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mixer: Add trigger_events_for_any_changes()

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Lifted from Mopidy-ALSAMixer, so SoftwareMixer can use it too.
This commit is contained in:
Stein Magnus Jodal 2014-07-12 02:49:33 +02:00
parent 5f091c10c2
commit 2c4ba8b6a1
1 changed files with 23 additions and 0 deletions
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23
mopidy/mixer.py
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@ -106,6 +106,29 @@ class Mixer(object):
logger.debug('Mixer event: mute_changed(muted=%s)', muted)
MixerListener.send('mute_changed', muted=muted)
def trigger_events_for_any_changes(self):
"""
Checks current volume and mute, compares with old values, and emits
events if anything has changed.
This method should be called by subclasses when they know something has
changed, and events needs to be sent.
"""
if not hasattr(self, '_last_volume'):
self._last_volume = None
if not hasattr(self, '_last_muted'):
self._last_muted = None
old_volume, self._last_volume = self._last_volume, self.get_volume()
old_muted, self._last_muted = self._last_muted, self.get_mute()
if old_volume != self._last_volume:
self.trigger_volume_changed(self._last_volume)
if old_muted != self._last_muted:
self.trigger_mute_changed(self._last_muted)
class MixerListener(listener.Listener):
"""