chrome/browser/resources/app_list/start_page.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview App launcher start page implementation.
   7  */
   8
   9 cr.define('appList.startPage', function() {
  10   'use strict';
  11
  12   // The element containing the current Google Doodle.
  13   var doodle = null;
  14
  15   /**
  16    * Initialize the page.
  17    */
  18   function initialize() {
  19     chrome.send('initialize');
  20   }
  21
  22   /**
  23    * Invoked when the app-list bubble is shown.
  24    */
  25   function onAppListShown() {
  26     chrome.send('appListShown', [this.doodle != null]);
  27   }
  28
  29   /**
  30    * Sets the doodle's visibility, hiding or showing the default logo.
  31    *
  32    * @param {boolean} visible Whether the doodle should be made visible.
  33    */
  34   function setDoodleVisible(visible) {
  35     var doodle = $('doodle');
  36     var defaultLogo = $('default_logo');
  37     if (visible) {
  38       doodle.style.display = 'flex';
  39       defaultLogo.style.display = 'none';
  40     } else {
  41       if (doodle)
  42         doodle.style.display = 'none';
  43
  44       defaultLogo.style.display = 'block';
  45     }
  46   }
  47
  48   /**
  49    * Invoked when the app-list doodle is updated.
  50    *
  51    * @param {Object} data The data object representing the current doodle.
  52    */
  53   function onAppListDoodleUpdated(data, base_url) {
  54     if (this.doodle) {
  55       this.doodle.parentNode.removeChild(this.doodle);
  56       this.doodle = null;
  57     }
  58
  59     var doodleData = data.ddljson;
  60     if (!doodleData || !doodleData.transparent_large_image) {
  61       setDoodleVisible(false);
  62       return;
  63     }
  64
  65     // Set the page's base URL so that links will resolve relative to the Google
  66     // homepage.
  67     $('base').href = base_url;
  68
  69     this.doodle = document.createElement('div');
  70     this.doodle.id = 'doodle';
  71     this.doodle.style.display = 'none';
  72
  73     var doodleImage = document.createElement('img');
  74     doodleImage.id = 'doodle_image';
  75     if (doodleData.alt_text) {
  76       doodleImage.alt = doodleData.alt_text;
  77       doodleImage.title = doodleData.alt_text;
  78     }
  79
  80     doodleImage.onload = function() {
  81       setDoodleVisible(true);
  82     };
  83     doodleImage.src = doodleData.transparent_large_image.url;
  84
  85     if (doodleData.target_url) {
  86       var doodleLink = document.createElement('a');
  87       doodleLink.id = 'doodle_link';
  88       doodleLink.href = doodleData.target_url;
  89       doodleLink.target = '_blank';
  90       doodleLink.appendChild(doodleImage);
  91       doodleLink.onclick = function() {
  92         chrome.send('doodleClicked');
  93         return true;
  94       };
  95       this.doodle.appendChild(doodleLink);
  96     } else {
  97       this.doodle.appendChild(doodleImage);
  98     }
  99     $('logo_container').appendChild(this.doodle);
 100   }
 101
 102   return {
 103     initialize: initialize,
 104     onAppListDoodleUpdated: onAppListDoodleUpdated,
 105     onAppListShown: onAppListShown,
 106   };
 107 });
 108
 109 document.addEventListener('contextmenu', function(e) { e.preventDefault(); });
 110 document.addEventListener('DOMContentLoaded', appList.startPage.initialize);