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Programming With the Mac OS 8.5 Window Manager
Sets the highlight state of the window's structure region to reflect the window's validity as a drag-and-drop destination.
pascal OSStatus HiliteWindowFrameForDrag (
Applications typically call the Drag Manager functions ShowDragHilite and HideDragHilite to indicate that a window is a valid drag-and-drop destination. If your application does not do this--that is, if your application implements any type of custom drag highlighting, such as highlighting more than one area of a window at a time--it must call the HiliteWindowFrameForDrag function.
The HiliteWindowFrameForDrag function highlights a window's proxy icon when the user drags content inside the window that is a valid content type for that destination. The default behavior of system-defined windows is to highlight the proxy icon along with the window's content area when the window is a valid drag-and-drop destination. If you call the Drag Manager functions ShowDragHilite and HideDragHilite , you don't need to use HiliteWindowFrameForDrag .
See Supporting Window Proxy Icons for examples of how your application can provide proxy icon support in its document windows.