ShiftTranslatorComponent.py

# http://remotescripts.blogspot.com

# emacs-mode: -*- python-*-
# -*- coding: utf-8 -*-

from _Framework.ChannelTranslationSelector import ChannelTranslationSelector 
from _Framework.ButtonElement import ButtonElement 
from _Framework.MixerComponent import MixerComponent 
class ShiftTranslatorComponent(ChannelTranslationSelector):
    ' Class that translates the channel of some buttons as long as a shift button is held '
    __module__ = __name__

    def __init__(self):
        ChannelTranslationSelector.__init__(self)
        self._shift_button = None
        self._shift_pressed = False



    def disconnect(self):
        if (self._shift_button != None):
            self._shift_button.remove_value_listener(self._shift_value)
            self._shift_button = None
        ChannelTranslationSelector.disconnect(self)



    def set_shift_button(self, button):
        assert ((button == None) or (isinstance(button, ButtonElement) and button.is_momentary()))
        if (self._shift_button != None):
            self._shift_button.remove_value_listener(self._shift_value)
        self._shift_button = button
        if (self._shift_button != None):
            self._shift_button.add_value_listener(self._shift_value)
        self.set_mode(0)



    def on_enabled_changed(self):
        if self.is_enabled():
            self.set_mode(int(self._shift_pressed))



    def number_of_modes(self):
        return 2



    def _shift_value(self, value):
        assert (self._shift_button != None)
        assert (value in range(128))
        self._shift_pressed = (value != 0)
        if self.is_enabled():
            self.set_mode(int(self._shift_pressed))



# local variables:
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