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I don't know how familiar you are with design patterns but have a look at the memento pattern. I agree that it's not easy to implement undo/redo but it will get even more difficult later on in the development process .

Memento pattern - Wikipedia, the free encyclopedia
Memento pattern in Java : Memento PatternDesign PatternJava
Add an undo/redo function to your Java apps with Swing - JavaWorld

Try google code, I can only recommend it since it is clean, fast and you have everything you need for a small open source project (SVN repository, Bug Tracker, Wiki).

<blockquote data-quote="DieBagger" data-source="post: 514597" data-attributes="member: 56421">I don't know how familiar you are with design patterns but have a look at the memento pattern. I agree that it's not easy to implement undo/redo but it will get even more difficult later on in the development process <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" />.<a href="http://en.wikipedia.org/wiki/Memento_pattern" target="_blank">Memento pattern - Wikipedia, the free encyclopedia</a><a href="http://www.java2s.com/Code/Java/Design-Pattern/MementopatterninJava.htm" target="_blank">Memento pattern in Java : Memento PatternDesign PatternJava</a><a href="http://www.javaworld.com/javaworld/jw-06-1998/jw-06-undoredo.html" target="_blank">Add an undo/redo function to your Java apps with Swing - JavaWorld</a>Try google code, I can only recommend it since it is clean, fast and you have everything you need for a small open source project (SVN repository, Bug Tracker, Wiki). <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin&nbsp; &nbsp; :D" loading="lazy" data-shortname=":D" /></blockquote>

[QUOTE="DieBagger, post: 514597, member: 56421"] I don't know how familiar you are with design patterns but have a look at the [B]memento [/B] pattern. I agree that it's not easy to implement undo/redo but it will get even more difficult later on in the development process ;). [url=http://en.wikipedia.org/wiki/Memento_pattern]Memento pattern - Wikipedia, the free encyclopedia[/url] [url=http://www.java2s.com/Code/Java/Design-Pattern/MementopatterninJava.htm]Memento pattern in Java : Memento PatternDesign PatternJava[/url] [url=http://www.javaworld.com/javaworld/jw-06-1998/jw-06-undoredo.html]Add an undo/redo function to your Java apps with Swing - JavaWorld[/url] Try google code, I can only recommend it since it is clean, fast and you have everything you need for a small open source project (SVN repository, Bug Tracker, Wiki). :D [/QUOTE]