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 // Configurations 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 // Number of slides away from the current that are visible 140 viewDistance: 3, 141 142 // Script dependencies to load 143 dependencies: [] 144 145 }, 146 147 // Flags if reveal.js is loaded (has dispatched the 'ready' event) 148 loaded = false, 149 150 // The horizontal and vertical index of the currently active slide 151 indexh, 152 indexv, 153 154 // The previous and current slide HTML elements 155 previousSlide, 156 currentSlide, 157 158 previousBackground, 159 160 // Slides may hold a data-state attribute which we pick up and apply 161 // as a class to the body. This list contains the combined state of 162 // all current slides. 163 state = [], 164 165 // The current scale of the presentation (see width/height config) 166 scale = 1, 167 168 // Cached references to DOM elements 169 dom = {}, 170 171 // Features supported by the browser, see #checkCapabilities() 172 features = {}, 173 174 // Client is a mobile device, see #checkCapabilities() 175 isMobileDevice, 176 177 // Throttles mouse wheel navigation 178 lastMouseWheelStep = 0, 179 180 // Delays updates to the URL due to a Chrome thumbnailer bug 181 writeURLTimeout = 0, 182 183 // Flags if the interaction event listeners are bound 184 eventsAreBound = false, 185 186 // The current auto-slide duration 187 autoSlide = 0, 188 189 // Auto slide properties 190 autoSlidePlayer, 191 autoSlideTimeout = 0, 192 autoSlideStartTime = -1, 193 autoSlidePaused = false, 194 195 // Holds information about the currently ongoing touch input 196 touch = { 197 startX: 0, 198 startY: 0, 199 startSpan: 0, 200 startCount: 0, 201 captured: false, 202 threshold: 40 203 }, 204 205 // Holds information about the keyboard shortcuts 206 keyboardShortcuts = { 207 'N , SPACE': 'Next slide', 208 'P': 'Previous slide', 209 '← , H': 'Navigate left', 210 '→ , L': 'Navigate right', 211 '↑ , K': 'Navigate up', 212 '↓ , J': 'Navigate down', 213 'Home': 'First slide', 214 'End': 'Last slide', 215 'B , .': 'Pause', 216 'F': 'Fullscreen', 217 'ESC, O': 'Slide overview' 218 }; 219 220 /** 221 * Starts up the presentation if the client is capable. 222 */ 223 function initialize( options ) { 224 225 checkCapabilities(); 226 227 if( !features.transforms2d && !features.transforms3d ) { 228 document.body.setAttribute( 'class', 'no-transforms' ); 229 230 // Since JS won't be running any further, we need to load all 231 // images that were intended to lazy load now 232 var images = document.getElementsByTagName( 'img' ); 233 for( var i = 0, len = images.length; i < len; i++ ) { 234 var image = images[i]; 235 if( image.getAttribute( 'data-src' ) ) { 236 image.setAttribute( 'src', image.getAttribute( 'data-src' ) ); 237 image.removeAttribute( 'data-src' ); 238 } 239 } 240 241 // If the browser doesn't support core features we won't be 242 // using JavaScript to control the presentation 243 return; 244 } 245 246 // Cache references to key DOM elements 247 dom.wrapper = document.querySelector( '.reveal' ); 248 dom.slides = document.querySelector( '.reveal .slides' ); 249 250 // Force a layout when the whole page, incl fonts, has loaded 251 window.addEventListener( 'load', layout, false ); 252 253 var query = Reveal.getQueryHash(); 254
255 // Do not accept new dependencies via query config to avoid 256 // the potential of malicious script injection 257 if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies']; 258 259 // Copy options over to our config object 260 extend( config, options ); 261 extend( config, query ); 262 263 // Hide the address bar in mobile browsers 264 hideAddressBar(); 265 266 // Loads the dependencies and continues to #start() once done 267 load(); 268 269 } 270 271 /** 272 * Inspect the client to see what it's capable of, this 273 * should only happens once per runtime. 274 */ 275 function checkCapabilities() { 276 277 features.transforms3d = 'WebkitPerspective' in document.body.style || 278 'MozPerspective' in document.body.style || 279 'msPerspective' in document.body.style || 280 'OPerspective' in document.body.style || 281 'perspective' in document.body.style; 282 283 features.transforms2d = 'WebkitTransform' in document.body.style || 284 'MozTransform' in document.body.style || 285 'msTransform' in document.body.style || 286 'OTransform' in document.body.style || 287 'transform' in document.body.style; 288 289 features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame; 290 features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function'; 291 292 features.canvas = !!document.createElement( 'canvas' ).getContext; 293 294 features.touch = !!( 'ontouchstart' in window ); 295 296 isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ); 297 298 } 299 300 /** 301 * Loads the dependencies of reveal.js. Dependencies are 302 * defined via the configuration option 'dependencies' 303 * and will be loaded prior to starting/binding reveal.js. 304 * Some dependencies may have an 'async' flag, if so they 305 * will load after reveal.js has been started up. 306 */ 307 function load() { 308 309 var scripts = [], 310 scriptsAsync = [], 311 scriptsToPreload = 0; 312 313 // Called once synchronous scripts finish loading 314 function proceed() { 315 if( scriptsAsync.length ) { 316 // Load asynchronous scripts 317 head.js.apply( null, scriptsAsync ); 318 } 319 320 start(); 321 } 322 323 function loadScript( s ) { 324 head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() { 325 // Extension may contain callback functions 326 if( typeof s.callback === 'function' ) { 327 s.callback.apply( this ); 328 } 329 330 if( --scriptsToPreload === 0 ) { 331 proceed(); 332 } 333 }); 334 } 335 336 for( var i = 0, len = config.dependencies.length; i < len; i++ ) { 337 var s = config.dependencies[i]; 338 339 // Load if there's no condition or the condition is truthy 340 if( !s.condition || s.condition() ) { 341 if( s.async ) { 342 scriptsAsync.push( s.src ); 343 } 344 else { 345 scripts.push( s.src ); 346 } 347 348 loadScript( s ); 349 } 350 } 351 352 if( scripts.length ) { 353 scriptsToPreload = scripts.length; 354 355 // Load synchronous scripts 356 head.js.apply( null, scripts ); 357 } 358 else { 359 proceed(); 360 } 361 362 } 363 364 /** 365 * Starts up reveal.js by binding input events and navigating 366 * to the current URL deeplink if there is one. 367 */ 368 function start() { 369 370 // Make sure we've got all the DOM elements we need 371 setupDOM(); 372 373 // Listen to messages posted to this window 374 setupPostMessage(); 375 376 // Resets all vertical slides so that only the first is visible 377 resetVerticalSlides(); 378 379 // Updates the presentation to match the current configuration values 380 configure(); 381 382 // Read the initial hash 383 readURL(); 384 385 // Update all backgrounds
386 updateBackground( true ); 387 388 // Notify listeners that the presentation is ready but use a 1ms 389 // timeout to ensure it's not fired synchronously after #initialize() 390 setTimeout( function() { 391 // Enable transitions now that we're loaded 392 dom.slides.classList.remove( 'no-transition' ); 393 394 loaded = true; 395 396 dispatchEvent( 'ready', { 397 'indexh': indexh, 398 'indexv': indexv, 399 'currentSlide': currentSlide 400 } ); 401 }, 1 ); 402 403 // Special setup and config is required when printing to PDF 404 if( isPrintingPDF() ) { 405 removeEventListeners(); 406 407 // The document needs to have loaded for the PDF layout 408 // measurements to be accurate 409 if( document.readyState === 'complete' ) { 410 setupPDF(); 411 } 412 else { 413 window.addEventListener( 'load', setupPDF ); 414 } 415 } 416 417 } 418 419 /** 420 * Finds and stores references to DOM elements which are 421 * required by the presentation. If a required element is 422 * not found, it is created. 423 */ 424 function setupDOM() { 425 426 // Prevent transitions while we're loading 427 dom.slides.classList.add( 'no-transition' ); 428 429 // Background element 430 dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null ); 431 432 // Progress bar 433 dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' ); 434 dom.progressbar = dom.progress.querySelector( 'span' ); 435 436 // Arrow controls 437 createSingletonNode( dom.wrapper, 'aside', 'controls', 438 '<div class="navigate-left"></div>' + 439 '<div class="navigate-right"></div>' + 440 '<div class="navigate-up"></div>' + 441 '<div class="navigate-down"></div>' ); 442 443 // Slide number 444 dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' ); 445 446 // Overlay graphic which is displayed during the paused mode 447 createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null ); 448 449 // Cache references to elements 450 dom.controls = document.querySelector( '.reveal .controls' ); 451 dom.theme = document.querySelector( '#theme' ); 452 453 dom.wrapper.setAttribute( 'role', 'application' ); 454 455 // There can be multiple instances of controls throughout the page 456 dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) ); 457 dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) ); 458 dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) ); 459 dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) ); 460 dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) ); 461 dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) ); 462 463 dom.statusDiv = createStatusDiv(); 464 } 465 466 /** 467 * Creates a hidden div with role aria-live to announce the 468 * current slide content. Hide the div off-screen to make it 469 * available only to Assistive Technologies. 470 */ 471 function createStatusDiv() { 472 473 var statusDiv = document.getElementById( 'aria-status-div' ); 474 if( !statusDiv ) { 475 statusDiv = document.createElement( 'div' ); 476 statusDiv.style.position = 'absolute'; 477 statusDiv.style.height = '1px'; 478 statusDiv.style.width = '1px'; 479 statusDiv.style.overflow ='hidden'; 480 statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )'; 481 statusDiv.setAttribute( 'id', 'aria-status-div' ); 482 statusDiv.setAttribute( 'aria-live', 'polite' ); 483 statusDiv.setAttribute( 'aria-atomic','true' ); 484 dom.wrapper.appendChild( statusDiv ); 485 } 486 return statusDiv; 487 488 } 489 490 /** 491 * Configures the presentation for printing to a static 492 * PDF. 493 */ 494 function setupPDF() { 495 496 var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight ); 497 498 // Dimensions of the PDF pages 499 var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ), 500 pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) ); 501 502 // Dimensions of slides within the pages 503 var slideWidth = slideSize.width, 504 slideHeight = slideSize.height; 505 506 // Let the browser know what page size we want to print 507 injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' ); 508 509 // Limit the size of certain elements to the dimensions of the slide 510 injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' ); 511 512 document.body.classList.add( 'print-pdf' ); 513 document.body.style.width = pageWidth + 'px'; 514 document.body.style.height = pageHeight + 'px'; 515 516 // Slide and slide background layout 517 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { 518 519 // Vertical stacks are not centred since their section 520 // children will be 521 if( slide.classList.contains( 'stack' ) === false ) { 522 // Center the slide inside of the page, giving the slide some margin 523 var left = ( pageWidth - slideWidth ) / 2, 524 top = ( pageHeight - slideHeight ) / 2; 525 526 var contentHeight = getAbsoluteHeight( slide ); 527 var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 ); 528 529 // Center slides vertically 530 if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) { 531 top = Math.max( ( pageHeight - contentHeight ) / 2, 0 ); 532 } 533 534 // Position the slide inside of the page 535 slide.style.left = left + 'px'; 536 slide.style.top = top + 'px'; 537 slide.style.width = slideWidth + 'px'; 538
539 // TODO Backgrounds need to be multiplied when the slide 540 // stretches over multiple pages 541 var background = slide.querySelector( '.slide-background' ); 542 if( background ) { 543 background.style.width = pageWidth + 'px'; 544 background.style.height = ( pageHeight * numberOfPages ) + 'px'; 545 background.style.top = -top + 'px'; 546 background.style.left = -left + 'px'; 547 } 548 } 549 550 } ); 551 552 // Show all fragments 553 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) { 554 fragment.classList.add( 'visible' ); 555 } ); 556 557 } 558 559 /** 560 * Creates an HTML element and returns a reference to it. 561 * If the element already exists the existing instance will 562 * be returned. 563 */ 564 function createSingletonNode( container, tagname, classname, innerHTML ) { 565 566 // Find all nodes matching the description 567 var nodes = container.querySelectorAll( '.' + classname ); 568 569 // Check all matches to find one which is a direct child of 570 // the specified container 571 for( var i = 0; i < nodes.length; i++ ) { 572 var testNode = nodes[i]; 573 if( testNode.parentNode === container ) { 574 return testNode; 575 } 576 } 577 578 // If no node was found, create it now 579 var node = document.createElement( tagname ); 580 node.classList.add( classname ); 581 if( typeof innerHTML === 'string' ) { 582 node.innerHTML = innerHTML; 583 } 584 container.appendChild( node ); 585 586 return node; 587 588 } 589 590 /** 591 * Creates the slide background elements and appends them 592 * to the background container. One element is created per 593 * slide no matter if the given slide has visible background. 594 */ 595 function createBackgrounds() { 596 597 var printMode = isPrintingPDF(); 598 599 // Clear prior backgrounds 600 dom.background.innerHTML = ''; 601 dom.background.classList.add( 'no-transition' ); 602 603 // Iterate over all horizontal slides 604 toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) { 605 606 var backgroundStack; 607 608 if( printMode ) { 609 backgroundStack = createBackground( slideh, slideh ); 610 } 611 else { 612 backgroundStack = createBackground( slideh, dom.background ); 613 } 614 615 // Iterate over all vertical slides 616 toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) { 617 618 if( printMode ) { 619 createBackground( slidev, slidev ); 620 } 621 else { 622 createBackground( slidev, backgroundStack ); 623 } 624 625 backgroundStack.classList.add( 'stack' ); 626 627 } ); 628 629 } ); 630 631 // Add parallax background if specified 632 if( config.parallaxBackgroundImage ) { 633 634 dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")'; 635 dom.background.style.backgroundSize = config.parallaxBackgroundSize; 636 637 // Make sure the below properties are set on the element - these properties are 638 // needed for proper transitions to be set on the element via CSS. To remove 639 // annoying background slide-in effect when the presentation starts, apply 640 // these properties after short time delay 641 setTimeout( function() { 642 dom.wrapper.classList.add( 'has-parallax-background' ); 643 }, 1 ); 644 645 } 646 else { 647 648 dom.background.style.backgroundImage = ''; 649 dom.wrapper.classList.remove( 'has-parallax-background' ); 650 651 } 652 653 } 654 655 /** 656 * Creates a background for the given slide. 657 * 658 * @param {HTMLElement} slide 659 * @param {HTMLElement} container The element that the background 660 * should be appended to 661 */ 662 function createBackground( slide, container ) { 663 664 var data = { 665 background: slide.getAttribute( 'data-background' ),
666 backgroundSize: slide.getAttribute( 'data-background-size' ), 667 backgroundImage: slide.getAttribute( 'data-background-image' ), 668 backgroundVideo: slide.getAttribute( 'data-background-video' ), 669 backgroundIframe: slide.getAttribute( 'data-background-iframe' ), 670 backgroundColor: slide.getAttribute( 'data-background-color' ), 671 backgroundRepeat: slide.getAttribute( 'data-background-repeat' ), 672 backgroundPosition: slide.getAttribute( 'data-background-position' ), 673 backgroundTransition: slide.getAttribute( 'data-background-transition' ) 674 }; 675 676 var element = document.createElement( 'div' ); 677 678 // Carry over custom classes from the slide to the background 679 element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' ); 680 681 if( data.background ) { 682 // Auto-wrap image urls in url(...) 683 if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) { 684 slide.setAttribute( 'data-background-image', data.background ); 685 } 686 else { 687 element.style.background = data.background; 688 } 689 } 690 691 // Create a hash for this combination of background settings. 692 // This is used to determine when two slide backgrounds are 693 // the same. 694 if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) { 695 element.setAttribute( 'data-background-hash', data.background + 696 data.backgroundSize + 697 data.backgroundImage + 698 data.backgroundVideo + 699 data.backgroundIframe + 700 data.backgroundColor + 701 data.backgroundRepeat + 702 data.backgroundPosition + 703 data.backgroundTransition ); 704 } 705 706 // Additional and optional background properties 707 if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize; 708 if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor; 709 if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat; 710 if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition; 711 if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition ); 712 713 container.appendChild( element ); 714 715 // If backgrounds are being recreated, clear old classes 716 slide.classList.remove( 'has-dark-background' ); 717 slide.classList.remove( 'has-light-background' ); 718 719 // If this slide has a background color, add a class that 720 // signals if it is light or dark. If the slide has no background 721 // color, no class will be set 722 var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor; 723 if( computedBackgroundColor ) { 724 var rgb = colorToRgb( computedBackgroundColor ); 725 726 // Ignore fully transparent backgrounds. Some browsers return 727 // rgba(0,0,0,0) when reading the computed background color of 728 // an element with no background 729 if( rgb && rgb.a !== 0 ) { 730 if( colorBrightness( computedBackgroundColor ) < 128 ) { 731 slide.classList.add( 'has-dark-background' ); 732 } 733 else { 734 slide.classList.add( 'has-light-background' ); 735 } 736 } 737 } 738 739 return element; 740 741 } 742
743 /** 744 * Registers a listener to postMessage events, this makes it 745 * possible to call all reveal.js API methods from another 746 * window. For example: 747 * 748 * revealWindow.postMessage( JSON.stringify({ 749 * method: 'slide', 750 * args: [ 2 ] 751 * }), '*' ); 752 */ 753 function setupPostMessage() { 754 755 if( config.postMessage ) { 756 window.addEventListener( 'message', function ( event ) { 757 var data = event.data; 758 759 // Make sure we're dealing with JSON 760 if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) { 761 data = JSON.parse( data ); 762 763 // Check if the requested method can be found 764 if( data.method && typeof Reveal[data.method] === 'function' ) { 765 Reveal[data.method].apply( Reveal, data.args ); 766 } 767 } 768 }, false ); 769 } 770 771 } 772 773 /** 774 * Applies the configuration settings from the config 775 * object. May be called multiple times. 776 */ 777 function configure( options ) { 778 779 var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length; 780 781 dom.wrapper.classList.remove( config.transition ); 782 783 // New config options may be passed when this method 784 // is invoked through the API after initialization 785 if( typeof options === 'object' ) extend( config, options ); 786 787 // Force linear transition based on browser capabilities 788 if( features.transforms3d === false ) config.transition = 'linear'; 789 790 dom.wrapper.classList.add( config.transition ); 791 792 dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed ); 793 dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition ); 794 795 dom.controls.style.display = config.controls ? 'block' : 'none'; 796 dom.progress.style.display = config.progress ? 'block' : 'none'; 797 798 if( config.rtl ) { 799 dom.wrapper.classList.add( 'rtl' ); 800 } 801 else { 802 dom.wrapper.classList.remove( 'rtl' ); 803 } 804 805 if( config.center ) { 806 dom.wrapper.classList.add( 'center' ); 807 } 808 else { 809 dom.wrapper.classList.remove( 'center' ); 810 } 811 812 // Exit the paused mode if it was configured off 813 if( config.pause === false ) { 814 resume(); 815 } 816 817 if( config.mouseWheel ) { 818 document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF 819 document.addEventListener( 'mousewheel', onDocumentMouseScroll, false ); 820 } 821 else { 822 document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF 823 document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false ); 824 } 825 826 // Rolling 3D links 827 if( config.rollingLinks ) { 828 enableRollingLinks(); 829 } 830 else { 831 disableRollingLinks(); 832 } 833 834 // Iframe link previews 835 if( config.previewLinks ) { 836 enablePreviewLinks(); 837 } 838 else { 839 disablePreviewLinks(); 840 enablePreviewLinks( '[data-preview-link]' ); 841 } 842 843 // Remove existing auto-slide controls 844 if( autoSlidePlayer ) { 845 autoSlidePlayer.destroy(); 846 autoSlidePlayer = null; 847 } 848 849 // Generate auto-slide controls if needed 850 if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) { 851 autoSlidePlayer = new Playback( dom.wrapper, function() { 852 return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 ); 853 } ); 854 855 autoSlidePlayer.on( 'click', onAutoSlidePlayerClick ); 856 autoSlidePaused = false; 857 } 858 859 // When fragments are turned off they should be visible 860 if( config.fragments === false ) { 861 toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) { 862 element.classList.add( 'visible' ); 863 element.classList.remove( 'current-fragment' ); 864 } ); 865 } 866 867 sync(); 868 869 } 870 871 /** 872 * Binds all event listeners. 873 */ 874 function addEventListeners() { 875 876 eventsAreBound = true; 877 878 window.addEventListener( 'hashchange', onWindowHashChange, false ); 879 window.addEventListener( 'resize', onWindowResize, false ); 880 881 if( config.touch ) { 882 dom.wrapper.addEventListener( 'touchstart', onTouchStart, false ); 883 dom.wrapper.addEventListener( 'touchmove', onTouchMove, false ); 884 dom.wrapper.addEventListener( 'touchend', onTouchEnd, false ); 885 886 // Support pointer-style touch interaction as well 887 if( window.navigator.pointerEnabled ) { 888 // IE 11 uses un-prefixed version of pointer events 889 dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false ); 890 dom.wrapper.addEventListener( 'pointermove', onPointerMove, false ); 891 dom.wrapper.addEventListener( 'pointerup', onPointerUp, false ); 892 } 893 else if( window.navigator.msPointerEnabled ) { 894 // IE 10 uses prefixed version of pointer events 895 dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false ); 896 dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false ); 897 dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false ); 898 } 899 } 900 901 if( config.keyboard ) { 902 document.addEventListener( 'keydown', onDocumentKeyDown, false ); 903 document.addEventListener( 'keypress', onDocumentKeyPress, false ); 904 } 905 906 if( config.progress && dom.progress ) { 907 dom.progress.addEventListener( 'click', onProgressClicked, false ); 908 } 909 910 if( config.focusBodyOnPageVisibilityChange ) { 911 var visibilityChange; 912 913 if( 'hidden' in document ) { 914 visibilityChange = 'visibilitychange'; 915 } 916 else if( 'msHidden' in document ) { 917 visibilityChange = 'msvisibilitychange'; 918 } 919 else if( 'webkitHidden' in document ) { 920 visibilityChange = 'webkitvisibilitychange'; 921 } 922 923 if( visibilityChange ) { 924 document.addEventListener( visibilityChange, onPageVisibilityChange, false ); 925 } 926 } 927 928 // Listen to both touch and click events, in case the device 929 // supports both 930 var pointerEvents = [ 'touchstart', 'click' ]; 931 932 // Only support touch for Android, fixes double navigations in 933 // stock browser 934 if( navigator.userAgent.match( /android/gi ) ) { 935 pointerEvents = [ 'touchstart' ]; 936 } 937
938 pointerEvents.forEach( function( eventName ) { 939 dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } ); 940 dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } ); 941 dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } ); 942 dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } ); 943 dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } ); 944 dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } ); 945 } ); 946 947 } 948 949 /** 950 * Unbinds all event listeners. 951 */ 952 function removeEventListeners() { 953 954 eventsAreBound = false; 955 956 document.removeEventListener( 'keydown', onDocumentKeyDown, false ); 957 document.removeEventListener( 'keypress', onDocumentKeyPress, false ); 958 window.removeEventListener( 'hashchange', onWindowHashChange, false ); 959 window.removeEventListener( 'resize', onWindowResize, false ); 960 961 dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false ); 962 dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false ); 963 dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false ); 964 965 // IE11 966 if( window.navigator.pointerEnabled ) { 967 dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false ); 968 dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false ); 969 dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false ); 970 } 971 // IE10 972 else if( window.navigator.msPointerEnabled ) { 973 dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false ); 974 dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false ); 975 dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false ); 976 } 977 978 if ( config.progress && dom.progress ) { 979 dom.progress.removeEventListener( 'click', onProgressClicked, false ); 980 } 981 982 [ 'touchstart', 'click' ].forEach( function( eventName ) { 983 dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } ); 984 dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } ); 985 dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } ); 986 dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } ); 987 dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } ); 988 dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } ); 989 } ); 990 991 } 992 993 /** 994 * Extend object a with the properties of object b. 995 * If there's a conflict, object b takes precedence. 996 */ 997 function extend( a, b ) { 998 999 for( var i in b ) { 1000 a[ i ] = b[ i ]; 1001 } 1002 1003 } 1004 1005 /** 1006 * Converts the target object to an array. 1007 */ 1008 function toArray( o ) { 1009 1010 return Array.prototype.slice.call( o ); 1011 1012 } 1013 1014 /** 1015 * Utility for deserializing a value. 1016 */ 1017 function deserialize( value ) { 1018 1019 if( typeof value === 'string' ) { 1020 if( value === 'null' ) return null; 1021 else if( value === 'true' ) return true; 1022 else if( value === 'false' ) return false; 1023 else if( value.match( /^\d+$/ ) ) return parseFloat( value ); 1024 } 1025 1026 return value; 1027 1028 } 1029 1030 /** 1031 * Measures the distance in pixels between point a 1032 * and point b. 1033 * 1034 * @param {Object} a point with x/y properties 1035 * @param {Object} b point with x/y properties 1036 */ 1037 function distanceBetween( a, b ) { 1038 1039 var dx = a.x - b.x, 1040 dy = a.y - b.y; 1041 1042 return Math.sqrt( dx*dx + dy*dy ); 1043 1044 } 1045 1046 /** 1047 * Applies a CSS transform to the target element. 1048 */ 1049 function transformElement( element, transform ) { 1050 1051 element.style.WebkitTransform = transform; 1052 element.style.MozTransform = transform; 1053 element.style.msTransform = transform; 1054 element.style.OTransform = transform; 1055 element.style.transform = transform; 1056 1057 } 1058
1059 /** 1060 * Injects the given CSS styles into the DOM. 1061 */ 1062 function injectStyleSheet( value ) { 1063 1064 var tag = document.createElement( 'style' ); 1065 tag.type = 'text/css'; 1066 if( tag.styleSheet ) { 1067 tag.styleSheet.cssText = value; 1068 } 1069 else { 1070 tag.appendChild( document.createTextNode( value ) ); 1071 } 1072 document.getElementsByTagName( 'head' )[0].appendChild( tag ); 1073 1074 } 1075 1076 /** 1077 * Measures the distance in pixels between point a and point b. 1078 * 1079 * @param {String} color The string representation of a color, 1080 * the following formats are supported: 1081 * - #000 1082 * - #000000 1083 * - rgb(0,0,0) 1084 */ 1085 function colorToRgb( color ) { 1086 1087 var hex3 = color.match( /^#([0-9a-f]{3})$/i ); 1088 if( hex3 && hex3[1] ) { 1089 hex3 = hex3[1]; 1090 return { 1091 r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11, 1092 g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11, 1093 b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11 1094 }; 1095 } 1096 1097 var hex6 = color.match( /^#([0-9a-f]{6})$/i ); 1098 if( hex6 && hex6[1] ) { 1099 hex6 = hex6[1]; 1100 return { 1101 r: parseInt( hex6.substr( 0, 2 ), 16 ), 1102 g: parseInt( hex6.substr( 2, 2 ), 16 ), 1103 b: parseInt( hex6.substr( 4, 2 ), 16 ) 1104 }; 1105 } 1106 1107 var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i ); 1108 if( rgb ) { 1109 return { 1110 r: parseInt( rgb[1], 10 ), 1111 g: parseInt( rgb[2], 10 ), 1112 b: parseInt( rgb[3], 10 ) 1113 }; 1114 } 1115 1116 var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i ); 1117 if( rgba ) { 1118 return { 1119 r: parseInt( rgba[1], 10 ), 1120 g: parseInt( rgba[2], 10 ), 1121 b: parseInt( rgba[3], 10 ), 1122 a: parseFloat( rgba[4] ) 1123 }; 1124 } 1125 1126 return null; 1127 1128 } 1129 1130 /** 1131 * Calculates brightness on a scale of 0-255. 1132 * 1133 * @param color See colorStringToRgb for supported formats. 1134 */ 1135 function colorBrightness( color ) { 1136 1137 if( typeof color === 'string' ) color = colorToRgb( color ); 1138 1139 if( color ) { 1140 return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000; 1141 } 1142 1143 return null; 1144 1145 } 1146 1147 /** 1148 * Retrieves the height of the given element by looking 1149 * at the position and height of its immediate children. 1150 */ 1151 function getAbsoluteHeight( element ) { 1152 1153 var height = 0; 1154 1155 if( element ) { 1156 var absoluteChildren = 0; 1157 1158 toArray( element.childNodes ).forEach( function( child ) { 1159 1160 if( typeof child.offsetTop === 'number' && child.style ) { 1161 // Count # of abs children 1162 if( window.getComputedStyle( child ).position === 'absolute' ) { 1163 absoluteChildren += 1; 1164 } 1165 1166 height = Math.max( height, child.offsetTop + child.offsetHeight ); 1167 } 1168 1169 } ); 1170 1171 // If there are no absolute children, use offsetHeight 1172 if( absoluteChildren === 0 ) { 1173 height = element.offsetHeight; 1174 } 1175 1176 } 1177 1178 return height; 1179 1180 } 1181 1182 /** 1183 * Returns the remaining height within the parent of the 1184 * target element. 1185 * 1186 * remaining height = [ configured parent height ] - [ current parent height ] 1187 */ 1188 function getRemainingHeight( element, height ) { 1189 1190 height = height || 0; 1191 1192 if( element ) { 1193 var newHeight, oldHeight = element.style.height; 1194 1195 // Change the .stretch element height to 0 in order find the height of all 1196 // the other elements 1197 element.style.height = '0px'; 1198 newHeight = height - element.parentNode.offsetHeight; 1199 1200 // Restore the old height, just in case 1201 element.style.height = oldHeight + 'px'; 1202 1203 return newHeight; 1204 } 1205 1206 return height; 1207 1208 } 1209 1210 /** 1211 * Checks if this instance is being used to print a PDF. 1212 */ 1213 function isPrintingPDF() { 1214 1215 return ( /print-pdf/gi ).test( window.location.search ); 1216 1217 } 1218 1219 /** 1220 * Hides the address bar if we're on a mobile device. 1221 */ 1222 function hideAddressBar() { 1223 1224 if( config.hideAddressBar && isMobileDevice ) { 1225 // Events that should trigger the address bar to hide 1226 window.addEventListener( 'load', removeAddressBar, false ); 1227 window.addEventListener( 'orientationchange', removeAddressBar, false ); 1228 } 1229 1230 } 1231 1232 /** 1233 * Causes the address bar to hide on mobile devices, 1234 * more vertical space ftw. 1235 */ 1236 function removeAddressBar() { 1237 1238 setTimeout( function() { 1239 window.scrollTo( 0, 1 ); 1240 }, 10 ); 1241 1242 } 1243 1244 /** 1245 * Dispatches an event of the specified type from the 1246 * reveal DOM element. 1247 */ 1248 function dispatchEvent( type, args ) { 1249 1250 var event = document.createEvent( 'HTMLEvents', 1, 2 ); 1251 event.initEvent( type, true, true ); 1252 extend( event, args ); 1253 dom.wrapper.dispatchEvent( event ); 1254 1255 // If we're in an iframe, post each reveal.js event to the 1256 // parent window. Used by the notes plugin 1257 if( config.postMessageEvents && window.parent !== window.self ) { 1258 window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' ); 1259 } 1260 1261 } 1262
1263 /** 1264 * Wrap all links in 3D goodness. 1265 */ 1266 function enableRollingLinks() { 1267 1268 if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) { 1269 var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' ); 1270 1271 for( var i = 0, len = anchors.length; i < len; i++ ) { 1272 var anchor = anchors[i]; 1273 1274 if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) { 1275 var span = document.createElement('span'); 1276 span.setAttribute('data-title', anchor.text); 1277 span.innerHTML = anchor.innerHTML; 1278 1279 anchor.classList.add( 'roll' ); 1280 anchor.innerHTML = ''; 1281 anchor.appendChild(span); 1282 } 1283 } 1284 } 1285 1286 } 1287 1288 /** 1289 * Unwrap all 3D links. 1290 */ 1291 function disableRollingLinks() { 1292 1293 var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' ); 1294 1295 for( var i = 0, len = anchors.length; i < len; i++ ) { 1296 var anchor = anchors[i]; 1297 var span = anchor.querySelector( 'span' ); 1298 1299 if( span ) { 1300 anchor.classList.remove( 'roll' ); 1301 anchor.innerHTML = span.innerHTML; 1302 } 1303 } 1304 1305 } 1306 1307 /** 1308 * Bind preview frame links. 1309 */ 1310 function enablePreviewLinks( selector ) { 1311 1312 var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) ); 1313 1314 anchors.forEach( function( element ) { 1315 if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { 1316 element.addEventListener( 'click', onPreviewLinkClicked, false ); 1317 } 1318 } ); 1319 1320 } 1321 1322 /** 1323 * Unbind preview frame links. 1324 */ 1325 function disablePreviewLinks() { 1326 1327 var anchors = toArray( document.querySelectorAll( 'a' ) ); 1328 1329 anchors.forEach( function( element ) { 1330 if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { 1331 element.removeEventListener( 'click', onPreviewLinkClicked, false ); 1332 } 1333 } ); 1334 1335 } 1336 1337 /** 1338 * Opens a preview window for the target URL. 1339 */ 1340 function showPreview( url ) { 1341 1342 closeOverlay(); 1343 1344 dom.overlay = document.createElement( 'div' ); 1345 dom.overlay.classList.add( 'overlay' ); 1346 dom.overlay.classList.add( 'overlay-preview' ); 1347 dom.wrapper.appendChild( dom.overlay ); 1348 1349 dom.overlay.innerHTML = [ 1350 '<header>', 1351 '<a class="close" href="#"><span class="icon"></span></a>', 1352 '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>', 1353 '</header>', 1354 '<div class="spinner"></div>', 1355 '<div class="viewport">', 1356 '<iframe src="'+ url +'"></iframe>', 1357 '</div>' 1358 ].join(''); 1359 1360 dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) { 1361 dom.overlay.classList.add( 'loaded' ); 1362 }, false ); 1363 1364 dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { 1365 closeOverlay(); 1366 event.preventDefault(); 1367 }, false ); 1368 1369 dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) { 1370 closeOverlay(); 1371 }, false ); 1372 1373 setTimeout( function() { 1374 dom.overlay.classList.add( 'visible' ); 1375 }, 1 ); 1376 1377 } 1378 1379 /** 1380 * Opens a overlay window with help material. 1381 */ 1382 function showHelp() { 1383 1384 if( config.help ) { 1385 1386 closeOverlay(); 1387 1388 dom.overlay = document.createElement( 'div' ); 1389 dom.overlay.classList.add( 'overlay' ); 1390 dom.overlay.classList.add( 'overlay-help' ); 1391 dom.wrapper.appendChild( dom.overlay ); 1392 1393 var html = '<p class="title">Keyboard Shortcuts</p><br/>'; 1394 1395 html += '<table><th>KEY</th><th>ACTION</th>'; 1396 for( var key in keyboardShortcuts ) { 1397 html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>'; 1398 } 1399 1400 html += '</table>'; 1401 1402 dom.overlay.innerHTML = [ 1403 '<header>', 1404 '<a class="close" href="#"><span class="icon"></span></a>', 1405 '</header>', 1406 '<div class="viewport">', 1407 '<div class="viewport-inner">'+ html +'</div>', 1408 '</div>' 1409 ].join(''); 1410 1411 dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { 1412 closeOverlay(); 1413 event.preventDefault(); 1414 }, false ); 1415 1416 setTimeout( function() { 1417 dom.overlay.classList.add( 'visible' ); 1418 }, 1 ); 1419 1420 } 1421 1422 } 1423 1424 /** 1425 * Closes any currently open overlay. 1426 */ 1427 function closeOverlay() { 1428 1429 if( dom.overlay ) { 1430 dom.overlay.parentNode.removeChild( dom.overlay );
1431 dom.overlay = null; 1432 } 1433 1434 } 1435 1436 /** 1437 * Applies JavaScript-controlled layout rules to the 1438 * presentation. 1439 */ 1440 function layout() { 1441 1442 if( dom.wrapper && !isPrintingPDF() ) { 1443 1444 var size = getComputedSlideSize(); 1445 1446 var slidePadding = 20; // TODO Dig this out of DOM 1447 1448 // Layout the contents of the slides 1449 layoutSlideContents( config.width, config.height, slidePadding ); 1450 1451 dom.slides.style.width = size.width + 'px'; 1452 dom.slides.style.height = size.height + 'px'; 1453 1454 // Determine scale of content to fit within available space 1455 scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height ); 1456 1457 // Respect max/min scale settings 1458 scale = Math.max( scale, config.minScale ); 1459 scale = Math.min( scale, config.maxScale ); 1460 1461 // Don't apply any scaling styles if scale is 1 1462 if( scale === 1 ) { 1463 dom.slides.style.zoom = ''; 1464 dom.slides.style.left = ''; 1465 dom.slides.style.top = ''; 1466 dom.slides.style.bottom = ''; 1467 dom.slides.style.right = ''; 1468 transformElement( dom.slides, '' ); 1469 } 1470 else { 1471 // Prefer zooming in desktop Chrome so that content remains crisp 1472 if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) { 1473 dom.slides.style.zoom = scale; 1474 } 1475 // Apply scale transform as a fallback 1476 else { 1477 dom.slides.style.left = '50%'; 1478 dom.slides.style.top = '50%'; 1479 dom.slides.style.bottom = 'auto'; 1480 dom.slides.style.right = 'auto'; 1481 transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' ); 1482 } 1483 } 1484 1485 // Select all slides, vertical and horizontal 1486 var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ); 1487 1488 for( var i = 0, len = slides.length; i < len; i++ ) { 1489 var slide = slides[ i ]; 1490 1491 // Don't bother updating invisible slides 1492 if( slide.style.display === 'none' ) { 1493 continue; 1494 } 1495 1496 if( config.center || slide.classList.contains( 'center' ) ) { 1497 // Vertical stacks are not centred since their section 1498 // children will be 1499 if( slide.classList.contains( 'stack' ) ) { 1500 slide.style.top = 0; 1501 } 1502 else { 1503 slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px'; 1504 } 1505 } 1506 else { 1507 slide.style.top = ''; 1508 } 1509 1510 } 1511 1512 updateProgress(); 1513 updateParallax(); 1514 1515 } 1516 1517 } 1518 1519 /** 1520 * Applies layout logic to the contents of all slides in 1521 * the presentation. 1522 */ 1523 function layoutSlideContents( width, height, padding ) { 1524 1525 // Handle sizing of elements with the 'stretch' class 1526 toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) { 1527 1528 // Determine how much vertical space we can use 1529 var remainingHeight = getRemainingHeight( element, height ); 1530 1531 // Consider the aspect ratio of media elements 1532 if( /(img|video)/gi.test( element.nodeName ) ) { 1533 var nw = element.naturalWidth || element.videoWidth, 1534 nh = element.naturalHeight || element.videoHeight; 1535 1536 var es = Math.min( width / nw, remainingHeight / nh ); 1537 1538 element.style.width = ( nw * es ) + 'px'; 1539 element.style.height = ( nh * es ) + 'px'; 1540 1541 } 1542 else { 1543 element.style.width = width + 'px'; 1544 element.style.height = remainingHeight + 'px'; 1545 } 1546 1547 } ); 1548 1549 } 1550 1551 /** 1552 * Calculates the computed pixel size of our slides. These 1553 * values are based on the width and height configuration 1554 * options. 1555 */ 1556 function getComputedSlideSize( presentationWidth, presentationHeight ) { 1557 1558 var size = { 1559 // Slide size 1560 width: config.width, 1561 height: config.height, 1562 1563 // Presentation size 1564 presentationWidth: presentationWidth || dom.wrapper.offsetWidth, 1565 presentationHeight: presentationHeight || dom.wrapper.offsetHeight 1566 }; 1567 1568 // Reduce available space by margin 1569 size.presentationWidth -= ( size.presentationHeight * config.margin ); 1570 size.presentationHeight -= ( size.presentationHeight * config.margin ); 1571 1572 // Slide width may be a percentage of available width 1573 if( typeof size.width === 'string' && /%$/.test( size.width ) ) { 1574 size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth; 1575 } 1576 1577 // Slide height may be a percentage of available height 1578 if( typeof size.height === 'string' && /%$/.test( size.height ) ) { 1579 size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight; 1580 } 1581 1582 return size; 1583 1584 } 1585
1586 /** 1587 * Stores the vertical index of a stack so that the same 1588 * vertical slide can be selected when navigating to and 1589 * from the stack. 1590 * 1591 * @param {HTMLElement} stack The vertical stack element 1592 * @param {int} v Index to memorize 1593 */ 1594 function setPreviousVerticalIndex( stack, v ) { 1595 1596 if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { 1597 stack.setAttribute( 'data-previous-indexv', v || 0 ); 1598 } 1599 1600 } 1601 1602 /** 1603 * Retrieves the vertical index which was stored using 1604 * #setPreviousVerticalIndex() or 0 if no previous index 1605 * exists. 1606 * 1607 * @param {HTMLElement} stack The vertical stack element 1608 */ 1609 function getPreviousVerticalIndex( stack ) { 1610 1611 if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { 1612 // Prefer manually defined start-indexv 1613 var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv'; 1614 1615 return parseInt( stack.getAttribute( attributeName ) || 0, 10 ); 1616 } 1617 1618 return 0; 1619 1620 } 1621 1622 /** 1623 * Displays the overview of slides (quick nav) by 1624 * scaling down and arranging all slide elements. 1625 * 1626 * Experimental feature, might be dropped if perf 1627 * can't be improved. 1628 */ 1629 function activateOverview() { 1630 1631 // Only proceed if enabled in config 1632 if( config.overview ) { 1633 1634 // Don't auto-slide while in overview mode 1635 cancelAutoSlide(); 1636 1637 var wasActive = dom.wrapper.classList.contains( 'overview' ); 1638 1639 // Vary the depth of the overview based on screen size 1640 var depth = window.innerWidth < 400 ? 1000 : 2500; 1641 1642 dom.wrapper.classList.add( 'overview' ); 1643 dom.wrapper.classList.remove( 'overview-deactivating' ); 1644 1645 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); 1646 1647 for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) { 1648 var hslide = horizontalSlides[i], 1649 hoffset = config.rtl ? -105 : 105; 1650 1651 hslide.setAttribute( 'data-index-h', i ); 1652 1653 // Apply CSS transform 1654 transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' ); 1655 1656 if( hslide.classList.contains( 'stack' ) ) { 1657 1658 var verticalSlides = hslide.querySelectorAll( 'section' ); 1659 1660 for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) { 1661 var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide ); 1662 1663 var vslide = verticalSlides[j]; 1664 1665 vslide.setAttribute( 'data-index-h', i ); 1666 vslide.setAttribute( 'data-index-v', j ); 1667 1668 // Apply CSS transform 1669 transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' ); 1670 1671 // Navigate to this slide on click 1672 vslide.addEventListener( 'click', onOverviewSlideClicked, true ); 1673 } 1674 1675 } 1676 else { 1677 1678 // Navigate to this slide on click 1679 hslide.addEventListener( 'click', onOverviewSlideClicked, true ); 1680 1681 } 1682 } 1683 1684 updateSlidesVisibility(); 1685 1686 layout(); 1687 1688 if( !wasActive ) { 1689 // Notify observers of the overview showing 1690 dispatchEvent( 'overviewshown', { 1691 'indexh': indexh, 1692 'indexv': indexv, 1693 'currentSlide': currentSlide 1694 } ); 1695 } 1696 1697 } 1698 1699 } 1700 1701 /** 1702 * Exits the slide overview and enters the currently 1703 * active slide. 1704 */ 1705 function deactivateOverview() { 1706 1707 // Only proceed if enabled in config 1708 if( config.overview ) { 1709 1710 dom.wrapper.classList.remove( 'overview' ); 1711 1712 // Temporarily add a class so that transitions can do different things 1713 // depending on whether they are exiting/entering overview, or just 1714 // moving from slide to slide 1715 dom.wrapper.classList.add( 'overview-deactivating' ); 1716 1717 setTimeout( function () { 1718 dom.wrapper.classList.remove( 'overview-deactivating' ); 1719 }, 1 ); 1720 1721 // Select all slides 1722 toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { 1723 // Resets all transforms to use the external styles 1724 transformElement( slide, '' ); 1725 1726 slide.removeEventListener( 'click', onOverviewSlideClicked, true ); 1727 } ); 1728 1729 slide( indexh, indexv ); 1730 1731 cueAutoSlide(); 1732 1733 // Notify observers of the overview hiding 1734 dispatchEvent( 'overviewhidden', { 1735 'indexh': indexh, 1736 'indexv': indexv, 1737 'currentSlide': currentSlide 1738 } ); 1739 1740 } 1741 } 1742
1743 /** 1744 * Toggles the slide overview mode on and off. 1745 * 1746 * @param {Boolean} override Optional flag which overrides the 1747 * toggle logic and forcibly sets the desired state. True means 1748 * overview is open, false means it's closed. 1749 */ 1750 function toggleOverview( override ) { 1751 1752 if( typeof override === 'boolean' ) { 1753 override ? activateOverview() : deactivateOverview(); 1754 } 1755 else { 1756 isOverview() ? deactivateOverview() : activateOverview(); 1757 } 1758 1759 } 1760 1761 /** 1762 * Checks if the overview is currently active. 1763 * 1764 * @return {Boolean} true if the overview is active, 1765 * false otherwise 1766 */ 1767 function isOverview() { 1768 1769 return dom.wrapper.classList.contains( 'overview' ); 1770 1771 } 1772 1773 /** 1774 * Checks if the current or specified slide is vertical 1775 * (nested within another slide). 1776 * 1777 * @param {HTMLElement} slide [optional] The slide to check 1778 * orientation of 1779 */ 1780 function isVerticalSlide( slide ) { 1781 1782 // Prefer slide argument, otherwise use current slide 1783 slide = slide ? slide : currentSlide; 1784 1785 return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i ); 1786 1787 } 1788 1789 /** 1790 * Handling the fullscreen functionality via the fullscreen API 1791 * 1792 * @see http://fullscreen.spec.whatwg.org/ 1793 * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode 1794 */ 1795 function enterFullscreen() { 1796 1797 var element = document.body; 1798 1799 // Check which implementation is available 1800 var requestMethod = element.requestFullScreen || 1801 element.webkitRequestFullscreen || 1802 element.webkitRequestFullScreen || 1803 element.mozRequestFullScreen || 1804 element.msRequestFullscreen; 1805 1806 if( requestMethod ) { 1807 requestMethod.apply( element ); 1808 } 1809 1810 } 1811 1812 /** 1813 * Enters the paused mode which fades everything on screen to 1814 * black. 1815 */ 1816 function pause() { 1817 1818 if( config.pause ) { 1819 var wasPaused = dom.wrapper.classList.contains( 'paused' ); 1820 1821 cancelAutoSlide(); 1822 dom.wrapper.classList.add( 'paused' ); 1823 1824 if( wasPaused === false ) { 1825 dispatchEvent( 'paused' ); 1826 } 1827 } 1828 1829 } 1830 1831 /** 1832 * Exits from the paused mode. 1833 */ 1834 function resume() { 1835 1836 var wasPaused = dom.wrapper.classList.contains( 'paused' ); 1837 dom.wrapper.classList.remove( 'paused' ); 1838 1839 cueAutoSlide(); 1840 1841 if( wasPaused ) { 1842 dispatchEvent( 'resumed' ); 1843 } 1844 1845 } 1846 1847 /** 1848 * Toggles the paused mode on and off. 1849 */ 1850 function togglePause( override ) { 1851 1852 if( typeof override === 'boolean' ) { 1853 override ? pause() : resume(); 1854 } 1855 else { 1856 isPaused() ? resume() : pause(); 1857 } 1858 1859 } 1860 1861 /** 1862 * Checks if we are currently in the paused mode. 1863 */ 1864 function isPaused() { 1865 1866 return dom.wrapper.classList.contains( 'paused' ); 1867 1868 } 1869 1870 /** 1871 * Toggles the auto slide mode on and off. 1872 * 1873 * @param {Boolean} override Optional flag which sets the desired state. 1874 * True means autoplay starts, false means it stops. 1875 */ 1876 1877 function toggleAutoSlide( override ) { 1878 1879 if( typeof override === 'boolean' ) { 1880 override ? resumeAutoSlide() : pauseAutoSlide(); 1881 } 1882 1883 else { 1884 autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); 1885 } 1886 1887 } 1888 1889 /** 1890 * Checks if the auto slide mode is currently on. 1891 */ 1892 function isAutoSliding() { 1893 1894 return !!( autoSlide && !autoSlidePaused ); 1895 1896 } 1897 1898 /** 1899 * Steps from the current point in the presentation to the 1900 * slide which matches the specified horizontal and vertical 1901 * indices. 1902 * 1903 * @param {int} h Horizontal index of the target slide 1904 * @param {int} v Vertical index of the target slide 1905 * @param {int} f Optional index of a fragment within the 1906 * target slide to activate 1907 * @param {int} o Optional origin for use in multimaster environments 1908 */ 1909 function slide( h, v, f, o ) { 1910 1911 // Remember where we were at before 1912 previousSlide = currentSlide; 1913 1914 // Query all horizontal slides in the deck 1915 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); 1916 1917 // If no vertical index is specified and the upcoming slide is a 1918 // stack, resume at its previous vertical index 1919 if( v === undefined ) { 1920 v = getPreviousVerticalIndex( horizontalSlides[ h ] ); 1921 } 1922 1923 // If we were on a vertical stack, remember what vertical index 1924 // it was on so we can resume at the same position when returning 1925 if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) { 1926 setPreviousVerticalIndex( previousSlide.parentNode, indexv ); 1927 } 1928 1929 // Remember the state before this slide 1930 var stateBefore = state.concat(); 1931 1932 // Reset the state array 1933 state.length = 0; 1934 1935 var indexhBefore = indexh || 0, 1936 indexvBefore = indexv || 0; 1937 1938 // Activate and transition to the new slide 1939 indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h ); 1940 indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v ); 1941 1942 // Update the visibility of slides now that the indices have changed 1943 updateSlidesVisibility(); 1944 1945 layout(); 1946 1947 // Apply the new state 1948 stateLoop: for( var i = 0, len = state.length; i < len; i++ ) { 1949 // Check if this state existed on the previous slide. If it 1950 // did, we will avoid adding it repeatedly 1951 for( var j = 0; j < stateBefore.length; j++ ) { 1952 if( stateBefore[j] === state[i] ) { 1953 stateBefore.splice( j, 1 ); 1954 continue stateLoop; 1955 } 1956 } 1957
1958 document.documentElement.classList.add( state[i] ); 1959 1960 // Dispatch custom event matching the state's name 1961 dispatchEvent( state[i] ); 1962 } 1963 1964 // Clean up the remains of the previous state 1965 while( stateBefore.length ) { 1966 document.documentElement.classList.remove( stateBefore.pop() ); 1967 } 1968 1969 // If the overview is active, re-activate it to update positions 1970 if( isOverview() ) { 1971 activateOverview(); 1972 } 1973 1974 // Find the current horizontal slide and any possible vertical slides 1975 // within it 1976 var currentHorizontalSlide = horizontalSlides[ indexh ], 1977 currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' ); 1978 1979 // Store references to the previous and current slides 1980 currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide; 1981 1982 // Show fragment, if specified 1983 if( typeof f !== 'undefined' ) { 1984 navigateFragment( f ); 1985 } 1986 1987 // Dispatch an event if the slide changed 1988 var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); 1989 if( slideChanged ) { 1990 dispatchEvent( 'slidechanged', { 1991 'indexh': indexh, 1992 'indexv': indexv, 1993 'previousSlide': previousSlide, 1994 'currentSlide': currentSlide, 1995 'origin': o 1996 } ); 1997 } 1998 else { 1999 // Ensure that the previous slide is never the same as the current 2000 previousSlide = null; 2001 } 2002 2003 // Solves an edge case where the previous slide maintains the 2004 // 'present' class when navigating between adjacent vertical 2005 // stacks 2006 if( previousSlide ) { 2007 previousSlide.classList.remove( 'present' ); 2008 previousSlide.setAttribute( 'aria-hidden', 'true' ); 2009 2010 // Reset all slides upon navigate to home 2011 // Issue: #285 2012 if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) { 2013 // Launch async task 2014 setTimeout( function () { 2015 var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i; 2016 for( i in slides ) { 2017 if( slides[i] ) { 2018 // Reset stack 2019 setPreviousVerticalIndex( slides[i], 0 ); 2020 } 2021 } 2022 }, 0 ); 2023 } 2024 } 2025 2026 // Handle embedded content 2027 if( slideChanged || !previousSlide ) { 2028 stopEmbeddedContent( previousSlide ); 2029 startEmbeddedContent( currentSlide ); 2030 } 2031 2032 // Announce the current slide contents, for screen readers 2033 dom.statusDiv.textContent = currentSlide.textContent; 2034 2035 updateControls(); 2036 updateProgress();
2037 updateBackground(); 2038 updateParallax(); 2039 updateSlideNumber(); 2040 2041 // Update the URL hash 2042 writeURL(); 2043 2044 cueAutoSlide(); 2045 2046 } 2047 2048 /** 2049 * Syncs the presentation with the current DOM. Useful 2050 * when new slides or control elements are added or when 2051 * the configuration has changed. 2052 */ 2053 function sync() { 2054 2055 // Subscribe to input 2056 removeEventListeners(); 2057 addEventListeners(); 2058 2059 // Force a layout to make sure the current config is accounted for 2060 layout(); 2061 2062 // Reflect the current autoSlide value 2063 autoSlide = config.autoSlide; 2064 2065 // Start auto-sliding if it's enabled 2066 cueAutoSlide(); 2067 2068 // Re-create the slide backgrounds 2069 createBackgrounds(); 2070 2071 // Write the current hash to the URL 2072 writeURL(); 2073 2074 sortAllFragments(); 2075 2076 updateControls(); 2077 updateProgress(); 2078 updateBackground( true ); 2079 updateSlideNumber(); 2080 updateSlidesVisibility(); 2081 2082 formatEmbeddedContent(); 2083 2084 } 2085 2086 /** 2087 * Resets all vertical slides so that only the first 2088 * is visible. 2089 */ 2090 function resetVerticalSlides() { 2091 2092 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2093 horizontalSlides.forEach( function( horizontalSlide ) { 2094 2095 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 2096 verticalSlides.forEach( function( verticalSlide, y ) { 2097 2098 if( y > 0 ) { 2099 verticalSlide.classList.remove( 'present' ); 2100 verticalSlide.classList.remove( 'past' ); 2101 verticalSlide.classList.add( 'future' ); 2102 verticalSlide.setAttribute( 'aria-hidden', 'true' ); 2103 } 2104 2105 } ); 2106 2107 } ); 2108 2109 } 2110 2111 /** 2112 * Sorts and formats all of fragments in the 2113 * presentation. 2114 */ 2115 function sortAllFragments() { 2116 2117 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2118 horizontalSlides.forEach( function( horizontalSlide ) { 2119 2120 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 2121 verticalSlides.forEach( function( verticalSlide, y ) { 2122 2123 sortFragments( verticalSlide.querySelectorAll( '.fragment' ) ); 2124 2125 } ); 2126 2127 if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) ); 2128 2129 } ); 2130 2131 } 2132 2133 /** 2134 * Updates one dimension of slides by showing the slide 2135 * with the specified index. 2136 * 2137 * @param {String} selector A CSS selector that will fetch 2138 * the group of slides we are working with 2139 * @param {Number} index The index of the slide that should be 2140 * shown 2141 * 2142 * @return {Number} The index of the slide that is now shown, 2143 * might differ from the passed in index if it was out of 2144 * bounds. 2145 */ 2146 function updateSlides( selector, index ) { 2147 2148 // Select all slides and convert the NodeList result to 2149 // an array 2150 var slides = toArray( dom.wrapper.querySelectorAll( selector ) ), 2151 slidesLength = slides.length; 2152 2153 var printMode = isPrintingPDF(); 2154 2155 if( slidesLength ) { 2156 2157 // Should the index loop? 2158 if( config.loop ) { 2159 index %= slidesLength; 2160 2161 if( index < 0 ) { 2162 index = slidesLength + index; 2163 } 2164 } 2165 2166 // Enforce max and minimum index bounds 2167 index = Math.max( Math.min( index, slidesLength - 1 ), 0 ); 2168 2169 for( var i = 0; i < slidesLength; i++ ) { 2170 var element = slides[i]; 2171 2172 var reverse = config.rtl && !isVerticalSlide( element ); 2173 2174 element.classList.remove( 'past' ); 2175 element.classList.remove( 'present' ); 2176 element.classList.remove( 'future' ); 2177 2178 // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute 2179 element.setAttribute( 'hidden', '' ); 2180 element.setAttribute( 'aria-hidden', 'true' ); 2181 2182 // If this element contains vertical slides 2183 if( element.querySelector( 'section' ) ) { 2184 element.classList.add( 'stack' ); 2185 } 2186 2187 // If we're printing static slides, all slides are "present" 2188 if( printMode ) { 2189 element.classList.add( 'present' ); 2190 continue; 2191 } 2192 2193 if( i < index ) { 2194 // Any element previous to index is given the 'past' class 2195 element.classList.add( reverse ? 'future' : 'past' ); 2196 2197 if( config.fragments ) { 2198 var pastFragments = toArray( element.querySelectorAll( '.fragment' ) ); 2199 2200 // Show all fragments on prior slides 2201 while( pastFragments.length ) { 2202 var pastFragment = pastFragments.pop(); 2203 pastFragment.classList.add( 'visible' ); 2204 pastFragment.classList.remove( 'current-fragment' ); 2205 } 2206 } 2207 } 2208 else if( i > index ) { 2209 // Any element subsequent to index is given the 'future' class 2210 element.classList.add( reverse ? 'past' : 'future' ); 2211 2212 if( config.fragments ) { 2213 var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) ); 2214 2215 // No fragments in future slides should be visible ahead of time 2216 while( futureFragments.length ) { 2217 var futureFragment = futureFragments.pop(); 2218 futureFragment.classList.remove( 'visible' ); 2219 futureFragment.classList.remove( 'current-fragment' ); 2220 } 2221 } 2222 } 2223 } 2224 2225 // Mark the current slide as present 2226 slides[index].classList.add( 'present' ); 2227 slides[index].removeAttribute( 'hidden' ); 2228 slides[index].removeAttribute( 'aria-hidden' ); 2229 2230 // If this slide has a state associated with it, add it 2231 // onto the current state of the deck 2232 var slideState = slides[index].getAttribute( 'data-state' ); 2233 if( slideState ) { 2234 state = state.concat( slideState.split( ' ' ) ); 2235 } 2236 2237 } 2238 else { 2239 // Since there are no slides we can't be anywhere beyond the 2240 // zeroth index 2241 index = 0; 2242 } 2243 2244 return index; 2245 2246 } 2247
2248 /** 2249 * Optimization method; hide all slides that are far away 2250 * from the present slide. 2251 */ 2252 function updateSlidesVisibility() { 2253 2254 // Select all slides and convert the NodeList result to 2255 // an array 2256 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ), 2257 horizontalSlidesLength = horizontalSlides.length, 2258 distanceX, 2259 distanceY; 2260 2261 if( horizontalSlidesLength && typeof indexh !== 'undefined' ) { 2262 2263 // The number of steps away from the present slide that will 2264 // be visible 2265 var viewDistance = isOverview() ? 10 : config.viewDistance; 2266 2267 // Limit view distance on weaker devices 2268 if( isMobileDevice ) { 2269 viewDistance = isOverview() ? 6 : 2; 2270 } 2271 2272 // Limit view distance on weaker devices 2273 if( isPrintingPDF() ) { 2274 viewDistance = Number.MAX_VALUE; 2275 } 2276 2277 for( var x = 0; x < horizontalSlidesLength; x++ ) { 2278 var horizontalSlide = horizontalSlides[x]; 2279 2280 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), 2281 verticalSlidesLength = verticalSlides.length; 2282 2283 // Loops so that it measures 1 between the first and last slides 2284 distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0; 2285 2286 // Show the horizontal slide if it's within the view distance 2287 if( distanceX < viewDistance ) { 2288 showSlide( horizontalSlide ); 2289 } 2290 else { 2291 hideSlide( horizontalSlide ); 2292 } 2293 2294 if( verticalSlidesLength ) { 2295 2296 var oy = getPreviousVerticalIndex( horizontalSlide ); 2297 2298 for( var y = 0; y < verticalSlidesLength; y++ ) { 2299 var verticalSlide = verticalSlides[y]; 2300 2301 distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy ); 2302 2303 if( distanceX + distanceY < viewDistance ) { 2304 showSlide( verticalSlide ); 2305 } 2306 else { 2307 hideSlide( verticalSlide ); 2308 } 2309 } 2310 2311 } 2312 } 2313 2314 } 2315 2316 } 2317 2318 /** 2319 * Updates the progress bar to reflect the current slide. 2320 */ 2321 function updateProgress() { 2322 2323 // Update progress if enabled 2324 if( config.progress && dom.progressbar ) { 2325 2326 dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px'; 2327 2328 } 2329 2330 } 2331 2332 /** 2333 * Updates the slide number div to reflect the current slide. 2334 */ 2335 function updateSlideNumber() { 2336 2337 // Update slide number if enabled 2338 if( config.slideNumber && dom.slideNumber) { 2339 2340 // Display the number of the page using 'indexh - indexv' format 2341 var indexString = indexh; 2342 if( indexv > 0 ) { 2343 indexString += ' - ' + indexv; 2344 } 2345 2346 dom.slideNumber.innerHTML = indexString; 2347 } 2348 2349 } 2350 2351 /** 2352 * Updates the state of all control/navigation arrows. 2353 */ 2354 function updateControls() { 2355 2356 var routes = availableRoutes(); 2357 var fragments = availableFragments(); 2358 2359 // Remove the 'enabled' class from all directions 2360 dom.controlsLeft.concat( dom.controlsRight ) 2361 .concat( dom.controlsUp ) 2362 .concat( dom.controlsDown ) 2363 .concat( dom.controlsPrev ) 2364 .concat( dom.controlsNext ).forEach( function( node ) { 2365 node.classList.remove( 'enabled' ); 2366 node.classList.remove( 'fragmented' ); 2367 } ); 2368 2369 // Add the 'enabled' class to the available routes 2370 if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2371 if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2372 if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2373 if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2374 2375 // Prev/next buttons 2376 if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2377 if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } ); 2378 2379 // Highlight fragment directions 2380 if( currentSlide ) { 2381 2382 // Always apply fragment decorator to prev/next buttons 2383 if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2384 if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2385 2386 // Apply fragment decorators to directional buttons based on 2387 // what slide axis they are in 2388 if( isVerticalSlide( currentSlide ) ) {
2389 if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2390 if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2391 } 2392 else { 2393 if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2394 if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); 2395 } 2396 2397 } 2398 2399 } 2400 2401 /** 2402 * Updates the background elements to reflect the current 2403 * slide. 2404 * 2405 * @param {Boolean} includeAll If true, the backgrounds of 2406 * all vertical slides (not just the present) will be updated. 2407 */ 2408 function updateBackground( includeAll ) { 2409 2410 var currentBackground = null; 2411 2412 // Reverse past/future classes when in RTL mode 2413 var horizontalPast = config.rtl ? 'future' : 'past', 2414 horizontalFuture = config.rtl ? 'past' : 'future'; 2415 2416 // Update the classes of all backgrounds to match the 2417 // states of their slides (past/present/future) 2418 toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) { 2419 2420 backgroundh.classList.remove( 'past' ); 2421 backgroundh.classList.remove( 'present' ); 2422 backgroundh.classList.remove( 'future' ); 2423 2424 if( h < indexh ) { 2425 backgroundh.classList.add( horizontalPast ); 2426 } 2427 else if ( h > indexh ) { 2428 backgroundh.classList.add( horizontalFuture ); 2429 } 2430 else { 2431 backgroundh.classList.add( 'present' ); 2432 2433 // Store a reference to the current background element 2434 currentBackground = backgroundh; 2435 } 2436 2437 if( includeAll || h === indexh ) { 2438 toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) { 2439 2440 backgroundv.classList.remove( 'past' ); 2441 backgroundv.classList.remove( 'present' ); 2442 backgroundv.classList.remove( 'future' ); 2443 2444 if( v < indexv ) { 2445 backgroundv.classList.add( 'past' ); 2446 } 2447 else if ( v > indexv ) { 2448 backgroundv.classList.add( 'future' ); 2449 } 2450 else { 2451 backgroundv.classList.add( 'present' ); 2452 2453 // Only if this is the present horizontal and vertical slide 2454 if( h === indexh ) currentBackground = backgroundv; 2455 } 2456 2457 } ); 2458 } 2459 2460 } ); 2461 2462 // Stop any currently playing video background 2463 if( previousBackground ) { 2464 2465 var previousVideo = previousBackground.querySelector( 'video' ); 2466 if( previousVideo ) previousVideo.pause(); 2467 2468 } 2469 2470 if( currentBackground ) { 2471 2472 // Start video playback 2473 var currentVideo = currentBackground.querySelector( 'video' ); 2474 if( currentVideo ) { 2475 currentVideo.currentTime = 0; 2476 currentVideo.play(); 2477 } 2478 2479 // Don't transition between identical backgrounds. This 2480 // prevents unwanted flicker. 2481 var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null; 2482 var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' ); 2483 if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) { 2484 dom.background.classList.add( 'no-transition' ); 2485 } 2486 2487 previousBackground = currentBackground; 2488 2489 } 2490 2491 // If there's a background brightness flag for this slide, 2492 // bubble it to the .reveal container 2493 if( currentSlide ) { 2494 [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) { 2495 if( currentSlide.classList.contains( classToBubble ) ) { 2496 dom.wrapper.classList.add( classToBubble ); 2497 } 2498 else { 2499 dom.wrapper.classList.remove( classToBubble ); 2500 } 2501 } ); 2502 } 2503 2504 // Allow the first background to apply without transition 2505 setTimeout( function() { 2506 dom.background.classList.remove( 'no-transition' ); 2507 }, 1 ); 2508 2509 } 2510 2511 /** 2512 * Updates the position of the parallax background based 2513 * on the current slide index. 2514 */ 2515 function updateParallax() { 2516 2517 if( config.parallaxBackgroundImage ) { 2518 2519 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), 2520 verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); 2521 2522 var backgroundSize = dom.background.style.backgroundSize.split( ' ' ), 2523 backgroundWidth, backgroundHeight; 2524 2525 if( backgroundSize.length === 1 ) { 2526 backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 ); 2527 } 2528 else { 2529 backgroundWidth = parseInt( backgroundSize[0], 10 ); 2530 backgroundHeight = parseInt( backgroundSize[1], 10 ); 2531 } 2532 2533 var slideWidth = dom.background.offsetWidth; 2534 var horizontalSlideCount = horizontalSlides.length; 2535 var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh; 2536 2537 var slideHeight = dom.background.offsetHeight; 2538 var verticalSlideCount = verticalSlides.length; 2539 var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0; 2540 2541 dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px'; 2542 2543 } 2544 2545 } 2546
2547 /** 2548 * Called when the given slide is within the configured view 2549 * distance. Shows the slide element and loads any content 2550 * that is set to load lazily (data-src). 2551 */ 2552 function showSlide( slide ) { 2553 2554 // Show the slide element 2555 slide.style.display = 'block'; 2556 2557 // Media elements with data-src attributes 2558 toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) { 2559 element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); 2560 element.removeAttribute( 'data-src' ); 2561 } ); 2562 2563 // Media elements with <source> children 2564 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) { 2565 var sources = 0; 2566 2567 toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) { 2568 source.setAttribute( 'src', source.getAttribute( 'data-src' ) ); 2569 source.removeAttribute( 'data-src' ); 2570 sources += 1; 2571 } ); 2572 2573 // If we rewrote sources for this video/audio element, we need 2574 // to manually tell it to load from its new origin 2575 if( sources > 0 ) { 2576 media.load(); 2577 } 2578 } ); 2579 2580 2581 // Show the corresponding background element 2582 var indices = getIndices( slide ); 2583 var background = getSlideBackground( indices.h, indices.v ); 2584 if( background ) { 2585 background.style.display = 'block'; 2586 2587 // If the background contains media, load it 2588 if( background.hasAttribute( 'data-loaded' ) === false ) { 2589 background.setAttribute( 'data-loaded', 'true' ); 2590 2591 var backgroundImage = slide.getAttribute( 'data-background-image' ), 2592 backgroundVideo = slide.getAttribute( 'data-background-video' ), 2593 backgroundIframe = slide.getAttribute( 'data-background-iframe' ); 2594 2595 // Images 2596 if( backgroundImage ) { 2597 background.style.backgroundImage = 'url('+ backgroundImage +')'; 2598 } 2599 // Videos 2600 else if ( backgroundVideo && !isSpeakerNotes() ) { 2601 var video = document.createElement( 'video' ); 2602 2603 // Support comma separated lists of video sources 2604 backgroundVideo.split( ',' ).forEach( function( source ) { 2605 video.innerHTML += '<source src="'+ source +'">'; 2606 } ); 2607 2608 background.appendChild( video ); 2609 } 2610 // Iframes 2611 else if ( backgroundIframe ) { 2612 var iframe = document.createElement( 'iframe' ); 2613 iframe.setAttribute( 'src', backgroundIframe ); 2614 iframe.style.width = '100%'; 2615 iframe.style.height = '100%'; 2616 iframe.style.maxHeight = '100%'; 2617 iframe.style.maxWidth = '100%'; 2618 2619 background.appendChild( iframe ); 2620 } 2621 } 2622 } 2623 2624 } 2625 2626 /** 2627 * Called when the given slide is moved outside of the 2628 * configured view distance. 2629 */ 2630 function hideSlide( slide ) { 2631 2632 // Hide the slide element 2633 slide.style.display = 'none'; 2634 2635 // Hide the corresponding background element 2636 var indices = getIndices( slide ); 2637 var background = getSlideBackground( indices.h, indices.v ); 2638 if( background ) { 2639 background.style.display = 'none'; 2640 } 2641 2642 } 2643 2644 /** 2645 * Determine what available routes there are for navigation. 2646 * 2647 * @return {Object} containing four booleans: left/right/up/down 2648 */ 2649 function availableRoutes() { 2650 2651 var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), 2652 verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); 2653 2654 var routes = { 2655 left: indexh > 0 || config.loop, 2656 right: indexh < horizontalSlides.length - 1 || config.loop, 2657 up: indexv > 0, 2658 down: indexv < verticalSlides.length - 1 2659 }; 2660 2661 // reverse horizontal controls for rtl 2662 if( config.rtl ) { 2663 var left = routes.left; 2664 routes.left = routes.right; 2665 routes.right = left; 2666 } 2667 2668 return routes; 2669 2670 } 2671 2672 /** 2673 * Returns an object describing the available fragment 2674 * directions. 2675 * 2676 * @return {Object} two boolean properties: prev/next 2677 */ 2678 function availableFragments() { 2679 2680 if( currentSlide && config.fragments ) { 2681 var fragments = currentSlide.querySelectorAll( '.fragment' ); 2682 var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' ); 2683 2684 return { 2685 prev: fragments.length - hiddenFragments.length > 0, 2686 next: !!hiddenFragments.length 2687 }; 2688 } 2689 else { 2690 return { prev: false, next: false }; 2691 } 2692 2693 } 2694
2695 /** 2696 * Enforces origin-specific format rules for embedded media. 2697 */ 2698 function formatEmbeddedContent() { 2699 2700 // YouTube frames must include "?enablejsapi=1" 2701 toArray( dom.slides.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { 2702 var src = el.getAttribute( 'src' ); 2703 if( !/enablejsapi\=1/gi.test( src ) ) { 2704 el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'enablejsapi=1' ); 2705 } 2706 }); 2707 2708 // Vimeo frames must include "?api=1" 2709 toArray( dom.slides.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { 2710 var src = el.getAttribute( 'src' ); 2711 if( !/api\=1/gi.test( src ) ) { 2712 el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'api=1' ); 2713 } 2714 }); 2715 2716 } 2717 2718 /** 2719 * Start playback of any embedded content inside of 2720 * the targeted slide. 2721 */ 2722 function startEmbeddedContent( slide ) { 2723 2724 if( slide && !isSpeakerNotes() ) { 2725 // HTML5 media elements 2726 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 2727 if( el.hasAttribute( 'data-autoplay' ) ) { 2728 el.play(); 2729 } 2730 } ); 2731 2732 // iframe embeds 2733 toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) { 2734 el.contentWindow.postMessage( 'slide:start', '*' ); 2735 }); 2736 2737 // YouTube embeds 2738 toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { 2739 if( el.hasAttribute( 'data-autoplay' ) ) { 2740 el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); 2741 } 2742 }); 2743 2744 // Vimeo embeds 2745 toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { 2746 if( el.hasAttribute( 'data-autoplay' ) ) { 2747 el.contentWindow.postMessage( '{"method":"play"}', '*' ); 2748 } 2749 }); 2750 } 2751 2752 } 2753 2754 /** 2755 * Stop playback of any embedded content inside of 2756 * the targeted slide. 2757 */ 2758 function stopEmbeddedContent( slide ) { 2759 2760 if( slide && slide.parentNode ) { 2761 // HTML5 media elements 2762 toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 2763 if( !el.hasAttribute( 'data-ignore' ) ) { 2764 el.pause(); 2765 } 2766 } ); 2767 2768 // iframe embeds 2769 toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) { 2770 el.contentWindow.postMessage( 'slide:stop', '*' ); 2771 }); 2772 2773 // YouTube embeds 2774 toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { 2775 if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) { 2776 el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' ); 2777 } 2778 }); 2779 2780 // Vimeo embeds 2781 toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { 2782 if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) { 2783 el.contentWindow.postMessage( '{"method":"pause"}', '*' ); 2784 } 2785 }); 2786 } 2787 2788 } 2789 2790 /** 2791 * Returns a value ranging from 0-1 that represents 2792 * how far into the presentation we have navigated. 2793 */ 2794 function getProgress() { 2795 2796 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2797 2798 // The number of past and total slides 2799 var totalCount = getTotalSlides(); 2800 var pastCount = 0; 2801 2802 // Step through all slides and count the past ones 2803 mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) { 2804 2805 var horizontalSlide = horizontalSlides[i]; 2806 var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); 2807 2808 for( var j = 0; j < verticalSlides.length; j++ ) { 2809 2810 // Stop as soon as we arrive at the present 2811 if( verticalSlides[j].classList.contains( 'present' ) ) { 2812 break mainLoop; 2813 } 2814 2815 pastCount++; 2816 2817 } 2818 2819 // Stop as soon as we arrive at the present 2820 if( horizontalSlide.classList.contains( 'present' ) ) { 2821 break; 2822 } 2823 2824 // Don't count the wrapping section for vertical slides 2825 if( horizontalSlide.classList.contains( 'stack' ) === false ) { 2826 pastCount++; 2827 } 2828 2829 } 2830 2831 if( currentSlide ) { 2832 2833 var allFragments = currentSlide.querySelectorAll( '.fragment' ); 2834 2835 // If there are fragments in the current slide those should be 2836 // accounted for in the progress. 2837 if( allFragments.length > 0 ) { 2838 var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' ); 2839 2840 // This value represents how big a portion of the slide progress 2841 // that is made up by its fragments (0-1) 2842 var fragmentWeight = 0.9; 2843 2844 // Add fragment progress to the past slide count 2845 pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight; 2846 } 2847 2848 } 2849 2850 return pastCount / ( totalCount - 1 ); 2851 2852 } 2853
2854 /** 2855 * Checks if this presentation is running inside of the 2856 * speaker notes window. 2857 */ 2858 function isSpeakerNotes() { 2859 2860 return !!window.location.search.match( /receiver/gi ); 2861 2862 } 2863 2864 /** 2865 * Reads the current URL (hash) and navigates accordingly. 2866 */ 2867 function readURL() { 2868 2869 var hash = window.location.hash; 2870 2871 // Attempt to parse the hash as either an index or name 2872 var bits = hash.slice( 2 ).split( '/' ), 2873 name = hash.replace( /#|\//gi, '' ); 2874 2875 // If the first bit is invalid and there is a name we can 2876 // assume that this is a named link 2877 if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) { 2878 var element; 2879 2880 // Ensure the named link is a valid HTML ID attribute 2881 if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) { 2882 // Find the slide with the specified ID 2883 element = document.querySelector( '#' + name ); 2884 } 2885 2886 if( element ) { 2887 // Find the position of the named slide and navigate to it 2888 var indices = Reveal.getIndices( element ); 2889 slide( indices.h, indices.v ); 2890 } 2891 // If the slide doesn't exist, navigate to the current slide 2892 else { 2893 slide( indexh || 0, indexv || 0 ); 2894 } 2895 } 2896 else { 2897 // Read the index components of the hash 2898 var h = parseInt( bits[0], 10 ) || 0, 2899 v = parseInt( bits[1], 10 ) || 0; 2900 2901 if( h !== indexh || v !== indexv ) { 2902 slide( h, v ); 2903 } 2904 } 2905 2906 } 2907 2908 /** 2909 * Updates the page URL (hash) to reflect the current 2910 * state. 2911 * 2912 * @param {Number} delay The time in ms to wait before 2913 * writing the hash 2914 */ 2915 function writeURL( delay ) { 2916 2917 if( config.history ) { 2918 2919 // Make sure there's never more than one timeout running 2920 clearTimeout( writeURLTimeout ); 2921 2922 // If a delay is specified, timeout this call 2923 if( typeof delay === 'number' ) { 2924 writeURLTimeout = setTimeout( writeURL, delay ); 2925 } 2926 else if( currentSlide ) { 2927 var url = '/'; 2928 2929 // Attempt to create a named link based on the slide's ID 2930 var id = currentSlide.getAttribute( 'id' ); 2931 if( id ) { 2932 id = id.toLowerCase(); 2933 id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' ); 2934 } 2935 2936 // If the current slide has an ID, use that as a named link 2937 if( typeof id === 'string' && id.length ) { 2938 url = '/' + id; 2939 } 2940 // Otherwise use the /h/v index 2941 else { 2942 if( indexh > 0 || indexv > 0 ) url += indexh; 2943 if( indexv > 0 ) url += '/' + indexv; 2944 } 2945 2946 window.location.hash = url; 2947 } 2948 } 2949 2950 } 2951 2952 /** 2953 * Retrieves the h/v location of the current, or specified, 2954 * slide. 2955 * 2956 * @param {HTMLElement} slide If specified, the returned 2957 * index will be for this slide rather than the currently 2958 * active one 2959 * 2960 * @return {Object} { h: <int>, v: <int>, f: <int> } 2961 */ 2962 function getIndices( slide ) { 2963 2964 // By default, return the current indices 2965 var h = indexh, 2966 v = indexv, 2967 f; 2968 2969 // If a slide is specified, return the indices of that slide 2970 if( slide ) { 2971 var isVertical = isVerticalSlide( slide ); 2972 var slideh = isVertical ? slide.parentNode : slide; 2973 2974 // Select all horizontal slides 2975 var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); 2976
2977 // Now that we know which the horizontal slide is, get its index 2978 h = Math.max( horizontalSlides.indexOf( slideh ), 0 ); 2979 2980 // Assume we're not vertical 2981 v = undefined; 2982 2983 // If this is a vertical slide, grab the vertical index 2984 if( isVertical ) { 2985 v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 ); 2986 } 2987 } 2988 2989 if( !slide && currentSlide ) { 2990 var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0; 2991 if( hasFragments ) { 2992 var currentFragment = currentSlide.querySelector( '.current-fragment' ); 2993 if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) { 2994 f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 ); 2995 } 2996 else { 2997 f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1; 2998 } 2999 } 3000 } 3001 3002 return { h: h, v: v, f: f }; 3003 3004 } 3005 3006 /** 3007 * Retrieves the total number of slides in this presentation. 3008 */ 3009 function getTotalSlides() { 3010 3011 return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length; 3012 3013 } 3014 3015 /** 3016 * Returns the slide element matching the specified index. 3017 */ 3018 function getSlide( x, y ) { 3019 3020 var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ]; 3021 var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' ); 3022 3023 if( verticalSlides && verticalSlides.length && typeof y === 'number' ) { 3024 return verticalSlides ? verticalSlides[ y ] : undefined; 3025 } 3026 3027 return horizontalSlide; 3028 3029 } 3030 3031 /** 3032 * Returns the background element for the given slide. 3033 * All slides, even the ones with no background properties 3034 * defined, have a background element so as long as the 3035 * index is valid an element will be returned. 3036 */ 3037 function getSlideBackground( x, y ) { 3038 3039 // When printing to PDF the slide backgrounds are nested 3040 // inside of the slides 3041 if( isPrintingPDF() ) { 3042 var slide = getSlide( x, y ); 3043 if( slide ) { 3044 var background = slide.querySelector( '.slide-background' ); 3045 if( background && background.parentNode === slide ) { 3046 return background; 3047 } 3048 } 3049 3050 return undefined; 3051 } 3052 3053 var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ]; 3054 var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' ); 3055 3056 if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) { 3057 return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined; 3058 } 3059 3060 return horizontalBackground; 3061 3062 } 3063 3064 /** 3065 * Retrieves the current state of the presentation as 3066 * an object. This state can then be restored at any 3067 * time. 3068 */ 3069 function getState() { 3070 3071 var indices = getIndices(); 3072 3073 return { 3074 indexh: indices.h, 3075 indexv: indices.v, 3076 indexf: indices.f, 3077 paused: isPaused(), 3078 overview: isOverview() 3079 }; 3080 3081 } 3082 3083 /** 3084 * Restores the presentation to the given state. 3085 * 3086 * @param {Object} state As generated by getState() 3087 */ 3088 function setState( state ) { 3089 3090 if( typeof state === 'object' ) { 3091 slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) ); 3092 3093 var pausedFlag = deserialize( state.paused ), 3094 overviewFlag = deserialize( state.overview ); 3095 3096 if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) { 3097 togglePause( pausedFlag ); 3098 } 3099 3100 if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) { 3101 toggleOverview( overviewFlag ); 3102 } 3103 } 3104 3105 } 3106 3107 /** 3108 * Return a sorted fragments list, ordered by an increasing 3109 * "data-fragment-index" attribute. 3110 * 3111 * Fragments will be revealed in the order that they are returned by 3112 * this function, so you can use the index attributes to control the 3113 * order of fragment appearance. 3114 * 3115 * To maintain a sensible default fragment order, fragments are presumed 3116 * to be passed in document order. This function adds a "fragment-index" 3117 * attribute to each node if such an attribute is not already present, 3118 * and sets that attribute to an integer value which is the position of 3119 * the fragment within the fragments list. 3120 */ 3121 function sortFragments( fragments ) { 3122 3123 fragments = toArray( fragments ); 3124 3125 var ordered = [], 3126 unordered = [], 3127 sorted = []; 3128 3129 // Group ordered and unordered elements
3130 fragments.forEach( function( fragment, i ) { 3131 if( fragment.hasAttribute( 'data-fragment-index' ) ) { 3132 var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 ); 3133 3134 if( !ordered[index] ) { 3135 ordered[index] = []; 3136 } 3137 3138 ordered[index].push( fragment ); 3139 } 3140 else { 3141 unordered.push( [ fragment ] ); 3142 } 3143 } ); 3144 3145 // Append fragments without explicit indices in their 3146 // DOM order 3147 ordered = ordered.concat( unordered ); 3148 3149 // Manually count the index up per group to ensure there 3150 // are no gaps 3151 var index = 0; 3152 3153 // Push all fragments in their sorted order to an array, 3154 // this flattens the groups 3155 ordered.forEach( function( group ) { 3156 group.forEach( function( fragment ) { 3157 sorted.push( fragment ); 3158 fragment.setAttribute( 'data-fragment-index', index ); 3159 } ); 3160 3161 index ++; 3162 } ); 3163 3164 return sorted; 3165 3166 } 3167 3168 /** 3169 * Navigate to the specified slide fragment. 3170 * 3171 * @param {Number} index The index of the fragment that 3172 * should be shown, -1 means all are invisible 3173 * @param {Number} offset Integer offset to apply to the 3174 * fragment index 3175 * 3176 * @return {Boolean} true if a change was made in any 3177 * fragments visibility as part of this call 3178 */ 3179 function navigateFragment( index, offset ) { 3180 3181 if( currentSlide && config.fragments ) { 3182 3183 var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) ); 3184 if( fragments.length ) { 3185 3186 // If no index is specified, find the current 3187 if( typeof index !== 'number' ) { 3188 var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop(); 3189 3190 if( lastVisibleFragment ) { 3191 index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 ); 3192 } 3193 else { 3194 index = -1; 3195 } 3196 } 3197 3198 // If an offset is specified, apply it to the index 3199 if( typeof offset === 'number' ) { 3200 index += offset; 3201 } 3202 3203 var fragmentsShown = [], 3204 fragmentsHidden = []; 3205 3206 toArray( fragments ).forEach( function( element, i ) { 3207 3208 if( element.hasAttribute( 'data-fragment-index' ) ) { 3209 i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 ); 3210 } 3211 3212 // Visible fragments 3213 if( i <= index ) { 3214 if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element ); 3215 element.classList.add( 'visible' ); 3216 element.classList.remove( 'current-fragment' ); 3217 3218 // Announce the fragments one by one to the Screen Reader 3219 dom.statusDiv.textContent = element.textContent; 3220 3221 if( i === index ) { 3222 element.classList.add( 'current-fragment' ); 3223 } 3224 } 3225 // Hidden fragments 3226 else { 3227 if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element ); 3228 element.classList.remove( 'visible' ); 3229 element.classList.remove( 'current-fragment' ); 3230 } 3231 3232 3233 } ); 3234 3235 if( fragmentsHidden.length ) { 3236 dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } ); 3237 } 3238 3239 if( fragmentsShown.length ) { 3240 dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } ); 3241 } 3242 3243 updateControls(); 3244 updateProgress(); 3245 3246 return !!( fragmentsShown.length || fragmentsHidden.length ); 3247 3248 } 3249 3250 } 3251 3252 return false; 3253 3254 } 3255 3256 /** 3257 * Navigate to the next slide fragment. 3258 * 3259 * @return {Boolean} true if there was a next fragment, 3260 * false otherwise 3261 */ 3262 function nextFragment() { 3263 3264 return navigateFragment( null, 1 ); 3265 3266 } 3267 3268 /** 3269 * Navigate to the previous slide fragment. 3270 * 3271 * @return {Boolean} true if there was a previous fragment, 3272 * false otherwise 3273 */ 3274 function previousFragment() { 3275 3276 return navigateFragment( null, -1 ); 3277 3278 } 3279 3280 /** 3281 * Cues a new automated slide if enabled in the config. 3282 */ 3283 function cueAutoSlide() { 3284 3285 cancelAutoSlide(); 3286 3287 if( currentSlide ) { 3288 3289 var currentFragment = currentSlide.querySelector( '.current-fragment' ); 3290 3291 var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null; 3292 var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null; 3293 var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' ); 3294 3295 // Pick value in the following priority order: 3296 // 1. Current fragment's data-autoslide 3297 // 2. Current slide's data-autoslide 3298 // 3. Parent slide's data-autoslide 3299 // 4. Global autoSlide setting 3300 if( fragmentAutoSlide ) { 3301 autoSlide = parseInt( fragmentAutoSlide, 10 ); 3302 } 3303 else if( slideAutoSlide ) { 3304 autoSlide = parseInt( slideAutoSlide, 10 ); 3305 } 3306 else if( parentAutoSlide ) { 3307 autoSlide = parseInt( parentAutoSlide, 10 ); 3308 } 3309 else { 3310 autoSlide = config.autoSlide;
3311 } 3312 3313 // If there are media elements with data-autoplay, 3314 // automatically set the autoSlide duration to the 3315 // length of that media 3316 toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { 3317 if( el.hasAttribute( 'data-autoplay' ) ) { 3318 if( autoSlide && el.duration * 1000 > autoSlide ) { 3319 autoSlide = ( el.duration * 1000 ) + 1000; 3320 } 3321 } 3322 } ); 3323 3324 // Cue the next auto-slide if: 3325 // - There is an autoSlide value 3326 // - Auto-sliding isn't paused by the user 3327 // - The presentation isn't paused 3328 // - The overview isn't active 3329 // - The presentation isn't over 3330 if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) { 3331 autoSlideTimeout = setTimeout( navigateNext, autoSlide ); 3332 autoSlideStartTime = Date.now(); 3333 } 3334 3335 if( autoSlidePlayer ) { 3336 autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 ); 3337 } 3338 3339 } 3340 3341 } 3342 3343 /** 3344 * Cancels any ongoing request to auto-slide. 3345 */ 3346 function cancelAutoSlide() { 3347 3348 clearTimeout( autoSlideTimeout ); 3349 autoSlideTimeout = -1; 3350 3351 } 3352 3353 function pauseAutoSlide() { 3354 3355 if( autoSlide && !autoSlidePaused ) { 3356 autoSlidePaused = true; 3357 dispatchEvent( 'autoslidepaused' ); 3358 clearTimeout( autoSlideTimeout ); 3359 3360 if( autoSlidePlayer ) { 3361 autoSlidePlayer.setPlaying( false ); 3362 } 3363 } 3364 3365 } 3366 3367 function resumeAutoSlide() { 3368 3369 if( autoSlide && autoSlidePaused ) { 3370 autoSlidePaused = false; 3371 dispatchEvent( 'autoslideresumed' ); 3372 cueAutoSlide(); 3373 } 3374 3375 } 3376 3377 function navigateLeft() { 3378 3379 // Reverse for RTL 3380 if( config.rtl ) { 3381 if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) { 3382 slide( indexh + 1 ); 3383 } 3384 } 3385 // Normal navigation 3386 else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) { 3387 slide( indexh - 1 ); 3388 } 3389 3390 } 3391 3392 function navigateRight() { 3393 3394 // Reverse for RTL 3395 if( config.rtl ) { 3396 if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) { 3397 slide( indexh - 1 ); 3398 } 3399 } 3400 // Normal navigation 3401 else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) { 3402 slide( indexh + 1 ); 3403 } 3404 3405 } 3406 3407 function navigateUp() { 3408 3409 // Prioritize hiding fragments 3410 if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) { 3411 slide( indexh, indexv - 1 ); 3412 } 3413 3414 } 3415 3416 function navigateDown() { 3417 3418 // Prioritize revealing fragments 3419 if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) { 3420 slide( indexh, indexv + 1 ); 3421 } 3422 3423 } 3424 3425 /** 3426 * Navigates backwards, prioritized in the following order: 3427 * 1) Previous fragment 3428 * 2) Previous vertical slide 3429 * 3) Previous horizontal slide 3430 */ 3431 function navigatePrev() { 3432 3433 // Prioritize revealing fragments 3434 if( previousFragment() === false ) { 3435 if( availableRoutes().up ) { 3436 navigateUp(); 3437 } 3438 else { 3439 // Fetch the previous horizontal slide, if there is one 3440 var previousSlide; 3441 3442 if( config.rtl ) { 3443 previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop(); 3444 } 3445 else { 3446 previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop(); 3447 } 3448 3449 if( previousSlide ) { 3450 var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined; 3451 var h = indexh - 1; 3452 slide( h, v ); 3453 } 3454 } 3455 } 3456 3457 } 3458 3459 /** 3460 * The reverse of #navigatePrev(). 3461 */ 3462 function navigateNext() { 3463 3464 // Prioritize revealing fragments 3465 if( nextFragment() === false ) { 3466 if( availableRoutes().down ) { 3467 navigateDown(); 3468 } 3469 else if( config.rtl ) { 3470 navigateLeft(); 3471 } 3472 else { 3473 navigateRight(); 3474 } 3475 } 3476 3477 // If auto-sliding is enabled we need to cue up 3478 // another timeout 3479 cueAutoSlide(); 3480 3481 } 3482 3483 3484 // --------------------------------------------------------------------// 3485 // ----------------------------- EVENTS -------------------------------// 3486 // --------------------------------------------------------------------// 3487 3488 /** 3489 * Called by all event handlers that are based on user 3490 * input. 3491 */ 3492 function onUserInput( event ) { 3493 3494 if( config.autoSlideStoppable ) { 3495 pauseAutoSlide(); 3496 } 3497 3498 } 3499
3500 /** 3501 * Handler for the document level 'keypress' event. 3502 */ 3503 function onDocumentKeyPress( event ) { 3504 3505 // Check if the pressed key is question mark 3506 if( event.shiftKey && event.charCode === 63 ) { 3507 if( dom.overlay ) { 3508 closeOverlay(); 3509 } 3510 else { 3511 showHelp( true ); 3512 } 3513 } 3514 3515 } 3516 3517 /** 3518 * Handler for the document level 'keydown' event. 3519 */ 3520 function onDocumentKeyDown( event ) { 3521 3522 // If there's a condition specified and it returns false, 3523 // ignore this event 3524 if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) { 3525 return true; 3526 } 3527 3528 // Remember if auto-sliding was paused so we can toggle it 3529 var autoSlideWasPaused = autoSlidePaused; 3530 3531 onUserInput( event ); 3532 3533 // Check if there's a focused element that could be using 3534 // the keyboard 3535 var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit'; 3536 var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName ); 3537 3538 // Disregard the event if there's a focused element or a 3539 // keyboard modifier key is present 3540 if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return; 3541 3542 // While paused only allow "unpausing" keyboard events (b and .) 3543 if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) { 3544 return false; 3545 } 3546 3547 var triggered = false; 3548 3549 // 1. User defined key bindings 3550 if( typeof config.keyboard === 'object' ) { 3551 3552 for( var key in config.keyboard ) { 3553 3554 // Check if this binding matches the pressed key 3555 if( parseInt( key, 10 ) === event.keyCode ) { 3556 3557 var value = config.keyboard[ key ]; 3558 3559 // Callback function 3560 if( typeof value === 'function' ) { 3561 value.apply( null, [ event ] ); 3562 } 3563 // String shortcuts to reveal.js API 3564 else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) { 3565 Reveal[ value ].call(); 3566 } 3567 3568 triggered = true; 3569 3570 } 3571 3572 } 3573 3574 } 3575 3576 // 2. System defined key bindings 3577 if( triggered === false ) { 3578 3579 // Assume true and try to prove false 3580 triggered = true; 3581 3582 switch( event.keyCode ) { 3583 // p, page up 3584 case 80: case 33: navigatePrev(); break; 3585 // n, page down 3586 case 78: case 34: navigateNext(); break; 3587 // h, left 3588 case 72: case 37: navigateLeft(); break; 3589 // l, right 3590 case 76: case 39: navigateRight(); break; 3591 // k, up 3592 case 75: case 38: navigateUp(); break; 3593 // j, down 3594 case 74: case 40: navigateDown(); break; 3595 // home 3596 case 36: slide( 0 ); break; 3597 // end 3598 case 35: slide( Number.MAX_VALUE ); break; 3599 // space 3600 case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break; 3601 // return 3602 case 13: isOverview() ? deactivateOverview() : triggered = false; break; 3603 // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button 3604 case 58: case 59: case 66: case 190: case 191: togglePause(); break; 3605 // f 3606 case 70: enterFullscreen(); break; 3607 // a 3608 case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break; 3609 default: 3610 triggered = false; 3611 } 3612 3613 } 3614 3615 // If the input resulted in a triggered action we should prevent 3616 // the browsers default behavior 3617 if( triggered ) { 3618 event.preventDefault && event.preventDefault(); 3619 } 3620 // ESC or O key 3621 else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) { 3622 if( dom.overlay ) { 3623 closeOverlay(); 3624 } 3625 else { 3626 toggleOverview(); 3627 } 3628 3629 event.preventDefault && event.preventDefault(); 3630 } 3631 3632 // If auto-sliding is enabled we need to cue up 3633 // another timeout 3634 cueAutoSlide(); 3635 3636 } 3637 3638 /** 3639 * Handler for the 'touchstart' event, enables support for 3640 * swipe and pinch gestures. 3641 */ 3642 function onTouchStart( event ) { 3643 3644 touch.startX = event.touches[0].clientX; 3645 touch.startY = event.touches[0].clientY; 3646 touch.startCount = event.touches.length; 3647 3648 // If there's two touches we need to memorize the distance 3649 // between those two points to detect pinching 3650 if( event.touches.length === 2 && config.overview ) { 3651 touch.startSpan = distanceBetween( { 3652 x: event.touches[1].clientX, 3653 y: event.touches[1].clientY 3654 }, { 3655 x: touch.startX, 3656 y: touch.startY 3657 } ); 3658 } 3659 3660 } 3661
3662 /** 3663 * Handler for the 'touchmove' event. 3664 */ 3665 function onTouchMove( event ) { 3666 3667 // Each touch should only trigger one action 3668 if( !touch.captured ) { 3669 onUserInput( event ); 3670 3671 var currentX = event.touches[0].clientX; 3672 var currentY = event.touches[0].clientY; 3673 3674 // If the touch started with two points and still has 3675 // two active touches; test for the pinch gesture 3676 if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) { 3677 3678 // The current distance in pixels between the two touch points 3679 var currentSpan = distanceBetween( { 3680 x: event.touches[1].clientX, 3681 y: event.touches[1].clientY 3682 }, { 3683 x: touch.startX, 3684 y: touch.startY 3685 } ); 3686 3687 // If the span is larger than the desire amount we've got 3688 // ourselves a pinch 3689 if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) { 3690 touch.captured = true; 3691 3692 if( currentSpan < touch.startSpan ) { 3693 activateOverview(); 3694 } 3695 else { 3696 deactivateOverview(); 3697 } 3698 } 3699 3700 event.preventDefault(); 3701 3702 } 3703 // There was only one touch point, look for a swipe 3704 else if( event.touches.length === 1 && touch.startCount !== 2 ) { 3705 3706 var deltaX = currentX - touch.startX, 3707 deltaY = currentY - touch.startY; 3708 3709 if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { 3710 touch.captured = true; 3711 navigateLeft(); 3712 } 3713 else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { 3714 touch.captured = true; 3715 navigateRight(); 3716 } 3717 else if( deltaY > touch.threshold ) { 3718 touch.captured = true; 3719 navigateUp(); 3720 } 3721 else if( deltaY < -touch.threshold ) { 3722 touch.captured = true; 3723 navigateDown(); 3724 } 3725 3726 // If we're embedded, only block touch events if they have 3727 // triggered an action 3728 if( config.embedded ) { 3729 if( touch.captured || isVerticalSlide( currentSlide ) ) { 3730 event.preventDefault(); 3731 } 3732 } 3733 // Not embedded? Block them all to avoid needless tossing 3734 // around of the viewport in iOS 3735 else { 3736 event.preventDefault(); 3737 } 3738 3739 } 3740 } 3741 // There's a bug with swiping on some Android devices unless 3742 // the default action is always prevented 3743 else if( navigator.userAgent.match( /android/gi ) ) { 3744 event.preventDefault(); 3745 } 3746 3747 } 3748 3749 /** 3750 * Handler for the 'touchend' event. 3751 */ 3752 function onTouchEnd( event ) { 3753 3754 touch.captured = false; 3755 3756 } 3757 3758 /** 3759 * Convert pointer down to touch start. 3760 */ 3761 function onPointerDown( event ) { 3762 3763 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 3764 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 3765 onTouchStart( event ); 3766 } 3767 3768 } 3769 3770 /** 3771 * Convert pointer move to touch move. 3772 */ 3773 function onPointerMove( event ) { 3774 3775 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 3776 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 3777 onTouchMove( event ); 3778 } 3779 3780 } 3781 3782 /** 3783 * Convert pointer up to touch end. 3784 */ 3785 function onPointerUp( event ) { 3786 3787 if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { 3788 event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; 3789 onTouchEnd( event ); 3790 } 3791 3792 } 3793 3794 /** 3795 * Handles mouse wheel scrolling, throttled to avoid skipping 3796 * multiple slides. 3797 */ 3798 function onDocumentMouseScroll( event ) { 3799 3800 if( Date.now() - lastMouseWheelStep > 600 ) { 3801 3802 lastMouseWheelStep = Date.now(); 3803 3804 var delta = event.detail || -event.wheelDelta; 3805 if( delta > 0 ) { 3806 navigateNext(); 3807 } 3808 else { 3809 navigatePrev(); 3810 } 3811 3812 } 3813 3814 } 3815 3816 /** 3817 * Clicking on the progress bar results in a navigation to the 3818 * closest approximate horizontal slide using this equation: 3819 * 3820 * ( clickX / presentationWidth ) * numberOfSlides 3821 */ 3822 function onProgressClicked( event ) { 3823 3824 onUserInput( event ); 3825 3826 event.preventDefault(); 3827 3828 var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length; 3829 var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal ); 3830 3831 slide( slideIndex ); 3832 3833 } 3834
3835 /** 3836 * Event handler for navigation control buttons. 3837 */ 3838 function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); } 3839 function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); } 3840 function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); } 3841 function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); } 3842 function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); } 3843 function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); } 3844 3845 /** 3846 * Handler for the window level 'hashchange' event. 3847 */ 3848 function onWindowHashChange( event ) { 3849 3850 readURL(); 3851 3852 } 3853 3854 /** 3855 * Handler for the window level 'resize' event. 3856 */ 3857 function onWindowResize( event ) { 3858 3859 layout(); 3860 3861 } 3862 3863 /** 3864 * Handle for the window level 'visibilitychange' event. 3865 */ 3866 function onPageVisibilityChange( event ) { 3867 3868 var isHidden = document.webkitHidden || 3869 document.msHidden || 3870 document.hidden; 3871 3872 // If, after clicking a link or similar and we're coming back, 3873 // focus the document.body to ensure we can use keyboard shortcuts 3874 if( isHidden === false && document.activeElement !== document.body ) { 3875 document.activeElement.blur(); 3876 document.body.focus(); 3877 } 3878 3879 } 3880 3881 /** 3882 * Invoked when a slide is and we're in the overview. 3883 */ 3884 function onOverviewSlideClicked( event ) { 3885 3886 // TODO There's a bug here where the event listeners are not 3887 // removed after deactivating the overview. 3888 if( eventsAreBound && isOverview() ) { 3889 event.preventDefault(); 3890 3891 var element = event.target; 3892 3893 while( element && !element.nodeName.match( /section/gi ) ) { 3894 element = element.parentNode; 3895 } 3896 3897 if( element && !element.classList.contains( 'disabled' ) ) { 3898 3899 deactivateOverview(); 3900 3901 if( element.nodeName.match( /section/gi ) ) { 3902 var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ), 3903 v = parseInt( element.getAttribute( 'data-index-v' ), 10 ); 3904 3905 slide( h, v ); 3906 } 3907 3908 } 3909 } 3910 3911 } 3912 3913 /** 3914 * Handles clicks on links that are set to preview in the 3915 * iframe overlay. 3916 */ 3917 function onPreviewLinkClicked( event ) { 3918 3919 if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) { 3920 var url = event.currentTarget.getAttribute( 'href' ); 3921 if( url ) { 3922 showPreview( url ); 3923 event.preventDefault(); 3924 } 3925 } 3926 3927 } 3928 3929 /** 3930 * Handles click on the auto-sliding controls element. 3931 */ 3932 function onAutoSlidePlayerClick( event ) { 3933 3934 // Replay 3935 if( Reveal.isLastSlide() && config.loop === false ) { 3936 slide( 0, 0 ); 3937 resumeAutoSlide(); 3938 } 3939 // Resume 3940 else if( autoSlidePaused ) { 3941 resumeAutoSlide(); 3942 } 3943 // Pause 3944 else { 3945 pauseAutoSlide(); 3946 } 3947 3948 } 3949 3950 3951 // --------------------------------------------------------------------// 3952 // ------------------------ PLAYBACK COMPONENT ------------------------// 3953 // --------------------------------------------------------------------// 3954 3955 3956 /** 3957 * Constructor for the playback component, which displays 3958 * play/pause/progress controls. 3959 * 3960 * @param {HTMLElement} container The component will append 3961 * itself to this 3962 * @param {Function} progressCheck A method which will be 3963 * called frequently to get the current progress on a range 3964 * of 0-1 3965 */ 3966 function Playback( container, progressCheck ) { 3967 3968 // Cosmetics 3969 this.diameter = 50; 3970 this.thickness = 3; 3971 3972 // Flags if we are currently playing 3973 this.playing = false; 3974 3975 // Current progress on a 0-1 range 3976 this.progress = 0; 3977 3978 // Used to loop the animation smoothly 3979 this.progressOffset = 1; 3980 3981 this.container = container; 3982 this.progressCheck = progressCheck; 3983 3984 this.canvas = document.createElement( 'canvas' ); 3985 this.canvas.className = 'playback'; 3986 this.canvas.width = this.diameter; 3987 this.canvas.height = this.diameter; 3988 this.context = this.canvas.getContext( '2d' ); 3989 3990 this.container.appendChild( this.canvas ); 3991 3992 this.render(); 3993 3994 } 3995 3996 Playback.prototype.setPlaying = function( value ) { 3997 3998 var wasPlaying = this.playing; 3999 4000 this.playing = value; 4001 4002 // Start repainting if we weren't already 4003 if( !wasPlaying && this.playing ) { 4004 this.animate(); 4005 } 4006 else { 4007 this.render(); 4008 } 4009 4010 }; 4011 4012 Playback.prototype.animate = function() { 4013 4014 var progressBefore = this.progress; 4015 4016 this.progress = this.progressCheck(); 4017 4018 // When we loop, offset the progress so that it eases
4019 // smoothly rather than immediately resetting 4020 if( progressBefore > 0.8 && this.progress < 0.2 ) { 4021 this.progressOffset = this.progress; 4022 } 4023 4024 this.render(); 4025 4026 if( this.playing ) { 4027 features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) ); 4028 } 4029 4030 }; 4031 4032 /** 4033 * Renders the current progress and playback state. 4034 */ 4035 Playback.prototype.render = function() { 4036 4037 var progress = this.playing ? this.progress : 0, 4038 radius = ( this.diameter / 2 ) - this.thickness, 4039 x = this.diameter / 2, 4040 y = this.diameter / 2, 4041 iconSize = 14; 4042 4043 // Ease towards 1 4044 this.progressOffset += ( 1 - this.progressOffset ) * 0.1; 4045 4046 var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) ); 4047 var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) ); 4048 4049 this.context.save(); 4050 this.context.clearRect( 0, 0, this.diameter, this.diameter ); 4051 4052 // Solid background color 4053 this.context.beginPath(); 4054 this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false ); 4055 this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )'; 4056 this.context.fill(); 4057 4058 // Draw progress track 4059 this.context.beginPath(); 4060 this.context.arc( x, y, radius, 0, Math.PI * 2, false ); 4061 this.context.lineWidth = this.thickness; 4062 this.context.strokeStyle = '#666'; 4063 this.context.stroke(); 4064 4065 if( this.playing ) { 4066 // Draw progress on top of track 4067 this.context.beginPath(); 4068 this.context.arc( x, y, radius, startAngle, endAngle, false ); 4069 this.context.lineWidth = this.thickness; 4070 this.context.strokeStyle = '#fff'; 4071 this.context.stroke(); 4072 } 4073 4074 this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) ); 4075 4076 // Draw play/pause icons 4077 if( this.playing ) { 4078 this.context.fillStyle = '#fff'; 4079 this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize ); 4080 this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize ); 4081 } 4082 else { 4083 this.context.beginPath(); 4084 this.context.translate( 2, 0 ); 4085 this.context.moveTo( 0, 0 ); 4086 this.context.lineTo( iconSize - 2, iconSize / 2 ); 4087 this.context.lineTo( 0, iconSize ); 4088 this.context.fillStyle = '#fff'; 4089 this.context.fill(); 4090 } 4091 4092 this.context.restore(); 4093 4094 }; 4095 4096 Playback.prototype.on = function( type, listener ) { 4097 this.canvas.addEventListener( type, listener, false ); 4098 }; 4099 4100 Playback.prototype.off = function( type, listener ) { 4101 this.canvas.removeEventListener( type, listener, false ); 4102 }; 4103 4104 Playback.prototype.destroy = function() { 4105 4106 this.playing = false; 4107 4108 if( this.canvas.parentNode ) { 4109 this.container.removeChild( this.canvas ); 4110 } 4111 4112 }; 4113 4114 4115 // --------------------------------------------------------------------// 4116 // ------------------------------- API --------------------------------// 4117 // --------------------------------------------------------------------// 4118 4119 4120 Reveal = { 4121 initialize: initialize, 4122 configure: configure, 4123 sync: sync, 4124 4125 // Navigation methods 4126 slide: slide, 4127 left: navigateLeft, 4128 right: navigateRight, 4129 up: navigateUp, 4130 down: navigateDown, 4131 prev: navigatePrev, 4132 next: navigateNext, 4133 4134 // Fragment methods 4135 navigateFragment: navigateFragment, 4136 prevFragment: previousFragment, 4137 nextFragment: nextFragment, 4138 4139 // Deprecated aliases 4140 navigateTo: slide, 4141 navigateLeft: navigateLeft, 4142 navigateRight: navigateRight, 4143 navigateUp: navigateUp, 4144 navigateDown: navigateDown, 4145 navigatePrev: navigatePrev, 4146 navigateNext: navigateNext, 4147 4148 // Forces an update in slide layout 4149 layout: layout, 4150 4151 // Returns an object with the available routes as booleans (left/right/top/bottom) 4152 availableRoutes: availableRoutes, 4153 4154 // Returns an object with the available fragments as booleans (prev/next) 4155 availableFragments: availableFragments, 4156 4157 // Toggles the overview mode on/off 4158 toggleOverview: toggleOverview, 4159 4160 // Toggles the "black screen" mode on/off 4161 togglePause: togglePause, 4162 4163 // Toggles the auto slide mode on/off 4164 toggleAutoSlide: toggleAutoSlide, 4165 4166 // State checks 4167 isOverview: isOverview, 4168 isPaused: isPaused, 4169 isAutoSliding: isAutoSliding, 4170 4171 // Adds or removes all internal event listeners (such as keyboard) 4172 addEventListeners: addEventListeners, 4173 removeEventListeners: removeEventListeners, 4174 4175 // Facility for persisting and restoring the presentation state 4176 getState: getState, 4177 setState: setState, 4178 4179 // Presentation progress on range of 0-1 4180 getProgress: getProgress, 4181 4182 // Returns the indices of the current, or specified, slide 4183 getIndices: getIndices, 4184 4185 getTotalSlides: getTotalSlides, 4186 4187 // Returns the slide element at the specified index 4188 getSlide: getSlide, 4189 4190 // Returns the slide background element at the specified index
4191 getSlideBackground: getSlideBackground, 4192 4193 // Returns the previous slide element, may be null 4194 getPreviousSlide: function() { 4195 return previousSlide; 4196 }, 4197 4198 // Returns the current slide element 4199 getCurrentSlide: function() { 4200 return currentSlide; 4201 }, 4202 4203 // Returns the current scale of the presentation content 4204 getScale: function() { 4205 return scale; 4206 }, 4207 4208 // Returns the current configuration object 4209 getConfig: function() { 4210 return config; 4211 }, 4212 4213 // Helper method, retrieves query string as a key/value hash 4214 getQueryHash: function() { 4215 var query = {}; 4216 4217 location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) { 4218 query[ a.split( '=' ).shift() ] = a.split( '=' ).pop(); 4219 } ); 4220 4221 // Basic deserialization 4222 for( var i in query ) { 4223 var value = query[ i ]; 4224 4225 query[ i ] = deserialize( unescape( value ) ); 4226 } 4227 4228 return query; 4229 }, 4230 4231 // Returns true if we're currently on the first slide 4232 isFirstSlide: function() { 4233 return ( indexh === 0 && indexv === 0 ); 4234 }, 4235 4236 // Returns true if we're currently on the last slide 4237 isLastSlide: function() { 4238 if( currentSlide ) { 4239 // Does this slide has next a sibling? 4240 if( currentSlide.nextElementSibling ) return false; 4241 4242 // If it's vertical, does its parent have a next sibling? 4243 if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false; 4244 4245 return true; 4246 } 4247 4248 return false; 4249 }, 4250 4251 // Checks if reveal.js has been loaded and is ready for use 4252 isReady: function() { 4253 return loaded; 4254 }, 4255 4256 // Forward event binding to the reveal DOM element 4257 addEventListener: function( type, listener, useCapture ) { 4258 if( 'addEventListener' in window ) { 4259 ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture ); 4260 } 4261 }, 4262 removeEventListener: function( type, listener, useCapture ) { 4263 if( 'addEventListener' in window ) { 4264 ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture ); 4265 } 4266 }, 4267 4268 // Programatically triggers a keyboard event 4269 triggerKey: function( keyCode ) { 4270 onDocumentKeyDown( { keyCode: keyCode } ); 4271 } 4272 }; 4273 4274 return Reveal; 4275 4276}));
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.