reveal.js 111 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391239223932394239523962397239823992400240124022403240424052406240724082409241024112412241324142415241624172418241924202421242224232424242524262427242824292430243124322433243424352436243724382439244024412442244324442445244624472448244924502451245224532454245524562457245824592460246124622463246424652466246724682469247024712472247324742475247624772478247924802481248224832484248524862487248824892490249124922493249424952496249724982499250025012502250325042505250625072508250925102511251225132514251525162517251825192520252125222523252425252526252725282529253025312532253325342535253625372538253925402541254225432544254525462547254825492550255125522553255425552556255725582559256025612562256325642565256625672568256925702571257225732574257525762577257825792580258125822583258425852586258725882589259025912592259325942595259625972598259926002601260226032604260526062607260826092610261126122613261426152616261726182619262026212622262326242625262626272628262926302631263226332634263526362637263826392640264126422643264426452646264726482649265026512652265326542655265626572658265926602661266226632664266526662667266826692670267126722673267426752676267726782679268026812682268326842685268626872688268926902691269226932694269526962697269826992700270127022703270427052706270727082709271027112712271327142715271627172718271927202721272227232724272527262727272827292730273127322733273427352736273727382739274027412742274327442745274627472748274927502751275227532754275527562757275827592760276127622763276427652766276727682769277027712772277327742775277627772778277927802781278227832784278527862787278827892790279127922793279427952796279727982799280028012802280328042805280628072808280928102811281228132814281528162817281828192820282128222823282428252826282728282829283028312832283328342835283628372838283928402841284228432844284528462847284828492850285128522853285428552856285728582859286028612862286328642865286628672868286928702871287228732874287528762877287828792880288128822883288428852886288728882889289028912892289328942895289628972898289929002901290229032904290529062907290829092910291129122913291429152916291729182919292029212922292329242925292629272928292929302931293229332934293529362937293829392940294129422943294429452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692970297129722973297429752976297729782979298029812982298329842985298629872988298929902991299229932994299529962997299829993000300130023003300430053006300730083009301030113012301330143015301630173018301930203021302230233024302530263027302830293030303130323033303430353036303730383039304030413042304330443045304630473048304930503051305230533054305530563057305830593060306130623063306430653066306730683069307030713072307330743075307630773078307930803081308230833084308530863087308830893090309130923093309430953096309730983099310031013102310331043105310631073108310931103111311231133114311531163117311831193120312131223123312431253126312731283129313031313132313331343135313631373138313931403141314231433144314531463147314831493150315131523153315431553156315731583159316031613162316331643165316631673168316931703171317231733174317531763177317831793180318131823183318431853186318731883189319031913192319331943195319631973198319932003201320232033204320532063207320832093210321132123213321432153216321732183219322032213222322332243225322632273228322932303231323232333234323532363237323832393240324132423243324432453246324732483249325032513252325332543255325632573258325932603261326232633264326532663267326832693270327132723273327432753276327732783279328032813282328332843285328632873288328932903291329232933294329532963297329832993300330133023303330433053306330733083309331033113312331333143315331633173318331933203321332233233324332533263327332833293330333133323333333433353336333733383339334033413342334333443345334633473348334933503351335233533354335533563357335833593360336133623363336433653366336733683369337033713372337333743375337633773378337933803381338233833384338533863387338833893390339133923393339433953396339733983399340034013402340334043405340634073408340934103411341234133414341534163417341834193420342134223423342434253426342734283429343034313432343334343435343634373438343934403441344234433444344534463447344834493450345134523453345434553456345734583459346034613462346334643465346634673468346934703471347234733474347534763477347834793480348134823483348434853486348734883489349034913492349334943495349634973498349935003501350235033504350535063507350835093510351135123513351435153516351735183519352035213522352335243525352635273528352935303531353235333534353535363537353835393540354135423543354435453546354735483549355035513552355335543555355635573558355935603561356235633564356535663567356835693570357135723573357435753576357735783579358035813582358335843585358635873588358935903591359235933594359535963597359835993600360136023603360436053606360736083609361036113612361336143615361636173618361936203621362236233624362536263627362836293630363136323633363436353636363736383639364036413642364336443645364636473648364936503651365236533654365536563657365836593660366136623663366436653666366736683669367036713672367336743675367636773678367936803681368236833684368536863687368836893690369136923693369436953696369736983699370037013702370337043705370637073708370937103711371237133714371537163717371837193720372137223723372437253726372737283729373037313732373337343735373637373738373937403741374237433744374537463747374837493750375137523753375437553756375737583759376037613762376337643765376637673768376937703771377237733774377537763777377837793780378137823783378437853786378737883789379037913792379337943795379637973798379938003801380238033804380538063807380838093810381138123813381438153816381738183819382038213822382338243825382638273828382938303831383238333834383538363837383838393840384138423843384438453846384738483849385038513852385338543855385638573858385938603861386238633864386538663867386838693870387138723873387438753876387738783879388038813882388338843885388638873888388938903891389238933894389538963897389838993900390139023903390439053906390739083909391039113912391339143915391639173918391939203921392239233924392539263927392839293930393139323933393439353936393739383939394039413942394339443945394639473948394939503951395239533954395539563957395839593960396139623963396439653966396739683969397039713972397339743975397639773978397939803981398239833984398539863987398839893990399139923993399439953996399739983999400040014002400340044005400640074008400940104011401240134014401540164017401840194020402140224023402440254026402740284029403040314032403340344035403640374038403940404041404240434044404540464047404840494050405140524053405440554056405740584059406040614062406340644065406640674068406940704071407240734074407540764077407840794080408140824083408440854086408740884089409040914092409340944095409640974098409941004101410241034104410541064107410841094110411141124113411441154116411741184119412041214122412341244125412641274128412941304131413241334134413541364137413841394140414141424143
  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2014 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. 'use strict';
  24. var Reveal;
  25. var SLIDES_SELECTOR = '.slides section',
  26. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  27. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  28. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  29. // Configurations defaults, can be overridden at initialization time
  30. config = {
  31. // The "normal" size of the presentation, aspect ratio will be preserved
  32. // when the presentation is scaled to fit different resolutions
  33. width: 960,
  34. height: 700,
  35. // Factor of the display size that should remain empty around the content
  36. margin: 0.1,
  37. // Bounds for smallest/largest possible scale to apply to content
  38. minScale: 0.2,
  39. maxScale: 1.0,
  40. // Display controls in the bottom right corner
  41. controls: true,
  42. // Display a presentation progress bar
  43. progress: true,
  44. // Display the page number of the current slide
  45. slideNumber: false,
  46. // Push each slide change to the browser history
  47. history: false,
  48. // Enable keyboard shortcuts for navigation
  49. keyboard: true,
  50. // Optional function that blocks keyboard events when retuning false
  51. keyboardCondition: null,
  52. // Enable the slide overview mode
  53. overview: true,
  54. // Vertical centering of slides
  55. center: true,
  56. // Enables touch navigation on devices with touch input
  57. touch: true,
  58. // Loop the presentation
  59. loop: false,
  60. // Change the presentation direction to be RTL
  61. rtl: false,
  62. // Turns fragments on and off globally
  63. fragments: true,
  64. // Flags if the presentation is running in an embedded mode,
  65. // i.e. contained within a limited portion of the screen
  66. embedded: false,
  67. // Flags if we should show a help overlay when the questionmark
  68. // key is pressed
  69. help: true,
  70. // Flags if it should be possible to pause the presentation (blackout)
  71. pause: true,
  72. // Number of milliseconds between automatically proceeding to the
  73. // next slide, disabled when set to 0, this value can be overwritten
  74. // by using a data-autoslide attribute on your slides
  75. autoSlide: 0,
  76. // Stop auto-sliding after user input
  77. autoSlideStoppable: true,
  78. // Enable slide navigation via mouse wheel
  79. mouseWheel: false,
  80. // Apply a 3D roll to links on hover
  81. rollingLinks: false,
  82. // Hides the address bar on mobile devices
  83. hideAddressBar: true,
  84. // Opens links in an iframe preview overlay
  85. previewLinks: false,
  86. // Exposes the reveal.js API through window.postMessage
  87. postMessage: true,
  88. // Dispatches all reveal.js events to the parent window through postMessage
  89. postMessageEvents: false,
  90. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  91. focusBodyOnPageVisibilityChange: true,
  92. // Theme (see /css/theme)
  93. theme: null,
  94. // Transition style
  95. transition: 'default', // none/fade/slide/convex/concave/zoom
  96. // Transition speed
  97. transitionSpeed: 'default', // default/fast/slow
  98. // Transition style for full page slide backgrounds
  99. backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
  100. // Parallax background image
  101. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  102. // Parallax background size
  103. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  104. // Number of slides away from the current that are visible
  105. viewDistance: 3,
  106. // Script dependencies to load
  107. dependencies: []
  108. },
  109. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  110. loaded = false,
  111. // The horizontal and vertical index of the currently active slide
  112. indexh,
  113. indexv,
  114. // The previous and current slide HTML elements
  115. previousSlide,
  116. currentSlide,
  117. previousBackground,
  118. // Slides may hold a data-state attribute which we pick up and apply
  119. // as a class to the body. This list contains the combined state of
  120. // all current slides.
  121. state = [],
  122. // The current scale of the presentation (see width/height config)
  123. scale = 1,
  124. // Cached references to DOM elements
  125. dom = {},
  126. // Features supported by the browser, see #checkCapabilities()
  127. features = {},
  128. // Client is a mobile device, see #checkCapabilities()
  129. isMobileDevice,
  130. // Throttles mouse wheel navigation
  131. lastMouseWheelStep = 0,
  132. // Delays updates to the URL due to a Chrome thumbnailer bug
  133. writeURLTimeout = 0,
  134. // Flags if the interaction event listeners are bound
  135. eventsAreBound = false,
  136. // The current auto-slide duration
  137. autoSlide = 0,
  138. // Auto slide properties
  139. autoSlidePlayer,
  140. autoSlideTimeout = 0,
  141. autoSlideStartTime = -1,
  142. autoSlidePaused = false,
  143. // Holds information about the currently ongoing touch input
  144. touch = {
  145. startX: 0,
  146. startY: 0,
  147. startSpan: 0,
  148. startCount: 0,
  149. captured: false,
  150. threshold: 40
  151. },
  152. // Holds information about the keyboard shortcuts
  153. keyboardShortcuts = {
  154. 'N , SPACE': 'Next slide',
  155. 'P': 'Previous slide',
  156. '← , H': 'Navigate left',
  157. '→ , L': 'Navigate right',
  158. '↑ , K': 'Navigate up',
  159. '↓ , J': 'Navigate down',
  160. 'Home': 'First slide',
  161. 'End': 'Last slide',
  162. 'B , .': 'Pause',
  163. 'F': 'Fullscreen',
  164. 'ESC, O': 'Slide overview'
  165. };
  166. /**
  167. * Starts up the presentation if the client is capable.
  168. */
  169. function initialize( options ) {
  170. checkCapabilities();
  171. if( !features.transforms2d && !features.transforms3d ) {
  172. document.body.setAttribute( 'class', 'no-transforms' );
  173. // Since JS won't be running any further, we need to load all
  174. // images that were intended to lazy load now
  175. var images = document.getElementsByTagName( 'img' );
  176. for( var i = 0, len = images.length; i < len; i++ ) {
  177. var image = images[i];
  178. if( image.getAttribute( 'data-src' ) ) {
  179. image.setAttribute( 'src', image.getAttribute( 'data-src' ) );
  180. image.removeAttribute( 'data-src' );
  181. }
  182. }
  183. // If the browser doesn't support core features we won't be
  184. // using JavaScript to control the presentation
  185. return;
  186. }
  187. // Cache references to key DOM elements
  188. dom.wrapper = document.querySelector( '.reveal' );
  189. dom.slides = document.querySelector( '.reveal .slides' );
  190. // Force a layout when the whole page, incl fonts, has loaded
  191. window.addEventListener( 'load', layout, false );
  192. var query = Reveal.getQueryHash();
  193. // Do not accept new dependencies via query config to avoid
  194. // the potential of malicious script injection
  195. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  196. // Copy options over to our config object
  197. extend( config, options );
  198. extend( config, query );
  199. // Hide the address bar in mobile browsers
  200. hideAddressBar();
  201. // Loads the dependencies and continues to #start() once done
  202. load();
  203. }
  204. /**
  205. * Inspect the client to see what it's capable of, this
  206. * should only happens once per runtime.
  207. */
  208. function checkCapabilities() {
  209. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  210. 'MozPerspective' in document.body.style ||
  211. 'msPerspective' in document.body.style ||
  212. 'OPerspective' in document.body.style ||
  213. 'perspective' in document.body.style;
  214. features.transforms2d = 'WebkitTransform' in document.body.style ||
  215. 'MozTransform' in document.body.style ||
  216. 'msTransform' in document.body.style ||
  217. 'OTransform' in document.body.style ||
  218. 'transform' in document.body.style;
  219. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  220. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  221. features.canvas = !!document.createElement( 'canvas' ).getContext;
  222. features.touch = !!( 'ontouchstart' in window );
  223. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi );
  224. }
  225. /**
  226. * Loads the dependencies of reveal.js. Dependencies are
  227. * defined via the configuration option 'dependencies'
  228. * and will be loaded prior to starting/binding reveal.js.
  229. * Some dependencies may have an 'async' flag, if so they
  230. * will load after reveal.js has been started up.
  231. */
  232. function load() {
  233. var scripts = [],
  234. scriptsAsync = [],
  235. scriptsToPreload = 0;
  236. // Called once synchronous scripts finish loading
  237. function proceed() {
  238. if( scriptsAsync.length ) {
  239. // Load asynchronous scripts
  240. head.js.apply( null, scriptsAsync );
  241. }
  242. start();
  243. }
  244. function loadScript( s ) {
  245. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  246. // Extension may contain callback functions
  247. if( typeof s.callback === 'function' ) {
  248. s.callback.apply( this );
  249. }
  250. if( --scriptsToPreload === 0 ) {
  251. proceed();
  252. }
  253. });
  254. }
  255. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  256. var s = config.dependencies[i];
  257. // Load if there's no condition or the condition is truthy
  258. if( !s.condition || s.condition() ) {
  259. if( s.async ) {
  260. scriptsAsync.push( s.src );
  261. }
  262. else {
  263. scripts.push( s.src );
  264. }
  265. loadScript( s );
  266. }
  267. }
  268. if( scripts.length ) {
  269. scriptsToPreload = scripts.length;
  270. // Load synchronous scripts
  271. head.js.apply( null, scripts );
  272. }
  273. else {
  274. proceed();
  275. }
  276. }
  277. /**
  278. * Starts up reveal.js by binding input events and navigating
  279. * to the current URL deeplink if there is one.
  280. */
  281. function start() {
  282. // Make sure we've got all the DOM elements we need
  283. setupDOM();
  284. // Listen to messages posted to this window
  285. setupPostMessage();
  286. // Resets all vertical slides so that only the first is visible
  287. resetVerticalSlides();
  288. // Updates the presentation to match the current configuration values
  289. configure();
  290. // Read the initial hash
  291. readURL();
  292. // Update all backgrounds
  293. updateBackground( true );
  294. // Notify listeners that the presentation is ready but use a 1ms
  295. // timeout to ensure it's not fired synchronously after #initialize()
  296. setTimeout( function() {
  297. // Enable transitions now that we're loaded
  298. dom.slides.classList.remove( 'no-transition' );
  299. loaded = true;
  300. dispatchEvent( 'ready', {
  301. 'indexh': indexh,
  302. 'indexv': indexv,
  303. 'currentSlide': currentSlide
  304. } );
  305. }, 1 );
  306. // Special setup and config is required when printing to PDF
  307. if( isPrintingPDF() ) {
  308. removeEventListeners();
  309. // The document needs to have loaded for the PDF layout
  310. // measurements to be accurate
  311. if( document.readyState === 'complete' ) {
  312. setupPDF();
  313. }
  314. else {
  315. window.addEventListener( 'load', setupPDF );
  316. }
  317. }
  318. }
  319. /**
  320. * Finds and stores references to DOM elements which are
  321. * required by the presentation. If a required element is
  322. * not found, it is created.
  323. */
  324. function setupDOM() {
  325. // Prevent transitions while we're loading
  326. dom.slides.classList.add( 'no-transition' );
  327. // Background element
  328. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  329. // Progress bar
  330. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  331. dom.progressbar = dom.progress.querySelector( 'span' );
  332. // Arrow controls
  333. createSingletonNode( dom.wrapper, 'aside', 'controls',
  334. '<div class="navigate-left"></div>' +
  335. '<div class="navigate-right"></div>' +
  336. '<div class="navigate-up"></div>' +
  337. '<div class="navigate-down"></div>' );
  338. // Slide number
  339. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  340. // State background element [DEPRECATED]
  341. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  342. // Overlay graphic which is displayed during the paused mode
  343. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  344. // Cache references to elements
  345. dom.controls = document.querySelector( '.reveal .controls' );
  346. dom.theme = document.querySelector( '#theme' );
  347. dom.wrapper.setAttribute( 'role', 'application' );
  348. // There can be multiple instances of controls throughout the page
  349. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  350. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  351. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  352. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  353. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  354. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  355. dom.statusDiv = createStatusDiv();
  356. }
  357. /**
  358. * Creates a hidden div with role aria-live to announce the
  359. * current slide content. Hide the div off-screen to make it
  360. * available only to Assistive Technologies.
  361. */
  362. function createStatusDiv() {
  363. var statusDiv = document.getElementById( 'aria-status-div' );
  364. if( !statusDiv ) {
  365. statusDiv = document.createElement( 'div' );
  366. statusDiv.style.position = 'absolute';
  367. statusDiv.style.height = '1px';
  368. statusDiv.style.width = '1px';
  369. statusDiv.style.overflow ='hidden';
  370. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  371. statusDiv.setAttribute( 'id', 'aria-status-div' );
  372. statusDiv.setAttribute( 'aria-live', 'polite' );
  373. statusDiv.setAttribute( 'aria-atomic','true' );
  374. dom.wrapper.appendChild( statusDiv );
  375. }
  376. return statusDiv;
  377. }
  378. /**
  379. * Configures the presentation for printing to a static
  380. * PDF.
  381. */
  382. function setupPDF() {
  383. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  384. // Dimensions of the PDF pages
  385. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  386. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  387. // Dimensions of slides within the pages
  388. var slideWidth = slideSize.width,
  389. slideHeight = slideSize.height;
  390. // Let the browser know what page size we want to print
  391. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  392. // Limit the size of certain elements to the dimensions of the slide
  393. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  394. document.body.classList.add( 'print-pdf' );
  395. document.body.style.width = pageWidth + 'px';
  396. document.body.style.height = pageHeight + 'px';
  397. // Slide and slide background layout
  398. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  399. // Vertical stacks are not centred since their section
  400. // children will be
  401. if( slide.classList.contains( 'stack' ) === false ) {
  402. // Center the slide inside of the page, giving the slide some margin
  403. var left = ( pageWidth - slideWidth ) / 2,
  404. top = ( pageHeight - slideHeight ) / 2;
  405. var contentHeight = getAbsoluteHeight( slide );
  406. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  407. // Center slides vertically
  408. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  409. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  410. }
  411. // Position the slide inside of the page
  412. slide.style.left = left + 'px';
  413. slide.style.top = top + 'px';
  414. slide.style.width = slideWidth + 'px';
  415. // TODO Backgrounds need to be multiplied when the slide
  416. // stretches over multiple pages
  417. var background = slide.querySelector( '.slide-background' );
  418. if( background ) {
  419. background.style.width = pageWidth + 'px';
  420. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  421. background.style.top = -top + 'px';
  422. background.style.left = -left + 'px';
  423. }
  424. }
  425. } );
  426. // Show all fragments
  427. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  428. fragment.classList.add( 'visible' );
  429. } );
  430. }
  431. /**
  432. * Creates an HTML element and returns a reference to it.
  433. * If the element already exists the existing instance will
  434. * be returned.
  435. */
  436. function createSingletonNode( container, tagname, classname, innerHTML ) {
  437. // Find all nodes matching the description
  438. var nodes = container.querySelectorAll( '.' + classname );
  439. // Check all matches to find one which is a direct child of
  440. // the specified container
  441. for( var i = 0; i < nodes.length; i++ ) {
  442. var testNode = nodes[i];
  443. if( testNode.parentNode === container ) {
  444. return testNode;
  445. }
  446. }
  447. // If no node was found, create it now
  448. var node = document.createElement( tagname );
  449. node.classList.add( classname );
  450. if( typeof innerHTML === 'string' ) {
  451. node.innerHTML = innerHTML;
  452. }
  453. container.appendChild( node );
  454. return node;
  455. }
  456. /**
  457. * Creates the slide background elements and appends them
  458. * to the background container. One element is created per
  459. * slide no matter if the given slide has visible background.
  460. */
  461. function createBackgrounds() {
  462. var printMode = isPrintingPDF();
  463. // Clear prior backgrounds
  464. dom.background.innerHTML = '';
  465. dom.background.classList.add( 'no-transition' );
  466. // Iterate over all horizontal slides
  467. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  468. var backgroundStack;
  469. if( printMode ) {
  470. backgroundStack = createBackground( slideh, slideh );
  471. }
  472. else {
  473. backgroundStack = createBackground( slideh, dom.background );
  474. }
  475. // Iterate over all vertical slides
  476. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  477. if( printMode ) {
  478. createBackground( slidev, slidev );
  479. }
  480. else {
  481. createBackground( slidev, backgroundStack );
  482. }
  483. backgroundStack.classList.add( 'stack' );
  484. } );
  485. } );
  486. // Add parallax background if specified
  487. if( config.parallaxBackgroundImage ) {
  488. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  489. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  490. // Make sure the below properties are set on the element - these properties are
  491. // needed for proper transitions to be set on the element via CSS. To remove
  492. // annoying background slide-in effect when the presentation starts, apply
  493. // these properties after short time delay
  494. setTimeout( function() {
  495. dom.wrapper.classList.add( 'has-parallax-background' );
  496. }, 1 );
  497. }
  498. else {
  499. dom.background.style.backgroundImage = '';
  500. dom.wrapper.classList.remove( 'has-parallax-background' );
  501. }
  502. }
  503. /**
  504. * Creates a background for the given slide.
  505. *
  506. * @param {HTMLElement} slide
  507. * @param {HTMLElement} container The element that the background
  508. * should be appended to
  509. */
  510. function createBackground( slide, container ) {
  511. var data = {
  512. background: slide.getAttribute( 'data-background' ),
  513. backgroundSize: slide.getAttribute( 'data-background-size' ),
  514. backgroundImage: slide.getAttribute( 'data-background-image' ),
  515. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  516. backgroundColor: slide.getAttribute( 'data-background-color' ),
  517. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  518. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  519. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  520. };
  521. var element = document.createElement( 'div' );
  522. // Carry over custom classes from the slide to the background
  523. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  524. if( data.background ) {
  525. // Auto-wrap image urls in url(...)
  526. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  527. slide.setAttribute( 'data-background-image', data.background );
  528. }
  529. else {
  530. element.style.background = data.background;
  531. }
  532. }
  533. // Create a hash for this combination of background settings.
  534. // This is used to determine when two slide backgrounds are
  535. // the same.
  536. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  537. element.setAttribute( 'data-background-hash', data.background +
  538. data.backgroundSize +
  539. data.backgroundImage +
  540. data.backgroundVideo +
  541. data.backgroundColor +
  542. data.backgroundRepeat +
  543. data.backgroundPosition +
  544. data.backgroundTransition );
  545. }
  546. // Additional and optional background properties
  547. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  548. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  549. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  550. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  551. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  552. container.appendChild( element );
  553. return element;
  554. }
  555. /**
  556. * Registers a listener to postMessage events, this makes it
  557. * possible to call all reveal.js API methods from another
  558. * window. For example:
  559. *
  560. * revealWindow.postMessage( JSON.stringify({
  561. * method: 'slide',
  562. * args: [ 2 ]
  563. * }), '*' );
  564. */
  565. function setupPostMessage() {
  566. if( config.postMessage ) {
  567. window.addEventListener( 'message', function ( event ) {
  568. var data = event.data;
  569. // Make sure we're dealing with JSON
  570. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  571. data = JSON.parse( data );
  572. // Check if the requested method can be found
  573. if( data.method && typeof Reveal[data.method] === 'function' ) {
  574. Reveal[data.method].apply( Reveal, data.args );
  575. }
  576. }
  577. }, false );
  578. }
  579. }
  580. /**
  581. * Applies the configuration settings from the config
  582. * object. May be called multiple times.
  583. */
  584. function configure( options ) {
  585. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  586. dom.wrapper.classList.remove( config.transition );
  587. // New config options may be passed when this method
  588. // is invoked through the API after initialization
  589. if( typeof options === 'object' ) extend( config, options );
  590. // Force linear transition based on browser capabilities
  591. if( features.transforms3d === false ) config.transition = 'linear';
  592. dom.wrapper.classList.add( config.transition );
  593. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  594. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  595. dom.controls.style.display = config.controls ? 'block' : 'none';
  596. dom.progress.style.display = config.progress ? 'block' : 'none';
  597. if( config.rtl ) {
  598. dom.wrapper.classList.add( 'rtl' );
  599. }
  600. else {
  601. dom.wrapper.classList.remove( 'rtl' );
  602. }
  603. if( config.center ) {
  604. dom.wrapper.classList.add( 'center' );
  605. }
  606. else {
  607. dom.wrapper.classList.remove( 'center' );
  608. }
  609. // Exit the paused mode if it was configured off
  610. if( config.pause === false ) {
  611. resume();
  612. }
  613. if( config.mouseWheel ) {
  614. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  615. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  616. }
  617. else {
  618. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  619. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  620. }
  621. // Rolling 3D links
  622. if( config.rollingLinks ) {
  623. enableRollingLinks();
  624. }
  625. else {
  626. disableRollingLinks();
  627. }
  628. // Iframe link previews
  629. if( config.previewLinks ) {
  630. enablePreviewLinks();
  631. }
  632. else {
  633. disablePreviewLinks();
  634. enablePreviewLinks( '[data-preview-link]' );
  635. }
  636. // Remove existing auto-slide controls
  637. if( autoSlidePlayer ) {
  638. autoSlidePlayer.destroy();
  639. autoSlidePlayer = null;
  640. }
  641. // Generate auto-slide controls if needed
  642. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  643. autoSlidePlayer = new Playback( dom.wrapper, function() {
  644. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  645. } );
  646. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  647. autoSlidePaused = false;
  648. }
  649. // When fragments are turned off they should be visible
  650. if( config.fragments === false ) {
  651. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  652. element.classList.add( 'visible' );
  653. element.classList.remove( 'current-fragment' );
  654. } );
  655. }
  656. // Load the theme in the config, if it's not already loaded
  657. if( config.theme && dom.theme ) {
  658. var themeURL = dom.theme.getAttribute( 'href' );
  659. var themeFinder = /[^\/]*?(?=\.css)/;
  660. var themeName = themeURL.match(themeFinder)[0];
  661. if( config.theme !== themeName ) {
  662. themeURL = themeURL.replace(themeFinder, config.theme);
  663. dom.theme.setAttribute( 'href', themeURL );
  664. }
  665. }
  666. sync();
  667. }
  668. /**
  669. * Binds all event listeners.
  670. */
  671. function addEventListeners() {
  672. eventsAreBound = true;
  673. window.addEventListener( 'hashchange', onWindowHashChange, false );
  674. window.addEventListener( 'resize', onWindowResize, false );
  675. if( config.touch ) {
  676. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  677. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  678. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  679. // Support pointer-style touch interaction as well
  680. if( window.navigator.pointerEnabled ) {
  681. // IE 11 uses un-prefixed version of pointer events
  682. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  683. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  684. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  685. }
  686. else if( window.navigator.msPointerEnabled ) {
  687. // IE 10 uses prefixed version of pointer events
  688. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  689. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  690. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  691. }
  692. }
  693. if( config.keyboard ) {
  694. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  695. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  696. }
  697. if( config.progress && dom.progress ) {
  698. dom.progress.addEventListener( 'click', onProgressClicked, false );
  699. }
  700. if( config.focusBodyOnPageVisibilityChange ) {
  701. var visibilityChange;
  702. if( 'hidden' in document ) {
  703. visibilityChange = 'visibilitychange';
  704. }
  705. else if( 'msHidden' in document ) {
  706. visibilityChange = 'msvisibilitychange';
  707. }
  708. else if( 'webkitHidden' in document ) {
  709. visibilityChange = 'webkitvisibilitychange';
  710. }
  711. if( visibilityChange ) {
  712. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  713. }
  714. }
  715. // Listen to both touch and click events, in case the device
  716. // supports both
  717. var pointerEvents = [ 'touchstart', 'click' ];
  718. // Only support touch for Android, fixes double navigations in
  719. // stock browser
  720. if( navigator.userAgent.match( /android/gi ) ) {
  721. pointerEvents = [ 'touchstart' ];
  722. }
  723. pointerEvents.forEach( function( eventName ) {
  724. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  725. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  726. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  727. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  728. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  729. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  730. } );
  731. }
  732. /**
  733. * Unbinds all event listeners.
  734. */
  735. function removeEventListeners() {
  736. eventsAreBound = false;
  737. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  738. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  739. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  740. window.removeEventListener( 'resize', onWindowResize, false );
  741. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  742. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  743. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  744. // IE11
  745. if( window.navigator.pointerEnabled ) {
  746. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  747. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  748. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  749. }
  750. // IE10
  751. else if( window.navigator.msPointerEnabled ) {
  752. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  753. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  754. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  755. }
  756. if ( config.progress && dom.progress ) {
  757. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  758. }
  759. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  760. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  761. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  762. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  763. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  764. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  765. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  766. } );
  767. }
  768. /**
  769. * Extend object a with the properties of object b.
  770. * If there's a conflict, object b takes precedence.
  771. */
  772. function extend( a, b ) {
  773. for( var i in b ) {
  774. a[ i ] = b[ i ];
  775. }
  776. }
  777. /**
  778. * Converts the target object to an array.
  779. */
  780. function toArray( o ) {
  781. return Array.prototype.slice.call( o );
  782. }
  783. /**
  784. * Utility for deserializing a value.
  785. */
  786. function deserialize( value ) {
  787. if( typeof value === 'string' ) {
  788. if( value === 'null' ) return null;
  789. else if( value === 'true' ) return true;
  790. else if( value === 'false' ) return false;
  791. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  792. }
  793. return value;
  794. }
  795. /**
  796. * Measures the distance in pixels between point a
  797. * and point b.
  798. *
  799. * @param {Object} a point with x/y properties
  800. * @param {Object} b point with x/y properties
  801. */
  802. function distanceBetween( a, b ) {
  803. var dx = a.x - b.x,
  804. dy = a.y - b.y;
  805. return Math.sqrt( dx*dx + dy*dy );
  806. }
  807. /**
  808. * Applies a CSS transform to the target element.
  809. */
  810. function transformElement( element, transform ) {
  811. element.style.WebkitTransform = transform;
  812. element.style.MozTransform = transform;
  813. element.style.msTransform = transform;
  814. element.style.OTransform = transform;
  815. element.style.transform = transform;
  816. }
  817. /**
  818. * Injects the given CSS styles into the DOM.
  819. */
  820. function injectStyleSheet( value ) {
  821. var tag = document.createElement( 'style' );
  822. tag.type = 'text/css';
  823. if( tag.styleSheet ) {
  824. tag.styleSheet.cssText = value;
  825. }
  826. else {
  827. tag.appendChild( document.createTextNode( value ) );
  828. }
  829. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  830. }
  831. /**
  832. * Retrieves the height of the given element by looking
  833. * at the position and height of its immediate children.
  834. */
  835. function getAbsoluteHeight( element ) {
  836. var height = 0;
  837. if( element ) {
  838. var absoluteChildren = 0;
  839. toArray( element.childNodes ).forEach( function( child ) {
  840. if( typeof child.offsetTop === 'number' && child.style ) {
  841. // Count # of abs children
  842. if( window.getComputedStyle( child ).position === 'absolute' ) {
  843. absoluteChildren += 1;
  844. }
  845. height = Math.max( height, child.offsetTop + child.offsetHeight );
  846. }
  847. } );
  848. // If there are no absolute children, use offsetHeight
  849. if( absoluteChildren === 0 ) {
  850. height = element.offsetHeight;
  851. }
  852. }
  853. return height;
  854. }
  855. /**
  856. * Returns the remaining height within the parent of the
  857. * target element.
  858. *
  859. * remaining height = [ configured parent height ] - [ current parent height ]
  860. */
  861. function getRemainingHeight( element, height ) {
  862. height = height || 0;
  863. if( element ) {
  864. var newHeight, oldHeight = element.style.height;
  865. // Change the .stretch element height to 0 in order find the height of all
  866. // the other elements
  867. element.style.height = '0px';
  868. newHeight = height - element.parentNode.offsetHeight;
  869. // Restore the old height, just in case
  870. element.style.height = oldHeight + 'px';
  871. return newHeight;
  872. }
  873. return height;
  874. }
  875. /**
  876. * Checks if this instance is being used to print a PDF.
  877. */
  878. function isPrintingPDF() {
  879. return ( /print-pdf/gi ).test( window.location.search );
  880. }
  881. /**
  882. * Hides the address bar if we're on a mobile device.
  883. */
  884. function hideAddressBar() {
  885. if( config.hideAddressBar && isMobileDevice ) {
  886. // Events that should trigger the address bar to hide
  887. window.addEventListener( 'load', removeAddressBar, false );
  888. window.addEventListener( 'orientationchange', removeAddressBar, false );
  889. }
  890. }
  891. /**
  892. * Causes the address bar to hide on mobile devices,
  893. * more vertical space ftw.
  894. */
  895. function removeAddressBar() {
  896. setTimeout( function() {
  897. window.scrollTo( 0, 1 );
  898. }, 10 );
  899. }
  900. /**
  901. * Dispatches an event of the specified type from the
  902. * reveal DOM element.
  903. */
  904. function dispatchEvent( type, args ) {
  905. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  906. event.initEvent( type, true, true );
  907. extend( event, args );
  908. dom.wrapper.dispatchEvent( event );
  909. // If we're in an iframe, post each reveal.js event to the
  910. // parent window. Used by the notes plugin
  911. if( config.postMessageEvents && window.parent !== window.self ) {
  912. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  913. }
  914. }
  915. /**
  916. * Wrap all links in 3D goodness.
  917. */
  918. function enableRollingLinks() {
  919. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  920. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  921. for( var i = 0, len = anchors.length; i < len; i++ ) {
  922. var anchor = anchors[i];
  923. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  924. var span = document.createElement('span');
  925. span.setAttribute('data-title', anchor.text);
  926. span.innerHTML = anchor.innerHTML;
  927. anchor.classList.add( 'roll' );
  928. anchor.innerHTML = '';
  929. anchor.appendChild(span);
  930. }
  931. }
  932. }
  933. }
  934. /**
  935. * Unwrap all 3D links.
  936. */
  937. function disableRollingLinks() {
  938. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  939. for( var i = 0, len = anchors.length; i < len; i++ ) {
  940. var anchor = anchors[i];
  941. var span = anchor.querySelector( 'span' );
  942. if( span ) {
  943. anchor.classList.remove( 'roll' );
  944. anchor.innerHTML = span.innerHTML;
  945. }
  946. }
  947. }
  948. /**
  949. * Bind preview frame links.
  950. */
  951. function enablePreviewLinks( selector ) {
  952. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  953. anchors.forEach( function( element ) {
  954. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  955. element.addEventListener( 'click', onPreviewLinkClicked, false );
  956. }
  957. } );
  958. }
  959. /**
  960. * Unbind preview frame links.
  961. */
  962. function disablePreviewLinks() {
  963. var anchors = toArray( document.querySelectorAll( 'a' ) );
  964. anchors.forEach( function( element ) {
  965. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  966. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  967. }
  968. } );
  969. }
  970. /**
  971. * Opens a preview window for the target URL.
  972. */
  973. function showPreview( url ) {
  974. closeOverlay();
  975. dom.overlay = document.createElement( 'div' );
  976. dom.overlay.classList.add( 'overlay' );
  977. dom.overlay.classList.add( 'overlay-preview' );
  978. dom.wrapper.appendChild( dom.overlay );
  979. dom.overlay.innerHTML = [
  980. '<header>',
  981. '<a class="close" href="#"><span class="icon"></span></a>',
  982. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  983. '</header>',
  984. '<div class="spinner"></div>',
  985. '<div class="viewport">',
  986. '<iframe src="'+ url +'"></iframe>',
  987. '</div>'
  988. ].join('');
  989. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  990. dom.overlay.classList.add( 'loaded' );
  991. }, false );
  992. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  993. closeOverlay();
  994. event.preventDefault();
  995. }, false );
  996. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  997. closeOverlay();
  998. }, false );
  999. setTimeout( function() {
  1000. dom.overlay.classList.add( 'visible' );
  1001. }, 1 );
  1002. }
  1003. /**
  1004. * Opens a overlay window with help material.
  1005. */
  1006. function showHelp() {
  1007. if( config.help ) {
  1008. closeOverlay();
  1009. dom.overlay = document.createElement( 'div' );
  1010. dom.overlay.classList.add( 'overlay' );
  1011. dom.overlay.classList.add( 'overlay-help' );
  1012. dom.wrapper.appendChild( dom.overlay );
  1013. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1014. html += '<table><th>KEY</th><th>ACTION</th>';
  1015. for( var key in keyboardShortcuts ) {
  1016. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1017. }
  1018. html += '</table>';
  1019. dom.overlay.innerHTML = [
  1020. '<header>',
  1021. '<a class="close" href="#"><span class="icon"></span></a>',
  1022. '</header>',
  1023. '<div class="viewport">',
  1024. '<div class="viewport-inner">'+ html +'</div>',
  1025. '</div>'
  1026. ].join('');
  1027. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1028. closeOverlay();
  1029. event.preventDefault();
  1030. }, false );
  1031. setTimeout( function() {
  1032. dom.overlay.classList.add( 'visible' );
  1033. }, 1 );
  1034. }
  1035. }
  1036. /**
  1037. * Closes any currently open overlay.
  1038. */
  1039. function closeOverlay() {
  1040. if( dom.overlay ) {
  1041. dom.overlay.parentNode.removeChild( dom.overlay );
  1042. dom.overlay = null;
  1043. }
  1044. }
  1045. /**
  1046. * Applies JavaScript-controlled layout rules to the
  1047. * presentation.
  1048. */
  1049. function layout() {
  1050. if( dom.wrapper && !isPrintingPDF() ) {
  1051. var size = getComputedSlideSize();
  1052. var slidePadding = 20; // TODO Dig this out of DOM
  1053. // Layout the contents of the slides
  1054. layoutSlideContents( config.width, config.height, slidePadding );
  1055. dom.slides.style.width = size.width + 'px';
  1056. dom.slides.style.height = size.height + 'px';
  1057. // Determine scale of content to fit within available space
  1058. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1059. // Respect max/min scale settings
  1060. scale = Math.max( scale, config.minScale );
  1061. scale = Math.min( scale, config.maxScale );
  1062. // Prefer zooming in desktop Chrome so that content remains crisp
  1063. if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  1064. dom.slides.style.zoom = scale;
  1065. }
  1066. // Apply scale transform as a fallback
  1067. else {
  1068. dom.slides.style.left = '50%';
  1069. dom.slides.style.top = '50%';
  1070. dom.slides.style.bottom = 'auto';
  1071. dom.slides.style.right = 'auto';
  1072. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  1073. }
  1074. // Select all slides, vertical and horizontal
  1075. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1076. for( var i = 0, len = slides.length; i < len; i++ ) {
  1077. var slide = slides[ i ];
  1078. // Don't bother updating invisible slides
  1079. if( slide.style.display === 'none' ) {
  1080. continue;
  1081. }
  1082. if( config.center || slide.classList.contains( 'center' ) ) {
  1083. // Vertical stacks are not centred since their section
  1084. // children will be
  1085. if( slide.classList.contains( 'stack' ) ) {
  1086. slide.style.top = 0;
  1087. }
  1088. else {
  1089. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  1090. }
  1091. }
  1092. else {
  1093. slide.style.top = '';
  1094. }
  1095. }
  1096. updateProgress();
  1097. updateParallax();
  1098. }
  1099. }
  1100. /**
  1101. * Applies layout logic to the contents of all slides in
  1102. * the presentation.
  1103. */
  1104. function layoutSlideContents( width, height, padding ) {
  1105. // Handle sizing of elements with the 'stretch' class
  1106. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1107. // Determine how much vertical space we can use
  1108. var remainingHeight = getRemainingHeight( element, height );
  1109. // Consider the aspect ratio of media elements
  1110. if( /(img|video)/gi.test( element.nodeName ) ) {
  1111. var nw = element.naturalWidth || element.videoWidth,
  1112. nh = element.naturalHeight || element.videoHeight;
  1113. var es = Math.min( width / nw, remainingHeight / nh );
  1114. element.style.width = ( nw * es ) + 'px';
  1115. element.style.height = ( nh * es ) + 'px';
  1116. }
  1117. else {
  1118. element.style.width = width + 'px';
  1119. element.style.height = remainingHeight + 'px';
  1120. }
  1121. } );
  1122. }
  1123. /**
  1124. * Calculates the computed pixel size of our slides. These
  1125. * values are based on the width and height configuration
  1126. * options.
  1127. */
  1128. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1129. var size = {
  1130. // Slide size
  1131. width: config.width,
  1132. height: config.height,
  1133. // Presentation size
  1134. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1135. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1136. };
  1137. // Reduce available space by margin
  1138. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1139. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1140. // Slide width may be a percentage of available width
  1141. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1142. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1143. }
  1144. // Slide height may be a percentage of available height
  1145. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1146. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1147. }
  1148. return size;
  1149. }
  1150. /**
  1151. * Stores the vertical index of a stack so that the same
  1152. * vertical slide can be selected when navigating to and
  1153. * from the stack.
  1154. *
  1155. * @param {HTMLElement} stack The vertical stack element
  1156. * @param {int} v Index to memorize
  1157. */
  1158. function setPreviousVerticalIndex( stack, v ) {
  1159. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1160. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1161. }
  1162. }
  1163. /**
  1164. * Retrieves the vertical index which was stored using
  1165. * #setPreviousVerticalIndex() or 0 if no previous index
  1166. * exists.
  1167. *
  1168. * @param {HTMLElement} stack The vertical stack element
  1169. */
  1170. function getPreviousVerticalIndex( stack ) {
  1171. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1172. // Prefer manually defined start-indexv
  1173. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1174. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1175. }
  1176. return 0;
  1177. }
  1178. /**
  1179. * Displays the overview of slides (quick nav) by
  1180. * scaling down and arranging all slide elements.
  1181. *
  1182. * Experimental feature, might be dropped if perf
  1183. * can't be improved.
  1184. */
  1185. function activateOverview() {
  1186. // Only proceed if enabled in config
  1187. if( config.overview ) {
  1188. // Don't auto-slide while in overview mode
  1189. cancelAutoSlide();
  1190. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1191. // Vary the depth of the overview based on screen size
  1192. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1193. dom.wrapper.classList.add( 'overview' );
  1194. dom.wrapper.classList.remove( 'overview-deactivating' );
  1195. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1196. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1197. var hslide = horizontalSlides[i],
  1198. hoffset = config.rtl ? -105 : 105;
  1199. hslide.setAttribute( 'data-index-h', i );
  1200. // Apply CSS transform
  1201. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1202. if( hslide.classList.contains( 'stack' ) ) {
  1203. var verticalSlides = hslide.querySelectorAll( 'section' );
  1204. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1205. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1206. var vslide = verticalSlides[j];
  1207. vslide.setAttribute( 'data-index-h', i );
  1208. vslide.setAttribute( 'data-index-v', j );
  1209. // Apply CSS transform
  1210. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1211. // Navigate to this slide on click
  1212. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1213. }
  1214. }
  1215. else {
  1216. // Navigate to this slide on click
  1217. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1218. }
  1219. }
  1220. updateSlidesVisibility();
  1221. layout();
  1222. if( !wasActive ) {
  1223. // Notify observers of the overview showing
  1224. dispatchEvent( 'overviewshown', {
  1225. 'indexh': indexh,
  1226. 'indexv': indexv,
  1227. 'currentSlide': currentSlide
  1228. } );
  1229. }
  1230. }
  1231. }
  1232. /**
  1233. * Exits the slide overview and enters the currently
  1234. * active slide.
  1235. */
  1236. function deactivateOverview() {
  1237. // Only proceed if enabled in config
  1238. if( config.overview ) {
  1239. dom.wrapper.classList.remove( 'overview' );
  1240. // Temporarily add a class so that transitions can do different things
  1241. // depending on whether they are exiting/entering overview, or just
  1242. // moving from slide to slide
  1243. dom.wrapper.classList.add( 'overview-deactivating' );
  1244. setTimeout( function () {
  1245. dom.wrapper.classList.remove( 'overview-deactivating' );
  1246. }, 1 );
  1247. // Select all slides
  1248. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1249. // Resets all transforms to use the external styles
  1250. transformElement( slide, '' );
  1251. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1252. } );
  1253. slide( indexh, indexv );
  1254. cueAutoSlide();
  1255. // Notify observers of the overview hiding
  1256. dispatchEvent( 'overviewhidden', {
  1257. 'indexh': indexh,
  1258. 'indexv': indexv,
  1259. 'currentSlide': currentSlide
  1260. } );
  1261. }
  1262. }
  1263. /**
  1264. * Toggles the slide overview mode on and off.
  1265. *
  1266. * @param {Boolean} override Optional flag which overrides the
  1267. * toggle logic and forcibly sets the desired state. True means
  1268. * overview is open, false means it's closed.
  1269. */
  1270. function toggleOverview( override ) {
  1271. if( typeof override === 'boolean' ) {
  1272. override ? activateOverview() : deactivateOverview();
  1273. }
  1274. else {
  1275. isOverview() ? deactivateOverview() : activateOverview();
  1276. }
  1277. }
  1278. /**
  1279. * Checks if the overview is currently active.
  1280. *
  1281. * @return {Boolean} true if the overview is active,
  1282. * false otherwise
  1283. */
  1284. function isOverview() {
  1285. return dom.wrapper.classList.contains( 'overview' );
  1286. }
  1287. /**
  1288. * Checks if the current or specified slide is vertical
  1289. * (nested within another slide).
  1290. *
  1291. * @param {HTMLElement} slide [optional] The slide to check
  1292. * orientation of
  1293. */
  1294. function isVerticalSlide( slide ) {
  1295. // Prefer slide argument, otherwise use current slide
  1296. slide = slide ? slide : currentSlide;
  1297. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1298. }
  1299. /**
  1300. * Handling the fullscreen functionality via the fullscreen API
  1301. *
  1302. * @see http://fullscreen.spec.whatwg.org/
  1303. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1304. */
  1305. function enterFullscreen() {
  1306. var element = document.body;
  1307. // Check which implementation is available
  1308. var requestMethod = element.requestFullScreen ||
  1309. element.webkitRequestFullscreen ||
  1310. element.webkitRequestFullScreen ||
  1311. element.mozRequestFullScreen ||
  1312. element.msRequestFullscreen;
  1313. if( requestMethod ) {
  1314. requestMethod.apply( element );
  1315. }
  1316. }
  1317. /**
  1318. * Enters the paused mode which fades everything on screen to
  1319. * black.
  1320. */
  1321. function pause() {
  1322. if( config.pause ) {
  1323. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1324. cancelAutoSlide();
  1325. dom.wrapper.classList.add( 'paused' );
  1326. if( wasPaused === false ) {
  1327. dispatchEvent( 'paused' );
  1328. }
  1329. }
  1330. }
  1331. /**
  1332. * Exits from the paused mode.
  1333. */
  1334. function resume() {
  1335. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1336. dom.wrapper.classList.remove( 'paused' );
  1337. cueAutoSlide();
  1338. if( wasPaused ) {
  1339. dispatchEvent( 'resumed' );
  1340. }
  1341. }
  1342. /**
  1343. * Toggles the paused mode on and off.
  1344. */
  1345. function togglePause( override ) {
  1346. if( typeof override === 'boolean' ) {
  1347. override ? pause() : resume();
  1348. }
  1349. else {
  1350. isPaused() ? resume() : pause();
  1351. }
  1352. }
  1353. /**
  1354. * Checks if we are currently in the paused mode.
  1355. */
  1356. function isPaused() {
  1357. return dom.wrapper.classList.contains( 'paused' );
  1358. }
  1359. /**
  1360. * Toggles the auto slide mode on and off.
  1361. *
  1362. * @param {Boolean} override Optional flag which sets the desired state.
  1363. * True means autoplay starts, false means it stops.
  1364. */
  1365. function toggleAutoSlide( override ) {
  1366. if( typeof override === 'boolean' ) {
  1367. override ? resumeAutoSlide() : pauseAutoSlide();
  1368. }
  1369. else {
  1370. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1371. }
  1372. }
  1373. /**
  1374. * Checks if the auto slide mode is currently on.
  1375. */
  1376. function isAutoSliding() {
  1377. return !!( autoSlide && !autoSlidePaused );
  1378. }
  1379. /**
  1380. * Steps from the current point in the presentation to the
  1381. * slide which matches the specified horizontal and vertical
  1382. * indices.
  1383. *
  1384. * @param {int} h Horizontal index of the target slide
  1385. * @param {int} v Vertical index of the target slide
  1386. * @param {int} f Optional index of a fragment within the
  1387. * target slide to activate
  1388. * @param {int} o Optional origin for use in multimaster environments
  1389. */
  1390. function slide( h, v, f, o ) {
  1391. // Remember where we were at before
  1392. previousSlide = currentSlide;
  1393. // Query all horizontal slides in the deck
  1394. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1395. // If no vertical index is specified and the upcoming slide is a
  1396. // stack, resume at its previous vertical index
  1397. if( v === undefined ) {
  1398. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1399. }
  1400. // If we were on a vertical stack, remember what vertical index
  1401. // it was on so we can resume at the same position when returning
  1402. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1403. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1404. }
  1405. // Remember the state before this slide
  1406. var stateBefore = state.concat();
  1407. // Reset the state array
  1408. state.length = 0;
  1409. var indexhBefore = indexh || 0,
  1410. indexvBefore = indexv || 0;
  1411. // Activate and transition to the new slide
  1412. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1413. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1414. // Update the visibility of slides now that the indices have changed
  1415. updateSlidesVisibility();
  1416. layout();
  1417. // Apply the new state
  1418. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1419. // Check if this state existed on the previous slide. If it
  1420. // did, we will avoid adding it repeatedly
  1421. for( var j = 0; j < stateBefore.length; j++ ) {
  1422. if( stateBefore[j] === state[i] ) {
  1423. stateBefore.splice( j, 1 );
  1424. continue stateLoop;
  1425. }
  1426. }
  1427. document.documentElement.classList.add( state[i] );
  1428. // Dispatch custom event matching the state's name
  1429. dispatchEvent( state[i] );
  1430. }
  1431. // Clean up the remains of the previous state
  1432. while( stateBefore.length ) {
  1433. document.documentElement.classList.remove( stateBefore.pop() );
  1434. }
  1435. // If the overview is active, re-activate it to update positions
  1436. if( isOverview() ) {
  1437. activateOverview();
  1438. }
  1439. // Find the current horizontal slide and any possible vertical slides
  1440. // within it
  1441. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1442. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1443. // Store references to the previous and current slides
  1444. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1445. // Show fragment, if specified
  1446. if( typeof f !== 'undefined' ) {
  1447. navigateFragment( f );
  1448. }
  1449. // Dispatch an event if the slide changed
  1450. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1451. if( slideChanged ) {
  1452. dispatchEvent( 'slidechanged', {
  1453. 'indexh': indexh,
  1454. 'indexv': indexv,
  1455. 'previousSlide': previousSlide,
  1456. 'currentSlide': currentSlide,
  1457. 'origin': o
  1458. } );
  1459. }
  1460. else {
  1461. // Ensure that the previous slide is never the same as the current
  1462. previousSlide = null;
  1463. }
  1464. // Solves an edge case where the previous slide maintains the
  1465. // 'present' class when navigating between adjacent vertical
  1466. // stacks
  1467. if( previousSlide ) {
  1468. previousSlide.classList.remove( 'present' );
  1469. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1470. // Reset all slides upon navigate to home
  1471. // Issue: #285
  1472. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1473. // Launch async task
  1474. setTimeout( function () {
  1475. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1476. for( i in slides ) {
  1477. if( slides[i] ) {
  1478. // Reset stack
  1479. setPreviousVerticalIndex( slides[i], 0 );
  1480. }
  1481. }
  1482. }, 0 );
  1483. }
  1484. }
  1485. // Handle embedded content
  1486. if( slideChanged || !previousSlide ) {
  1487. stopEmbeddedContent( previousSlide );
  1488. startEmbeddedContent( currentSlide );
  1489. }
  1490. // Announce the current slide contents, for screen readers
  1491. dom.statusDiv.textContent = currentSlide.textContent;
  1492. updateControls();
  1493. updateProgress();
  1494. updateBackground();
  1495. updateParallax();
  1496. updateSlideNumber();
  1497. // Update the URL hash
  1498. writeURL();
  1499. cueAutoSlide();
  1500. }
  1501. /**
  1502. * Syncs the presentation with the current DOM. Useful
  1503. * when new slides or control elements are added or when
  1504. * the configuration has changed.
  1505. */
  1506. function sync() {
  1507. // Subscribe to input
  1508. removeEventListeners();
  1509. addEventListeners();
  1510. // Force a layout to make sure the current config is accounted for
  1511. layout();
  1512. // Reflect the current autoSlide value
  1513. autoSlide = config.autoSlide;
  1514. // Start auto-sliding if it's enabled
  1515. cueAutoSlide();
  1516. // Re-create the slide backgrounds
  1517. createBackgrounds();
  1518. // Write the current hash to the URL
  1519. writeURL();
  1520. sortAllFragments();
  1521. updateControls();
  1522. updateProgress();
  1523. updateBackground( true );
  1524. updateSlideNumber();
  1525. updateSlidesVisibility();
  1526. formatEmbeddedContent();
  1527. }
  1528. /**
  1529. * Resets all vertical slides so that only the first
  1530. * is visible.
  1531. */
  1532. function resetVerticalSlides() {
  1533. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1534. horizontalSlides.forEach( function( horizontalSlide ) {
  1535. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1536. verticalSlides.forEach( function( verticalSlide, y ) {
  1537. if( y > 0 ) {
  1538. verticalSlide.classList.remove( 'present' );
  1539. verticalSlide.classList.remove( 'past' );
  1540. verticalSlide.classList.add( 'future' );
  1541. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1542. }
  1543. } );
  1544. } );
  1545. }
  1546. /**
  1547. * Sorts and formats all of fragments in the
  1548. * presentation.
  1549. */
  1550. function sortAllFragments() {
  1551. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1552. horizontalSlides.forEach( function( horizontalSlide ) {
  1553. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1554. verticalSlides.forEach( function( verticalSlide, y ) {
  1555. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1556. } );
  1557. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1558. } );
  1559. }
  1560. /**
  1561. * Updates one dimension of slides by showing the slide
  1562. * with the specified index.
  1563. *
  1564. * @param {String} selector A CSS selector that will fetch
  1565. * the group of slides we are working with
  1566. * @param {Number} index The index of the slide that should be
  1567. * shown
  1568. *
  1569. * @return {Number} The index of the slide that is now shown,
  1570. * might differ from the passed in index if it was out of
  1571. * bounds.
  1572. */
  1573. function updateSlides( selector, index ) {
  1574. // Select all slides and convert the NodeList result to
  1575. // an array
  1576. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1577. slidesLength = slides.length;
  1578. var printMode = isPrintingPDF();
  1579. if( slidesLength ) {
  1580. // Should the index loop?
  1581. if( config.loop ) {
  1582. index %= slidesLength;
  1583. if( index < 0 ) {
  1584. index = slidesLength + index;
  1585. }
  1586. }
  1587. // Enforce max and minimum index bounds
  1588. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1589. for( var i = 0; i < slidesLength; i++ ) {
  1590. var element = slides[i];
  1591. var reverse = config.rtl && !isVerticalSlide( element );
  1592. element.classList.remove( 'past' );
  1593. element.classList.remove( 'present' );
  1594. element.classList.remove( 'future' );
  1595. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1596. element.setAttribute( 'hidden', '' );
  1597. element.setAttribute( 'aria-hidden', 'true' );
  1598. // If this element contains vertical slides
  1599. if( element.querySelector( 'section' ) ) {
  1600. element.classList.add( 'stack' );
  1601. }
  1602. // If we're printing static slides, all slides are "present"
  1603. if( printMode ) {
  1604. element.classList.add( 'present' );
  1605. continue;
  1606. }
  1607. if( i < index ) {
  1608. // Any element previous to index is given the 'past' class
  1609. element.classList.add( reverse ? 'future' : 'past' );
  1610. if( config.fragments ) {
  1611. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1612. // Show all fragments on prior slides
  1613. while( pastFragments.length ) {
  1614. var pastFragment = pastFragments.pop();
  1615. pastFragment.classList.add( 'visible' );
  1616. pastFragment.classList.remove( 'current-fragment' );
  1617. }
  1618. }
  1619. }
  1620. else if( i > index ) {
  1621. // Any element subsequent to index is given the 'future' class
  1622. element.classList.add( reverse ? 'past' : 'future' );
  1623. if( config.fragments ) {
  1624. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1625. // No fragments in future slides should be visible ahead of time
  1626. while( futureFragments.length ) {
  1627. var futureFragment = futureFragments.pop();
  1628. futureFragment.classList.remove( 'visible' );
  1629. futureFragment.classList.remove( 'current-fragment' );
  1630. }
  1631. }
  1632. }
  1633. }
  1634. // Mark the current slide as present
  1635. slides[index].classList.add( 'present' );
  1636. slides[index].removeAttribute( 'hidden' );
  1637. slides[index].removeAttribute( 'aria-hidden' );
  1638. // If this slide has a state associated with it, add it
  1639. // onto the current state of the deck
  1640. var slideState = slides[index].getAttribute( 'data-state' );
  1641. if( slideState ) {
  1642. state = state.concat( slideState.split( ' ' ) );
  1643. }
  1644. }
  1645. else {
  1646. // Since there are no slides we can't be anywhere beyond the
  1647. // zeroth index
  1648. index = 0;
  1649. }
  1650. return index;
  1651. }
  1652. /**
  1653. * Optimization method; hide all slides that are far away
  1654. * from the present slide.
  1655. */
  1656. function updateSlidesVisibility() {
  1657. // Select all slides and convert the NodeList result to
  1658. // an array
  1659. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1660. horizontalSlidesLength = horizontalSlides.length,
  1661. distanceX,
  1662. distanceY;
  1663. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1664. // The number of steps away from the present slide that will
  1665. // be visible
  1666. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1667. // Limit view distance on weaker devices
  1668. if( isMobileDevice ) {
  1669. viewDistance = isOverview() ? 6 : 2;
  1670. }
  1671. // Limit view distance on weaker devices
  1672. if( isPrintingPDF() ) {
  1673. viewDistance = Number.MAX_VALUE;
  1674. }
  1675. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1676. var horizontalSlide = horizontalSlides[x];
  1677. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1678. verticalSlidesLength = verticalSlides.length;
  1679. // Loops so that it measures 1 between the first and last slides
  1680. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1681. // Show the horizontal slide if it's within the view distance
  1682. if( distanceX < viewDistance ) {
  1683. showSlide( horizontalSlide );
  1684. }
  1685. else {
  1686. hideSlide( horizontalSlide );
  1687. }
  1688. if( verticalSlidesLength ) {
  1689. var oy = getPreviousVerticalIndex( horizontalSlide );
  1690. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1691. var verticalSlide = verticalSlides[y];
  1692. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1693. if( distanceX + distanceY < viewDistance ) {
  1694. showSlide( verticalSlide );
  1695. }
  1696. else {
  1697. hideSlide( verticalSlide );
  1698. }
  1699. }
  1700. }
  1701. }
  1702. }
  1703. }
  1704. /**
  1705. * Updates the progress bar to reflect the current slide.
  1706. */
  1707. function updateProgress() {
  1708. // Update progress if enabled
  1709. if( config.progress && dom.progressbar ) {
  1710. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1711. }
  1712. }
  1713. /**
  1714. * Updates the slide number div to reflect the current slide.
  1715. */
  1716. function updateSlideNumber() {
  1717. // Update slide number if enabled
  1718. if( config.slideNumber && dom.slideNumber) {
  1719. // Display the number of the page using 'indexh - indexv' format
  1720. var indexString = indexh;
  1721. if( indexv > 0 ) {
  1722. indexString += ' - ' + indexv;
  1723. }
  1724. dom.slideNumber.innerHTML = indexString;
  1725. }
  1726. }
  1727. /**
  1728. * Updates the state of all control/navigation arrows.
  1729. */
  1730. function updateControls() {
  1731. var routes = availableRoutes();
  1732. var fragments = availableFragments();
  1733. // Remove the 'enabled' class from all directions
  1734. dom.controlsLeft.concat( dom.controlsRight )
  1735. .concat( dom.controlsUp )
  1736. .concat( dom.controlsDown )
  1737. .concat( dom.controlsPrev )
  1738. .concat( dom.controlsNext ).forEach( function( node ) {
  1739. node.classList.remove( 'enabled' );
  1740. node.classList.remove( 'fragmented' );
  1741. } );
  1742. // Add the 'enabled' class to the available routes
  1743. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1744. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1745. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1746. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1747. // Prev/next buttons
  1748. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1749. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1750. // Highlight fragment directions
  1751. if( currentSlide ) {
  1752. // Always apply fragment decorator to prev/next buttons
  1753. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1754. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1755. // Apply fragment decorators to directional buttons based on
  1756. // what slide axis they are in
  1757. if( isVerticalSlide( currentSlide ) ) {
  1758. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1759. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1760. }
  1761. else {
  1762. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1763. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1764. }
  1765. }
  1766. }
  1767. /**
  1768. * Updates the background elements to reflect the current
  1769. * slide.
  1770. *
  1771. * @param {Boolean} includeAll If true, the backgrounds of
  1772. * all vertical slides (not just the present) will be updated.
  1773. */
  1774. function updateBackground( includeAll ) {
  1775. var currentBackground = null;
  1776. // Reverse past/future classes when in RTL mode
  1777. var horizontalPast = config.rtl ? 'future' : 'past',
  1778. horizontalFuture = config.rtl ? 'past' : 'future';
  1779. // Update the classes of all backgrounds to match the
  1780. // states of their slides (past/present/future)
  1781. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1782. backgroundh.classList.remove( 'past' );
  1783. backgroundh.classList.remove( 'present' );
  1784. backgroundh.classList.remove( 'future' );
  1785. if( h < indexh ) {
  1786. backgroundh.classList.add( horizontalPast );
  1787. }
  1788. else if ( h > indexh ) {
  1789. backgroundh.classList.add( horizontalFuture );
  1790. }
  1791. else {
  1792. backgroundh.classList.add( 'present' );
  1793. // Store a reference to the current background element
  1794. currentBackground = backgroundh;
  1795. }
  1796. if( includeAll || h === indexh ) {
  1797. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1798. backgroundv.classList.remove( 'past' );
  1799. backgroundv.classList.remove( 'present' );
  1800. backgroundv.classList.remove( 'future' );
  1801. if( v < indexv ) {
  1802. backgroundv.classList.add( 'past' );
  1803. }
  1804. else if ( v > indexv ) {
  1805. backgroundv.classList.add( 'future' );
  1806. }
  1807. else {
  1808. backgroundv.classList.add( 'present' );
  1809. // Only if this is the present horizontal and vertical slide
  1810. if( h === indexh ) currentBackground = backgroundv;
  1811. }
  1812. } );
  1813. }
  1814. } );
  1815. // Stop any currently playing video background
  1816. if( previousBackground ) {
  1817. var previousVideo = previousBackground.querySelector( 'video' );
  1818. if( previousVideo ) previousVideo.pause();
  1819. }
  1820. if( currentBackground ) {
  1821. // Start video playback
  1822. var currentVideo = currentBackground.querySelector( 'video' );
  1823. if( currentVideo ) currentVideo.play();
  1824. // Don't transition between identical backgrounds. This
  1825. // prevents unwanted flicker.
  1826. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1827. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1828. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1829. dom.background.classList.add( 'no-transition' );
  1830. }
  1831. previousBackground = currentBackground;
  1832. }
  1833. // Allow the first background to apply without transition
  1834. setTimeout( function() {
  1835. dom.background.classList.remove( 'no-transition' );
  1836. }, 1 );
  1837. }
  1838. /**
  1839. * Updates the position of the parallax background based
  1840. * on the current slide index.
  1841. */
  1842. function updateParallax() {
  1843. if( config.parallaxBackgroundImage ) {
  1844. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1845. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1846. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1847. backgroundWidth, backgroundHeight;
  1848. if( backgroundSize.length === 1 ) {
  1849. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1850. }
  1851. else {
  1852. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1853. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1854. }
  1855. var slideWidth = dom.background.offsetWidth;
  1856. var horizontalSlideCount = horizontalSlides.length;
  1857. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1858. var slideHeight = dom.background.offsetHeight;
  1859. var verticalSlideCount = verticalSlides.length;
  1860. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1861. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1862. }
  1863. }
  1864. /**
  1865. * Called when the given slide is within the configured view
  1866. * distance. Shows the slide element and loads any content
  1867. * that is set to load lazily (data-src).
  1868. */
  1869. function showSlide( slide ) {
  1870. // Show the slide element
  1871. slide.style.display = 'block';
  1872. // Media elements with data-src attributes
  1873. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1874. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1875. element.removeAttribute( 'data-src' );
  1876. } );
  1877. // Media elements with <source> children
  1878. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1879. var sources = 0;
  1880. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1881. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1882. source.removeAttribute( 'data-src' );
  1883. sources += 1;
  1884. } );
  1885. // If we rewrote sources for this video/audio element, we need
  1886. // to manually tell it to load from its new origin
  1887. if( sources > 0 ) {
  1888. media.load();
  1889. }
  1890. } );
  1891. // Show the corresponding background element
  1892. var indices = getIndices( slide );
  1893. var background = getSlideBackground( indices.h, indices.v );
  1894. if( background ) {
  1895. background.style.display = 'block';
  1896. // If the background contains media, load it
  1897. if( background.hasAttribute( 'data-loaded' ) === false ) {
  1898. background.setAttribute( 'data-loaded', 'true' );
  1899. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  1900. backgroundVideo = slide.getAttribute( 'data-background-video' );
  1901. // Images
  1902. if( backgroundImage ) {
  1903. background.style.backgroundImage = 'url('+ backgroundImage +')';
  1904. }
  1905. // Videos
  1906. else if ( backgroundVideo ) {
  1907. var video = document.createElement( 'video' );
  1908. // Support comma separated lists of video sources
  1909. backgroundVideo.split( ',' ).forEach( function( source ) {
  1910. video.innerHTML += '<source src="'+ source +'">';
  1911. } );
  1912. background.appendChild( video );
  1913. }
  1914. }
  1915. }
  1916. }
  1917. /**
  1918. * Called when the given slide is moved outside of the
  1919. * configured view distance.
  1920. */
  1921. function hideSlide( slide ) {
  1922. // Hide the slide element
  1923. slide.style.display = 'none';
  1924. // Hide the corresponding background element
  1925. var indices = getIndices( slide );
  1926. var background = getSlideBackground( indices.h, indices.v );
  1927. if( background ) {
  1928. background.style.display = 'none';
  1929. }
  1930. }
  1931. /**
  1932. * Determine what available routes there are for navigation.
  1933. *
  1934. * @return {Object} containing four booleans: left/right/up/down
  1935. */
  1936. function availableRoutes() {
  1937. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1938. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1939. var routes = {
  1940. left: indexh > 0 || config.loop,
  1941. right: indexh < horizontalSlides.length - 1 || config.loop,
  1942. up: indexv > 0,
  1943. down: indexv < verticalSlides.length - 1
  1944. };
  1945. // reverse horizontal controls for rtl
  1946. if( config.rtl ) {
  1947. var left = routes.left;
  1948. routes.left = routes.right;
  1949. routes.right = left;
  1950. }
  1951. return routes;
  1952. }
  1953. /**
  1954. * Returns an object describing the available fragment
  1955. * directions.
  1956. *
  1957. * @return {Object} two boolean properties: prev/next
  1958. */
  1959. function availableFragments() {
  1960. if( currentSlide && config.fragments ) {
  1961. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1962. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1963. return {
  1964. prev: fragments.length - hiddenFragments.length > 0,
  1965. next: !!hiddenFragments.length
  1966. };
  1967. }
  1968. else {
  1969. return { prev: false, next: false };
  1970. }
  1971. }
  1972. /**
  1973. * Enforces origin-specific format rules for embedded media.
  1974. */
  1975. function formatEmbeddedContent() {
  1976. // YouTube frames must include "?enablejsapi=1"
  1977. toArray( dom.slides.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1978. var src = el.getAttribute( 'src' );
  1979. if( !/enablejsapi\=1/gi.test( src ) ) {
  1980. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'enablejsapi=1' );
  1981. }
  1982. });
  1983. // Vimeo frames must include "?api=1"
  1984. toArray( dom.slides.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  1985. var src = el.getAttribute( 'src' );
  1986. if( !/api\=1/gi.test( src ) ) {
  1987. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'api=1' );
  1988. }
  1989. });
  1990. }
  1991. /**
  1992. * Start playback of any embedded content inside of
  1993. * the targeted slide.
  1994. */
  1995. function startEmbeddedContent( slide ) {
  1996. if( slide && !isSpeakerNotes() ) {
  1997. // HTML5 media elements
  1998. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1999. if( el.hasAttribute( 'data-autoplay' ) ) {
  2000. el.play();
  2001. }
  2002. } );
  2003. // iframe embeds
  2004. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2005. el.contentWindow.postMessage( 'slide:start', '*' );
  2006. });
  2007. // YouTube embeds
  2008. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2009. if( el.hasAttribute( 'data-autoplay' ) ) {
  2010. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2011. }
  2012. });
  2013. // Vimeo embeds
  2014. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2015. if( el.hasAttribute( 'data-autoplay' ) ) {
  2016. el.contentWindow.postMessage( '{"method":"play"}', '*' );
  2017. }
  2018. });
  2019. }
  2020. }
  2021. /**
  2022. * Stop playback of any embedded content inside of
  2023. * the targeted slide.
  2024. */
  2025. function stopEmbeddedContent( slide ) {
  2026. if( slide && slide.parentNode ) {
  2027. // HTML5 media elements
  2028. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2029. if( !el.hasAttribute( 'data-ignore' ) ) {
  2030. el.pause();
  2031. }
  2032. } );
  2033. // iframe embeds
  2034. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2035. el.contentWindow.postMessage( 'slide:stop', '*' );
  2036. });
  2037. // YouTube embeds
  2038. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2039. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2040. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2041. }
  2042. });
  2043. // Vimeo embeds
  2044. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2045. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2046. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2047. }
  2048. });
  2049. }
  2050. }
  2051. /**
  2052. * Returns a value ranging from 0-1 that represents
  2053. * how far into the presentation we have navigated.
  2054. */
  2055. function getProgress() {
  2056. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2057. // The number of past and total slides
  2058. var totalCount = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2059. var pastCount = 0;
  2060. // Step through all slides and count the past ones
  2061. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2062. var horizontalSlide = horizontalSlides[i];
  2063. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2064. for( var j = 0; j < verticalSlides.length; j++ ) {
  2065. // Stop as soon as we arrive at the present
  2066. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2067. break mainLoop;
  2068. }
  2069. pastCount++;
  2070. }
  2071. // Stop as soon as we arrive at the present
  2072. if( horizontalSlide.classList.contains( 'present' ) ) {
  2073. break;
  2074. }
  2075. // Don't count the wrapping section for vertical slides
  2076. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2077. pastCount++;
  2078. }
  2079. }
  2080. if( currentSlide ) {
  2081. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2082. // If there are fragments in the current slide those should be
  2083. // accounted for in the progress.
  2084. if( allFragments.length > 0 ) {
  2085. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2086. // This value represents how big a portion of the slide progress
  2087. // that is made up by its fragments (0-1)
  2088. var fragmentWeight = 0.9;
  2089. // Add fragment progress to the past slide count
  2090. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2091. }
  2092. }
  2093. return pastCount / ( totalCount - 1 );
  2094. }
  2095. /**
  2096. * Checks if this presentation is running inside of the
  2097. * speaker notes window.
  2098. */
  2099. function isSpeakerNotes() {
  2100. return !!window.location.search.match( /receiver/gi );
  2101. }
  2102. /**
  2103. * Reads the current URL (hash) and navigates accordingly.
  2104. */
  2105. function readURL() {
  2106. var hash = window.location.hash;
  2107. // Attempt to parse the hash as either an index or name
  2108. var bits = hash.slice( 2 ).split( '/' ),
  2109. name = hash.replace( /#|\//gi, '' );
  2110. // If the first bit is invalid and there is a name we can
  2111. // assume that this is a named link
  2112. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2113. var element;
  2114. // Ensure the named link is a valid HTML ID attribute
  2115. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2116. // Find the slide with the specified ID
  2117. element = document.querySelector( '#' + name );
  2118. }
  2119. if( element ) {
  2120. // Find the position of the named slide and navigate to it
  2121. var indices = Reveal.getIndices( element );
  2122. slide( indices.h, indices.v );
  2123. }
  2124. // If the slide doesn't exist, navigate to the current slide
  2125. else {
  2126. slide( indexh || 0, indexv || 0 );
  2127. }
  2128. }
  2129. else {
  2130. // Read the index components of the hash
  2131. var h = parseInt( bits[0], 10 ) || 0,
  2132. v = parseInt( bits[1], 10 ) || 0;
  2133. if( h !== indexh || v !== indexv ) {
  2134. slide( h, v );
  2135. }
  2136. }
  2137. }
  2138. /**
  2139. * Updates the page URL (hash) to reflect the current
  2140. * state.
  2141. *
  2142. * @param {Number} delay The time in ms to wait before
  2143. * writing the hash
  2144. */
  2145. function writeURL( delay ) {
  2146. if( config.history ) {
  2147. // Make sure there's never more than one timeout running
  2148. clearTimeout( writeURLTimeout );
  2149. // If a delay is specified, timeout this call
  2150. if( typeof delay === 'number' ) {
  2151. writeURLTimeout = setTimeout( writeURL, delay );
  2152. }
  2153. else if( currentSlide ) {
  2154. var url = '/';
  2155. // Attempt to create a named link based on the slide's ID
  2156. var id = currentSlide.getAttribute( 'id' );
  2157. if( id ) {
  2158. id = id.toLowerCase();
  2159. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2160. }
  2161. // If the current slide has an ID, use that as a named link
  2162. if( typeof id === 'string' && id.length ) {
  2163. url = '/' + id;
  2164. }
  2165. // Otherwise use the /h/v index
  2166. else {
  2167. if( indexh > 0 || indexv > 0 ) url += indexh;
  2168. if( indexv > 0 ) url += '/' + indexv;
  2169. }
  2170. window.location.hash = url;
  2171. }
  2172. }
  2173. }
  2174. /**
  2175. * Retrieves the h/v location of the current, or specified,
  2176. * slide.
  2177. *
  2178. * @param {HTMLElement} slide If specified, the returned
  2179. * index will be for this slide rather than the currently
  2180. * active one
  2181. *
  2182. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2183. */
  2184. function getIndices( slide ) {
  2185. // By default, return the current indices
  2186. var h = indexh,
  2187. v = indexv,
  2188. f;
  2189. // If a slide is specified, return the indices of that slide
  2190. if( slide ) {
  2191. var isVertical = isVerticalSlide( slide );
  2192. var slideh = isVertical ? slide.parentNode : slide;
  2193. // Select all horizontal slides
  2194. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2195. // Now that we know which the horizontal slide is, get its index
  2196. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2197. // Assume we're not vertical
  2198. v = undefined;
  2199. // If this is a vertical slide, grab the vertical index
  2200. if( isVertical ) {
  2201. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2202. }
  2203. }
  2204. if( !slide && currentSlide ) {
  2205. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2206. if( hasFragments ) {
  2207. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2208. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2209. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2210. }
  2211. else {
  2212. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2213. }
  2214. }
  2215. }
  2216. return { h: h, v: v, f: f };
  2217. }
  2218. /**
  2219. * Retrieves the total number of slides in this presentation.
  2220. */
  2221. function getTotalSlides() {
  2222. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2223. }
  2224. /**
  2225. * Returns the slide element matching the specified index.
  2226. */
  2227. function getSlide( x, y ) {
  2228. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2229. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2230. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2231. return verticalSlides ? verticalSlides[ y ] : undefined;
  2232. }
  2233. return horizontalSlide;
  2234. }
  2235. /**
  2236. * Returns the background element for the given slide.
  2237. * All slides, even the ones with no background properties
  2238. * defined, have a background element so as long as the
  2239. * index is valid an element will be returned.
  2240. */
  2241. function getSlideBackground( x, y ) {
  2242. // When printing to PDF the slide backgrounds are nested
  2243. // inside of the slides
  2244. if( isPrintingPDF() ) {
  2245. var slide = getSlide( x, y );
  2246. if( slide ) {
  2247. var background = slide.querySelector( '.slide-background' );
  2248. if( background && background.parentNode === slide ) {
  2249. return background;
  2250. }
  2251. }
  2252. return undefined;
  2253. }
  2254. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2255. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2256. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2257. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2258. }
  2259. return horizontalBackground;
  2260. }
  2261. /**
  2262. * Retrieves the current state of the presentation as
  2263. * an object. This state can then be restored at any
  2264. * time.
  2265. */
  2266. function getState() {
  2267. var indices = getIndices();
  2268. return {
  2269. indexh: indices.h,
  2270. indexv: indices.v,
  2271. indexf: indices.f,
  2272. paused: isPaused(),
  2273. overview: isOverview()
  2274. };
  2275. }
  2276. /**
  2277. * Restores the presentation to the given state.
  2278. *
  2279. * @param {Object} state As generated by getState()
  2280. */
  2281. function setState( state ) {
  2282. if( typeof state === 'object' ) {
  2283. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2284. var pausedFlag = deserialize( state.paused ),
  2285. overviewFlag = deserialize( state.overview );
  2286. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2287. togglePause( pausedFlag );
  2288. }
  2289. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2290. toggleOverview( overviewFlag );
  2291. }
  2292. }
  2293. }
  2294. /**
  2295. * Return a sorted fragments list, ordered by an increasing
  2296. * "data-fragment-index" attribute.
  2297. *
  2298. * Fragments will be revealed in the order that they are returned by
  2299. * this function, so you can use the index attributes to control the
  2300. * order of fragment appearance.
  2301. *
  2302. * To maintain a sensible default fragment order, fragments are presumed
  2303. * to be passed in document order. This function adds a "fragment-index"
  2304. * attribute to each node if such an attribute is not already present,
  2305. * and sets that attribute to an integer value which is the position of
  2306. * the fragment within the fragments list.
  2307. */
  2308. function sortFragments( fragments ) {
  2309. fragments = toArray( fragments );
  2310. var ordered = [],
  2311. unordered = [],
  2312. sorted = [];
  2313. // Group ordered and unordered elements
  2314. fragments.forEach( function( fragment, i ) {
  2315. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2316. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2317. if( !ordered[index] ) {
  2318. ordered[index] = [];
  2319. }
  2320. ordered[index].push( fragment );
  2321. }
  2322. else {
  2323. unordered.push( [ fragment ] );
  2324. }
  2325. } );
  2326. // Append fragments without explicit indices in their
  2327. // DOM order
  2328. ordered = ordered.concat( unordered );
  2329. // Manually count the index up per group to ensure there
  2330. // are no gaps
  2331. var index = 0;
  2332. // Push all fragments in their sorted order to an array,
  2333. // this flattens the groups
  2334. ordered.forEach( function( group ) {
  2335. group.forEach( function( fragment ) {
  2336. sorted.push( fragment );
  2337. fragment.setAttribute( 'data-fragment-index', index );
  2338. } );
  2339. index ++;
  2340. } );
  2341. return sorted;
  2342. }
  2343. /**
  2344. * Navigate to the specified slide fragment.
  2345. *
  2346. * @param {Number} index The index of the fragment that
  2347. * should be shown, -1 means all are invisible
  2348. * @param {Number} offset Integer offset to apply to the
  2349. * fragment index
  2350. *
  2351. * @return {Boolean} true if a change was made in any
  2352. * fragments visibility as part of this call
  2353. */
  2354. function navigateFragment( index, offset ) {
  2355. if( currentSlide && config.fragments ) {
  2356. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2357. if( fragments.length ) {
  2358. // If no index is specified, find the current
  2359. if( typeof index !== 'number' ) {
  2360. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2361. if( lastVisibleFragment ) {
  2362. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2363. }
  2364. else {
  2365. index = -1;
  2366. }
  2367. }
  2368. // If an offset is specified, apply it to the index
  2369. if( typeof offset === 'number' ) {
  2370. index += offset;
  2371. }
  2372. var fragmentsShown = [],
  2373. fragmentsHidden = [];
  2374. toArray( fragments ).forEach( function( element, i ) {
  2375. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2376. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2377. }
  2378. // Visible fragments
  2379. if( i <= index ) {
  2380. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2381. element.classList.add( 'visible' );
  2382. element.classList.remove( 'current-fragment' );
  2383. // Announce the fragments one by one to the Screen Reader
  2384. dom.statusDiv.innerHTML = element.textContent;
  2385. if( i === index ) {
  2386. element.classList.add( 'current-fragment' );
  2387. }
  2388. }
  2389. // Hidden fragments
  2390. else {
  2391. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2392. element.classList.remove( 'visible' );
  2393. element.classList.remove( 'current-fragment' );
  2394. }
  2395. } );
  2396. if( fragmentsHidden.length ) {
  2397. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2398. }
  2399. if( fragmentsShown.length ) {
  2400. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2401. }
  2402. updateControls();
  2403. updateProgress();
  2404. return !!( fragmentsShown.length || fragmentsHidden.length );
  2405. }
  2406. }
  2407. return false;
  2408. }
  2409. /**
  2410. * Navigate to the next slide fragment.
  2411. *
  2412. * @return {Boolean} true if there was a next fragment,
  2413. * false otherwise
  2414. */
  2415. function nextFragment() {
  2416. return navigateFragment( null, 1 );
  2417. }
  2418. /**
  2419. * Navigate to the previous slide fragment.
  2420. *
  2421. * @return {Boolean} true if there was a previous fragment,
  2422. * false otherwise
  2423. */
  2424. function previousFragment() {
  2425. return navigateFragment( null, -1 );
  2426. }
  2427. /**
  2428. * Cues a new automated slide if enabled in the config.
  2429. */
  2430. function cueAutoSlide() {
  2431. cancelAutoSlide();
  2432. if( currentSlide ) {
  2433. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2434. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2435. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2436. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2437. // Pick value in the following priority order:
  2438. // 1. Current fragment's data-autoslide
  2439. // 2. Current slide's data-autoslide
  2440. // 3. Parent slide's data-autoslide
  2441. // 4. Global autoSlide setting
  2442. if( fragmentAutoSlide ) {
  2443. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2444. }
  2445. else if( slideAutoSlide ) {
  2446. autoSlide = parseInt( slideAutoSlide, 10 );
  2447. }
  2448. else if( parentAutoSlide ) {
  2449. autoSlide = parseInt( parentAutoSlide, 10 );
  2450. }
  2451. else {
  2452. autoSlide = config.autoSlide;
  2453. }
  2454. // If there are media elements with data-autoplay,
  2455. // automatically set the autoSlide duration to the
  2456. // length of that media
  2457. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2458. if( el.hasAttribute( 'data-autoplay' ) ) {
  2459. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2460. autoSlide = ( el.duration * 1000 ) + 1000;
  2461. }
  2462. }
  2463. } );
  2464. // Cue the next auto-slide if:
  2465. // - There is an autoSlide value
  2466. // - Auto-sliding isn't paused by the user
  2467. // - The presentation isn't paused
  2468. // - The overview isn't active
  2469. // - The presentation isn't over
  2470. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  2471. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2472. autoSlideStartTime = Date.now();
  2473. }
  2474. if( autoSlidePlayer ) {
  2475. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2476. }
  2477. }
  2478. }
  2479. /**
  2480. * Cancels any ongoing request to auto-slide.
  2481. */
  2482. function cancelAutoSlide() {
  2483. clearTimeout( autoSlideTimeout );
  2484. autoSlideTimeout = -1;
  2485. }
  2486. function pauseAutoSlide() {
  2487. if( autoSlide && !autoSlidePaused ) {
  2488. autoSlidePaused = true;
  2489. dispatchEvent( 'autoslidepaused' );
  2490. clearTimeout( autoSlideTimeout );
  2491. if( autoSlidePlayer ) {
  2492. autoSlidePlayer.setPlaying( false );
  2493. }
  2494. }
  2495. }
  2496. function resumeAutoSlide() {
  2497. if( autoSlide && autoSlidePaused ) {
  2498. autoSlidePaused = false;
  2499. dispatchEvent( 'autoslideresumed' );
  2500. cueAutoSlide();
  2501. }
  2502. }
  2503. function navigateLeft() {
  2504. // Reverse for RTL
  2505. if( config.rtl ) {
  2506. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2507. slide( indexh + 1 );
  2508. }
  2509. }
  2510. // Normal navigation
  2511. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2512. slide( indexh - 1 );
  2513. }
  2514. }
  2515. function navigateRight() {
  2516. // Reverse for RTL
  2517. if( config.rtl ) {
  2518. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2519. slide( indexh - 1 );
  2520. }
  2521. }
  2522. // Normal navigation
  2523. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2524. slide( indexh + 1 );
  2525. }
  2526. }
  2527. function navigateUp() {
  2528. // Prioritize hiding fragments
  2529. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2530. slide( indexh, indexv - 1 );
  2531. }
  2532. }
  2533. function navigateDown() {
  2534. // Prioritize revealing fragments
  2535. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2536. slide( indexh, indexv + 1 );
  2537. }
  2538. }
  2539. /**
  2540. * Navigates backwards, prioritized in the following order:
  2541. * 1) Previous fragment
  2542. * 2) Previous vertical slide
  2543. * 3) Previous horizontal slide
  2544. */
  2545. function navigatePrev() {
  2546. // Prioritize revealing fragments
  2547. if( previousFragment() === false ) {
  2548. if( availableRoutes().up ) {
  2549. navigateUp();
  2550. }
  2551. else {
  2552. // Fetch the previous horizontal slide, if there is one
  2553. var previousSlide = dom.wrapper.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2554. if( previousSlide ) {
  2555. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2556. var h = indexh - 1;
  2557. slide( h, v );
  2558. }
  2559. }
  2560. }
  2561. }
  2562. /**
  2563. * Same as #navigatePrev() but navigates forwards.
  2564. */
  2565. function navigateNext() {
  2566. // Prioritize revealing fragments
  2567. if( nextFragment() === false ) {
  2568. availableRoutes().down ? navigateDown() : navigateRight();
  2569. }
  2570. // If auto-sliding is enabled we need to cue up
  2571. // another timeout
  2572. cueAutoSlide();
  2573. }
  2574. // --------------------------------------------------------------------//
  2575. // ----------------------------- EVENTS -------------------------------//
  2576. // --------------------------------------------------------------------//
  2577. /**
  2578. * Called by all event handlers that are based on user
  2579. * input.
  2580. */
  2581. function onUserInput( event ) {
  2582. if( config.autoSlideStoppable ) {
  2583. pauseAutoSlide();
  2584. }
  2585. }
  2586. /**
  2587. * Handler for the document level 'keypress' event.
  2588. */
  2589. function onDocumentKeyPress( event ) {
  2590. // Check if the pressed key is question mark
  2591. if( event.shiftKey && event.charCode === 63 ) {
  2592. if( dom.overlay ) {
  2593. closeOverlay();
  2594. }
  2595. else {
  2596. showHelp( true );
  2597. }
  2598. }
  2599. }
  2600. /**
  2601. * Handler for the document level 'keydown' event.
  2602. */
  2603. function onDocumentKeyDown( event ) {
  2604. // If there's a condition specified and it returns false,
  2605. // ignore this event
  2606. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2607. return true;
  2608. }
  2609. // Remember if auto-sliding was paused so we can toggle it
  2610. var autoSlideWasPaused = autoSlidePaused;
  2611. onUserInput( event );
  2612. // Check if there's a focused element that could be using
  2613. // the keyboard
  2614. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  2615. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  2616. // Disregard the event if there's a focused element or a
  2617. // keyboard modifier key is present
  2618. if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2619. // While paused only allow "unpausing" keyboard events (b and .)
  2620. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2621. return false;
  2622. }
  2623. var triggered = false;
  2624. // 1. User defined key bindings
  2625. if( typeof config.keyboard === 'object' ) {
  2626. for( var key in config.keyboard ) {
  2627. // Check if this binding matches the pressed key
  2628. if( parseInt( key, 10 ) === event.keyCode ) {
  2629. var value = config.keyboard[ key ];
  2630. // Callback function
  2631. if( typeof value === 'function' ) {
  2632. value.apply( null, [ event ] );
  2633. }
  2634. // String shortcuts to reveal.js API
  2635. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2636. Reveal[ value ].call();
  2637. }
  2638. triggered = true;
  2639. }
  2640. }
  2641. }
  2642. // 2. System defined key bindings
  2643. if( triggered === false ) {
  2644. // Assume true and try to prove false
  2645. triggered = true;
  2646. switch( event.keyCode ) {
  2647. // p, page up
  2648. case 80: case 33: navigatePrev(); break;
  2649. // n, page down
  2650. case 78: case 34: navigateNext(); break;
  2651. // h, left
  2652. case 72: case 37: navigateLeft(); break;
  2653. // l, right
  2654. case 76: case 39: navigateRight(); break;
  2655. // k, up
  2656. case 75: case 38: navigateUp(); break;
  2657. // j, down
  2658. case 74: case 40: navigateDown(); break;
  2659. // home
  2660. case 36: slide( 0 ); break;
  2661. // end
  2662. case 35: slide( Number.MAX_VALUE ); break;
  2663. // space
  2664. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2665. // return
  2666. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2667. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2668. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2669. // f
  2670. case 70: enterFullscreen(); break;
  2671. // a
  2672. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2673. default:
  2674. triggered = false;
  2675. }
  2676. }
  2677. // If the input resulted in a triggered action we should prevent
  2678. // the browsers default behavior
  2679. if( triggered ) {
  2680. event.preventDefault && event.preventDefault();
  2681. }
  2682. // ESC or O key
  2683. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2684. if( dom.overlay ) {
  2685. closeOverlay();
  2686. }
  2687. else {
  2688. toggleOverview();
  2689. }
  2690. event.preventDefault && event.preventDefault();
  2691. }
  2692. // If auto-sliding is enabled we need to cue up
  2693. // another timeout
  2694. cueAutoSlide();
  2695. }
  2696. /**
  2697. * Handler for the 'touchstart' event, enables support for
  2698. * swipe and pinch gestures.
  2699. */
  2700. function onTouchStart( event ) {
  2701. touch.startX = event.touches[0].clientX;
  2702. touch.startY = event.touches[0].clientY;
  2703. touch.startCount = event.touches.length;
  2704. // If there's two touches we need to memorize the distance
  2705. // between those two points to detect pinching
  2706. if( event.touches.length === 2 && config.overview ) {
  2707. touch.startSpan = distanceBetween( {
  2708. x: event.touches[1].clientX,
  2709. y: event.touches[1].clientY
  2710. }, {
  2711. x: touch.startX,
  2712. y: touch.startY
  2713. } );
  2714. }
  2715. }
  2716. /**
  2717. * Handler for the 'touchmove' event.
  2718. */
  2719. function onTouchMove( event ) {
  2720. // Each touch should only trigger one action
  2721. if( !touch.captured ) {
  2722. onUserInput( event );
  2723. var currentX = event.touches[0].clientX;
  2724. var currentY = event.touches[0].clientY;
  2725. // If the touch started with two points and still has
  2726. // two active touches; test for the pinch gesture
  2727. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2728. // The current distance in pixels between the two touch points
  2729. var currentSpan = distanceBetween( {
  2730. x: event.touches[1].clientX,
  2731. y: event.touches[1].clientY
  2732. }, {
  2733. x: touch.startX,
  2734. y: touch.startY
  2735. } );
  2736. // If the span is larger than the desire amount we've got
  2737. // ourselves a pinch
  2738. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2739. touch.captured = true;
  2740. if( currentSpan < touch.startSpan ) {
  2741. activateOverview();
  2742. }
  2743. else {
  2744. deactivateOverview();
  2745. }
  2746. }
  2747. event.preventDefault();
  2748. }
  2749. // There was only one touch point, look for a swipe
  2750. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2751. var deltaX = currentX - touch.startX,
  2752. deltaY = currentY - touch.startY;
  2753. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2754. touch.captured = true;
  2755. navigateLeft();
  2756. }
  2757. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2758. touch.captured = true;
  2759. navigateRight();
  2760. }
  2761. else if( deltaY > touch.threshold ) {
  2762. touch.captured = true;
  2763. navigateUp();
  2764. }
  2765. else if( deltaY < -touch.threshold ) {
  2766. touch.captured = true;
  2767. navigateDown();
  2768. }
  2769. // If we're embedded, only block touch events if they have
  2770. // triggered an action
  2771. if( config.embedded ) {
  2772. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2773. event.preventDefault();
  2774. }
  2775. }
  2776. // Not embedded? Block them all to avoid needless tossing
  2777. // around of the viewport in iOS
  2778. else {
  2779. event.preventDefault();
  2780. }
  2781. }
  2782. }
  2783. // There's a bug with swiping on some Android devices unless
  2784. // the default action is always prevented
  2785. else if( navigator.userAgent.match( /android/gi ) ) {
  2786. event.preventDefault();
  2787. }
  2788. }
  2789. /**
  2790. * Handler for the 'touchend' event.
  2791. */
  2792. function onTouchEnd( event ) {
  2793. touch.captured = false;
  2794. }
  2795. /**
  2796. * Convert pointer down to touch start.
  2797. */
  2798. function onPointerDown( event ) {
  2799. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2800. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2801. onTouchStart( event );
  2802. }
  2803. }
  2804. /**
  2805. * Convert pointer move to touch move.
  2806. */
  2807. function onPointerMove( event ) {
  2808. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2809. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2810. onTouchMove( event );
  2811. }
  2812. }
  2813. /**
  2814. * Convert pointer up to touch end.
  2815. */
  2816. function onPointerUp( event ) {
  2817. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2818. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2819. onTouchEnd( event );
  2820. }
  2821. }
  2822. /**
  2823. * Handles mouse wheel scrolling, throttled to avoid skipping
  2824. * multiple slides.
  2825. */
  2826. function onDocumentMouseScroll( event ) {
  2827. if( Date.now() - lastMouseWheelStep > 600 ) {
  2828. lastMouseWheelStep = Date.now();
  2829. var delta = event.detail || -event.wheelDelta;
  2830. if( delta > 0 ) {
  2831. navigateNext();
  2832. }
  2833. else {
  2834. navigatePrev();
  2835. }
  2836. }
  2837. }
  2838. /**
  2839. * Clicking on the progress bar results in a navigation to the
  2840. * closest approximate horizontal slide using this equation:
  2841. *
  2842. * ( clickX / presentationWidth ) * numberOfSlides
  2843. */
  2844. function onProgressClicked( event ) {
  2845. onUserInput( event );
  2846. event.preventDefault();
  2847. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2848. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2849. slide( slideIndex );
  2850. }
  2851. /**
  2852. * Event handler for navigation control buttons.
  2853. */
  2854. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2855. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2856. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2857. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2858. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2859. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2860. /**
  2861. * Handler for the window level 'hashchange' event.
  2862. */
  2863. function onWindowHashChange( event ) {
  2864. readURL();
  2865. }
  2866. /**
  2867. * Handler for the window level 'resize' event.
  2868. */
  2869. function onWindowResize( event ) {
  2870. layout();
  2871. }
  2872. /**
  2873. * Handle for the window level 'visibilitychange' event.
  2874. */
  2875. function onPageVisibilityChange( event ) {
  2876. var isHidden = document.webkitHidden ||
  2877. document.msHidden ||
  2878. document.hidden;
  2879. // If, after clicking a link or similar and we're coming back,
  2880. // focus the document.body to ensure we can use keyboard shortcuts
  2881. if( isHidden === false && document.activeElement !== document.body ) {
  2882. document.activeElement.blur();
  2883. document.body.focus();
  2884. }
  2885. }
  2886. /**
  2887. * Invoked when a slide is and we're in the overview.
  2888. */
  2889. function onOverviewSlideClicked( event ) {
  2890. // TODO There's a bug here where the event listeners are not
  2891. // removed after deactivating the overview.
  2892. if( eventsAreBound && isOverview() ) {
  2893. event.preventDefault();
  2894. var element = event.target;
  2895. while( element && !element.nodeName.match( /section/gi ) ) {
  2896. element = element.parentNode;
  2897. }
  2898. if( element && !element.classList.contains( 'disabled' ) ) {
  2899. deactivateOverview();
  2900. if( element.nodeName.match( /section/gi ) ) {
  2901. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2902. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2903. slide( h, v );
  2904. }
  2905. }
  2906. }
  2907. }
  2908. /**
  2909. * Handles clicks on links that are set to preview in the
  2910. * iframe overlay.
  2911. */
  2912. function onPreviewLinkClicked( event ) {
  2913. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  2914. var url = event.currentTarget.getAttribute( 'href' );
  2915. if( url ) {
  2916. showPreview( url );
  2917. event.preventDefault();
  2918. }
  2919. }
  2920. }
  2921. /**
  2922. * Handles click on the auto-sliding controls element.
  2923. */
  2924. function onAutoSlidePlayerClick( event ) {
  2925. // Replay
  2926. if( Reveal.isLastSlide() && config.loop === false ) {
  2927. slide( 0, 0 );
  2928. resumeAutoSlide();
  2929. }
  2930. // Resume
  2931. else if( autoSlidePaused ) {
  2932. resumeAutoSlide();
  2933. }
  2934. // Pause
  2935. else {
  2936. pauseAutoSlide();
  2937. }
  2938. }
  2939. // --------------------------------------------------------------------//
  2940. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2941. // --------------------------------------------------------------------//
  2942. /**
  2943. * Constructor for the playback component, which displays
  2944. * play/pause/progress controls.
  2945. *
  2946. * @param {HTMLElement} container The component will append
  2947. * itself to this
  2948. * @param {Function} progressCheck A method which will be
  2949. * called frequently to get the current progress on a range
  2950. * of 0-1
  2951. */
  2952. function Playback( container, progressCheck ) {
  2953. // Cosmetics
  2954. this.diameter = 50;
  2955. this.thickness = 3;
  2956. // Flags if we are currently playing
  2957. this.playing = false;
  2958. // Current progress on a 0-1 range
  2959. this.progress = 0;
  2960. // Used to loop the animation smoothly
  2961. this.progressOffset = 1;
  2962. this.container = container;
  2963. this.progressCheck = progressCheck;
  2964. this.canvas = document.createElement( 'canvas' );
  2965. this.canvas.className = 'playback';
  2966. this.canvas.width = this.diameter;
  2967. this.canvas.height = this.diameter;
  2968. this.context = this.canvas.getContext( '2d' );
  2969. this.container.appendChild( this.canvas );
  2970. this.render();
  2971. }
  2972. Playback.prototype.setPlaying = function( value ) {
  2973. var wasPlaying = this.playing;
  2974. this.playing = value;
  2975. // Start repainting if we weren't already
  2976. if( !wasPlaying && this.playing ) {
  2977. this.animate();
  2978. }
  2979. else {
  2980. this.render();
  2981. }
  2982. };
  2983. Playback.prototype.animate = function() {
  2984. var progressBefore = this.progress;
  2985. this.progress = this.progressCheck();
  2986. // When we loop, offset the progress so that it eases
  2987. // smoothly rather than immediately resetting
  2988. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2989. this.progressOffset = this.progress;
  2990. }
  2991. this.render();
  2992. if( this.playing ) {
  2993. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2994. }
  2995. };
  2996. /**
  2997. * Renders the current progress and playback state.
  2998. */
  2999. Playback.prototype.render = function() {
  3000. var progress = this.playing ? this.progress : 0,
  3001. radius = ( this.diameter / 2 ) - this.thickness,
  3002. x = this.diameter / 2,
  3003. y = this.diameter / 2,
  3004. iconSize = 14;
  3005. // Ease towards 1
  3006. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3007. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3008. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3009. this.context.save();
  3010. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3011. // Solid background color
  3012. this.context.beginPath();
  3013. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  3014. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3015. this.context.fill();
  3016. // Draw progress track
  3017. this.context.beginPath();
  3018. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3019. this.context.lineWidth = this.thickness;
  3020. this.context.strokeStyle = '#666';
  3021. this.context.stroke();
  3022. if( this.playing ) {
  3023. // Draw progress on top of track
  3024. this.context.beginPath();
  3025. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3026. this.context.lineWidth = this.thickness;
  3027. this.context.strokeStyle = '#fff';
  3028. this.context.stroke();
  3029. }
  3030. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3031. // Draw play/pause icons
  3032. if( this.playing ) {
  3033. this.context.fillStyle = '#fff';
  3034. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  3035. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  3036. }
  3037. else {
  3038. this.context.beginPath();
  3039. this.context.translate( 2, 0 );
  3040. this.context.moveTo( 0, 0 );
  3041. this.context.lineTo( iconSize - 2, iconSize / 2 );
  3042. this.context.lineTo( 0, iconSize );
  3043. this.context.fillStyle = '#fff';
  3044. this.context.fill();
  3045. }
  3046. this.context.restore();
  3047. };
  3048. Playback.prototype.on = function( type, listener ) {
  3049. this.canvas.addEventListener( type, listener, false );
  3050. };
  3051. Playback.prototype.off = function( type, listener ) {
  3052. this.canvas.removeEventListener( type, listener, false );
  3053. };
  3054. Playback.prototype.destroy = function() {
  3055. this.playing = false;
  3056. if( this.canvas.parentNode ) {
  3057. this.container.removeChild( this.canvas );
  3058. }
  3059. };
  3060. // --------------------------------------------------------------------//
  3061. // ------------------------------- API --------------------------------//
  3062. // --------------------------------------------------------------------//
  3063. Reveal = {
  3064. initialize: initialize,
  3065. configure: configure,
  3066. sync: sync,
  3067. // Navigation methods
  3068. slide: slide,
  3069. left: navigateLeft,
  3070. right: navigateRight,
  3071. up: navigateUp,
  3072. down: navigateDown,
  3073. prev: navigatePrev,
  3074. next: navigateNext,
  3075. // Fragment methods
  3076. navigateFragment: navigateFragment,
  3077. prevFragment: previousFragment,
  3078. nextFragment: nextFragment,
  3079. // Deprecated aliases
  3080. navigateTo: slide,
  3081. navigateLeft: navigateLeft,
  3082. navigateRight: navigateRight,
  3083. navigateUp: navigateUp,
  3084. navigateDown: navigateDown,
  3085. navigatePrev: navigatePrev,
  3086. navigateNext: navigateNext,
  3087. // Forces an update in slide layout
  3088. layout: layout,
  3089. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3090. availableRoutes: availableRoutes,
  3091. // Returns an object with the available fragments as booleans (prev/next)
  3092. availableFragments: availableFragments,
  3093. // Toggles the overview mode on/off
  3094. toggleOverview: toggleOverview,
  3095. // Toggles the "black screen" mode on/off
  3096. togglePause: togglePause,
  3097. // Toggles the auto slide mode on/off
  3098. toggleAutoSlide: toggleAutoSlide,
  3099. // State checks
  3100. isOverview: isOverview,
  3101. isPaused: isPaused,
  3102. isAutoSliding: isAutoSliding,
  3103. // Adds or removes all internal event listeners (such as keyboard)
  3104. addEventListeners: addEventListeners,
  3105. removeEventListeners: removeEventListeners,
  3106. // Facility for persisting and restoring the presentation state
  3107. getState: getState,
  3108. setState: setState,
  3109. // Presentation progress on range of 0-1
  3110. getProgress: getProgress,
  3111. // Returns the indices of the current, or specified, slide
  3112. getIndices: getIndices,
  3113. getTotalSlides: getTotalSlides,
  3114. // Returns the slide element at the specified index
  3115. getSlide: getSlide,
  3116. // Returns the slide background element at the specified index
  3117. getSlideBackground: getSlideBackground,
  3118. // Returns the previous slide element, may be null
  3119. getPreviousSlide: function() {
  3120. return previousSlide;
  3121. },
  3122. // Returns the current slide element
  3123. getCurrentSlide: function() {
  3124. return currentSlide;
  3125. },
  3126. // Returns the current scale of the presentation content
  3127. getScale: function() {
  3128. return scale;
  3129. },
  3130. // Returns the current configuration object
  3131. getConfig: function() {
  3132. return config;
  3133. },
  3134. // Helper method, retrieves query string as a key/value hash
  3135. getQueryHash: function() {
  3136. var query = {};
  3137. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3138. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3139. } );
  3140. // Basic deserialization
  3141. for( var i in query ) {
  3142. var value = query[ i ];
  3143. query[ i ] = deserialize( unescape( value ) );
  3144. }
  3145. return query;
  3146. },
  3147. // Returns true if we're currently on the first slide
  3148. isFirstSlide: function() {
  3149. return ( indexh === 0 && indexv === 0 );
  3150. },
  3151. // Returns true if we're currently on the last slide
  3152. isLastSlide: function() {
  3153. if( currentSlide ) {
  3154. // Does this slide has next a sibling?
  3155. if( currentSlide.nextElementSibling ) return false;
  3156. // If it's vertical, does its parent have a next sibling?
  3157. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3158. return true;
  3159. }
  3160. return false;
  3161. },
  3162. // Checks if reveal.js has been loaded and is ready for use
  3163. isReady: function() {
  3164. return loaded;
  3165. },
  3166. // Forward event binding to the reveal DOM element
  3167. addEventListener: function( type, listener, useCapture ) {
  3168. if( 'addEventListener' in window ) {
  3169. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3170. }
  3171. },
  3172. removeEventListener: function( type, listener, useCapture ) {
  3173. if( 'addEventListener' in window ) {
  3174. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3175. }
  3176. },
  3177. // Programatically triggers a keyboard event
  3178. triggerKey: function( keyCode ) {
  3179. onDocumentKeyDown( { keyCode: keyCode } );
  3180. }
  3181. };
  3182. return Reveal;
  3183. }));