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">
  11 <include src="uber_utils.js">
  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     cr.ui.FocusOutlineManager.forDocument(this);
  26
  27     window.addEventListener('message', handleWindowMessage);
  28     uber.invokeMethodOnParent('navigationControlsLoaded');
  29
  30     document.documentElement.addEventListener('mousewheel', onMouseWheel);
  31     document.documentElement.addEventListener('mousedown', onMouseDown);
  32   }
  33
  34   /**
  35    * Handles clicks on the navigation controls (switches the page and updates
  36    * the URL).
  37    * @param {Event} e The click event.
  38    */
  39   function onNavItemClicked(e) {
  40     // Though pointer-event: none; is applied to the .selected nav item, users
  41     // can still tab to them and press enter/space which simulates a click.
  42     if (e.target.classList.contains('selected'))
  43       return;
  44
  45     // Extensions can override Uber content (e.g., if the user has a history
  46     // extension, it should display when the 'History' navigation is clicked).
  47     if (e.currentTarget.getAttribute('override') == 'yes') {
  48       window.open('chrome://' + e.currentTarget.getAttribute('controls'),
  49           '_blank');
  50       return;
  51     }
  52
  53     uber.invokeMethodOnParent('showPage',
  54        {pageId: e.currentTarget.getAttribute('controls')});
  55
  56     setSelection(e.currentTarget);
  57   }
  58
  59   /**
  60    * Handles postMessage from chrome://chrome.
  61    * @param {Event} e The post data.
  62    */
  63   function handleWindowMessage(e) {
  64     if (e.data.method === 'changeSelection')
  65       changeSelection(e.data.params);
  66     else if (e.data.method === 'adjustToScroll')
  67       adjustToScroll(e.data.params);
  68     else if (e.data.method === 'setContentChanging')
  69       setContentChanging(e.data.params);
  70     else
  71       console.error('Received unexpected message', e.data);
  72   }
  73
  74   /**
  75    * Changes the selected nav control.
  76    * @param {Object} params Must contain pageId.
  77    */
  78   function changeSelection(params) {
  79     var navItem =
  80         document.querySelector('li[controls="' + params.pageId + '"]');
  81     setSelection(navItem);
  82     showNavItems();
  83   }
  84
  85   /**
  86    * @return {Element} The currently selected nav item, if any.
  87    */
  88   function getSelectedNavItem() {
  89     return document.querySelector('li.selected');
  90   }
  91
  92   /**
  93    * Sets selection on the given nav item.
  94    * @param {Element} newSelection The item to be selected.
  95    */
  96   function setSelection(newSelection) {
  97     var items = document.querySelectorAll('li');
  98     for (var i = 0; i < items.length; ++i) {
  99       items[i].classList.toggle('selected', items[i] == newSelection);
 100       items[i].setAttribute('aria-selected', items[i] == newSelection);
 101     }
 102   }
 103
 104   /**
 105    * Shows nav items belonging to the same group as the selected item.
 106    */
 107   function showNavItems() {
 108     var navItems = document.querySelectorAll('li');
 109     var selectedNavItem = getSelectedNavItem();
 110     assert(selectedNavItem);
 111
 112     var selectedGroup = selectedNavItem.getAttribute('group');
 113     for (var i = 0; i < navItems.length; ++i) {
 114       navItems[i].hidden = navItems[i].getAttribute('group') != selectedGroup;
 115     }
 116   }
 117
 118   /**
 119    * Adjusts this frame's content to scrolls from the outer frame. This is done
 120    * to obscure text in RTL as a user scrolls over the content of this frame (as
 121    * currently RTL scrollbars still draw on the right).
 122    * @param {number} scroll document.body.scrollLeft of the content frame.
 123    */
 124   function adjustToScroll(scrollLeft) {
 125     assert(isRTL());
 126     document.body.style.webkitTransform = 'translateX(' + -scrollLeft + 'px)';
 127   }
 128
 129   /**
 130    * Enable/disable an animation to ease the nav bar back into view when
 131    * changing content while horizontally scrolled.
 132    * @param {boolean} enabled Whether easing should be enabled.
 133    */
 134   function setContentChanging(enabled) {
 135     assert(isRTL());
 136     document.documentElement.classList.toggle('changing-content', enabled);
 137   }
 138
 139   /**
 140    * Handles mouse wheels on the top level element. Forwards them to uber.js.
 141    * @param {Event} e The mouse wheel event.
 142    */
 143   function onMouseWheel(e) {
 144     uber.invokeMethodOnParent('mouseWheel',
 145         {deltaX: e.wheelDeltaX, deltaY: e.wheelDeltaY});
 146   }
 147
 148   /**
 149    * Handles mouse presses on the top level element. Forwards them to uber.js.
 150    * @param {Event} e The mouse down event.
 151    */
 152   function onMouseDown(e) {
 153     uber.invokeMethodOnParent('mouseDown');
 154   }
 155
 156   /**
 157    * @return {Element} The currently selected iframe container.
 158    * @private
 159    */
 160   function getSelectedIframe() {
 161     return document.querySelector('.iframe-container.selected');
 162   }
 163
 164   /**
 165    * Finds the <li> element whose 'controls' attribute is |controls| and sets
 166    * its 'override' attribute to |override|.
 167    * @param {string} controls The value of the 'controls' attribute of the
 168    *     element to change.
 169    * @param {string} override The value to set for the 'override' attribute of
 170    *     that element (either 'yes' or 'no').
 171    */
 172   function setNavigationOverride(controls, override) {
 173     var navItem =
 174         document.querySelector('li[controls="' + controls + '"]');
 175     navItem.setAttribute('override', override);
 176   }
 177
 178   return {
 179     onLoad: onLoad,
 180     setNavigationOverride: setNavigationOverride,
 181   };
 182
 183 });
 184
 185 document.addEventListener('DOMContentLoaded', uber_frame.onLoad);