main.js

const {
  app, Menu, Tray,
  BrowserWindow,
  nativeImage,
  ipcMain
} = require('electron')

const path = require('path')
const url = require('url')

const icon = nativeImage.createFromPath(path.resolve(__dirname, './assets/icon.ico'))

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let tray, menu
let mainWindow, loadingWindow, buildingWindow

async function initialization() {
  tray = new Tray(icon)
  tray.setToolTip('Thulium Music')

  menu = Menu.buildFromTemplate([
    {
      label: 'Thulium'
    },
    {
      type: 'separator'
    },
    {
      label: '开发者工具',
      click: () => {
        if (mainWindow.webContents.isDevToolsOpened()) {
          mainWindow.webContents.closeDevTools()
        } else {
          mainWindow.webContents.openDevTools()
        }
      }
    },
    {
      label: '退出',
      role: 'quit'
    }
  ])

  tray.setContextMenu(menu)
  tray.on('click', () => {
    mainWindow.show()
  })

  // For test
  // return new Promise(resolve => {
  //   setTimeout(() => resolve(20), 2000)
  // })
}

function createMainWindow() {
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    center: true,
    minWidth: 480,
    minHeight: 320,
    icon: icon,
    show: false,
    frame: false
  })

  // and load the index.html of the app.
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }))

  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', async function() {
  loadingWindow = new BrowserWindow({
    width: 400,
    height: 300,
    transparent: true,
    frame: false,
    resizable: false,
    movable: false,
    icon: icon
  })

  loadingWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'load.html'),
    protocol: 'file:',
    slashes: true
  }))

  await initialization()

  createMainWindow()

  mainWindow.once('ready-to-show', () => {
    loadingWindow.destroy()
    mainWindow.show()
  })
})

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createMainWindow()
  }
})

// This method will be called when render process is started.
// Whem global environment is set to 1 or 2,
// `build/structure.json` will be automatically generated.
ipcMain.on('start', (_, env) => {
  if (env) {
    buildingWindow = new BrowserWindow({
      webPreferences: {
        offscreen: env === 1
      },
      show: env === 2
    })
    buildingWindow.loadURL(url.format({
      pathname: path.join(__dirname, 'build/index.html'),
      protocol: 'file:',
      slashes: true
    }))
  } else {
    // Hide dev tools, no use, seek reason.
    menu.items[2].visible === false

    // Call this again for Linux because we modified the context menu
    if (process.platform !== 'linux') {
      tray.setContextMenu(menu)
    }
  }
})

ipcMain.on('close', () => {
  if (buildingWindow) {
    buildingWindow.destroy()
  }
})