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A FrameComposite delegates requests for handles, connectors, and for setting the display box to its frame figure. A RootRectangleFigure targets the handles and the connector to its FrameComposite. It also calls the willChange() and changed() methods of its FrameComposite before and (resp.) after setting its display box. A RootFigure can set a minimum size for the frame.
Due to the absence of multiple inheritance in Java, concrete root figures need to duplicate the code for managing the owning frame.
public abstract void displayBox(Point origin, Point corner)
public abstract Dimension getMinimumSize()
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