[PySide] Why doesn't this example work?

[Stefan Champailler]

Hi!

I've no explanation neither... But I'd say that may be due to the fact that during the time.seep, your application is not processing GUI events since at that point app.exec_() has not yet been called). You could try to make a pause by using a QTimer, but that'd imply to app.exec_() before (and maybe you precisely want to avoid that...)

you could also try :

for t in range(3)
    for i in range(100): # Strange name to avoid defining local variable...
        app.processEvents()
    time.sleep(1)

I had to do that to have a QSplashScreen to display properly (and a QSplashScreen definitely is a window outside the application loop, like what I understand you try to do)

stF



Jim Byrnes <jf_byrnes at comcast.net> wrote:



> In looking at the lists archives, I see that most of the participants 
> seem to be experienced developers.  As a novice programmer I hope I am 
> not intruding by asking some basic questions.
> 
> I am working my way through examples in a PySide book I bought. 
> According to the author the example should display a 200 x 150 window, 
> pause 3 seconds and then display a 300 x 300 window.  On my system 
> (Ubuntu 12.04) there is a approx 3 second delay after starting the 
> program and then I see the 300 x 300 window. I never see the first window.
> 
> Could someone explain to me why it does not act as described?
> 
> # Import required modules
> import sys
> import time
> from PySide.QtGui import QApplication, QWidget
> 
> class SampleWindow(QWidget):
>      """ Our main window class
>      """
> 
>      # Constructor function
>      def __init__(self):
>          QWidget.__init__(self)
>          self.setWindowTitle("Sample Window")
>          self.setGeometry(300, 300, 200, 150)
>          self.setMinimumHeight(100)
>          self.setMinimumWidth(250)
>          self.setMaximumHeight(200)
>          self.setMaximumWidth(800)
> 
> if __name__ == '__main__':
>      # Exception Handling
>      try:
>          myApp = QApplication(sys.argv)
>          myWindow = SampleWindow()
>          myWindow.show()
>          time.sleep(3)
>          myWindow.resize(300, 300)
>          myWindow.setWindowTitle("Sample Window Resized")
>          myWindow.repaint()
>          myApp.exec_()
>          sys.exit(0)
>      except NameError:
>          print("Name Error:", sys.exc_info()[1])
>      except SystemExit:
>          print("Closing Window...")
>      except Exception:
>          print (sys.exc_info()[1])
> 
> Thanks,  Jim
> 
> _______________________________________________
> PySide mailing list
> PySide at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/pyside


-- 
Timeo Danaos et dona ferentes
Twitter : @Arakowa1