CODEWITHSUNDEEP
pythongtk3
joaquinlpereyra
joaquinlpereyra

Reputation: 966

GTK+3: Ask confirmation before application quit

I'm trying to ask the user for confirmation when he tries to quit my application. But I don't know how to catch all the different ways the user can quit the app: there's the 'X' button on the window, Alt+F4, I myself use Alt+Shift+Q on i3.

How would one go o about this?

Upvotes: 4

Views: 2156

Answers (1)

ebassi
ebassi

Reputation: 8805

You should connect to the delete-event of the Gtk.Window you use at the application window. The delete-event allows you to show a confirmation dialog, and, depending on the user response, you can either return True — meaning that you handled the event, and that the signal propagation should be stopped; or return False — meaning that the signal propagation should continue, which will cause the destroy() method to be called on the widget.

The delete-event signal is emitted in response of a termination request from the window manager; for instance, when using the window menu; a key combination like Alt+F4; or the window's "Close" button.

A simple example demonstrating the above:

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

from gi.repository import Gio
from gi.repository import Gtk

class AppWindow (Gtk.ApplicationWindow):
    def __init__(self):
        Gtk.ApplicationWindow.__init__(self)
        self.set_default_size(200, 200)

    # Override the default handler for the delete-event signal
    def do_delete_event(self, event):
        # Show our message dialog
        d = Gtk.MessageDialog(transient_for=self,
                              modal=True,
                              buttons=Gtk.ButtonsType.OK_CANCEL)
        d.props.text = 'Are you sure you want to quit?'
        response = d.run()
        d.destroy()

        # We only terminate when the user presses the OK button
        if response == Gtk.ResponseType.OK:
            print('Terminating...')
            return False

        # Otherwise we keep the application open
        return True

def on_activate(app):
    # Show the application window
    win = AppWindow()
    win.props.application = app
    win.show()

if __name__ == '__main__':
    # Create an application instance
    app = Gtk.Application(application_id='com.example.ExampleApp', flags=0)

    # Use ::activate to show our application window
    app.connect('activate', on_activate)
    app.run()

Upvotes: 7

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