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1 | /****************************** |
2 | * JavaScript for talk slides * |
3 | * by Robert Kaiser * |
4 | * <kairo@kairo.at> * |
5 | * (for FOSDEM 2011) * |
6 | ******************************/ |
7 | |
8 | var slides = {}; |
9 | var articleNodes; |
10 | var currentSlide; |
11 | var currentIdx; |
12 | var defaultIdx = 1; // set to slide index to show by default |
13 | var firstIdx = 2; // set no value if to use first available |
14 | var lastIdx; // set no value if to use first available |
15 | |
16 | var pageTitle, headerText, subHeaderText; |
17 | var navPrev, navNext, navPrevNolink, navNextNolink; |
18 | |
19 | // Slide timer - color variation of headerText |
20 | var slideSeconds = 3 * 60; |
21 | |
22 | // Called when the document has been loaded. |
23 | function docLoaded() { |
24 | pageTitle = document.getElementsByTagName("title")[0]; |
25 | headerText = document.getElementById("header-text"); |
26 | subHeaderText = document.getElementById("subheader-text"); |
27 | navPrev = document.getElementById("nav-prev"); |
28 | navNext = document.getElementById("nav-next"); |
29 | navPrevNolink = document.getElementById("nav-prev-nolink"); |
30 | navNextNolink = document.getElementById("nav-next-nolink"); |
31 | articleNodes = document.getElementsByTagName("article"); |
32 | |
33 | if (!firstIdx) |
34 | firstIdx = 0; |
35 | if (!lastIdx) |
36 | lastIdx = articleNodes.length - 1; |
37 | |
38 | // Get a list of all slides (articles). |
39 | subHeaderText.textContent = articleNodes.length + " slides..."; |
40 | for (var i = 0; i < articleNodes.length; ++i) { |
41 | subHeaderText.textContent = "Indexing slide " + i + " / " + articleNodes.length; |
42 | if (!articleNodes[i].id) |
43 | articleNodes[i].id = "slide_" + i; |
44 | |
45 | slides[articleNodes[i].id] = |
46 | {"idx": i, |
47 | "name": articleNodes[i].id, |
48 | "title": articleNodes[i].title ? articleNodes[i].title : articleNodes[i].id, |
49 | "obj": articleNodes[i]}; |
50 | |
51 | if (location.hash.length && |
52 | (location.hash == "#" + articleNodes[i].id || location.hash == "#" + i)) { |
53 | articleNodes[i].setAttribute("aria-selected", "true"); |
54 | currentSlide = slides[articleNodes[i].id]; |
55 | currentIdx = i; |
56 | } |
57 | } |
58 | |
59 | if (!currentSlide) { |
60 | currentIdx = defaultIdx; |
61 | currentSlide = slides[articleNodes[currentIdx].id]; |
62 | currentSlide.obj.setAttribute("aria-selected", "true"); |
63 | location.hash = "#" + currentSlide.name; |
64 | } |
65 | updateDisplay(); |
66 | } |
67 | |
68 | // Called when the hash part of the location changes. |
69 | function locationHashChanged() { |
70 | if (location.hash.length > 1) { |
71 | var hashtag = location.hash.substring(1); |
72 | // If not a number, treat as ID |
73 | if (isNaN(hashtag) && slides[hashtag]) { |
74 | currentSlide.obj.removeAttribute("aria-selected"); |
75 | currentSlide = slides[hashtag]; |
76 | currentIdx = currentSlide.idx; |
77 | currentSlide.obj.setAttribute("aria-selected", "true"); |
78 | updateDisplay(); |
79 | } |
80 | else if (articleNodes[hashtag]) { |
81 | currentSlide.obj.removeAttribute("aria-selected"); |
82 | currentIdx = hashtag; |
83 | currentSlide = slides[articleNodes[currentIdx].id]; |
84 | currentSlide.obj.setAttribute("aria-selected", "true"); |
85 | updateDisplay(); |
86 | } |
87 | } |
88 | } |
89 | window.onhashchange = locationHashChanged; |
90 | |
91 | // Update the display after we updated what slide is shown. |
92 | function updateDisplay() { |
93 | if (currentIdx >= firstIdx && currentIdx <= lastIdx && |
94 | currentSlide.name != "toc") |
95 | subHeaderText.textContent = (currentIdx - firstIdx + 1) + "/" + |
96 | (lastIdx - firstIdx + 1) + " - " + |
97 | currentSlide.title; |
98 | else |
99 | subHeaderText.textContent = currentSlide.title; |
100 | pageTitle.textContent = headerText.textContent + ": " + currentSlide.title; |
101 | if (currentIdx > firstIdx && currentSlide.name != "toc") { |
102 | navPrev.hidden = false; |
103 | navPrev.href = "#" + articleNodes[currentIdx - 1].id; |
104 | navPrevNolink.hidden = true; |
105 | } |
106 | else { |
107 | navPrev.hidden = true; |
108 | navPrevNolink.hidden = false; |
109 | } |
110 | if (currentIdx < lastIdx && currentSlide.name != "toc") { |
111 | navNext.hidden = false; |
112 | navNext.href = "#" + articleNodes[currentIdx + 1].id; |
113 | navNextNolink.hidden = true; |
114 | } |
115 | else { |
116 | navNext.hidden = true; |
117 | navNextNolink.hidden = false; |
118 | } |
119 | headerText.className = ""; |
120 | slideStart = new Date(); |
121 | if (currentSlide.name == "toc") |
122 | createTOC(); |
123 | else |
124 | setTimeout("timerFired()", timerMSec); |
125 | } |
126 | |
127 | // Create TOC list. |
128 | function createTOC() { |
129 | var list = document.getElementById("toc-list"); |
130 | if (!list.getElementsByTagName("li").length) { |
131 | for (var slide in slides) { |
132 | if (slide != "toc") { |
133 | var item = document.createElement("li"); |
134 | var link = document.createElement("a"); |
135 | var slideHeaders = slides[slide].obj.getElementsByTagName("h1"); |
136 | if (slideHeaders.length) |
137 | link.textContent = slideHeaders[0].textContent; |
138 | else |
139 | link.textContent = slides[slide].title; |
140 | link.href = "#" + slides[slide].name; |
141 | item.appendChild(link); |
142 | list.appendChild(item); |
143 | } |
144 | } |
145 | } |
146 | } |
147 | |
148 | // Do timed color variation on slides. |
149 | function timerFired() { |
150 | var slideCurrent = new Date(); |
151 | var secondsDiff = Math.round((slideCurrent.getTime() - slideStart.getTime()) / 1000); |
152 | if (secondsDiff >= slideSeconds) { |
153 | headerText.className = "overtime"; |
154 | } |
155 | else if (secondsDiff >= Math.round(2 * slideSeconds / 3)) { |
156 | headerText.className = "ontime"; |
157 | setTimeout("timerFired()", timerMSec); |
158 | } |
159 | else if (secondsDiff >= Math.round(slideSeconds / 3)) { |
160 | headerText.className = "neartime"; |
161 | setTimeout("timerFired()", timerMSec); |
162 | } |
163 | else { |
164 | // We should never come here, but if we do, go into a 100ms loop until we get over the upcoming step. |
165 | setTimeout("timerFired()", 100); |
166 | } |
167 | } |
168 | var slideStart = new Date(); |
169 | var timerMSec = 1000 * (slideSeconds / 3); |
170 | setTimeout("timerFired()", timerMSec); |
171 | |
172 | // Keyboard/click nav functionality, mostly inherited from FOSDEM 2007. |
173 | (function() { |
174 | function go(where) { |
175 | where = where || "next"; |
176 | var navElem = document.getElementById("nav-" + where); |
177 | if (!navElem.hidden) |
178 | window.location.href = navElem.href; |
179 | } |
180 | |
181 | function handleClick(e) { |
182 | e = e || event; |
183 | var target = (window.event) ? e.srcElement : e.target; |
184 | if (e.which == 1 && target.nodeName != "A" && target.nodeName != "VIDEO") |
185 | go("next"); |
186 | } |
187 | |
188 | function handleKeyPress(e) { |
189 | e = e || event; |
190 | switch (e.keyCode) { |
191 | case e.DOM_VK_LEFT: |
192 | go("prev"); break; |
193 | case e.DOM_VK_RIGHT: |
194 | go("next"); break; |
195 | } |
196 | } |
197 | |
198 | window.onclick = handleClick; |
199 | window.onkeypress = handleKeyPress; |
200 | })(); |