reveal.js 124 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970197119721973197419751976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030203120322033203420352036203720382039204020412042204320442045204620472048204920502051205220532054205520562057205820592060206120622063206420652066206720682069207020712072207320742075207620772078207920802081208220832084208520862087208820892090209120922093209420952096209720982099210021012102210321042105210621072108210921102111211221132114211521162117211821192120212121222123212421252126212721282129213021312132213321342135213621372138213921402141214221432144214521462147214821492150215121522153215421552156215721582159216021612162216321642165216621672168216921702171217221732174217521762177217821792180218121822183218421852186218721882189219021912192219321942195219621972198219922002201220222032204220522062207220822092210221122122213221422152216221722182219222022212222222322242225222622272228222922302231223222332234223522362237223822392240224122422243224422452246224722482249225022512252225322542255225622572258225922602261226222632264226522662267226822692270227122722273227422752276227722782279228022812282228322842285228622872288228922902291229222932294229522962297229822992300230123022303230423052306230723082309231023112312231323142315231623172318231923202321232223232324232523262327232823292330233123322333233423352336233723382339234023412342234323442345234623472348234923502351235223532354235523562357235823592360236123622363236423652366236723682369237023712372237323742375237623772378237923802381238223832384238523862387238823892390239123922393239423952396239723982399240024012402240324042405240624072408240924102411241224132414241524162417241824192420242124222423242424252426242724282429243024312432243324342435243624372438243924402441244224432444244524462447244824492450245124522453245424552456245724582459246024612462246324642465246624672468246924702471247224732474247524762477247824792480248124822483248424852486248724882489249024912492249324942495249624972498249925002501250225032504250525062507250825092510251125122513251425152516251725182519252025212522252325242525252625272528252925302531253225332534253525362537253825392540254125422543254425452546254725482549255025512552255325542555255625572558255925602561256225632564256525662567256825692570257125722573257425752576257725782579258025812582258325842585258625872588258925902591259225932594259525962597259825992600260126022603260426052606260726082609261026112612261326142615261626172618261926202621262226232624262526262627262826292630263126322633263426352636263726382639264026412642264326442645264626472648264926502651265226532654265526562657265826592660266126622663266426652666266726682669267026712672267326742675267626772678267926802681268226832684268526862687268826892690269126922693269426952696269726982699270027012702270327042705270627072708270927102711271227132714271527162717271827192720272127222723272427252726272727282729273027312732273327342735273627372738273927402741274227432744274527462747274827492750275127522753275427552756275727582759276027612762276327642765276627672768276927702771277227732774277527762777277827792780278127822783278427852786278727882789279027912792279327942795279627972798279928002801280228032804280528062807280828092810281128122813281428152816281728182819282028212822282328242825282628272828282928302831283228332834283528362837283828392840284128422843284428452846284728482849285028512852285328542855285628572858285928602861286228632864286528662867286828692870287128722873287428752876287728782879288028812882288328842885288628872888288928902891289228932894289528962897289828992900290129022903290429052906290729082909291029112912291329142915291629172918291929202921292229232924292529262927292829292930293129322933293429352936293729382939294029412942294329442945294629472948294929502951295229532954295529562957295829592960296129622963296429652966296729682969297029712972297329742975297629772978297929802981298229832984298529862987298829892990299129922993299429952996299729982999300030013002300330043005300630073008300930103011301230133014301530163017301830193020302130223023302430253026302730283029303030313032303330343035303630373038303930403041304230433044304530463047304830493050305130523053305430553056305730583059306030613062306330643065306630673068306930703071307230733074307530763077307830793080308130823083308430853086308730883089309030913092309330943095309630973098309931003101310231033104310531063107310831093110311131123113311431153116311731183119312031213122312331243125312631273128312931303131313231333134313531363137313831393140314131423143314431453146314731483149315031513152315331543155315631573158315931603161316231633164316531663167316831693170317131723173317431753176317731783179318031813182318331843185318631873188318931903191319231933194319531963197319831993200320132023203320432053206320732083209321032113212321332143215321632173218321932203221322232233224322532263227322832293230323132323233323432353236323732383239324032413242324332443245324632473248324932503251325232533254325532563257325832593260326132623263326432653266326732683269327032713272327332743275327632773278327932803281328232833284328532863287328832893290329132923293329432953296329732983299330033013302330333043305330633073308330933103311331233133314331533163317331833193320332133223323332433253326332733283329333033313332333333343335333633373338333933403341334233433344334533463347334833493350335133523353335433553356335733583359336033613362336333643365336633673368336933703371337233733374337533763377337833793380338133823383338433853386338733883389339033913392339333943395339633973398339934003401340234033404340534063407340834093410341134123413341434153416341734183419342034213422342334243425342634273428342934303431343234333434343534363437343834393440344134423443344434453446344734483449345034513452345334543455345634573458345934603461346234633464346534663467346834693470347134723473347434753476347734783479348034813482348334843485348634873488348934903491349234933494349534963497349834993500350135023503350435053506350735083509351035113512351335143515351635173518351935203521352235233524352535263527352835293530353135323533353435353536353735383539354035413542354335443545354635473548354935503551355235533554355535563557355835593560356135623563356435653566356735683569357035713572357335743575357635773578357935803581358235833584358535863587358835893590359135923593359435953596359735983599360036013602360336043605360636073608360936103611361236133614361536163617361836193620362136223623362436253626362736283629363036313632363336343635363636373638363936403641364236433644364536463647364836493650365136523653365436553656365736583659366036613662366336643665366636673668366936703671367236733674367536763677367836793680368136823683368436853686368736883689369036913692369336943695369636973698369937003701370237033704370537063707370837093710371137123713371437153716371737183719372037213722372337243725372637273728372937303731373237333734373537363737373837393740374137423743374437453746374737483749375037513752375337543755375637573758375937603761376237633764376537663767376837693770377137723773377437753776377737783779378037813782378337843785378637873788378937903791379237933794379537963797379837993800380138023803380438053806380738083809381038113812381338143815381638173818381938203821382238233824382538263827382838293830383138323833383438353836383738383839384038413842384338443845384638473848384938503851385238533854385538563857385838593860386138623863386438653866386738683869387038713872387338743875387638773878387938803881388238833884388538863887388838893890389138923893389438953896389738983899390039013902390339043905390639073908390939103911391239133914391539163917391839193920392139223923392439253926392739283929393039313932393339343935393639373938393939403941394239433944394539463947394839493950395139523953395439553956395739583959396039613962396339643965396639673968396939703971397239733974397539763977397839793980398139823983398439853986398739883989399039913992399339943995399639973998399940004001400240034004400540064007400840094010401140124013401440154016401740184019402040214022402340244025402640274028402940304031403240334034403540364037403840394040404140424043404440454046404740484049405040514052405340544055405640574058405940604061406240634064406540664067406840694070407140724073407440754076407740784079408040814082408340844085408640874088408940904091409240934094409540964097409840994100410141024103410441054106410741084109411041114112411341144115411641174118411941204121412241234124412541264127412841294130413141324133413441354136413741384139414041414142414341444145414641474148414941504151415241534154415541564157415841594160416141624163416441654166416741684169417041714172417341744175417641774178417941804181418241834184418541864187418841894190419141924193419441954196419741984199420042014202420342044205420642074208420942104211421242134214421542164217421842194220422142224223422442254226422742284229423042314232423342344235423642374238423942404241424242434244424542464247424842494250425142524253425442554256425742584259426042614262426342644265426642674268426942704271427242734274427542764277427842794280428142824283428442854286428742884289429042914292429342944295429642974298429943004301430243034304430543064307430843094310431143124313431443154316431743184319432043214322432343244325432643274328432943304331433243334334433543364337433843394340434143424343434443454346434743484349435043514352435343544355435643574358435943604361436243634364436543664367436843694370437143724373437443754376437743784379438043814382438343844385438643874388438943904391439243934394439543964397439843994400440144024403440444054406440744084409441044114412441344144415441644174418441944204421442244234424442544264427442844294430443144324433443444354436443744384439444044414442444344444445444644474448444944504451445244534454445544564457445844594460446144624463446444654466446744684469447044714472447344744475447644774478447944804481448244834484448544864487448844894490449144924493449444954496449744984499450045014502450345044505450645074508450945104511451245134514451545164517451845194520452145224523452445254526452745284529453045314532453345344535453645374538453945404541454245434544454545464547454845494550455145524553455445554556455745584559456045614562456345644565456645674568456945704571457245734574457545764577457845794580458145824583458445854586
  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2015 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. '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. // Configuration 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: 1.5,
  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. // Flags if speaker notes should be visible to all viewers
  73. showNotes: false,
  74. // Number of milliseconds between automatically proceeding to the
  75. // next slide, disabled when set to 0, this value can be overwritten
  76. // by using a data-autoslide attribute on your slides
  77. autoSlide: 0,
  78. // Stop auto-sliding after user input
  79. autoSlideStoppable: true,
  80. // Enable slide navigation via mouse wheel
  81. mouseWheel: false,
  82. // Apply a 3D roll to links on hover
  83. rollingLinks: false,
  84. // Hides the address bar on mobile devices
  85. hideAddressBar: true,
  86. // Opens links in an iframe preview overlay
  87. previewLinks: false,
  88. // Exposes the reveal.js API through window.postMessage
  89. postMessage: true,
  90. // Dispatches all reveal.js events to the parent window through postMessage
  91. postMessageEvents: false,
  92. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  93. focusBodyOnPageVisibilityChange: true,
  94. // Transition style
  95. transition: 'slide', // 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: 'fade', // 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. // Amount of pixels to move the parallax background per slide step
  105. parallaxBackgroundHorizontal: null,
  106. parallaxBackgroundVertical: null,
  107. // Number of slides away from the current that are visible
  108. viewDistance: 3,
  109. // Script dependencies to load
  110. dependencies: []
  111. },
  112. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  113. loaded = false,
  114. // Flags if the overview mode is currently active
  115. overview = false,
  116. // The horizontal and vertical index of the currently active slide
  117. indexh,
  118. indexv,
  119. // The previous and current slide HTML elements
  120. previousSlide,
  121. currentSlide,
  122. previousBackground,
  123. // Slides may hold a data-state attribute which we pick up and apply
  124. // as a class to the body. This list contains the combined state of
  125. // all current slides.
  126. state = [],
  127. // The current scale of the presentation (see width/height config)
  128. scale = 1,
  129. // CSS transform that is currently applied to the slides container,
  130. // split into two groups
  131. slidesTransform = { layout: '', overview: '' },
  132. // Cached references to DOM elements
  133. dom = {},
  134. // Features supported by the browser, see #checkCapabilities()
  135. features = {},
  136. // Client is a mobile device, see #checkCapabilities()
  137. isMobileDevice,
  138. // Throttles mouse wheel navigation
  139. lastMouseWheelStep = 0,
  140. // Delays updates to the URL due to a Chrome thumbnailer bug
  141. writeURLTimeout = 0,
  142. // Flags if the interaction event listeners are bound
  143. eventsAreBound = false,
  144. // The current auto-slide duration
  145. autoSlide = 0,
  146. // Auto slide properties
  147. autoSlidePlayer,
  148. autoSlideTimeout = 0,
  149. autoSlideStartTime = -1,
  150. autoSlidePaused = false,
  151. // Holds information about the currently ongoing touch input
  152. touch = {
  153. startX: 0,
  154. startY: 0,
  155. startSpan: 0,
  156. startCount: 0,
  157. captured: false,
  158. threshold: 40
  159. },
  160. // Holds information about the keyboard shortcuts
  161. keyboardShortcuts = {
  162. 'N , SPACE': 'Next slide',
  163. 'P': 'Previous slide',
  164. '← , H': 'Navigate left',
  165. '→ , L': 'Navigate right',
  166. '↑ , K': 'Navigate up',
  167. '↓ , J': 'Navigate down',
  168. 'Home': 'First slide',
  169. 'End': 'Last slide',
  170. 'B , .': 'Pause',
  171. 'F': 'Fullscreen',
  172. 'ESC, O': 'Slide overview'
  173. };
  174. /**
  175. * Starts up the presentation if the client is capable.
  176. */
  177. function initialize( options ) {
  178. checkCapabilities();
  179. if( !features.transforms2d && !features.transforms3d ) {
  180. document.body.setAttribute( 'class', 'no-transforms' );
  181. // Since JS won't be running any further, we load all lazy
  182. // loading elements upfront
  183. var images = toArray( document.getElementsByTagName( 'img' ) ),
  184. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  185. var lazyLoadable = images.concat( iframes );
  186. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  187. var element = lazyLoadable[i];
  188. if( element.getAttribute( 'data-src' ) ) {
  189. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  190. element.removeAttribute( 'data-src' );
  191. }
  192. }
  193. // If the browser doesn't support core features we won't be
  194. // using JavaScript to control the presentation
  195. return;
  196. }
  197. // Cache references to key DOM elements
  198. dom.wrapper = document.querySelector( '.reveal' );
  199. dom.slides = document.querySelector( '.reveal .slides' );
  200. // Force a layout when the whole page, incl fonts, has loaded
  201. window.addEventListener( 'load', layout, false );
  202. var query = Reveal.getQueryHash();
  203. // Do not accept new dependencies via query config to avoid
  204. // the potential of malicious script injection
  205. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  206. // Copy options over to our config object
  207. extend( config, options );
  208. extend( config, query );
  209. // Hide the address bar in mobile browsers
  210. hideAddressBar();
  211. // Loads the dependencies and continues to #start() once done
  212. load();
  213. }
  214. /**
  215. * Inspect the client to see what it's capable of, this
  216. * should only happens once per runtime.
  217. */
  218. function checkCapabilities() {
  219. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  220. 'MozPerspective' in document.body.style ||
  221. 'msPerspective' in document.body.style ||
  222. 'OPerspective' in document.body.style ||
  223. 'perspective' in document.body.style;
  224. features.transforms2d = 'WebkitTransform' in document.body.style ||
  225. 'MozTransform' in document.body.style ||
  226. 'msTransform' in document.body.style ||
  227. 'OTransform' in document.body.style ||
  228. 'transform' in document.body.style;
  229. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  230. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  231. features.canvas = !!document.createElement( 'canvas' ).getContext;
  232. features.touch = !!( 'ontouchstart' in window );
  233. // Transitions in the overview are disabled in desktop and
  234. // mobile Safari due to lag
  235. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent );
  236. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent );
  237. }
  238. /**
  239. * Loads the dependencies of reveal.js. Dependencies are
  240. * defined via the configuration option 'dependencies'
  241. * and will be loaded prior to starting/binding reveal.js.
  242. * Some dependencies may have an 'async' flag, if so they
  243. * will load after reveal.js has been started up.
  244. */
  245. function load() {
  246. var scripts = [],
  247. scriptsAsync = [],
  248. scriptsToPreload = 0;
  249. // Called once synchronous scripts finish loading
  250. function proceed() {
  251. if( scriptsAsync.length ) {
  252. // Load asynchronous scripts
  253. head.js.apply( null, scriptsAsync );
  254. }
  255. start();
  256. }
  257. function loadScript( s ) {
  258. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  259. // Extension may contain callback functions
  260. if( typeof s.callback === 'function' ) {
  261. s.callback.apply( this );
  262. }
  263. if( --scriptsToPreload === 0 ) {
  264. proceed();
  265. }
  266. });
  267. }
  268. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  269. var s = config.dependencies[i];
  270. // Load if there's no condition or the condition is truthy
  271. if( !s.condition || s.condition() ) {
  272. if( s.async ) {
  273. scriptsAsync.push( s.src );
  274. }
  275. else {
  276. scripts.push( s.src );
  277. }
  278. loadScript( s );
  279. }
  280. }
  281. if( scripts.length ) {
  282. scriptsToPreload = scripts.length;
  283. // Load synchronous scripts
  284. head.js.apply( null, scripts );
  285. }
  286. else {
  287. proceed();
  288. }
  289. }
  290. /**
  291. * Starts up reveal.js by binding input events and navigating
  292. * to the current URL deeplink if there is one.
  293. */
  294. function start() {
  295. // Make sure we've got all the DOM elements we need
  296. setupDOM();
  297. // Listen to messages posted to this window
  298. setupPostMessage();
  299. // Prevent iframes from scrolling the slides out of view
  300. setupIframeScrollPrevention();
  301. // Resets all vertical slides so that only the first is visible
  302. resetVerticalSlides();
  303. // Updates the presentation to match the current configuration values
  304. configure();
  305. // Read the initial hash
  306. readURL();
  307. // Update all backgrounds
  308. updateBackground( true );
  309. // Notify listeners that the presentation is ready but use a 1ms
  310. // timeout to ensure it's not fired synchronously after #initialize()
  311. setTimeout( function() {
  312. // Enable transitions now that we're loaded
  313. dom.slides.classList.remove( 'no-transition' );
  314. loaded = true;
  315. dispatchEvent( 'ready', {
  316. 'indexh': indexh,
  317. 'indexv': indexv,
  318. 'currentSlide': currentSlide
  319. } );
  320. }, 1 );
  321. // Special setup and config is required when printing to PDF
  322. if( isPrintingPDF() ) {
  323. removeEventListeners();
  324. // The document needs to have loaded for the PDF layout
  325. // measurements to be accurate
  326. if( document.readyState === 'complete' ) {
  327. setupPDF();
  328. }
  329. else {
  330. window.addEventListener( 'load', setupPDF );
  331. }
  332. }
  333. }
  334. /**
  335. * Finds and stores references to DOM elements which are
  336. * required by the presentation. If a required element is
  337. * not found, it is created.
  338. */
  339. function setupDOM() {
  340. // Prevent transitions while we're loading
  341. dom.slides.classList.add( 'no-transition' );
  342. // Background element
  343. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  344. // Progress bar
  345. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  346. dom.progressbar = dom.progress.querySelector( 'span' );
  347. // Arrow controls
  348. createSingletonNode( dom.wrapper, 'aside', 'controls',
  349. '<button class="navigate-left" aria-label="previous slide"></button>' +
  350. '<button class="navigate-right" aria-label="next slide"></button>' +
  351. '<button class="navigate-up" aria-label="above slide"></button>' +
  352. '<button class="navigate-down" aria-label="below slide"></button>' );
  353. // Slide number
  354. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  355. // Element containing notes that are visible to the audience
  356. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  357. // Overlay graphic which is displayed during the paused mode
  358. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  359. // Cache references to elements
  360. dom.controls = document.querySelector( '.reveal .controls' );
  361. dom.theme = document.querySelector( '#theme' );
  362. dom.wrapper.setAttribute( 'role', 'application' );
  363. // There can be multiple instances of controls throughout the page
  364. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  365. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  366. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  367. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  368. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  369. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  370. dom.statusDiv = createStatusDiv();
  371. }
  372. /**
  373. * Creates a hidden div with role aria-live to announce the
  374. * current slide content. Hide the div off-screen to make it
  375. * available only to Assistive Technologies.
  376. */
  377. function createStatusDiv() {
  378. var statusDiv = document.getElementById( 'aria-status-div' );
  379. if( !statusDiv ) {
  380. statusDiv = document.createElement( 'div' );
  381. statusDiv.style.position = 'absolute';
  382. statusDiv.style.height = '1px';
  383. statusDiv.style.width = '1px';
  384. statusDiv.style.overflow ='hidden';
  385. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  386. statusDiv.setAttribute( 'id', 'aria-status-div' );
  387. statusDiv.setAttribute( 'aria-live', 'polite' );
  388. statusDiv.setAttribute( 'aria-atomic','true' );
  389. dom.wrapper.appendChild( statusDiv );
  390. }
  391. return statusDiv;
  392. }
  393. /**
  394. * Configures the presentation for printing to a static
  395. * PDF.
  396. */
  397. function setupPDF() {
  398. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  399. // Dimensions of the PDF pages
  400. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  401. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  402. // Dimensions of slides within the pages
  403. var slideWidth = slideSize.width,
  404. slideHeight = slideSize.height;
  405. // Let the browser know what page size we want to print
  406. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  407. // Limit the size of certain elements to the dimensions of the slide
  408. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  409. document.body.classList.add( 'print-pdf' );
  410. document.body.style.width = pageWidth + 'px';
  411. document.body.style.height = pageHeight + 'px';
  412. // Slide and slide background layout
  413. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  414. // Vertical stacks are not centred since their section
  415. // children will be
  416. if( slide.classList.contains( 'stack' ) === false ) {
  417. // Center the slide inside of the page, giving the slide some margin
  418. var left = ( pageWidth - slideWidth ) / 2,
  419. top = ( pageHeight - slideHeight ) / 2;
  420. var contentHeight = getAbsoluteHeight( slide );
  421. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  422. // Center slides vertically
  423. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  424. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  425. }
  426. // Position the slide inside of the page
  427. slide.style.left = left + 'px';
  428. slide.style.top = top + 'px';
  429. slide.style.width = slideWidth + 'px';
  430. // TODO Backgrounds need to be multiplied when the slide
  431. // stretches over multiple pages
  432. var background = slide.querySelector( '.slide-background' );
  433. if( background ) {
  434. background.style.width = pageWidth + 'px';
  435. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  436. background.style.top = -top + 'px';
  437. background.style.left = -left + 'px';
  438. }
  439. }
  440. } );
  441. // Show all fragments
  442. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  443. fragment.classList.add( 'visible' );
  444. } );
  445. }
  446. /**
  447. * This is an unfortunate necessity. Iframes can trigger the
  448. * parent window to scroll, for example by focusing an input.
  449. * This scrolling can not be prevented by hiding overflow in
  450. * CSS so we have to resort to repeatedly checking if the
  451. * browser has decided to offset our slides :(
  452. */
  453. function setupIframeScrollPrevention() {
  454. if( dom.slides.querySelector( 'iframe' ) ) {
  455. setInterval( function() {
  456. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  457. dom.wrapper.scrollTop = 0;
  458. dom.wrapper.scrollLeft = 0;
  459. }
  460. }, 500 );
  461. }
  462. }
  463. /**
  464. * Creates an HTML element and returns a reference to it.
  465. * If the element already exists the existing instance will
  466. * be returned.
  467. */
  468. function createSingletonNode( container, tagname, classname, innerHTML ) {
  469. // Find all nodes matching the description
  470. var nodes = container.querySelectorAll( '.' + classname );
  471. // Check all matches to find one which is a direct child of
  472. // the specified container
  473. for( var i = 0; i < nodes.length; i++ ) {
  474. var testNode = nodes[i];
  475. if( testNode.parentNode === container ) {
  476. return testNode;
  477. }
  478. }
  479. // If no node was found, create it now
  480. var node = document.createElement( tagname );
  481. node.classList.add( classname );
  482. if( typeof innerHTML === 'string' ) {
  483. node.innerHTML = innerHTML;
  484. }
  485. container.appendChild( node );
  486. return node;
  487. }
  488. /**
  489. * Creates the slide background elements and appends them
  490. * to the background container. One element is created per
  491. * slide no matter if the given slide has visible background.
  492. */
  493. function createBackgrounds() {
  494. var printMode = isPrintingPDF();
  495. // Clear prior backgrounds
  496. dom.background.innerHTML = '';
  497. dom.background.classList.add( 'no-transition' );
  498. // Iterate over all horizontal slides
  499. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  500. var backgroundStack;
  501. if( printMode ) {
  502. backgroundStack = createBackground( slideh, slideh );
  503. }
  504. else {
  505. backgroundStack = createBackground( slideh, dom.background );
  506. }
  507. // Iterate over all vertical slides
  508. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  509. if( printMode ) {
  510. createBackground( slidev, slidev );
  511. }
  512. else {
  513. createBackground( slidev, backgroundStack );
  514. }
  515. backgroundStack.classList.add( 'stack' );
  516. } );
  517. } );
  518. // Add parallax background if specified
  519. if( config.parallaxBackgroundImage ) {
  520. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  521. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  522. // Make sure the below properties are set on the element - these properties are
  523. // needed for proper transitions to be set on the element via CSS. To remove
  524. // annoying background slide-in effect when the presentation starts, apply
  525. // these properties after short time delay
  526. setTimeout( function() {
  527. dom.wrapper.classList.add( 'has-parallax-background' );
  528. }, 1 );
  529. }
  530. else {
  531. dom.background.style.backgroundImage = '';
  532. dom.wrapper.classList.remove( 'has-parallax-background' );
  533. }
  534. }
  535. /**
  536. * Creates a background for the given slide.
  537. *
  538. * @param {HTMLElement} slide
  539. * @param {HTMLElement} container The element that the background
  540. * should be appended to
  541. */
  542. function createBackground( slide, container ) {
  543. var data = {
  544. background: slide.getAttribute( 'data-background' ),
  545. backgroundSize: slide.getAttribute( 'data-background-size' ),
  546. backgroundImage: slide.getAttribute( 'data-background-image' ),
  547. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  548. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  549. backgroundColor: slide.getAttribute( 'data-background-color' ),
  550. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  551. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  552. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  553. };
  554. var element = document.createElement( 'div' );
  555. // Carry over custom classes from the slide to the background
  556. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  557. if( data.background ) {
  558. // Auto-wrap image urls in url(...)
  559. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  560. slide.setAttribute( 'data-background-image', data.background );
  561. }
  562. else {
  563. element.style.background = data.background;
  564. }
  565. }
  566. // Create a hash for this combination of background settings.
  567. // This is used to determine when two slide backgrounds are
  568. // the same.
  569. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  570. element.setAttribute( 'data-background-hash', data.background +
  571. data.backgroundSize +
  572. data.backgroundImage +
  573. data.backgroundVideo +
  574. data.backgroundIframe +
  575. data.backgroundColor +
  576. data.backgroundRepeat +
  577. data.backgroundPosition +
  578. data.backgroundTransition );
  579. }
  580. // Additional and optional background properties
  581. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  582. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  583. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  584. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  585. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  586. container.appendChild( element );
  587. // If backgrounds are being recreated, clear old classes
  588. slide.classList.remove( 'has-dark-background' );
  589. slide.classList.remove( 'has-light-background' );
  590. // If this slide has a background color, add a class that
  591. // signals if it is light or dark. If the slide has no background
  592. // color, no class will be set
  593. var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
  594. if( computedBackgroundColor ) {
  595. var rgb = colorToRgb( computedBackgroundColor );
  596. // Ignore fully transparent backgrounds. Some browsers return
  597. // rgba(0,0,0,0) when reading the computed background color of
  598. // an element with no background
  599. if( rgb && rgb.a !== 0 ) {
  600. if( colorBrightness( computedBackgroundColor ) < 128 ) {
  601. slide.classList.add( 'has-dark-background' );
  602. }
  603. else {
  604. slide.classList.add( 'has-light-background' );
  605. }
  606. }
  607. }
  608. return element;
  609. }
  610. /**
  611. * Registers a listener to postMessage events, this makes it
  612. * possible to call all reveal.js API methods from another
  613. * window. For example:
  614. *
  615. * revealWindow.postMessage( JSON.stringify({
  616. * method: 'slide',
  617. * args: [ 2 ]
  618. * }), '*' );
  619. */
  620. function setupPostMessage() {
  621. if( config.postMessage ) {
  622. window.addEventListener( 'message', function ( event ) {
  623. var data = event.data;
  624. // Make sure we're dealing with JSON
  625. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  626. data = JSON.parse( data );
  627. // Check if the requested method can be found
  628. if( data.method && typeof Reveal[data.method] === 'function' ) {
  629. Reveal[data.method].apply( Reveal, data.args );
  630. }
  631. }
  632. }, false );
  633. }
  634. }
  635. /**
  636. * Applies the configuration settings from the config
  637. * object. May be called multiple times.
  638. */
  639. function configure( options ) {
  640. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  641. dom.wrapper.classList.remove( config.transition );
  642. // New config options may be passed when this method
  643. // is invoked through the API after initialization
  644. if( typeof options === 'object' ) extend( config, options );
  645. // Force linear transition based on browser capabilities
  646. if( features.transforms3d === false ) config.transition = 'linear';
  647. dom.wrapper.classList.add( config.transition );
  648. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  649. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  650. dom.controls.style.display = config.controls ? 'block' : 'none';
  651. dom.progress.style.display = config.progress ? 'block' : 'none';
  652. if( config.rtl ) {
  653. dom.wrapper.classList.add( 'rtl' );
  654. }
  655. else {
  656. dom.wrapper.classList.remove( 'rtl' );
  657. }
  658. if( config.center ) {
  659. dom.wrapper.classList.add( 'center' );
  660. }
  661. else {
  662. dom.wrapper.classList.remove( 'center' );
  663. }
  664. // Exit the paused mode if it was configured off
  665. if( config.pause === false ) {
  666. resume();
  667. }
  668. if( config.showNotes ) {
  669. dom.speakerNotes.classList.add( 'visible' );
  670. }
  671. else {
  672. dom.speakerNotes.classList.remove( 'visible' );
  673. }
  674. if( config.mouseWheel ) {
  675. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  676. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  677. }
  678. else {
  679. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  680. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  681. }
  682. // Rolling 3D links
  683. if( config.rollingLinks ) {
  684. enableRollingLinks();
  685. }
  686. else {
  687. disableRollingLinks();
  688. }
  689. // Iframe link previews
  690. if( config.previewLinks ) {
  691. enablePreviewLinks();
  692. }
  693. else {
  694. disablePreviewLinks();
  695. enablePreviewLinks( '[data-preview-link]' );
  696. }
  697. // Remove existing auto-slide controls
  698. if( autoSlidePlayer ) {
  699. autoSlidePlayer.destroy();
  700. autoSlidePlayer = null;
  701. }
  702. // Generate auto-slide controls if needed
  703. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  704. autoSlidePlayer = new Playback( dom.wrapper, function() {
  705. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  706. } );
  707. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  708. autoSlidePaused = false;
  709. }
  710. // When fragments are turned off they should be visible
  711. if( config.fragments === false ) {
  712. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  713. element.classList.add( 'visible' );
  714. element.classList.remove( 'current-fragment' );
  715. } );
  716. }
  717. sync();
  718. }
  719. /**
  720. * Binds all event listeners.
  721. */
  722. function addEventListeners() {
  723. eventsAreBound = true;
  724. window.addEventListener( 'hashchange', onWindowHashChange, false );
  725. window.addEventListener( 'resize', onWindowResize, false );
  726. if( config.touch ) {
  727. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  728. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  729. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  730. // Support pointer-style touch interaction as well
  731. if( window.navigator.pointerEnabled ) {
  732. // IE 11 uses un-prefixed version of pointer events
  733. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  734. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  735. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  736. }
  737. else if( window.navigator.msPointerEnabled ) {
  738. // IE 10 uses prefixed version of pointer events
  739. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  740. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  741. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  742. }
  743. }
  744. if( config.keyboard ) {
  745. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  746. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  747. }
  748. if( config.progress && dom.progress ) {
  749. dom.progress.addEventListener( 'click', onProgressClicked, false );
  750. }
  751. if( config.focusBodyOnPageVisibilityChange ) {
  752. var visibilityChange;
  753. if( 'hidden' in document ) {
  754. visibilityChange = 'visibilitychange';
  755. }
  756. else if( 'msHidden' in document ) {
  757. visibilityChange = 'msvisibilitychange';
  758. }
  759. else if( 'webkitHidden' in document ) {
  760. visibilityChange = 'webkitvisibilitychange';
  761. }
  762. if( visibilityChange ) {
  763. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  764. }
  765. }
  766. // Listen to both touch and click events, in case the device
  767. // supports both
  768. var pointerEvents = [ 'touchstart', 'click' ];
  769. // Only support touch for Android, fixes double navigations in
  770. // stock browser
  771. if( navigator.userAgent.match( /android/gi ) ) {
  772. pointerEvents = [ 'touchstart' ];
  773. }
  774. pointerEvents.forEach( function( eventName ) {
  775. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  776. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  777. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  778. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  779. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  780. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  781. } );
  782. }
  783. /**
  784. * Unbinds all event listeners.
  785. */
  786. function removeEventListeners() {
  787. eventsAreBound = false;
  788. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  789. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  790. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  791. window.removeEventListener( 'resize', onWindowResize, false );
  792. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  793. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  794. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  795. // IE11
  796. if( window.navigator.pointerEnabled ) {
  797. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  798. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  799. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  800. }
  801. // IE10
  802. else if( window.navigator.msPointerEnabled ) {
  803. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  804. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  805. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  806. }
  807. if ( config.progress && dom.progress ) {
  808. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  809. }
  810. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  811. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  812. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  813. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  814. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  815. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  816. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  817. } );
  818. }
  819. /**
  820. * Extend object a with the properties of object b.
  821. * If there's a conflict, object b takes precedence.
  822. */
  823. function extend( a, b ) {
  824. for( var i in b ) {
  825. a[ i ] = b[ i ];
  826. }
  827. }
  828. /**
  829. * Converts the target object to an array.
  830. */
  831. function toArray( o ) {
  832. return Array.prototype.slice.call( o );
  833. }
  834. /**
  835. * Utility for deserializing a value.
  836. */
  837. function deserialize( value ) {
  838. if( typeof value === 'string' ) {
  839. if( value === 'null' ) return null;
  840. else if( value === 'true' ) return true;
  841. else if( value === 'false' ) return false;
  842. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  843. }
  844. return value;
  845. }
  846. /**
  847. * Measures the distance in pixels between point a
  848. * and point b.
  849. *
  850. * @param {Object} a point with x/y properties
  851. * @param {Object} b point with x/y properties
  852. */
  853. function distanceBetween( a, b ) {
  854. var dx = a.x - b.x,
  855. dy = a.y - b.y;
  856. return Math.sqrt( dx*dx + dy*dy );
  857. }
  858. /**
  859. * Applies a CSS transform to the target element.
  860. */
  861. function transformElement( element, transform ) {
  862. element.style.WebkitTransform = transform;
  863. element.style.MozTransform = transform;
  864. element.style.msTransform = transform;
  865. element.style.transform = transform;
  866. }
  867. /**
  868. * Applies CSS transforms to the slides container. The container
  869. * is transformed from two separate sources: layout and the overview
  870. * mode.
  871. */
  872. function transformSlides( transforms ) {
  873. // Pick up new transforms from arguments
  874. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  875. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  876. // Apply the transforms to the slides container
  877. if( slidesTransform.layout ) {
  878. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  879. }
  880. else {
  881. transformElement( dom.slides, slidesTransform.overview );
  882. }
  883. }
  884. /**
  885. * Injects the given CSS styles into the DOM.
  886. */
  887. function injectStyleSheet( value ) {
  888. var tag = document.createElement( 'style' );
  889. tag.type = 'text/css';
  890. if( tag.styleSheet ) {
  891. tag.styleSheet.cssText = value;
  892. }
  893. else {
  894. tag.appendChild( document.createTextNode( value ) );
  895. }
  896. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  897. }
  898. /**
  899. * Converts various color input formats to an {r:0,g:0,b:0} object.
  900. *
  901. * @param {String} color The string representation of a color,
  902. * the following formats are supported:
  903. * - #000
  904. * - #000000
  905. * - rgb(0,0,0)
  906. */
  907. function colorToRgb( color ) {
  908. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  909. if( hex3 && hex3[1] ) {
  910. hex3 = hex3[1];
  911. return {
  912. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  913. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  914. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  915. };
  916. }
  917. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  918. if( hex6 && hex6[1] ) {
  919. hex6 = hex6[1];
  920. return {
  921. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  922. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  923. b: parseInt( hex6.substr( 4, 2 ), 16 )
  924. };
  925. }
  926. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  927. if( rgb ) {
  928. return {
  929. r: parseInt( rgb[1], 10 ),
  930. g: parseInt( rgb[2], 10 ),
  931. b: parseInt( rgb[3], 10 )
  932. };
  933. }
  934. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  935. if( rgba ) {
  936. return {
  937. r: parseInt( rgba[1], 10 ),
  938. g: parseInt( rgba[2], 10 ),
  939. b: parseInt( rgba[3], 10 ),
  940. a: parseFloat( rgba[4] )
  941. };
  942. }
  943. return null;
  944. }
  945. /**
  946. * Calculates brightness on a scale of 0-255.
  947. *
  948. * @param color See colorStringToRgb for supported formats.
  949. */
  950. function colorBrightness( color ) {
  951. if( typeof color === 'string' ) color = colorToRgb( color );
  952. if( color ) {
  953. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  954. }
  955. return null;
  956. }
  957. /**
  958. * Retrieves the height of the given element by looking
  959. * at the position and height of its immediate children.
  960. */
  961. function getAbsoluteHeight( element ) {
  962. var height = 0;
  963. if( element ) {
  964. var absoluteChildren = 0;
  965. toArray( element.childNodes ).forEach( function( child ) {
  966. if( typeof child.offsetTop === 'number' && child.style ) {
  967. // Count # of abs children
  968. if( window.getComputedStyle( child ).position === 'absolute' ) {
  969. absoluteChildren += 1;
  970. }
  971. height = Math.max( height, child.offsetTop + child.offsetHeight );
  972. }
  973. } );
  974. // If there are no absolute children, use offsetHeight
  975. if( absoluteChildren === 0 ) {
  976. height = element.offsetHeight;
  977. }
  978. }
  979. return height;
  980. }
  981. /**
  982. * Returns the remaining height within the parent of the
  983. * target element.
  984. *
  985. * remaining height = [ configured parent height ] - [ current parent height ]
  986. */
  987. function getRemainingHeight( element, height ) {
  988. height = height || 0;
  989. if( element ) {
  990. var newHeight, oldHeight = element.style.height;
  991. // Change the .stretch element height to 0 in order find the height of all
  992. // the other elements
  993. element.style.height = '0px';
  994. newHeight = height - element.parentNode.offsetHeight;
  995. // Restore the old height, just in case
  996. element.style.height = oldHeight + 'px';
  997. return newHeight;
  998. }
  999. return height;
  1000. }
  1001. /**
  1002. * Checks if this instance is being used to print a PDF.
  1003. */
  1004. function isPrintingPDF() {
  1005. return ( /print-pdf/gi ).test( window.location.search );
  1006. }
  1007. /**
  1008. * Hides the address bar if we're on a mobile device.
  1009. */
  1010. function hideAddressBar() {
  1011. if( config.hideAddressBar && isMobileDevice ) {
  1012. // Events that should trigger the address bar to hide
  1013. window.addEventListener( 'load', removeAddressBar, false );
  1014. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1015. }
  1016. }
  1017. /**
  1018. * Causes the address bar to hide on mobile devices,
  1019. * more vertical space ftw.
  1020. */
  1021. function removeAddressBar() {
  1022. setTimeout( function() {
  1023. window.scrollTo( 0, 1 );
  1024. }, 10 );
  1025. }
  1026. /**
  1027. * Dispatches an event of the specified type from the
  1028. * reveal DOM element.
  1029. */
  1030. function dispatchEvent( type, args ) {
  1031. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1032. event.initEvent( type, true, true );
  1033. extend( event, args );
  1034. dom.wrapper.dispatchEvent( event );
  1035. // If we're in an iframe, post each reveal.js event to the
  1036. // parent window. Used by the notes plugin
  1037. if( config.postMessageEvents && window.parent !== window.self ) {
  1038. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1039. }
  1040. }
  1041. /**
  1042. * Wrap all links in 3D goodness.
  1043. */
  1044. function enableRollingLinks() {
  1045. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1046. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1047. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1048. var anchor = anchors[i];
  1049. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1050. var span = document.createElement('span');
  1051. span.setAttribute('data-title', anchor.text);
  1052. span.innerHTML = anchor.innerHTML;
  1053. anchor.classList.add( 'roll' );
  1054. anchor.innerHTML = '';
  1055. anchor.appendChild(span);
  1056. }
  1057. }
  1058. }
  1059. }
  1060. /**
  1061. * Unwrap all 3D links.
  1062. */
  1063. function disableRollingLinks() {
  1064. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1065. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1066. var anchor = anchors[i];
  1067. var span = anchor.querySelector( 'span' );
  1068. if( span ) {
  1069. anchor.classList.remove( 'roll' );
  1070. anchor.innerHTML = span.innerHTML;
  1071. }
  1072. }
  1073. }
  1074. /**
  1075. * Bind preview frame links.
  1076. */
  1077. function enablePreviewLinks( selector ) {
  1078. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1079. anchors.forEach( function( element ) {
  1080. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1081. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1082. }
  1083. } );
  1084. }
  1085. /**
  1086. * Unbind preview frame links.
  1087. */
  1088. function disablePreviewLinks() {
  1089. var anchors = toArray( document.querySelectorAll( 'a' ) );
  1090. anchors.forEach( function( element ) {
  1091. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1092. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1093. }
  1094. } );
  1095. }
  1096. /**
  1097. * Opens a preview window for the target URL.
  1098. */
  1099. function showPreview( url ) {
  1100. closeOverlay();
  1101. dom.overlay = document.createElement( 'div' );
  1102. dom.overlay.classList.add( 'overlay' );
  1103. dom.overlay.classList.add( 'overlay-preview' );
  1104. dom.wrapper.appendChild( dom.overlay );
  1105. dom.overlay.innerHTML = [
  1106. '<header>',
  1107. '<a class="close" href="#"><span class="icon"></span></a>',
  1108. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1109. '</header>',
  1110. '<div class="spinner"></div>',
  1111. '<div class="viewport">',
  1112. '<iframe src="'+ url +'"></iframe>',
  1113. '</div>'
  1114. ].join('');
  1115. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1116. dom.overlay.classList.add( 'loaded' );
  1117. }, false );
  1118. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1119. closeOverlay();
  1120. event.preventDefault();
  1121. }, false );
  1122. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1123. closeOverlay();
  1124. }, false );
  1125. setTimeout( function() {
  1126. dom.overlay.classList.add( 'visible' );
  1127. }, 1 );
  1128. }
  1129. /**
  1130. * Opens a overlay window with help material.
  1131. */
  1132. function showHelp() {
  1133. if( config.help ) {
  1134. closeOverlay();
  1135. dom.overlay = document.createElement( 'div' );
  1136. dom.overlay.classList.add( 'overlay' );
  1137. dom.overlay.classList.add( 'overlay-help' );
  1138. dom.wrapper.appendChild( dom.overlay );
  1139. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1140. html += '<table><th>KEY</th><th>ACTION</th>';
  1141. for( var key in keyboardShortcuts ) {
  1142. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1143. }
  1144. html += '</table>';
  1145. dom.overlay.innerHTML = [
  1146. '<header>',
  1147. '<a class="close" href="#"><span class="icon"></span></a>',
  1148. '</header>',
  1149. '<div class="viewport">',
  1150. '<div class="viewport-inner">'+ html +'</div>',
  1151. '</div>'
  1152. ].join('');
  1153. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1154. closeOverlay();
  1155. event.preventDefault();
  1156. }, false );
  1157. setTimeout( function() {
  1158. dom.overlay.classList.add( 'visible' );
  1159. }, 1 );
  1160. }
  1161. }
  1162. /**
  1163. * Closes any currently open overlay.
  1164. */
  1165. function closeOverlay() {
  1166. if( dom.overlay ) {
  1167. dom.overlay.parentNode.removeChild( dom.overlay );
  1168. dom.overlay = null;
  1169. }
  1170. }
  1171. /**
  1172. * Applies JavaScript-controlled layout rules to the
  1173. * presentation.
  1174. */
  1175. function layout() {
  1176. if( dom.wrapper && !isPrintingPDF() ) {
  1177. var size = getComputedSlideSize();
  1178. var slidePadding = 20; // TODO Dig this out of DOM
  1179. // Layout the contents of the slides
  1180. layoutSlideContents( config.width, config.height, slidePadding );
  1181. dom.slides.style.width = size.width + 'px';
  1182. dom.slides.style.height = size.height + 'px';
  1183. // Determine scale of content to fit within available space
  1184. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1185. // Respect max/min scale settings
  1186. scale = Math.max( scale, config.minScale );
  1187. scale = Math.min( scale, config.maxScale );
  1188. // Don't apply any scaling styles if scale is 1
  1189. if( scale === 1 ) {
  1190. dom.slides.style.zoom = '';
  1191. dom.slides.style.left = '';
  1192. dom.slides.style.top = '';
  1193. dom.slides.style.bottom = '';
  1194. dom.slides.style.right = '';
  1195. transformSlides( { layout: '' } );
  1196. }
  1197. else {
  1198. // Use zoom to scale up in desktop Chrome so that content
  1199. // remains crisp. We don't use zoom to scale down since that
  1200. // can lead to shifts in text layout/line breaks.
  1201. if( scale > 1 && !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  1202. dom.slides.style.zoom = scale;
  1203. dom.slides.style.left = '';
  1204. dom.slides.style.top = '';
  1205. dom.slides.style.bottom = '';
  1206. dom.slides.style.right = '';
  1207. transformSlides( { layout: '' } );
  1208. }
  1209. // Apply scale transform as a fallback
  1210. else {
  1211. dom.slides.style.zoom = '';
  1212. dom.slides.style.left = '50%';
  1213. dom.slides.style.top = '50%';
  1214. dom.slides.style.bottom = 'auto';
  1215. dom.slides.style.right = 'auto';
  1216. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1217. }
  1218. }
  1219. // Select all slides, vertical and horizontal
  1220. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1221. for( var i = 0, len = slides.length; i < len; i++ ) {
  1222. var slide = slides[ i ];
  1223. // Don't bother updating invisible slides
  1224. if( slide.style.display === 'none' ) {
  1225. continue;
  1226. }
  1227. if( config.center || slide.classList.contains( 'center' ) ) {
  1228. // Vertical stacks are not centred since their section
  1229. // children will be
  1230. if( slide.classList.contains( 'stack' ) ) {
  1231. slide.style.top = 0;
  1232. }
  1233. else {
  1234. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  1235. }
  1236. }
  1237. else {
  1238. slide.style.top = '';
  1239. }
  1240. }
  1241. updateProgress();
  1242. updateParallax();
  1243. }
  1244. }
  1245. /**
  1246. * Applies layout logic to the contents of all slides in
  1247. * the presentation.
  1248. */
  1249. function layoutSlideContents( width, height, padding ) {
  1250. // Handle sizing of elements with the 'stretch' class
  1251. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1252. // Determine how much vertical space we can use
  1253. var remainingHeight = getRemainingHeight( element, height );
  1254. // Consider the aspect ratio of media elements
  1255. if( /(img|video)/gi.test( element.nodeName ) ) {
  1256. var nw = element.naturalWidth || element.videoWidth,
  1257. nh = element.naturalHeight || element.videoHeight;
  1258. var es = Math.min( width / nw, remainingHeight / nh );
  1259. element.style.width = ( nw * es ) + 'px';
  1260. element.style.height = ( nh * es ) + 'px';
  1261. }
  1262. else {
  1263. element.style.width = width + 'px';
  1264. element.style.height = remainingHeight + 'px';
  1265. }
  1266. } );
  1267. }
  1268. /**
  1269. * Calculates the computed pixel size of our slides. These
  1270. * values are based on the width and height configuration
  1271. * options.
  1272. */
  1273. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1274. var size = {
  1275. // Slide size
  1276. width: config.width,
  1277. height: config.height,
  1278. // Presentation size
  1279. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1280. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1281. };
  1282. // Reduce available space by margin
  1283. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1284. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1285. // Slide width may be a percentage of available width
  1286. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1287. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1288. }
  1289. // Slide height may be a percentage of available height
  1290. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1291. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1292. }
  1293. return size;
  1294. }
  1295. /**
  1296. * Stores the vertical index of a stack so that the same
  1297. * vertical slide can be selected when navigating to and
  1298. * from the stack.
  1299. *
  1300. * @param {HTMLElement} stack The vertical stack element
  1301. * @param {int} v Index to memorize
  1302. */
  1303. function setPreviousVerticalIndex( stack, v ) {
  1304. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1305. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1306. }
  1307. }
  1308. /**
  1309. * Retrieves the vertical index which was stored using
  1310. * #setPreviousVerticalIndex() or 0 if no previous index
  1311. * exists.
  1312. *
  1313. * @param {HTMLElement} stack The vertical stack element
  1314. */
  1315. function getPreviousVerticalIndex( stack ) {
  1316. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1317. // Prefer manually defined start-indexv
  1318. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1319. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1320. }
  1321. return 0;
  1322. }
  1323. /**
  1324. * Displays the overview of slides (quick nav) by scaling
  1325. * down and arranging all slide elements.
  1326. */
  1327. function activateOverview() {
  1328. // Only proceed if enabled in config
  1329. if( config.overview && !isOverview() ) {
  1330. overview = true;
  1331. dom.wrapper.classList.add( 'overview' );
  1332. dom.wrapper.classList.remove( 'overview-deactivating' );
  1333. if( features.overviewTransitions ) {
  1334. setTimeout( function() {
  1335. dom.wrapper.classList.add( 'overview-animated' );
  1336. }, 1 );
  1337. }
  1338. // Don't auto-slide while in overview mode
  1339. cancelAutoSlide();
  1340. // Move the backgrounds element into the slide container to
  1341. // that the same scaling is applied
  1342. dom.slides.appendChild( dom.background );
  1343. // Clicking on an overview slide navigates to it
  1344. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1345. if( !slide.classList.contains( 'stack' ) ) {
  1346. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1347. }
  1348. } );
  1349. updateSlidesVisibility();
  1350. layoutOverview();
  1351. updateOverview();
  1352. layout();
  1353. // Notify observers of the overview showing
  1354. dispatchEvent( 'overviewshown', {
  1355. 'indexh': indexh,
  1356. 'indexv': indexv,
  1357. 'currentSlide': currentSlide
  1358. } );
  1359. }
  1360. }
  1361. /**
  1362. * Uses CSS transforms to position all slides in a grid for
  1363. * display inside of the overview mode.
  1364. */
  1365. function layoutOverview() {
  1366. var margin = 70;
  1367. var slideWidth = config.width + margin,
  1368. slideHeight = config.height + margin;
  1369. // Reverse in RTL mode
  1370. if( config.rtl ) {
  1371. slideWidth = -slideWidth;
  1372. }
  1373. // Layout slides
  1374. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1375. hslide.setAttribute( 'data-index-h', h );
  1376. transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
  1377. if( hslide.classList.contains( 'stack' ) ) {
  1378. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1379. vslide.setAttribute( 'data-index-h', h );
  1380. vslide.setAttribute( 'data-index-v', v );
  1381. transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
  1382. } );
  1383. }
  1384. } );
  1385. // Layout slide backgrounds
  1386. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1387. transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
  1388. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1389. transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
  1390. } );
  1391. } );
  1392. }
  1393. /**
  1394. * Moves the overview viewport to the current slides.
  1395. * Called each time the current slide changes.
  1396. */
  1397. function updateOverview() {
  1398. var margin = 70;
  1399. var slideWidth = config.width + margin,
  1400. slideHeight = config.height + margin;
  1401. // Reverse in RTL mode
  1402. if( config.rtl ) {
  1403. slideWidth = -slideWidth;
  1404. }
  1405. transformSlides( {
  1406. overview: [
  1407. 'translateX('+ ( -indexh * slideWidth ) +'px)',
  1408. 'translateY('+ ( -indexv * slideHeight ) +'px)',
  1409. 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
  1410. ].join( ' ' )
  1411. } );
  1412. }
  1413. /**
  1414. * Exits the slide overview and enters the currently
  1415. * active slide.
  1416. */
  1417. function deactivateOverview() {
  1418. // Only proceed if enabled in config
  1419. if( config.overview ) {
  1420. overview = false;
  1421. dom.wrapper.classList.remove( 'overview' );
  1422. dom.wrapper.classList.remove( 'overview-animated' );
  1423. // Temporarily add a class so that transitions can do different things
  1424. // depending on whether they are exiting/entering overview, or just
  1425. // moving from slide to slide
  1426. dom.wrapper.classList.add( 'overview-deactivating' );
  1427. setTimeout( function () {
  1428. dom.wrapper.classList.remove( 'overview-deactivating' );
  1429. }, 1 );
  1430. // Move the background element back out
  1431. dom.wrapper.appendChild( dom.background );
  1432. // Clean up changes made to slides
  1433. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1434. transformElement( slide, '' );
  1435. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1436. } );
  1437. // Clean up changes made to backgrounds
  1438. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1439. transformElement( background, '' );
  1440. } );
  1441. transformSlides( { overview: '' } );
  1442. slide( indexh, indexv );
  1443. layout();
  1444. cueAutoSlide();
  1445. // Notify observers of the overview hiding
  1446. dispatchEvent( 'overviewhidden', {
  1447. 'indexh': indexh,
  1448. 'indexv': indexv,
  1449. 'currentSlide': currentSlide
  1450. } );
  1451. }
  1452. }
  1453. /**
  1454. * Toggles the slide overview mode on and off.
  1455. *
  1456. * @param {Boolean} override Optional flag which overrides the
  1457. * toggle logic and forcibly sets the desired state. True means
  1458. * overview is open, false means it's closed.
  1459. */
  1460. function toggleOverview( override ) {
  1461. if( typeof override === 'boolean' ) {
  1462. override ? activateOverview() : deactivateOverview();
  1463. }
  1464. else {
  1465. isOverview() ? deactivateOverview() : activateOverview();
  1466. }
  1467. }
  1468. /**
  1469. * Checks if the overview is currently active.
  1470. *
  1471. * @return {Boolean} true if the overview is active,
  1472. * false otherwise
  1473. */
  1474. function isOverview() {
  1475. return overview;
  1476. }
  1477. /**
  1478. * Checks if the current or specified slide is vertical
  1479. * (nested within another slide).
  1480. *
  1481. * @param {HTMLElement} slide [optional] The slide to check
  1482. * orientation of
  1483. */
  1484. function isVerticalSlide( slide ) {
  1485. // Prefer slide argument, otherwise use current slide
  1486. slide = slide ? slide : currentSlide;
  1487. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1488. }
  1489. /**
  1490. * Handling the fullscreen functionality via the fullscreen API
  1491. *
  1492. * @see http://fullscreen.spec.whatwg.org/
  1493. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1494. */
  1495. function enterFullscreen() {
  1496. var element = document.body;
  1497. // Check which implementation is available
  1498. var requestMethod = element.requestFullScreen ||
  1499. element.webkitRequestFullscreen ||
  1500. element.webkitRequestFullScreen ||
  1501. element.mozRequestFullScreen ||
  1502. element.msRequestFullscreen;
  1503. if( requestMethod ) {
  1504. requestMethod.apply( element );
  1505. }
  1506. }
  1507. /**
  1508. * Enters the paused mode which fades everything on screen to
  1509. * black.
  1510. */
  1511. function pause() {
  1512. if( config.pause ) {
  1513. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1514. cancelAutoSlide();
  1515. dom.wrapper.classList.add( 'paused' );
  1516. if( wasPaused === false ) {
  1517. dispatchEvent( 'paused' );
  1518. }
  1519. }
  1520. }
  1521. /**
  1522. * Exits from the paused mode.
  1523. */
  1524. function resume() {
  1525. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1526. dom.wrapper.classList.remove( 'paused' );
  1527. cueAutoSlide();
  1528. if( wasPaused ) {
  1529. dispatchEvent( 'resumed' );
  1530. }
  1531. }
  1532. /**
  1533. * Toggles the paused mode on and off.
  1534. */
  1535. function togglePause( override ) {
  1536. if( typeof override === 'boolean' ) {
  1537. override ? pause() : resume();
  1538. }
  1539. else {
  1540. isPaused() ? resume() : pause();
  1541. }
  1542. }
  1543. /**
  1544. * Checks if we are currently in the paused mode.
  1545. */
  1546. function isPaused() {
  1547. return dom.wrapper.classList.contains( 'paused' );
  1548. }
  1549. /**
  1550. * Toggles the auto slide mode on and off.
  1551. *
  1552. * @param {Boolean} override Optional flag which sets the desired state.
  1553. * True means autoplay starts, false means it stops.
  1554. */
  1555. function toggleAutoSlide( override ) {
  1556. if( typeof override === 'boolean' ) {
  1557. override ? resumeAutoSlide() : pauseAutoSlide();
  1558. }
  1559. else {
  1560. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1561. }
  1562. }
  1563. /**
  1564. * Checks if the auto slide mode is currently on.
  1565. */
  1566. function isAutoSliding() {
  1567. return !!( autoSlide && !autoSlidePaused );
  1568. }
  1569. /**
  1570. * Steps from the current point in the presentation to the
  1571. * slide which matches the specified horizontal and vertical
  1572. * indices.
  1573. *
  1574. * @param {int} h Horizontal index of the target slide
  1575. * @param {int} v Vertical index of the target slide
  1576. * @param {int} f Optional index of a fragment within the
  1577. * target slide to activate
  1578. * @param {int} o Optional origin for use in multimaster environments
  1579. */
  1580. function slide( h, v, f, o ) {
  1581. // Remember where we were at before
  1582. previousSlide = currentSlide;
  1583. // Query all horizontal slides in the deck
  1584. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1585. // If no vertical index is specified and the upcoming slide is a
  1586. // stack, resume at its previous vertical index
  1587. if( v === undefined && !isOverview() ) {
  1588. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1589. }
  1590. // If we were on a vertical stack, remember what vertical index
  1591. // it was on so we can resume at the same position when returning
  1592. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1593. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1594. }
  1595. // Remember the state before this slide
  1596. var stateBefore = state.concat();
  1597. // Reset the state array
  1598. state.length = 0;
  1599. var indexhBefore = indexh || 0,
  1600. indexvBefore = indexv || 0;
  1601. // Activate and transition to the new slide
  1602. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1603. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1604. // Update the visibility of slides now that the indices have changed
  1605. updateSlidesVisibility();
  1606. layout();
  1607. // Apply the new state
  1608. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1609. // Check if this state existed on the previous slide. If it
  1610. // did, we will avoid adding it repeatedly
  1611. for( var j = 0; j < stateBefore.length; j++ ) {
  1612. if( stateBefore[j] === state[i] ) {
  1613. stateBefore.splice( j, 1 );
  1614. continue stateLoop;
  1615. }
  1616. }
  1617. document.documentElement.classList.add( state[i] );
  1618. // Dispatch custom event matching the state's name
  1619. dispatchEvent( state[i] );
  1620. }
  1621. // Clean up the remains of the previous state
  1622. while( stateBefore.length ) {
  1623. document.documentElement.classList.remove( stateBefore.pop() );
  1624. }
  1625. // Update the overview if it's currently active
  1626. if( isOverview() ) {
  1627. updateOverview();
  1628. }
  1629. // Find the current horizontal slide and any possible vertical slides
  1630. // within it
  1631. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1632. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1633. // Store references to the previous and current slides
  1634. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1635. // Show fragment, if specified
  1636. if( typeof f !== 'undefined' ) {
  1637. navigateFragment( f );
  1638. }
  1639. // Dispatch an event if the slide changed
  1640. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1641. if( slideChanged ) {
  1642. dispatchEvent( 'slidechanged', {
  1643. 'indexh': indexh,
  1644. 'indexv': indexv,
  1645. 'previousSlide': previousSlide,
  1646. 'currentSlide': currentSlide,
  1647. 'origin': o
  1648. } );
  1649. }
  1650. else {
  1651. // Ensure that the previous slide is never the same as the current
  1652. previousSlide = null;
  1653. }
  1654. // Solves an edge case where the previous slide maintains the
  1655. // 'present' class when navigating between adjacent vertical
  1656. // stacks
  1657. if( previousSlide ) {
  1658. previousSlide.classList.remove( 'present' );
  1659. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1660. // Reset all slides upon navigate to home
  1661. // Issue: #285
  1662. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1663. // Launch async task
  1664. setTimeout( function () {
  1665. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1666. for( i in slides ) {
  1667. if( slides[i] ) {
  1668. // Reset stack
  1669. setPreviousVerticalIndex( slides[i], 0 );
  1670. }
  1671. }
  1672. }, 0 );
  1673. }
  1674. }
  1675. // Handle embedded content
  1676. if( slideChanged || !previousSlide ) {
  1677. stopEmbeddedContent( previousSlide );
  1678. startEmbeddedContent( currentSlide );
  1679. }
  1680. // Announce the current slide contents, for screen readers
  1681. dom.statusDiv.textContent = currentSlide.textContent;
  1682. updateControls();
  1683. updateProgress();
  1684. updateBackground();
  1685. updateParallax();
  1686. updateSlideNumber();
  1687. updateNotes();
  1688. // Update the URL hash
  1689. writeURL();
  1690. cueAutoSlide();
  1691. }
  1692. /**
  1693. * Syncs the presentation with the current DOM. Useful
  1694. * when new slides or control elements are added or when
  1695. * the configuration has changed.
  1696. */
  1697. function sync() {
  1698. // Subscribe to input
  1699. removeEventListeners();
  1700. addEventListeners();
  1701. // Force a layout to make sure the current config is accounted for
  1702. layout();
  1703. // Reflect the current autoSlide value
  1704. autoSlide = config.autoSlide;
  1705. // Start auto-sliding if it's enabled
  1706. cueAutoSlide();
  1707. // Re-create the slide backgrounds
  1708. createBackgrounds();
  1709. // Write the current hash to the URL
  1710. writeURL();
  1711. sortAllFragments();
  1712. updateControls();
  1713. updateProgress();
  1714. updateBackground( true );
  1715. updateSlideNumber();
  1716. updateSlidesVisibility();
  1717. updateNotes();
  1718. formatEmbeddedContent();
  1719. startEmbeddedContent( currentSlide );
  1720. if( isOverview() ) {
  1721. layoutOverview();
  1722. }
  1723. }
  1724. /**
  1725. * Resets all vertical slides so that only the first
  1726. * is visible.
  1727. */
  1728. function resetVerticalSlides() {
  1729. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1730. horizontalSlides.forEach( function( horizontalSlide ) {
  1731. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1732. verticalSlides.forEach( function( verticalSlide, y ) {
  1733. if( y > 0 ) {
  1734. verticalSlide.classList.remove( 'present' );
  1735. verticalSlide.classList.remove( 'past' );
  1736. verticalSlide.classList.add( 'future' );
  1737. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1738. }
  1739. } );
  1740. } );
  1741. }
  1742. /**
  1743. * Sorts and formats all of fragments in the
  1744. * presentation.
  1745. */
  1746. function sortAllFragments() {
  1747. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1748. horizontalSlides.forEach( function( horizontalSlide ) {
  1749. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1750. verticalSlides.forEach( function( verticalSlide, y ) {
  1751. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1752. } );
  1753. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1754. } );
  1755. }
  1756. /**
  1757. * Updates one dimension of slides by showing the slide
  1758. * with the specified index.
  1759. *
  1760. * @param {String} selector A CSS selector that will fetch
  1761. * the group of slides we are working with
  1762. * @param {Number} index The index of the slide that should be
  1763. * shown
  1764. *
  1765. * @return {Number} The index of the slide that is now shown,
  1766. * might differ from the passed in index if it was out of
  1767. * bounds.
  1768. */
  1769. function updateSlides( selector, index ) {
  1770. // Select all slides and convert the NodeList result to
  1771. // an array
  1772. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1773. slidesLength = slides.length;
  1774. var printMode = isPrintingPDF();
  1775. if( slidesLength ) {
  1776. // Should the index loop?
  1777. if( config.loop ) {
  1778. index %= slidesLength;
  1779. if( index < 0 ) {
  1780. index = slidesLength + index;
  1781. }
  1782. }
  1783. // Enforce max and minimum index bounds
  1784. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1785. for( var i = 0; i < slidesLength; i++ ) {
  1786. var element = slides[i];
  1787. var reverse = config.rtl && !isVerticalSlide( element );
  1788. element.classList.remove( 'past' );
  1789. element.classList.remove( 'present' );
  1790. element.classList.remove( 'future' );
  1791. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1792. element.setAttribute( 'hidden', '' );
  1793. element.setAttribute( 'aria-hidden', 'true' );
  1794. // If this element contains vertical slides
  1795. if( element.querySelector( 'section' ) ) {
  1796. element.classList.add( 'stack' );
  1797. }
  1798. // If we're printing static slides, all slides are "present"
  1799. if( printMode ) {
  1800. element.classList.add( 'present' );
  1801. continue;
  1802. }
  1803. if( i < index ) {
  1804. // Any element previous to index is given the 'past' class
  1805. element.classList.add( reverse ? 'future' : 'past' );
  1806. if( config.fragments ) {
  1807. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1808. // Show all fragments on prior slides
  1809. while( pastFragments.length ) {
  1810. var pastFragment = pastFragments.pop();
  1811. pastFragment.classList.add( 'visible' );
  1812. pastFragment.classList.remove( 'current-fragment' );
  1813. }
  1814. }
  1815. }
  1816. else if( i > index ) {
  1817. // Any element subsequent to index is given the 'future' class
  1818. element.classList.add( reverse ? 'past' : 'future' );
  1819. if( config.fragments ) {
  1820. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1821. // No fragments in future slides should be visible ahead of time
  1822. while( futureFragments.length ) {
  1823. var futureFragment = futureFragments.pop();
  1824. futureFragment.classList.remove( 'visible' );
  1825. futureFragment.classList.remove( 'current-fragment' );
  1826. }
  1827. }
  1828. }
  1829. }
  1830. // Mark the current slide as present
  1831. slides[index].classList.add( 'present' );
  1832. slides[index].removeAttribute( 'hidden' );
  1833. slides[index].removeAttribute( 'aria-hidden' );
  1834. // If this slide has a state associated with it, add it
  1835. // onto the current state of the deck
  1836. var slideState = slides[index].getAttribute( 'data-state' );
  1837. if( slideState ) {
  1838. state = state.concat( slideState.split( ' ' ) );
  1839. }
  1840. }
  1841. else {
  1842. // Since there are no slides we can't be anywhere beyond the
  1843. // zeroth index
  1844. index = 0;
  1845. }
  1846. return index;
  1847. }
  1848. /**
  1849. * Optimization method; hide all slides that are far away
  1850. * from the present slide.
  1851. */
  1852. function updateSlidesVisibility() {
  1853. // Select all slides and convert the NodeList result to
  1854. // an array
  1855. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1856. horizontalSlidesLength = horizontalSlides.length,
  1857. distanceX,
  1858. distanceY;
  1859. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1860. // The number of steps away from the present slide that will
  1861. // be visible
  1862. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1863. // Limit view distance on weaker devices
  1864. if( isMobileDevice ) {
  1865. viewDistance = isOverview() ? 6 : 2;
  1866. }
  1867. // All slides need to be visible when exporting to PDF
  1868. if( isPrintingPDF() ) {
  1869. viewDistance = Number.MAX_VALUE;
  1870. }
  1871. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1872. var horizontalSlide = horizontalSlides[x];
  1873. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1874. verticalSlidesLength = verticalSlides.length;
  1875. // Determine how far away this slide is from the present
  1876. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  1877. // If the presentation is looped, distance should measure
  1878. // 1 between the first and last slides
  1879. if( config.loop ) {
  1880. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1881. }
  1882. // Show the horizontal slide if it's within the view distance
  1883. if( distanceX < viewDistance ) {
  1884. showSlide( horizontalSlide );
  1885. }
  1886. else {
  1887. hideSlide( horizontalSlide );
  1888. }
  1889. if( verticalSlidesLength ) {
  1890. var oy = getPreviousVerticalIndex( horizontalSlide );
  1891. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1892. var verticalSlide = verticalSlides[y];
  1893. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1894. if( distanceX + distanceY < viewDistance ) {
  1895. showSlide( verticalSlide );
  1896. }
  1897. else {
  1898. hideSlide( verticalSlide );
  1899. }
  1900. }
  1901. }
  1902. }
  1903. }
  1904. }
  1905. /**
  1906. * Pick up notes from the current slide and display tham
  1907. * to the viewer.
  1908. *
  1909. * @see `showNotes` config value
  1910. */
  1911. function updateNotes() {
  1912. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  1913. dom.speakerNotes.innerHTML = getSlideNotes() || '';
  1914. }
  1915. }
  1916. /**
  1917. * Updates the progress bar to reflect the current slide.
  1918. */
  1919. function updateProgress() {
  1920. // Update progress if enabled
  1921. if( config.progress && dom.progressbar ) {
  1922. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  1923. }
  1924. }
  1925. /**
  1926. * Updates the slide number div to reflect the current slide.
  1927. *
  1928. * Slide number format can be defined as a string using the
  1929. * following variables:
  1930. * h: current slide's horizontal index
  1931. * v: current slide's vertical index
  1932. * c: current slide index (flattened)
  1933. * t: total number of slides (flattened)
  1934. */
  1935. function updateSlideNumber() {
  1936. // Update slide number if enabled
  1937. if( config.slideNumber && dom.slideNumber) {
  1938. // Default to only showing the current slide number
  1939. var format = 'c';
  1940. // Check if a custom slide number format is available
  1941. if( typeof config.slideNumber === 'string' ) {
  1942. format = config.slideNumber;
  1943. }
  1944. dom.slideNumber.innerHTML = format.replace( /h/g, indexh )
  1945. .replace( /v/g, indexv )
  1946. .replace( /c/g, getSlidePastCount() + 1 )
  1947. .replace( /t/g, getTotalSlides() );
  1948. }
  1949. }
  1950. /**
  1951. * Updates the state of all control/navigation arrows.
  1952. */
  1953. function updateControls() {
  1954. var routes = availableRoutes();
  1955. var fragments = availableFragments();
  1956. // Remove the 'enabled' class from all directions
  1957. dom.controlsLeft.concat( dom.controlsRight )
  1958. .concat( dom.controlsUp )
  1959. .concat( dom.controlsDown )
  1960. .concat( dom.controlsPrev )
  1961. .concat( dom.controlsNext ).forEach( function( node ) {
  1962. node.classList.remove( 'enabled' );
  1963. node.classList.remove( 'fragmented' );
  1964. } );
  1965. // Add the 'enabled' class to the available routes
  1966. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1967. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1968. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1969. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1970. // Prev/next buttons
  1971. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1972. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1973. // Highlight fragment directions
  1974. if( currentSlide ) {
  1975. // Always apply fragment decorator to prev/next buttons
  1976. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1977. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1978. // Apply fragment decorators to directional buttons based on
  1979. // what slide axis they are in
  1980. if( isVerticalSlide( currentSlide ) ) {
  1981. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1982. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1983. }
  1984. else {
  1985. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1986. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1987. }
  1988. }
  1989. }
  1990. /**
  1991. * Updates the background elements to reflect the current
  1992. * slide.
  1993. *
  1994. * @param {Boolean} includeAll If true, the backgrounds of
  1995. * all vertical slides (not just the present) will be updated.
  1996. */
  1997. function updateBackground( includeAll ) {
  1998. var currentBackground = null;
  1999. // Reverse past/future classes when in RTL mode
  2000. var horizontalPast = config.rtl ? 'future' : 'past',
  2001. horizontalFuture = config.rtl ? 'past' : 'future';
  2002. // Update the classes of all backgrounds to match the
  2003. // states of their slides (past/present/future)
  2004. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2005. backgroundh.classList.remove( 'past' );
  2006. backgroundh.classList.remove( 'present' );
  2007. backgroundh.classList.remove( 'future' );
  2008. if( h < indexh ) {
  2009. backgroundh.classList.add( horizontalPast );
  2010. }
  2011. else if ( h > indexh ) {
  2012. backgroundh.classList.add( horizontalFuture );
  2013. }
  2014. else {
  2015. backgroundh.classList.add( 'present' );
  2016. // Store a reference to the current background element
  2017. currentBackground = backgroundh;
  2018. }
  2019. if( includeAll || h === indexh ) {
  2020. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2021. backgroundv.classList.remove( 'past' );
  2022. backgroundv.classList.remove( 'present' );
  2023. backgroundv.classList.remove( 'future' );
  2024. if( v < indexv ) {
  2025. backgroundv.classList.add( 'past' );
  2026. }
  2027. else if ( v > indexv ) {
  2028. backgroundv.classList.add( 'future' );
  2029. }
  2030. else {
  2031. backgroundv.classList.add( 'present' );
  2032. // Only if this is the present horizontal and vertical slide
  2033. if( h === indexh ) currentBackground = backgroundv;
  2034. }
  2035. } );
  2036. }
  2037. } );
  2038. // Stop any currently playing video background
  2039. if( previousBackground ) {
  2040. var previousVideo = previousBackground.querySelector( 'video' );
  2041. if( previousVideo ) previousVideo.pause();
  2042. }
  2043. if( currentBackground ) {
  2044. // Start video playback
  2045. var currentVideo = currentBackground.querySelector( 'video' );
  2046. if( currentVideo ) {
  2047. if( currentVideo.currentTime > 0 ) currentVideo.currentTime = 0;
  2048. currentVideo.play();
  2049. }
  2050. var backgroundImageURL = currentBackground.style.backgroundImage || '';
  2051. // Restart GIFs (doesn't work in Firefox)
  2052. if( /\.gif/i.test( backgroundImageURL ) ) {
  2053. currentBackground.style.backgroundImage = '';
  2054. window.getComputedStyle( currentBackground ).opacity;
  2055. currentBackground.style.backgroundImage = backgroundImageURL;
  2056. }
  2057. // Don't transition between identical backgrounds. This
  2058. // prevents unwanted flicker.
  2059. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2060. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2061. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2062. dom.background.classList.add( 'no-transition' );
  2063. }
  2064. previousBackground = currentBackground;
  2065. }
  2066. // If there's a background brightness flag for this slide,
  2067. // bubble it to the .reveal container
  2068. if( currentSlide ) {
  2069. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2070. if( currentSlide.classList.contains( classToBubble ) ) {
  2071. dom.wrapper.classList.add( classToBubble );
  2072. }
  2073. else {
  2074. dom.wrapper.classList.remove( classToBubble );
  2075. }
  2076. } );
  2077. }
  2078. // Allow the first background to apply without transition
  2079. setTimeout( function() {
  2080. dom.background.classList.remove( 'no-transition' );
  2081. }, 1 );
  2082. }
  2083. /**
  2084. * Updates the position of the parallax background based
  2085. * on the current slide index.
  2086. */
  2087. function updateParallax() {
  2088. if( config.parallaxBackgroundImage ) {
  2089. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2090. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2091. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2092. backgroundWidth, backgroundHeight;
  2093. if( backgroundSize.length === 1 ) {
  2094. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2095. }
  2096. else {
  2097. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2098. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2099. }
  2100. var slideWidth = dom.background.offsetWidth,
  2101. horizontalSlideCount = horizontalSlides.length,
  2102. horizontalOffsetMultiplier,
  2103. horizontalOffset;
  2104. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2105. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2106. }
  2107. else {
  2108. horizontalOffsetMultiplier = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 );
  2109. }
  2110. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2111. var slideHeight = dom.background.offsetHeight,
  2112. verticalSlideCount = verticalSlides.length,
  2113. verticalOffsetMultiplier,
  2114. verticalOffset;
  2115. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2116. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2117. }
  2118. else {
  2119. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2120. }
  2121. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0;
  2122. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2123. }
  2124. }
  2125. /**
  2126. * Called when the given slide is within the configured view
  2127. * distance. Shows the slide element and loads any content
  2128. * that is set to load lazily (data-src).
  2129. */
  2130. function showSlide( slide ) {
  2131. // Show the slide element
  2132. slide.style.display = 'block';
  2133. // Media elements with data-src attributes
  2134. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2135. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2136. element.removeAttribute( 'data-src' );
  2137. } );
  2138. // Media elements with <source> children
  2139. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2140. var sources = 0;
  2141. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2142. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2143. source.removeAttribute( 'data-src' );
  2144. sources += 1;
  2145. } );
  2146. // If we rewrote sources for this video/audio element, we need
  2147. // to manually tell it to load from its new origin
  2148. if( sources > 0 ) {
  2149. media.load();
  2150. }
  2151. } );
  2152. // Show the corresponding background element
  2153. var indices = getIndices( slide );
  2154. var background = getSlideBackground( indices.h, indices.v );
  2155. if( background ) {
  2156. background.style.display = 'block';
  2157. // If the background contains media, load it
  2158. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2159. background.setAttribute( 'data-loaded', 'true' );
  2160. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2161. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2162. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2163. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2164. // Images
  2165. if( backgroundImage ) {
  2166. background.style.backgroundImage = 'url('+ backgroundImage +')';
  2167. }
  2168. // Videos
  2169. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2170. var video = document.createElement( 'video' );
  2171. if( backgroundVideoLoop ) {
  2172. video.setAttribute( 'loop', '' );
  2173. }
  2174. // Support comma separated lists of video sources
  2175. backgroundVideo.split( ',' ).forEach( function( source ) {
  2176. video.innerHTML += '<source src="'+ source +'">';
  2177. } );
  2178. background.appendChild( video );
  2179. }
  2180. // Iframes
  2181. else if( backgroundIframe ) {
  2182. var iframe = document.createElement( 'iframe' );
  2183. iframe.setAttribute( 'src', backgroundIframe );
  2184. iframe.style.width = '100%';
  2185. iframe.style.height = '100%';
  2186. iframe.style.maxHeight = '100%';
  2187. iframe.style.maxWidth = '100%';
  2188. background.appendChild( iframe );
  2189. }
  2190. }
  2191. }
  2192. }
  2193. /**
  2194. * Called when the given slide is moved outside of the
  2195. * configured view distance.
  2196. */
  2197. function hideSlide( slide ) {
  2198. // Hide the slide element
  2199. slide.style.display = 'none';
  2200. // Hide the corresponding background element
  2201. var indices = getIndices( slide );
  2202. var background = getSlideBackground( indices.h, indices.v );
  2203. if( background ) {
  2204. background.style.display = 'none';
  2205. }
  2206. }
  2207. /**
  2208. * Determine what available routes there are for navigation.
  2209. *
  2210. * @return {Object} containing four booleans: left/right/up/down
  2211. */
  2212. function availableRoutes() {
  2213. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2214. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2215. var routes = {
  2216. left: indexh > 0 || config.loop,
  2217. right: indexh < horizontalSlides.length - 1 || config.loop,
  2218. up: indexv > 0,
  2219. down: indexv < verticalSlides.length - 1
  2220. };
  2221. // reverse horizontal controls for rtl
  2222. if( config.rtl ) {
  2223. var left = routes.left;
  2224. routes.left = routes.right;
  2225. routes.right = left;
  2226. }
  2227. return routes;
  2228. }
  2229. /**
  2230. * Returns an object describing the available fragment
  2231. * directions.
  2232. *
  2233. * @return {Object} two boolean properties: prev/next
  2234. */
  2235. function availableFragments() {
  2236. if( currentSlide && config.fragments ) {
  2237. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2238. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2239. return {
  2240. prev: fragments.length - hiddenFragments.length > 0,
  2241. next: !!hiddenFragments.length
  2242. };
  2243. }
  2244. else {
  2245. return { prev: false, next: false };
  2246. }
  2247. }
  2248. /**
  2249. * Enforces origin-specific format rules for embedded media.
  2250. */
  2251. function formatEmbeddedContent() {
  2252. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2253. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2254. var src = el.getAttribute( sourceAttribute );
  2255. if( src && src.indexOf( param ) === -1 ) {
  2256. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2257. }
  2258. });
  2259. };
  2260. // YouTube frames must include "?enablejsapi=1"
  2261. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2262. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2263. // Vimeo frames must include "?api=1"
  2264. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2265. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2266. }
  2267. /**
  2268. * Start playback of any embedded content inside of
  2269. * the targeted slide.
  2270. */
  2271. function startEmbeddedContent( slide ) {
  2272. if( slide && !isSpeakerNotes() ) {
  2273. // Restart GIFs
  2274. toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  2275. // Setting the same unchanged source like this was confirmed
  2276. // to work in Chrome, FF & Safari
  2277. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  2278. } );
  2279. // HTML5 media elements
  2280. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2281. if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
  2282. el.play();
  2283. }
  2284. } );
  2285. // Normal iframes
  2286. toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  2287. startEmbeddedIframe( { target: el } );
  2288. } );
  2289. // Lazy loading iframes
  2290. toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2291. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  2292. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  2293. el.addEventListener( 'load', startEmbeddedIframe );
  2294. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  2295. }
  2296. } );
  2297. }
  2298. }
  2299. /**
  2300. * "Starts" the content of an embedded iframe using the
  2301. * postmessage API.
  2302. */
  2303. function startEmbeddedIframe( event ) {
  2304. var iframe = event.target;
  2305. // YouTube postMessage API
  2306. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2307. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2308. }
  2309. // Vimeo postMessage API
  2310. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2311. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  2312. }
  2313. // Generic postMessage API
  2314. else {
  2315. iframe.contentWindow.postMessage( 'slide:start', '*' );
  2316. }
  2317. }
  2318. /**
  2319. * Stop playback of any embedded content inside of
  2320. * the targeted slide.
  2321. */
  2322. function stopEmbeddedContent( slide ) {
  2323. if( slide && slide.parentNode ) {
  2324. // HTML5 media elements
  2325. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2326. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  2327. el.pause();
  2328. }
  2329. } );
  2330. // Generic postMessage API for non-lazy loaded iframes
  2331. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2332. el.contentWindow.postMessage( 'slide:stop', '*' );
  2333. el.removeEventListener( 'load', startEmbeddedIframe );
  2334. });
  2335. // YouTube postMessage API
  2336. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2337. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2338. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2339. }
  2340. });
  2341. // Vimeo postMessage API
  2342. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2343. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2344. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2345. }
  2346. });
  2347. // Lazy loading iframes
  2348. toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2349. // Only removing the src doesn't actually unload the frame
  2350. // in all browsers (Firefox) so we set it to blank first
  2351. el.setAttribute( 'src', 'about:blank' );
  2352. el.removeAttribute( 'src' );
  2353. } );
  2354. }
  2355. }
  2356. /**
  2357. * Returns the number of past slides. This can be used as a global
  2358. * flattened index for slides.
  2359. */
  2360. function getSlidePastCount() {
  2361. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2362. // The number of past slides
  2363. var pastCount = 0;
  2364. // Step through all slides and count the past ones
  2365. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2366. var horizontalSlide = horizontalSlides[i];
  2367. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2368. for( var j = 0; j < verticalSlides.length; j++ ) {
  2369. // Stop as soon as we arrive at the present
  2370. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2371. break mainLoop;
  2372. }
  2373. pastCount++;
  2374. }
  2375. // Stop as soon as we arrive at the present
  2376. if( horizontalSlide.classList.contains( 'present' ) ) {
  2377. break;
  2378. }
  2379. // Don't count the wrapping section for vertical slides
  2380. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2381. pastCount++;
  2382. }
  2383. }
  2384. return pastCount;
  2385. }
  2386. /**
  2387. * Returns a value ranging from 0-1 that represents
  2388. * how far into the presentation we have navigated.
  2389. */
  2390. function getProgress() {
  2391. // The number of past and total slides
  2392. var totalCount = getTotalSlides();
  2393. var pastCount = getSlidePastCount();
  2394. if( currentSlide ) {
  2395. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2396. // If there are fragments in the current slide those should be
  2397. // accounted for in the progress.
  2398. if( allFragments.length > 0 ) {
  2399. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2400. // This value represents how big a portion of the slide progress
  2401. // that is made up by its fragments (0-1)
  2402. var fragmentWeight = 0.9;
  2403. // Add fragment progress to the past slide count
  2404. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2405. }
  2406. }
  2407. return pastCount / ( totalCount - 1 );
  2408. }
  2409. /**
  2410. * Checks if this presentation is running inside of the
  2411. * speaker notes window.
  2412. */
  2413. function isSpeakerNotes() {
  2414. return !!window.location.search.match( /receiver/gi );
  2415. }
  2416. /**
  2417. * Reads the current URL (hash) and navigates accordingly.
  2418. */
  2419. function readURL() {
  2420. var hash = window.location.hash;
  2421. // Attempt to parse the hash as either an index or name
  2422. var bits = hash.slice( 2 ).split( '/' ),
  2423. name = hash.replace( /#|\//gi, '' );
  2424. // If the first bit is invalid and there is a name we can
  2425. // assume that this is a named link
  2426. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2427. var element;
  2428. // Ensure the named link is a valid HTML ID attribute
  2429. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2430. // Find the slide with the specified ID
  2431. element = document.getElementById( name );
  2432. }
  2433. if( element ) {
  2434. // Find the position of the named slide and navigate to it
  2435. var indices = Reveal.getIndices( element );
  2436. slide( indices.h, indices.v );
  2437. }
  2438. // If the slide doesn't exist, navigate to the current slide
  2439. else {
  2440. slide( indexh || 0, indexv || 0 );
  2441. }
  2442. }
  2443. else {
  2444. // Read the index components of the hash
  2445. var h = parseInt( bits[0], 10 ) || 0,
  2446. v = parseInt( bits[1], 10 ) || 0;
  2447. if( h !== indexh || v !== indexv ) {
  2448. slide( h, v );
  2449. }
  2450. }
  2451. }
  2452. /**
  2453. * Updates the page URL (hash) to reflect the current
  2454. * state.
  2455. *
  2456. * @param {Number} delay The time in ms to wait before
  2457. * writing the hash
  2458. */
  2459. function writeURL( delay ) {
  2460. if( config.history ) {
  2461. // Make sure there's never more than one timeout running
  2462. clearTimeout( writeURLTimeout );
  2463. // If a delay is specified, timeout this call
  2464. if( typeof delay === 'number' ) {
  2465. writeURLTimeout = setTimeout( writeURL, delay );
  2466. }
  2467. else if( currentSlide ) {
  2468. var url = '/';
  2469. // Attempt to create a named link based on the slide's ID
  2470. var id = currentSlide.getAttribute( 'id' );
  2471. if( id ) {
  2472. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2473. }
  2474. // If the current slide has an ID, use that as a named link
  2475. if( typeof id === 'string' && id.length ) {
  2476. url = '/' + id;
  2477. }
  2478. // Otherwise use the /h/v index
  2479. else {
  2480. if( indexh > 0 || indexv > 0 ) url += indexh;
  2481. if( indexv > 0 ) url += '/' + indexv;
  2482. }
  2483. window.location.hash = url;
  2484. }
  2485. }
  2486. }
  2487. /**
  2488. * Retrieves the h/v location of the current, or specified,
  2489. * slide.
  2490. *
  2491. * @param {HTMLElement} slide If specified, the returned
  2492. * index will be for this slide rather than the currently
  2493. * active one
  2494. *
  2495. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2496. */
  2497. function getIndices( slide ) {
  2498. // By default, return the current indices
  2499. var h = indexh,
  2500. v = indexv,
  2501. f;
  2502. // If a slide is specified, return the indices of that slide
  2503. if( slide ) {
  2504. var isVertical = isVerticalSlide( slide );
  2505. var slideh = isVertical ? slide.parentNode : slide;
  2506. // Select all horizontal slides
  2507. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2508. // Now that we know which the horizontal slide is, get its index
  2509. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2510. // Assume we're not vertical
  2511. v = undefined;
  2512. // If this is a vertical slide, grab the vertical index
  2513. if( isVertical ) {
  2514. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2515. }
  2516. }
  2517. if( !slide && currentSlide ) {
  2518. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2519. if( hasFragments ) {
  2520. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2521. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2522. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2523. }
  2524. else {
  2525. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2526. }
  2527. }
  2528. }
  2529. return { h: h, v: v, f: f };
  2530. }
  2531. /**
  2532. * Retrieves the total number of slides in this presentation.
  2533. */
  2534. function getTotalSlides() {
  2535. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2536. }
  2537. /**
  2538. * Returns the slide element matching the specified index.
  2539. */
  2540. function getSlide( x, y ) {
  2541. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2542. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2543. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2544. return verticalSlides ? verticalSlides[ y ] : undefined;
  2545. }
  2546. return horizontalSlide;
  2547. }
  2548. /**
  2549. * Returns the background element for the given slide.
  2550. * All slides, even the ones with no background properties
  2551. * defined, have a background element so as long as the
  2552. * index is valid an element will be returned.
  2553. */
  2554. function getSlideBackground( x, y ) {
  2555. // When printing to PDF the slide backgrounds are nested
  2556. // inside of the slides
  2557. if( isPrintingPDF() ) {
  2558. var slide = getSlide( x, y );
  2559. if( slide ) {
  2560. var background = slide.querySelector( '.slide-background' );
  2561. if( background && background.parentNode === slide ) {
  2562. return background;
  2563. }
  2564. }
  2565. return undefined;
  2566. }
  2567. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2568. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2569. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2570. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2571. }
  2572. return horizontalBackground;
  2573. }
  2574. /**
  2575. * Retrieves the speaker notes from a slide. Notes can be
  2576. * defined in two ways:
  2577. * 1. As a data-notes attribute on the slide <section>
  2578. * 2. As an <aside class="notes"> inside of the slide
  2579. */
  2580. function getSlideNotes( slide ) {
  2581. // Default to the current slide
  2582. slide = slide || currentSlide;
  2583. // Notes can be specified via the data-notes attribute...
  2584. if( slide.hasAttribute( 'data-notes' ) ) {
  2585. return slide.getAttribute( 'data-notes' );
  2586. }
  2587. // ... or using an <aside class="notes"> element
  2588. var notesElement = slide.querySelector( 'aside.notes' );
  2589. if( notesElement ) {
  2590. return notesElement.innerHTML;
  2591. }
  2592. return null;
  2593. }
  2594. /**
  2595. * Retrieves the current state of the presentation as
  2596. * an object. This state can then be restored at any
  2597. * time.
  2598. */
  2599. function getState() {
  2600. var indices = getIndices();
  2601. return {
  2602. indexh: indices.h,
  2603. indexv: indices.v,
  2604. indexf: indices.f,
  2605. paused: isPaused(),
  2606. overview: isOverview()
  2607. };
  2608. }
  2609. /**
  2610. * Restores the presentation to the given state.
  2611. *
  2612. * @param {Object} state As generated by getState()
  2613. */
  2614. function setState( state ) {
  2615. if( typeof state === 'object' ) {
  2616. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2617. var pausedFlag = deserialize( state.paused ),
  2618. overviewFlag = deserialize( state.overview );
  2619. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2620. togglePause( pausedFlag );
  2621. }
  2622. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2623. toggleOverview( overviewFlag );
  2624. }
  2625. }
  2626. }
  2627. /**
  2628. * Return a sorted fragments list, ordered by an increasing
  2629. * "data-fragment-index" attribute.
  2630. *
  2631. * Fragments will be revealed in the order that they are returned by
  2632. * this function, so you can use the index attributes to control the
  2633. * order of fragment appearance.
  2634. *
  2635. * To maintain a sensible default fragment order, fragments are presumed
  2636. * to be passed in document order. This function adds a "fragment-index"
  2637. * attribute to each node if such an attribute is not already present,
  2638. * and sets that attribute to an integer value which is the position of
  2639. * the fragment within the fragments list.
  2640. */
  2641. function sortFragments( fragments ) {
  2642. fragments = toArray( fragments );
  2643. var ordered = [],
  2644. unordered = [],
  2645. sorted = [];
  2646. // Group ordered and unordered elements
  2647. fragments.forEach( function( fragment, i ) {
  2648. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2649. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2650. if( !ordered[index] ) {
  2651. ordered[index] = [];
  2652. }
  2653. ordered[index].push( fragment );
  2654. }
  2655. else {
  2656. unordered.push( [ fragment ] );
  2657. }
  2658. } );
  2659. // Append fragments without explicit indices in their
  2660. // DOM order
  2661. ordered = ordered.concat( unordered );
  2662. // Manually count the index up per group to ensure there
  2663. // are no gaps
  2664. var index = 0;
  2665. // Push all fragments in their sorted order to an array,
  2666. // this flattens the groups
  2667. ordered.forEach( function( group ) {
  2668. group.forEach( function( fragment ) {
  2669. sorted.push( fragment );
  2670. fragment.setAttribute( 'data-fragment-index', index );
  2671. } );
  2672. index ++;
  2673. } );
  2674. return sorted;
  2675. }
  2676. /**
  2677. * Navigate to the specified slide fragment.
  2678. *
  2679. * @param {Number} index The index of the fragment that
  2680. * should be shown, -1 means all are invisible
  2681. * @param {Number} offset Integer offset to apply to the
  2682. * fragment index
  2683. *
  2684. * @return {Boolean} true if a change was made in any
  2685. * fragments visibility as part of this call
  2686. */
  2687. function navigateFragment( index, offset ) {
  2688. if( currentSlide && config.fragments ) {
  2689. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2690. if( fragments.length ) {
  2691. // If no index is specified, find the current
  2692. if( typeof index !== 'number' ) {
  2693. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2694. if( lastVisibleFragment ) {
  2695. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2696. }
  2697. else {
  2698. index = -1;
  2699. }
  2700. }
  2701. // If an offset is specified, apply it to the index
  2702. if( typeof offset === 'number' ) {
  2703. index += offset;
  2704. }
  2705. var fragmentsShown = [],
  2706. fragmentsHidden = [];
  2707. toArray( fragments ).forEach( function( element, i ) {
  2708. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2709. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2710. }
  2711. // Visible fragments
  2712. if( i <= index ) {
  2713. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2714. element.classList.add( 'visible' );
  2715. element.classList.remove( 'current-fragment' );
  2716. // Announce the fragments one by one to the Screen Reader
  2717. dom.statusDiv.textContent = element.textContent;
  2718. if( i === index ) {
  2719. element.classList.add( 'current-fragment' );
  2720. }
  2721. }
  2722. // Hidden fragments
  2723. else {
  2724. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2725. element.classList.remove( 'visible' );
  2726. element.classList.remove( 'current-fragment' );
  2727. }
  2728. } );
  2729. if( fragmentsHidden.length ) {
  2730. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2731. }
  2732. if( fragmentsShown.length ) {
  2733. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2734. }
  2735. updateControls();
  2736. updateProgress();
  2737. return !!( fragmentsShown.length || fragmentsHidden.length );
  2738. }
  2739. }
  2740. return false;
  2741. }
  2742. /**
  2743. * Navigate to the next slide fragment.
  2744. *
  2745. * @return {Boolean} true if there was a next fragment,
  2746. * false otherwise
  2747. */
  2748. function nextFragment() {
  2749. return navigateFragment( null, 1 );
  2750. }
  2751. /**
  2752. * Navigate to the previous slide fragment.
  2753. *
  2754. * @return {Boolean} true if there was a previous fragment,
  2755. * false otherwise
  2756. */
  2757. function previousFragment() {
  2758. return navigateFragment( null, -1 );
  2759. }
  2760. /**
  2761. * Cues a new automated slide if enabled in the config.
  2762. */
  2763. function cueAutoSlide() {
  2764. cancelAutoSlide();
  2765. if( currentSlide ) {
  2766. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2767. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2768. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2769. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2770. // Pick value in the following priority order:
  2771. // 1. Current fragment's data-autoslide
  2772. // 2. Current slide's data-autoslide
  2773. // 3. Parent slide's data-autoslide
  2774. // 4. Global autoSlide setting
  2775. if( fragmentAutoSlide ) {
  2776. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2777. }
  2778. else if( slideAutoSlide ) {
  2779. autoSlide = parseInt( slideAutoSlide, 10 );
  2780. }
  2781. else if( parentAutoSlide ) {
  2782. autoSlide = parseInt( parentAutoSlide, 10 );
  2783. }
  2784. else {
  2785. autoSlide = config.autoSlide;
  2786. }
  2787. // If there are media elements with data-autoplay,
  2788. // automatically set the autoSlide duration to the
  2789. // length of that media. Not applicable if the slide
  2790. // is divided up into fragments.
  2791. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  2792. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2793. if( el.hasAttribute( 'data-autoplay' ) ) {
  2794. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2795. autoSlide = ( el.duration * 1000 ) + 1000;
  2796. }
  2797. }
  2798. } );
  2799. }
  2800. // Cue the next auto-slide if:
  2801. // - There is an autoSlide value
  2802. // - Auto-sliding isn't paused by the user
  2803. // - The presentation isn't paused
  2804. // - The overview isn't active
  2805. // - The presentation isn't over
  2806. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  2807. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2808. autoSlideStartTime = Date.now();
  2809. }
  2810. if( autoSlidePlayer ) {
  2811. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2812. }
  2813. }
  2814. }
  2815. /**
  2816. * Cancels any ongoing request to auto-slide.
  2817. */
  2818. function cancelAutoSlide() {
  2819. clearTimeout( autoSlideTimeout );
  2820. autoSlideTimeout = -1;
  2821. }
  2822. function pauseAutoSlide() {
  2823. if( autoSlide && !autoSlidePaused ) {
  2824. autoSlidePaused = true;
  2825. dispatchEvent( 'autoslidepaused' );
  2826. clearTimeout( autoSlideTimeout );
  2827. if( autoSlidePlayer ) {
  2828. autoSlidePlayer.setPlaying( false );
  2829. }
  2830. }
  2831. }
  2832. function resumeAutoSlide() {
  2833. if( autoSlide && autoSlidePaused ) {
  2834. autoSlidePaused = false;
  2835. dispatchEvent( 'autoslideresumed' );
  2836. cueAutoSlide();
  2837. }
  2838. }
  2839. function navigateLeft() {
  2840. // Reverse for RTL
  2841. if( config.rtl ) {
  2842. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2843. slide( indexh + 1 );
  2844. }
  2845. }
  2846. // Normal navigation
  2847. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2848. slide( indexh - 1 );
  2849. }
  2850. }
  2851. function navigateRight() {
  2852. // Reverse for RTL
  2853. if( config.rtl ) {
  2854. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2855. slide( indexh - 1 );
  2856. }
  2857. }
  2858. // Normal navigation
  2859. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2860. slide( indexh + 1 );
  2861. }
  2862. }
  2863. function navigateUp() {
  2864. // Prioritize hiding fragments
  2865. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2866. slide( indexh, indexv - 1 );
  2867. }
  2868. }
  2869. function navigateDown() {
  2870. // Prioritize revealing fragments
  2871. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2872. slide( indexh, indexv + 1 );
  2873. }
  2874. }
  2875. /**
  2876. * Navigates backwards, prioritized in the following order:
  2877. * 1) Previous fragment
  2878. * 2) Previous vertical slide
  2879. * 3) Previous horizontal slide
  2880. */
  2881. function navigatePrev() {
  2882. // Prioritize revealing fragments
  2883. if( previousFragment() === false ) {
  2884. if( availableRoutes().up ) {
  2885. navigateUp();
  2886. }
  2887. else {
  2888. // Fetch the previous horizontal slide, if there is one
  2889. var previousSlide;
  2890. if( config.rtl ) {
  2891. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  2892. }
  2893. else {
  2894. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  2895. }
  2896. if( previousSlide ) {
  2897. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2898. var h = indexh - 1;
  2899. slide( h, v );
  2900. }
  2901. }
  2902. }
  2903. }
  2904. /**
  2905. * The reverse of #navigatePrev().
  2906. */
  2907. function navigateNext() {
  2908. // Prioritize revealing fragments
  2909. if( nextFragment() === false ) {
  2910. if( availableRoutes().down ) {
  2911. navigateDown();
  2912. }
  2913. else if( config.rtl ) {
  2914. navigateLeft();
  2915. }
  2916. else {
  2917. navigateRight();
  2918. }
  2919. }
  2920. // If auto-sliding is enabled we need to cue up
  2921. // another timeout
  2922. cueAutoSlide();
  2923. }
  2924. // --------------------------------------------------------------------//
  2925. // ----------------------------- EVENTS -------------------------------//
  2926. // --------------------------------------------------------------------//
  2927. /**
  2928. * Called by all event handlers that are based on user
  2929. * input.
  2930. */
  2931. function onUserInput( event ) {
  2932. if( config.autoSlideStoppable ) {
  2933. pauseAutoSlide();
  2934. }
  2935. }
  2936. /**
  2937. * Handler for the document level 'keypress' event.
  2938. */
  2939. function onDocumentKeyPress( event ) {
  2940. // Check if the pressed key is question mark
  2941. if( event.shiftKey && event.charCode === 63 ) {
  2942. if( dom.overlay ) {
  2943. closeOverlay();
  2944. }
  2945. else {
  2946. showHelp( true );
  2947. }
  2948. }
  2949. }
  2950. /**
  2951. * Handler for the document level 'keydown' event.
  2952. */
  2953. function onDocumentKeyDown( event ) {
  2954. // If there's a condition specified and it returns false,
  2955. // ignore this event
  2956. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2957. return true;
  2958. }
  2959. // Remember if auto-sliding was paused so we can toggle it
  2960. var autoSlideWasPaused = autoSlidePaused;
  2961. onUserInput( event );
  2962. // Check if there's a focused element that could be using
  2963. // the keyboard
  2964. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  2965. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  2966. // Disregard the event if there's a focused element or a
  2967. // keyboard modifier key is present
  2968. if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2969. // While paused only allow resume keyboard events; 'b', '.''
  2970. var resumeKeyCodes = [66,190,191];
  2971. var key;
  2972. // Custom key bindings for togglePause should be able to resume
  2973. if( typeof config.keyboard === 'object' ) {
  2974. for( key in config.keyboard ) {
  2975. if( config.keyboard[key] === 'togglePause' ) {
  2976. resumeKeyCodes.push( parseInt( key, 10 ) );
  2977. }
  2978. }
  2979. }
  2980. if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
  2981. return false;
  2982. }
  2983. var triggered = false;
  2984. // 1. User defined key bindings
  2985. if( typeof config.keyboard === 'object' ) {
  2986. for( key in config.keyboard ) {
  2987. // Check if this binding matches the pressed key
  2988. if( parseInt( key, 10 ) === event.keyCode ) {
  2989. var value = config.keyboard[ key ];
  2990. // Callback function
  2991. if( typeof value === 'function' ) {
  2992. value.apply( null, [ event ] );
  2993. }
  2994. // String shortcuts to reveal.js API
  2995. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2996. Reveal[ value ].call();
  2997. }
  2998. triggered = true;
  2999. }
  3000. }
  3001. }
  3002. // 2. System defined key bindings
  3003. if( triggered === false ) {
  3004. // Assume true and try to prove false
  3005. triggered = true;
  3006. switch( event.keyCode ) {
  3007. // p, page up
  3008. case 80: case 33: navigatePrev(); break;
  3009. // n, page down
  3010. case 78: case 34: navigateNext(); break;
  3011. // h, left
  3012. case 72: case 37: navigateLeft(); break;
  3013. // l, right
  3014. case 76: case 39: navigateRight(); break;
  3015. // k, up
  3016. case 75: case 38: navigateUp(); break;
  3017. // j, down
  3018. case 74: case 40: navigateDown(); break;
  3019. // home
  3020. case 36: slide( 0 ); break;
  3021. // end
  3022. case 35: slide( Number.MAX_VALUE ); break;
  3023. // space
  3024. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  3025. // return
  3026. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  3027. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  3028. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  3029. // f
  3030. case 70: enterFullscreen(); break;
  3031. // a
  3032. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  3033. default:
  3034. triggered = false;
  3035. }
  3036. }
  3037. // If the input resulted in a triggered action we should prevent
  3038. // the browsers default behavior
  3039. if( triggered ) {
  3040. event.preventDefault && event.preventDefault();
  3041. }
  3042. // ESC or O key
  3043. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  3044. if( dom.overlay ) {
  3045. closeOverlay();
  3046. }
  3047. else {
  3048. toggleOverview();
  3049. }
  3050. event.preventDefault && event.preventDefault();
  3051. }
  3052. // If auto-sliding is enabled we need to cue up
  3053. // another timeout
  3054. cueAutoSlide();
  3055. }
  3056. /**
  3057. * Handler for the 'touchstart' event, enables support for
  3058. * swipe and pinch gestures.
  3059. */
  3060. function onTouchStart( event ) {
  3061. touch.startX = event.touches[0].clientX;
  3062. touch.startY = event.touches[0].clientY;
  3063. touch.startCount = event.touches.length;
  3064. // If there's two touches we need to memorize the distance
  3065. // between those two points to detect pinching
  3066. if( event.touches.length === 2 && config.overview ) {
  3067. touch.startSpan = distanceBetween( {
  3068. x: event.touches[1].clientX,
  3069. y: event.touches[1].clientY
  3070. }, {
  3071. x: touch.startX,
  3072. y: touch.startY
  3073. } );
  3074. }
  3075. }
  3076. /**
  3077. * Handler for the 'touchmove' event.
  3078. */
  3079. function onTouchMove( event ) {
  3080. // Each touch should only trigger one action
  3081. if( !touch.captured ) {
  3082. onUserInput( event );
  3083. var currentX = event.touches[0].clientX;
  3084. var currentY = event.touches[0].clientY;
  3085. // If the touch started with two points and still has
  3086. // two active touches; test for the pinch gesture
  3087. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  3088. // The current distance in pixels between the two touch points
  3089. var currentSpan = distanceBetween( {
  3090. x: event.touches[1].clientX,
  3091. y: event.touches[1].clientY
  3092. }, {
  3093. x: touch.startX,
  3094. y: touch.startY
  3095. } );
  3096. // If the span is larger than the desire amount we've got
  3097. // ourselves a pinch
  3098. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  3099. touch.captured = true;
  3100. if( currentSpan < touch.startSpan ) {
  3101. activateOverview();
  3102. }
  3103. else {
  3104. deactivateOverview();
  3105. }
  3106. }
  3107. event.preventDefault();
  3108. }
  3109. // There was only one touch point, look for a swipe
  3110. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  3111. var deltaX = currentX - touch.startX,
  3112. deltaY = currentY - touch.startY;
  3113. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3114. touch.captured = true;
  3115. navigateLeft();
  3116. }
  3117. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3118. touch.captured = true;
  3119. navigateRight();
  3120. }
  3121. else if( deltaY > touch.threshold ) {
  3122. touch.captured = true;
  3123. navigateUp();
  3124. }
  3125. else if( deltaY < -touch.threshold ) {
  3126. touch.captured = true;
  3127. navigateDown();
  3128. }
  3129. // If we're embedded, only block touch events if they have
  3130. // triggered an action
  3131. if( config.embedded ) {
  3132. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  3133. event.preventDefault();
  3134. }
  3135. }
  3136. // Not embedded? Block them all to avoid needless tossing
  3137. // around of the viewport in iOS
  3138. else {
  3139. event.preventDefault();
  3140. }
  3141. }
  3142. }
  3143. // There's a bug with swiping on some Android devices unless
  3144. // the default action is always prevented
  3145. else if( navigator.userAgent.match( /android/gi ) ) {
  3146. event.preventDefault();
  3147. }
  3148. }
  3149. /**
  3150. * Handler for the 'touchend' event.
  3151. */
  3152. function onTouchEnd( event ) {
  3153. touch.captured = false;
  3154. }
  3155. /**
  3156. * Convert pointer down to touch start.
  3157. */
  3158. function onPointerDown( event ) {
  3159. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3160. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3161. onTouchStart( event );
  3162. }
  3163. }
  3164. /**
  3165. * Convert pointer move to touch move.
  3166. */
  3167. function onPointerMove( event ) {
  3168. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3169. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3170. onTouchMove( event );
  3171. }
  3172. }
  3173. /**
  3174. * Convert pointer up to touch end.
  3175. */
  3176. function onPointerUp( event ) {
  3177. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3178. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3179. onTouchEnd( event );
  3180. }
  3181. }
  3182. /**
  3183. * Handles mouse wheel scrolling, throttled to avoid skipping
  3184. * multiple slides.
  3185. */
  3186. function onDocumentMouseScroll( event ) {
  3187. if( Date.now() - lastMouseWheelStep > 600 ) {
  3188. lastMouseWheelStep = Date.now();
  3189. var delta = event.detail || -event.wheelDelta;
  3190. if( delta > 0 ) {
  3191. navigateNext();
  3192. }
  3193. else {
  3194. navigatePrev();
  3195. }
  3196. }
  3197. }
  3198. /**
  3199. * Clicking on the progress bar results in a navigation to the
  3200. * closest approximate horizontal slide using this equation:
  3201. *
  3202. * ( clickX / presentationWidth ) * numberOfSlides
  3203. */
  3204. function onProgressClicked( event ) {
  3205. onUserInput( event );
  3206. event.preventDefault();
  3207. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  3208. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  3209. if( config.rtl ) {
  3210. slideIndex = slidesTotal - slideIndex;
  3211. }
  3212. slide( slideIndex );
  3213. }
  3214. /**
  3215. * Event handler for navigation control buttons.
  3216. */
  3217. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  3218. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  3219. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  3220. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  3221. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  3222. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  3223. /**
  3224. * Handler for the window level 'hashchange' event.
  3225. */
  3226. function onWindowHashChange( event ) {
  3227. readURL();
  3228. }
  3229. /**
  3230. * Handler for the window level 'resize' event.
  3231. */
  3232. function onWindowResize( event ) {
  3233. layout();
  3234. }
  3235. /**
  3236. * Handle for the window level 'visibilitychange' event.
  3237. */
  3238. function onPageVisibilityChange( event ) {
  3239. var isHidden = document.webkitHidden ||
  3240. document.msHidden ||
  3241. document.hidden;
  3242. // If, after clicking a link or similar and we're coming back,
  3243. // focus the document.body to ensure we can use keyboard shortcuts
  3244. if( isHidden === false && document.activeElement !== document.body ) {
  3245. // Not all elements support .blur() - SVGs among them.
  3246. if( typeof document.activeElement.blur === 'function' ) {
  3247. document.activeElement.blur();
  3248. }
  3249. document.body.focus();
  3250. }
  3251. }
  3252. /**
  3253. * Invoked when a slide is and we're in the overview.
  3254. */
  3255. function onOverviewSlideClicked( event ) {
  3256. // TODO There's a bug here where the event listeners are not
  3257. // removed after deactivating the overview.
  3258. if( eventsAreBound && isOverview() ) {
  3259. event.preventDefault();
  3260. var element = event.target;
  3261. while( element && !element.nodeName.match( /section/gi ) ) {
  3262. element = element.parentNode;
  3263. }
  3264. if( element && !element.classList.contains( 'disabled' ) ) {
  3265. deactivateOverview();
  3266. if( element.nodeName.match( /section/gi ) ) {
  3267. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  3268. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  3269. slide( h, v );
  3270. }
  3271. }
  3272. }
  3273. }
  3274. /**
  3275. * Handles clicks on links that are set to preview in the
  3276. * iframe overlay.
  3277. */
  3278. function onPreviewLinkClicked( event ) {
  3279. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3280. var url = event.currentTarget.getAttribute( 'href' );
  3281. if( url ) {
  3282. showPreview( url );
  3283. event.preventDefault();
  3284. }
  3285. }
  3286. }
  3287. /**
  3288. * Handles click on the auto-sliding controls element.
  3289. */
  3290. function onAutoSlidePlayerClick( event ) {
  3291. // Replay
  3292. if( Reveal.isLastSlide() && config.loop === false ) {
  3293. slide( 0, 0 );
  3294. resumeAutoSlide();
  3295. }
  3296. // Resume
  3297. else if( autoSlidePaused ) {
  3298. resumeAutoSlide();
  3299. }
  3300. // Pause
  3301. else {
  3302. pauseAutoSlide();
  3303. }
  3304. }
  3305. // --------------------------------------------------------------------//
  3306. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3307. // --------------------------------------------------------------------//
  3308. /**
  3309. * Constructor for the playback component, which displays
  3310. * play/pause/progress controls.
  3311. *
  3312. * @param {HTMLElement} container The component will append
  3313. * itself to this
  3314. * @param {Function} progressCheck A method which will be
  3315. * called frequently to get the current progress on a range
  3316. * of 0-1
  3317. */
  3318. function Playback( container, progressCheck ) {
  3319. // Cosmetics
  3320. this.diameter = 50;
  3321. this.thickness = 3;
  3322. // Flags if we are currently playing
  3323. this.playing = false;
  3324. // Current progress on a 0-1 range
  3325. this.progress = 0;
  3326. // Used to loop the animation smoothly
  3327. this.progressOffset = 1;
  3328. this.container = container;
  3329. this.progressCheck = progressCheck;
  3330. this.canvas = document.createElement( 'canvas' );
  3331. this.canvas.className = 'playback';
  3332. this.canvas.width = this.diameter;
  3333. this.canvas.height = this.diameter;
  3334. this.context = this.canvas.getContext( '2d' );
  3335. this.container.appendChild( this.canvas );
  3336. this.render();
  3337. }
  3338. Playback.prototype.setPlaying = function( value ) {
  3339. var wasPlaying = this.playing;
  3340. this.playing = value;
  3341. // Start repainting if we weren't already
  3342. if( !wasPlaying && this.playing ) {
  3343. this.animate();
  3344. }
  3345. else {
  3346. this.render();
  3347. }
  3348. };
  3349. Playback.prototype.animate = function() {
  3350. var progressBefore = this.progress;
  3351. this.progress = this.progressCheck();
  3352. // When we loop, offset the progress so that it eases
  3353. // smoothly rather than immediately resetting
  3354. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3355. this.progressOffset = this.progress;
  3356. }
  3357. this.render();
  3358. if( this.playing ) {
  3359. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3360. }
  3361. };
  3362. /**
  3363. * Renders the current progress and playback state.
  3364. */
  3365. Playback.prototype.render = function() {
  3366. var progress = this.playing ? this.progress : 0,
  3367. radius = ( this.diameter / 2 ) - this.thickness,
  3368. x = this.diameter / 2,
  3369. y = this.diameter / 2,
  3370. iconSize = 14;
  3371. // Ease towards 1
  3372. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3373. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3374. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3375. this.context.save();
  3376. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3377. // Solid background color
  3378. this.context.beginPath();
  3379. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  3380. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3381. this.context.fill();
  3382. // Draw progress track
  3383. this.context.beginPath();
  3384. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3385. this.context.lineWidth = this.thickness;
  3386. this.context.strokeStyle = '#666';
  3387. this.context.stroke();
  3388. if( this.playing ) {
  3389. // Draw progress on top of track
  3390. this.context.beginPath();
  3391. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3392. this.context.lineWidth = this.thickness;
  3393. this.context.strokeStyle = '#fff';
  3394. this.context.stroke();
  3395. }
  3396. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3397. // Draw play/pause icons
  3398. if( this.playing ) {
  3399. this.context.fillStyle = '#fff';
  3400. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  3401. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  3402. }
  3403. else {
  3404. this.context.beginPath();
  3405. this.context.translate( 2, 0 );
  3406. this.context.moveTo( 0, 0 );
  3407. this.context.lineTo( iconSize - 2, iconSize / 2 );
  3408. this.context.lineTo( 0, iconSize );
  3409. this.context.fillStyle = '#fff';
  3410. this.context.fill();
  3411. }
  3412. this.context.restore();
  3413. };
  3414. Playback.prototype.on = function( type, listener ) {
  3415. this.canvas.addEventListener( type, listener, false );
  3416. };
  3417. Playback.prototype.off = function( type, listener ) {
  3418. this.canvas.removeEventListener( type, listener, false );
  3419. };
  3420. Playback.prototype.destroy = function() {
  3421. this.playing = false;
  3422. if( this.canvas.parentNode ) {
  3423. this.container.removeChild( this.canvas );
  3424. }
  3425. };
  3426. // --------------------------------------------------------------------//
  3427. // ------------------------------- API --------------------------------//
  3428. // --------------------------------------------------------------------//
  3429. Reveal = {
  3430. initialize: initialize,
  3431. configure: configure,
  3432. sync: sync,
  3433. // Navigation methods
  3434. slide: slide,
  3435. left: navigateLeft,
  3436. right: navigateRight,
  3437. up: navigateUp,
  3438. down: navigateDown,
  3439. prev: navigatePrev,
  3440. next: navigateNext,
  3441. // Fragment methods
  3442. navigateFragment: navigateFragment,
  3443. prevFragment: previousFragment,
  3444. nextFragment: nextFragment,
  3445. // Deprecated aliases
  3446. navigateTo: slide,
  3447. navigateLeft: navigateLeft,
  3448. navigateRight: navigateRight,
  3449. navigateUp: navigateUp,
  3450. navigateDown: navigateDown,
  3451. navigatePrev: navigatePrev,
  3452. navigateNext: navigateNext,
  3453. // Forces an update in slide layout
  3454. layout: layout,
  3455. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3456. availableRoutes: availableRoutes,
  3457. // Returns an object with the available fragments as booleans (prev/next)
  3458. availableFragments: availableFragments,
  3459. // Toggles the overview mode on/off
  3460. toggleOverview: toggleOverview,
  3461. // Toggles the "black screen" mode on/off
  3462. togglePause: togglePause,
  3463. // Toggles the auto slide mode on/off
  3464. toggleAutoSlide: toggleAutoSlide,
  3465. // State checks
  3466. isOverview: isOverview,
  3467. isPaused: isPaused,
  3468. isAutoSliding: isAutoSliding,
  3469. // Adds or removes all internal event listeners (such as keyboard)
  3470. addEventListeners: addEventListeners,
  3471. removeEventListeners: removeEventListeners,
  3472. // Facility for persisting and restoring the presentation state
  3473. getState: getState,
  3474. setState: setState,
  3475. // Presentation progress on range of 0-1
  3476. getProgress: getProgress,
  3477. // Returns the indices of the current, or specified, slide
  3478. getIndices: getIndices,
  3479. getTotalSlides: getTotalSlides,
  3480. // Returns the slide element at the specified index
  3481. getSlide: getSlide,
  3482. // Returns the slide background element at the specified index
  3483. getSlideBackground: getSlideBackground,
  3484. // Returns the speaker notes string for a slide, or null
  3485. getSlideNotes: getSlideNotes,
  3486. // Returns the previous slide element, may be null
  3487. getPreviousSlide: function() {
  3488. return previousSlide;
  3489. },
  3490. // Returns the current slide element
  3491. getCurrentSlide: function() {
  3492. return currentSlide;
  3493. },
  3494. // Returns the current scale of the presentation content
  3495. getScale: function() {
  3496. return scale;
  3497. },
  3498. // Returns the current configuration object
  3499. getConfig: function() {
  3500. return config;
  3501. },
  3502. // Helper method, retrieves query string as a key/value hash
  3503. getQueryHash: function() {
  3504. var query = {};
  3505. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3506. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3507. } );
  3508. // Basic deserialization
  3509. for( var i in query ) {
  3510. var value = query[ i ];
  3511. query[ i ] = deserialize( unescape( value ) );
  3512. }
  3513. return query;
  3514. },
  3515. // Returns true if we're currently on the first slide
  3516. isFirstSlide: function() {
  3517. return ( indexh === 0 && indexv === 0 );
  3518. },
  3519. // Returns true if we're currently on the last slide
  3520. isLastSlide: function() {
  3521. if( currentSlide ) {
  3522. // Does this slide has next a sibling?
  3523. if( currentSlide.nextElementSibling ) return false;
  3524. // If it's vertical, does its parent have a next sibling?
  3525. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3526. return true;
  3527. }
  3528. return false;
  3529. },
  3530. // Checks if reveal.js has been loaded and is ready for use
  3531. isReady: function() {
  3532. return loaded;
  3533. },
  3534. // Forward event binding to the reveal DOM element
  3535. addEventListener: function( type, listener, useCapture ) {
  3536. if( 'addEventListener' in window ) {
  3537. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3538. }
  3539. },
  3540. removeEventListener: function( type, listener, useCapture ) {
  3541. if( 'addEventListener' in window ) {
  3542. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3543. }
  3544. },
  3545. // Programatically triggers a keyboard event
  3546. triggerKey: function( keyCode ) {
  3547. onDocumentKeyDown( { keyCode: keyCode } );
  3548. }
  3549. };
  3550. return Reveal;
  3551. }));