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1/*
2 * Copyright 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17$(document).ready(function() {
18  prettyPrint();
19
20  var sluggify_ = function(s) {
21    return (s || '').replace(/ /g, '-').replace(/[^\w-]/g, '').toLowerCase();
22  };
23
24  $('h2, h3, h4.includetoc').each(function() {
25    $(this).attr('id', 'toc_' + sluggify_($(this).data('toctitle') || $(this).text()));
26    $(this).click(function() {
27      smoothScrollToId($(this).attr('id'));
28    });
29  });
30
31  var buildNav_ = function(queries, $contentRoot, $navRoot) {
32    if (!queries || !queries.length) {
33      return;
34    }
35
36    $contentRoot.find(queries[0]).each(function() {
37      var $navNode = $('<div>')
38          .text($(this).html())
39          .appendTo($navRoot);
40      buildNav_(queries.splice(1), $(this), $navNode);
41    });
42  };
43
44  buildNav();
45});
46
47function buildNav() {
48  var currentLevel = 2;
49  var $currentParent = $('nav');
50  var $currentNode = null;
51
52  $('#page-content').find('h2, h3, h4.includetoc').each(function() {
53    var level = $(this).get(0).tagName.substring(1);
54
55    if (level < currentLevel) {
56      // ascend
57      for (var i = 0; i < (currentLevel - level); i++) {
58        $currentParent = $currentParent.parents('div.children, nav').first();
59      }
60
61    } else if (level > currentLevel) {
62      // descend
63      $currentParent = $('<div>')
64          .addClass('children')
65          .appendTo($currentNode);
66    }
67
68    var tocId = $(this).attr('id');
69    var navId = tocId.replace(/toc_/, 'nav_');
70
71    $interactionNode = $('<span>')
72        .html($(this).data('toctitle') || $(this).html())
73        .data('target', tocId)
74        .click(function() {
75          smoothScrollToId($(this).data('target'));
76        });
77
78    $currentNode = $('<div>')
79        .attr('id', navId)
80        .addClass('item')
81        .append($interactionNode)
82        .appendTo($currentParent);
83
84    currentLevel = level;
85  });
86
87  var headerPositionCache = [];
88  var rebuildHeaderPositionCache_ = function() {
89    headerPositionCache = [];
90    $('#page-content').find('h2, h3, h4.includetoc').each(function() {
91      headerPositionCache.push({
92        id: $(this).attr('id').replace(/toc_/, 'nav_'),
93        top: $(this).offset().top
94      });
95    });
96  };
97
98  var updateSelectedNavPosition_ = function() {
99    $('nav .item').removeClass('selected');
100    var scrollTop = $(window).scrollTop();
101    for (var i = headerPositionCache.length - 1; i >= 0; i--) {
102      if (scrollTop >= headerPositionCache[i].top) {
103        $('#' + headerPositionCache[i].id).addClass('selected');
104        console.log($('#' + headerPositionCache[i].id));
105        break;
106      }
107    }
108  };
109
110  rebuildHeaderPositionCache_();
111  $(window).resize(function() {
112    rebuildHeaderPositionCache_();
113    updateSelectedNavPosition_();
114  });
115
116  $(window).scroll(function() {
117    updateSelectedNavPosition_();
118  });
119}
120
121function smoothScrollToId(id) {
122  var $target = $('#' + id);
123  $('body').animate({ scrollTop: $target.offset().top }, 200, 'swing', function() {
124    document.location.hash = id;
125  });
126}
127