'What to do when press a mouse button over the cmus widget.
Will:
- toggle pause (or play if stopped) on left click;
- skip forward in playlist on scroll up;
- skip backward in playlist on scroll down.'

def button_press(self, x, y, button):

    if (button == 1):
        if (self.status in ('playing', 'paused')):
            subprocess.Popen(['cmus-remote', '-u'])
        elif (self.status == 'stopped'):
            subprocess.Popen(['cmus-remote', '-p'])
    elif (button == 4):
        subprocess.Popen(['cmus-remote', '-n'])
    elif (button == 5):
        subprocess.Popen(['cmus-remote', '-r'])
