Help: Implement the initial version of the cross-platform help/about page.

chrome/browser/resources/help/help.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+cr.define('help_page', function() {
+  var localStrings = new LocalStrings();
+
+  /**
+   * Encapsulated handling of the help page.
+   */
+  function HelpPage() {}
+
+  cr.addSingletonGetter(HelpPage);
+
+  HelpPage.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    /**
+     * Perform initial setup.
+     */
+    initialize: function() {
+      $('product-license').innerHTML = localStrings.getString('productLicense');
+
+      var productTOS = $('product-tos');
+      if (productTOS)
+        productTOS.innerHTML = localStrings.getString('productTOS');
+
+      if (!cr.isLinux) {
+        $('relaunch').onclick = function() {
+          chrome.send('relaunchNow');
+        };
+      }
+
+      // Attempt to update.
+      chrome.send('checkForUpdate');
+    },
+
+    /**
+     * @private
+     */
+    setUpdateImage_: function(state) {
+      $('update-status-icon').className = 'update-icon ' + state;
+    },
+
+    /**
+     * @private
+     */
+    setUpdateStatus_: function(status) {
+      if (status == 'checking') {
+        this.setUpdateImage_('available');
+        $('update-status').innerHTML =
+            localStrings.getString('updateCheckStarted');
+      } else if (status == 'updating') {
+        this.setUpdateImage_('available');
+        $('update-status').innerHTML = localStrings.getString('updating');
+      } else if (status == 'nearly_updated') {
+        this.setUpdateImage_('up-to-date');
+        $('update-status').innerHTML =
+            localStrings.getString('updateAlmostDone');
+      } else if (status == 'updated') {
+        this.setUpdateImage_('up-to-date');
+        $('update-status').innerHTML = localStrings.getString('upToDate');
+      }
+
+      $('update-percentage').hidden = status != 'updating';
+      $('relaunch').hidden = status != 'nearly_updated';
+    },
+
+    /**
+     * @private
+     */
+    setProgress_: function(progress) {
+      $('update-percentage').innerHTML = progress + "%";
+    }
+  };
+
+  HelpPage.setUpdateStatus = function(status) {
+    HelpPage.getInstance().setUpdateStatus_(status);
+  };
+
+  HelpPage.setProgress = function(progress) {
+    HelpPage.getInstance().setProgress_(progress);
+  };
+
+  // Export
+  return {
+    HelpPage: HelpPage
+  };
+
+});
+
+var HelpPage = help_page.HelpPage;
+
+window.onload = function() {
+  HelpPage.getInstance().initialize();
+};