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/*
Google HTML5 slides template
Authors: Luke Mahé (code)
Marcin Wichary (code and design)
Dominic Mazzoni (browser compatibility)
Charles Chen (ChromeVox support)
URL: http://code.google.com/p/html5slides/
*/
var PERMANENT_URL_PREFIX = ''; // 'http://html5slides.googlecode.com/svn/trunk/';
var SLIDE_CLASSES = ['far-past', 'past', 'current', 'next', 'far-next'];
var PM_TOUCH_SENSITIVITY = 15;
var curSlide;
/* ---------------------------------------------------------------------- */
/* classList polyfill by Eli Grey
* (http://purl.eligrey.com/github/classList.js/blob/master/classList.js) */
if (typeof document !== "undefined" && !("classList" in document.createElement("a"))) {
(function (view) {
var
classListProp = "classList"
, protoProp = "prototype"
, elemCtrProto = (view.HTMLElement || view.Element)[protoProp]
, objCtr = Object
strTrim = String[protoProp].trim || function () {
return this.replace(/^\s+|\s+$/g, "");
}
, arrIndexOf = Array[protoProp].indexOf || function (item) {
for (var i = 0, len = this.length; i < len; i++) {
if (i in this && this[i] === item) {
return i;
}
}
return -1;
}
// Vendors: please allow content code to instantiate DOMExceptions
, DOMEx = function (type, message) {
this.name = type;
this.code = DOMException[type];
this.message = message;
}
, checkTokenAndGetIndex = function (classList, token) {
if (token === "") {
throw new DOMEx(
"SYNTAX_ERR"
, "An invalid or illegal string was specified"
);
}
if (/\s/.test(token)) {
throw new DOMEx(
"INVALID_CHARACTER_ERR"
, "String contains an invalid character"
);
}
return arrIndexOf.call(classList, token);
}
, ClassList = function (elem) {
var
trimmedClasses = strTrim.call(elem.className)
, classes = trimmedClasses ? trimmedClasses.split(/\s+/) : []
;
for (var i = 0, len = classes.length; i < len; i++) {
this.push(classes[i]);
}
this._updateClassName = function () {
elem.className = this.toString();
};
}
, classListProto = ClassList[protoProp] = []
, classListGetter = function () {
return new ClassList(this);
}
;
// Most DOMException implementations don't allow calling DOMException's toString()
// on non-DOMExceptions. Error's toString() is sufficient here.
DOMEx[protoProp] = Error[protoProp];
classListProto.item = function (i) {
return this[i] || null;
};
classListProto.contains = function (token) {
token += "";
return checkTokenAndGetIndex(this, token) !== -1;
};
classListProto.add = function (token) {
token += "";
if (checkTokenAndGetIndex(this, token) === -1) {
this.push(token);
this._updateClassName();
}
};
classListProto.remove = function (token) {
token += "";
var index = checkTokenAndGetIndex(this, token);
if (index !== -1) {
this.splice(index, 1);
this._updateClassName();
}
};
classListProto.toggle = function (token) {
token += "";
if (checkTokenAndGetIndex(this, token) === -1) {
this.add(token);
} else {
this.remove(token);
}
};
classListProto.toString = function () {
return this.join(" ");
};
if (objCtr.defineProperty) {
var classListPropDesc = {
get: classListGetter
, enumerable: true
, configurable: true
};
try {
objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
} catch (ex) { // IE 8 doesn't support enumerable:true
if (ex.number === -0x7FF5EC54) {
classListPropDesc.enumerable = false;
objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
}
}
} else if (objCtr[protoProp].__defineGetter__) {
elemCtrProto.__defineGetter__(classListProp, classListGetter);
}
}(self));
}
/* ---------------------------------------------------------------------- */
/* Slide movement */
function getSlideEl(no) {
if ((no < 0) || (no >= slideEls.length)) {
return null;
} else {
return slideEls[no];
}
};
function updateSlideClass(slideNo, className) {
var el = getSlideEl(slideNo);
if (!el) {
return;
}
if (className) {
el.classList.add(className);
}
for (var i in SLIDE_CLASSES) {
if (className != SLIDE_CLASSES[i]) {
el.classList.remove(SLIDE_CLASSES[i]);
}
}
};
function updateSlides() {
for (var i = 0; i < slideEls.length; i++) {
switch (i) {
case curSlide - 2:
updateSlideClass(i, 'far-past');
break;
case curSlide - 1:
updateSlideClass(i, 'past');
break;
case curSlide:
updateSlideClass(i, 'current');
break;
case curSlide + 1:
updateSlideClass(i, 'next');
break;
case curSlide + 2:
updateSlideClass(i, 'far-next');
break;
default:
updateSlideClass(i);
break;
}
}
triggerLeaveEvent(curSlide - 1);
triggerEnterEvent(curSlide);
window.setTimeout(function() {
// Hide after the slide
disableSlideFrames(curSlide - 2);
}, 301);
enableSlideFrames(curSlide - 1);
enableSlideFrames(curSlide + 2);
if (isChromeVoxActive()) {
speakAndSyncToNode(slideEls[curSlide]);
}
updateHash();
};
function buildNextItem() {
var toBuild = slideEls[curSlide].querySelectorAll('.to-build');
if (!toBuild.length) {
return false;
}
toBuild[0].classList.remove('to-build', '');
if (isChromeVoxActive()) {
speakAndSyncToNode(toBuild[0]);
}
return true;
};
function prevSlide() {
if (curSlide > 0) {
curSlide--;
updateSlides();
}
};
function nextSlide() {
if (buildNextItem()) {
return;
}
if (curSlide < slideEls.length - 1) {
curSlide++;
updateSlides();
}
};
/* Slide events */
function triggerEnterEvent(no) {
var el = getSlideEl(no);
if (!el) {
return;
}
var onEnter = el.getAttribute('onslideenter');
if (onEnter) {
new Function(onEnter).call(el);
}
var evt = document.createEvent('Event');
evt.initEvent('slideenter', true, true);
evt.slideNumber = no + 1; // Make it readable
el.dispatchEvent(evt);
};
function triggerLeaveEvent(no) {
var el = getSlideEl(no);
if (!el) {
return;
}
var onLeave = el.getAttribute('onslideleave');
if (onLeave) {
new Function(onLeave).call(el);
}
var evt = document.createEvent('Event');
evt.initEvent('slideleave', true, true);
evt.slideNumber = no + 1; // Make it readable
el.dispatchEvent(evt);
};
/* Touch events */
function handleTouchStart(event) {
if (event.touches.length == 1) {
touchDX = 0;
touchDY = 0;
touchStartX = event.touches[0].pageX;
touchStartY = event.touches[0].pageY;
document.body.addEventListener('touchmove', handleTouchMove, true);
document.body.addEventListener('touchend', handleTouchEnd, true);
}
};
function handleTouchMove(event) {
if (event.touches.length > 1) {
cancelTouch();
} else {
touchDX = event.touches[0].pageX - touchStartX;
touchDY = event.touches[0].pageY - touchStartY;
}
};
function handleTouchEnd(event) {
var dx = Math.abs(touchDX);
var dy = Math.abs(touchDY);
if ((dx > PM_TOUCH_SENSITIVITY) && (dy < (dx * 2 / 3))) {
if (touchDX > 0) {
prevSlide();
} else {
nextSlide();
}
}
cancelTouch();
};
function cancelTouch() {
document.body.removeEventListener('touchmove', handleTouchMove, true);
document.body.removeEventListener('touchend', handleTouchEnd, true);
};
/* Preloading frames */
function disableSlideFrames(no) {
var el = getSlideEl(no);
if (!el) {
return;
}
var frames = el.getElementsByTagName('iframe');
for (var i = 0, frame; frame = frames[i]; i++) {
disableFrame(frame);
}
};
function enableSlideFrames(no) {
var el = getSlideEl(no);
if (!el) {
return;
}
var frames = el.getElementsByTagName('iframe');
for (var i = 0, frame; frame = frames[i]; i++) {
enableFrame(frame);
}
};
function disableFrame(frame) {
frame.src = 'about:blank';
};
function enableFrame(frame) {
var src = frame._src;
if (frame.src != src && src != 'about:blank') {
frame.src = src;
}
};
function setupFrames() {
var frames = document.querySelectorAll('iframe');
for (var i = 0, frame; frame = frames[i]; i++) {
frame._src = frame.src;
disableFrame(frame);
}
enableSlideFrames(curSlide);
enableSlideFrames(curSlide + 1);
enableSlideFrames(curSlide + 2);
};
function setupInteraction() {
/* Clicking and tapping */
var el = document.createElement('div');
el.className = 'slide-area';
el.id = 'prev-slide-area';
el.addEventListener('click', prevSlide, false);
document.querySelector('section.slides').appendChild(el);
var el = document.createElement('div');
el.className = 'slide-area';
el.id = 'next-slide-area';
el.addEventListener('click', nextSlide, false);
document.querySelector('section.slides').appendChild(el);
/* Swiping */
document.body.addEventListener('touchstart', handleTouchStart, false);
}
/* ChromeVox support */
function isChromeVoxActive() {
if (typeof(cvox) == 'undefined') {
return false;
} else {
return true;
}
};
function speakAndSyncToNode(node) {
if (!isChromeVoxActive()) {
return;
}
cvox.ChromeVox.navigationManager.switchToStrategy(
cvox.ChromeVoxNavigationManager.STRATEGIES.LINEARDOM, 0, true);
cvox.ChromeVox.navigationManager.syncToNode(node);
cvox.ChromeVoxUserCommands.finishNavCommand('');
var target = node;
while (target.firstChild) {
target = target.firstChild;
}
cvox.ChromeVox.navigationManager.syncToNode(target);
};
function speakNextItem() {
if (!isChromeVoxActive()) {
return;
}
cvox.ChromeVox.navigationManager.switchToStrategy(
cvox.ChromeVoxNavigationManager.STRATEGIES.LINEARDOM, 0, true);
cvox.ChromeVox.navigationManager.next(true);
if (!cvox.DomUtil.isDescendantOfNode(
cvox.ChromeVox.navigationManager.getCurrentNode(), slideEls[curSlide])){
var target = slideEls[curSlide];
while (target.firstChild) {
target = target.firstChild;
}
cvox.ChromeVox.navigationManager.syncToNode(target);
cvox.ChromeVox.navigationManager.next(true);
}
cvox.ChromeVoxUserCommands.finishNavCommand('');
};
function speakPrevItem() {
if (!isChromeVoxActive()) {
return;
}
cvox.ChromeVox.navigationManager.switchToStrategy(
cvox.ChromeVoxNavigationManager.STRATEGIES.LINEARDOM, 0, true);
cvox.ChromeVox.navigationManager.previous(true);
if (!cvox.DomUtil.isDescendantOfNode(
cvox.ChromeVox.navigationManager.getCurrentNode(), slideEls[curSlide])){
var target = slideEls[curSlide];
while (target.lastChild){
target = target.lastChild;
}
cvox.ChromeVox.navigationManager.syncToNode(target);
cvox.ChromeVox.navigationManager.previous(true);
}
cvox.ChromeVoxUserCommands.finishNavCommand('');
};
/* Hash functions */
function getCurSlideFromHash() {
var slideNo = parseInt(location.hash.substr(1));
if (slideNo) {
curSlide = slideNo - 1;
} else {
curSlide = 0;
}
};
function updateHash() {
location.replace('#' + (curSlide + 1));
};
/* Event listeners */
function handleBodyKeyDown(event) {
switch (event.keyCode) {
case 39: // right arrow
case 13: // Enter
case 32: // space
case 34: // PgDn
nextSlide();
event.preventDefault();
break;
case 37: // left arrow
case 8: // Backspace
case 33: // PgUp
prevSlide();
event.preventDefault();
break;
case 40: // down arrow
if (isChromeVoxActive()) {
speakNextItem();
} else {
nextSlide();
}
event.preventDefault();
break;
case 38: // up arrow
if (isChromeVoxActive()) {
speakPrevItem();
} else {
prevSlide();
}
event.preventDefault();
break;
}
};
function addEventListeners() {
document.addEventListener('keydown', handleBodyKeyDown, false);
};
/* Initialization */
function addPrettify() {
var els = document.querySelectorAll('pre');
for (var i = 0, el; el = els[i]; i++) {
if (!el.classList.contains('noprettyprint')) {
el.classList.add('prettyprint');
}
}
var el = document.createElement('script');
el.type = 'text/javascript';
el.src = PERMANENT_URL_PREFIX + 'prettify.js';
el.onload = function() {
prettyPrint();
}
document.body.appendChild(el);
};
function addFontStyle() {
var el = document.createElement('link');
el.rel = 'stylesheet';
el.type = 'text/css';
el.href = 'fonts.css';
document.body.appendChild(el);
};
function addGeneralStyle() {
var el = document.createElement('link');
el.rel = 'stylesheet';
el.type = 'text/css';
el.href = PERMANENT_URL_PREFIX + 'styles.css';
document.body.appendChild(el);
var el = document.createElement('meta');
el.name = 'viewport';
el.content = 'width=1100,height=750';
document.querySelector('head').appendChild(el);
var el = document.createElement('meta');
el.name = 'apple-mobile-web-app-capable';
el.content = 'yes';
document.querySelector('head').appendChild(el);
};
function makeBuildLists() {
for (var i = curSlide, slide; slide = slideEls[i]; i++) {
var items = slide.querySelectorAll('.build > *');
for (var j = 0, item; item = items[j]; j++) {
if (item.classList) {
item.classList.add('to-build');
}
}
}
};
function handleDomLoaded() {
slideEls = document.querySelectorAll('section.slides > article');
setupFrames();
addFontStyle();
addGeneralStyle();
addPrettify();
addEventListeners();
updateSlides();
setupInteraction();
makeBuildLists();
document.body.classList.add('loaded');
};
function initialize() {
getCurSlideFromHash();
if (window['_DEBUG']) {
// PERMANENT_URL_PREFIX = '../';
}
if (window['_DCL']) {
handleDomLoaded();
} else {
document.addEventListener('DOMContentLoaded', handleDomLoaded, false);
}
}
// If ?debug exists then load the script relative instead of absolute
if (!window['_DEBUG'] && document.location.href.indexOf('?debug') !== -1) {
document.addEventListener('DOMContentLoaded', function() {
// Avoid missing the DomContentLoaded event
window['_DCL'] = true
}, false);
window['_DEBUG'] = true;
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = '../slides.js';
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(script, s);
// Remove this script
s.parentNode.removeChild(s);
} else {
initialize();
}
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