Canvas selection
The canvas selection (MCanvasSelection) is an abstract base class for an address-space-independent specification of a subset of the canvas graphics in the canvas representation. Many MCanvasSelection functions have default implementations based on the abstract interface of MCanvasRepresentation. You need override only a few MCanvasSelection functions to bind the selection to a specific concrete representation class. For convenience, GrafEdit has one concrete selection class that is based on a model-based representation class.
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