59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
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/**
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import events from 'events'
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import WebMidi from 'webmidi'
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class Midi extends events.EventEmitter{
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constructor(){
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super()
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this._isEnabled = false
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WebMidi.enable((err) => {
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if (!err){
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this._isEnabled = true
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if (WebMidi.inputs){
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WebMidi.inputs.forEach((input) => this._bindInput(input))
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}
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WebMidi.addListener('connected', (device) => {
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if (device.input){
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this._bindInput(device.input)
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}
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})
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}
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})
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}
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_bindInput(inputDevice){
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if (this._isEnabled){
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WebMidi.addListener('disconnected', (device) => {
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if (device.input){
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device.input.removeListener('noteOn')
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device.input.removeListener('noteOff')
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}
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})
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inputDevice.addListener('noteon', 'all', (event) => {
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this.emit('keyDown', event.note.number)
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})
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inputDevice.addListener('noteoff', 'all', (event) => {
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this.emit('keyUp', event.note.number)
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})
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}
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}
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}
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export {Midi}
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