Connects/disconnects slots to/from signals when the mode state
        changed.

def on_state_changed(self, state):
        """
        Connects/disconnects slots to/from signals when the mode state
        changed.
        """
        super(GoToDefinitionMode, self).on_state_changed(state)
        if state:
            self.editor.mouse_moved.connect(self._on_mouse_moved)
            self.editor.mouse_released.connect(self._on_mouse_released)
            self.editor.add_action(self.action_goto, sub_menu='COBOL')
            self.editor.mouse_double_clicked.connect(
                self._timer.cancel_requests)
        else:
            self.editor.mouse_moved.disconnect(self._on_mouse_moved)
            self.editor.mouse_released.disconnect(self._on_mouse_released)
            self.editor.remove_action(self.action_goto, sub_menu='Python')
            self.editor.mouse_double_clicked.disconnect(
                self._timer.cancel_requests)