Initial commit

Tested with a real MIDI keyboard.

.gitignore

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+.DS_Store
+.AppleDouble
+.LSOverride
+._*
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+.idea/
+cmake-build-*/
+*.iws
+out/
+.idea_modules/
+atlassian-ide-plugin.xml
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+.vscode/
+*.code-workspace
+.history/
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+*.stackdump
+[Dd]esktop.ini
+$RECYCLE.BIN/
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+*.lnk
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+pids
+*.pid
+*.seed
+*.pid.lock
+lib-cov
+coverage
+*.lcov
+.nyc_output
+.grunt
+bower_components
+.lock-wscript
+build/Release
+node_modules/
+jspm_packages/
+web_modules/
+*.tsbuildinfo
+.npm
+.eslintcache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+.node_repl_history
+*.tgz
+.yarn-integrity
+.env
+.env.test
+.cache
+.parcel-cache
+.next
+.nuxt
+dist
+.cache/
+.vuepress/dist
+.serverless/
+.fusebox/
+.dynamodb/
+.tern-port
+.vscode-test
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.pnp.*

index.js

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+const { app, BrowserWindow } = require('electron')
+const midi = require('midi')
+
+const SCREEN_HEIGHT = 96
+const SCREEN_WIDTH = 1152
+
+const createWindow = () => {
+  const win = new BrowserWindow({
+    width: SCREEN_WIDTH,
+    height: SCREEN_HEIGHT,
+    webPreferences: {
+      nodeIntegration: true
+    }
+  })
+
+  win.loadFile('pages/piano.html')
+
+  const input = new midi.Input()
+
+  if (input.getPortCount() > 0) {
+    input.openPort(0)
+  }
+
+  input.on('message', (deltaTime, message) => {
+    const [type, data1, data2] = message
+    switch (type) {
+      case 144:
+        win.webContents.send('note', data1 + ':' + data2)
+        break
+      case 176:
+        win.webContents.send('pedal', data1 + ':' + data2)
+        break
+    }
+  })
+}
+
+app
+  .whenReady()
+  .then(() => {
+    createWindow()
+  })
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit()
+  }
+})
+
+app.on('activate', () => {
+  if (BrowserWindow.getAllWindows().length === 0) {
+    createWindow()
+  }
+})

package.json

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+{
+  "name": "piano-keyboard-electron",
+  "version": "0.0.0",
+  "description": "Simple piano keyboard reading MIDI messages",
+  "main": "index.js",
+  "author": "TheoryOfNekomata <allan.crisostomo@outlook.com>",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "start": "electron ."
+  },
+  "devDependencies": {
+    "electron": "^9.1.2",
+    "electron-rebuild": "^1.11.0"
+  },
+  "dependencies": {
+    "midi": "^1.0.0"
+  }
+}