MFeedbacker provides a default implementation that assumes feedback is displayed in the view returned by GetFeedbackView. By deriving from MFeedbacker and overriding the three HandleXXX functions, clients can make the coordinate view different from the view in which feedback is actually drawn. Most of the time however, the feedback coordinate view is also the feedback display view. Because this situation is so common, the default implementation is included in the base class.
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