[kepler-dev] text area undo/redo

[ben leinfelder]

Hi all,
There's been a request to add an "undo" feature when editing scripts  
in the RExpression actor.  See http://bugzilla.ecoinformatics.org/show_bug.cgi?id=3185

Locally, I have implemented an UndoableEditListener for the JTextArea  
that is used in ptolemy.gui.Query along with some supporting inner  
classes to facilitate the undoing and redoing of text edits.  This  
change would cascade to all actors when editing their parameters.   
While it seems like a useful feature to provide, it is in a ptII class  
and therefore should probably be reviewed by the larger community.

I've used the standard Ctrl+Z and Ctrl+Y shortcut mappings for undo  
and redo respectively.  And yes, "Ctrl" translates to "open apple/ 
command" key on the Mac.

Does anyone object to including this change?

Thanks,
-ben