I am currently working on the design of a blogging system (ala WordPress, Movable Type) as an exercise of my independent study. As part of the design, I would like to design and implement an application-wide cascading undo model such as the one described by Jan Vratislav (http://bit.ly/UYerR) In this model, undos are based on a "cascade" of hierarchal actions in the history, whereby a user can selectively undo an action (which also undos every subsequent action in that action's hierarchy). At first look, it seems that it would be fairly easy to model the action hierarchy at a higher level (e.g. CRUD operations on articles, comments, pages, etc.), but it appears things will get complicated at the content level for the content of a particular article or page. My first thought would be to look at the internal HTML representation of an article's content and base the action hierarchy off of changes to individual DOM nodes/attributes. Any further guidance on this issue would be greatly appreciated! ________________________________________________________________ Welcome to the Interaction Design Association (IxDA)! To post to this list ....... [email protected] Unsubscribe ................ http://www.ixda.org/unsubscribe List Guidelines ............ http://www.ixda.org/guidelines List Help .................. http://www.ixda.org/help
