Options2: Pull the trigger.

chrome/browser/resources/options2/about_page.js

+// Copyright (c) 2011 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('options', function() {
+  const OptionsPage = options.OptionsPage;
+
+  /**
+   * The number of milliseconds used for showing a message.
+   * @type {number}
+   */
+  const MESSAGE_DELAY_MS = 1000;  // 1 sec.
+
+  /**
+   * Encapsulated handling of about page.
+   */
+  function AboutPage() {
+    OptionsPage.call(this, 'about', templateData.aboutPageTabTitle,
+                     'aboutPage');
+  }
+
+  cr.addSingletonGetter(AboutPage);
+
+  AboutPage.prototype = {
+    // Inherit AboutPage from OptionsPage.
+    __proto__: OptionsPage.prototype,
+
+    /**
+     * The queue is used for updating the status message with delay, like:
+     * [["Check for update...", 1000], ["Chrome OS is up to date", 0]]
+     * @type {!Array.<!Array>}
+     */
+    statusMessageQueue_: [],
+
+    /**
+     * True if the status message queue flush started.
+     * @type {boolean}
+     */
+    statusMessageQueueFlushStarted_: false,
+
+    /**
+     * The selected release channel.
+     * @type {string}
+     */
+    selectedChannel_: '',
+
+    // Initialize AboutPage.
+    initializePage: function() {
+      // Call base class implementation to start preference initialization.
+      OptionsPage.prototype.initializePage.call(this);
+
+      $('checkNow').onclick = function(event) {
+        chrome.send('CheckNow');
+      };
+
+      $('moreInfoButton').onclick = function(event) {
+        $('aboutPageLessInfo').hidden = true;
+        $('aboutPageMoreInfo').hidden = false;
+      };
+
+      if (!AccountsOptions.currentUserIsOwner()) {
+        $('channelSelect').disabled = true;
+      } else {
+        var self = this;
+        $('channelSelect').onchange = function(event) {
+          self.selectedOptionOnChange_(event.target.value);
+        };
+      }
+
+      // Notify the handler that the page is ready.
+      chrome.send('PageReady');
+    },
+
+    // Update the Default Browsers section based on the current state.
+    updateOSVersion_: function(versionString) {
+      $('osVersion0').textContent = versionString;
+      $('osVersion1').textContent = versionString;
+    },
+
+    updateOSFirmware_: function(firmwareString) {
+      $('osFirmware0').textContent = firmwareString;
+      $('osFirmware1').textContent = firmwareString;
+    },
+
+    /**
+     * Updates the status message like "Checking for update...".
+     * @param {string} message The message to be shown.
+     * @param {boolean} insertDelay show the message for a while.
+     * @private
+     */
+    updateStatus_: function(message, insertDelay) {
+      // Add the message to the queue with delay if needed.
+      // The delay is inserted so users can read the message.
+      var delayMs = insertDelay ? MESSAGE_DELAY_MS : 0;
+      this.statusMessageQueue_.push([message, delayMs]);
+      // Start the periodic flusher if not started.
+      if (this.statusMessageQueueFlushStarted_ == false) {
+        this.flushStatusMessageQueuePeriodically_();
+      }
+    },
+
+    /**
+     * Flushes the status message queue periodically using a timer.
+     * @private
+     */
+    flushStatusMessageQueuePeriodically_: function() {
+      // Stop the periodic flusher if the queue becomes empty.
+      if (this.statusMessageQueue_.length == 0) {
+        this.statusMessageQueueFlushStarted_ = false;
+        return;
+      }
+      this.statusMessageQueueFlushStarted_ = true;
+
+      // Update the status message.
+      var pair = this.statusMessageQueue_.shift();
+      var message = pair[0];
+      var delayMs = pair[1];
+      $('updateStatus').textContent = message;
+
+      // Schedule the next flush with delay as needed.
+      var self = this;
+      window.setTimeout(
+          function() { self.flushStatusMessageQueuePeriodically_() },
+          delayMs);
+    },
+
+    updateEnable_: function(enable) {
+      $('checkNow').disabled = !enable;
+    },
+
+    setReleaseChannel_: function(channel) {
+      // Write the value into the pref which will end up in the policy.
+      // Eventually, the update engine will use the policy value as the
+      // source truth for the update channel (see http://crosbug/17015).
+      Preferences.setStringPref("cros.system.releaseChannel", channel);
+      this.selectedChannel_ = channel;
+      chrome.send('SetReleaseTrack', [channel]);
+    },
+
+    selectedOptionOnChange_: function(value) {
+      if (value == 'dev-channel') {
+        // Open confirm dialog.
+        var self = this;
+        AlertOverlay.show(
+          localStrings.getString('channel_warning_header'),
+          localStrings.getString('channel_warning_text'),
+          localStrings.getString('ok'),
+          localStrings.getString('cancel'),
+          function() {
+            // Ok, so set release track and update selected channel.
+            $('channelWarningBlock').hidden = false;
+            self.setReleaseChannel_(value); },
+          function() {
+            // Cancel, so switch back to previous selected channel.
+            self.updateSelectedOption_(self.selectedChannel_); }
+          );
+      } else {
+        $('channelWarningBlock').hidden = true;
+        this.setReleaseChannel_(value);
+      }
+    },
+
+    // Updates the selected option in 'channelSelect' <select> element.
+    updateSelectedOption_: function(value) {
+      var options = $('channelSelect').querySelectorAll('option');
+      for (var i = 0; i < options.length; i++) {
+        var option = options[i];
+        if (option.value == value) {
+          option.selected = true;
+          this.selectedChannel_ = value;
+        }
+      }
+      if (value == 'dev-channel')
+        $('channelWarningBlock').hidden = false;
+    },
+
+    // Changes the "check now" button to "restart now" button.
+    changeToRestartButton_: function() {
+      $('checkNow').textContent = localStrings.getString('restart_now');
+      $('checkNow').disabled = false;
+      $('checkNow').onclick = function(event) {
+        chrome.send('RestartNow');
+      };
+    },
+  };
+
+  AboutPage.updateOSVersionCallback = function(versionString) {
+    AboutPage.getInstance().updateOSVersion_(versionString);
+  };
+
+  AboutPage.updateOSFirmwareCallback = function(firmwareString) {
+    AboutPage.getInstance().updateOSFirmware_(firmwareString);
+  };
+
+  AboutPage.updateStatusCallback = function(message, insertDelay) {
+    AboutPage.getInstance().updateStatus_(message, insertDelay);
+  };
+
+  AboutPage.updateEnableCallback = function(enable) {
+    AboutPage.getInstance().updateEnable_(enable);
+  };
+
+  AboutPage.updateSelectedOptionCallback = function(value) {
+    AboutPage.getInstance().updateSelectedOption_(value);
+  };
+
+  AboutPage.setUpdateImage = function(state) {
+    $('updateIcon').className= 'update-icon ' + state;
+  };
+
+  AboutPage.changeToRestartButton = function() {
+    AboutPage.getInstance().changeToRestartButton_();
+  };
+
+  // Export
+  return {
+    AboutPage: AboutPage
+  };
+
+});