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Graphics Interchange Format  |  1998-02-10  |  54.3 KB  |  452x291  |  4-bit (16 colors)
   ocr: UndoStackDo (cmd) UndoStack commandsltople cmd commandst cMa.DoN Client Do (cmd) o Command Do (cmd)o- Undo 0 Undo() Redol () pasicState Redo() CanUndo ( (LIFO) SetState (state) CanRedo() Do0 Undo() Pfedo() Target State TheDO0 Command() o-F- SpecificCommand specificState SetState (state) cmd E dreateSpecticCommand: Do0 cmd.Setstate (state) Undo0) ClentDo(omd): Figure 5: Strecture oftbe Sndo/Redo Stack Pattern.