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piano-midi-monitor
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Simple monitor for displaying MIDI status for digital pianos.
Vous ne pouvez pas sélectionner plus de 25 sujets Les noms de sujets doivent commencer par une lettre ou un nombre, peuvent contenir des tirets ('-') et peuvent comporter jusqu'à 35 caractères.
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piano-midi-monitor/src/components/PedalBoard/PedalBoard.tsx

116 lignes
15 KiB
Brut Annotations Historique 

  1. import * as React from 'react'

  2. 

  3. const PedalBoard = () => {

  4.   const [unaCorda, setUnaCorda, ] = React.useState(0)

  5.   const [sostenuto, setSostenuto, ] = React.useState(0)

  6.   const [sustain, setSustain, ] = React.useState(0)

  7.   const timer: React.MutableRefObject<number | null> = React.useRef(null)

  8. 

  9.   React.useEffect(() => {

  10.     const onMessage = (e: MessageEvent) => {

  11.       if (e.data.event !== 'pedal') {

  12.         return

  13.       }

  14. 

  15.       if (timer.current !== null) {

  16.         window.clearTimeout(timer.current)

  17.         timer.current = null

  18.       }

  19. 

  20.       const [which, value, ] = e.data.message.split(':')

  21.       timer.current = window.setTimeout(() => {

  22.         const setters: Record<number, Function> = {

  23.           64: setSustain,

  24.           66: setSostenuto,

  25.           67: setUnaCorda,

  26.         }

  27. 

  28.         const { [which]: theSetter, } = setters

  29.         theSetter(value)

  30.       }, 50)

  31.     }

  32. 

  33.     window.addEventListener('message', onMessage)

  34.     return () => {

  35.       window.removeEventListener('message', onMessage)

  36.     }

  37.   }, [])

  38. 

  39.   return (

  40.     <div

  41.       className="theme"

  42.       style={{

  43.         display: 'grid',

  44.         gridTemplateColumns: 'repeat(3, auto)',

  45.         alignItems: 'center',

  46.         padding: 'var(--size-close-button, 2rem) 1rem 1rem',

  47.         gap: '1rem',

  48.       }}

  49.     >

  50.       <svg

  51.         style={{

  52.           height: 24,

  53.           width: 56,

  54.           opacity: unaCorda / 127 * 0.75 + 0.25,

  55.           transition: 'opacity 125ms linear',

  56.           fill: 'currentColor',

  57.         }}

  58.         viewBox="0 0 1145 490"

  59.         xmlns="http://www.w3.org/2000/svg"

  60.       >

  61.         <g transform="matrix(5.55556,0,0,5.55556,-245.343,-1502.77)">

  62.           <g transform="matrix(6.58103,0,0,6.58103,-3224.18,-1979.7)">

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  69.       <svg

  70.         style={{

  71.           height: 24,

  72.           width: 44,

  73.           opacity: sostenuto / 127 * 0.75 + 0.25,

  74.           transition: 'opacity 125ms linear',

  75.           fill: 'currentColor',

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  77.         viewBox="0 0 975 534"

  78.         xmlns="http://www.w3.org/2000/svg"

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  111.     </div>

  112.   )

  113. }

  114. 

  115. export default PedalBoard