action.py

from gi.repository import Gtk

class ActionView(Gtk.HBox):
    def __init__(self):
        super(ActionView, self).__init__()
        self.actions = set(['next', 'previous', 'light-on', 'light-off'])

        self.pack_start(Gtk.Label('Actions:'), False, False, 5)
        for action in self.actions:
            button = Gtk.Button(action)
            button.connect('clicked', self._perform)
            self.pack_start(button, False, False, 5)

        self.confiermer = None

    def _perform(self, button):
        action = button.get_label()
        if self.confirmer:
            self.confirmer.confirm('Perform action "%s"?' % action, 4, lambda: self.perform(action))
        else:
            self.perform(action)

    def perform(self, action):
        if action in self.actions:
            print 'PERFORM', action
            return True
        return False

    def actions(self):
        return self.actions

    def set_confirmer(self, confirmer):
        self.confirmer = confirmer