1/*! 2 * reveal.js 3 * http://lab.hakim.se/reveal-js 4 * MIT licensed 5 * 6 * Copyright (C) 2015 Hakim El Hattab, http://hakim.se 7 */ 8(function( root, factory ) { 9 if( typeof define === 'function' && define.amd ) { 10 // AMD. Register as an anonymous module. 11 define( function() { 12 root.Reveal = factory(); 13 return root.Reveal; 14 } ); 15 } else if( typeof exports === 'object' ) { 16 // Node. Does not work with strict CommonJS. 17 module.exports = factory(); 18 } else { 19 // Browser globals. 20 root.Reveal = factory(); 21 } 22}( this, function() { 23 24 'use strict'; 25 26 var Reveal; 27 28 var SLIDES_SELECTOR = '.slides section', 29 HORIZONTAL_SLIDES_SELECTOR = '.slides>section', 30 VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section', 31 HOME_SLIDE_SELECTOR = '.slides>section:first-of-type', 32 33 // Configuration defaults, can be overridden at initialization time 34 config = { 35 36 // The "normal" size of the presentation, aspect ratio will be preserved 37 // when the presentation is scaled to fit different resolutions 38 width: 960, 39 height: 700, 40 41 // Factor of the display size that should remain empty around the content 42 margin: 0.1, 43 44 // Bounds for smallest/largest possible scale to apply to content 45 minScale: 0.2, 46 maxScale: 1.5, 47 48 // Display controls in the bottom right corner 49 controls: true, 50 51 // Display a presentation progress bar 52 progress: true, 53 54 // Display the page number of the current slide 55 slideNumber: false, 56 57 // Push each slide change to the browser history 58 history: false, 59 60 // Enable keyboard shortcuts for navigation 61 keyboard: true, 62 63 // Optional function that blocks keyboard events when retuning false 64 keyboardCondition: null, 65 66 // Enable the slide overview mode 67 overview: true, 68 69 // Vertical centering of slides 70 center: true, 71 72 // Enables touch navigation on devices with touch input 73 touch: true, 74 75 // Loop the presentation 76 loop: false, 77 78 // Change the presentation direction to be RTL 79 rtl: false, 80 81 // Turns fragments on and off globally 82 fragments: true, 83 84 // Flags if the presentation is running in an embedded mode, 85 // i.e. contained within a limited portion of the screen 86 embedded: false, 87 88 // Flags if we should show a help overlay when the questionmark 89 // key is pressed 90 help: true, 91 92 // Flags if it should be possible to pause the presentation (blackout) 93 pause: true, 94 95 // Number of milliseconds between automatically proceeding to the
96 // next slide, disabled when set to 0, this value can be overwritten 97 // by using a data-autoslide attribute on your slides 98 autoSlide: 0, 99 100 // Stop auto-sliding after user input 101 autoSlideStoppable: true, 102 103 // Enable slide navigation via mouse wheel 104 mouseWheel: false, 105 106 // Apply a 3D roll to links on hover 107 rollingLinks: false, 108 109 // Hides the address bar on mobile devices 110 hideAddressBar: true, 111 112 // Opens links in an iframe preview overlay 113 previewLinks: false, 114 115 // Exposes the reveal.js API through window.postMessage 116 postMessage: true, 117 118 // Dispatches all reveal.js events to the parent window through postMessage 119 postMessageEvents: false, 120 121 // Focuses body when page changes visiblity to ensure keyboard shortcuts work 122 focusBodyOnPageVisibilityChange: true, 123 124 // Transition style 125 transition: 'slide', // none/fade/slide/convex/concave/zoom 126 127 // Transition speed 128 transitionSpeed: 'default', // default/fast/slow 129 130 // Transition style for full page slide backgrounds 131 backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom 132 133 // Parallax background image 134 parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg" 135 136 // Parallax background size 137 parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" 138 139 // Amount of pixels to move the parallax background per slide step 140 parallaxBackgroundHorizontal: null, 141 parallaxBackgroundVertical: null, 142 143 // Number of slides away from the current that are visible 144 viewDistance: 3, 145 146 // Script dependencies to load 147 dependencies: [] 148 149 }, 150 151 // Flags if reveal.js is loaded (has dispatched the 'ready' event) 152 loaded = false, 153 154 // Flags if the overview mode is currently active 155 overview = false, 156 157 // The horizontal and vertical index of the currently active slide 158 indexh, 159 indexv, 160 161 // The previous and current slide HTML elements 162 previousSlide, 163 currentSlide, 164 165 previousBackground, 166 167 // Slides may hold a data-state attribute which we pick up and apply 168 // as a class to the body. This list contains the combined state of 169 // all current slides. 170 state = [], 171 172 // The current scale of the presentation (see width/height config) 173 scale = 1, 174 175 // CSS transform that is currently applied to the slides container, 176 // split into two groups 177 slidesTransform = { layout: '', overview: '' }, 178 179 // Cached references to DOM elements 180 dom = {}, 181 182 // Features supported by the browser, see #checkCapabilities() 183 features = {}, 184 185 // Client is a mobile device, see #checkCapabilities() 186 isMobileDevice, 187 188 // Throttles mouse wheel navigation 189 lastMouseWheelStep = 0, 190 191 // Delays updates to the URL due to a Chrome thumbnailer bug 192 writeURLTimeout = 0, 193 194 // Flags if the interaction event listeners are bound 195 eventsAreBound = false, 196 197 // The current auto-slide duration 198 autoSlide = 0, 199 200 // Auto slide properties 201 autoSlidePlayer, 202 autoSlideTimeout = 0, 203 autoSlideStartTime = -1, 204 autoSlidePaused = false, 205 206 // Holds information about the currently ongoing touch input 207 touch = { 208 startX: 0, 209 startY: 0, 210 startSpan: 0, 211 startCount: 0, 212 captured: false, 213 threshold: 40 214 }, 215 216 // Holds information about the keyboard shortcuts 217 keyboardShortcuts = { 218 'N , SPACE': 'Next slide', 219 'P': 'Previous slide', 220 '← , H': 'Navigate left', 221 '→ , L': 'Navigate right', 222 '↑ , K': 'Navigate up', 223 '↓ , J': 'Navigate down', 224 'Home': 'First slide', 225 'End': 'Last slide', 226 'B , .': 'Pause', 227 'F': 'Fullscreen', 228 'ESC, O': 'Slide overview' 229 }; 230 231 /** 232 * Starts up the presentation if the client is capable. 233 */ 234 function initialize( options ) { 235 236 checkCapabilities(); 237 238 if( !features.transforms2d && !features.transforms3d ) { 239 document.body.setAttribute( 'class', 'no-transforms' ); 240 241 // Since JS won't be running any further, we load all lazy 242 // loading elements upfront 243 var images = toArray( document.getElementsByTagName( 'img' ) ), 244 iframes = toArray( document.getElementsByTagName( 'iframe' ) ); 245 246 var lazyLoadable = images.concat( iframes ); 247 248 for( var i = 0, len = lazyLoadable.length; i < len; i++ ) { 249 var element = lazyLoadable[i]; 250 if( element.getAttribute( 'data-src' ) ) { 251 element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); 252 element.removeAttribute( 'data-src' ); 253 } 254 } 255 256 // If the browser doesn't support core features we won't be 257 // using JavaScript to control the presentation 258 return; 259 } 260 261 // Cache references to key DOM elements 262 dom.wrapper = document.querySelector( '.reveal' ); 263 dom.slides = document.querySelector( '.reveal .slides' ); 264 265 // Force a layout when the whole page, incl fonts, has loaded 266 window.addEventListener( 'load', layout, false ); 267 268 var query = Reveal.getQueryHash(); 269
270 // Do not accept new dependencies via query config to avoid 271 // the potential of malicious script injection 272 if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies']; 273 274 // Copy options over to our config object 275 extend( config, options ); 276 extend( config, query ); 277 278 // Hide the address bar in mobile browsers 279 hideAddressBar(); 280 281 // Loads the dependencies and continues to #start() once done 282 load(); 283 284 } 285 286 /** 287 * Inspect the client to see what it's capable of, this 288 * should only happens once per runtime. 289 */ 290 function checkCapabilities() { 291 292 features.transforms3d = 'WebkitPerspective' in document.body.style || 293 'MozPerspective' in document.body.style || 294 'msPerspective' in document.body.style || 295 'OPerspective' in document.body.style || 296 'perspective' in document.body.style; 297 298 features.transforms2d = 'WebkitTransform' in document.body.style || 299 'MozTransform' in document.body.style || 300 'msTransform' in document.body.style || 301 'OTransform' in document.body.style || 302 'transform' in document.body.style; 303 304 features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame; 305 features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function'; 306 307 features.canvas = !!document.createElement( 'canvas' ).getContext; 308 309 features.touch = !!( 'ontouchstart' in window ); 310 311 // Transitions in the overview are disabled in desktop and 312 // mobile Safari due to lag 313 features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent ); 314 315 isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent ); 316 317 } 318 319 /** 320 * Loads the dependencies of reveal.js. Dependencies are 321 * defined via the configuration option 'dependencies' 322 * and will be loaded prior to starting/binding reveal.js. 323 * Some dependencies may have an 'async' flag, if so they 324 * will load after reveal.js has been started up. 325 */ 326 function load() { 327 328 var scripts = [], 329 scriptsAsync = [], 330 scriptsToPreload = 0; 331 332 // Called once synchronous scripts finish loading 333 function proceed() { 334 if( scriptsAsync.length ) { 335 // Load asynchronous scripts 336 head.js.apply( null, scriptsAsync ); 337 } 338 339 start(); 340 } 341 342 function loadScript( s ) { 343 head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() { 344 // Extension may contain callback functions 345 if( typeof s.callback === 'function' ) { 346 s.callback.apply( this ); 347 } 348 349 if( --scriptsToPreload === 0 ) { 350 proceed(); 351 } 352 }); 353 } 354 355 for( var i = 0, len = config.dependencies.length; i < len; i++ ) { 356 var s = config.dependencies[i]; 357 358 // Load if there's no condition or the condition is truthy 359 if( !s.condition || s.condition() ) { 360 if( s.async ) { 361 scriptsAsync.push( s.src ); 362 } 363 else { 364 scripts.push( s.src ); 365 } 366 367 loadScript( s ); 368 } 369 } 370 371 if( scripts.length ) { 372 scriptsToPreload = scripts.length; 373 374 // Load synchronous scripts 375 head.js.apply( null, scripts ); 376 } 377 else { 378 proceed(); 379 } 380 381 } 382 383 /** 384 * Starts up reveal.js by binding input events and navigating 385 * to the current URL deeplink if there is one. 386 */ 387 function start() { 388 389 // Make sure we've got all the DOM elements we need 390 setupDOM(); 391 392 // Listen to messages posted to this window 393 setupPostMessage(); 394 395 // Prevent iframes from scrolling the slides out of view 396 setupIframeScrollPrevention(); 397 398 // Resets all vertical slides so that only the first is visible 399 resetVerticalSlides(); 400 401 // Updates the presentation to match the current configuration values 402 configure(); 403 404 // Read the initial hash 405 readURL(); 406 407 // Update all backgrounds
408 updateBackground( true ); 409 410 // Notify listeners that the presentation is ready but use a 1ms 411 // timeout to ensure it's not fired synchronously after #initialize() 412 setTimeout( function() { 413 // Enable transitions now that we're loaded 414 dom.slides.classList.remove( 'no-transition' ); 415 416 loaded = true; 417 418 dispatchEvent( 'ready', { 419 'indexh': indexh, 420 'indexv': indexv, 421 'currentSlide': currentSlide 422 } ); 423 }, 1 ); 424 425 // Special setup and config is required when printing to PDF 426 if( isPrintingPDF() ) { 427 removeEventListeners(); 428 429 // The document needs to have loaded for the PDF layout 430 // measurements to be accurate 431 if( document.readyState === 'complete' ) { 432 setupPDF(); 433 } 434 else { 435 window.addEventListener( 'load', setupPDF ); 436 } 437 } 438 439 } 440 441 /** 442 * Finds and stores references to DOM elements which are 443 * required by the presentation. If a required element is 444 * not found, it is created. 445 */ 446 function setupDOM() { 447 448 // Prevent transitions while we're loading 449 dom.slides.classList.add( 'no-transition' ); 450 451 // Background element 452 dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null ); 453 454 // Progress bar 455 dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' ); 456 dom.progressbar = dom.progress.querySelector( 'span' ); 457 458 // Arrow controls 459 createSingletonNode( dom.wrapper, 'aside', 'controls', 460 '<div class="navigate-left"></div>' + 461 '<div class="navigate-right"></div>' + 462 '<div class="navigate-up"></div>' + 463 '<div class="navigate-down"></div>' ); 464 465 // Slide number 466 dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' ); 467 468 // Overlay graphic which is displayed during the paused mode 469 createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null ); 470 471 // Cache references to elements 472 dom.controls = document.querySelector( '.reveal .controls' ); 473 dom.theme = document.querySelector( '#theme' ); 474 475 dom.wrapper.setAttribute( 'role', 'application' ); 476 477 // There can be multiple instances of controls throughout the page 478 dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) ); 479 dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) ); 480 dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) ); 481 dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) ); 482 dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) ); 483 dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) ); 484 485 dom.statusDiv = createStatusDiv(); 486 } 487 488 /** 489 * Creates a hidden div with role aria-live to announce the 490 * current slide content. Hide the div off-screen to make it 491 * available only to Assistive Technologies. 492 */ 493 function createStatusDiv() { 494 495 var statusDiv = document.getElementById( 'aria-status-div' ); 496 if( !statusDiv ) { 497 statusDiv = document.createElement( 'div' ); 498 statusDiv.style.position = 'absolute'; 499 statusDiv.style.height = '1px'; 500 statusDiv.style.width = '1px'; 501 statusDiv.style.overflow ='hidden'; 502 statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )'; 503 statusDiv.setAttribute( 'id', 'aria-status-div' ); 504 statusDiv.setAttribute( 'aria-live', 'polite' ); 505 statusDiv.setAttribute( 'aria-atomic','true' ); 506 dom.wrapper.appendChild( statusDiv ); 507 } 508 return statusDiv; 509 510 } 511 512 /** 513 * Configures the presentation for printing to a static 514 * PDF. 515 */ 516 function setupPDF() { 517 518 var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight ); 519 520 // Dimensions of the PDF pages 521 var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ), 522 pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) ); 523 524 // Dimensions of slides within the pages 525 var slideWidth = slideSize.width, 526 slideHeight = slideSize.height; 527 528 // Let the browser know what page size we want to print 529 injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' ); 530 531 // Limit the size of certain elements to the dimensions of the slide 532 injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' ); 533 534 document.body.classList.add( 'print-pdf' ); 535 document.body.style.width = pageWidth + 'px'; 536 document.body.style.height = pageHeight + 'px'; 537 538 // Slide and slide background layout 539 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { 540 541 // Vertical stacks are not centred since their section 542 // children will be 543 if( slide.classList.contains( 'stack' ) === false ) { 544 // Center the slide inside of the page, giving the slide some margin 545 var left = ( pageWidth - slideWidth ) / 2, 546 top = ( pageHeight - slideHeight ) / 2; 547 548 var contentHeight = getAbsoluteHeight( slide ); 549 var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 ); 550 551 // Center slides vertically 552 if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) { 553 top = Math.max( ( pageHeight - contentHeight ) / 2, 0 ); 554 } 555 556 // Position the slide inside of the page 557 slide.style.left = left + 'px'; 558 slide.style.top = top + 'px'; 559 slide.style.width = slideWidth + 'px'; 560
561 // TODO Backgrounds need to be multiplied when the slide 562 // stretches over multiple pages 563 var background = slide.querySelector( '.slide-background' ); 564 if( background ) { 565 background.style.width = pageWidth + 'px'; 566 background.style.height = ( pageHeight * numberOfPages ) + 'px'; 567 background.style.top = -top + 'px'; 568 background.style.left = -left + 'px'; 569 } 570 } 571 572 } ); 573 574 // Show all fragments 575 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) { 576 fragment.classList.add( 'visible' ); 577 } ); 578 579 } 580 581 /** 582 * This is an unfortunate necessity. Iframes can trigger the 583 * parent window to scroll, for example by focusing an input. 584 * This scrolling can not be prevented by hiding overflow in 585 * CSS so we have to resort to repeatedly checking if the 586 * browser has decided to offset our slides :( 587 */ 588 function setupIframeScrollPrevention() { 589 590 if( dom.slides.querySelector( 'iframe' ) ) { 591 setInterval( function() { 592 if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) { 593 dom.wrapper.scrollTop = 0; 594 dom.wrapper.scrollLeft = 0; 595 } 596 }, 500 ); 597 } 598 599 } 600 601 /** 602 * Creates an HTML element and returns a reference to it. 603 * If the element already exists the existing instance will 604 * be returned. 605 */ 606 function createSingletonNode( container, tagname, classname, innerHTML ) { 607 608 // Find all nodes matching the description 609 var nodes = container.querySelectorAll( '.' + classname ); 610 611 // Check all matches to find one which is a direct child of 612 // the specified container 613 for( var i = 0; i < nodes.length; i++ ) { 614 var testNode = nodes[i]; 615 if( testNode.parentNode === container ) { 616 return testNode; 617 } 618 } 619 620 // If no node was found, create it now 621 var node = document.createElement( tagname ); 622 node.classList.add( classname ); 623 if( typeof innerHTML === 'string' ) { 624 node.innerHTML = innerHTML; 625 } 626 container.appendChild( node ); 627 628 return node; 629 630 } 631 632 /** 633 * Creates the slide background elements and appends them 634 * to the background container. One element is created per 635 * slide no matter if the given slide has visible background. 636 */ 637 function createBackgrounds() { 638 639 var printMode = isPrintingPDF(); 640 641 // Clear prior backgrounds 642 dom.background.innerHTML = ''; 643 dom.background.classList.add( 'no-transition' ); 644 645 // Iterate over all horizontal slides 646 toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) { 647 648 var backgroundStack; 649 650 if( printMode ) { 651 backgroundStack = createBackground( slideh, slideh ); 652 } 653 else { 654 backgroundStack = createBackground( slideh, dom.background ); 655 } 656 657 // Iterate over all vertical slides 658 toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) { 659 660 if( printMode ) { 661 createBackground( slidev, slidev ); 662 } 663 else { 664 createBackground( slidev, backgroundStack ); 665 } 666 667 backgroundStack.classList.add( 'stack' ); 668 669 } ); 670 671 } ); 672 673 // Add parallax background if specified 674 if( config.parallaxBackgroundImage ) { 675 676 dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")'; 677 dom.background.style.backgroundSize = config.parallaxBackgroundSize; 678 679 // Make sure the below properties are set on the element - these properties are 680 // needed for proper transitions to be set on the element via CSS. To remove 681 // annoying background slide-in effect when the presentation starts, apply 682 // these properties after short time delay 683 setTimeout( function() { 684 dom.wrapper.classList.add( 'has-parallax-background' ); 685 }, 1 ); 686 687 } 688 else { 689 690 dom.background.style.backgroundImage = ''; 691 dom.wrapper.classList.remove( 'has-parallax-background' ); 692 693 } 694 695 } 696 697 /** 698 * Creates a background for the given slide. 699 * 700 * @param {HTMLElement} slide 701 * @param {HTMLElement} container The element that the background 702 * should be appended to 703 */ 704 function createBackground( slide, container ) { 705 706 var data = { 707 background: slide.getAttribute( 'data-background' ),
708 backgroundSize: slide.getAttribute( 'data-background-size' ), 709 backgroundImage: slide.getAttribute( 'data-background-image' ), 710 backgroundVideo: slide.getAttribute( 'data-background-video' ), 711 backgroundIframe: slide.getAttribute( 'data-background-iframe' ), 712 backgroundColor: slide.getAttribute( 'data-background-color' ), 713 backgroundRepeat: slide.getAttribute( 'data-background-repeat' ), 714 backgroundPosition: slide.getAttribute( 'data-background-position' ), 715 backgroundTransition: slide.getAttribute( 'data-background-transition' ) 716 }; 717 718 var element = document.createElement( 'div' ); 719 720 // Carry over custom classes from the slide to the background 721 element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' ); 722 723 if( data.background ) { 724 // Auto-wrap image urls in url(...) 725 if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) { 726 slide.setAttribute( 'data-background-image', data.background ); 727 } 728 else { 729 element.style.background = data.background; 730 } 731 } 732 733 // Create a hash for this combination of background settings. 734 // This is used to determine when two slide backgrounds are 735 // the same. 736 if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) { 737 element.setAttribute( 'data-background-hash', data.background + 738 data.backgroundSize + 739 data.backgroundImage + 740 data.backgroundVideo + 741 data.backgroundIframe + 742 data.backgroundColor + 743 data.backgroundRepeat + 744 data.backgroundPosition + 745 data.backgroundTransition ); 746 } 747 748 // Additional and optional background properties 749 if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize; 750 if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor; 751 if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat; 752 if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition; 753 if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition ); 754 755 container.appendChild( element ); 756 757 // If backgrounds are being recreated, clear old classes 758 slide.classList.remove( 'has-dark-background' ); 759 slide.classList.remove( 'has-light-background' ); 760 761 // If this slide has a background color, add a class that 762 // signals if it is light or dark. If the slide has no background 763 // color, no class will be set 764 var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor; 765 if( computedBackgroundColor ) { 766 var rgb = colorToRgb( computedBackgroundColor ); 767 768 // Ignore fully transparent backgrounds. Some browsers return 769 // rgba(0,0,0,0) when reading the computed background color of 770 // an element with no background 771 if( rgb && rgb.a !== 0 ) { 772 if( colorBrightness( computedBackgroundColor ) < 128 ) { 773 slide.classList.add( 'has-dark-background' ); 774 } 775 else { 776 slide.classList.add( 'has-light-background' ); 777 } 778 } 779 } 780 781 return element; 782 783 } 784
785 /** 786 * Registers a listener to postMessage events, this makes it 787 * possible to call all reveal.js API methods from another 788 * window. For example: 789 * 790 * revealWindow.postMessage( JSON.stringify({ 791 * method: 'slide', 792 * args: [ 2 ] 793 * }), '*' ); 794 */ 795 function setupPostMessage() { 796 797 if( config.postMessage ) { 798 window.addEventListener( 'message', function ( event ) { 799 var data = event.data; 800 801 // Make sure we're dealing with JSON 802 if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) { 803 data = JSON.parse( data ); 804 805 // Check if the requested method can be found 806 if( data.method && typeof Reveal[data.method] === 'function' ) { 807 Reveal[data.method].apply( Reveal, data.args ); 808 } 809 } 810 }, false ); 811 } 812 813 } 814 815 /** 816 * Applies the configuration settings from the config 817 * object. May be called multiple times. 818 */ 819 function configure( options ) { 820 821 var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length; 822 823 dom.wrapper.classList.remove( config.transition ); 824 825 // New config options may be passed when this method 826 // is invoked through the API after initialization 827 if( typeof options === 'object' ) extend( config, options ); 828 829 // Force linear transition based on browser capabilities 830 if( features.transforms3d === false ) config.transition = 'linear'; 831 832 dom.wrapper.classList.add( config.transition ); 833 834 dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed ); 835 dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition ); 836 837 dom.controls.style.display = config.controls ? 'block' : 'none'; 838 dom.progress.style.display = config.progress ? 'block' : 'none'; 839 840 if( config.rtl ) { 841 dom.wrapper.classList.add( 'rtl' ); 842 } 843 else { 844 dom.wrapper.classList.remove( 'rtl' ); 845 } 846 847 if( config.center ) { 848 dom.wrapper.classList.add( 'center' ); 849 } 850 else { 851 dom.wrapper.classList.remove( 'center' ); 852 } 853 854 // Exit the paused mode if it was configured off 855 if( config.pause === false ) { 856 resume(); 857 } 858 859 if( config.mouseWheel ) { 860 document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF 861 document.addEventListener( 'mousewheel', onDocumentMouseScroll, false ); 862 } 863 else { 864 document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF 865 document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false ); 866 } 867 868 // Rolling 3D links 869 if( config.rollingLinks ) { 870 enableRollingLinks(); 871 } 872 else { 873 disableRollingLinks(); 874 } 875 876 // Iframe link previews 877 if( config.previewLinks ) { 878 enablePreviewLinks(); 879 } 880 else { 881 disablePreviewLinks(); 882 enablePreviewLinks( '[data-preview-link]' ); 883 } 884 885 // Remove existing auto-slide controls 886 if( autoSlidePlayer ) { 887 autoSlidePlayer.destroy(); 888 autoSlidePlayer = null; 889 } 890 891 // Generate auto-slide controls if needed 892 if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) { 893 autoSlidePlayer = new Playback( dom.wrapper, function() { 894 return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 ); 895 } ); 896 897 autoSlidePlayer.on( 'click', onAutoSlidePlayerClick ); 898 autoSlidePaused = false; 899 } 900 901 // When fragments are turned off they should be visible 902 if( config.fragments === false ) { 903 toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) { 904 element.classList.add( 'visible' ); 905 element.classList.remove( 'current-fragment' ); 906 } ); 907 } 908 909 sync(); 910 911 } 912 913 /** 914 * Binds all event listeners. 915 */ 916 function addEventListeners() { 917 918 eventsAreBound = true; 919 920 window.addEventListener( 'hashchange', onWindowHashChange, false ); 921 window.addEventListener( 'resize', onWindowResize, false ); 922 923 if( config.touch ) { 924 dom.wrapper.addEventListener( 'touchstart', onTouchStart, false ); 925 dom.wrapper.addEventListener( 'touchmove', onTouchMove, false ); 926 dom.wrapper.addEventListener( 'touchend', onTouchEnd, false ); 927 928 // Support pointer-style touch interaction as well 929 if( window.navigator.pointerEnabled ) { 930 // IE 11 uses un-prefixed version of pointer events 931 dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false ); 932 dom.wrapper.addEventListener( 'pointermove', onPointerMove, false ); 933 dom.wrapper.addEventListener( 'pointerup', onPointerUp, false ); 934 } 935 else if( window.navigator.msPointerEnabled ) { 936 // IE 10 uses prefixed version of pointer events 937 dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false ); 938 dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false ); 939 dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false ); 940 } 941 } 942 943 if( config.keyboard ) { 944 document.addEventListener( 'keydown', onDocumentKeyDown, false ); 945 document.addEventListener( 'keypress', onDocumentKeyPress, false ); 946 } 947 948 if( config.progress && dom.progress ) { 949 dom.progress.addEventListener( 'click', onProgressClicked, false ); 950 } 951 952 if( config.focusBodyOnPageVisibilityChange ) { 953 var visibilityChange; 954 955 if( 'hidden' in document ) { 956 visibilityChange = 'visibilitychange'; 957 } 958 else if( 'msHidden' in document ) { 959 visibilityChange = 'msvisibilitychange'; 960 } 961 else if( 'webkitHidden' in document ) { 962 visibilityChange = 'webkitvisibilitychange'; 963 } 964 965 if( visibilityChange ) { 966 document.addEventListener( visibilityChange, onPageVisibilityChange, false ); 967 } 968 } 969 970 // Listen to both touch and click events, in case the device 971 // supports both 972 var pointerEvents = [ 'touchstart', 'click' ]; 973 974 // Only support touch for Android, fixes double navigations in 975 // stock browser 976 if( navigator.userAgent.match( /android/gi ) ) { 977 pointerEvents = [ 'touchstart' ]; 978 } 979
980 pointerEvents.forEach( function( eventName ) { 981 dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } ); 982 dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } ); 983 dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } ); 984 dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } ); 985 dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } ); 986 dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } ); 987 } ); 988 989 } 990 991 /** 992 * Unbinds all event listeners. 993 */ 994 function removeEventListeners() { 995 996 eventsAreBound = false; 997 998 document.removeEventListener( 'keydown', onDocumentKeyDown, false ); 999 document.removeEventListener( 'keypress', onDocumentKeyPress, false ); 1000 window.removeEventListener( 'hashchange', onWindowHashChange, false ); 1001 window.removeEventListener( 'resize', onWindowResize, false ); 1002 1003 dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false ); 1004 dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false ); 1005 dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false ); 1006 1007 // IE11 1008 if( window.navigator.pointerEnabled ) { 1009 dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false ); 1010 dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false ); 1011 dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false ); 1012 } 1013 // IE10 1014 else if( window.navigator.msPointerEnabled ) { 1015 dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false ); 1016 dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false ); 1017 dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false ); 1018 } 1019 1020 if ( config.progress && dom.progress ) { 1021 dom.progress.removeEventListener( 'click', onProgressClicked, false ); 1022 } 1023 1024 [ 'touchstart', 'click' ].forEach( function( eventName ) { 1025 dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } ); 1026 dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } ); 1027 dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } ); 1028 dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } ); 1029 dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } ); 1030 dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } ); 1031 } ); 1032 1033 } 1034 1035 /** 1036 * Extend object a with the properties of object b. 1037 * If there's a conflict, object b takes precedence. 1038 */ 1039 function extend( a, b ) { 1040 1041 for( var i in b ) { 1042 a[ i ] = b[ i ]; 1043 } 1044 1045 } 1046 1047 /** 1048 * Converts the target object to an array. 1049 */ 1050 function toArray( o ) { 1051 1052 return Array.prototype.slice.call( o ); 1053 1054 } 1055 1056 /** 1057 * Utility for deserializing a value. 1058 */ 1059 function deserialize( value ) { 1060 1061 if( typeof value === 'string' ) { 1062 if( value === 'null' ) return null; 1063 else if( value === 'true' ) return true; 1064 else if( value === 'false' ) return false; 1065 else if( value.match( /^\d+$/ ) ) return parseFloat( value ); 1066 } 1067 1068 return value; 1069 1070 } 1071 1072 /** 1073 * Measures the distance in pixels between point a 1074 * and point b. 1075 * 1076 * @param {Object} a point with x/y properties 1077 * @param {Object} b point with x/y properties 1078 */ 1079 function distanceBetween( a, b ) { 1080 1081 var dx = a.x - b.x, 1082 dy = a.y - b.y; 1083 1084 return Math.sqrt( dx*dx + dy*dy ); 1085 1086 } 1087 1088 /** 1089 * Applies a CSS transform to the target element. 1090 */ 1091 function transformElement( element, transform ) { 1092 1093 element.style.WebkitTransform = transform; 1094 element.style.MozTransform = transform; 1095 element.style.msTransform = transform; 1096 element.style.transform = transform; 1097 1098 } 1099 1100 /** 1101 * Applies CSS transforms to the slides container. The container 1102 * is transformed from two separate sources: layout and the overview 1103 * mode. 1104 */ 1105 function transformSlides( transforms ) { 1106 1107 // Pick up new transforms from arguments 1108 if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout; 1109 if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview; 1110 1111 // Apply the transforms to the slides container 1112 if( slidesTransform.layout ) { 1113 transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview ); 1114 } 1115 else { 1116 transformElement( dom.slides, slidesTransform.overview ); 1117 } 1118 1119 } 1120
1121 /** 1122 * Injects the given CSS styles into the DOM. 1123 */ 1124 function injectStyleSheet( value ) { 1125 1126 var tag = document.createElement( 'style' ); 1127 tag.type = 'text/css'; 1128 if( tag.styleSheet ) { 1129 tag.styleSheet.cssText = value; 1130 } 1131 else { 1132 tag.appendChild( document.createTextNode( value ) ); 1133 } 1134 document.getElementsByTagName( 'head' )[0].appendChild( tag ); 1135 1136 } 1137 1138 /** 1139 * Converts various color input formats to an {r:0,g:0,b:0} object. 1140 * 1141 * @param {String} color The string representation of a color, 1142 * the following formats are supported: 1143 * - #000 1144 * - #000000 1145 * - rgb(0,0,0) 1146 */ 1147 function colorToRgb( color ) { 1148 1149 var hex3 = color.match( /^#([0-9a-f]{3})$/i ); 1150 if( hex3 && hex3[1] ) { 1151 hex3 = hex3[1]; 1152 return { 1153 r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11, 1154 g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11, 1155 b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11 1156 }; 1157 } 1158 1159 var hex6 = color.match( /^#([0-9a-f]{6})$/i ); 1160 if( hex6 && hex6[1] ) { 1161 hex6 = hex6[1]; 1162 return { 1163 r: parseInt( hex6.substr( 0, 2 ), 16 ), 1164 g: parseInt( hex6.substr( 2, 2 ), 16 ), 1165 b: parseInt( hex6.substr( 4, 2 ), 16 ) 1166 }; 1167 } 1168 1169 var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i ); 1170 if( rgb ) { 1171 return { 1172 r: parseInt( rgb[1], 10 ), 1173 g: parseInt( rgb[2], 10 ), 1174 b: parseInt( rgb[3], 10 ) 1175 }; 1176 } 1177 1178 var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i ); 1179 if( rgba ) { 1180 return { 1181 r: parseInt( rgba[1], 10 ), 1182 g: parseInt( rgba[2], 10 ), 1183 b: parseInt( rgba[3], 10 ), 1184 a: parseFloat( rgba[4] ) 1185 }; 1186 } 1187 1188 return null; 1189 1190 } 1191 1192 /** 1193 * Calculates brightness on a scale of 0-255. 1194 * 1195 * @param color See colorStringToRgb for supported formats. 1196 */ 1197 function colorBrightness( color ) { 1198 1199 if( typeof color === 'string' ) color = colorToRgb( color ); 1200 1201 if( color ) { 1202 return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000; 1203 } 1204 1205 return null; 1206 1207 } 1208 1209 /** 1210 * Retrieves the height of the given element by looking 1211 * at the position and height of its immediate children. 1212 */ 1213 function getAbsoluteHeight( element ) { 1214 1215 var height = 0; 1216 1217 if( element ) { 1218 var absoluteChildren = 0; 1219 1220 toArray( element.childNodes ).forEach( function( child ) { 1221 1222 if( typeof child.offsetTop === 'number' && child.style ) { 1223 // Count # of abs children 1224 if( window.getComputedStyle( child ).position === 'absolute' ) { 1225 absoluteChildren += 1; 1226 } 1227 1228 height = Math.max( height, child.offsetTop + child.offsetHeight ); 1229 } 1230 1231 } ); 1232 1233 // If there are no absolute children, use offsetHeight 1234 if( absoluteChildren === 0 ) { 1235 height = element.offsetHeight; 1236 } 1237 1238 } 1239 1240 return height; 1241 1242 } 1243 1244 /** 1245 * Returns the remaining height within the parent of the 1246 * target element. 1247 * 1248 * remaining height = [ configured parent height ] - [ current parent height ] 1249 */ 1250 function getRemainingHeight( element, height ) { 1251 1252 height = height || 0; 1253 1254 if( element ) { 1255 var newHeight, oldHeight = element.style.height; 1256 1257 // Change the .stretch element height to 0 in order find the height of all 1258 // the other elements 1259 element.style.height = '0px'; 1260 newHeight = height - element.parentNode.offsetHeight; 1261 1262 // Restore the old height, just in case 1263 element.style.height = oldHeight + 'px'; 1264 1265 return newHeight; 1266 } 1267 1268 return height; 1269 1270 } 1271 1272 /** 1273 * Checks if this instance is being used to print a PDF. 1274 */ 1275 function isPrintingPDF() { 1276 1277 return ( /print-pdf/gi ).test( window.location.search ); 1278 1279 } 1280 1281 /** 1282 * Hides the address bar if we're on a mobile device. 1283 */ 1284 function hideAddressBar() { 1285 1286 if( config.hideAddressBar && isMobileDevice ) { 1287 // Events that should trigger the address bar to hide 1288 window.addEventListener( 'load', removeAddressBar, false ); 1289 window.addEventListener( 'orientationchange', removeAddressBar, false ); 1290 } 1291 1292 } 1293 1294 /** 1295 * Causes the address bar to hide on mobile devices, 1296 * more vertical space ftw. 1297 */ 1298 function removeAddressBar() { 1299 1300 setTimeout( function() { 1301 window.scrollTo( 0, 1 ); 1302 }, 10 ); 1303 1304 } 1305 1306 /** 1307 * Dispatches an event of the specified type from the 1308 * reveal DOM element. 1309 */ 1310 function dispatchEvent( type, args ) { 1311 1312 var event = document.createEvent( 'HTMLEvents', 1, 2 ); 1313 event.initEvent( type, true, true ); 1314 extend( event, args ); 1315 dom.wrapper.dispatchEvent( event ); 1316 1317 // If we're in an iframe, post each reveal.js event to the 1318 // parent window. Used by the notes plugin 1319 if( config.postMessageEvents && window.parent !== window.self ) { 1320 window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' ); 1321 } 1322 1323 } 1324
1325 /** 1326 * Wrap all links in 3D goodness. 1327 */ 1328 function enableRollingLinks() { 1329 1330 if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) { 1331 var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' ); 1332 1333 for( var i = 0, len = anchors.length; i < len; i++ ) { 1334 var anchor = anchors[i]; 1335 1336 if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) { 1337 var span = document.createElement('span'); 1338 span.setAttribute('data-title', anchor.text); 1339 span.innerHTML = anchor.innerHTML; 1340 1341 anchor.classList.add( 'roll' ); 1342 anchor.innerHTML = ''; 1343 anchor.appendChild(span); 1344 } 1345 } 1346 } 1347 1348 } 1349 1350 /** 1351 * Unwrap all 3D links. 1352 */ 1353 function disableRollingLinks() { 1354 1355 var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' ); 1356 1357 for( var i = 0, len = anchors.length; i < len; i++ ) { 1358 var anchor = anchors[i]; 1359 var span = anchor.querySelector( 'span' ); 1360 1361 if( span ) { 1362 anchor.classList.remove( 'roll' ); 1363 anchor.innerHTML = span.innerHTML; 1364 } 1365 } 1366 1367 } 1368 1369 /** 1370 * Bind preview frame links. 1371 */ 1372 function enablePreviewLinks( selector ) { 1373 1374 var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) ); 1375 1376 anchors.forEach( function( element ) { 1377 if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { 1378 element.addEventListener( 'click', onPreviewLinkClicked, false ); 1379 } 1380 } ); 1381 1382 } 1383 1384 /** 1385 * Unbind preview frame links. 1386 */ 1387 function disablePreviewLinks() { 1388 1389 var anchors = toArray( document.querySelectorAll( 'a' ) ); 1390 1391 anchors.forEach( function( element ) { 1392 if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { 1393 element.removeEventListener( 'click', onPreviewLinkClicked, false ); 1394 } 1395 } ); 1396 1397 } 1398 1399 /** 1400 * Opens a preview window for the target URL. 1401 */ 1402 function showPreview( url ) { 1403 1404 closeOverlay(); 1405 1406 dom.overlay = document.createElement( 'div' ); 1407 dom.overlay.classList.add( 'overlay' ); 1408 dom.overlay.classList.add( 'overlay-preview' ); 1409 dom.wrapper.appendChild( dom.overlay ); 1410 1411 dom.overlay.innerHTML = [ 1412 '<header>', 1413 '<a class="close" href="#"><span class="icon"></span></a>', 1414 '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>', 1415 '</header>', 1416 '<div class="spinner"></div>', 1417 '<div class="viewport">', 1418 '<iframe src="'+ url +'"></iframe>', 1419 '</div>' 1420 ].join(''); 1421 1422 dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) { 1423 dom.overlay.classList.add( 'loaded' ); 1424 }, false ); 1425 1426 dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { 1427 closeOverlay(); 1428 event.preventDefault(); 1429 }, false ); 1430 1431 dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) { 1432 closeOverlay(); 1433 }, false ); 1434 1435 setTimeout( function() { 1436 dom.overlay.classList.add( 'visible' ); 1437 }, 1 ); 1438 1439 } 1440 1441 /** 1442 * Opens a overlay window with help material. 1443 */ 1444 function showHelp() { 1445 1446 if( config.help ) { 1447 1448 closeOverlay(); 1449 1450 dom.overlay = document.createElement( 'div' ); 1451 dom.overlay.classList.add( 'overlay' ); 1452 dom.overlay.classList.add( 'overlay-help' ); 1453 dom.wrapper.appendChild( dom.overlay ); 1454 1455 var html = '<p class="title">Keyboard Shortcuts</p><br/>'; 1456 1457 html += '<table><th>KEY</th><th>ACTION</th>'; 1458 for( var key in keyboardShortcuts ) { 1459 html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>'; 1460 } 1461 1462 html += '</table>'; 1463 1464 dom.overlay.innerHTML = [ 1465 '<header>', 1466 '<a class="close" href="#"><span class="icon"></span></a>', 1467 '</header>', 1468 '<div class="viewport">', 1469 '<div class="viewport-inner">'+ html +'</div>', 1470 '</div>' 1471 ].join(''); 1472 1473 dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { 1474 closeOverlay(); 1475 event.preventDefault(); 1476 }, false ); 1477 1478 setTimeout( function() { 1479 dom.overlay.classList.add( 'visible' ); 1480 }, 1 ); 1481 1482 } 1483 1484 } 1485 1486 /** 1487 * Closes any currently open overlay. 1488 */ 1489 function closeOverlay() { 1490 1491 if( dom.overlay ) { 1492 dom.overlay.parentNode.removeChild( dom.overlay );
1493 dom.overlay = null; 1494 } 1495 1496 } 1497 1498 /** 1499 * Applies JavaScript-controlled layout rules to the 1500 * presentation. 1501 */ 1502 function layout() { 1503 1504 if( dom.wrapper && !isPrintingPDF() ) { 1505 1506 var size = getComputedSlideSize(); 1507 1508 var slidePadding = 20; // TODO Dig this out of DOM 1509 1510 // Layout the contents of the slides 1511 layoutSlideContents( config.width, config.height, slidePadding ); 1512 1513 dom.slides.style.width = size.width + 'px'; 1514 dom.slides.style.height = size.height + 'px'; 1515 1516 // Determine scale of content to fit within available space 1517 scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height ); 1518 1519 // Respect max/min scale settings 1520 scale = Math.max( scale, config.minScale ); 1521 scale = Math.min( scale, config.maxScale ); 1522 1523 // Don't apply any scaling styles if scale is 1 1524 if( scale === 1 ) { 1525 dom.slides.style.zoom = ''; 1526 dom.slides.style.left = ''; 1527 dom.slides.style.top = ''; 1528 dom.slides.style.bottom = ''; 1529 dom.slides.style.right = ''; 1530 transformSlides( { layout: '' } ); 1531 } 1532 else { 1533 // Prefer zooming in desktop Chrome so that content remains crisp 1534 if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) { 1535 dom.slides.style.zoom = scale; 1536 transformSlides( { layout: '' } ); 1537 } 1538 // Apply scale transform as a fallback 1539 else { 1540 dom.slides.style.left = '50%'; 1541 dom.slides.style.top = '50%'; 1542 dom.slides.style.bottom = 'auto'; 1543 dom.slides.style.right = 'auto'; 1544 transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } ); 1545 } 1546 } 1547 1548 // Select all slides, vertical and horizontal 1549 var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ); 1550 1551 for( var i = 0, len = slides.length; i < len; i++ ) { 1552 var slide = slides[ i ]; 1553 1554 // Don't bother updating invisible slides 1555 if( slide.style.display === 'none' ) { 1556 continue; 1557 } 1558 1559 if( config.center || slide.classList.contains( 'center' ) ) { 1560 // Vertical stacks are not centred since their section 1561 // children will be 1562 if( slide.classList.contains( 'stack' ) ) { 1563 slide.style.top = 0; 1564 } 1565 else { 1566 slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px'; 1567 } 1568 } 1569 else { 1570 slide.style.top = ''; 1571 } 1572 1573 } 1574 1575 updateProgress(); 1576 updateParallax(); 1577 1578 } 1579 1580 } 1581 1582 /** 1583 * Applies layout logic to the contents of all slides in 1584 * the presentation. 1585 */ 1586 function layoutSlideContents( width, height, padding ) { 1587 1588 // Handle sizing of elements with the 'stretch' class 1589 toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) { 1590 1591 // Determine how much vertical space we can use 1592 var remainingHeight = getRemainingHeight( element, height ); 1593 1594 // Consider the aspect ratio of media elements 1595 if( /(img|video)/gi.test( element.nodeName ) ) { 1596 var nw = element.naturalWidth || element.videoWidth, 1597 nh = element.naturalHeight || element.videoHeight; 1598 1599 var es = Math.min( width / nw, remainingHeight / nh ); 1600 1601 element.style.width = ( nw * es ) + 'px'; 1602 element.style.height = ( nh * es ) + 'px'; 1603 1604 } 1605 else { 1606 element.style.width = width + 'px'; 1607 element.style.height = remainingHeight + 'px'; 1608 } 1609 1610 } ); 1611 1612 } 1613 1614 /** 1615 * Calculates the computed pixel size of our slides. These 1616 * values are based on the width and height configuration 1617 * options. 1618 */ 1619 function getComputedSlideSize( presentationWidth, presentationHeight ) { 1620 1621 var size = { 1622 // Slide size 1623 width: config.width, 1624 height: config.height, 1625 1626 // Presentation size 1627 presentationWidth: presentationWidth || dom.wrapper.offsetWidth, 1628 presentationHeight: presentationHeight || dom.wrapper.offsetHeight 1629 }; 1630 1631 // Reduce available space by margin 1632 size.presentationWidth -= ( size.presentationWidth * config.margin ); 1633 size.presentationHeight -= ( size.presentationHeight * config.margin ); 1634 1635 // Slide width may be a percentage of available width 1636 if( typeof size.width === 'string' && /%$/.test( size.width ) ) { 1637 size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth; 1638 } 1639 1640 // Slide height may be a percentage of available height 1641 if( typeof size.height === 'string' && /%$/.test( size.height ) ) { 1642 size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight; 1643 } 1644 1645 return size; 1646 1647 } 1648
1649 /** 1650 * Stores the vertical index of a stack so that the same 1651 * vertical slide can be selected when navigating to and 1652 * from the stack. 1653 * 1654 * @param {HTMLElement} stack The vertical stack element 1655 * @param {int} v Index to memorize 1656 */ 1657 function setPreviousVerticalIndex( stack, v ) { 1658 1659 if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { 1660 stack.setAttribute( 'data-previous-indexv', v || 0 ); 1661 } 1662 1663 } 1664 1665 /** 1666 * Retrieves the vertical index which was stored using 1667 * #setPreviousVerticalIndex() or 0 if no previous index 1668 * exists. 1669 * 1670 * @param {HTMLElement} stack The vertical stack element 1671 */ 1672 function getPreviousVerticalIndex( stack ) { 1673 1674 if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { 1675 // Prefer manually defined start-indexv 1676 var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv'; 1677 1678 return parseInt( stack.getAttribute( attributeName ) || 0, 10 ); 1679 } 1680 1681 return 0; 1682 1683 } 1684 1685 /** 1686 * Displays the overview of slides (quick nav) by scaling 1687 * down and arranging all slide elements. 1688 */ 1689 function activateOverview() { 1690 1691 // Only proceed if enabled in config 1692 if( config.overview && !isOverview() ) { 1693 1694 overview = true; 1695 1696 dom.wrapper.classList.add( 'overview' ); 1697 dom.wrapper.classList.remove( 'overview-deactivating' ); 1698 1699 if( features.overviewTransitions ) { 1700 setTimeout( function() { 1701 dom.wrapper.classList.add( 'overview-animated' ); 1702 }, 1 ); 1703 } 1704 1705 // Don't auto-slide while in overview mode 1706 cancelAutoSlide(); 1707 1708 // Move the backgrounds element into the slide container to 1709 // that the same scaling is applied 1710 dom.slides.appendChild( dom.background ); 1711 1712 // Clicking on an overview slide navigates to it 1713 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { 1714 if( !slide.classList.contains( 'stack' ) ) { 1715 slide.addEventListener( 'click', onOverviewSlideClicked, true ); 1716 } 1717 } ); 1718 1719 updateSlidesVisibility(); 1720 layoutOverview(); 1721 updateOverview(); 1722 1723 layout(); 1724 1725 // Notify observers of the overview showing 1726 dispatchEvent( 'overviewshown', { 1727 'indexh': indexh, 1728 'indexv': indexv, 1729 'currentSlide': currentSlide 1730 } ); 1731 1732 } 1733 1734 } 1735 1736 /** 1737 * Uses CSS transforms to position all slides in a grid for 1738 * display inside of the overview mode. 1739 */ 1740 function layoutOverview() { 1741 1742 var margin = 70; 1743 var slideWidth = config.width + margin, 1744 slideHeight = config.height + margin; 1745 1746 // Reverse in RTL mode 1747 if( config.rtl ) { 1748 slideWidth = -slideWidth; 1749 } 1750 1751 // Layout slides 1752 toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) { 1753 hslide.setAttribute( 'data-index-h', h ); 1754 transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' ); 1755 1756 if( hslide.classList.contains( 'stack' ) ) { 1757 1758 toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) { 1759 vslide.setAttribute( 'data-index-h', h ); 1760 vslide.setAttribute( 'data-index-v', v ); 1761 1762 transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' ); 1763 } ); 1764 1765 } 1766 } ); 1767 1768 // Layout slide backgrounds 1769 toArray( dom.background.childNodes ).forEach( function( hbackground, h ) { 1770 transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' ); 1771 1772 toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) { 1773 transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' ); 1774 } ); 1775 } ); 1776 1777 } 1778 1779 /** 1780 * Moves the overview viewport to the current slides. 1781 * Called each time the current slide changes. 1782 */ 1783 function updateOverview() { 1784 1785 var margin = 70; 1786 var slideWidth = config.width + margin, 1787 slideHeight = config.height + margin; 1788 1789 // Reverse in RTL mode 1790 if( config.rtl ) { 1791 slideWidth = -slideWidth; 1792 } 1793 1794 transformSlides( { 1795 overview: [ 1796 'translateX('+ ( -indexh * slideWidth ) +'px)', 1797 'translateY('+ ( -indexv * slideHeight ) +'px)', 1798 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)' 1799 ].join( ' ' ) 1800 } ); 1801 1802 } 1803
1804 /** 1805 * Exits the slide overview and enters the currently 1806 * active slide. 1807 */ 1808 function deactivateOverview() { 1809 1810 // Only proceed if enabled in config 1811 if( config.overview ) { 1812 1813 overview = false; 1814 1815 dom.wrapper.classList.remove( 'overview' ); 1816 dom.wrapper.classList.remove( 'overview-animated' ); 1817 1818 // Temporarily add a class so that transitions can do different things 1819 // depending on whether they are exiting/entering overview, or just 1820 // moving from slide to slide 1821 dom.wrapper.classList.add( 'overview-deactivating' ); 1822 1823 setTimeout( function () { 1824 dom.wrapper.classList.remove( 'overview-deactivating' ); 1825 }, 1 ); 1826 1827 // Move the background element back out 1828 dom.wrapper.appendChild( dom.background ); 1829 1830 // Clean up changes made to slides 1831 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { 1832 transformElement( slide, '' ); 1833 1834 slide.removeEventListener( 'click', onOverviewSlideClicked, true ); 1835 } ); 1836 1837 // Clean up changes made to backgrounds 1838 toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) { 1839 transformElement( background, '' ); 1840 } ); 1841 1842 transformSlides( { overview: '' } ); 1843 1844 slide( indexh, indexv ); 1845 1846 layout(); 1847 1848 cueAutoSlide(); 1849 1850 // Notify observers of the overview hiding 1851 dispatchEvent( 'overviewhidden', { 1852 'indexh': indexh, 1853 'indexv': indexv, 1854 'currentSlide': currentSlide 1855 } ); 1856 1857 } 1858 } 1859 1860 /** 1861 * Toggles the slide overview mode on and off. 1862 * 1863 * @param {Boolean} override Optional flag which overrides the 1864 * toggle logic and forcibly sets the desired state. True means 1865 * overview is open, false means it's closed. 1866 */ 1867 function toggleOverview( override ) { 1868 1869 if( typeof override === 'boolean' ) { 1870 override ? activateOverview() : deactivateOverview(); 1871 } 1872 else { 1873 isOverview() ? deactivateOverview() : activateOverview(); 1874 } 1875 1876 } 1877 1878 /** 1879 * Checks if the overview is currently active. 1880 * 1881 * @return {Boolean} true if the overview is active, 1882 * false otherwise 1883 */ 1884 function isOverview() { 1885 1886 return overview; 1887 1888 } 1889 1890 /** 1891 * Checks if the current or specified slide is vertical 1892 * (nested within another slide). 1893 * 1894 * @param {HTMLElement} slide [optional] The slide to check 1895 * orientation of 1896 */ 1897 function isVerticalSlide( slide ) { 1898 1899 // Prefer slide argument, otherwise use current slide 1900 slide = slide ? slide : currentSlide; 1901 1902 return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i ); 1903 1904 } 1905 1906 /** 1907 * Handling the fullscreen functionality via the fullscreen API 1908 * 1909 * @see http://fullscreen.spec.whatwg.org/ 1910 * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode 1911 */ 1912 function enterFullscreen() { 1913 1914 var element = document.body; 1915 1916 // Check which implementation is available 1917 var requestMethod = element.requestFullScreen || 1918 element.webkitRequestFullscreen || 1919 element.webkitRequestFullScreen || 1920 element.mozRequestFullScreen || 1921 element.msRequestFullscreen; 1922 1923 if( requestMethod ) { 1924 requestMethod.apply( element ); 1925 } 1926 1927 } 1928 1929 /** 1930 * Enters the paused mode which fades everything on screen to 1931 * black. 1932 */ 1933 function pause() { 1934 1935 if( config.pause ) { 1936 var wasPaused = dom.wrapper.classList.contains( 'paused' ); 1937 1938 cancelAutoSlide(); 1939 dom.wrapper.classList.add( 'paused' ); 1940 1941 if( wasPaused === false ) { 1942 dispatchEvent( 'paused' ); 1943 } 1944 } 1945 1946 } 1947 1948 /** 1949 * Exits from the paused mode. 1950 */ 1951 function resume() { 1952 1953 var wasPaused = dom.wrapper.classList.contains( 'paused' ); 1954 dom.wrapper.classList.remove( 'paused' ); 1955 1956 cueAutoSlide(); 1957 1958 if( wasPaused ) { 1959 dispatchEvent( 'resumed' ); 1960 } 1961 1962 } 1963 1964 /** 1965 * Toggles the paused mode on and off. 1966 */ 1967 function togglePause( override ) { 1968 1969 if( typeof override === 'boolean' ) { 1970 override ? pause() : resume(); 1971 } 1972 else { 1973 isPaused() ? resume() : pause(); 1974 } 1975 1976 } 1977 1978 /** 1979 * Checks if we are currently in the paused mode. 1980 */ 1981 function isPaused() { 1982 1983 return dom.wrapper.classList.contains( 'paused' ); 1984 1985 } 1986 1987 /** 1988 * Toggles the auto slide mode on and off. 1989 * 1990 * @param {Boolean} override Optional flag which sets the desired state. 1991 * True means autoplay starts, false means it stops. 1992 */ 1993 1994 function toggleAutoSlide( override ) { 1995 1996 if( typeof override === 'boolean' ) { 1997 override ? resumeAutoSlide() : pauseAutoSlide(); 1998 } 1999 2000 else { 2001 autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); 2002 } 2003 2004 } 2005
2006 /** 2007 * Checks if the auto slide mode is currently on. 2008 */ 2009 function isAutoSliding() { 2010 2011 return !!( autoSlide && !autoSlidePaused ); 2012 2013 } 2014 2015 /** 2016 * Steps from the current point in the presentation to the 2017 * slide which matches the specified horizontal and vertical 2018 * indices. 2019 * 2020 * @param {int} h Horizontal index of the target slide 2021 * @param {int} v Vertical index of the target slide 2022 * @param {int} f Optional index of a fragment within the 2023 * target slide to activate 2024 * @param {int} o Optional origin for use in multimaster environments 2025 */ 2026 function slide( h, v, f, o ) { 2027 2028 // Remember where we were at before 2029 previousSlide = currentSlide; 2030 2031 // Query all horizontal slides in the deck 2032 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); 2033 2034 // If no vertical index is specified and the upcoming slide is a 2035 // stack, resume at its previous vertical index 2036 if( v === undefined && !isOverview() ) { 2037 v = getPreviousVerticalIndex( horizontalSlides[ h ] ); 2038 } 2039 2040 // If we were on a vertical stack, remember what vertical index 2041 // it was on so we can resume at the same position when returning 2042 if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) { 2043 setPreviousVerticalIndex( previousSlide.parentNode, indexv ); 2044 } 2045 2046 // Remember the state before this slide 2047 var stateBefore = state.concat(); 2048 2049 // Reset the state array 2050 state.length = 0; 2051 2052 var indexhBefore = indexh || 0, 2053 indexvBefore = indexv || 0; 2054 2055 // Activate and transition to the new slide 2056 indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h ); 2057 indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v ); 2058 2059 // Update the visibility of slides now that the indices have changed 2060 updateSlidesVisibility(); 2061 2062 layout(); 2063 2064 // Apply the new state 2065 stateLoop: for( var i = 0, len = state.length; i < len; i++ ) { 2066 // Check if this state existed on the previous slide. If it 2067 // did, we will avoid adding it repeatedly 2068 for( var j = 0; j < stateBefore.length; j++ ) { 2069 if( stateBefore[j] === state[i] ) { 2070 stateBefore.splice( j, 1 ); 2071 continue stateLoop; 2072 } 2073 } 2074 2075 document.documentElement.classList.add( state[i] ); 2076 2077 // Dispatch custom event matching the state's name 2078 dispatchEvent( state[i] ); 2079 } 2080 2081 // Clean up the remains of the previous state 2082 while( stateBefore.length ) { 2083 document.documentElement.classList.remove( stateBefore.pop() ); 2084 } 2085 2086 // Update the overview if it's currently active 2087 if( isOverview() ) { 2088 updateOverview(); 2089 } 2090 2091 // Find the current horizontal slide and any possible vertical slides 2092 // within it 2093 var currentHorizontalSlide = horizontalSlides[ indexh ], 2094 currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' ); 2095 2096 // Store references to the previous and current slides 2097 currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide; 2098 2099 // Show fragment, if specified 2100 if( typeof f !== 'undefined' ) { 2101 navigateFragment( f ); 2102 } 2103 2104 // Dispatch an event if the slide changed 2105 var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); 2106 if( slideChanged ) { 2107 dispatchEvent( 'slidechanged', { 2108 'indexh': indexh, 2109 'indexv': indexv, 2110 'previousSlide': previousSlide, 2111 'currentSlide': currentSlide, 2112 'origin': o 2113 } ); 2114 } 2115 else { 2116 // Ensure that the previous slide is never the same as the current 2117 previousSlide = null; 2118 } 2119 2120 // Solves an edge case where the previous slide maintains the 2121 // 'present' class when navigating between adjacent vertical 2122 // stacks 2123 if( previousSlide ) { 2124 previousSlide.classList.remove( 'present' ); 2125 previousSlide.setAttribute( 'aria-hidden', 'true' ); 2126 2127 // Reset all slides upon navigate to home 2128 // Issue: #285 2129 if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) { 2130 // Launch async task 2131 setTimeout( function () { 2132 var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i; 2133 for( i in slides ) { 2134 if( slides[i] ) { 2135 // Reset stack 2136 setPreviousVerticalIndex( slides[i], 0 ); 2137 } 2138 } 2139 }, 0 ); 2140 } 2141 } 2142 2143 // Handle embedded content 2144 if( slideChanged || !previousSlide ) { 2145 stopEmbeddedContent( previousSlide ); 2146 startEmbeddedContent( currentSlide ); 2147 } 2148 2149 // Announce the current slide contents, for screen readers 2150 dom.statusDiv.textContent = currentSlide.textContent; 2151 2152 updateControls(); 2153 updateProgress();
2154 updateBackground(); 2155 updateParallax(); 2156 updateSlideNumber(); 2157 2158 // Update the URL hash 2159 writeURL(); 2160 2161 cueAutoSlide(); 2162 2163 } 2164 2165 /** 2166 * Syncs the presentation with the current DOM. Useful 2167 * when new slides or control elements are added or when 2168 * the configuration has changed. 2169 */ 2170 function sync() { 2171 2172 // Subscribe to input 2173 removeEventListeners(); 2174 addEventListeners(); 2175 2176 // Force a layout to make sure the current config is accounted for 2177 layout(); 2178 2179 // Reflect the current autoSlide value 2180 autoSlide = config.autoSlide; 2181 2182 // Start auto-sliding if it's enabled 2183 cueAutoSlide(); 2184 2185 // Re-create the slide backgrounds 2186 createBackgrounds(); 2187 2188 // Write the current hash to the URL 2189 writeURL(); 2190 2191 sortAllFragments(); 2192 2193 updateControls(); 2194 updateProgress(); 2195 updateBackground( true ); 2196 updateSlideNumber(); 2197 updateSlidesVisibility(); 2198 2199 formatEmbeddedContent(); 2200 startEmbeddedContent( currentSlide ); 2201 2202 if( isOverview() ) { 2203 layoutOverview(); 2204 } 2205 2206 } 2207 2208 /** 2209 * Resets all vertical slides so that only the first 2210 * is visible. 2211 */ 2212 function resetVerticalSlides() { 2213 2214 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2215 horizontalSlides.forEach( function( horizontalSlide ) { 2216 2217 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 2218 verticalSlides.forEach( function( verticalSlide, y ) { 2219 2220 if( y > 0 ) { 2221 verticalSlide.classList.remove( 'present' ); 2222 verticalSlide.classList.remove( 'past' ); 2223 verticalSlide.classList.add( 'future' ); 2224 verticalSlide.setAttribute( 'aria-hidden', 'true' ); 2225 } 2226 2227 } ); 2228 2229 } ); 2230 2231 } 2232 2233 /** 2234 * Sorts and formats all of fragments in the 2235 * presentation. 2236 */ 2237 function sortAllFragments() { 2238 2239 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2240 horizontalSlides.forEach( function( horizontalSlide ) { 2241 2242 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 2243 verticalSlides.forEach( function( verticalSlide, y ) { 2244 2245 sortFragments( verticalSlide.querySelectorAll( '.fragment' ) ); 2246 2247 } ); 2248 2249 if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) ); 2250 2251 } ); 2252 2253 } 2254 2255 /** 2256 * Updates one dimension of slides by showing the slide 2257 * with the specified index. 2258 * 2259 * @param {String} selector A CSS selector that will fetch 2260 * the group of slides we are working with 2261 * @param {Number} index The index of the slide that should be 2262 * shown 2263 * 2264 * @return {Number} The index of the slide that is now shown, 2265 * might differ from the passed in index if it was out of 2266 * bounds. 2267 */ 2268 function updateSlides( selector, index ) { 2269 2270 // Select all slides and convert the NodeList result to 2271 // an array 2272 var slides = toArray( dom.wrapper.querySelectorAll( selector ) ), 2273 slidesLength = slides.length; 2274 2275 var printMode = isPrintingPDF(); 2276 2277 if( slidesLength ) { 2278 2279 // Should the index loop? 2280 if( config.loop ) { 2281 index %= slidesLength; 2282 2283 if( index < 0 ) { 2284 index = slidesLength + index; 2285 } 2286 } 2287 2288 // Enforce max and minimum index bounds 2289 index = Math.max( Math.min( index, slidesLength - 1 ), 0 ); 2290 2291 for( var i = 0; i < slidesLength; i++ ) { 2292 var element = slides[i]; 2293 2294 var reverse = config.rtl && !isVerticalSlide( element ); 2295 2296 element.classList.remove( 'past' ); 2297 element.classList.remove( 'present' ); 2298 element.classList.remove( 'future' ); 2299 2300 // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute 2301 element.setAttribute( 'hidden', '' ); 2302 element.setAttribute( 'aria-hidden', 'true' ); 2303 2304 // If this element contains vertical slides 2305 if( element.querySelector( 'section' ) ) { 2306 element.classList.add( 'stack' ); 2307 } 2308 2309 // If we're printing static slides, all slides are "present" 2310 if( printMode ) { 2311 element.classList.add( 'present' ); 2312 continue; 2313 } 2314 2315 if( i < index ) { 2316 // Any element previous to index is given the 'past' class 2317 element.classList.add( reverse ? 'future' : 'past' ); 2318 2319 if( config.fragments ) { 2320 var pastFragments = toArray( element.querySelectorAll( '.fragment' ) ); 2321 2322 // Show all fragments on prior slides 2323 while( pastFragments.length ) { 2324 var pastFragment = pastFragments.pop(); 2325 pastFragment.classList.add( 'visible' ); 2326 pastFragment.classList.remove( 'current-fragment' ); 2327 } 2328 } 2329 } 2330 else if( i > index ) { 2331 // Any element subsequent to index is given the 'future' class 2332 element.classList.add( reverse ? 'past' : 'future' ); 2333 2334 if( config.fragments ) { 2335 var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) ); 2336 2337 // No fragments in future slides should be visible ahead of time 2338 while( futureFragments.length ) { 2339 var futureFragment = futureFragments.pop(); 2340 futureFragment.classList.remove( 'visible' ); 2341 futureFragment.classList.remove( 'current-fragment' ); 2342 } 2343 } 2344 } 2345 } 2346 2347 // Mark the current slide as present 2348 slides[index].classList.add( 'present' ); 2349 slides[index].removeAttribute( 'hidden' ); 2350 slides[index].removeAttribute( 'aria-hidden' ); 2351 2352 // If this slide has a state associated with it, add it 2353 // onto the current state of the deck 2354 var slideState = slides[index].getAttribute( 'data-state' ); 2355 if( slideState ) { 2356 state = state.concat( slideState.split( ' ' ) ); 2357 } 2358 2359 } 2360 else { 2361 // Since there are no slides we can't be anywhere beyond the 2362 // zeroth index 2363 index = 0; 2364 } 2365 2366 return index; 2367 2368 } 2369
2370 /** 2371 * Optimization method; hide all slides that are far away 2372 * from the present slide. 2373 */ 2374 function updateSlidesVisibility() { 2375 2376 // Select all slides and convert the NodeList result to 2377 // an array 2378 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ), 2379 horizontalSlidesLength = horizontalSlides.length, 2380 distanceX, 2381 distanceY; 2382 2383 if( horizontalSlidesLength && typeof indexh !== 'undefined' ) { 2384 2385 // The number of steps away from the present slide that will 2386 // be visible 2387 var viewDistance = isOverview() ? 10 : config.viewDistance; 2388 2389 // Limit view distance on weaker devices 2390 if( isMobileDevice ) { 2391 viewDistance = isOverview() ? 6 : 2; 2392 } 2393 2394 // All slides need to be visible when exporting to PDF 2395 if( isPrintingPDF() ) { 2396 viewDistance = Number.MAX_VALUE; 2397 } 2398 2399 for( var x = 0; x < horizontalSlidesLength; x++ ) { 2400 var horizontalSlide = horizontalSlides[x]; 2401 2402 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), 2403 verticalSlidesLength = verticalSlides.length; 2404 2405 // Determine how far away this slide is from the present 2406 distanceX = Math.abs( ( indexh || 0 ) - x ) || 0; 2407 2408 // If the presentation is looped, distance should measure 2409 // 1 between the first and last slides 2410 if( config.loop ) { 2411 distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0; 2412 } 2413 2414 // Show the horizontal slide if it's within the view distance 2415 if( distanceX < viewDistance ) { 2416 showSlide( horizontalSlide ); 2417 } 2418 else { 2419 hideSlide( horizontalSlide ); 2420 } 2421 2422 if( verticalSlidesLength ) { 2423 2424 var oy = getPreviousVerticalIndex( horizontalSlide ); 2425 2426 for( var y = 0; y < verticalSlidesLength; y++ ) { 2427 var verticalSlide = verticalSlides[y]; 2428 2429 distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy ); 2430 2431 if( distanceX + distanceY < viewDistance ) { 2432 showSlide( verticalSlide ); 2433 } 2434 else { 2435 hideSlide( verticalSlide ); 2436 } 2437 } 2438 2439 } 2440 } 2441 2442 } 2443 2444 } 2445 2446 /** 2447 * Updates the progress bar to reflect the current slide. 2448 */ 2449 function updateProgress() { 2450 2451 // Update progress if enabled 2452 if( config.progress && dom.progressbar ) { 2453 2454 dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px'; 2455 2456 } 2457 2458 } 2459 2460 /** 2461 * Updates the slide number div to reflect the current slide. 2462 * 2463 * Slide number format can be defined as a string using the 2464 * following variables: 2465 * h: current slide's horizontal index 2466 * v: current slide's vertical index 2467 * c: current slide index (flattened) 2468 * t: total number of slides (flattened) 2469 */ 2470 function updateSlideNumber() { 2471 2472 // Update slide number if enabled 2473 if( config.slideNumber && dom.slideNumber) { 2474 2475 // Default to only showing the current slide number 2476 var format = 'c'; 2477 2478 // Check if a custom slide number format is available 2479 if( typeof config.slideNumber === 'string' ) { 2480 format = config.slideNumber; 2481 } 2482 2483 dom.slideNumber.innerHTML = format.replace( /h/g, indexh ) 2484 .replace( /v/g, indexv ) 2485 .replace( /c/g, getSlidePastCount() + 1 ) 2486 .replace( /t/g, getTotalSlides() ); 2487 } 2488 2489 } 2490 2491 /** 2492 * Updates the state of all control/navigation arrows. 2493 */ 2494 function updateControls() { 2495 2496 var routes = availableRoutes(); 2497 var fragments = availableFragments(); 2498 2499 // Remove the 'enabled' class from all directions 2500 dom.controlsLeft.concat( dom.controlsRight ) 2501 .concat( dom.controlsUp ) 2502 .concat( dom.controlsDown ) 2503 .concat( dom.controlsPrev ) 2504 .concat( dom.controlsNext ).forEach( function( node ) { 2505 node.classList.remove( 'enabled' ); 2506 node.classList.remove( 'fragmented' ); 2507 } ); 2508 2509 // Add the 'enabled' class to the available routes 2510 if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2511 if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2512 if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2513 if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2514 2515 // Prev/next buttons 2516 if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2517 if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2518 2519 // Highlight fragment directions 2520 if( currentSlide ) { 2521 2522 // Always apply fragment decorator to prev/next buttons 2523 if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2524 if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2525 2526 // Apply fragment decorators to directional buttons based on 2527 // what slide axis they are in 2528 if( isVerticalSlide( currentSlide ) ) {
2529 if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2530 if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2531 } 2532 else { 2533 if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2534 if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2535 } 2536 2537 } 2538 2539 } 2540 2541 /** 2542 * Updates the background elements to reflect the current 2543 * slide. 2544 * 2545 * @param {Boolean} includeAll If true, the backgrounds of 2546 * all vertical slides (not just the present) will be updated. 2547 */ 2548 function updateBackground( includeAll ) { 2549 2550 var currentBackground = null; 2551 2552 // Reverse past/future classes when in RTL mode 2553 var horizontalPast = config.rtl ? 'future' : 'past', 2554 horizontalFuture = config.rtl ? 'past' : 'future'; 2555 2556 // Update the classes of all backgrounds to match the 2557 // states of their slides (past/present/future) 2558 toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) { 2559 2560 backgroundh.classList.remove( 'past' ); 2561 backgroundh.classList.remove( 'present' ); 2562 backgroundh.classList.remove( 'future' ); 2563 2564 if( h < indexh ) { 2565 backgroundh.classList.add( horizontalPast ); 2566 } 2567 else if ( h > indexh ) { 2568 backgroundh.classList.add( horizontalFuture ); 2569 } 2570 else { 2571 backgroundh.classList.add( 'present' ); 2572 2573 // Store a reference to the current background element 2574 currentBackground = backgroundh; 2575 } 2576 2577 if( includeAll || h === indexh ) { 2578 toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) { 2579 2580 backgroundv.classList.remove( 'past' ); 2581 backgroundv.classList.remove( 'present' ); 2582 backgroundv.classList.remove( 'future' ); 2583 2584 if( v < indexv ) { 2585 backgroundv.classList.add( 'past' ); 2586 } 2587 else if ( v > indexv ) { 2588 backgroundv.classList.add( 'future' ); 2589 } 2590 else { 2591 backgroundv.classList.add( 'present' ); 2592 2593 // Only if this is the present horizontal and vertical slide 2594 if( h === indexh ) currentBackground = backgroundv; 2595 } 2596 2597 } ); 2598 } 2599 2600 } ); 2601 2602 // Stop any currently playing video background 2603 if( previousBackground ) { 2604 2605 var previousVideo = previousBackground.querySelector( 'video' ); 2606 if( previousVideo ) previousVideo.pause(); 2607 2608 } 2609 2610 if( currentBackground ) { 2611 2612 // Start video playback 2613 var currentVideo = currentBackground.querySelector( 'video' ); 2614 if( currentVideo ) { 2615 currentVideo.currentTime = 0; 2616 currentVideo.play(); 2617 } 2618 2619 var backgroundImageURL = currentBackground.style.backgroundImage || ''; 2620 2621 // Restart GIFs (doesn't work in Firefox) 2622 if( /\.gif/i.test( backgroundImageURL ) ) { 2623 currentBackground.style.backgroundImage = ''; 2624 window.getComputedStyle( currentBackground ).opacity; 2625 currentBackground.style.backgroundImage = backgroundImageURL; 2626 } 2627 2628 // Don't transition between identical backgrounds. This 2629 // prevents unwanted flicker. 2630 var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null; 2631 var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' ); 2632 if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) { 2633 dom.background.classList.add( 'no-transition' ); 2634 } 2635 2636 previousBackground = currentBackground; 2637 2638 } 2639 2640 // If there's a background brightness flag for this slide, 2641 // bubble it to the .reveal container 2642 if( currentSlide ) { 2643 [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) { 2644 if( currentSlide.classList.contains( classToBubble ) ) { 2645 dom.wrapper.classList.add( classToBubble ); 2646 } 2647 else { 2648 dom.wrapper.classList.remove( classToBubble ); 2649 } 2650 } ); 2651 } 2652 2653 // Allow the first background to apply without transition 2654 setTimeout( function() { 2655 dom.background.classList.remove( 'no-transition' ); 2656 }, 1 ); 2657 2658 } 2659
2660 /** 2661 * Updates the position of the parallax background based 2662 * on the current slide index. 2663 */ 2664 function updateParallax() { 2665 2666 if( config.parallaxBackgroundImage ) { 2667 2668 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), 2669 verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); 2670 2671 var backgroundSize = dom.background.style.backgroundSize.split( ' ' ), 2672 backgroundWidth, backgroundHeight; 2673 2674 if( backgroundSize.length === 1 ) { 2675 backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 ); 2676 } 2677 else { 2678 backgroundWidth = parseInt( backgroundSize[0], 10 ); 2679 backgroundHeight = parseInt( backgroundSize[1], 10 ); 2680 } 2681 2682 var slideWidth = dom.background.offsetWidth, 2683 horizontalSlideCount = horizontalSlides.length, 2684 horizontalOffsetMultiplier, 2685 horizontalOffset; 2686 2687 if( typeof config.parallaxBackgroundHorizontal === 'number' ) { 2688 horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal; 2689 } 2690 else { 2691 horizontalOffsetMultiplier = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ); 2692 } 2693 2694 horizontalOffset = horizontalOffsetMultiplier * indexh * -1; 2695 2696 var slideHeight = dom.background.offsetHeight, 2697 verticalSlideCount = verticalSlides.length, 2698 verticalOffsetMultiplier, 2699 verticalOffset; 2700 2701 if( typeof config.parallaxBackgroundVertical === 'number' ) { 2702 verticalOffsetMultiplier = config.parallaxBackgroundVertical; 2703 } 2704 else { 2705 verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ); 2706 } 2707 2708 verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0; 2709 2710 dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px'; 2711 2712 } 2713 2714 } 2715 2716 /** 2717 * Called when the given slide is within the configured view 2718 * distance. Shows the slide element and loads any content 2719 * that is set to load lazily (data-src). 2720 */ 2721 function showSlide( slide ) { 2722 2723 // Show the slide element 2724 slide.style.display = 'block'; 2725 2726 // Media elements with data-src attributes 2727 toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) { 2728 element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); 2729 element.removeAttribute( 'data-src' ); 2730 } ); 2731 2732 // Media elements with <source> children 2733 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) { 2734 var sources = 0; 2735 2736 toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) { 2737 source.setAttribute( 'src', source.getAttribute( 'data-src' ) ); 2738 source.removeAttribute( 'data-src' ); 2739 sources += 1; 2740 } ); 2741 2742 // If we rewrote sources for this video/audio element, we need 2743 // to manually tell it to load from its new origin 2744 if( sources > 0 ) { 2745 media.load(); 2746 } 2747 } ); 2748 2749 2750 // Show the corresponding background element 2751 var indices = getIndices( slide ); 2752 var background = getSlideBackground( indices.h, indices.v ); 2753 if( background ) { 2754 background.style.display = 'block'; 2755 2756 // If the background contains media, load it 2757 if( background.hasAttribute( 'data-loaded' ) === false ) { 2758 background.setAttribute( 'data-loaded', 'true' ); 2759 2760 var backgroundImage = slide.getAttribute( 'data-background-image' ), 2761 backgroundVideo = slide.getAttribute( 'data-background-video' ), 2762 backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ), 2763 backgroundIframe = slide.getAttribute( 'data-background-iframe' ); 2764 2765 // Images 2766 if( backgroundImage ) { 2767 background.style.backgroundImage = 'url('+ backgroundImage +')'; 2768 } 2769 // Videos 2770 else if ( backgroundVideo && !isSpeakerNotes() ) { 2771 var video = document.createElement( 'video' ); 2772 2773 if( backgroundVideoLoop ) { 2774 video.setAttribute( 'loop', '' ); 2775 } 2776 2777 // Support comma separated lists of video sources 2778 backgroundVideo.split( ',' ).forEach( function( source ) { 2779 video.innerHTML += '<source src="'+ source +'">'; 2780 } ); 2781 2782 background.appendChild( video ); 2783 } 2784 // Iframes 2785 else if( backgroundIframe ) { 2786 var iframe = document.createElement( 'iframe' ); 2787 iframe.setAttribute( 'src', backgroundIframe ); 2788 iframe.style.width = '100%'; 2789 iframe.style.height = '100%'; 2790 iframe.style.maxHeight = '100%'; 2791 iframe.style.maxWidth = '100%'; 2792 2793 background.appendChild( iframe ); 2794 } 2795 } 2796 } 2797 2798 } 2799
2800 /** 2801 * Called when the given slide is moved outside of the 2802 * configured view distance. 2803 */ 2804 function hideSlide( slide ) { 2805 2806 // Hide the slide element 2807 slide.style.display = 'none'; 2808 2809 // Hide the corresponding background element 2810 var indices = getIndices( slide ); 2811 var background = getSlideBackground( indices.h, indices.v ); 2812 if( background ) { 2813 background.style.display = 'none'; 2814 } 2815 2816 } 2817 2818 /** 2819 * Determine what available routes there are for navigation. 2820 * 2821 * @return {Object} containing four booleans: left/right/up/down 2822 */ 2823 function availableRoutes() { 2824 2825 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), 2826 verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); 2827 2828 var routes = { 2829 left: indexh > 0 || config.loop, 2830 right: indexh < horizontalSlides.length - 1 || config.loop, 2831 up: indexv > 0, 2832 down: indexv < verticalSlides.length - 1 2833 }; 2834 2835 // reverse horizontal controls for rtl 2836 if( config.rtl ) { 2837 var left = routes.left; 2838 routes.left = routes.right; 2839 routes.right = left; 2840 } 2841 2842 return routes; 2843 2844 } 2845 2846 /** 2847 * Returns an object describing the available fragment 2848 * directions. 2849 * 2850 * @return {Object} two boolean properties: prev/next 2851 */ 2852 function availableFragments() { 2853 2854 if( currentSlide && config.fragments ) { 2855 var fragments = currentSlide.querySelectorAll( '.fragment' ); 2856 var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' ); 2857 2858 return { 2859 prev: fragments.length - hiddenFragments.length > 0, 2860 next: !!hiddenFragments.length 2861 }; 2862 } 2863 else { 2864 return { prev: false, next: false }; 2865 } 2866 2867 } 2868 2869 /** 2870 * Enforces origin-specific format rules for embedded media. 2871 */ 2872 function formatEmbeddedContent() { 2873 2874 var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) { 2875 toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) { 2876 var src = el.getAttribute( sourceAttribute ); 2877 if( src && src.indexOf( param ) === -1 ) { 2878 el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param ); 2879 } 2880 }); 2881 }; 2882 2883 // YouTube frames must include "?enablejsapi=1" 2884 _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' ); 2885 _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' ); 2886 2887 // Vimeo frames must include "?api=1" 2888 _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' ); 2889 _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' ); 2890 2891 } 2892 2893 /** 2894 * Start playback of any embedded content inside of 2895 * the targeted slide. 2896 */ 2897 function startEmbeddedContent( slide ) { 2898 2899 if( slide && !isSpeakerNotes() ) { 2900 // Restart GIFs 2901 toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) { 2902 // Setting the same unchanged source like this was confirmed 2903 // to work in Chrome, FF & Safari 2904 el.setAttribute( 'src', el.getAttribute( 'src' ) ); 2905 } ); 2906 2907 // HTML5 media elements 2908 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 2909 if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) { 2910 el.play(); 2911 } 2912 } ); 2913 2914 // Normal iframes 2915 toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) { 2916 startEmbeddedIframe( { target: el } ); 2917 } ); 2918 2919 // Lazy loading iframes 2920 toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { 2921 if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) { 2922 el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes 2923 el.addEventListener( 'load', startEmbeddedIframe ); 2924 el.setAttribute( 'src', el.getAttribute( 'data-src' ) ); 2925 } 2926 } ); 2927 } 2928 2929 } 2930 2931 /** 2932 * "Starts" the content of an embedded iframe using the 2933 * postmessage API. 2934 */ 2935 function startEmbeddedIframe( event ) { 2936 2937 var iframe = event.target; 2938 2939 // YouTube postMessage API 2940 if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { 2941 iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); 2942 } 2943 // Vimeo postMessage API 2944 else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { 2945 iframe.contentWindow.postMessage( '{"method":"play"}', '*' ); 2946 } 2947 // Generic postMessage API 2948 else { 2949 iframe.contentWindow.postMessage( 'slide:start', '*' ); 2950 } 2951 2952 } 2953
2954 /** 2955 * Stop playback of any embedded content inside of 2956 * the targeted slide. 2957 */ 2958 function stopEmbeddedContent( slide ) { 2959 2960 if( slide && slide.parentNode ) { 2961 // HTML5 media elements 2962 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 2963 if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) { 2964 el.pause(); 2965 } 2966 } ); 2967 2968 // Generic postMessage API for non-lazy loaded iframes 2969 toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) { 2970 el.contentWindow.postMessage( 'slide:stop', '*' ); 2971 el.removeEventListener( 'load', startEmbeddedIframe ); 2972 }); 2973 2974 // YouTube postMessage API 2975 toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { 2976 if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) { 2977 el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' ); 2978 } 2979 }); 2980 2981 // Vimeo postMessage API 2982 toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { 2983 if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) { 2984 el.contentWindow.postMessage( '{"method":"pause"}', '*' ); 2985 } 2986 }); 2987 2988 // Lazy loading iframes 2989 toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { 2990 // Only removing the src doesn't actually unload the frame 2991 // in all browsers (Firefox) so we set it to blank first 2992 el.setAttribute( 'src', 'about:blank' ); 2993 el.removeAttribute( 'src' ); 2994 } ); 2995 } 2996 2997 } 2998 2999 /** 3000 * Returns the number of past slides. This can be used as a global 3001 * flattened index for slides. 3002 */ 3003 function getSlidePastCount() { 3004 3005 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 3006 3007 // The number of past slides 3008 var pastCount = 0; 3009 3010 // Step through all slides and count the past ones 3011 mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) { 3012 3013 var horizontalSlide = horizontalSlides[i]; 3014 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 3015 3016 for( var j = 0; j < verticalSlides.length; j++ ) { 3017 3018 // Stop as soon as we arrive at the present 3019 if( verticalSlides[j].classList.contains( 'present' ) ) { 3020 break mainLoop; 3021 } 3022 3023 pastCount++; 3024 3025 } 3026 3027 // Stop as soon as we arrive at the present 3028 if( horizontalSlide.classList.contains( 'present' ) ) { 3029 break; 3030 } 3031 3032 // Don't count the wrapping section for vertical slides 3033 if( horizontalSlide.classList.contains( 'stack' ) === false ) { 3034 pastCount++; 3035 } 3036 3037 } 3038 3039 return pastCount; 3040 3041 } 3042
3043 /** 3044 * Returns a value ranging from 0-1 that represents 3045 * how far into the presentation we have navigated. 3046 */ 3047 function getProgress() { 3048 3049 // The number of past and total slides 3050 var totalCount = getTotalSlides(); 3051 var pastCount = getSlidePastCount(); 3052 3053 if( currentSlide ) { 3054 3055 var allFragments = currentSlide.querySelectorAll( '.fragment' ); 3056 3057 // If there are fragments in the current slide those should be 3058 // accounted for in the progress. 3059 if( allFragments.length > 0 ) { 3060 var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' ); 3061 3062 // This value represents how big a portion of the slide progress 3063 // that is made up by its fragments (0-1) 3064 var fragmentWeight = 0.9; 3065 3066 // Add fragment progress to the past slide count 3067 pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight; 3068 } 3069 3070 } 3071 3072 return pastCount / ( totalCount - 1 ); 3073 3074 } 3075 3076 /** 3077 * Checks if this presentation is running inside of the 3078 * speaker notes window. 3079 */ 3080 function isSpeakerNotes() { 3081 3082 return !!window.location.search.match( /receiver/gi ); 3083 3084 } 3085 3086 /** 3087 * Reads the current URL (hash) and navigates accordingly. 3088 */ 3089 function readURL() { 3090 3091 var hash = window.location.hash; 3092 3093 // Attempt to parse the hash as either an index or name 3094 var bits = hash.slice( 2 ).split( '/' ), 3095 name = hash.replace( /#|\//gi, '' ); 3096 3097 // If the first bit is invalid and there is a name we can 3098 // assume that this is a named link 3099 if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) { 3100 var element; 3101 3102 // Ensure the named link is a valid HTML ID attribute 3103 if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) { 3104 // Find the slide with the specified ID 3105 element = document.getElementById( name ); 3106 } 3107 3108 if( element ) { 3109 // Find the position of the named slide and navigate to it 3110 var indices = Reveal.getIndices( element ); 3111 slide( indices.h, indices.v ); 3112 } 3113 // If the slide doesn't exist, navigate to the current slide 3114 else { 3115 slide( indexh || 0, indexv || 0 ); 3116 } 3117 } 3118 else { 3119 // Read the index components of the hash 3120 var h = parseInt( bits[0], 10 ) || 0, 3121 v = parseInt( bits[1], 10 ) || 0; 3122 3123 if( h !== indexh || v !== indexv ) { 3124 slide( h, v ); 3125 } 3126 } 3127 3128 } 3129 3130 /** 3131 * Updates the page URL (hash) to reflect the current 3132 * state. 3133 * 3134 * @param {Number} delay The time in ms to wait before 3135 * writing the hash 3136 */ 3137 function writeURL( delay ) { 3138 3139 if( config.history ) { 3140 3141 // Make sure there's never more than one timeout running 3142 clearTimeout( writeURLTimeout ); 3143 3144 // If a delay is specified, timeout this call 3145 if( typeof delay === 'number' ) { 3146 writeURLTimeout = setTimeout( writeURL, delay ); 3147 } 3148 else if( currentSlide ) { 3149 var url = '/'; 3150 3151 // Attempt to create a named link based on the slide's ID 3152 var id = currentSlide.getAttribute( 'id' ); 3153 if( id ) { 3154 id = id.toLowerCase(); 3155 id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' ); 3156 } 3157 3158 // If the current slide has an ID, use that as a named link 3159 if( typeof id === 'string' && id.length ) { 3160 url = '/' + id; 3161 } 3162 // Otherwise use the /h/v index 3163 else { 3164 if( indexh > 0 || indexv > 0 ) url += indexh; 3165 if( indexv > 0 ) url += '/' + indexv; 3166 } 3167 3168 window.location.hash = url; 3169 } 3170 } 3171 3172 } 3173 3174 /** 3175 * Retrieves the h/v location of the current, or specified, 3176 * slide. 3177 * 3178 * @param {HTMLElement} slide If specified, the returned 3179 * index will be for this slide rather than the currently 3180 * active one 3181 * 3182 * @return {Object} { h: <int>, v: <int>, f: <int> } 3183 */ 3184 function getIndices( slide ) { 3185 3186 // By default, return the current indices 3187 var h = indexh, 3188 v = indexv, 3189 f; 3190 3191 // If a slide is specified, return the indices of that slide 3192 if( slide ) { 3193 var isVertical = isVerticalSlide( slide ); 3194 var slideh = isVertical ? slide.parentNode : slide; 3195 3196 // Select all horizontal slides 3197 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 3198
3199 // Now that we know which the horizontal slide is, get its index 3200 h = Math.max( horizontalSlides.indexOf( slideh ), 0 ); 3201 3202 // Assume we're not vertical 3203 v = undefined; 3204 3205 // If this is a vertical slide, grab the vertical index 3206 if( isVertical ) { 3207 v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 ); 3208 } 3209 } 3210 3211 if( !slide && currentSlide ) { 3212 var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0; 3213 if( hasFragments ) { 3214 var currentFragment = currentSlide.querySelector( '.current-fragment' ); 3215 if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) { 3216 f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 ); 3217 } 3218 else { 3219 f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1; 3220 } 3221 } 3222 } 3223 3224 return { h: h, v: v, f: f }; 3225 3226 } 3227 3228 /** 3229 * Retrieves the total number of slides in this presentation. 3230 */ 3231 function getTotalSlides() { 3232 3233 return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length; 3234 3235 } 3236 3237 /** 3238 * Returns the slide element matching the specified index. 3239 */ 3240 function getSlide( x, y ) { 3241 3242 var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ]; 3243 var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' ); 3244 3245 if( verticalSlides && verticalSlides.length && typeof y === 'number' ) { 3246 return verticalSlides ? verticalSlides[ y ] : undefined; 3247 } 3248 3249 return horizontalSlide; 3250 3251 } 3252 3253 /** 3254 * Returns the background element for the given slide. 3255 * All slides, even the ones with no background properties 3256 * defined, have a background element so as long as the 3257 * index is valid an element will be returned. 3258 */ 3259 function getSlideBackground( x, y ) { 3260 3261 // When printing to PDF the slide backgrounds are nested 3262 // inside of the slides 3263 if( isPrintingPDF() ) { 3264 var slide = getSlide( x, y ); 3265 if( slide ) { 3266 var background = slide.querySelector( '.slide-background' ); 3267 if( background && background.parentNode === slide ) { 3268 return background; 3269 } 3270 } 3271 3272 return undefined; 3273 } 3274 3275 var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ]; 3276 var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' ); 3277 3278 if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) { 3279 return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined; 3280 } 3281 3282 return horizontalBackground; 3283 3284 } 3285 3286 /** 3287 * Retrieves the current state of the presentation as 3288 * an object. This state can then be restored at any 3289 * time. 3290 */ 3291 function getState() { 3292 3293 var indices = getIndices(); 3294 3295 return { 3296 indexh: indices.h, 3297 indexv: indices.v, 3298 indexf: indices.f, 3299 paused: isPaused(), 3300 overview: isOverview() 3301 }; 3302 3303 } 3304 3305 /** 3306 * Restores the presentation to the given state. 3307 * 3308 * @param {Object} state As generated by getState() 3309 */ 3310 function setState( state ) { 3311 3312 if( typeof state === 'object' ) { 3313 slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) ); 3314 3315 var pausedFlag = deserialize( state.paused ), 3316 overviewFlag = deserialize( state.overview ); 3317 3318 if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) { 3319 togglePause( pausedFlag ); 3320 } 3321 3322 if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) { 3323 toggleOverview( overviewFlag ); 3324 } 3325 } 3326 3327 } 3328 3329 /** 3330 * Return a sorted fragments list, ordered by an increasing 3331 * "data-fragment-index" attribute. 3332 * 3333 * Fragments will be revealed in the order that they are returned by 3334 * this function, so you can use the index attributes to control the 3335 * order of fragment appearance. 3336 * 3337 * To maintain a sensible default fragment order, fragments are presumed 3338 * to be passed in document order. This function adds a "fragment-index" 3339 * attribute to each node if such an attribute is not already present, 3340 * and sets that attribute to an integer value which is the position of 3341 * the fragment within the fragments list. 3342 */ 3343 function sortFragments( fragments ) { 3344 3345 fragments = toArray( fragments ); 3346 3347 var ordered = [], 3348 unordered = [], 3349 sorted = []; 3350 3351 // Group ordered and unordered elements
3352 fragments.forEach( function( fragment, i ) { 3353 if( fragment.hasAttribute( 'data-fragment-index' ) ) { 3354 var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 ); 3355 3356 if( !ordered[index] ) { 3357 ordered[index] = []; 3358 } 3359 3360 ordered[index].push( fragment ); 3361 } 3362 else { 3363 unordered.push( [ fragment ] ); 3364 } 3365 } ); 3366 3367 // Append fragments without explicit indices in their 3368 // DOM order 3369 ordered = ordered.concat( unordered ); 3370 3371 // Manually count the index up per group to ensure there 3372 // are no gaps 3373 var index = 0; 3374 3375 // Push all fragments in their sorted order to an array, 3376 // this flattens the groups 3377 ordered.forEach( function( group ) { 3378 group.forEach( function( fragment ) { 3379 sorted.push( fragment ); 3380 fragment.setAttribute( 'data-fragment-index', index ); 3381 } ); 3382 3383 index ++; 3384 } ); 3385 3386 return sorted; 3387 3388 } 3389 3390 /** 3391 * Navigate to the specified slide fragment. 3392 * 3393 * @param {Number} index The index of the fragment that 3394 * should be shown, -1 means all are invisible 3395 * @param {Number} offset Integer offset to apply to the 3396 * fragment index 3397 * 3398 * @return {Boolean} true if a change was made in any 3399 * fragments visibility as part of this call 3400 */ 3401 function navigateFragment( index, offset ) { 3402 3403 if( currentSlide && config.fragments ) { 3404 3405 var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) ); 3406 if( fragments.length ) { 3407 3408 // If no index is specified, find the current 3409 if( typeof index !== 'number' ) { 3410 var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop(); 3411 3412 if( lastVisibleFragment ) { 3413 index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 ); 3414 } 3415 else { 3416 index = -1; 3417 } 3418 } 3419 3420 // If an offset is specified, apply it to the index 3421 if( typeof offset === 'number' ) { 3422 index += offset; 3423 } 3424 3425 var fragmentsShown = [], 3426 fragmentsHidden = []; 3427 3428 toArray( fragments ).forEach( function( element, i ) { 3429 3430 if( element.hasAttribute( 'data-fragment-index' ) ) { 3431 i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 ); 3432 } 3433 3434 // Visible fragments 3435 if( i <= index ) { 3436 if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element ); 3437 element.classList.add( 'visible' ); 3438 element.classList.remove( 'current-fragment' ); 3439 3440 // Announce the fragments one by one to the Screen Reader 3441 dom.statusDiv.textContent = element.textContent; 3442 3443 if( i === index ) { 3444 element.classList.add( 'current-fragment' ); 3445 } 3446 } 3447 // Hidden fragments 3448 else { 3449 if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element ); 3450 element.classList.remove( 'visible' ); 3451 element.classList.remove( 'current-fragment' ); 3452 } 3453 3454 3455 } ); 3456 3457 if( fragmentsHidden.length ) { 3458 dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } ); 3459 } 3460 3461 if( fragmentsShown.length ) { 3462 dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } ); 3463 } 3464 3465 updateControls(); 3466 updateProgress(); 3467 3468 return !!( fragmentsShown.length || fragmentsHidden.length ); 3469 3470 } 3471 3472 } 3473 3474 return false; 3475 3476 } 3477 3478 /** 3479 * Navigate to the next slide fragment. 3480 * 3481 * @return {Boolean} true if there was a next fragment, 3482 * false otherwise 3483 */ 3484 function nextFragment() { 3485 3486 return navigateFragment( null, 1 ); 3487 3488 } 3489 3490 /** 3491 * Navigate to the previous slide fragment. 3492 * 3493 * @return {Boolean} true if there was a previous fragment, 3494 * false otherwise 3495 */ 3496 function previousFragment() { 3497 3498 return navigateFragment( null, -1 ); 3499 3500 } 3501 3502 /** 3503 * Cues a new automated slide if enabled in the config. 3504 */ 3505 function cueAutoSlide() { 3506 3507 cancelAutoSlide(); 3508 3509 if( currentSlide ) { 3510 3511 var currentFragment = currentSlide.querySelector( '.current-fragment' ); 3512 3513 var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null; 3514 var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null; 3515 var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' ); 3516 3517 // Pick value in the following priority order: 3518 // 1. Current fragment's data-autoslide 3519 // 2. Current slide's data-autoslide 3520 // 3. Parent slide's data-autoslide 3521 // 4. Global autoSlide setting 3522 if( fragmentAutoSlide ) { 3523 autoSlide = parseInt( fragmentAutoSlide, 10 ); 3524 } 3525 else if( slideAutoSlide ) { 3526 autoSlide = parseInt( slideAutoSlide, 10 ); 3527 } 3528 else if( parentAutoSlide ) { 3529 autoSlide = parseInt( parentAutoSlide, 10 ); 3530 } 3531 else { 3532 autoSlide = config.autoSlide;
3533 } 3534 3535 // If there are media elements with data-autoplay, 3536 // automatically set the autoSlide duration to the 3537 // length of that media. Not applicable if the slide 3538 // is divided up into fragments. 3539 if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) { 3540 toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 3541 if( el.hasAttribute( 'data-autoplay' ) ) { 3542 if( autoSlide && el.duration * 1000 > autoSlide ) { 3543 autoSlide = ( el.duration * 1000 ) + 1000; 3544 } 3545 } 3546 } ); 3547 } 3548 3549 // Cue the next auto-slide if: 3550 // - There is an autoSlide value 3551 // - Auto-sliding isn't paused by the user 3552 // - The presentation isn't paused 3553 // - The overview isn't active 3554 // - The presentation isn't over 3555 if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) { 3556 autoSlideTimeout = setTimeout( navigateNext, autoSlide ); 3557 autoSlideStartTime = Date.now(); 3558 } 3559 3560 if( autoSlidePlayer ) { 3561 autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 ); 3562 } 3563 3564 } 3565 3566 } 3567 3568 /** 3569 * Cancels any ongoing request to auto-slide. 3570 */ 3571 function cancelAutoSlide() { 3572 3573 clearTimeout( autoSlideTimeout ); 3574 autoSlideTimeout = -1; 3575 3576 } 3577 3578 function pauseAutoSlide() { 3579 3580 if( autoSlide && !autoSlidePaused ) { 3581 autoSlidePaused = true; 3582 dispatchEvent( 'autoslidepaused' ); 3583 clearTimeout( autoSlideTimeout ); 3584 3585 if( autoSlidePlayer ) { 3586 autoSlidePlayer.setPlaying( false ); 3587 } 3588 } 3589 3590 } 3591 3592 function resumeAutoSlide() { 3593 3594 if( autoSlide && autoSlidePaused ) { 3595 autoSlidePaused = false; 3596 dispatchEvent( 'autoslideresumed' ); 3597 cueAutoSlide(); 3598 } 3599 3600 } 3601 3602 function navigateLeft() { 3603 3604 // Reverse for RTL 3605 if( config.rtl ) { 3606 if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) { 3607 slide( indexh + 1 ); 3608 } 3609 } 3610 // Normal navigation 3611 else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) { 3612 slide( indexh - 1 ); 3613 } 3614 3615 } 3616 3617 function navigateRight() { 3618 3619 // Reverse for RTL 3620 if( config.rtl ) { 3621 if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) { 3622 slide( indexh - 1 ); 3623 } 3624 } 3625 // Normal navigation 3626 else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) { 3627 slide( indexh + 1 ); 3628 } 3629 3630 } 3631 3632 function navigateUp() { 3633 3634 // Prioritize hiding fragments 3635 if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) { 3636 slide( indexh, indexv - 1 ); 3637 } 3638 3639 } 3640 3641 function navigateDown() { 3642 3643 // Prioritize revealing fragments 3644 if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) { 3645 slide( indexh, indexv + 1 ); 3646 } 3647 3648 } 3649 3650 /** 3651 * Navigates backwards, prioritized in the following order: 3652 * 1) Previous fragment 3653 * 2) Previous vertical slide 3654 * 3) Previous horizontal slide 3655 */ 3656 function navigatePrev() { 3657 3658 // Prioritize revealing fragments 3659 if( previousFragment() === false ) { 3660 if( availableRoutes().up ) { 3661 navigateUp(); 3662 } 3663 else { 3664 // Fetch the previous horizontal slide, if there is one 3665 var previousSlide; 3666 3667 if( config.rtl ) { 3668 previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop(); 3669 } 3670 else { 3671 previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop(); 3672 } 3673 3674 if( previousSlide ) { 3675 var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined; 3676 var h = indexh - 1; 3677 slide( h, v ); 3678 } 3679 } 3680 } 3681 3682 } 3683 3684 /** 3685 * The reverse of #navigatePrev(). 3686 */ 3687 function navigateNext() { 3688 3689 // Prioritize revealing fragments 3690 if( nextFragment() === false ) { 3691 if( availableRoutes().down ) { 3692 navigateDown(); 3693 } 3694 else if( config.rtl ) { 3695 navigateLeft(); 3696 } 3697 else { 3698 navigateRight(); 3699 } 3700 } 3701 3702 // If auto-sliding is enabled we need to cue up 3703 // another timeout 3704 cueAutoSlide(); 3705 3706 } 3707 3708 3709 // --------------------------------------------------------------------// 3710 // ----------------------------- EVENTS -------------------------------// 3711 // --------------------------------------------------------------------// 3712 3713 /** 3714 * Called by all event handlers that are based on user 3715 * input. 3716 */ 3717 function onUserInput( event ) { 3718 3719 if( config.autoSlideStoppable ) { 3720 pauseAutoSlide(); 3721 } 3722 3723 } 3724
3725 /** 3726 * Handler for the document level 'keypress' event. 3727 */ 3728 function onDocumentKeyPress( event ) { 3729 3730 // Check if the pressed key is question mark 3731 if( event.shiftKey && event.charCode === 63 ) { 3732 if( dom.overlay ) { 3733 closeOverlay(); 3734 } 3735 else { 3736 showHelp( true ); 3737 } 3738 } 3739 3740 } 3741 3742 /** 3743 * Handler for the document level 'keydown' event. 3744 */ 3745 function onDocumentKeyDown( event ) { 3746 3747 // If there's a condition specified and it returns false, 3748 // ignore this event 3749 if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) { 3750 return true; 3751 } 3752 3753 // Remember if auto-sliding was paused so we can toggle it 3754 var autoSlideWasPaused = autoSlidePaused; 3755 3756 onUserInput( event ); 3757 3758 // Check if there's a focused element that could be using 3759 // the keyboard 3760 var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit'; 3761 var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName ); 3762 3763 // Disregard the event if there's a focused element or a 3764 // keyboard modifier key is present 3765 if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return; 3766 3767 // While paused only allow "unpausing" keyboard events (b and .) 3768 if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) { 3769 return false; 3770 } 3771 3772 var triggered = false; 3773 3774 // 1. User defined key bindings 3775 if( typeof config.keyboard === 'object' ) { 3776 3777 for( var key in config.keyboard ) { 3778 3779 // Check if this binding matches the pressed key 3780 if( parseInt( key, 10 ) === event.keyCode ) { 3781 3782 var value = config.keyboard[ key ]; 3783 3784 // Callback function 3785 if( typeof value === 'function' ) { 3786 value.apply( null, [ event ] ); 3787 } 3788 // String shortcuts to reveal.js API 3789 else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) { 3790 Reveal[ value ].call(); 3791 } 3792 3793 triggered = true; 3794 3795 } 3796 3797 } 3798 3799 } 3800 3801 // 2. System defined key bindings 3802 if( triggered === false ) { 3803 3804 // Assume true and try to prove false 3805 triggered = true; 3806 3807 switch( event.keyCode ) { 3808 // p, page up 3809 case 80: case 33: navigatePrev(); break; 3810 // n, page down 3811 case 78: case 34: navigateNext(); break; 3812 // h, left 3813 case 72: case 37: navigateLeft(); break; 3814 // l, right 3815 case 76: case 39: navigateRight(); break; 3816 // k, up 3817 case 75: case 38: navigateUp(); break; 3818 // j, down 3819 case 74: case 40: navigateDown(); break; 3820 // home 3821 case 36: slide( 0 ); break; 3822 // end 3823 case 35: slide( Number.MAX_VALUE ); break; 3824 // space 3825 case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break; 3826 // return 3827 case 13: isOverview() ? deactivateOverview() : triggered = false; break; 3828 // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button 3829 case 58: case 59: case 66: case 190: case 191: togglePause(); break; 3830 // f 3831 case 70: enterFullscreen(); break; 3832 // a 3833 case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break; 3834 default: 3835 triggered = false; 3836 } 3837 3838 } 3839 3840 // If the input resulted in a triggered action we should prevent 3841 // the browsers default behavior 3842 if( triggered ) { 3843 event.preventDefault && event.preventDefault(); 3844 } 3845 // ESC or O key 3846 else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) { 3847 if( dom.overlay ) { 3848 closeOverlay(); 3849 } 3850 else { 3851 toggleOverview(); 3852 } 3853 3854 event.preventDefault && event.preventDefault(); 3855 } 3856 3857 // If auto-sliding is enabled we need to cue up 3858 // another timeout 3859 cueAutoSlide(); 3860 3861 } 3862 3863 /** 3864 * Handler for the 'touchstart' event, enables support for 3865 * swipe and pinch gestures. 3866 */ 3867 function onTouchStart( event ) { 3868 3869 touch.startX = event.touches[0].clientX; 3870 touch.startY = event.touches[0].clientY; 3871 touch.startCount = event.touches.length; 3872 3873 // If there's two touches we need to memorize the distance 3874 // between those two points to detect pinching 3875 if( event.touches.length === 2 && config.overview ) { 3876 touch.startSpan = distanceBetween( { 3877 x: event.touches[1].clientX, 3878 y: event.touches[1].clientY 3879 }, { 3880 x: touch.startX, 3881 y: touch.startY 3882 } ); 3883 } 3884 3885 } 3886
3887 /** 3888 * Handler for the 'touchmove' event. 3889 */ 3890 function onTouchMove( event ) { 3891 3892 // Each touch should only trigger one action 3893 if( !touch.captured ) { 3894 onUserInput( event ); 3895 3896 var currentX = event.touches[0].clientX; 3897 var currentY = event.touches[0].clientY; 3898 3899 // If the touch started with two points and still has 3900 // two active touches; test for the pinch gesture 3901 if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) { 3902 3903 // The current distance in pixels between the two touch points 3904 var currentSpan = distanceBetween( { 3905 x: event.touches[1].clientX, 3906 y: event.touches[1].clientY 3907 }, { 3908 x: touch.startX, 3909 y: touch.startY 3910 } ); 3911 3912 // If the span is larger than the desire amount we've got 3913 // ourselves a pinch 3914 if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) { 3915 touch.captured = true; 3916 3917 if( currentSpan < touch.startSpan ) { 3918 activateOverview(); 3919 } 3920 else { 3921 deactivateOverview(); 3922 } 3923 } 3924 3925 event.preventDefault(); 3926 3927 } 3928 // There was only one touch point, look for a swipe 3929 else if( event.touches.length === 1 && touch.startCount !== 2 ) { 3930 3931 var deltaX = currentX - touch.startX, 3932 deltaY = currentY - touch.startY; 3933 3934 if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { 3935 touch.captured = true; 3936 navigateLeft(); 3937 } 3938 else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { 3939 touch.captured = true; 3940 navigateRight(); 3941 } 3942 else if( deltaY > touch.threshold ) { 3943 touch.captured = true; 3944 navigateUp(); 3945 } 3946 else if( deltaY < -touch.threshold ) { 3947 touch.captured = true; 3948 navigateDown(); 3949 } 3950 3951 // If we're embedded, only block touch events if they have 3952 // triggered an action 3953 if( config.embedded ) { 3954 if( touch.captured || isVerticalSlide( currentSlide ) ) { 3955 event.preventDefault(); 3956 } 3957 } 3958 // Not embedded? Block them all to avoid needless tossing 3959 // around of the viewport in iOS 3960 else { 3961 event.preventDefault(); 3962 } 3963 3964 } 3965 } 3966 // There's a bug with swiping on some Android devices unless 3967 // the default action is always prevented 3968 else if( navigator.userAgent.match( /android/gi ) ) { 3969 event.preventDefault(); 3970 } 3971 3972 } 3973 3974 /** 3975 * Handler for the 'touchend' event. 3976 */ 3977 function onTouchEnd( event ) { 3978 3979 touch.captured = false; 3980 3981 } 3982 3983 /** 3984 * Convert pointer down to touch start. 3985 */ 3986 function onPointerDown( event ) { 3987 3988 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 3989 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 3990 onTouchStart( event ); 3991 } 3992 3993 } 3994 3995 /** 3996 * Convert pointer move to touch move. 3997 */ 3998 function onPointerMove( event ) { 3999 4000 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 4001 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 4002 onTouchMove( event ); 4003 } 4004 4005 } 4006 4007 /** 4008 * Convert pointer up to touch end. 4009 */ 4010 function onPointerUp( event ) { 4011 4012 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 4013 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 4014 onTouchEnd( event ); 4015 } 4016 4017 } 4018 4019 /** 4020 * Handles mouse wheel scrolling, throttled to avoid skipping 4021 * multiple slides. 4022 */ 4023 function onDocumentMouseScroll( event ) { 4024 4025 if( Date.now() - lastMouseWheelStep > 600 ) { 4026 4027 lastMouseWheelStep = Date.now(); 4028 4029 var delta = event.detail || -event.wheelDelta; 4030 if( delta > 0 ) { 4031 navigateNext(); 4032 } 4033 else { 4034 navigatePrev(); 4035 } 4036 4037 } 4038 4039 } 4040 4041 /** 4042 * Clicking on the progress bar results in a navigation to the 4043 * closest approximate horizontal slide using this equation: 4044 * 4045 * ( clickX / presentationWidth ) * numberOfSlides 4046 */ 4047 function onProgressClicked( event ) { 4048 4049 onUserInput( event ); 4050 4051 event.preventDefault(); 4052 4053 var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length; 4054 var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal ); 4055 4056 if( config.rtl ) { 4057 slideIndex = slidesTotal - slideIndex; 4058 } 4059 4060 slide( slideIndex ); 4061 4062 } 4063
4064 /** 4065 * Event handler for navigation control buttons. 4066 */ 4067 function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); } 4068 function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); } 4069 function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); } 4070 function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); } 4071 function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); } 4072 function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); } 4073 4074 /** 4075 * Handler for the window level 'hashchange' event. 4076 */ 4077 function onWindowHashChange( event ) { 4078 4079 readURL(); 4080 4081 } 4082 4083 /** 4084 * Handler for the window level 'resize' event. 4085 */ 4086 function onWindowResize( event ) { 4087 4088 layout(); 4089 4090 } 4091 4092 /** 4093 * Handle for the window level 'visibilitychange' event. 4094 */ 4095 function onPageVisibilityChange( event ) { 4096 4097 var isHidden = document.webkitHidden || 4098 document.msHidden || 4099 document.hidden; 4100 4101 // If, after clicking a link or similar and we're coming back, 4102 // focus the document.body to ensure we can use keyboard shortcuts 4103 if( isHidden === false && document.activeElement !== document.body ) { 4104 // Not all elements support .blur() - SVGs among them. 4105 if( typeof document.activeElement.blur === 'function' ) { 4106 document.activeElement.blur(); 4107 } 4108 document.body.focus(); 4109 } 4110 4111 } 4112 4113 /** 4114 * Invoked when a slide is and we're in the overview. 4115 */ 4116 function onOverviewSlideClicked( event ) { 4117 4118 // TODO There's a bug here where the event listeners are not 4119 // removed after deactivating the overview. 4120 if( eventsAreBound && isOverview() ) { 4121 event.preventDefault(); 4122 4123 var element = event.target; 4124 4125 while( element && !element.nodeName.match( /section/gi ) ) { 4126 element = element.parentNode; 4127 } 4128 4129 if( element && !element.classList.contains( 'disabled' ) ) { 4130 4131 deactivateOverview(); 4132 4133 if( element.nodeName.match( /section/gi ) ) { 4134 var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ), 4135 v = parseInt( element.getAttribute( 'data-index-v' ), 10 ); 4136 4137 slide( h, v ); 4138 } 4139 4140 } 4141 } 4142 4143 } 4144 4145 /** 4146 * Handles clicks on links that are set to preview in the 4147 * iframe overlay. 4148 */ 4149 function onPreviewLinkClicked( event ) { 4150 4151 if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) { 4152 var url = event.currentTarget.getAttribute( 'href' ); 4153 if( url ) { 4154 showPreview( url ); 4155 event.preventDefault(); 4156 } 4157 } 4158 4159 } 4160 4161 /** 4162 * Handles click on the auto-sliding controls element. 4163 */ 4164 function onAutoSlidePlayerClick( event ) { 4165 4166 // Replay 4167 if( Reveal.isLastSlide() && config.loop === false ) { 4168 slide( 0, 0 ); 4169 resumeAutoSlide(); 4170 } 4171 // Resume 4172 else if( autoSlidePaused ) { 4173 resumeAutoSlide(); 4174 } 4175 // Pause 4176 else { 4177 pauseAutoSlide(); 4178 } 4179 4180 } 4181 4182 4183 // --------------------------------------------------------------------// 4184 // ------------------------ PLAYBACK COMPONENT ------------------------// 4185 // --------------------------------------------------------------------// 4186 4187 4188 /** 4189 * Constructor for the playback component, which displays 4190 * play/pause/progress controls. 4191 * 4192 * @param {HTMLElement} container The component will append 4193 * itself to this 4194 * @param {Function} progressCheck A method which will be 4195 * called frequently to get the current progress on a range 4196 * of 0-1 4197 */ 4198 function Playback( container, progressCheck ) { 4199 4200 // Cosmetics 4201 this.diameter = 50; 4202 this.thickness = 3; 4203 4204 // Flags if we are currently playing 4205 this.playing = false; 4206 4207 // Current progress on a 0-1 range 4208 this.progress = 0; 4209 4210 // Used to loop the animation smoothly 4211 this.progressOffset = 1; 4212 4213 this.container = container; 4214 this.progressCheck = progressCheck; 4215 4216 this.canvas = document.createElement( 'canvas' ); 4217 this.canvas.className = 'playback'; 4218 this.canvas.width = this.diameter; 4219 this.canvas.height = this.diameter; 4220 this.context = this.canvas.getContext( '2d' ); 4221 4222 this.container.appendChild( this.canvas ); 4223 4224 this.render(); 4225 4226 } 4227 4228 Playback.prototype.setPlaying = function( value ) { 4229 4230 var wasPlaying = this.playing; 4231 4232 this.playing = value; 4233 4234 // Start repainting if we weren't already 4235 if( !wasPlaying && this.playing ) { 4236 this.animate(); 4237 } 4238 else { 4239 this.render(); 4240 } 4241 4242 }; 4243 4244 Playback.prototype.animate = function() { 4245 4246 var progressBefore = this.progress; 4247 4248 this.progress = this.progressCheck(); 4249 4250 // When we loop, offset the progress so that it eases
4251 // smoothly rather than immediately resetting 4252 if( progressBefore > 0.8 && this.progress < 0.2 ) { 4253 this.progressOffset = this.progress; 4254 } 4255 4256 this.render(); 4257 4258 if( this.playing ) { 4259 features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) ); 4260 } 4261 4262 }; 4263 4264 /** 4265 * Renders the current progress and playback state. 4266 */ 4267 Playback.prototype.render = function() { 4268 4269 var progress = this.playing ? this.progress : 0, 4270 radius = ( this.diameter / 2 ) - this.thickness, 4271 x = this.diameter / 2, 4272 y = this.diameter / 2, 4273 iconSize = 14; 4274 4275 // Ease towards 1 4276 this.progressOffset += ( 1 - this.progressOffset ) * 0.1; 4277 4278 var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) ); 4279 var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) ); 4280 4281 this.context.save(); 4282 this.context.clearRect( 0, 0, this.diameter, this.diameter ); 4283 4284 // Solid background color 4285 this.context.beginPath(); 4286 this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false ); 4287 this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )'; 4288 this.context.fill(); 4289 4290 // Draw progress track 4291 this.context.beginPath(); 4292 this.context.arc( x, y, radius, 0, Math.PI * 2, false ); 4293 this.context.lineWidth = this.thickness; 4294 this.context.strokeStyle = '#666'; 4295 this.context.stroke(); 4296 4297 if( this.playing ) { 4298 // Draw progress on top of track 4299 this.context.beginPath(); 4300 this.context.arc( x, y, radius, startAngle, endAngle, false ); 4301 this.context.lineWidth = this.thickness; 4302 this.context.strokeStyle = '#fff'; 4303 this.context.stroke(); 4304 } 4305 4306 this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) ); 4307 4308 // Draw play/pause icons 4309 if( this.playing ) { 4310 this.context.fillStyle = '#fff'; 4311 this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize ); 4312 this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize ); 4313 } 4314 else { 4315 this.context.beginPath(); 4316 this.context.translate( 2, 0 ); 4317 this.context.moveTo( 0, 0 ); 4318 this.context.lineTo( iconSize - 2, iconSize / 2 ); 4319 this.context.lineTo( 0, iconSize ); 4320 this.context.fillStyle = '#fff'; 4321 this.context.fill(); 4322 } 4323 4324 this.context.restore(); 4325 4326 }; 4327 4328 Playback.prototype.on = function( type, listener ) { 4329 this.canvas.addEventListener( type, listener, false ); 4330 }; 4331 4332 Playback.prototype.off = function( type, listener ) { 4333 this.canvas.removeEventListener( type, listener, false ); 4334 }; 4335 4336 Playback.prototype.destroy = function() { 4337 4338 this.playing = false; 4339 4340 if( this.canvas.parentNode ) { 4341 this.container.removeChild( this.canvas ); 4342 } 4343 4344 }; 4345 4346 4347 // --------------------------------------------------------------------// 4348 // ------------------------------- API --------------------------------// 4349 // --------------------------------------------------------------------// 4350 4351 4352 Reveal = { 4353 initialize: initialize, 4354 configure: configure, 4355 sync: sync, 4356 4357 // Navigation methods 4358 slide: slide, 4359 left: navigateLeft, 4360 right: navigateRight, 4361 up: navigateUp, 4362 down: navigateDown, 4363 prev: navigatePrev, 4364 next: navigateNext, 4365 4366 // Fragment methods 4367 navigateFragment: navigateFragment, 4368 prevFragment: previousFragment, 4369 nextFragment: nextFragment, 4370 4371 // Deprecated aliases 4372 navigateTo: slide, 4373 navigateLeft: navigateLeft, 4374 navigateRight: navigateRight, 4375 navigateUp: navigateUp, 4376 navigateDown: navigateDown, 4377 navigatePrev: navigatePrev, 4378 navigateNext: navigateNext, 4379 4380 // Forces an update in slide layout 4381 layout: layout, 4382 4383 // Returns an object with the available routes as booleans (left/right/top/bottom) 4384 availableRoutes: availableRoutes, 4385 4386 // Returns an object with the available fragments as booleans (prev/next) 4387 availableFragments: availableFragments, 4388 4389 // Toggles the overview mode on/off 4390 toggleOverview: toggleOverview, 4391 4392 // Toggles the "black screen" mode on/off 4393 togglePause: togglePause, 4394 4395 // Toggles the auto slide mode on/off 4396 toggleAutoSlide: toggleAutoSlide, 4397 4398 // State checks 4399 isOverview: isOverview, 4400 isPaused: isPaused, 4401 isAutoSliding: isAutoSliding, 4402 4403 // Adds or removes all internal event listeners (such as keyboard) 4404 addEventListeners: addEventListeners, 4405 removeEventListeners: removeEventListeners, 4406 4407 // Facility for persisting and restoring the presentation state 4408 getState: getState, 4409 setState: setState, 4410 4411 // Presentation progress on range of 0-1 4412 getProgress: getProgress, 4413 4414 // Returns the indices of the current, or specified, slide 4415 getIndices: getIndices, 4416 4417 getTotalSlides: getTotalSlides, 4418 4419 // Returns the slide element at the specified index 4420 getSlide: getSlide, 4421 4422 // Returns the slide background element at the specified index
4423 getSlideBackground: getSlideBackground, 4424 4425 // Returns the previous slide element, may be null 4426 getPreviousSlide: function() { 4427 return previousSlide; 4428 }, 4429 4430 // Returns the current slide element 4431 getCurrentSlide: function() { 4432 return currentSlide; 4433 }, 4434 4435 // Returns the current scale of the presentation content 4436 getScale: function() { 4437 return scale; 4438 }, 4439 4440 // Returns the current configuration object 4441 getConfig: function() { 4442 return config; 4443 }, 4444 4445 // Helper method, retrieves query string as a key/value hash 4446 getQueryHash: function() { 4447 var query = {}; 4448 4449 location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) { 4450 query[ a.split( '=' ).shift() ] = a.split( '=' ).pop(); 4451 } ); 4452 4453 // Basic deserialization 4454 for( var i in query ) { 4455 var value = query[ i ]; 4456 4457 query[ i ] = deserialize( unescape( value ) ); 4458 } 4459 4460 return query; 4461 }, 4462 4463 // Returns true if we're currently on the first slide 4464 isFirstSlide: function() { 4465 return ( indexh === 0 && indexv === 0 ); 4466 }, 4467 4468 // Returns true if we're currently on the last slide 4469 isLastSlide: function() { 4470 if( currentSlide ) { 4471 // Does this slide has next a sibling? 4472 if( currentSlide.nextElementSibling ) return false; 4473 4474 // If it's vertical, does its parent have a next sibling? 4475 if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false; 4476 4477 return true; 4478 } 4479 4480 return false; 4481 }, 4482 4483 // Checks if reveal.js has been loaded and is ready for use 4484 isReady: function() { 4485 return loaded; 4486 }, 4487 4488 // Forward event binding to the reveal DOM element 4489 addEventListener: function( type, listener, useCapture ) { 4490 if( 'addEventListener' in window ) { 4491 ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture ); 4492 } 4493 }, 4494 removeEventListener: function( type, listener, useCapture ) { 4495 if( 'addEventListener' in window ) { 4496 ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture ); 4497 } 4498 }, 4499 4500 // Programatically triggers a keyboard event 4501 triggerKey: function( keyCode ) { 4502 onDocumentKeyDown( { keyCode: keyCode } ); 4503 } 4504 }; 4505 4506 return Reveal; 4507 4508}));
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.