aiexperiments-ai-duet/static/app/keyboard/Element.js

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/**
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import events from 'events'
import 'style/keyboard.css'
import 'pepjs'
import {Roll} from 'roll/Roll'
const offsets = [0, 0.5, 1, 1.5, 2, 3, 3.5, 4, 4.5, 5, 5.5, 6]
class KeyboardElement extends events.EventEmitter {
constructor(container, lowest=36, octaves=4){
super()
this._container = document.createElement('div')
this._container.id = 'keyboard'
container.setAttribute('touch-action', 'none')
container.addEventListener('pointerup', () => this._mousedown = false)
container.appendChild(this._container)
this._keys = {}
this._mousedown = false
this.resize(lowest, octaves)
/**
* The piano roll
* @type {Roll}
*/
this._roll = new Roll(container)
}
resize(lowest, octaves){
this._keys = {}
// clear the previous ones
this._container.innerHTML = ''
// each of the keys
const keyWidth = (1 / 7) / octaves
for (let i = lowest; i < lowest + octaves * 12; i++){
let key = document.createElement('div')
key.classList.add('key')
let isSharp = ([1, 3, 6, 8, 10].indexOf(i % 12) !== -1)
key.classList.add(isSharp ? 'black' : 'white')
this._container.appendChild(key)
// position the element
let noteOctave = Math.floor(i / 12) - Math.floor(lowest / 12)
let offset = offsets[i % 12] + noteOctave * 7
key.style.width = `${keyWidth * 100}%`
key.style.left = `${offset * keyWidth * 100}%`
key.id = i.toString()
key.setAttribute('touch-action', 'none')
const fill = document.createElement('div')
fill.id = 'fill'
key.appendChild(fill)
this._bindKeyEvents(key)
this._keys[i] = key
}
}
_bindKeyEvents(key){
key.addEventListener('pointerover', (e) => {
if (this._mousedown){
const noteNum = parseInt(e.target.id)
// this.keyDown(noteNum, false)
this.emit('keyDown', noteNum)
} else {
key.classList.add('hover')
}
})
key.addEventListener('pointerout', (e) => {
if (this._mousedown){
const noteNum = parseInt(e.target.id)
// this.keyUp(noteNum, false)
this.emit('keyUp', noteNum)
} else {
key.classList.remove('hover')
}
})
key.addEventListener('pointerdown', (e) => {
e.preventDefault()
const noteNum = parseInt(e.target.id)
// this.keyDown(noteNum, false)
this.emit('keyDown', noteNum)
this._mousedown = true
})
key.addEventListener('pointerup', (e) => {
e.preventDefault()
const noteNum = parseInt(e.target.id)
// this.keyUp(noteNum, false)
this.emit('keyUp', noteNum)
this._mousedown = false
})
}
keyDown(noteNum, ai=false){
// console.log('down', noteNum, ai)
if (this._keys.hasOwnProperty(noteNum)){
const key = this._keys[noteNum]
key.classList.remove('hover')
const highlight = document.createElement('div')
highlight.classList.add('highlight')
highlight.classList.add('active')
if (ai){
highlight.classList.add('ai')
}
key.querySelector('#fill').appendChild(highlight)
this._roll.keyDown(noteNum, this._getNotePosition(noteNum), ai)
}
}
keyUp(noteNum, ai=false){
// console.log('up', noteNum, ai)
if (this._keys.hasOwnProperty(noteNum)){
const query = ai ? '.highlight.active.ai' : '.highlight.active'
const highlight = this._keys[noteNum].querySelector(query)
if (highlight){
highlight.classList.remove('active')
setTimeout(() => highlight.remove(), 2000)
//and up on the roll
} else {
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//try again
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this.keyUp(noteNum)
}
}
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this._roll.keyUp(noteNum, ai)
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}
_getNotePosition(key){
if (this._keys.hasOwnProperty(key)){
return this._keys[key].querySelector('#fill').getBoundingClientRect()
}
}
}
export {KeyboardElement}