Simple GTK clock

clock.py

#!/usr/bin/python3

# This code is licensed under the terms of the GPL3 license
# Written by: Oli Solomons
# 2023

import gi
gi.require_version("Gtk", "3.0")

from gi.repository import Gtk, Gdk, GLib
import threading
from datetime import *


class MyWindow(Gtk.Window):
    def __init__(self):
        super().__init__(title="Clock")
        self.set_decorated(False)
        self.fullscreen()

        self.connect("key-press-event", self.on_key_press_event)
        provider = Gtk.CssProvider()
        screen = Gdk.Screen.get_default()
        provider = Gtk.CssProvider()
        style_context = Gtk.StyleContext()
        style_context.add_provider_for_screen(
            screen, provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
        )
        css = b"""
        #clock_label {
            background: #383b40;
            font-family: Ubuntu;
            font-size: 40pt;
            color: #d3d3d3;
            border-radius: 5px;
            padding: 15px;
            box-shadow: 0 0 10px black;
        }
        """
        provider.load_from_data(css)

        self.grid = Gtk.Grid()
        self.add(self.grid)

        def expand(x, y):
            l = Gtk.Label(label=' ')
            l.set_hexpand(True)
            l.set_vexpand(True)
            self.grid.attach(l, x, y, 1, 1)

        expand(0, 0)

        self.clock = Gtk.Label()
        self.clock.set_name('clock_label')
        self.update_time()
        self.grid.attach(self.clock, 1, 1, 1, 1)

        expand(2, 2)

        # Initialize colors, alpha transparency
        self.set_app_paintable(1)
        self.gtk_screen = self.get_screen()

        if not self.gtk_screen.is_composited():
            self.supports_alpha = False
        else:
            self.supports_alpha = True

        self.alive = threading.RLock()
        self.alive.acquire()

        self.t = threading.Thread(target=self.time_loop)
        self.t.start()

    def expose(self, widget, event):
        pass

    def on_key_press_event(self, widget, event):
        if event.get_keyval()[1] in {ord('q'), ord('c'), Gdk.KEY_Escape}:
            self.alive.release()

    def time_loop(self):
        while not self.alive.acquire(timeout=1):
            GLib.idle_add(self.update_time)
            
        GLib.idle_add(Gtk.main_quit)
    
    def update_time(self):
        t = datetime.now()
        self.clock.set_text(t.strftime('%H:%M:%S'))

    def on_destroy(self):
        self.alive.release()


win = MyWindow()
win.show_all()
Gtk.main()

Again thank you very much. You can find my project over here: OpenRadio and i recommend using GLib.timeout_add instead of an thread.

Interesting project! I didn't know about GLib.timeout_add, thanks @1337Misom