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import gi
gi.require_version("Gtk", "4.0")
from gi.repository import Gtk, GLib
class SpinnerAnimation(Gtk.ApplicationWindow):
def __init__(self, **kargs):
super().__init__(**kargs, title="Spinner Demo")
main_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
self.set_child(main_box)
self.spinner = Gtk.Spinner()
main_box.append(self.spinner)
self.label = Gtk.Label()
main_box.append(self.label)
self.entry = Gtk.Entry()
self.entry.props.text = "10"
main_box.append(self.entry)
self.button_start = Gtk.Button(label="Start timer")
self.button_start.connect("clicked", self.on_button_start_clicked)
main_box.append(self.button_start)
self.button_stop = Gtk.Button(label="Stop timer")
self.button_stop.props.sensitive = False
self.button_stop.connect("clicked", self.on_button_stop_clicked)
main_box.append(self.button_stop)
self.timeout_id = None
self.connect("unrealize", self.on_window_destroy)
def on_button_start_clicked(self, _widget):
"""Handles 'clicked' event of button_start."""
self.start_timer()
def on_button_stop_clicked(self, _widget):
"""Handles 'clicked' event of button_stop."""
self.stop_timer("Stopped from button")
def on_window_destroy(self, _widget):
"""Handles unrealize event of main window."""
# Ensure the timeout function is stopped
if self.timeout_id:
GLib.source_remove(self.timeout_id)
self.timeout_id = None
def on_timeout(self):
"""A timeout function.
Return True to stop it.
This is not a precise timer since next timeout
is recalculated based on the current time.
"""
self.counter -= 1
if self.counter <= 0:
self.stop_timer("Reached time out")
return False
self.label.props.label = f"Remaining: {int(self.counter / 4)!s}"
return True
def start_timer(self):
"""Start the timer."""
self.button_start.props.sensitive = False
self.button_stop.props.sensitive = True
# time out will check every 250 milliseconds (1/4 of a second)
self.counter = 4 * int(self.entry.props.text)
self.label.props.label = f"Remaining: {int(self.counter / 4)!s}"
self.spinner.start()
self.timeout_id = GLib.timeout_add(250, self.on_timeout)
def stop_timer(self, label_text):
"""Stop the timer."""
if self.timeout_id:
GLib.source_remove(self.timeout_id)
self.timeout_id = None
self.spinner.stop()
self.button_start.props.sensitive = True
self.button_stop.props.sensitive = False
self.label.props.label = label_text
def on_activate(app):
win = SpinnerAnimation(application=app)
win.present()
app = Gtk.Application(application_id="com.example.App")
app.connect("activate", on_activate)
app.run(None)
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