Stumbling Toward 'Awesomeness'

A Technical Art Blog

Wednesday, April 7, 2010

PyQt4 UIC Module Example

I have been really amazing myself at how much knowledge I have forgotten in the past five or six months… Most of the work I did in the past year utilized the UIC module to load UI files directly, but I can find very little information about this online. I was surprised to see that even the trusty old Rapid GUI Programming with Python and Qt book doesn’t cover loading UI files with the UIC module.

So, here is a tiny script with UI file [download] that will generate a pyqt example window that does ‘stuff’:

import sys
from PyQt4 import QtGui, QtCore, uic
 
class TestApp(QtGui.QMainWindow):
	def __init__(self):
		QtGui.QMainWindow.__init__(self)
 
		self.ui = uic.loadUi('X:/projects/2010/python/pyqt_tutorial/pyqt_tutorial.ui')
		self.ui.show()
 
		self.connect(self.ui.doubleSpinBox, QtCore.SIGNAL("valueChanged(double)"), spinFn)
		self.connect(self.ui.comboBox, QtCore.SIGNAL("currentIndexChanged(QString)"), comboFn)
		self.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"), buttonFn)
 
def spinFn(value):
	win.ui.doubleSpinBoxLabel.setText('doubleSpinBox is set to ' + str(value))
def buttonFn():
	win.ui.setWindowTitle(win.ui.lineEdit.text())
def comboFn(value):
	win.ui.comboBoxLabel.setText(str(value) + ' is selected')
 
if __name__ == "__main__":
	app = QtGui.QApplication(sys.argv)
	win = TestApp()
	sys.exit(app.exec_())

Change the path to reflect where you have saved the UI file, and when you run the script you should get this:

EDIT: A few people have asked me to update this for other situations

PySide Inside Maya:

import sys
from PySide.QtUiTools import *
from PySide.QtCore import *
from PySide.QtGui import *
 
class TestApp(QMainWindow):
	def __init__(self):
		QMainWindow.__init__(self)
 
		loader = QUiLoader()
		self.ui = loader.load('c:/pyqt_tutorial.ui')
		self.ui.show()
 
		self.connect(self.ui.doubleSpinBox, SIGNAL("valueChanged(double)"), spinFn)
		self.connect(self.ui.comboBox, SIGNAL("currentIndexChanged(QString)"), comboFn)
		self.connect(self.ui.pushButton, SIGNAL("clicked()"), buttonFn)
 
def spinFn(value):
	win.ui.doubleSpinBoxLabel.setText('doubleSpinBox is set to ' + str(value))
def buttonFn():
	win.ui.setWindowTitle(win.ui.lineEdit.text())
def comboFn(value):
	win.ui.comboBoxLabel.setText(str(value) + ' is selected')
 
win = TestApp()

PyQT Inside Maya:

import sys
from PyQt4 import QtGui, QtCore, uic
 
class TestApp(QtGui.QMainWindow):
	def __init__(self):
		QtGui.QMainWindow.__init__(self)
 
		self.ui = uic.loadUi('c:/pyqt_tutorial.ui')
		self.ui.show()
 
		self.connect(self.ui.doubleSpinBox, QtCore.SIGNAL("valueChanged(double)"), spinFn)
		self.connect(self.ui.comboBox, QtCore.SIGNAL("currentIndexChanged(QString)"), comboFn)
		self.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"), buttonFn)
 
def spinFn(value):
	win.ui.doubleSpinBoxLabel.setText('doubleSpinBox is set to ' + str(value))
def buttonFn():
	win.ui.setWindowTitle(win.ui.lineEdit.text())
def comboFn(value):
	win.ui.comboBoxLabel.setText(str(value) + ' is selected')
 
win = TestApp()
posted by admin at 11:54 PM  

5 Comments »

  1. Thanks for this helpful post!

    Comment by Angel — 2011/12/16 @ 7:15 PM

  2. Thank you
    your post is helpful

    Comment by Enu — 2012/12/04 @ 3:30 PM

  3. Thanks a lot!!! I could have never run my app without this post!!!
    Thanks again! :)

    Comment by Ashish Ranjan — 2012/12/19 @ 7:41 AM

  4. Chris,
    I copied and pasted the TestApp example (the first one) and it come up with an error;
    Traceback (most recent call last):
    File “testapp.py”, line 4, in
    class TestApp(QtGui.QMainWindow):
    File “testapp.py”, line 11, in TestApp
    self.connect(self.ui.doubleSpinBox, QtCore.SIGNAL(“valueChanged(double)”), spinFn)
    NameError: name ‘self’ is not defined

    I don’t understand why.

    Ron.

    Comment by Ron — 2013/06/27 @ 2:36 PM

  5. Thank you. Helped getting started with QT-Designer and Maya. :)

    Comment by kogen — 2014/01/06 @ 3:23 PM

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