Using the MNS_DRAGDROP style: Dragging out (The Old New Thing)
Windows 2000 introduced the `MNS_DRAGDROP` menu style, which permits
drag/drop operations in a menu. Nobody uses this style, probably because it’s
totally undiscoverable by the end-user. But I’ll write a sample program
anyway.
Mind you, I knew nothing about the `MNS_DRAGDROP` menu style until I started
writing this entry. But I simply read the documentation, which says that if
you set this style, you will receive `WM_MENUDRAG` and `WM_MENUGETOBJECT`
messages. The `WM_MENUDRAG` message is sent when the user drags a menu item,
so let’s go with that first. The documentation says that you get information
about the item that was dragged, and then you return a code that specifies
whether you want the menu to remain up or whether you want it torn down.
Simple enough. Let’s do it.
Start with the scratch program, add the function `GetUIObjectOfFile` and
the class `CDropSource`, and change the calls to `CoInitialize` and
`CoUninitialize` into `OleInitialize` and `OleUninitialize`, respectively.
Next, define the menu we’re going to play with:
// resource header file
#define IDM_MAIN 1
#define IDC_CLOCK 100
// resource file
IDM_MAIN …
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