Comments on: Customizing uiundo

By: Yair Altman

Yair Altman — Tue, 20 Apr 2010 16:01:35 +0000

@Jason - when you undo steps, you first need to undo all the actions that followed your desired undo-action, because they might affect the way your undone action behaves. Effectively, you are unrolling the actions at the exact reverse order in which they happened. If you look at any program with an undo list, they all behave the same way (try any editor, for example). I actually think it's very intuitive.Regarding the scrollable undo/redo lists - see the previous post for an example. The scrollbar appears automatically when more than 8 list items are available. This is standard JComboBox behavior (the number 8 is a modifiable property of the JComboBox).

By: Jason McMains

Jason McMains — Tue, 20 Apr 2010 12:12:20 +0000

Sorry for more updates, but here is my current solution

for i=length(undoObj.CommandManager.UndoStack):-1:num
   undoObj.CommandManager.undo;
end

This does what I need, but it requires cycling through all the previous changes. I’d rather just skip to the desired step, because for my gui, this process is pretty slow.

By: Jason McMains

Jason McMains — Tue, 20 Apr 2010 11:47:58 +0000

small update: I’ve gotten this to work partially by using:

undoObj.CommandManager.UndoStack(num).execute;

but the undoObj structure wont update to reflect the changes.

Thanks Again

By: Jason McMains

Jason McMains — Tue, 20 Apr 2010 11:21:08 +0000

Hey Yair,
I’m trying to implement this in a GUI, and I have the basic functionality working, but I’m having trouble jumping to an undo point earlier than the most recent, i.e. if there are 5 possible undo actions, I would like to jump to the 3rd or 4th instead of the last.

Also, Do you know how to create the list box used in the function button or the cell button in the editor? its a context menu with a scroll bar on the side. I’d like to use that functionality for an undo dropdown.

Thanks for any help!
Jason

By: Venkat

Venkat — Wed, 11 Nov 2009 14:14:08 +0000

Hi Yair,
Can you please answer my query at
http://groups.google.com/group/comp.soft-sys.matlab/browse_thread/thread/8bba37279a78b926#

sorry for the irrevalent post here

thanks