[Seaside] Re: strong undo

Paul DeBruicker pdebruic at gmail.com
Thu Dec 12 22:38:39 UTC 2013

Something like that.  I don't know where to find a definition I can point
to.  So to be less vague this is what I have in mind.  

As you both know the back button 'undoes' your navigation on regular links
but can't undo a form submission or ajax requests that change things in the
app.  I'd like to be able to offer a way to undo/redo those too, when
appropriate.  To make experimenting and mistakes less costly for a user.  So
that they do not have to remember what they changed, and when.    

Ideally the undo of the navigation and the undo of the app changes would be
tied either to the back button or just a button on the page.  One canonical
spot for 'undo-ing' things a user does. I know I can't undo things like
sending emails, but I'd like to be able to say: if you spend a half hour
experimenting on this you can get back to where you were exactly before you

If it were a single user app I could probably get away with keeping a stack
of model states for the user's whole model.  Since it is a  multi-user app
that seems really complicated.  User A's temporary changes may or may not
conflict with user B's permanent changes.  

Maybe, as a first step, what I need is to just let a user make a copy of
their whole model and pretend there is a playground/walled garden/simulator
where a they can do experiments, and then when they're done either let them
adopt the copy as their new model or keep it to mess with later.  

Anyway, if you have any ideas I'd love to hear them.  



Bob Arning-2 wrote
> maybe something like (from Gimp):
> *Strong undo/redo*
> By pressing Shift+Ctrl+Z / Shift+Ctrl+Y it is now possible to undo a 
> bunch of actions at one time. This is good for experimenting on something!
> On 12/12/13 4:05 PM, Philippe Marschall wrote:
>> On Thu, Dec 12, 2013 at 8:09 PM, Paul DeBruicker <

> pdebruic@

> > wrote:
>>> Does anyone have a strategy for implementing strong undo in a Seaside
>>> app?
>> What is strong undo?
>> Cheers
>> Philippe
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