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/** * impress.js * * impress.js is a presentation tool based on the power of CSS3 transforms and transitions * in modern browsers and inspired by the idea behind prezi.com. * * * Copyright 2011-2012 Bartek Szopka (@bartaz) * * Released under the MIT and GPL Licenses. * * ------------------------------------------------ * author: Bartek Szopka * version: 0.5.2 * url: http://bartaz.github.com/impress.js/ * source: http://github.com/bartaz/impress.js/ */ /*jshint bitwise:true, curly:true, eqeqeq:true, forin:true, latedef:true, newcap:true, noarg:true, noempty:true, undef:true, strict:true, browser:true */ // You are one of those who like to know how thing work inside? // Let me show you the cogs that make impress.js run... (function ( document, window ) { 'use strict'; // HELPER FUNCTIONS // `pfx` is a function that takes a standard CSS property name as a parameter // and returns it's prefixed version valid for current browser it runs in. // The code is heavily inspired by Modernizr http://www.modernizr.com/ var pfx = (function () { var style = document.createElement('dummy').style, prefixes = 'Webkit Moz O ms Khtml'.split(' '), memory = {}; return function ( prop ) { if ( typeof memory[ prop ] === "undefined" ) { var ucProp = prop.charAt(0).toUpperCase() + prop.substr(1), props = (prop + ' ' + prefixes.join(ucProp + ' ') + ucProp).split(' '); memory[ prop ] = null; for ( var i in props ) { if ( style[ props[i] ] !== undefined ) { memory[ prop ] = props[i]; break; } } } return memory[ prop ]; }; })(); // `arraify` takes an array-like object and turns it into real Array // to make all the Array.prototype goodness available. var arrayify = function ( a ) { return [].slice.call( a ); }; // `css` function applies the styles given in `props` object to the element // given as `el`. It runs all property names through `pfx` function to make // sure proper prefixed version of the property is used. var css = function ( el, props ) { var key, pkey; for ( key in props ) { if ( props.hasOwnProperty(key) ) { pkey = pfx(key); if ( pkey !== null ) { el.style[pkey] = props[key]; } } } return el; }; // `toNumber` takes a value given as `numeric` parameter and tries to turn // it into a number. If it is not possible it returns 0 (or other value // given as `fallback`). var toNumber = function (numeric, fallback) { return isNaN(numeric) ? (fallback || 0) : Number(numeric); }; // `byId` returns element with given `id` - you probably have guessed that ;) var byId = function ( id ) { return document.getElementById(id); }; // `$` returns first element for given CSS `selector` in the `context` of // the given element or whole document. var $ = function ( selector, context ) { context = context || document; return context.querySelector(selector); }; // `$$` return an array of elements for given CSS `selector` in the `context` of // the given element or whole document. var $$ = function ( selector, context ) { context = context || document; return arrayify( context.querySelectorAll(selector) ); }; // `triggerEvent` builds a custom DOM event with given `eventName` and `detail` data // and triggers it on element given as `el`. var triggerEvent = function (el, eventName, detail) { var event = document.createEvent("CustomEvent"); event.initCustomEvent(eventName, true, true, detail); el.dispatchEvent(event); }; // `translate` builds a translate transform string for given data. var translate = function ( t ) { return " translate3d(" + t.x + "px," + t.y + "px," + t.z + "px) "; }; // `rotate` builds a rotate transform string for given data. // By default the rotations are in X Y Z order that can be reverted by passing `true` // as second parameter. var rotate = function ( r, revert ) { var rX = " rotateX(" + r.x + "deg) ", rY = " rotateY(" + r.y + "deg) ", rZ = " rotateZ(" + r.z + "deg) "; return revert ? rZ+rY+rX : rX+rY+rZ; }; // `scale` builds a scale transform string for given data. var scale = function ( s ) { return " scale(" + s + ") "; }; // `perspective` builds a perspective transform string for given data. var perspective = function ( p ) { return " perspective(" + p + "px) "; }; // `getElementFromHash` returns an element located by id from hash part of // window location. var getElementFromHash = function () { // get id from url # by removing `#` or `#/` from the beginning, // so both "fallback" `#slide-id` and "enhanced" `#/slide-id` will work return byId( window.location.hash.replace(/^#\/?/,"") ); }; // `computeWindowScale` counts the scale factor between window size and size // defined for the presentation in the config. var computeWindowScale = function ( config ) { var hScale = window.innerHeight / config.height, wScale = window.innerWidth / config.width, scale = hScale > wScale ? wScale : hScale; if (config.maxScale && scale > config.maxScale) { scale = config.maxScale; } if (config.minScale && scale < config.minScale) { scale = config.minScale; } return scale; }; // CHECK SUPPORT var body = document.body; var ua = navigator.userAgent.toLowerCase(); var impressSupported = // browser should support CSS 3D transtorms ( pfx("perspective") !== null ) && // and `classList` and `dataset` APIs ( body.classList ) && ( body.dataset ) && // but some mobile devices need to be blacklisted, // because their CSS 3D support or hardware is not // good enough to run impress.js properly, sorry... ( ua.search(/(iphone)|(ipod)|(android)/) === -1 ); if (!impressSupported) { // we can't be sure that `classList` is supported body.className += " impress-not-supported "; } else { body.classList.remove("impress-not-supported"); body.classList.add("impress-supported"); } // GLOBALS AND DEFAULTS // Getting cross-browser transitionEnd event name. // It's hard to detect it, so we are using the list based on // https://developer.mozilla.org/en/CSS/CSS_transitions var transitionEnd = ({ 'transition' : 'transitionEnd', 'OTransition' : 'oTransitionEnd', 'msTransition' : 'MSTransitionEnd', // who knows how it will end up? 'MozTransition' : 'transitionend', 'WebkitTransition' : 'webkitTransitionEnd' })[pfx("transition")]; // This is were the root elements of all impress.js instances will be kept. // Yes, this means you can have more than one instance on a page, but I'm not // sure if it makes any sense in practice ;) var roots = {}; // some default config values. var defaults = { width: 1024, height: 768, maxScale: 1, minScale: 0, perspective: 1000, transitionDuration: 1000 }; // it's just an empty function ... and a useless comment. var empty = function () { return false; }; // IMPRESS.JS API // And that's where intresting things will start to happen. // It's the core `impress` function that returns the impress.js API // for a presentation based on the element with given id ('impress' // by default). var impress = window.impress = function ( rootId ) { // If impress.js is not supported by the browser return a dummy API // it may not be a perfect solution but we return early and avoid // running code that may use features not implemented in the browser. if (!impressSupported) { return { init: empty, goto: empty, prev: empty, next: empty }; } rootId = rootId || "impress"; // if given root is already initialized just return the API if (roots["impress-root-" + rootId]) { return roots["impress-root-" + rootId]; } // data of all presentation steps var stepsData = {}; // element of currently active step var activeStep = null; // current state (position, rotation and scale) of the presentation var currentState = null; // array of step elements var steps = null; // configuration options var config = null; // scale factor of the browser window var windowScale = null; // root presentation elements var root = byId( rootId ); var canvas = document.createElement("div"); var initialized = false; // STEP EVENTS // // There are currently two step events triggered by impress.js // `impress:stepenter` is triggered when the step is shown on the // screen (the transition from the previous one is finished) and // `impress:stepleave` is triggered when the step is left (the // transition to next step just starts). // reference to last entered step var lastEntered = null; // `onStepEnter` is called whenever the step element is entered // but the event is triggered only if the step is different than // last entered step. var onStepEnter = function (step) { if (lastEntered !== step) { triggerEvent(step, "impress:stepenter"); lastEntered = step; } }; // `onStepLeave` is called whenever the step element is left // but the event is triggered only if the step is the same as // last entered step. var onStepLeave = function (step) { if (lastEntered === step) { triggerEvent(step, "impress:stepleave"); lastEntered = null; } }; // To detect the moment when the transition to step element finished // we need to handle the transitionEnd event. // // It may not sound very hard but to makes things a little bit more // complicated there are two elements being animated separately: // `root` (used for scaling) and `canvas` for translate and rotations. // Transitions on them are triggered with different delays (to make // visually nice and 'natural' looking transitions), so we need to know // that both of them are finished. // // It sounds like a simple counter to two would be enough. Unfortunately // if there is no change in the transform value (for example scale doesn't // change between two steps) only one transition (and transitionEnd event) // will be triggered. // // So to properly detect when the transitions finished we need to keep // the `expectedTransitionTarget` (that can be one of `root` or `canvas`) // and only call `onStepEnter` then transition ended on the expected one. var expectedTransitionTarget = null; var onTransitionEnd = function (event) { if (event.target === expectedTransitionTarget) { onStepEnter(activeStep); } }; // `initStep` initializes given step element by reading data from its // data attributes and setting correct styles. var initStep = function ( el, idx ) { var data = el.dataset, step = { translate: { x: toNumber(data.x), y: toNumber(data.y), z: toNumber(data.z) }, rotate: { x: toNumber(data.rotateX), y: toNumber(data.rotateY), z: toNumber(data.rotateZ || data.rotate) }, scale: toNumber(data.scale, 1), el: el }; if ( !el.id ) { el.id = "step-" + (idx + 1); } stepsData["impress-" + el.id] = step; css(el, { position: "absolute", transform: "translate(-50%,-50%)" + translate(step.translate) + rotate(step.rotate) + scale(step.scale), transformStyle: "preserve-3d" }); }; // `init` API function that initializes (and runs) the presentation. var init = function () { if (initialized) { return; } // First we set up the viewport for mobile devices. // For some reason iPad goes nuts when it is not done properly. var meta = $("meta[name='viewport']") || document.createElement("meta"); meta.content = "width=device-width, minimum-scale=1, maximum-scale=1, user-scalable=no"; if (meta.parentNode !== document.head) { meta.name = 'viewport'; document.head.appendChild(meta); } // initialize configuration object var rootData = root.dataset; config = { width: toNumber( rootData.width, defaults.width ), height: toNumber( rootData.height, defaults.height ), maxScale: toNumber( rootData.maxScale, defaults.maxScale ), minScale: toNumber( rootData.minScale, defaults.minScale ), perspective: toNumber( rootData.perspective, defaults.perspective ), transitionDuration: toNumber( rootData.transitionDuration, defaults.transitionDuration ) }; windowScale = computeWindowScale( config ); // wrap steps with "canvas" element arrayify( root.childNodes ).forEach(function ( el ) { canvas.appendChild( el ); }); root.appendChild(canvas); // set initial styles document.documentElement.style.height = "100%"; css(body, { height: "100%", overflow: "hidden" }); var rootStyles = { position: "absolute", transformOrigin: "top left", transition: "all 0s ease-in-out", transformStyle: "preserve-3d" }; css(root, rootStyles); css(root, { top: "50%", left: "50%", transform: perspective( config.perspective/windowScale ) + scale( windowScale ) }); css(canvas, rootStyles); root.addEventListener(transitionEnd, onTransitionEnd, false); body.classList.remove("impress-disabled"); body.classList.add("impress-enabled"); // get and init steps steps = $$(".step", root); steps.forEach( initStep ); // set a default initial state of the canvas currentState = { translate: { x: 0, y: 0, z: 0 }, rotate: { x: 0, y: 0, z: 0 }, scale: 1 }; initialized = true; triggerEvent(root, "impress:init", { api: roots[ "impress-root-" + rootId ] }); }; // `getStep` is a helper function that returns a step element defined by parameter. // If a number is given, step with index given by the number is returned, if a string // is given step element with such id is returned, if DOM element is given it is returned // if it is a correct step element. var getStep = function ( step ) { if (typeof step === "number") { step = step < 0 ? steps[ steps.length + step] : steps[ step ]; } else if (typeof step === "string") { step = byId(step); } return (step && step.id && stepsData["impress-" + step.id]) ? step : null; }; // `goto` API function that moves to step given with `el` parameter (by index, id or element), // with a transition `duration` optionally given as second parameter. var goto = function ( el, duration ) { if ( !initialized || !(el = getStep(el)) ) { // presentation not initialized or given element is not a step return false; } // Sometimes it's possible to trigger focus on first link with some keyboard action. // Browser in such a case tries to scroll the page to make this element visible // (even that body overflow is set to hidden) and it breaks our careful positioning. // // So, as a lousy (and lazy) workaround we will make the page scroll back to the top // whenever slide is selected // // If you are reading this and know any better way to handle it, I'll be glad to hear about it! window.scrollTo(0, 0); var step = stepsData["impress-" + el.id]; if ( activeStep ) { activeStep.classList.remove("active"); body.classList.remove("impress-on-" + activeStep.id); } el.classList.add("active"); body.classList.add("impress-on-" + el.id); // compute target state of the canvas based on given step var target = { rotate: { x: -step.rotate.x, y: -step.rotate.y, z: -step.rotate.z }, translate: { x: -step.translate.x, y: -step.translate.y, z: -step.translate.z }, scale: 1 / step.scale }; // Check if the transition is zooming in or not. // // This information is used to alter the transition style: // when we are zooming in - we start with move and rotate transition // and the scaling is delayed, but when we are zooming out we start // with scaling down and move and rotation are delayed. var zoomin = target.scale >= currentState.scale; duration = toNumber(duration, config.transitionDuration); var delay = (duration / 2); // if the same step is re-selected, force computing window scaling, // because it is likely to be caused by window resize if (el === activeStep) { windowScale = computeWindowScale(config); } var targetScale = target.scale * windowScale; // Because one of the transition is delayed depending on zoom direction, // the last transition will happen on `root` or `canvas` element. // Here we store the expected transition event target, to be able to correctly // trigger `impress:stepenter` event. expectedTransitionTarget = target.scale > currentState.scale ? root : canvas; // trigger leave of currently active element (if it's not the same step again) if (activeStep && activeStep !== el) { onStepLeave(activeStep); } // alter transforms of `root` and `canvas` to trigger transitions css(root, { // to keep the perspective look similar for different scales // we need to 'scale' the perspective, too transform: perspective( config.perspective / targetScale ) + scale( targetScale ), transitionDuration: duration + "ms", transitionDelay: (zoomin ? delay : 0) + "ms" }); css(canvas, { transform: rotate(target.rotate, true) + translate(target.translate), transitionDuration: duration + "ms", transitionDelay: (zoomin ? 0 : delay) + "ms" }); // store current state currentState = target; activeStep = el; // manually trigger enter event if duration was set to 0 if (duration === 0) { onStepEnter(activeStep); } return el; }; // `prev` API function goes to previous step (in document order) var prev = function () { var prev = steps.indexOf( activeStep ) - 1; prev = prev >= 0 ? steps[ prev ] : steps[ steps.length-1 ]; return goto(prev); }; // `next` API function goes to next step (in document order) var next = function () { var next = steps.indexOf( activeStep ) + 1; next = next < steps.length ? steps[ next ] : steps[ 0 ]; return goto(next); }; // Adding some useful classes to step elements. // // All the steps that have not been shown yet are given `future` class. // When the step is entered the `future` class is removed and the `present` // class is given. When the step is left `present` class is replaced with // `past` class. // // So every step element is always in one of three possible states: // `future`, `present` and `past`. // // There classes can be used in CSS to style different types of steps. // For example the `present` class can be used to trigger some custom // animations when step is shown. root.addEventListener("impress:init", function(){ // STEP CLASSES steps.forEach(function (step) { step.classList.add("future"); }); root.addEventListener("impress:stepenter", function (event) { event.target.classList.remove("past"); event.target.classList.remove("future"); event.target.classList.add("present"); }, false); root.addEventListener("impress:stepleave", function (event) { event.target.classList.remove("present"); event.target.classList.add("past"); }, false); }, false); // Adding hash change support. root.addEventListener("impress:init", function(){ // last hash detected var lastHash = ""; // `#/step-id` is used instead of `#step-id` to prevent default browser // scrolling to element in hash. // // And it has to be set after animation finishes, because in Chrome it // makes transtion laggy. // BUG: http://code.google.com/p/chromium/issues/detail?id=62820 root.addEventListener("impress:stepenter", function (event) { window.location.hash = lastHash = "#/" + event.target.id; }, false); window.addEventListener("hashchange", function () { // When the step is entered hash in the location is updated // (just few lines above from here), so the hash change is // triggered and we would call `goto` again on the same element. // // To avoid this we store last entered hash and compare. if (window.location.hash !== lastHash) { goto( getElementFromHash() ); } }, false); // START // by selecting step defined in url or first step of the presentation goto(getElementFromHash() || steps[0], 0); }, false); body.classList.add("impress-disabled"); // store and return API for given impress.js root element return (roots[ "impress-root-" + rootId ] = { init: init, goto: goto, next: next, prev: prev }); }; // flag that can be used in JS to check if browser have passed the support test impress.supported = impressSupported; })(document, window); // NAVIGATION EVENTS // As you can see this part is separate from the impress.js core code. // It's because these navigation actions only need what impress.js provides with // its simple API. // // In future I think about moving it to make them optional, move to separate files // and treat more like a 'plugins'. (function ( document, window ) { 'use strict'; // throttling function calls, by Remy Sharp // http://remysharp.com/2010/07/21/throttling-function-calls/ var throttle = function (fn, delay) { var timer = null; return function () { var context = this, args = arguments; clearTimeout(timer); timer = setTimeout(function () { fn.apply(context, args); }, delay); }; }; // wait for impress.js to be initialized document.addEventListener("impress:init", function (event) { // Getting API from event data. // So you don't event need to know what is the id of the root element // or anything. `impress:init` event data gives you everything you // need to control the presentation that was just initialized. var api = event.detail.api; // KEYBOARD NAVIGATION HANDLERS // Prevent default keydown action when one of supported key is pressed. document.addEventListener("keydown", function ( event ) { if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) { event.preventDefault(); } }, false); // Trigger impress action (next or prev) on keyup. // Supported keys are: // [space] - quite common in presentation software to move forward // [up] [right] / [down] [left] - again common and natural addition, // [pgdown] / [pgup] - often triggered by remote controllers, // [tab] - this one is quite controversial, but the reason it ended up on // this list is quite an interesting story... Remember that strange part // in the impress.js code where window is scrolled to 0,0 on every presentation // step, because sometimes browser scrolls viewport because of the focused element? // Well, the [tab] key by default navigates around focusable elements, so clicking // it very often caused scrolling to focused element and breaking impress.js // positioning. I didn't want to just prevent this default action, so I used [tab] // as another way to moving to next step... And yes, I know that for the sake of // consistency I should add [shift+tab] as opposite action... document.addEventListener("keyup", function ( event ) { if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) { switch( event.keyCode ) { case 33: // pg up case 37: // left case 38: // up api.prev(); break; case 9: // tab case 32: // space case 34: // pg down case 39: // right case 40: // down api.next(); break; } event.preventDefault(); } }, false); // delegated handler for clicking on the links to presentation steps document.addEventListener("click", function ( event ) { // event delegation with "bubbling" // check if event target (or any of its parents is a link) var target = event.target; while ( (target.tagName !== "A") && (target !== document.documentElement) ) { target = target.parentNode; } if ( target.tagName === "A" ) { var href = target.getAttribute("href"); // if it's a link to presentation step, target this step if ( href && href[0] === '#' ) { target = document.getElementById( href.slice(1) ); } } if ( api.goto(target) ) { event.stopImmediatePropagation(); event.preventDefault(); } }, false); // delegated handler for clicking on step elements document.addEventListener("click", function ( event ) { var target = event.target; // find closest step element that is not active while ( !(target.classList.contains("step") && !target.classList.contains("active")) && (target !== document.documentElement) ) { target = target.parentNode; } if ( api.goto(target) ) { event.preventDefault(); } }, false); // touch handler to detect taps on the left and right side of the screen // based on awesome work of @hakimel: https://github.com/hakimel/reveal.js document.addEventListener("touchstart", function ( event ) { if (event.touches.length === 1) { var x = event.touches[0].clientX, width = window.innerWidth * 0.3, result = null; if ( x < width ) { result = api.prev(); } else if ( x > window.innerWidth - width ) { result = api.next(); } if (result) { event.preventDefault(); } } }, false); // rescale presentation when window is resized window.addEventListener("resize", throttle(function () { // force going to active step again, to trigger rescaling api.goto( document.querySelector(".active"), 500 ); }, 250), false); }, false); })(document, window); // THAT'S ALL FOLKS! // // Thanks for reading it all. // Or thanks for scrolling down and reading the last part. // // I've learnt a lot when building impress.js and I hope this code and comments // will help somebody learn at least some part of it.

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