title: Exit full screen when "esc" is pressed (using javascript with electron)
body: <p>I'm working on an app (with electron) and I would like users to be able to exit fullscreen mode when pressing "esc". I tried different methods, in vain.
  Here is the code who  launch the app in a new browser window in fullscreen mode and display and HTML/CSS content :</p>
  
  <pre><code>    'use strict';
  
  const electron = require('electron');
  // Module to control application life.
  const app = electron.app;
  // Module to create native browser window.
  const BrowserWindow = electron.BrowserWindow;
  
  // 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;
  
  function createWindow () {
    // Create the browser window.
    mainWindow = new BrowserWindow({fullscreen:true});
  
    // and load the index.html of the app.
    mainWindow.loadURL('file://' + __dirname + '/index.html');
  
    // Emitted when the window is closed.
    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.
  app.on('ready', createWindow);
  
  // 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) {
      createWindow();
    }
  });
  </code></pre>
  
  <p>And here is what I'm trying to add to this code to be able to exit full screen but it doesn't work :</p>
  
  <pre><code>app.on('keydown', function(e){
      if(e.keyCode === 27){
        app.exitFullscreen();
      }
  });
  </code></pre>
  
  <p>I also tried with "cancelFullscreen". And "fullscreen:false". Not working.</p>
  
  <p>Thanks a lot for your attention!</p>