Off main thread GTK example

gtk_example.py

# Inverted version of the first example from https://wiki.gnome.org/Projects/PyGObject/Threading
# GTK runs in the spawned thread instead of the other way around.

import threading
import time

from gi.repository import GLib, Gtk, GObject


# yay hacks
registry = {}


def app_main():
    win = Gtk.Window(default_height=50, default_width=300)
    win.connect("delete-event", Gtk.main_quit)

    progress = Gtk.ProgressBar(show_text=True)
    win.add(progress)
    registry['progress'] = progress

    win.show_all()


if __name__ == "__main__":
    def start_gtk():
        app_main()
        Gtk.main()

    thread = threading.Thread(target=start_gtk)
    thread.daemon = True
    thread.start()

    def update_progess(i):
        progress = registry['progress']
        progress.pulse()
        progress.set_text(str(i))
        return False

    for i in range(50):
        GLib.idle_add(update_progess, i)
        time.sleep(0.2)