electron/lib/browser/api/browser-window.js

'use strict'

const electron = require('electron')
const { WebContentsView, TopLevelWindow } = electron
const { BrowserWindow } = process.atomBinding('window')

Object.setPrototypeOf(BrowserWindow.prototype, TopLevelWindow.prototype)

BrowserWindow.prototype._init = function () {
  // Call parent class's _init.
  TopLevelWindow.prototype._init.call(this)

  // Avoid recursive require.
  const { app } = electron

  // Create WebContentsView.
  this.setContentView(new WebContentsView(this.webContents))

  const nativeSetBounds = this.setBounds
  this.setBounds = (bounds, ...opts) => {
    bounds = {
      ...this.getBounds(),
      ...bounds
    }
    nativeSetBounds.call(this, bounds, ...opts)
  }

  // window.resizeTo(...)
  // window.moveTo(...)
  this.webContents.on('move', (event, size) => {
    this.setBounds(size)
  })

  // Hide the auto-hide menu when webContents is focused.
  this.webContents.on('activate', () => {
    if (process.platform !== 'darwin' && this.isMenuBarAutoHide() && this.isMenuBarVisible()) {
      this.setMenuBarVisibility(false)
    }
  })

  // Change window title to page title.
  this.webContents.on('page-title-updated', (event, title, ...args) => {
    // Route the event to BrowserWindow.
    this.emit('page-title-updated', event, title, ...args)
    if (!this.isDestroyed() && !event.defaultPrevented) this.setTitle(title)
  })

  // Sometimes the webContents doesn't get focus when window is shown, so we
  // have to force focusing on webContents in this case. The safest way is to
  // focus it when we first start to load URL, if we do it earlier it won't
  // have effect, if we do it later we might move focus in the page.
  //
  // Though this hack is only needed on macOS when the app is launched from
  // Finder, we still do it on all platforms in case of other bugs we don't
  // know.
  this.webContents.once('load-url', function () {
    this.focus()
  })

  // Redirect focus/blur event to app instance too.
  this.on('blur', (event) => {
    app.emit('browser-window-blur', event, this)
  })
  this.on('focus', (event) => {
    app.emit('browser-window-focus', event, this)
  })

  // Subscribe to visibilityState changes and pass to renderer process.
  let isVisible = this.isVisible() && !this.isMinimized()
  const visibilityChanged = () => {
    const newState = this.isVisible() && !this.isMinimized()
    if (isVisible !== newState) {
      isVisible = newState
      const visibilityState = isVisible ? 'visible' : 'hidden'
      this.webContents.emit('-window-visibility-change', visibilityState)
    }
  }

  const visibilityEvents = ['show', 'hide', 'minimize', 'maximize', 'restore']
  for (const event of visibilityEvents) {
    this.on(event, visibilityChanged)
  }

  // Notify the creation of the window.
  app.emit('browser-window-created', {}, this)

  Object.defineProperty(this, 'devToolsWebContents', {
    enumerable: true,
    configurable: false,
    get () {
      return this.webContents.devToolsWebContents
    }
  })
}

const isBrowserWindow = (win) => {
  return win && win.constructor.name === 'BrowserWindow'
}

BrowserWindow.fromId = (id) => {
  const win = TopLevelWindow.fromId(id)
  return isBrowserWindow(win) ? win : null
}

BrowserWindow.getAllWindows = () => {
  return TopLevelWindow.getAllWindows().filter(isBrowserWindow)
}

BrowserWindow.getFocusedWindow = () => {
  for (const window of BrowserWindow.getAllWindows()) {
    if (window.isFocused() || window.isDevToolsFocused()) return window
  }
  return null
}

BrowserWindow.fromWebContents = (webContents) => {
  for (const window of BrowserWindow.getAllWindows()) {
    if (window.webContents.equal(webContents)) return window
  }
}

BrowserWindow.fromBrowserView = (browserView) => {
  for (const window of BrowserWindow.getAllWindows()) {
    if (window.getBrowserView() === browserView) return window
  }

  return null
}

BrowserWindow.fromDevToolsWebContents = (webContents) => {
  for (const window of BrowserWindow.getAllWindows()) {
    const { devToolsWebContents } = window
    if (devToolsWebContents != null && devToolsWebContents.equal(webContents)) {
      return window
    }
  }
}

// Helpers.
Object.assign(BrowserWindow.prototype, {
  loadURL (...args) {
    return this.webContents.loadURL(...args)
  },
  getURL (...args) {
    return this.webContents.getURL()
  },
  loadFile (...args) {
    return this.webContents.loadFile(...args)
  },
  reload (...args) {
    return this.webContents.reload(...args)
  },
  send (...args) {
    return this.webContents.send(...args)
  },
  openDevTools (...args) {
    return this.webContents.openDevTools(...args)
  },
  closeDevTools () {
    return this.webContents.closeDevTools()
  },
  isDevToolsOpened () {
    return this.webContents.isDevToolsOpened()
  },
  isDevToolsFocused () {
    return this.webContents.isDevToolsFocused()
  },
  toggleDevTools () {
    return this.webContents.toggleDevTools()
  },
  inspectElement (...args) {
    return this.webContents.inspectElement(...args)
  },
  inspectServiceWorker () {
    return this.webContents.inspectServiceWorker()
  },
  showDefinitionForSelection () {
    return this.webContents.showDefinitionForSelection()
  },
  capturePage (...args) {
    return this.webContents.capturePage(...args)
  },
  setTouchBar (touchBar) {
    electron.TouchBar._setOnWindow(touchBar, this)
  },
  setBackgroundThrottling (allowed) {
    this.webContents.setBackgroundThrottling(allowed)
  }
})

module.exports = BrowserWindow