chrome/browser/resources/uber/uber_frame.js

   1 // Copyright (c) 2012 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 // This file contains the navigation controls that are visible on the left side
   6 // of the uber page. It exists separately from uber.js so that it may be loaded
   7 // in an iframe. Iframes can be layered on top of each other, but not mixed in
   8 // with page content, so all overlapping content on uber must be framed.
   9
  10 <include src="../../../../ui/webui/resources/js/util.js"></include>
  11 <include src="uber_utils.js"></include>
  12
  13 cr.define('uber_frame', function() {
  14
  15   /**
  16    * Handles page initialization.
  17    */
  18   function onLoad() {
  19     var navigationItems = document.querySelectorAll('li');
  20
  21     for (var i = 0; i < navigationItems.length; ++i) {
  22       navigationItems[i].addEventListener('click', onNavItemClicked);
  23     }
  24
  25     window.addEventListener('message', handleWindowMessage);
  26     uber.invokeMethodOnParent('navigationControlsLoaded');
  27
  28     document.documentElement.addEventListener('mousewheel', onMouseWheel);
  29     cr.ui.FocusManager.disableMouseFocusOnButtons();
  30   }
  31
  32   /**
  33    * Handles clicks on the navigation controls (switches the page and updates
  34    * the URL).
  35    * @param {Event} e The click event.
  36    */
  37   function onNavItemClicked(e) {
  38     // Though pointer-event: none; is applied to the .selected nav item, users
  39     // can still tab to them and press enter/space which simulates a click.
  40     if (e.target.classList.contains('selected'))
  41       return;
  42
  43     // Extensions can override Uber content (e.g., if the user has a history
  44     // extension, it should display when the 'History' navigation is clicked).
  45     if (e.currentTarget.getAttribute('override') == 'yes') {
  46       window.open('chrome://' + e.currentTarget.getAttribute('controls'),
  47           '_blank');
  48       return;
  49     }
  50
  51     uber.invokeMethodOnParent('showPage',
  52        {pageId: e.currentTarget.getAttribute('controls')});
  53
  54     setSelection(e.currentTarget);
  55   }
  56
  57   /**
  58    * Handles postMessage from chrome://chrome.
  59    * @param {Event} e The post data.
  60    */
  61   function handleWindowMessage(e) {
  62     if (e.data.method === 'changeSelection')
  63       changeSelection(e.data.params);
  64     else if (e.data.method === 'adjustToScroll')
  65       adjustToScroll(e.data.params);
  66     else if (e.data.method === 'setContentChanging')
  67       setContentChanging(e.data.params);
  68     else
  69       console.error('Received unexpected message', e.data);
  70   }
  71
  72   /**
  73    * Changes the selected nav control.
  74    * @param {Object} params Must contain pageId.
  75    */
  76   function changeSelection(params) {
  77     var navItem =
  78         document.querySelector('li[controls="' + params.pageId + '"]');
  79     setSelection(navItem);
  80   }
  81
  82   /**
  83    * Sets selection on the given nav item.
  84    * @param {boolean} newSelection The item to be selected.
  85    */
  86   function setSelection(newSelection) {
  87     var lastSelectedNavItem = document.querySelector('li.selected');
  88     if (lastSelectedNavItem !== newSelection) {
  89       newSelection.classList.add('selected');
  90       if (lastSelectedNavItem)
  91         lastSelectedNavItem.classList.remove('selected');
  92     }
  93   }
  94
  95   /**
  96    * Adjusts this frame's content to scrolls from the outer frame. This is done
  97    * to obscure text in RTL as a user scrolls over the content of this frame (as
  98    * currently RTL scrollbars still draw on the right).
  99    * @param {number} scroll document.body.scrollLeft of the content frame.
 100    */
 101   function adjustToScroll(scrollLeft) {
 102     assert(isRTL());
 103     document.body.style.webkitTransform = 'translateX(' + -scrollLeft + 'px)';
 104   }
 105
 106   /**
 107    * Enable/disable an animation to ease the nav bar back into view when
 108    * changing content while horizontally scrolled.
 109    * @param {boolean} enabled Whether easing should be enabled.
 110    */
 111   function setContentChanging(enabled) {
 112     assert(isRTL());
 113     document.documentElement.classList[enabled ? 'add' : 'remove'](
 114         'changing-content');
 115   }
 116
 117   /**
 118    * Handles mouse wheels on the top level element. Forwards them to uber.js.
 119    * @param {Event} e The mouse wheel event.
 120    */
 121   function onMouseWheel(e) {
 122     uber.invokeMethodOnParent('mouseWheel',
 123         {deltaX: e.wheelDeltaX, deltaY: e.wheelDeltaY});
 124   }
 125
 126   /**
 127    * @return {Object} The currently selected iframe container.
 128    * @private
 129    */
 130   function getSelectedIframe() {
 131     return document.querySelector('.iframe-container.selected');
 132   }
 133
 134   /**
 135    * Finds the <li> element whose 'controls' attribute is |controls| and sets
 136    * its 'override' attribute to |override|.
 137    * @param {string} controls The value of the 'controls' attribute of the
 138    *     element to change.
 139    * @param {string} override The value to set for the 'override' attribute of
 140    *     that element (either 'yes' or 'no').
 141    */
 142   function setNavigationOverride(controls, override) {
 143     var navItem =
 144         document.querySelector('li[controls="' + controls + '"]');
 145     navItem.setAttribute('override', override);
 146   }
 147
 148   return {
 149     onLoad: onLoad,
 150     setNavigationOverride: setNavigationOverride,
 151   };
 152
 153 });
 154
 155 document.addEventListener('DOMContentLoaded', uber_frame.onLoad);