UI Question (2)

[paul-d]

Hi Im relatively new to python, so I may have something very simple wrong.  Im trying to get a button to execute a command when pressed, I can achieve this fine normally but now that I have begun working with classes, Im struggling to get it to work.  I always recieve errors that the command is not defined.  Again sorry if it is something very simple. Thank you in advance.

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class Window(object):

def \_\_init\_\_(self):
	self.Win = 'Tool'
	self.text = "Text"
	self.wind()

def wind(self):
	if not cmds.window(self.Win, ex=1):
		cmds.window(self.Win)
		cmds.rowColumnLayout( numberOfColumns=2, columnWidth=[ (1, 250), (2,250) ])
		cmds.textField(self.text)
		cmds.button(l="Print Text", c=self.print())
	cmds.showWindow()	

def print(self):
	text = cmds.textField(self.text, tx=True, q=True)
	print text

[jan-ace]

Hey paul,

Im very new to python aswell. But i did some testing and i figured out that there are 3 problems.

1) maya reports the c=self.print() as an syntax error in maya 2011. this could be because print is also an existing command. but as far as i know this should not matter within a custom class. (I'd like some opinions on this aswell) So for now i changed it to: someDef

2) aparantly there is a difference between self.someDef() and self.someDef. As far as I can see the one without brackets works and the other one doesnt ^^. Maybe someone else can explain this.

3) you forgot to add the *args to the someDef command. As far as i know its always required when calling a def from outside of the class.
(i hope I explained it clearly enoug. Sry if I did not use the correct terminology )

The code below should work.

class Window(object):
 
	def __init__(self):
 
		self.Win = 'Tool'
 
		self.text = "Text"
 
		self.wind()
 
 
	def wind(self):
 
		if not cmds.window(self.Win, ex=1):
 
			cmds.window(self.Win)
 
			cmds.rowColumnLayout( numberOfColumns=2, columnWidth=[ (1, 250), (2,250) ])
 
			cmds.textField(self.text)
 
			cmds.button(l="Print Text", c=self.someDef)
 
		cmds.showWindow()	
 
 
 
	def someDef(self, *args):
 
		text = cmds.textField(self.text, tx=True, q=True)
 
		print text

[paul-d]

Hi thanks for that Jan, huge help, works perfectly now.  I didnt actually have the 'print' problem as I was working on Maya 2008 originally but now that im in Uni on 2011 I did have that problem.  Also do you know why you have to include the *args?

Thanks again

[joojaa]

  Also do you know why you have to include the *args?

you dont have to but the signature must match what maya pushes and maya items may push more then readily apparent at first. makig *args makes pyhon agnostic to whatever signature of unnamed variables passed as it accepts them all. In fact you can add *args,**dict to your calls and ANY signature will be accepted.

you dont need args it works if you do:

	def someDef(self, boolean):
		text = cmds.textField(self.text, tx=True, q=True)
		print text

Se the point is the button actually calls someDef(False) which is not your signature if you dont have the second parameter

PS: dont make the window unique by design, make it possible to open several windows. eg:

class Window(object):
	def __init__(self):
		self.Win = ''
		self.text = ''
		self.wind()
 
	def wind(self):
		self.Win = cmds.window()
		cmds.rowColumnLayout( numberOfColumns=2, columnWidth=[ (1, 250), (2,250) ])
		self.text = cmds.textField( )
		cmds.button(l="Print Text",ann="foo" , c=self.someDef)
		cmds.showWindow()	
 
	def someDef(self, *args):
		text = cmds.textField(self.text, tx=True, q=True)
		print text

But in reality you really want to make a panel not window 99% of the time but then you can not really use python*. Crap isnt it. Panels are much better in terms of usability as they are persitent and propagate hotkeys right. They can also be reinstantiated by the user to given state later

• the reason for this is that panels save with files so they need to be mel inorder to be able to save