Python. Doing some work on background with Gtk GUI
Question:   * **python 3.2.2**
  * **gtk3 3.2.2**
  * **python-gobject 3.0.2**

I'm trying to display a GUI and do some work in the background. As I
understand it should look something like this:

    
    
    #!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import time
    from threading import Thread
    from gi.repository import Gtk, Gdk
    
    class Gui():
            def run(self):
                    self.Window = Gtk.Window()
                    self.Window.set_border_width(8)
                    self.Window.set_title("Некий GUI")
                    self.Window.connect('destroy', lambda x: self.stop())
    
                    self.outBut = Gtk.Button.new_from_stock(Gtk.STOCK_OK)
                    self.outBut.set_size_request(150, 35)
                    self.outBut.connect('clicked', lambda x: self.passfun)
                    self.Window.add(self.outBut)
    
                    self.Window.show_all()
    
            def stop(self):
                    Gtk.main_quit()
    
            def passfun(self):
                    pass
    
    class LoopSleep(Thread):
            def run(self):
                    i = 1
                    while True:
                            print(i)
                            i = i + 1
                            #time.sleep(1)
    
    
    
    gui = Gui()
    gui.run()
    
    loopSleep = LoopSleep()
    loopSleep.start()
    
    Gdk.threads_init()
    Gdk.threads_enter()
    Gtk.main()
    Gdk.threads_leave()
    

But it does not work. Several cycles occurs when you press the button. And the
cycle runs after the window is closed. But not together.

What I do wrong?


Answer: Can't claim to be any expert on python threading nor gtk3 but after playing
around a little with your example I found something that appears to work the
way you want it. Instead of sub classing Thread i use
threading.start(target=loop_sleep), and placed that inside Gui.

Glib.threads_init() also seem to be needed.

    
    
    #!/usr/bin/env python3
    from gi.repository import Gtk,Gdk, GLib
    import threading 
    import time
    
    class Gui(Gtk.Window):
      def __init__(self):
          self.Window = Gtk.Window()
          self.Window.set_border_width(8)
          self.Window.set_title("Некий GUI")
          self.Window.connect('destroy', lambda x: self.stop())
    
          self.outBut = Gtk.Button.new_from_stock(Gtk.STOCK_OK)
          self.outBut.set_size_request(150, 35)
          self.Window.connect('destroy', lambda x: self.stop())
          self.Window.add(self.outBut)
    
          self.Window.show_all()
          threading.Thread(target=loop_sleep).start()
    
      def stop(self):
          Gtk.main_quit()
    
      def passfun(self):
          pass
    
    def loop_sleep():
          i = 1
          while True:
               print(i)
               i = i + 1
               #time.sleep(1)
    
    
    
    app = Gui()
    GLib.threads_init()
    Gdk.threads_init()
    Gdk.threads_enter()
    Gtk.main()
    Gdk.threads_leave()
    

