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7.

The drag and drop displayables make it possible to implement these and other uses of drag and drop. There are two classes involved here. The Drag class represents either something that can be dragged around the screen, something that can have a draggable dropped onto it, or something that can do both. The DragGroup class represents a group of Drags - for a drag and drop to occur, both Drags must be part of the same drag group.