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Design Pattern for Undo Engine
In general, how do you deal with supporting an "undo" feature in your application? I have worked on web apps and desktop apps alike, and I have never really felt comfortable with any "undo" system I've made.
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There are two main software development patterns that are the obvious choices when dealing with operations like undo and redo: Memento and Command patterns.
Memento pattern is used to restore state of an object to a previous state. As your application is progressing, you may want to save checkpoints in your application and restore back to those checkpoints later. originator : the object for which the state is to be saved.
I believe it should be Command design pattern.
Here is article about multilevel Undo/Redo with Command pattern.
EDIT: Here is second about multilevel Undo/Redo with Memento pattern.
So probably it can be done with both.
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