[Bf-python] mesh.update() without undo push

[Stephen Swaney]

On Sat, Mar 19, 2005 at 03:35:27AM -0800, Gert De Roost wrote:
> 
> This is why I would propose an optional "No Undo"
> argument to mesh.update().  One could then call
> mesh.update("No Undo") at every intermediate step of
> the realtime mesh update process, and only do a
> regular mesh.update() at the end, when the user
> validates the changes.
> 
> This way, one press of Ctrl-Z will undo the entire
> operation of the script and previous operations will
> still be available for undo.
> 
> There might be other methods for which this applies,
> for the moment I am only aware of the one
> (mesh.update).  Maybe a global Blender.Undo(0/1)
> switch would be more appropiate ?

Without looking at the code involved ( or thinking too hard! ), I
wonder if a better solution is to provide access to the push and pop
functions of the undo stack.  This would give the scripter control
over the stack in a way similar to the BeginTransaction and Rollback
commands in database programming.  Most Bpy scripting *is*
manipulating Blender's database, after all.

Pushing and popping the undo stack would also apply to other datatypes
and be generally useful in scripts.

-- 
Stephen Swaney			
sswaney at centurytel.net