owner window with the WM_MEASUREITEM and WM_DRAWITEM messages. To retrieve the item data for a menu at any time, use the GetMenuItemInfo function.

Applications written for earlier versions of Windows can continue to call AppendMenu, InsertMenu, or ModifyMenu to assign the MF_OWNERDRAW flag to an owner-drawn menu item.

When you call any of these three functions, you can pass a 32-bit value as the lpNewItem parameter. This value can represent any information that is meaningful to your application, and that will be available to your application when the item is to be displayed. For example, the value could contain a pointer to a structure; the structure, in turn, might contain a text string and the handle of a logical font that your application will use to draw the string.

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