confirm.py

from gi.repository import GObject, Gtk

class ConfirmationBox(Gtk.HBox):
    def __init__(self):
        super(ConfirmationBox, self).__init__()

        self.label = Gtk.Label()
        self.label.get_style_context().add_class('confirm')
        self.yes_button = Gtk.Button("YES")
        self.no_button = Gtk.Button("NO")

        self.pack_start(self.label, True, True, 5)
        self.pack_start(self.yes_button, False, False, 5)
        self.pack_start(self.no_button, False, False, 5)

        self.yes_button.connect('clicked', self.click_yes)
        self.no_button.connect('clicked', self.click_no)

        self.counter = 0
        self.yes_callback = None
        self.no_callback = None

        self.timer = None

    def confirm(self, message, time, yes_callback=None, no_callback=None):
        self.yes_callback = yes_callback
        self.no_callback = no_callback
        self.label.set_text(message)

        self.counter = int(time)
        self.yes_button.get_child().set_text("YES (%d)" % self.counter)

        self.timer = GObject.timeout_add_seconds(1, self.countdown)
        self.yes_button.grab_focus()
        self.show()

    def click_yes(self, button = None):
        self.cancel_timer()
        self.hide()
        self.counter = 0
        if self.yes_callback:
            self.yes_callback()
        self.yes_callback = None

    def click_no(self, button = None):
        self.cancel_timer()
        self.hide()
        self.counter = 0
        if self.no_callback:
            self.no_callback()
        self.no_callback = None

    def countdown(self):
        if self.counter > 1:
            self.counter -= 1
            self.yes_button.get_child().set_text("YES (%d)" % self.counter)
            self.timer = GObject.timeout_add_seconds(1, self.countdown)
        else:
            self.click_yes()

    def cancel_timer(self):
        if self.timer != None:
            GObject.source_remove(self.timer)
        self.timer = None