#!/usr/bin/python3

import sys
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk

class AppWindow(Gtk.ApplicationWindow):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.set_border_width(10)
        self.set_size_request(200, 50)
        eventbox = Gtk.EventBox.new()
        label = Gtk.Label.new("Double-Click Me!")
        eventbox.set_above_child(False)
        eventbox.connect("button_press_event", self.on_button_pressed, label)
        eventbox.add(label)
        self.add(eventbox)
        eventbox.set_events(Gdk.EventMask.BUTTON_PRESS_MASK)
        eventbox.realize()

    def on_button_pressed(self, eventbox, event, label):
        if event.type == Gdk.EventType._2BUTTON_PRESS:
            text = label.get_text()
            if text[0] == 'D':
                label.set_text("I Was Double-Clicked!")
            else:
                label.set_text("Double-Click Me Again!")
        return False

class Application(Gtk.Application):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, application_id="org.example.myapp",
                         **kwargs)
        self.window = None

    def do_activate(self):
        if not self.window:
            self.window = AppWindow(application=self, title="Hello World!")
        self.window.show_all()
        self.window.present()

if __name__ == "__main__":
    app = Application()
    app.run(sys.argv)