lossless-cut/public/electron.js

const electron = require('electron'); // eslint-disable-line
const isDev = require('electron-is-dev');
const unhandled = require('electron-unhandled');
const i18n = require('i18next');
const debounce = require('lodash/debounce');
const yargsParser = require('yargs-parser');
const JSON5 = require('json5');

const logger = require('./logger');
const menu = require('./menu');
const configStore = require('./configStore');

const { checkNewVersion } = require('./update-checker');

require('./i18n');

const { app, ipcMain } = electron;
const { BrowserWindow } = electron;

// https://github.com/electron/electron/issues/18397
app.allowRendererProcessReuse = true;

unhandled({
  showDialog: true,
});

app.name = 'LosslessCut';

let filesToOpen = [];

// 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 mainWindow;

let askBeforeClose = false;
let rendererReady = false;
let newVersion;

const openFiles = (paths) => mainWindow.webContents.send('openFiles', paths);


// https://github.com/electron/electron/issues/526#issuecomment-563010533
function getSizeOptions() {
  const bounds = configStore.get('windowBounds');
  const options = {};
  if (bounds) {
    const area = electron.screen.getDisplayMatching(bounds).workArea;
    // If the saved position still valid (the window is entirely inside the display area), use it.
    if (
      bounds.x >= area.x
      && bounds.y >= area.y
      && bounds.x + bounds.width <= area.x + area.width
      && bounds.y + bounds.height <= area.y + area.height
    ) {
      options.x = bounds.x;
      options.y = bounds.y;
    }
    // If the saved size is still valid, use it.
    if (bounds.width <= area.width || bounds.height <= area.height) {
      options.width = bounds.width;
      options.height = bounds.height;
    }
  }
  return options;
}

function createWindow() {
  mainWindow = new BrowserWindow({
    ...getSizeOptions(),
    darkTheme: true,
    webPreferences: {
      enableRemoteModule: true,
      contextIsolation: false,
      nodeIntegration: true,
      // https://github.com/electron/electron/issues/5107
      webSecurity: !isDev,
    },
  });

  if (isDev) mainWindow.loadURL('http://localhost:3001');
  // Need to useloadFile for special characters https://github.com/mifi/lossless-cut/issues/40
  else mainWindow.loadFile('build/index.html');

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', () => {
    // 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;
  });

  // https://stackoverflow.com/questions/39574636/prompt-to-save-quit-before-closing-window/47434365
  mainWindow.on('close', (e) => {
    if (!askBeforeClose) return;

    const choice = electron.dialog.showMessageBoxSync(mainWindow, {
      type: 'question',
      buttons: ['Yes', 'No'],
      title: i18n.t('Confirm quit'),
      message: i18n.t('Are you sure you want to quit?'),
    });
    if (choice === 1) {
      e.preventDefault();
    }
  });

  const debouncedSaveWindowState = debounce(() => {
    if (!mainWindow) return;
    const { x, y, width, height } = mainWindow.getNormalBounds();
    configStore.set('windowBounds', { x, y, width, height });
  }, 500);

  mainWindow.on('resize', debouncedSaveWindowState);
  mainWindow.on('move', debouncedSaveWindowState);
}

function updateMenu() {
  menu(app, mainWindow, newVersion);
}

function openFilesEventually(paths) {
  if (rendererReady) openFiles(paths);
  else filesToOpen = paths;
}

// https://github.com/electron/electron/issues/3657
// https://github.com/mifi/lossless-cut/issues/357
// https://github.com/mifi/lossless-cut/issues/639
// https://github.com/mifi/lossless-cut/issues/591
function parseCliArgs(rawArgv = process.argv) {
  const ignoreFirstArgs = isDev ? 2 : 1;
  // production: First arg is the LosslessCut executable
  // dev: First 2 args are electron and the electron.js
  const argsWithoutAppName = rawArgv.length > ignoreFirstArgs ? rawArgv.slice(ignoreFirstArgs) : [];

  return yargsParser(argsWithoutAppName);
}

const argv = parseCliArgs();

if (!argv.allowMultipleInstances && !app.requestSingleInstanceLock()) {
  app.quit();
} else {
  // On macOS, the system enforces single instance automatically when users try to open a second instance of your app in Finder, and the open-file and open-url events will be emitted for that.
  // However when users start your app in command line, the system's single instance mechanism will be bypassed, and you have to use this method to ensure single instance.
  // This can be tested with one terminal: npx electron .
  // and another terminal: npx electron . path/to/file.mp4
  app.on('second-instance', (event, commandLine) => {
    // Someone tried to run a second instance, we should focus our window.
    if (mainWindow) {
      if (mainWindow.isMinimized()) mainWindow.restore();
      mainWindow.focus();
    }

    const argv2 = parseCliArgs(commandLine);
    if (argv2._) openFilesEventually(argv2._);
  });

  // 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 () => {
    // https://github.com/electron/electron/issues/23757
    // https://github.com/electron/electron/pull/28489
    // TODO I think this can be removed when we are on electron 12 or 14
    if (isDev) {
      electron.protocol.registerFileProtocol('file', (request, callback) => {
        const pathname = decodeURIComponent(request.url.replace('file:///', ''));
        callback(pathname);
      });
    }

    await configStore.init();

    logger.info('CLI arguments', argv);
    // Only if no files to open already (open-file might have already added some files)
    if (filesToOpen.length === 0) filesToOpen = argv._;
    const { settingsJson } = argv;

    if (settingsJson != null) {
      logger.info('initializing settings', settingsJson);
      Object.entries(JSON5.parse(settingsJson)).forEach(([key, value]) => {
        configStore.set(key, value);
      });
    }

    if (isDev) {
      const { default: installExtension, REACT_DEVELOPER_TOOLS } = require('electron-devtools-installer'); // eslint-disable-line global-require,import/no-extraneous-dependencies

      installExtension(REACT_DEVELOPER_TOOLS)
        .then(name => logger.info('Added Extension', name))
        .catch(err => logger.error('Failed to add extension', err));
    }

    createWindow();
    updateMenu();

    if (!process.windowsStore && !process.mas) {
      newVersion = await checkNewVersion();
      // newVersion = '1.2.3';
      if (newVersion) updateMenu();
    }
  });

  // Quit when all windows are closed.
  app.on('window-all-closed', () => {
    app.quit();
  });

  app.on('activate', () => {
    // 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) {
      createWindow();
    }
  });

  ipcMain.on('renderer-ready', () => {
    rendererReady = true;
    if (filesToOpen.length > 0) openFiles(filesToOpen);
  });

  // Mac OS open with LosslessCut
  // Emitted when the user wants to open a file with the application. The open-file event is usually emitted when the application is already open and the OS wants to reuse the application to open the file.
  app.on('open-file', (event, path) => {
    openFilesEventually([path]);
    event.preventDefault(); // recommended in docs https://www.electronjs.org/docs/latest/api/app#event-open-file-macos
  });

  ipcMain.on('setAskBeforeClose', (e, val) => {
    askBeforeClose = val;
  });

  ipcMain.on('setLanguage', (e, language) => {
    i18n.changeLanguage(language).then(() => updateMenu()).catch((err) => logger.error('Failed to set language', err));
  });
}

function focusWindow() {
  try {
    app.focus({ steal: true });
  } catch (err) {
    logger.error('Failed to focus window', err);
  }
}

module.exports = { focusWindow };