MIDI; //requiring would form a circular dependency :(
//Set up prototype interface object and inheritance chain
function MIDIOutput(name) {
MIDIPort.call(this, name, 'output');
//now is a good time to load in the MIDI depedency
if (MIDI === undefined) {
//require lookup is expensive
MIDI = require('interfaces/MIDI');
}
}
function MIDIInput(name) {
MIDIPort.call(this, name, 'input');
var self = this,
eventHandler = null,
attributes = {
onmessage: {
set: function (aFunction) {
//clear prevously set event handler
if (eventHandler !== null) {
this.removeEventListener('message', eventHandler, false);
eventHandler = null;
}
//check if callable
if (aFunction.call && typeof aFunction.call === 'function') {
this.addEventListener('message', aFunction, false);
eventHandler = aFunction;
}
return eventHandler;
},
get: function () {
return eventHandler;
},
enumerable: false,
configurable: false
}
};
function messageCallback(timestamp, data) {
var e = new MIDIEvent('message', {
data: new Uint8Array(data),
port: self
});
self.dispatchEvent(e);
}
if (MIDI === undefined) {
MIDI = require('interfaces/MIDI');
}
Object.defineProperties(this, attributes);
//Listen for messages
MIDI.midiInOpen(name, messageCallback);
}