pyQT in maya question

Coding
,
1

Hey guys,

I started playing with Qt after reading about it in the GUI thread and I got it up and running great, launching commands, etc.

I ran into one thing that I was wondering if it’s a common issue.

If I have a script that is a series of command (say create a bunch of locators) , if I run it through PyQT the undo queue gets filled with each operation separately, as opposed to the normal behavior of “grouping” all of those actions under the script call.

Is it something I’m doing wrong while launching pyQT or is it a known issue?

Any info would be helpful,

Thanks!

2

I have the same problem.

No solutions for the moment, but your are not alone now ! :D:

Flo

3

Which version of maya do you have ?

Flo

4

When I have come across this problem before I have just wrapped my script in an undoInfo wrapper.


maya.cmds.undoInfo(openChunk=True)
try:
	# call your script here	
finally:
	maya.cmds.undoInfo(closeChunk=True)

The use of the try, finally is important.
If for whatever reason you script gets an error and you don’t call closeChunk Maya’s undo stack will break and make things very unstable.

5

I have just see your answer !
Thank you ! It working now !

6

Not just a QT issue, I’ve run into similar behavior with regular maya gui. It’s pretty hard to track down sometimes…

7

Was the solution to put the undInfo in the UI callbacks or in the scripts the callback sources?

8

A little while back I started a decorators library such as showing wait cursors and echoing the method being called.
This is the make any function undo-able decorator.

def d_undoable(f):
    """
     A decorator that will make commands undoable in maya
    """

    def func(*args, **kwargs):
        cmds.undoInfo(openChunk=True)
        functionReturn = None
        try:
            functionReturn = f(*args, **kwargs)

        except:
            print sys.exc_info()[1]

        finally:
            cmds.undoInfo(closeChunk=True)
            return functionReturn

    func.__name__ = f.__name__
    func.__doc__ = f.__doc__

    return func

Not a great example but you get the idea.

@d_undoable
def someFunction():
    for i in range(10):
       print "blah"

-Sean

9

[QUOTE=snolan;29255]A little while back I started a decorators library such as showing wait cursors and echoing the method being called.
This is the make any function undo-able decorator.

def d_undoable(f):
    """
     A decorator that will make commands undoable in maya
    """

    def func(*args, **kwargs):
        cmds.undoInfo(openChunk=True)
        functionReturn = None
        try:
            functionReturn = f(*args, **kwargs)

        except:
            print sys.exc_info()[1]

        finally:
            cmds.undoInfo(closeChunk=True)
            return functionReturn

    func.__name__ = f.__name__
    func.__doc__ = f.__doc__

    return func

Not a great example but you get the idea.

@d_undoable
def someFunction():
    for i in range(10):
       print "blah"

-Sean[/QUOTE]

Instead of

 
    func.__name__ = f.__name__
    func.__doc__ = f.__doc__

use functools.wraps, it handles all of the remapping of names, docs, etc…
Also, don’t use bare except blocks, this will block things like SystemExit, which you really don’t ever want to block. If you need to catch Maya’s exceptions, use RuntimeError. Which is still really broad, but well it is the best we’ve got, unless you’re using PyMel.

import functools
def d_undoable(f):
    """
     A decorator that will make commands undoable in maya
    """
    @functools.wraps(f)
    def func(*args, **kwargs):
        cmds.undoInfo(openChunk=True)
        functionReturn = None
        try:
            functionReturn = f(*args, **kwargs)
        except RuntimeError as e:
            print e.message

        finally:
            cmds.undoInfo(closeChunk=True)
            return functionReturn

    return func
10

Nice, thanks Mr. White! Much cleaner :slight_smile: