Merge pull request #26 from atom/app-restore

Restore window on activate event

main.js

@@ -1,24 +1,16 @@
 'use strict';
+
 const electron = require('electron');
-const app = electron.app;  // Module to control application life.
-const BrowserWindow = electron.BrowserWindow;  // Module to create native browser window.
+// 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;
 
-// 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();
-  }
-});
-
-// This method will be called when Electron has finished
-// initialization and is ready to create browser windows.
-app.on('ready', function() {
+function createWindow () {
   // Create the browser window.
   mainWindow = new BrowserWindow({width: 800, height: 600});
 
@@ -35,4 +27,25 @@ app.on('ready', function() {
     // 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();
+  }
 });