dom-ui settings: display bubbles for sub-page search results....

chrome/browser/resources/options/search_page.js

 // Copyright (c) 2010 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;
 
   /**
+   * Encapsulated handling of a search bubble.
+   * @constructor
+   */
+  function SearchBubble(text) {
+    var el = cr.doc.createElement('div');
+    SearchBubble.decorate(el);
+    el.textContent = text;
+    return el;
+  }
+
+  SearchBubble.decorate = function(el) {
+    el.__proto__ = SearchBubble.prototype;
+    el.decorate();
+  };
+
+  SearchBubble.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    decorate: function() {
+      this.className = 'search-bubble';
+
+      // We create a timer to periodically update the position of the bubble.
+      // While this isn't all that desirable, it's the only sure-fire way of
+      // making sure the bubbles stay in the correct location as sections
+      // may dynamically change size at any time.
+      var self = this;
+      this.intervalId = setInterval(
+          function(e) { self.updatePosition(); }, 250);

[arv (Not doing code reviews), 2011/01/07 22:09:45]

setInterval(this.updatePosition.bind(this), 250);

[csilv, 2011/01/20 21:40:30]

Done.

+    },
+
+    /**
+     * Clear the interval timer and remove the element from the page.
+     */
+    dispose: function() {
+      clearInterval(this.intervalId);
+
+      var parent = this.parentNode;
+      if (parent)
+        parent.removeChild(this);
+    },
+
+    /**
+     * Update the position of the bubble.  Called at creation time and then
+     * periodically while the bubble remains visible.
+     */
+    updatePosition: function() {
+      // This bubble is 'owned' by the next sibling.
+      var owner = this.nextSibling;
+
+      // If there isn't an offset parent, we have nothing to do.
+      if (!owner.offsetParent)
+        return;
+
+      // Position the bubble below the location of the owner.
+      var left = Math.floor(owner.offsetLeft +

[arv (Not doing code reviews), 2011/01/07 22:09:45]

You can skip the floor here. left is not limited to integers

[csilv, 2011/01/20 21:40:30]

Done.

Coming from other platforms, I was concerned about blurry edges caused by
non-integer coordinates, but in a quick test it appears that the fraction will
be ignored.  That makes life easier.

+                            owner.offsetWidth/2 - this.offsetWidth/2);

[arv (Not doing code reviews), 2011/01/07 22:09:45]

ws around binops

[csilv, 2011/01/20 21:40:30]

Done.

+      var top = Math.floor(owner.offsetTop + owner.offsetHeight);
+
+      // Update the position in the CSS.  Cache the last values for
+      // best performance.

[arv (Not doing code reviews), 2011/01/07 22:09:45]

The main slowdown is the offset* followed by setting the style. One thing you
can do to improve this is to do the measuring of all bubbles first before you
set the style of them.

+      if (left != this.lastLeft) {
+        this.style.left = left + 'px';
+        this.lastLeft = left;
+      }
+      if (top != this.lastTop) {
+        this.style.top = top + 'px';
+        this.lastTop = top;
+      }
+    }
+  }
+
+  /**
    * Encapsulated handling of the search page.
    * @constructor
    */
   function SearchPage() {
     OptionsPage.call(this, 'search', templateData.searchPage, 'searchPage');
     this.searchActive = false;
   }
 
   cr.addSingletonGetter(SearchPage);
 
@@ skipping 103 matching lines @@
           }
         }
 
         if (active) {
           // When search is active, remove the 'hidden' tag.  This tag may have
           // been added by the OptionsPage.
           page.pageDiv.classList.remove('hidden');
         }
       }
 
-      // After hiding all page content, remove any highlighted matches.
-      if (!active)
+      // After hiding all page content, remove any search results.
+      if (!active) {
         this.unhighlightMatches_();
+        this.removeSearchBubbles_();
+      }
     },
 
     /**
      * Set the current search criteria.
      * @param {string} text Search text.
      * @private
      */
     setSearchText_: function(text) {
       var foundMatches = false;
+      var bubbleControls = [];
 
-      // Remove any highlighted matches.
+      // Remove any prior search results.
       this.unhighlightMatches_();
+      this.removeSearchBubbles_();
 
       // Generate search text by applying lowercase and escaping any characters
       // that would be problematic for regular expressions.
       var searchText =
           text.toLowerCase().replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
 
       // Generate a regular expression and replace string for hilighting
       // search terms.
       var regEx = new RegExp('(\\b' + searchText + ')', 'ig');
       var replaceString = '<span class="search-highlighted">$1</span>';
 
       // Initialize all sections.  If the search string matches a title page,
       // show sections for that page.
-      var page, pageMatch, childDiv;
+      var page, pageMatch, childDiv, length;
       var pagesToSearch = this.getSearchablePages_();
       for (var key in pagesToSearch) {
         page = pagesToSearch[key];
         pageMatch = false;
         if (searchText.length) {
           pageMatch = this.performReplace_(regEx, replaceString, page.tab);
         }
         if (pageMatch)
           foundMatches = true;
-        for (var i = 0; i < page.pageDiv.childNodes.length; i++) {
+        length = page.pageDiv.childNodes.length;

[arv (Not doing code reviews), 2011/01/07 22:09:45]

Change this to children and loop over the children instead so that you do not
have to check the nodeType

[csilv, 2011/01/20 21:40:30]

Done.

Thanks for pointing this out.  'children' appears to be rather poorly documented
(as far as I can find), but found it referenced on quirksmode.org.  Curious if
you have a good/complete reference to dom api that I should bookmark.

+        for (var i = 0; i < length; i++) {
           childDiv = page.pageDiv.childNodes[i];
           if (childDiv.nodeType == document.ELEMENT_NODE &&
               childDiv.nodeName == 'SECTION') {
             if (pageMatch) {
               childDiv.classList.remove('search-hidden');
             } else {
               childDiv.classList.add('search-hidden');
             }
           }
         }
       }
 
       if (searchText.length) {
+        // Search all top-level sections for anchored string matches.
+        for (var key in pagesToSearch) {
+          page = pagesToSearch[key];
+          length = page.pageDiv.childNodes.length;
+          for (var i = 0; i < length; i++) {
+            childDiv = page.pageDiv.childNodes[i];

[arv (Not doing code reviews), 2011/01/07 22:09:45]

children

[csilv, 2011/01/20 21:40:30]

Done.

+            if (childDiv.nodeType == document.ELEMENT_NODE &&
+                childDiv.nodeName == 'SECTION' &&
+                this.performReplace_(regEx, replaceString, childDiv)) {
+              childDiv.classList.remove('search-hidden');
+              foundMatches = true;
+            }
+          }
+        }
+
         // Search all sub-pages, generating an array of top-level sections that
         // we need to make visible.
         var subPagesToSearch = this.getSearchableSubPages_();
         var control, node;
         for (var key in subPagesToSearch) {
           page = subPagesToSearch[key];
           if (this.performReplace_(regEx, replaceString, page.pageDiv)) {
+            // Reveal the section for this search result.
             section = page.associatedSection;
             if (section)
               section.classList.remove('search-hidden');
-            controls = page.associatedControls;
+
+            // Identify any controls that should have bubbles.
+            var controls = page.associatedControls;
             if (controls) {
-              // TODO(csilv): highlight each control.
+              length = controls.length;
+              for (var i = 0; i < length; i++)
+                bubbleControls.push(controls[i]);
             }
 
             foundMatches = true;
           }
         }
-
-        // Search all top-level sections for anchored string matches.
-        for (var key in pagesToSearch) {
-          page = pagesToSearch[key];
-          for (var i = 0; i < page.pageDiv.childNodes.length; i++) {
-            childDiv = page.pageDiv.childNodes[i];
-            if (childDiv.nodeType == document.ELEMENT_NODE &&
-                childDiv.nodeName == 'SECTION' &&
-                this.performReplace_(regEx, replaceString, childDiv)) {
-              childDiv.classList.remove('search-hidden');
-              foundMatches = true;
-            }
-          }
-        }
       }
 
       // Configure elements on the search results page based on search results.
       if (searchText.length == 0) {
         $('searchPageInfo').classList.remove('search-hidden');
         $('searchPageNoMatches').classList.add('search-hidden');
       } else if (foundMatches) {
         $('searchPageInfo').classList.add('search-hidden');
         $('searchPageNoMatches').classList.add('search-hidden');
       } else {
         $('searchPageInfo').classList.add('search-hidden');
         $('searchPageNoMatches').classList.remove('search-hidden');
       }
+
+      // Create search balloons for sub-page results.
+      length = bubbleControls.length;
+      for (var i = 0; i < length; i++)
+        this.createSearchBubble_(bubbleControls[i], text);
     },
 
     /**
      * Performs a string replacement based on a regex and replace string.
      * @param {RegEx} regex A regular expression for finding search matches.
      * @param {String} replace A string to apply the replace operation.
      * @param {Element} element An HTML container element.
      * @returns {Boolean} true if the element was changed.
      * @private
      */
@@ skipping 56 matching lines @@
 
         // Replace the highlight element with the first child (the text node).
         parent.replaceChild(node.firstChild, node);
 
         // Normalize the parent so that multiple text nodes will be combined.
         parent.normalize();
       }
     },
 
     /**
+     * Creates a search result bubble attached to an element.
+     * @param {Element} element An HTML element, usually a button.
+     * @param {string} text A string to show in the bubble.
+     * @private
+     */
+    createSearchBubble_: function(element, text) {
+      // avoid appending multiple ballons to a button.
+      var sibling = element.previousSibling;
+      if (sibling && sibling.classList &&
+          sibling.classList.contains('search-bubble'))
+        return;
+
+      var parent = element.parentNode;
+      if (parent) {
+        var bubble = SearchBubble(text);
+        parent.insertBefore(bubble, element);
+        bubble.updatePosition();
+      }
+    },
+
+    /**
+     * Removes all search match bubbles.
+     * @private
+     */
+    removeSearchBubbles_: function() {
+      var elements = document.querySelectorAll('.search-bubble');
+      var length = elements.length;
+      for (var i = 0; i < length; i++)
+        elements[i].dispose();
+    },
+
+    /**
      * Builds a list of top-level pages to search.  Omits the search page and
      * all sub-pages.
      * @returns {Array} An array of pages to search.
      * @private
      */
     getSearchablePages_: function() {
       var name, page, pages = [];
       for (name in OptionsPage.registeredPages) {
         if (name != this.name) {
           page = OptionsPage.registeredPages[name];
@@ skipping 25 matching lines @@
       return pages;
     }
   };
 
   // Export
   return {
     SearchPage: SearchPage
   };
 
 });