X-Git-Url: https://git-public.kairo.at/?p=slides.git;a=blobdiff_plain;f=fhwn201810%2Fslides.js;fp=fhwn201810%2Fslides.js;h=20a4890d11f6d857a796d59ea35361f893f304e0;hp=0000000000000000000000000000000000000000;hb=48498de81ed84f6ebb27c7631dac3ef67f2735ac;hpb=7c8bf335369c2a6a826c7fb51ac2966e8cbaece6

diff --git a/fhwn201810/slides.js b/fhwn201810/slides.js
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+/******************************
+ * 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 last available
+
+var pageTitle, headerText, subHeaderText;
+var navPrev, navNext, navPrevNolink, navNextNolink;
+
+// Slide timer - color variation of headerText
+// Time per slide is total presentation length divided by number of slides
+// except start and end slide.
+var presLengthSeconds = 15 * 60;
+var slideStart, timerMSec;
+
+// 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;
+  var slideSeconds = presLengthSeconds / (lastIdx - firstIdx);
+  timerMSec = 1000 * (slideSeconds / 3);
+
+  // 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].dataset.title ? articleNodes[i].dataset.title : articleNodes[i].id,
+        "obj": articleNodes[i],
+        "timeSeconds": articleNodes[i].dataset.seconds ? articleNodes[i].dataset.seconds : slideSeconds,
+    };
+
+    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();
+  timerMSec = 1000 * (currentSlide.timeSeconds / 3);
+  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 >= currentSlide.timeSeconds) {
+    headerText.className = "overtime";
+  }
+  else if (secondsDiff >= Math.round(2 * currentSlide.timeSeconds / 3)) {
+    headerText.className = "ontime";
+    setTimeout(timerFired, timerMSec);
+  }
+  else if (secondsDiff >= Math.round(currentSlide.timeSeconds / 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);
+  }
+}
+
+// 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.key) {
+      // See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode#Constants_for_keyCode_value
+      case "ArrowLeft":
+      case "ArrowDown":
+      case "Left": // non-standard, old browsers
+      case "Down": // non-standard, old browsers
+      case "PageDown":
+      case "P":
+      case "p":
+      case "H": //8bitdo Zero "X"
+      case "h": //8bitdo Zero "X"
+        go("prev"); break;
+      case "ArrowRight":
+      case "ArrowUp":
+      case "Right": // non-standard, old browsers
+      case "Up": // non-standard, old browsers
+      case "PageUp":
+      case "N":
+      case "n":
+      case "J": //8bitdo Zero "B"
+      case "j": //8bitdo Zero "B"
+        go("next"); break;
+      case "Home":
+      case "I": //8bitdo Zero "Y"
+      case "i": //8bitdo Zero "Y"
+        go("start"); break;
+      case "End":
+      case "G": //8bitdo Zero "A"
+      case "g": //8bitdo Zero "A"
+        go("toc"); break;
+    }
+  }
+
+  window.onclick = handleClick;
+  window.onkeydown = handleKeyPress;
+})();