Instrument Open NBT (Capability)

This mod stores inside of the player's NBT whether their instrument's screen is open in the form of a boolean byte. It is located under instrument_caps.instrumentOpen.

Usages

When the arm pose of a player holding an instrument is evaluated, it is first checked whether if the instrument is actually active - thus, if the screen is open. It is done like so (source):

@Override
public @Nullable ArmPose getArmPose(LivingEntity entityLiving, InteractionHand hand, ItemStack itemStack) {
    if (!(entityLiving instanceof Player))
        return null;
    final Player player = (Player)entityLiving;
    
    // Check if the instrument is actually open
    final LazyOptional<InstrumentOpen> lazyOpen = player.getCapability(InstrumentOpenProvider.INSTRUMENT_OPEN);
    if (!lazyOpen.isPresent() || !lazyOpen.resolve().get().isOpen())
        return null;


    return PLAYING_INSTRUMENT;
}