Methods
Not documented.
Not documented.
Moves the drag image to a new position, which is determined from the passed point P and the previous mouse position.
Not documented.
Returns the current size and position of the drag image (screen coordinates).
Not documented.
Frequently called helper routine to actually do the blend and put it onto
Not documented.
Creates all necessary structures to do alpha blended dragging using the given image.
Notification by the drop target tree to update the background image because something in the tree has changed.
Shows the drag image after it has been hidden by HideDragImage.
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