| 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 | // Up to 2/3 of that time, use "ontime" styling, then "neartime" until this is reached, "overtime" after that. |
| 21 | var slideSeconds = 2 * 60; |
| 22 | |
| 23 | // Called when the document has been loaded. |
| 24 | function docLoaded() { |
| 25 | pageTitle = document.getElementsByTagName("title")[0]; |
| 26 | headerText = document.getElementById("header-text"); |
| 27 | subHeaderText = document.getElementById("subheader-text"); |
| 28 | navPrev = document.getElementById("nav-prev"); |
| 29 | navNext = document.getElementById("nav-next"); |
| 30 | navPrevNolink = document.getElementById("nav-prev-nolink"); |
| 31 | navNextNolink = document.getElementById("nav-next-nolink"); |
| 32 | articleNodes = document.getElementsByTagName("article"); |
| 33 | |
| 34 | if (!firstIdx) |
| 35 | firstIdx = 0; |
| 36 | if (!lastIdx) |
| 37 | lastIdx = articleNodes.length - 1; |
| 38 | |
| 39 | // Get a list of all slides (articles). |
| 40 | subHeaderText.textContent = articleNodes.length + " slides..."; |
| 41 | for (var i = 0; i < articleNodes.length; ++i) { |
| 42 | subHeaderText.textContent = "Indexing slide " + i + " / " + articleNodes.length; |
| 43 | if (!articleNodes[i].id) |
| 44 | articleNodes[i].id = "slide_" + i; |
| 45 | |
| 46 | slides[articleNodes[i].id] = |
| 47 | {"idx": i, |
| 48 | "name": articleNodes[i].id, |
| 49 | "title": articleNodes[i].title ? articleNodes[i].title : articleNodes[i].id, |
| 50 | "obj": articleNodes[i]}; |
| 51 | |
| 52 | if (location.hash.length && |
| 53 | (location.hash == "#" + articleNodes[i].id || location.hash == "#" + i)) { |
| 54 | articleNodes[i].setAttribute("aria-selected", "true"); |
| 55 | currentSlide = slides[articleNodes[i].id]; |
| 56 | currentIdx = i; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | if (!currentSlide) { |
| 61 | currentIdx = defaultIdx; |
| 62 | currentSlide = slides[articleNodes[currentIdx].id]; |
| 63 | currentSlide.obj.setAttribute("aria-selected", "true"); |
| 64 | location.hash = "#" + currentSlide.name; |
| 65 | } |
| 66 | updateDisplay(); |
| 67 | } |
| 68 | |
| 69 | // Called when the hash part of the location changes. |
| 70 | function locationHashChanged() { |
| 71 | if (location.hash.length > 1) { |
| 72 | var hashtag = location.hash.substring(1); |
| 73 | // If not a number, treat as ID |
| 74 | if (isNaN(hashtag) && slides[hashtag]) { |
| 75 | currentSlide.obj.removeAttribute("aria-selected"); |
| 76 | currentSlide = slides[hashtag]; |
| 77 | currentIdx = currentSlide.idx; |
| 78 | currentSlide.obj.setAttribute("aria-selected", "true"); |
| 79 | updateDisplay(); |
| 80 | } |
| 81 | else if (articleNodes[hashtag]) { |
| 82 | currentSlide.obj.removeAttribute("aria-selected"); |
| 83 | currentIdx = hashtag; |
| 84 | currentSlide = slides[articleNodes[currentIdx].id]; |
| 85 | currentSlide.obj.setAttribute("aria-selected", "true"); |
| 86 | updateDisplay(); |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | window.onhashchange = locationHashChanged; |
| 91 | |
| 92 | // Update the display after we updated what slide is shown. |
| 93 | function updateDisplay() { |
| 94 | if (currentIdx >= firstIdx && currentIdx <= lastIdx && |
| 95 | currentSlide.name != "toc") |
| 96 | subHeaderText.textContent = (currentIdx - firstIdx + 1) + "/" + |
| 97 | (lastIdx - firstIdx + 1) + " - " + |
| 98 | currentSlide.title; |
| 99 | else |
| 100 | subHeaderText.textContent = currentSlide.title; |
| 101 | pageTitle.textContent = headerText.textContent + ": " + currentSlide.title; |
| 102 | if (currentIdx > firstIdx && currentSlide.name != "toc") { |
| 103 | navPrev.hidden = false; |
| 104 | navPrev.href = "#" + articleNodes[currentIdx - 1].id; |
| 105 | navPrevNolink.hidden = true; |
| 106 | } |
| 107 | else { |
| 108 | navPrev.hidden = true; |
| 109 | navPrevNolink.hidden = false; |
| 110 | } |
| 111 | if (currentIdx < lastIdx && currentSlide.name != "toc") { |
| 112 | navNext.hidden = false; |
| 113 | navNext.href = "#" + articleNodes[currentIdx + 1].id; |
| 114 | navNextNolink.hidden = true; |
| 115 | } |
| 116 | else { |
| 117 | navNext.hidden = true; |
| 118 | navNextNolink.hidden = false; |
| 119 | } |
| 120 | headerText.className = ""; |
| 121 | slideStart = new Date(); |
| 122 | if (currentSlide.name == "toc") |
| 123 | createTOC(); |
| 124 | else |
| 125 | setTimeout("timerFired()", timerMSec); |
| 126 | } |
| 127 | |
| 128 | // Create TOC list. |
| 129 | function createTOC() { |
| 130 | var list = document.getElementById("toc-list"); |
| 131 | if (!list.getElementsByTagName("li").length) { |
| 132 | for (var slide in slides) { |
| 133 | if (slide != "toc") { |
| 134 | var item = document.createElement("li"); |
| 135 | var link = document.createElement("a"); |
| 136 | var slideHeaders = slides[slide].obj.getElementsByTagName("h1"); |
| 137 | if (slideHeaders.length) |
| 138 | link.textContent = slideHeaders[0].textContent; |
| 139 | else |
| 140 | link.textContent = slides[slide].title; |
| 141 | link.href = "#" + slides[slide].name; |
| 142 | item.appendChild(link); |
| 143 | list.appendChild(item); |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | // Do timed color variation on slides. |
| 150 | function timerFired() { |
| 151 | var slideCurrent = new Date(); |
| 152 | var secondsDiff = Math.round((slideCurrent.getTime() - slideStart.getTime()) / 1000); |
| 153 | if (secondsDiff >= slideSeconds) { |
| 154 | headerText.className = "overtime"; |
| 155 | } |
| 156 | else if (secondsDiff >= Math.round(2 * slideSeconds / 3)) { |
| 157 | headerText.className = "ontime"; |
| 158 | setTimeout("timerFired()", timerMSec); |
| 159 | } |
| 160 | else if (secondsDiff >= Math.round(slideSeconds / 3)) { |
| 161 | headerText.className = "neartime"; |
| 162 | setTimeout("timerFired()", timerMSec); |
| 163 | } |
| 164 | else { |
| 165 | // We should never come here, but if we do, go into a 100ms loop until we get over the upcoming step. |
| 166 | setTimeout("timerFired()", 100); |
| 167 | } |
| 168 | } |
| 169 | var slideStart = new Date(); |
| 170 | var timerMSec = 1000 * (slideSeconds / 3); |
| 171 | setTimeout("timerFired()", timerMSec); |
| 172 | |
| 173 | // Keyboard/click nav functionality, mostly inherited from FOSDEM 2007. |
| 174 | (function() { |
| 175 | function go(where) { |
| 176 | where = where || "next"; |
| 177 | var navElem = document.getElementById("nav-" + where); |
| 178 | if (!navElem.hidden) |
| 179 | window.location.href = navElem.href; |
| 180 | } |
| 181 | |
| 182 | function handleClick(e) { |
| 183 | e = e || event; |
| 184 | var target = (window.event) ? e.srcElement : e.target; |
| 185 | if (e.which == 1 && target.nodeName != "A" && target.nodeName != "VIDEO") |
| 186 | go("next"); |
| 187 | } |
| 188 | |
| 189 | function handleKeyPress(e) { |
| 190 | e = e || event; |
| 191 | switch (e.keyCode) { |
| 192 | // See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode#Constants_for_keyCode_value |
| 193 | case e.DOM_VK_LEFT: |
| 194 | case e.DOM_VK_DOWN: |
| 195 | case e.DOM_VK_PAGE_DOWN: |
| 196 | case e.DOM_VK_H: //8bitdo Zero "X" |
| 197 | go("prev"); break; |
| 198 | case e.DOM_VK_RIGHT: |
| 199 | case e.DOM_VK_UP: |
| 200 | case e.DOM_VK_PAGE_UP: |
| 201 | case e.DOM_VK_J: //8bitdo Zero "B" |
| 202 | go("next"); break; |
| 203 | case e.DOM_VK_HOME: |
| 204 | go("start"); break; |
| 205 | case e.DOM_VK_END: |
| 206 | go("toc"); break; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | window.onclick = handleClick; |
| 211 | window.onkeypress = handleKeyPress; |
| 212 | })(); |