private void HandleMidiNotePropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (sender == null)
{
return;
}
IMidiNote sourceNote = sender as IMidiNote;
if (sourceNote == null)
{
throw new ArgumentException("HandleMidiNotePropertyChanged expects an IMidiNote sender, but got a " + sender.GetType());
}
if (e.PropertyName == "Pressure")
{
lock (_voiceLock)
{
IEnumerable <SimpleVoice> voices = FindMatchingVoices(sourceNote);
voices.Where(v => v.IsActive).Execute(v => v.Intensity = v.FromMidiNote.Pressure);
}
}
if (e.PropertyName == "IsReleased" && sourceNote.IsReleased)
{
if (!ApplyHoldPedalToSustain || !_midiSource.HoldPedal)
{
lock (_voiceLock)
{
IEnumerable <SimpleVoice> voices = FindMatchingVoices(sourceNote);
_voices.Execute(KillNote);
}
}
}
}
private void HandleMidiNotesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
IMidiNote[] itemsToRemove;
IMidiNote[] itemsToAdd;
lock (_voiceLock)
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
// itemsToRemove is everything that used to be in the list but is not in the list now
itemsToRemove =
_lastNoteList.Where(on => !FindMatchingVoices(on).Any()).ToArray();
// itemsToAdd is evertying that is in the list now that wasn't the list before
itemsToAdd = _midiSource.ActiveNotes.Where(on => !_lastNoteList.Any(an => an.Number == on.Number)).ToArray();
}
else
{
itemsToRemove = (e.OldItems ?? new IMidiNote[0]).OfType <IMidiNote>().ToArray();
itemsToAdd = (e.NewItems ?? new IMidiNote[0]).OfType <IMidiNote>().ToArray();
}
foreach (int i in Enumerable.Range(0, itemsToRemove.Length))
{
IMidiNote note = itemsToRemove[i];
IEnumerable <SimpleVoice> toKill = FindMatchingVoices(note);
toKill.Execute(KillNote);
}
foreach (IMidiNote note in itemsToAdd)
{
SimpleVoice voice = GetLowestPriorityVoice();
// this could only be null if there are zero voices, which is not allowed
if (voice == null)
{
throw new InvalidOperationException("No voices found.");
}
voice.FromMidiNote = note;
if (NumberOfVoices > 1 || !IsLegato)
{
voice.Intensity = 0;
}
SetPitch(voice);
if (!voice.IsActive || NumberOfVoices > 1 || !IsLegato)
{
voice.Intensity = note.Velocity;
}
voice.IsActive = true;
}
_lastNoteList = _midiSource.ActiveNotes;
}
}
private IEnumerable <SimpleVoice> FindMatchingVoices(IMidiNote note)
{
SimpleVoice[] voices = _voices.Where(v => v.FromMidiNote != null && v.FromMidiNote.Number == note.Number).ToArray();
return(voices);
}
