On Tue, Mar 15, 2011 at 3:06 PM, Mark Murphy <[email protected]>wrote:
> This is typically implemented via the memento pattern, where you keep a > list of the transactions that were applied to the image, where > each transaction knows how to roll itself back. An undo pops the > last transaction off the stack and has it roll back its work. > Also have a look at the Command Pattern, which I believe is often used in undo / redo operations in GUIs. ------------------------------------------------------------------------------------------------- TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
