+/******************************
+ * JavaScript for talk slides *
+ * by Robert Kaiser *
+ * <kairo@kairo.at> *
+ * (for FOSDEM 2011) *
+ ******************************/
+
+var slides = {};
+var articleNodes;
+var currentSlide;
+var currentIdx;
+var defaultIdx = 1; // set to slide index to show by default
+var firstIdx = 2; // set no value if to use first available
+var lastIdx; // set no value if to use first available
+
+var pageTitle, headerText, subHeaderText;
+var navPrev, navNext, navPrevNolink, navNextNolink;
+
+// Slide timer - color variation of headerText
+var slideSeconds = 2 * 60;
+
+// Called when the document has been loaded.
+function docLoaded() {
+ pageTitle = document.getElementsByTagName("title")[0];
+ headerText = document.getElementById("header-text");
+ subHeaderText = document.getElementById("subheader-text");
+ navPrev = document.getElementById("nav-prev");
+ navNext = document.getElementById("nav-next");
+ navPrevNolink = document.getElementById("nav-prev-nolink");
+ navNextNolink = document.getElementById("nav-next-nolink");
+ articleNodes = document.getElementsByTagName("article");
+
+ if (!firstIdx)
+ firstIdx = 0;
+ if (!lastIdx)
+ lastIdx = articleNodes.length - 1;
+
+ // Get a list of all slides (articles).
+ subHeaderText.textContent = articleNodes.length + " slides...";
+ for (var i = 0; i < articleNodes.length; ++i) {
+ subHeaderText.textContent = "Indexing slide " + i + " / " + articleNodes.length;
+ if (!articleNodes[i].id)
+ articleNodes[i].id = "slide_" + i;
+
+ slides[articleNodes[i].id] =
+ {"idx": i,
+ "name": articleNodes[i].id,
+ "title": articleNodes[i].title ? articleNodes[i].title : articleNodes[i].id,
+ "obj": articleNodes[i]};
+
+ if (location.hash.length &&
+ (location.hash == "#" + articleNodes[i].id || location.hash == "#" + i)) {
+ articleNodes[i].setAttribute("aria-selected", "true");
+ currentSlide = slides[articleNodes[i].id];
+ currentIdx = i;
+ }
+ }
+
+ if (!currentSlide) {
+ currentIdx = defaultIdx;
+ currentSlide = slides[articleNodes[currentIdx].id];
+ currentSlide.obj.setAttribute("aria-selected", "true");
+ location.hash = "#" + currentSlide.name;
+ }
+ updateDisplay();
+}
+
+// Called when the hash part of the location changes.
+function locationHashChanged() {
+ if (location.hash.length > 1) {
+ var hashtag = location.hash.substring(1);
+ // If not a number, treat as ID
+ if (isNaN(hashtag) && slides[hashtag]) {
+ currentSlide.obj.removeAttribute("aria-selected");
+ currentSlide = slides[hashtag];
+ currentIdx = currentSlide.idx;
+ currentSlide.obj.setAttribute("aria-selected", "true");
+ updateDisplay();
+ }
+ else if (articleNodes[hashtag]) {
+ currentSlide.obj.removeAttribute("aria-selected");
+ currentIdx = hashtag;
+ currentSlide = slides[articleNodes[currentIdx].id];
+ currentSlide.obj.setAttribute("aria-selected", "true");
+ updateDisplay();
+ }
+ }
+}
+window.onhashchange = locationHashChanged;
+
+// Update the display after we updated what slide is shown.
+function updateDisplay() {
+ if (currentIdx >= firstIdx && currentIdx <= lastIdx &&
+ currentSlide.name != "toc")
+ subHeaderText.textContent = (currentIdx - firstIdx + 1) + "/" +
+ (lastIdx - firstIdx + 1) + " - " +
+ currentSlide.title;
+ else
+ subHeaderText.textContent = currentSlide.title;
+ pageTitle.textContent = headerText.textContent + ": " + currentSlide.title;
+ if (currentIdx > firstIdx && currentSlide.name != "toc") {
+ navPrev.hidden = false;
+ navPrev.href = "#" + articleNodes[currentIdx - 1].id;
+ navPrevNolink.hidden = true;
+ }
+ else {
+ navPrev.hidden = true;
+ navPrevNolink.hidden = false;
+ }
+ if (currentIdx < lastIdx && currentSlide.name != "toc") {
+ navNext.hidden = false;
+ navNext.href = "#" + articleNodes[currentIdx + 1].id;
+ navNextNolink.hidden = true;
+ }
+ else {
+ navNext.hidden = true;
+ navNextNolink.hidden = false;
+ }
+ headerText.className = "";
+ slideStart = new Date();
+ if (currentSlide.name == "toc")
+ createTOC();
+ else
+ setTimeout("timerFired()", timerMSec);
+}
+
+// Create TOC list.
+function createTOC() {
+ var list = document.getElementById("toc-list");
+ if (!list.getElementsByTagName("li").length) {
+ for (var slide in slides) {
+ if (slide != "toc") {
+ var item = document.createElement("li");
+ var link = document.createElement("a");
+ var slideHeaders = slides[slide].obj.getElementsByTagName("h1");
+ if (slideHeaders.length)
+ link.textContent = slideHeaders[0].textContent;
+ else
+ link.textContent = slides[slide].title;
+ link.href = "#" + slides[slide].name;
+ item.appendChild(link);
+ list.appendChild(item);
+ }
+ }
+ }
+}
+
+// Do timed color variation on slides.
+function timerFired() {
+ var slideCurrent = new Date();
+ var secondsDiff = Math.round((slideCurrent.getTime() - slideStart.getTime()) / 1000);
+ if (secondsDiff >= slideSeconds) {
+ headerText.className = "overtime";
+ }
+ else if (secondsDiff >= Math.round(2 * slideSeconds / 3)) {
+ headerText.className = "ontime";
+ setTimeout("timerFired()", timerMSec);
+ }
+ else if (secondsDiff >= Math.round(slideSeconds / 3)) {
+ headerText.className = "neartime";
+ setTimeout("timerFired()", timerMSec);
+ }
+ else {
+ // We should never come here, but if we do, go into a 100ms loop until we get over the upcoming step.
+ setTimeout("timerFired()", 100);
+ }
+}
+var slideStart = new Date();
+var timerMSec = 1000 * (slideSeconds / 3);
+setTimeout("timerFired()", timerMSec);
+
+// Keyboard/click nav functionality, mostly inherited from FOSDEM 2007.
+(function() {
+ function go(where) {
+ where = where || "next";
+ var navElem = document.getElementById("nav-" + where);
+ if (!navElem.hidden)
+ window.location.href = navElem.href;
+ }
+
+ function handleClick(e) {
+ e = e || event;
+ var target = (window.event) ? e.srcElement : e.target;
+ if (e.which == 1 && target.nodeName != "A" && target.nodeName != "VIDEO")
+ go("next");
+ }
+
+ function handleKeyPress(e) {
+ e = e || event;
+ switch (e.keyCode) {
+ case e.DOM_VK_LEFT:
+ go("prev"); break;
+ case e.DOM_VK_RIGHT:
+ go("next"); break;
+ }
+ }
+
+ window.onclick = handleClick;
+ window.onkeypress = handleKeyPress;
+})();
projects / slides.git / commitdiff
