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Graphics Interchange Format  |  1997-10-25  |  56KB  |  452x291  |  4-bit (16 colors)

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OCR: UndoStack.Do (cmd) UndoStack commands[top) = cmd cmd. Do () Client commands[] Do (cmd) o- Do (cmd)o - Undo () Command Undo() Redo () basicState Redo() CanUndo () (LIFO) SetState (state) CanRedo () Do (0 Undo () "Redo () Target State This.Do () Command() o- SpecificCommand specificState SetState (state) chid = create SpecificCommand. Do () cmd SetState (state) Undo () Client Do (omd) Figure 5: Structure of the Undo/Redo Stack Pattern.

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