我在做图形系统时，需要在编辑图形后进行undo,redo，这些是我参照的论文。感觉挺有帮助的。-I was doing the graphics system, you need to edit the graphic after undo, redo, these are my reference papers. Feeling Tingyou help.

选择年/月的控制,改变鼠标形状的例子1,2,Undo/Redo管理器,一个异常处理的例子 -Select Year/Month of control, change the mouse shape example 1,2, Undo/Redo manager, an exception handling example

用规范的软件设计模式实现了模拟Word的多步撤销和重复- Specification of software design patterns to achieve a multi-step simulation of Word Undo and Redo