reveal.js 157 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970197119721973197419751976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030203120322033203420352036203720382039204020412042204320442045204620472048204920502051205220532054205520562057205820592060206120622063206420652066206720682069207020712072207320742075207620772078207920802081208220832084208520862087208820892090209120922093209420952096209720982099210021012102210321042105210621072108210921102111211221132114211521162117211821192120212121222123212421252126212721282129213021312132213321342135213621372138213921402141214221432144214521462147214821492150215121522153215421552156215721582159216021612162216321642165216621672168216921702171217221732174217521762177217821792180218121822183218421852186218721882189219021912192219321942195219621972198219922002201220222032204220522062207220822092210221122122213221422152216221722182219222022212222222322242225222622272228222922302231223222332234223522362237223822392240224122422243224422452246224722482249225022512252225322542255225622572258225922602261226222632264226522662267226822692270227122722273227422752276227722782279228022812282228322842285228622872288228922902291229222932294229522962297229822992300230123022303230423052306230723082309231023112312231323142315231623172318231923202321232223232324232523262327232823292330233123322333233423352336233723382339234023412342234323442345234623472348234923502351235223532354235523562357235823592360236123622363236423652366236723682369237023712372237323742375237623772378237923802381238223832384238523862387238823892390239123922393239423952396239723982399240024012402240324042405240624072408240924102411241224132414241524162417241824192420242124222423242424252426242724282429243024312432243324342435243624372438243924402441244224432444244524462447244824492450245124522453245424552456245724582459246024612462246324642465246624672468246924702471247224732474247524762477247824792480248124822483248424852486248724882489249024912492249324942495249624972498249925002501250225032504250525062507250825092510251125122513251425152516251725182519252025212522252325242525252625272528252925302531253225332534253525362537253825392540254125422543254425452546254725482549255025512552255325542555255625572558255925602561256225632564256525662567256825692570257125722573257425752576257725782579258025812582258325842585258625872588258925902591259225932594259525962597259825992600260126022603260426052606260726082609261026112612261326142615261626172618261926202621262226232624262526262627262826292630263126322633263426352636263726382639264026412642264326442645264626472648264926502651265226532654265526562657265826592660266126622663266426652666266726682669267026712672267326742675267626772678267926802681268226832684268526862687268826892690269126922693269426952696269726982699270027012702270327042705270627072708270927102711271227132714271527162717271827192720272127222723272427252726272727282729273027312732273327342735273627372738273927402741274227432744274527462747274827492750275127522753275427552756275727582759276027612762276327642765276627672768276927702771277227732774277527762777277827792780278127822783278427852786278727882789279027912792279327942795279627972798279928002801280228032804280528062807280828092810281128122813281428152816281728182819282028212822282328242825282628272828282928302831283228332834283528362837283828392840284128422843284428452846284728482849285028512852285328542855285628572858285928602861286228632864286528662867286828692870287128722873287428752876287728782879288028812882288328842885288628872888288928902891289228932894289528962897289828992900290129022903290429052906290729082909291029112912291329142915291629172918291929202921292229232924292529262927292829292930293129322933293429352936293729382939294029412942294329442945294629472948294929502951295229532954295529562957295829592960296129622963296429652966296729682969297029712972297329742975297629772978297929802981298229832984298529862987298829892990299129922993299429952996299729982999300030013002300330043005300630073008300930103011301230133014301530163017301830193020302130223023302430253026302730283029303030313032303330343035303630373038303930403041304230433044304530463047304830493050305130523053305430553056305730583059306030613062306330643065306630673068306930703071307230733074307530763077307830793080308130823083308430853086308730883089309030913092309330943095309630973098309931003101310231033104310531063107310831093110311131123113311431153116311731183119312031213122312331243125312631273128312931303131313231333134313531363137313831393140314131423143314431453146314731483149315031513152315331543155315631573158315931603161316231633164316531663167316831693170317131723173317431753176317731783179318031813182318331843185318631873188318931903191319231933194319531963197319831993200320132023203320432053206320732083209321032113212321332143215321632173218321932203221322232233224322532263227322832293230323132323233323432353236323732383239324032413242324332443245324632473248324932503251325232533254325532563257325832593260326132623263326432653266326732683269327032713272327332743275327632773278327932803281328232833284328532863287328832893290329132923293329432953296329732983299330033013302330333043305330633073308330933103311331233133314331533163317331833193320332133223323332433253326332733283329333033313332333333343335333633373338333933403341334233433344334533463347334833493350335133523353335433553356335733583359336033613362336333643365336633673368336933703371337233733374337533763377337833793380338133823383338433853386338733883389339033913392339333943395339633973398339934003401340234033404340534063407340834093410341134123413341434153416341734183419342034213422342334243425342634273428342934303431343234333434343534363437343834393440344134423443344434453446344734483449345034513452345334543455345634573458345934603461346234633464346534663467346834693470347134723473347434753476347734783479348034813482348334843485348634873488348934903491349234933494349534963497349834993500350135023503350435053506350735083509351035113512351335143515351635173518351935203521352235233524352535263527352835293530353135323533353435353536353735383539354035413542354335443545354635473548354935503551355235533554355535563557355835593560356135623563356435653566356735683569357035713572357335743575357635773578357935803581358235833584358535863587358835893590359135923593359435953596359735983599360036013602360336043605360636073608360936103611361236133614361536163617361836193620362136223623362436253626362736283629363036313632363336343635363636373638363936403641364236433644364536463647364836493650365136523653365436553656365736583659366036613662366336643665366636673668366936703671367236733674367536763677367836793680368136823683368436853686368736883689369036913692369336943695369636973698369937003701370237033704370537063707370837093710371137123713371437153716371737183719372037213722372337243725372637273728372937303731373237333734373537363737373837393740374137423743374437453746374737483749375037513752375337543755375637573758375937603761376237633764376537663767376837693770377137723773377437753776377737783779378037813782378337843785378637873788378937903791379237933794379537963797379837993800380138023803380438053806380738083809381038113812381338143815381638173818381938203821382238233824382538263827382838293830383138323833383438353836383738383839384038413842384338443845384638473848384938503851385238533854385538563857385838593860386138623863386438653866386738683869387038713872387338743875387638773878387938803881388238833884388538863887388838893890389138923893389438953896389738983899390039013902390339043905390639073908390939103911391239133914391539163917391839193920392139223923392439253926392739283929393039313932393339343935393639373938393939403941394239433944394539463947394839493950395139523953395439553956395739583959396039613962396339643965396639673968396939703971397239733974397539763977397839793980398139823983398439853986398739883989399039913992399339943995399639973998399940004001400240034004400540064007400840094010401140124013401440154016401740184019402040214022402340244025402640274028402940304031403240334034403540364037403840394040404140424043404440454046404740484049405040514052405340544055405640574058405940604061406240634064406540664067406840694070407140724073407440754076407740784079408040814082408340844085408640874088408940904091409240934094409540964097409840994100410141024103410441054106410741084109411041114112411341144115411641174118411941204121412241234124412541264127412841294130413141324133413441354136413741384139414041414142414341444145414641474148414941504151415241534154415541564157415841594160416141624163416441654166416741684169417041714172417341744175417641774178417941804181418241834184418541864187418841894190419141924193419441954196419741984199420042014202420342044205420642074208420942104211421242134214421542164217421842194220422142224223422442254226422742284229423042314232423342344235423642374238423942404241424242434244424542464247424842494250425142524253425442554256425742584259426042614262426342644265426642674268426942704271427242734274427542764277427842794280428142824283428442854286428742884289429042914292429342944295429642974298429943004301430243034304430543064307430843094310431143124313431443154316431743184319432043214322432343244325432643274328432943304331433243334334433543364337433843394340434143424343434443454346434743484349435043514352435343544355435643574358435943604361436243634364436543664367436843694370437143724373437443754376437743784379438043814382438343844385438643874388438943904391439243934394439543964397439843994400440144024403440444054406440744084409441044114412441344144415441644174418441944204421442244234424442544264427442844294430443144324433443444354436443744384439444044414442444344444445444644474448444944504451445244534454445544564457445844594460446144624463446444654466446744684469447044714472447344744475447644774478447944804481448244834484448544864487448844894490449144924493449444954496449744984499450045014502450345044505450645074508450945104511451245134514451545164517451845194520452145224523452445254526452745284529453045314532453345344535453645374538453945404541454245434544454545464547454845494550455145524553455445554556455745584559456045614562456345644565456645674568456945704571457245734574457545764577457845794580458145824583458445854586458745884589459045914592459345944595459645974598459946004601460246034604460546064607460846094610461146124613461446154616461746184619462046214622462346244625462646274628462946304631463246334634463546364637463846394640464146424643464446454646464746484649465046514652465346544655465646574658465946604661466246634664466546664667466846694670467146724673467446754676467746784679468046814682468346844685468646874688468946904691469246934694469546964697469846994700470147024703470447054706470747084709471047114712471347144715471647174718471947204721472247234724472547264727472847294730473147324733473447354736473747384739474047414742474347444745474647474748474947504751475247534754475547564757475847594760476147624763476447654766476747684769477047714772477347744775477647774778477947804781478247834784478547864787478847894790479147924793479447954796479747984799480048014802480348044805480648074808480948104811481248134814481548164817481848194820482148224823482448254826482748284829483048314832483348344835483648374838483948404841484248434844484548464847484848494850485148524853485448554856485748584859486048614862486348644865486648674868486948704871487248734874487548764877487848794880488148824883488448854886488748884889489048914892489348944895489648974898489949004901490249034904490549064907490849094910491149124913491449154916491749184919492049214922492349244925492649274928492949304931493249334934493549364937493849394940494149424943494449454946494749484949495049514952495349544955495649574958495949604961496249634964496549664967496849694970497149724973497449754976497749784979498049814982498349844985498649874988498949904991499249934994499549964997499849995000500150025003500450055006500750085009501050115012501350145015501650175018501950205021502250235024502550265027502850295030503150325033503450355036503750385039504050415042504350445045504650475048504950505051505250535054505550565057505850595060506150625063506450655066506750685069507050715072507350745075507650775078507950805081508250835084508550865087508850895090509150925093509450955096509750985099510051015102510351045105510651075108510951105111511251135114511551165117511851195120512151225123512451255126512751285129513051315132513351345135513651375138513951405141514251435144514551465147514851495150515151525153515451555156515751585159516051615162516351645165516651675168516951705171517251735174517551765177517851795180518151825183518451855186518751885189519051915192519351945195519651975198519952005201520252035204520552065207520852095210521152125213521452155216521752185219522052215222522352245225522652275228522952305231523252335234523552365237523852395240524152425243524452455246524752485249525052515252525352545255525652575258525952605261526252635264526552665267526852695270527152725273527452755276527752785279528052815282528352845285528652875288528952905291529252935294529552965297529852995300530153025303530453055306530753085309531053115312531353145315531653175318531953205321532253235324532553265327532853295330533153325333533453355336533753385339534053415342534353445345534653475348534953505351535253535354535553565357535853595360536153625363536453655366536753685369537053715372537353745375537653775378537953805381538253835384538553865387538853895390539153925393539453955396539753985399540054015402540354045405540654075408540954105411541254135414541554165417541854195420542154225423542454255426542754285429543054315432543354345435543654375438543954405441544254435444544554465447544854495450545154525453545454555456545754585459546054615462546354645465546654675468546954705471547254735474547554765477547854795480548154825483548454855486548754885489549054915492549354945495549654975498549955005501550255035504550555065507550855095510551155125513551455155516551755185519552055215522552355245525552655275528552955305531553255335534553555365537553855395540554155425543554455455546554755485549555055515552555355545555555655575558555955605561556255635564556555665567556855695570557155725573557455755576557755785579558055815582558355845585558655875588558955905591559255935594559555965597559855995600560156025603560456055606560756085609561056115612561356145615561656175618561956205621562256235624562556265627562856295630563156325633563456355636563756385639564056415642564356445645564656475648564956505651565256535654565556565657565856595660566156625663566456655666566756685669567056715672567356745675567656775678567956805681568256835684568556865687568856895690569156925693569456955696569756985699570057015702570357045705570657075708570957105711571257135714571557165717571857195720572157225723572457255726572757285729573057315732573357345735573657375738573957405741574257435744574557465747574857495750575157525753575457555756575757585759576057615762576357645765
  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2018 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. // The reveal.js version
  26. var VERSION = '3.7.0';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display presentation control arrows
  44. controls: true,
  45. // Help the user learn the controls by providing hints, for example by
  46. // bouncing the down arrow when they first encounter a vertical slide
  47. controlsTutorial: true,
  48. // Determines where controls appear, "edges" or "bottom-right"
  49. controlsLayout: 'bottom-right',
  50. // Visibility rule for backwards navigation arrows; "faded", "hidden"
  51. // or "visible"
  52. controlsBackArrows: 'faded',
  53. // Display a presentation progress bar
  54. progress: true,
  55. // Display the page number of the current slide
  56. slideNumber: false,
  57. // Use 1 based indexing for # links to match slide number (default is zero
  58. // based)
  59. hashOneBasedIndex: false,
  60. // Determine which displays to show the slide number on
  61. showSlideNumber: 'all',
  62. // Push each slide change to the browser history. Implies `hash: true`
  63. history: false,
  64. // Change the hash when changing slides -- impacts browser history with `history: true`
  65. hash: false,
  66. // Enable keyboard shortcuts for navigation
  67. keyboard: true,
  68. // Optional function that blocks keyboard events when retuning false
  69. keyboardCondition: null,
  70. // Enable the slide overview mode
  71. overview: true,
  72. // Disables the default reveal.js slide layout so that you can use
  73. // custom CSS layout
  74. disableLayout: false,
  75. // Vertical centering of slides
  76. center: true,
  77. // Enables touch navigation on devices with touch input
  78. touch: true,
  79. // Loop the presentation
  80. loop: false,
  81. // Change the presentation direction to be RTL
  82. rtl: false,
  83. // Randomizes the order of slides each time the presentation loads
  84. shuffle: false,
  85. // Turns fragments on and off globally
  86. fragments: true,
  87. // Flags whether to include the current fragment in the URL,
  88. // so that reloading brings you to the same fragment position
  89. fragmentInURL: false,
  90. // Flags if the presentation is running in an embedded mode,
  91. // i.e. contained within a limited portion of the screen
  92. embedded: false,
  93. // Flags if we should show a help overlay when the question-mark
  94. // key is pressed
  95. help: true,
  96. // Flags if it should be possible to pause the presentation (blackout)
  97. pause: true,
  98. // Flags if speaker notes should be visible to all viewers
  99. showNotes: false,
  100. // Global override for autolaying embedded media (video/audio/iframe)
  101. // - null: Media will only autoplay if data-autoplay is present
  102. // - true: All media will autoplay, regardless of individual setting
  103. // - false: No media will autoplay, regardless of individual setting
  104. autoPlayMedia: null,
  105. // Controls automatic progression to the next slide
  106. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  107. // is present on the current slide or fragment
  108. // - 1+: All slides will progress automatically at the given interval
  109. // - false: No auto-sliding, even if data-autoslide is present
  110. autoSlide: 0,
  111. // Stop auto-sliding after user input
  112. autoSlideStoppable: true,
  113. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  114. autoSlideMethod: null,
  115. // Specify the average time in seconds that you think you will spend
  116. // presenting each slide. This is used to show a pacing timer in the
  117. // speaker view
  118. defaultTiming: null,
  119. // Enable slide navigation via mouse wheel
  120. mouseWheel: false,
  121. // Apply a 3D roll to links on hover
  122. rollingLinks: false,
  123. // Hides the address bar on mobile devices
  124. hideAddressBar: true,
  125. // Opens links in an iframe preview overlay
  126. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  127. // individually
  128. previewLinks: false,
  129. // Exposes the reveal.js API through window.postMessage
  130. postMessage: true,
  131. // Dispatches all reveal.js events to the parent window through postMessage
  132. postMessageEvents: false,
  133. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  134. focusBodyOnPageVisibilityChange: true,
  135. // Transition style
  136. transition: 'slide', // none/fade/slide/convex/concave/zoom
  137. // Transition speed
  138. transitionSpeed: 'default', // default/fast/slow
  139. // Transition style for full page slide backgrounds
  140. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  141. // Parallax background image
  142. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  143. // Parallax background size
  144. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  145. // Parallax background repeat
  146. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  147. // Parallax background position
  148. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  149. // Amount of pixels to move the parallax background per slide step
  150. parallaxBackgroundHorizontal: null,
  151. parallaxBackgroundVertical: null,
  152. // The maximum number of pages a single slide can expand onto when printing
  153. // to PDF, unlimited by default
  154. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  155. // Prints each fragment on a separate slide
  156. pdfSeparateFragments: true,
  157. // Offset used to reduce the height of content within exported PDF pages.
  158. // This exists to account for environment differences based on how you
  159. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  160. // on precisely the total height of the document whereas in-browser
  161. // printing has to end one pixel before.
  162. pdfPageHeightOffset: -1,
  163. // Number of slides away from the current that are visible
  164. viewDistance: 3,
  165. // The display mode that will be used to show slides
  166. display: 'block',
  167. // Hide cursor if inactive
  168. hideInactiveCursor: true,
  169. // Time before the cursor is hidden (in ms)
  170. hideCursorTime: 5000,
  171. // Script dependencies to load
  172. dependencies: []
  173. },
  174. // Flags if Reveal.initialize() has been called
  175. initialized = false,
  176. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  177. loaded = false,
  178. // Flags if the overview mode is currently active
  179. overview = false,
  180. // Holds the dimensions of our overview slides, including margins
  181. overviewSlideWidth = null,
  182. overviewSlideHeight = null,
  183. // The horizontal and vertical index of the currently active slide
  184. indexh,
  185. indexv,
  186. // The previous and current slide HTML elements
  187. previousSlide,
  188. currentSlide,
  189. previousBackground,
  190. // Remember which directions that the user has navigated towards
  191. hasNavigatedRight = false,
  192. hasNavigatedDown = false,
  193. // Slides may hold a data-state attribute which we pick up and apply
  194. // as a class to the body. This list contains the combined state of
  195. // all current slides.
  196. state = [],
  197. // The current scale of the presentation (see width/height config)
  198. scale = 1,
  199. // CSS transform that is currently applied to the slides container,
  200. // split into two groups
  201. slidesTransform = { layout: '', overview: '' },
  202. // Cached references to DOM elements
  203. dom = {},
  204. // Features supported by the browser, see #checkCapabilities()
  205. features = {},
  206. // Client is a mobile device, see #checkCapabilities()
  207. isMobileDevice,
  208. // Client is a desktop Chrome, see #checkCapabilities()
  209. isChrome,
  210. // Throttles mouse wheel navigation
  211. lastMouseWheelStep = 0,
  212. // Delays updates to the URL due to a Chrome thumbnailer bug
  213. writeURLTimeout = 0,
  214. // Is the mouse pointer currently hidden from view
  215. cursorHidden = false,
  216. // Timeout used to determine when the cursor is inactive
  217. cursorInactiveTimeout = 0,
  218. // Flags if the interaction event listeners are bound
  219. eventsAreBound = false,
  220. // The current auto-slide duration
  221. autoSlide = 0,
  222. // Auto slide properties
  223. autoSlidePlayer,
  224. autoSlideTimeout = 0,
  225. autoSlideStartTime = -1,
  226. autoSlidePaused = false,
  227. // Holds information about the currently ongoing touch input
  228. touch = {
  229. startX: 0,
  230. startY: 0,
  231. startSpan: 0,
  232. startCount: 0,
  233. captured: false,
  234. threshold: 40
  235. },
  236. // Holds information about the keyboard shortcuts
  237. keyboardShortcuts = {
  238. 'N , SPACE': 'Next slide',
  239. 'P': 'Previous slide',
  240. '← , H': 'Navigate left',
  241. '→ , L': 'Navigate right',
  242. '↑ , K': 'Navigate up',
  243. '↓ , J': 'Navigate down',
  244. 'Home , ⌘/CTRL ←': 'First slide',
  245. 'End , ⌘/CTRL →': 'Last slide',
  246. 'B , .': 'Pause',
  247. 'F': 'Fullscreen',
  248. 'ESC, O': 'Slide overview'
  249. },
  250. // Holds custom key code mappings
  251. registeredKeyBindings = {};
  252. /**
  253. * Starts up the presentation if the client is capable.
  254. */
  255. function initialize( options ) {
  256. // Make sure we only initialize once
  257. if( initialized === true ) return;
  258. initialized = true;
  259. checkCapabilities();
  260. if( !features.transforms2d && !features.transforms3d ) {
  261. document.body.setAttribute( 'class', 'no-transforms' );
  262. // Since JS won't be running any further, we load all lazy
  263. // loading elements upfront
  264. var images = toArray( document.getElementsByTagName( 'img' ) ),
  265. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  266. var lazyLoadable = images.concat( iframes );
  267. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  268. var element = lazyLoadable[i];
  269. if( element.getAttribute( 'data-src' ) ) {
  270. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  271. element.removeAttribute( 'data-src' );
  272. }
  273. }
  274. // If the browser doesn't support core features we won't be
  275. // using JavaScript to control the presentation
  276. return;
  277. }
  278. // Cache references to key DOM elements
  279. dom.wrapper = document.querySelector( '.reveal' );
  280. dom.slides = document.querySelector( '.reveal .slides' );
  281. // Force a layout when the whole page, incl fonts, has loaded
  282. window.addEventListener( 'load', layout, false );
  283. var query = Reveal.getQueryHash();
  284. // Do not accept new dependencies via query config to avoid
  285. // the potential of malicious script injection
  286. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  287. // Copy options over to our config object
  288. extend( config, options );
  289. extend( config, query );
  290. // Hide the address bar in mobile browsers
  291. hideAddressBar();
  292. // Loads the dependencies and continues to #start() once done
  293. load();
  294. }
  295. /**
  296. * Inspect the client to see what it's capable of, this
  297. * should only happens once per runtime.
  298. */
  299. function checkCapabilities() {
  300. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  301. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  302. var testElement = document.createElement( 'div' );
  303. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  304. 'MozPerspective' in testElement.style ||
  305. 'msPerspective' in testElement.style ||
  306. 'OPerspective' in testElement.style ||
  307. 'perspective' in testElement.style;
  308. features.transforms2d = 'WebkitTransform' in testElement.style ||
  309. 'MozTransform' in testElement.style ||
  310. 'msTransform' in testElement.style ||
  311. 'OTransform' in testElement.style ||
  312. 'transform' in testElement.style;
  313. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  314. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  315. features.canvas = !!document.createElement( 'canvas' ).getContext;
  316. // Transitions in the overview are disabled in desktop and
  317. // Safari due to lag
  318. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  319. // Flags if we should use zoom instead of transform to scale
  320. // up slides. Zoom produces crisper results but has a lot of
  321. // xbrowser quirks so we only use it in whitelsited browsers.
  322. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  323. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  324. }
  325. /**
  326. * Loads the dependencies of reveal.js. Dependencies are
  327. * defined via the configuration option 'dependencies'
  328. * and will be loaded prior to starting/binding reveal.js.
  329. * Some dependencies may have an 'async' flag, if so they
  330. * will load after reveal.js has been started up.
  331. */
  332. function load() {
  333. var scripts = [],
  334. scriptsAsync = [],
  335. scriptsToPreload = 0;
  336. // Called once synchronous scripts finish loading
  337. function afterSynchronousScriptsLoaded() {
  338. // Load asynchronous scripts
  339. if( scriptsAsync.length ) {
  340. scriptsAsync.forEach( function( s ) {
  341. loadScript( s.src, s.callback );
  342. } );
  343. }
  344. start();
  345. }
  346. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  347. var s = config.dependencies[i];
  348. // Load if there's no condition or the condition is truthy
  349. if( !s.condition || s.condition() ) {
  350. if( s.async ) {
  351. scriptsAsync.push( s );
  352. }
  353. else {
  354. scripts.push( s );
  355. }
  356. }
  357. }
  358. if( scripts.length ) {
  359. scriptsToPreload = scripts.length;
  360. // Load synchronous scripts
  361. scripts.forEach( function( s ) {
  362. loadScript( s.src, function() {
  363. if( typeof s.callback === 'function' ) s.callback();
  364. if( --scriptsToPreload === 0 ) {
  365. afterSynchronousScriptsLoaded();
  366. }
  367. } );
  368. } );
  369. }
  370. else {
  371. afterSynchronousScriptsLoaded();
  372. }
  373. }
  374. /**
  375. * Loads a JavaScript file from the given URL and executes it.
  376. *
  377. * @param {string} url Address of the .js file to load
  378. * @param {function} callback Method to invoke when the script
  379. * has loaded and executed
  380. */
  381. function loadScript( url, callback ) {
  382. var script = document.createElement( 'script' );
  383. script.type = 'text/javascript';
  384. script.async = false;
  385. script.defer = false;
  386. script.src = url;
  387. if( callback ) {
  388. // Success callback
  389. script.onload = script.onreadystatechange = function( event ) {
  390. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  391. // Kill event listeners
  392. script.onload = script.onreadystatechange = script.onerror = null;
  393. callback();
  394. }
  395. };
  396. // Error callback
  397. script.onerror = function( err ) {
  398. // Kill event listeners
  399. script.onload = script.onreadystatechange = script.onerror = null;
  400. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  401. };
  402. }
  403. // Append the script at the end of <head>
  404. var head = document.querySelector( 'head' );
  405. head.insertBefore( script, head.lastChild );
  406. }
  407. /**
  408. * Starts up reveal.js by binding input events and navigating
  409. * to the current URL deeplink if there is one.
  410. */
  411. function start() {
  412. loaded = true;
  413. // Make sure we've got all the DOM elements we need
  414. setupDOM();
  415. // Listen to messages posted to this window
  416. setupPostMessage();
  417. // Prevent the slides from being scrolled out of view
  418. setupScrollPrevention();
  419. // Resets all vertical slides so that only the first is visible
  420. resetVerticalSlides();
  421. // Updates the presentation to match the current configuration values
  422. configure();
  423. // Read the initial hash
  424. readURL();
  425. // Update all backgrounds
  426. updateBackground( true );
  427. // Notify listeners that the presentation is ready but use a 1ms
  428. // timeout to ensure it's not fired synchronously after #initialize()
  429. setTimeout( function() {
  430. // Enable transitions now that we're loaded
  431. dom.slides.classList.remove( 'no-transition' );
  432. dom.wrapper.classList.add( 'ready' );
  433. dispatchEvent( 'ready', {
  434. 'indexh': indexh,
  435. 'indexv': indexv,
  436. 'currentSlide': currentSlide
  437. } );
  438. }, 1 );
  439. // Special setup and config is required when printing to PDF
  440. if( isPrintingPDF() ) {
  441. removeEventListeners();
  442. // The document needs to have loaded for the PDF layout
  443. // measurements to be accurate
  444. if( document.readyState === 'complete' ) {
  445. setupPDF();
  446. }
  447. else {
  448. window.addEventListener( 'load', setupPDF );
  449. }
  450. }
  451. }
  452. /**
  453. * Finds and stores references to DOM elements which are
  454. * required by the presentation. If a required element is
  455. * not found, it is created.
  456. */
  457. function setupDOM() {
  458. // Prevent transitions while we're loading
  459. dom.slides.classList.add( 'no-transition' );
  460. if( isMobileDevice ) {
  461. dom.wrapper.classList.add( 'no-hover' );
  462. }
  463. else {
  464. dom.wrapper.classList.remove( 'no-hover' );
  465. }
  466. if( /iphone/gi.test( UA ) ) {
  467. dom.wrapper.classList.add( 'ua-iphone' );
  468. }
  469. else {
  470. dom.wrapper.classList.remove( 'ua-iphone' );
  471. }
  472. // Background element
  473. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  474. // Progress bar
  475. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  476. dom.progressbar = dom.progress.querySelector( 'span' );
  477. // Arrow controls
  478. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  479. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  480. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  481. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  482. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  483. // Slide number
  484. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  485. // Element containing notes that are visible to the audience
  486. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  487. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  488. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  489. // Overlay graphic which is displayed during the paused mode
  490. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  491. dom.wrapper.setAttribute( 'role', 'application' );
  492. // There can be multiple instances of controls throughout the page
  493. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  494. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  495. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  496. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  497. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  498. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  499. // The right and down arrows in the standard reveal.js controls
  500. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  501. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  502. dom.statusDiv = createStatusDiv();
  503. }
  504. /**
  505. * Creates a hidden div with role aria-live to announce the
  506. * current slide content. Hide the div off-screen to make it
  507. * available only to Assistive Technologies.
  508. *
  509. * @return {HTMLElement}
  510. */
  511. function createStatusDiv() {
  512. var statusDiv = document.getElementById( 'aria-status-div' );
  513. if( !statusDiv ) {
  514. statusDiv = document.createElement( 'div' );
  515. statusDiv.style.position = 'absolute';
  516. statusDiv.style.height = '1px';
  517. statusDiv.style.width = '1px';
  518. statusDiv.style.overflow = 'hidden';
  519. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  520. statusDiv.setAttribute( 'id', 'aria-status-div' );
  521. statusDiv.setAttribute( 'aria-live', 'polite' );
  522. statusDiv.setAttribute( 'aria-atomic','true' );
  523. dom.wrapper.appendChild( statusDiv );
  524. }
  525. return statusDiv;
  526. }
  527. /**
  528. * Converts the given HTML element into a string of text
  529. * that can be announced to a screen reader. Hidden
  530. * elements are excluded.
  531. */
  532. function getStatusText( node ) {
  533. var text = '';
  534. // Text node
  535. if( node.nodeType === 3 ) {
  536. text += node.textContent;
  537. }
  538. // Element node
  539. else if( node.nodeType === 1 ) {
  540. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  541. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  542. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  543. toArray( node.childNodes ).forEach( function( child ) {
  544. text += getStatusText( child );
  545. } );
  546. }
  547. }
  548. return text;
  549. }
  550. /**
  551. * Configures the presentation for printing to a static
  552. * PDF.
  553. */
  554. function setupPDF() {
  555. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  556. // Dimensions of the PDF pages
  557. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  558. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  559. // Dimensions of slides within the pages
  560. var slideWidth = slideSize.width,
  561. slideHeight = slideSize.height;
  562. // Let the browser know what page size we want to print
  563. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  564. // Limit the size of certain elements to the dimensions of the slide
  565. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  566. document.body.classList.add( 'print-pdf' );
  567. document.body.style.width = pageWidth + 'px';
  568. document.body.style.height = pageHeight + 'px';
  569. // Make sure stretch elements fit on slide
  570. layoutSlideContents( slideWidth, slideHeight );
  571. // Add each slide's index as attributes on itself, we need these
  572. // indices to generate slide numbers below
  573. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  574. hslide.setAttribute( 'data-index-h', h );
  575. if( hslide.classList.contains( 'stack' ) ) {
  576. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  577. vslide.setAttribute( 'data-index-h', h );
  578. vslide.setAttribute( 'data-index-v', v );
  579. } );
  580. }
  581. } );
  582. // Slide and slide background layout
  583. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  584. // Vertical stacks are not centred since their section
  585. // children will be
  586. if( slide.classList.contains( 'stack' ) === false ) {
  587. // Center the slide inside of the page, giving the slide some margin
  588. var left = ( pageWidth - slideWidth ) / 2,
  589. top = ( pageHeight - slideHeight ) / 2;
  590. var contentHeight = slide.scrollHeight;
  591. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  592. // Adhere to configured pages per slide limit
  593. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  594. // Center slides vertically
  595. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  596. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  597. }
  598. // Wrap the slide in a page element and hide its overflow
  599. // so that no page ever flows onto another
  600. var page = document.createElement( 'div' );
  601. page.className = 'pdf-page';
  602. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  603. slide.parentNode.insertBefore( page, slide );
  604. page.appendChild( slide );
  605. // Position the slide inside of the page
  606. slide.style.left = left + 'px';
  607. slide.style.top = top + 'px';
  608. slide.style.width = slideWidth + 'px';
  609. if( slide.slideBackgroundElement ) {
  610. page.insertBefore( slide.slideBackgroundElement, slide );
  611. }
  612. // Inject notes if `showNotes` is enabled
  613. if( config.showNotes ) {
  614. // Are there notes for this slide?
  615. var notes = getSlideNotes( slide );
  616. if( notes ) {
  617. var notesSpacing = 8;
  618. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  619. var notesElement = document.createElement( 'div' );
  620. notesElement.classList.add( 'speaker-notes' );
  621. notesElement.classList.add( 'speaker-notes-pdf' );
  622. notesElement.setAttribute( 'data-layout', notesLayout );
  623. notesElement.innerHTML = notes;
  624. if( notesLayout === 'separate-page' ) {
  625. page.parentNode.insertBefore( notesElement, page.nextSibling );
  626. }
  627. else {
  628. notesElement.style.left = notesSpacing + 'px';
  629. notesElement.style.bottom = notesSpacing + 'px';
  630. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  631. page.appendChild( notesElement );
  632. }
  633. }
  634. }
  635. // Inject slide numbers if `slideNumbers` are enabled
  636. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  637. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  638. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  639. var numberElement = document.createElement( 'div' );
  640. numberElement.classList.add( 'slide-number' );
  641. numberElement.classList.add( 'slide-number-pdf' );
  642. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  643. page.appendChild( numberElement );
  644. }
  645. // Copy page and show fragments one after another
  646. if( config.pdfSeparateFragments ) {
  647. // Each fragment 'group' is an array containing one or more
  648. // fragments. Multiple fragments that appear at the same time
  649. // are part of the same group.
  650. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  651. var previousFragmentStep;
  652. var previousPage;
  653. fragmentGroups.forEach( function( fragments ) {
  654. // Remove 'current-fragment' from the previous group
  655. if( previousFragmentStep ) {
  656. previousFragmentStep.forEach( function( fragment ) {
  657. fragment.classList.remove( 'current-fragment' );
  658. } );
  659. }
  660. // Show the fragments for the current index
  661. fragments.forEach( function( fragment ) {
  662. fragment.classList.add( 'visible', 'current-fragment' );
  663. } );
  664. // Create a separate page for the current fragment state
  665. var clonedPage = page.cloneNode( true );
  666. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  667. previousFragmentStep = fragments;
  668. previousPage = clonedPage;
  669. } );
  670. // Reset the first/original page so that all fragments are hidden
  671. fragmentGroups.forEach( function( fragments ) {
  672. fragments.forEach( function( fragment ) {
  673. fragment.classList.remove( 'visible', 'current-fragment' );
  674. } );
  675. } );
  676. }
  677. // Show all fragments
  678. else {
  679. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  680. fragment.classList.add( 'visible' );
  681. } );
  682. }
  683. }
  684. } );
  685. // Notify subscribers that the PDF layout is good to go
  686. dispatchEvent( 'pdf-ready' );
  687. }
  688. /**
  689. * This is an unfortunate necessity. Some actions – such as
  690. * an input field being focused in an iframe or using the
  691. * keyboard to expand text selection beyond the bounds of
  692. * a slide – can trigger our content to be pushed out of view.
  693. * This scrolling can not be prevented by hiding overflow in
  694. * CSS (we already do) so we have to resort to repeatedly
  695. * checking if the slides have been offset :(
  696. */
  697. function setupScrollPrevention() {
  698. setInterval( function() {
  699. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  700. dom.wrapper.scrollTop = 0;
  701. dom.wrapper.scrollLeft = 0;
  702. }
  703. }, 1000 );
  704. }
  705. /**
  706. * Creates an HTML element and returns a reference to it.
  707. * If the element already exists the existing instance will
  708. * be returned.
  709. *
  710. * @param {HTMLElement} container
  711. * @param {string} tagname
  712. * @param {string} classname
  713. * @param {string} innerHTML
  714. *
  715. * @return {HTMLElement}
  716. */
  717. function createSingletonNode( container, tagname, classname, innerHTML ) {
  718. // Find all nodes matching the description
  719. var nodes = container.querySelectorAll( '.' + classname );
  720. // Check all matches to find one which is a direct child of
  721. // the specified container
  722. for( var i = 0; i < nodes.length; i++ ) {
  723. var testNode = nodes[i];
  724. if( testNode.parentNode === container ) {
  725. return testNode;
  726. }
  727. }
  728. // If no node was found, create it now
  729. var node = document.createElement( tagname );
  730. node.className = classname;
  731. if( typeof innerHTML === 'string' ) {
  732. node.innerHTML = innerHTML;
  733. }
  734. container.appendChild( node );
  735. return node;
  736. }
  737. /**
  738. * Creates the slide background elements and appends them
  739. * to the background container. One element is created per
  740. * slide no matter if the given slide has visible background.
  741. */
  742. function createBackgrounds() {
  743. var printMode = isPrintingPDF();
  744. // Clear prior backgrounds
  745. dom.background.innerHTML = '';
  746. dom.background.classList.add( 'no-transition' );
  747. // Iterate over all horizontal slides
  748. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  749. var backgroundStack = createBackground( slideh, dom.background );
  750. // Iterate over all vertical slides
  751. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  752. createBackground( slidev, backgroundStack );
  753. backgroundStack.classList.add( 'stack' );
  754. } );
  755. } );
  756. // Add parallax background if specified
  757. if( config.parallaxBackgroundImage ) {
  758. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  759. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  760. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  761. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  762. // Make sure the below properties are set on the element - these properties are
  763. // needed for proper transitions to be set on the element via CSS. To remove
  764. // annoying background slide-in effect when the presentation starts, apply
  765. // these properties after short time delay
  766. setTimeout( function() {
  767. dom.wrapper.classList.add( 'has-parallax-background' );
  768. }, 1 );
  769. }
  770. else {
  771. dom.background.style.backgroundImage = '';
  772. dom.wrapper.classList.remove( 'has-parallax-background' );
  773. }
  774. }
  775. /**
  776. * Creates a background for the given slide.
  777. *
  778. * @param {HTMLElement} slide
  779. * @param {HTMLElement} container The element that the background
  780. * should be appended to
  781. * @return {HTMLElement} New background div
  782. */
  783. function createBackground( slide, container ) {
  784. // Main slide background element
  785. var element = document.createElement( 'div' );
  786. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  787. // Inner background element that wraps images/videos/iframes
  788. var contentElement = document.createElement( 'div' );
  789. contentElement.className = 'slide-background-content';
  790. element.appendChild( contentElement );
  791. container.appendChild( element );
  792. slide.slideBackgroundElement = element;
  793. slide.slideBackgroundContentElement = contentElement;
  794. // Syncs the background to reflect all current background settings
  795. syncBackground( slide );
  796. return element;
  797. }
  798. /**
  799. * Renders all of the visual properties of a slide background
  800. * based on the various background attributes.
  801. *
  802. * @param {HTMLElement} slide
  803. */
  804. function syncBackground( slide ) {
  805. var element = slide.slideBackgroundElement,
  806. contentElement = slide.slideBackgroundContentElement;
  807. // Reset the prior background state in case this is not the
  808. // initial sync
  809. slide.classList.remove( 'has-dark-background' );
  810. slide.classList.remove( 'has-light-background' );
  811. element.removeAttribute( 'data-loaded' );
  812. element.removeAttribute( 'data-background-hash' );
  813. element.removeAttribute( 'data-background-size' );
  814. element.removeAttribute( 'data-background-transition' );
  815. element.style.backgroundColor = '';
  816. contentElement.style.backgroundSize = '';
  817. contentElement.style.backgroundRepeat = '';
  818. contentElement.style.backgroundPosition = '';
  819. contentElement.style.backgroundImage = '';
  820. contentElement.style.opacity = '';
  821. contentElement.innerHTML = '';
  822. var data = {
  823. background: slide.getAttribute( 'data-background' ),
  824. backgroundSize: slide.getAttribute( 'data-background-size' ),
  825. backgroundImage: slide.getAttribute( 'data-background-image' ),
  826. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  827. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  828. backgroundColor: slide.getAttribute( 'data-background-color' ),
  829. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  830. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  831. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  832. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  833. };
  834. if( data.background ) {
  835. // Auto-wrap image urls in url(...)
  836. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  837. slide.setAttribute( 'data-background-image', data.background );
  838. }
  839. else {
  840. element.style.background = data.background;
  841. }
  842. }
  843. // Create a hash for this combination of background settings.
  844. // This is used to determine when two slide backgrounds are
  845. // the same.
  846. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  847. element.setAttribute( 'data-background-hash', data.background +
  848. data.backgroundSize +
  849. data.backgroundImage +
  850. data.backgroundVideo +
  851. data.backgroundIframe +
  852. data.backgroundColor +
  853. data.backgroundRepeat +
  854. data.backgroundPosition +
  855. data.backgroundTransition +
  856. data.backgroundOpacity );
  857. }
  858. // Additional and optional background properties
  859. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  860. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  861. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  862. // Background image options are set on the content wrapper
  863. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  864. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  865. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  866. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  867. // If this slide has a background color, add a class that
  868. // signals if it is light or dark. If the slide has no background
  869. // color, no class will be set
  870. var computedBackgroundStyle = window.getComputedStyle( element );
  871. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  872. var rgb = colorToRgb( computedBackgroundStyle.backgroundColor );
  873. // Ignore fully transparent backgrounds. Some browsers return
  874. // rgba(0,0,0,0) when reading the computed background color of
  875. // an element with no background
  876. if( rgb && rgb.a !== 0 ) {
  877. if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) {
  878. slide.classList.add( 'has-dark-background' );
  879. }
  880. else {
  881. slide.classList.add( 'has-light-background' );
  882. }
  883. }
  884. }
  885. }
  886. /**
  887. * Registers a listener to postMessage events, this makes it
  888. * possible to call all reveal.js API methods from another
  889. * window. For example:
  890. *
  891. * revealWindow.postMessage( JSON.stringify({
  892. * method: 'slide',
  893. * args: [ 2 ]
  894. * }), '*' );
  895. */
  896. function setupPostMessage() {
  897. if( config.postMessage ) {
  898. window.addEventListener( 'message', function ( event ) {
  899. var data = event.data;
  900. // Make sure we're dealing with JSON
  901. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  902. data = JSON.parse( data );
  903. // Check if the requested method can be found
  904. if( data.method && typeof Reveal[data.method] === 'function' ) {
  905. Reveal[data.method].apply( Reveal, data.args );
  906. }
  907. }
  908. }, false );
  909. }
  910. }
  911. /**
  912. * Applies the configuration settings from the config
  913. * object. May be called multiple times.
  914. *
  915. * @param {object} options
  916. */
  917. function configure( options ) {
  918. var oldTransition = config.transition;
  919. // New config options may be passed when this method
  920. // is invoked through the API after initialization
  921. if( typeof options === 'object' ) extend( config, options );
  922. // Abort if reveal.js hasn't finished loading, config
  923. // changes will be applied automatically once loading
  924. // finishes
  925. if( loaded === false ) return;
  926. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  927. // Remove the previously configured transition class
  928. dom.wrapper.classList.remove( oldTransition );
  929. // Force linear transition based on browser capabilities
  930. if( features.transforms3d === false ) config.transition = 'linear';
  931. dom.wrapper.classList.add( config.transition );
  932. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  933. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  934. dom.controls.style.display = config.controls ? 'block' : 'none';
  935. dom.progress.style.display = config.progress ? 'block' : 'none';
  936. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  937. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  938. if( config.shuffle ) {
  939. shuffle();
  940. }
  941. if( config.rtl ) {
  942. dom.wrapper.classList.add( 'rtl' );
  943. }
  944. else {
  945. dom.wrapper.classList.remove( 'rtl' );
  946. }
  947. if( config.center ) {
  948. dom.wrapper.classList.add( 'center' );
  949. }
  950. else {
  951. dom.wrapper.classList.remove( 'center' );
  952. }
  953. // Exit the paused mode if it was configured off
  954. if( config.pause === false ) {
  955. resume();
  956. }
  957. if( config.showNotes ) {
  958. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  959. }
  960. if( config.mouseWheel ) {
  961. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  962. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  963. }
  964. else {
  965. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  966. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  967. }
  968. // Rolling 3D links
  969. if( config.rollingLinks ) {
  970. enableRollingLinks();
  971. }
  972. else {
  973. disableRollingLinks();
  974. }
  975. // Auto-hide the mouse pointer when its inactive
  976. if( config.hideInactiveCursor ) {
  977. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  978. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  979. }
  980. else {
  981. showCursor();
  982. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  983. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  984. }
  985. // Iframe link previews
  986. if( config.previewLinks ) {
  987. enablePreviewLinks();
  988. disablePreviewLinks( '[data-preview-link=false]' );
  989. }
  990. else {
  991. disablePreviewLinks();
  992. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  993. }
  994. // Remove existing auto-slide controls
  995. if( autoSlidePlayer ) {
  996. autoSlidePlayer.destroy();
  997. autoSlidePlayer = null;
  998. }
  999. // Generate auto-slide controls if needed
  1000. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1001. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1002. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1003. } );
  1004. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1005. autoSlidePaused = false;
  1006. }
  1007. // When fragments are turned off they should be visible
  1008. if( config.fragments === false ) {
  1009. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1010. element.classList.add( 'visible' );
  1011. element.classList.remove( 'current-fragment' );
  1012. } );
  1013. }
  1014. // Slide numbers
  1015. var slideNumberDisplay = 'none';
  1016. if( config.slideNumber && !isPrintingPDF() ) {
  1017. if( config.showSlideNumber === 'all' ) {
  1018. slideNumberDisplay = 'block';
  1019. }
  1020. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1021. slideNumberDisplay = 'block';
  1022. }
  1023. }
  1024. dom.slideNumber.style.display = slideNumberDisplay;
  1025. sync();
  1026. }
  1027. /**
  1028. * Binds all event listeners.
  1029. */
  1030. function addEventListeners() {
  1031. eventsAreBound = true;
  1032. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1033. window.addEventListener( 'resize', onWindowResize, false );
  1034. if( config.touch ) {
  1035. if( 'onpointerdown' in window ) {
  1036. // Use W3C pointer events
  1037. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1038. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1039. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1040. }
  1041. else if( window.navigator.msPointerEnabled ) {
  1042. // IE 10 uses prefixed version of pointer events
  1043. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1044. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1045. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1046. }
  1047. else {
  1048. // Fall back to touch events
  1049. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1050. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1051. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1052. }
  1053. }
  1054. if( config.keyboard ) {
  1055. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1056. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1057. }
  1058. if( config.progress && dom.progress ) {
  1059. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1060. }
  1061. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1062. if( config.focusBodyOnPageVisibilityChange ) {
  1063. var visibilityChange;
  1064. if( 'hidden' in document ) {
  1065. visibilityChange = 'visibilitychange';
  1066. }
  1067. else if( 'msHidden' in document ) {
  1068. visibilityChange = 'msvisibilitychange';
  1069. }
  1070. else if( 'webkitHidden' in document ) {
  1071. visibilityChange = 'webkitvisibilitychange';
  1072. }
  1073. if( visibilityChange ) {
  1074. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1075. }
  1076. }
  1077. // Listen to both touch and click events, in case the device
  1078. // supports both
  1079. var pointerEvents = [ 'touchstart', 'click' ];
  1080. // Only support touch for Android, fixes double navigations in
  1081. // stock browser
  1082. if( UA.match( /android/gi ) ) {
  1083. pointerEvents = [ 'touchstart' ];
  1084. }
  1085. pointerEvents.forEach( function( eventName ) {
  1086. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1087. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1088. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1089. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1090. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1091. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1092. } );
  1093. }
  1094. /**
  1095. * Unbinds all event listeners.
  1096. */
  1097. function removeEventListeners() {
  1098. eventsAreBound = false;
  1099. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1100. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1101. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1102. window.removeEventListener( 'resize', onWindowResize, false );
  1103. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1104. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1105. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1106. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1107. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1108. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1109. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1110. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1111. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1112. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1113. if ( config.progress && dom.progress ) {
  1114. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1115. }
  1116. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1117. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1118. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1119. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1120. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1121. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1122. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1123. } );
  1124. }
  1125. /**
  1126. * Add a custom key binding with optional description to
  1127. * be added to the help screen.
  1128. */
  1129. function addKeyBinding( binding, callback ) {
  1130. if( typeof binding === 'object' && binding.keyCode ) {
  1131. registeredKeyBindings[binding.keyCode] = {
  1132. callback: callback,
  1133. key: binding.key,
  1134. description: binding.description
  1135. };
  1136. }
  1137. else {
  1138. registeredKeyBindings[binding] = {
  1139. callback: callback,
  1140. key: null,
  1141. description: null
  1142. };
  1143. }
  1144. }
  1145. /**
  1146. * Removes the specified custom key binding.
  1147. */
  1148. function removeKeyBinding( keyCode ) {
  1149. delete registeredKeyBindings[keyCode];
  1150. }
  1151. /**
  1152. * Extend object a with the properties of object b.
  1153. * If there's a conflict, object b takes precedence.
  1154. *
  1155. * @param {object} a
  1156. * @param {object} b
  1157. */
  1158. function extend( a, b ) {
  1159. for( var i in b ) {
  1160. a[ i ] = b[ i ];
  1161. }
  1162. return a;
  1163. }
  1164. /**
  1165. * Converts the target object to an array.
  1166. *
  1167. * @param {object} o
  1168. * @return {object[]}
  1169. */
  1170. function toArray( o ) {
  1171. return Array.prototype.slice.call( o );
  1172. }
  1173. /**
  1174. * Utility for deserializing a value.
  1175. *
  1176. * @param {*} value
  1177. * @return {*}
  1178. */
  1179. function deserialize( value ) {
  1180. if( typeof value === 'string' ) {
  1181. if( value === 'null' ) return null;
  1182. else if( value === 'true' ) return true;
  1183. else if( value === 'false' ) return false;
  1184. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1185. }
  1186. return value;
  1187. }
  1188. /**
  1189. * Measures the distance in pixels between point a
  1190. * and point b.
  1191. *
  1192. * @param {object} a point with x/y properties
  1193. * @param {object} b point with x/y properties
  1194. *
  1195. * @return {number}
  1196. */
  1197. function distanceBetween( a, b ) {
  1198. var dx = a.x - b.x,
  1199. dy = a.y - b.y;
  1200. return Math.sqrt( dx*dx + dy*dy );
  1201. }
  1202. /**
  1203. * Applies a CSS transform to the target element.
  1204. *
  1205. * @param {HTMLElement} element
  1206. * @param {string} transform
  1207. */
  1208. function transformElement( element, transform ) {
  1209. element.style.WebkitTransform = transform;
  1210. element.style.MozTransform = transform;
  1211. element.style.msTransform = transform;
  1212. element.style.transform = transform;
  1213. }
  1214. /**
  1215. * Applies CSS transforms to the slides container. The container
  1216. * is transformed from two separate sources: layout and the overview
  1217. * mode.
  1218. *
  1219. * @param {object} transforms
  1220. */
  1221. function transformSlides( transforms ) {
  1222. // Pick up new transforms from arguments
  1223. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1224. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1225. // Apply the transforms to the slides container
  1226. if( slidesTransform.layout ) {
  1227. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1228. }
  1229. else {
  1230. transformElement( dom.slides, slidesTransform.overview );
  1231. }
  1232. }
  1233. /**
  1234. * Injects the given CSS styles into the DOM.
  1235. *
  1236. * @param {string} value
  1237. */
  1238. function injectStyleSheet( value ) {
  1239. var tag = document.createElement( 'style' );
  1240. tag.type = 'text/css';
  1241. if( tag.styleSheet ) {
  1242. tag.styleSheet.cssText = value;
  1243. }
  1244. else {
  1245. tag.appendChild( document.createTextNode( value ) );
  1246. }
  1247. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1248. }
  1249. /**
  1250. * Find the closest parent that matches the given
  1251. * selector.
  1252. *
  1253. * @param {HTMLElement} target The child element
  1254. * @param {String} selector The CSS selector to match
  1255. * the parents against
  1256. *
  1257. * @return {HTMLElement} The matched parent or null
  1258. * if no matching parent was found
  1259. */
  1260. function closestParent( target, selector ) {
  1261. var parent = target.parentNode;
  1262. while( parent ) {
  1263. // There's some overhead doing this each time, we don't
  1264. // want to rewrite the element prototype but should still
  1265. // be enough to feature detect once at startup...
  1266. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1267. // If we find a match, we're all set
  1268. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1269. return parent;
  1270. }
  1271. // Keep searching
  1272. parent = parent.parentNode;
  1273. }
  1274. return null;
  1275. }
  1276. /**
  1277. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1278. *
  1279. * @param {string} color The string representation of a color
  1280. * @example
  1281. * colorToRgb('#000');
  1282. * @example
  1283. * colorToRgb('#000000');
  1284. * @example
  1285. * colorToRgb('rgb(0,0,0)');
  1286. * @example
  1287. * colorToRgb('rgba(0,0,0)');
  1288. *
  1289. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1290. */
  1291. function colorToRgb( color ) {
  1292. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1293. if( hex3 && hex3[1] ) {
  1294. hex3 = hex3[1];
  1295. return {
  1296. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1297. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1298. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1299. };
  1300. }
  1301. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1302. if( hex6 && hex6[1] ) {
  1303. hex6 = hex6[1];
  1304. return {
  1305. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1306. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1307. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1308. };
  1309. }
  1310. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1311. if( rgb ) {
  1312. return {
  1313. r: parseInt( rgb[1], 10 ),
  1314. g: parseInt( rgb[2], 10 ),
  1315. b: parseInt( rgb[3], 10 )
  1316. };
  1317. }
  1318. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1319. if( rgba ) {
  1320. return {
  1321. r: parseInt( rgba[1], 10 ),
  1322. g: parseInt( rgba[2], 10 ),
  1323. b: parseInt( rgba[3], 10 ),
  1324. a: parseFloat( rgba[4] )
  1325. };
  1326. }
  1327. return null;
  1328. }
  1329. /**
  1330. * Calculates brightness on a scale of 0-255.
  1331. *
  1332. * @param {string} color See colorToRgb for supported formats.
  1333. * @see {@link colorToRgb}
  1334. */
  1335. function colorBrightness( color ) {
  1336. if( typeof color === 'string' ) color = colorToRgb( color );
  1337. if( color ) {
  1338. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1339. }
  1340. return null;
  1341. }
  1342. /**
  1343. * Returns the remaining height within the parent of the
  1344. * target element.
  1345. *
  1346. * remaining height = [ configured parent height ] - [ current parent height ]
  1347. *
  1348. * @param {HTMLElement} element
  1349. * @param {number} [height]
  1350. */
  1351. function getRemainingHeight( element, height ) {
  1352. height = height || 0;
  1353. if( element ) {
  1354. var newHeight, oldHeight = element.style.height;
  1355. // Change the .stretch element height to 0 in order find the height of all
  1356. // the other elements
  1357. element.style.height = '0px';
  1358. newHeight = height - element.parentNode.offsetHeight;
  1359. // Restore the old height, just in case
  1360. element.style.height = oldHeight + 'px';
  1361. return newHeight;
  1362. }
  1363. return height;
  1364. }
  1365. /**
  1366. * Checks if this instance is being used to print a PDF.
  1367. */
  1368. function isPrintingPDF() {
  1369. return ( /print-pdf/gi ).test( window.location.search );
  1370. }
  1371. /**
  1372. * Check if this instance is being used to print a PDF with fragments.
  1373. */
  1374. function isPrintingPDFFragments() {
  1375. return ( /print-pdf-fragments/gi ).test( window.location.search );
  1376. }
  1377. /**
  1378. * Hides the address bar if we're on a mobile device.
  1379. */
  1380. function hideAddressBar() {
  1381. if( config.hideAddressBar && isMobileDevice ) {
  1382. // Events that should trigger the address bar to hide
  1383. window.addEventListener( 'load', removeAddressBar, false );
  1384. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1385. }
  1386. }
  1387. /**
  1388. * Causes the address bar to hide on mobile devices,
  1389. * more vertical space ftw.
  1390. */
  1391. function removeAddressBar() {
  1392. setTimeout( function() {
  1393. window.scrollTo( 0, 1 );
  1394. }, 10 );
  1395. }
  1396. /**
  1397. * Dispatches an event of the specified type from the
  1398. * reveal DOM element.
  1399. */
  1400. function dispatchEvent( type, args ) {
  1401. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1402. event.initEvent( type, true, true );
  1403. extend( event, args );
  1404. dom.wrapper.dispatchEvent( event );
  1405. // If we're in an iframe, post each reveal.js event to the
  1406. // parent window. Used by the notes plugin
  1407. if( config.postMessageEvents && window.parent !== window.self ) {
  1408. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1409. }
  1410. }
  1411. /**
  1412. * Wrap all links in 3D goodness.
  1413. */
  1414. function enableRollingLinks() {
  1415. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1416. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1417. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1418. var anchor = anchors[i];
  1419. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1420. var span = document.createElement('span');
  1421. span.setAttribute('data-title', anchor.text);
  1422. span.innerHTML = anchor.innerHTML;
  1423. anchor.classList.add( 'roll' );
  1424. anchor.innerHTML = '';
  1425. anchor.appendChild(span);
  1426. }
  1427. }
  1428. }
  1429. }
  1430. /**
  1431. * Unwrap all 3D links.
  1432. */
  1433. function disableRollingLinks() {
  1434. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1435. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1436. var anchor = anchors[i];
  1437. var span = anchor.querySelector( 'span' );
  1438. if( span ) {
  1439. anchor.classList.remove( 'roll' );
  1440. anchor.innerHTML = span.innerHTML;
  1441. }
  1442. }
  1443. }
  1444. /**
  1445. * Bind preview frame links.
  1446. *
  1447. * @param {string} [selector=a] - selector for anchors
  1448. */
  1449. function enablePreviewLinks( selector ) {
  1450. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1451. anchors.forEach( function( element ) {
  1452. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1453. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1454. }
  1455. } );
  1456. }
  1457. /**
  1458. * Unbind preview frame links.
  1459. */
  1460. function disablePreviewLinks( selector ) {
  1461. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1462. anchors.forEach( function( element ) {
  1463. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1464. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1465. }
  1466. } );
  1467. }
  1468. /**
  1469. * Opens a preview window for the target URL.
  1470. *
  1471. * @param {string} url - url for preview iframe src
  1472. */
  1473. function showPreview( url ) {
  1474. closeOverlay();
  1475. dom.overlay = document.createElement( 'div' );
  1476. dom.overlay.classList.add( 'overlay' );
  1477. dom.overlay.classList.add( 'overlay-preview' );
  1478. dom.wrapper.appendChild( dom.overlay );
  1479. dom.overlay.innerHTML = [
  1480. '<header>',
  1481. '<a class="close" href="#"><span class="icon"></span></a>',
  1482. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1483. '</header>',
  1484. '<div class="spinner"></div>',
  1485. '<div class="viewport">',
  1486. '<iframe src="'+ url +'"></iframe>',
  1487. '<small class="viewport-inner">',
  1488. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1489. '</small>',
  1490. '</div>'
  1491. ].join('');
  1492. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1493. dom.overlay.classList.add( 'loaded' );
  1494. }, false );
  1495. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1496. closeOverlay();
  1497. event.preventDefault();
  1498. }, false );
  1499. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1500. closeOverlay();
  1501. }, false );
  1502. setTimeout( function() {
  1503. dom.overlay.classList.add( 'visible' );
  1504. }, 1 );
  1505. }
  1506. /**
  1507. * Open or close help overlay window.
  1508. *
  1509. * @param {Boolean} [override] Flag which overrides the
  1510. * toggle logic and forcibly sets the desired state. True means
  1511. * help is open, false means it's closed.
  1512. */
  1513. function toggleHelp( override ){
  1514. if( typeof override === 'boolean' ) {
  1515. override ? showHelp() : closeOverlay();
  1516. }
  1517. else {
  1518. if( dom.overlay ) {
  1519. closeOverlay();
  1520. }
  1521. else {
  1522. showHelp();
  1523. }
  1524. }
  1525. }
  1526. /**
  1527. * Opens an overlay window with help material.
  1528. */
  1529. function showHelp() {
  1530. if( config.help ) {
  1531. closeOverlay();
  1532. dom.overlay = document.createElement( 'div' );
  1533. dom.overlay.classList.add( 'overlay' );
  1534. dom.overlay.classList.add( 'overlay-help' );
  1535. dom.wrapper.appendChild( dom.overlay );
  1536. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1537. html += '<table><th>KEY</th><th>ACTION</th>';
  1538. for( var key in keyboardShortcuts ) {
  1539. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1540. }
  1541. // Add custom key bindings that have associated descriptions
  1542. for( var binding in registeredKeyBindings ) {
  1543. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1544. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1545. }
  1546. }
  1547. html += '</table>';
  1548. dom.overlay.innerHTML = [
  1549. '<header>',
  1550. '<a class="close" href="#"><span class="icon"></span></a>',
  1551. '</header>',
  1552. '<div class="viewport">',
  1553. '<div class="viewport-inner">'+ html +'</div>',
  1554. '</div>'
  1555. ].join('');
  1556. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1557. closeOverlay();
  1558. event.preventDefault();
  1559. }, false );
  1560. setTimeout( function() {
  1561. dom.overlay.classList.add( 'visible' );
  1562. }, 1 );
  1563. }
  1564. }
  1565. /**
  1566. * Closes any currently open overlay.
  1567. */
  1568. function closeOverlay() {
  1569. if( dom.overlay ) {
  1570. dom.overlay.parentNode.removeChild( dom.overlay );
  1571. dom.overlay = null;
  1572. }
  1573. }
  1574. /**
  1575. * Applies JavaScript-controlled layout rules to the
  1576. * presentation.
  1577. */
  1578. function layout() {
  1579. if( dom.wrapper && !isPrintingPDF() ) {
  1580. if( !config.disableLayout ) {
  1581. var size = getComputedSlideSize();
  1582. // Layout the contents of the slides
  1583. layoutSlideContents( config.width, config.height );
  1584. dom.slides.style.width = size.width + 'px';
  1585. dom.slides.style.height = size.height + 'px';
  1586. // Determine scale of content to fit within available space
  1587. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1588. // Respect max/min scale settings
  1589. scale = Math.max( scale, config.minScale );
  1590. scale = Math.min( scale, config.maxScale );
  1591. // Don't apply any scaling styles if scale is 1
  1592. if( scale === 1 ) {
  1593. dom.slides.style.zoom = '';
  1594. dom.slides.style.left = '';
  1595. dom.slides.style.top = '';
  1596. dom.slides.style.bottom = '';
  1597. dom.slides.style.right = '';
  1598. transformSlides( { layout: '' } );
  1599. }
  1600. else {
  1601. // Prefer zoom for scaling up so that content remains crisp.
  1602. // Don't use zoom to scale down since that can lead to shifts
  1603. // in text layout/line breaks.
  1604. if( scale > 1 && features.zoom ) {
  1605. dom.slides.style.zoom = scale;
  1606. dom.slides.style.left = '';
  1607. dom.slides.style.top = '';
  1608. dom.slides.style.bottom = '';
  1609. dom.slides.style.right = '';
  1610. transformSlides( { layout: '' } );
  1611. }
  1612. // Apply scale transform as a fallback
  1613. else {
  1614. dom.slides.style.zoom = '';
  1615. dom.slides.style.left = '50%';
  1616. dom.slides.style.top = '50%';
  1617. dom.slides.style.bottom = 'auto';
  1618. dom.slides.style.right = 'auto';
  1619. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1620. }
  1621. }
  1622. // Select all slides, vertical and horizontal
  1623. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1624. for( var i = 0, len = slides.length; i < len; i++ ) {
  1625. var slide = slides[ i ];
  1626. // Don't bother updating invisible slides
  1627. if( slide.style.display === 'none' ) {
  1628. continue;
  1629. }
  1630. if( config.center || slide.classList.contains( 'center' ) ) {
  1631. // Vertical stacks are not centred since their section
  1632. // children will be
  1633. if( slide.classList.contains( 'stack' ) ) {
  1634. slide.style.top = 0;
  1635. }
  1636. else {
  1637. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1638. }
  1639. }
  1640. else {
  1641. slide.style.top = '';
  1642. }
  1643. }
  1644. }
  1645. updateProgress();
  1646. updateParallax();
  1647. if( isOverview() ) {
  1648. updateOverview();
  1649. }
  1650. }
  1651. }
  1652. /**
  1653. * Applies layout logic to the contents of all slides in
  1654. * the presentation.
  1655. *
  1656. * @param {string|number} width
  1657. * @param {string|number} height
  1658. */
  1659. function layoutSlideContents( width, height ) {
  1660. // Handle sizing of elements with the 'stretch' class
  1661. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1662. // Determine how much vertical space we can use
  1663. var remainingHeight = getRemainingHeight( element, height );
  1664. // Consider the aspect ratio of media elements
  1665. if( /(img|video)/gi.test( element.nodeName ) ) {
  1666. var nw = element.naturalWidth || element.videoWidth,
  1667. nh = element.naturalHeight || element.videoHeight;
  1668. var es = Math.min( width / nw, remainingHeight / nh );
  1669. element.style.width = ( nw * es ) + 'px';
  1670. element.style.height = ( nh * es ) + 'px';
  1671. }
  1672. else {
  1673. element.style.width = width + 'px';
  1674. element.style.height = remainingHeight + 'px';
  1675. }
  1676. } );
  1677. }
  1678. /**
  1679. * Calculates the computed pixel size of our slides. These
  1680. * values are based on the width and height configuration
  1681. * options.
  1682. *
  1683. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1684. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1685. */
  1686. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1687. var size = {
  1688. // Slide size
  1689. width: config.width,
  1690. height: config.height,
  1691. // Presentation size
  1692. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1693. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1694. };
  1695. // Reduce available space by margin
  1696. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1697. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1698. // Slide width may be a percentage of available width
  1699. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1700. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1701. }
  1702. // Slide height may be a percentage of available height
  1703. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1704. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1705. }
  1706. return size;
  1707. }
  1708. /**
  1709. * Stores the vertical index of a stack so that the same
  1710. * vertical slide can be selected when navigating to and
  1711. * from the stack.
  1712. *
  1713. * @param {HTMLElement} stack The vertical stack element
  1714. * @param {string|number} [v=0] Index to memorize
  1715. */
  1716. function setPreviousVerticalIndex( stack, v ) {
  1717. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1718. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1719. }
  1720. }
  1721. /**
  1722. * Retrieves the vertical index which was stored using
  1723. * #setPreviousVerticalIndex() or 0 if no previous index
  1724. * exists.
  1725. *
  1726. * @param {HTMLElement} stack The vertical stack element
  1727. */
  1728. function getPreviousVerticalIndex( stack ) {
  1729. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1730. // Prefer manually defined start-indexv
  1731. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1732. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1733. }
  1734. return 0;
  1735. }
  1736. /**
  1737. * Displays the overview of slides (quick nav) by scaling
  1738. * down and arranging all slide elements.
  1739. */
  1740. function activateOverview() {
  1741. // Only proceed if enabled in config
  1742. if( config.overview && !isOverview() ) {
  1743. overview = true;
  1744. dom.wrapper.classList.add( 'overview' );
  1745. dom.wrapper.classList.remove( 'overview-deactivating' );
  1746. if( features.overviewTransitions ) {
  1747. setTimeout( function() {
  1748. dom.wrapper.classList.add( 'overview-animated' );
  1749. }, 1 );
  1750. }
  1751. // Don't auto-slide while in overview mode
  1752. cancelAutoSlide();
  1753. // Move the backgrounds element into the slide container to
  1754. // that the same scaling is applied
  1755. dom.slides.appendChild( dom.background );
  1756. // Clicking on an overview slide navigates to it
  1757. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1758. if( !slide.classList.contains( 'stack' ) ) {
  1759. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1760. }
  1761. } );
  1762. // Calculate slide sizes
  1763. var margin = 70;
  1764. var slideSize = getComputedSlideSize();
  1765. overviewSlideWidth = slideSize.width + margin;
  1766. overviewSlideHeight = slideSize.height + margin;
  1767. // Reverse in RTL mode
  1768. if( config.rtl ) {
  1769. overviewSlideWidth = -overviewSlideWidth;
  1770. }
  1771. updateSlidesVisibility();
  1772. layoutOverview();
  1773. updateOverview();
  1774. layout();
  1775. // Notify observers of the overview showing
  1776. dispatchEvent( 'overviewshown', {
  1777. 'indexh': indexh,
  1778. 'indexv': indexv,
  1779. 'currentSlide': currentSlide
  1780. } );
  1781. }
  1782. }
  1783. /**
  1784. * Uses CSS transforms to position all slides in a grid for
  1785. * display inside of the overview mode.
  1786. */
  1787. function layoutOverview() {
  1788. // Layout slides
  1789. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1790. hslide.setAttribute( 'data-index-h', h );
  1791. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1792. if( hslide.classList.contains( 'stack' ) ) {
  1793. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1794. vslide.setAttribute( 'data-index-h', h );
  1795. vslide.setAttribute( 'data-index-v', v );
  1796. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1797. } );
  1798. }
  1799. } );
  1800. // Layout slide backgrounds
  1801. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1802. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1803. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1804. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1805. } );
  1806. } );
  1807. }
  1808. /**
  1809. * Moves the overview viewport to the current slides.
  1810. * Called each time the current slide changes.
  1811. */
  1812. function updateOverview() {
  1813. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1814. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1815. transformSlides( {
  1816. overview: [
  1817. 'scale('+ scale +')',
  1818. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1819. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1820. ].join( ' ' )
  1821. } );
  1822. }
  1823. /**
  1824. * Exits the slide overview and enters the currently
  1825. * active slide.
  1826. */
  1827. function deactivateOverview() {
  1828. // Only proceed if enabled in config
  1829. if( config.overview ) {
  1830. overview = false;
  1831. dom.wrapper.classList.remove( 'overview' );
  1832. dom.wrapper.classList.remove( 'overview-animated' );
  1833. // Temporarily add a class so that transitions can do different things
  1834. // depending on whether they are exiting/entering overview, or just
  1835. // moving from slide to slide
  1836. dom.wrapper.classList.add( 'overview-deactivating' );
  1837. setTimeout( function () {
  1838. dom.wrapper.classList.remove( 'overview-deactivating' );
  1839. }, 1 );
  1840. // Move the background element back out
  1841. dom.wrapper.appendChild( dom.background );
  1842. // Clean up changes made to slides
  1843. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1844. transformElement( slide, '' );
  1845. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1846. } );
  1847. // Clean up changes made to backgrounds
  1848. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1849. transformElement( background, '' );
  1850. } );
  1851. transformSlides( { overview: '' } );
  1852. slide( indexh, indexv );
  1853. layout();
  1854. cueAutoSlide();
  1855. // Notify observers of the overview hiding
  1856. dispatchEvent( 'overviewhidden', {
  1857. 'indexh': indexh,
  1858. 'indexv': indexv,
  1859. 'currentSlide': currentSlide
  1860. } );
  1861. }
  1862. }
  1863. /**
  1864. * Toggles the slide overview mode on and off.
  1865. *
  1866. * @param {Boolean} [override] Flag which overrides the
  1867. * toggle logic and forcibly sets the desired state. True means
  1868. * overview is open, false means it's closed.
  1869. */
  1870. function toggleOverview( override ) {
  1871. if( typeof override === 'boolean' ) {
  1872. override ? activateOverview() : deactivateOverview();
  1873. }
  1874. else {
  1875. isOverview() ? deactivateOverview() : activateOverview();
  1876. }
  1877. }
  1878. /**
  1879. * Checks if the overview is currently active.
  1880. *
  1881. * @return {Boolean} true if the overview is active,
  1882. * false otherwise
  1883. */
  1884. function isOverview() {
  1885. return overview;
  1886. }
  1887. /**
  1888. * Return a hash URL that will resolve to the current slide location.
  1889. */
  1890. function locationHash() {
  1891. var url = '/';
  1892. // Attempt to create a named link based on the slide's ID
  1893. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  1894. if( id ) {
  1895. id = encodeURIComponent( id );
  1896. }
  1897. var indexf;
  1898. if( config.fragmentInURL ) {
  1899. indexf = getIndices().f;
  1900. }
  1901. // If the current slide has an ID, use that as a named link,
  1902. // but we don't support named links with a fragment index
  1903. if( typeof id === 'string' && id.length && indexf === undefined ) {
  1904. url = '/' + id;
  1905. }
  1906. // Otherwise use the /h/v index
  1907. else {
  1908. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  1909. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  1910. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  1911. if( indexf !== undefined ) url += '/' + indexf;
  1912. }
  1913. return url;
  1914. }
  1915. /**
  1916. * Checks if the current or specified slide is vertical
  1917. * (nested within another slide).
  1918. *
  1919. * @param {HTMLElement} [slide=currentSlide] The slide to check
  1920. * orientation of
  1921. * @return {Boolean}
  1922. */
  1923. function isVerticalSlide( slide ) {
  1924. // Prefer slide argument, otherwise use current slide
  1925. slide = slide ? slide : currentSlide;
  1926. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1927. }
  1928. /**
  1929. * Handling the fullscreen functionality via the fullscreen API
  1930. *
  1931. * @see http://fullscreen.spec.whatwg.org/
  1932. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1933. */
  1934. function enterFullscreen() {
  1935. var element = document.documentElement;
  1936. // Check which implementation is available
  1937. var requestMethod = element.requestFullscreen ||
  1938. element.webkitRequestFullscreen ||
  1939. element.webkitRequestFullScreen ||
  1940. element.mozRequestFullScreen ||
  1941. element.msRequestFullscreen;
  1942. if( requestMethod ) {
  1943. requestMethod.apply( element );
  1944. }
  1945. }
  1946. /**
  1947. * Shows the mouse pointer after it has been hidden with
  1948. * #hideCursor.
  1949. */
  1950. function showCursor() {
  1951. if( cursorHidden ) {
  1952. cursorHidden = false;
  1953. dom.wrapper.style.cursor = '';
  1954. }
  1955. }
  1956. /**
  1957. * Hides the mouse pointer when it's on top of the .reveal
  1958. * container.
  1959. */
  1960. function hideCursor() {
  1961. if( cursorHidden === false ) {
  1962. cursorHidden = true;
  1963. dom.wrapper.style.cursor = 'none';
  1964. }
  1965. }
  1966. /**
  1967. * Enters the paused mode which fades everything on screen to
  1968. * black.
  1969. */
  1970. function pause() {
  1971. if( config.pause ) {
  1972. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1973. cancelAutoSlide();
  1974. dom.wrapper.classList.add( 'paused' );
  1975. if( wasPaused === false ) {
  1976. dispatchEvent( 'paused' );
  1977. }
  1978. }
  1979. }
  1980. /**
  1981. * Exits from the paused mode.
  1982. */
  1983. function resume() {
  1984. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1985. dom.wrapper.classList.remove( 'paused' );
  1986. cueAutoSlide();
  1987. if( wasPaused ) {
  1988. dispatchEvent( 'resumed' );
  1989. }
  1990. }
  1991. /**
  1992. * Toggles the paused mode on and off.
  1993. */
  1994. function togglePause( override ) {
  1995. if( typeof override === 'boolean' ) {
  1996. override ? pause() : resume();
  1997. }
  1998. else {
  1999. isPaused() ? resume() : pause();
  2000. }
  2001. }
  2002. /**
  2003. * Checks if we are currently in the paused mode.
  2004. *
  2005. * @return {Boolean}
  2006. */
  2007. function isPaused() {
  2008. return dom.wrapper.classList.contains( 'paused' );
  2009. }
  2010. /**
  2011. * Toggles the auto slide mode on and off.
  2012. *
  2013. * @param {Boolean} [override] Flag which sets the desired state.
  2014. * True means autoplay starts, false means it stops.
  2015. */
  2016. function toggleAutoSlide( override ) {
  2017. if( typeof override === 'boolean' ) {
  2018. override ? resumeAutoSlide() : pauseAutoSlide();
  2019. }
  2020. else {
  2021. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2022. }
  2023. }
  2024. /**
  2025. * Checks if the auto slide mode is currently on.
  2026. *
  2027. * @return {Boolean}
  2028. */
  2029. function isAutoSliding() {
  2030. return !!( autoSlide && !autoSlidePaused );
  2031. }
  2032. /**
  2033. * Steps from the current point in the presentation to the
  2034. * slide which matches the specified horizontal and vertical
  2035. * indices.
  2036. *
  2037. * @param {number} [h=indexh] Horizontal index of the target slide
  2038. * @param {number} [v=indexv] Vertical index of the target slide
  2039. * @param {number} [f] Index of a fragment within the
  2040. * target slide to activate
  2041. * @param {number} [o] Origin for use in multimaster environments
  2042. */
  2043. function slide( h, v, f, o ) {
  2044. // Remember where we were at before
  2045. previousSlide = currentSlide;
  2046. // Query all horizontal slides in the deck
  2047. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2048. // Abort if there are no slides
  2049. if( horizontalSlides.length === 0 ) return;
  2050. // If no vertical index is specified and the upcoming slide is a
  2051. // stack, resume at its previous vertical index
  2052. if( v === undefined && !isOverview() ) {
  2053. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2054. }
  2055. // If we were on a vertical stack, remember what vertical index
  2056. // it was on so we can resume at the same position when returning
  2057. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2058. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2059. }
  2060. // Remember the state before this slide
  2061. var stateBefore = state.concat();
  2062. // Reset the state array
  2063. state.length = 0;
  2064. var indexhBefore = indexh || 0,
  2065. indexvBefore = indexv || 0;
  2066. // Activate and transition to the new slide
  2067. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2068. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2069. // Update the visibility of slides now that the indices have changed
  2070. updateSlidesVisibility();
  2071. layout();
  2072. // Update the overview if it's currently active
  2073. if( isOverview() ) {
  2074. updateOverview();
  2075. }
  2076. // Find the current horizontal slide and any possible vertical slides
  2077. // within it
  2078. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2079. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2080. // Store references to the previous and current slides
  2081. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2082. // Show fragment, if specified
  2083. if( typeof f !== 'undefined' ) {
  2084. navigateFragment( f );
  2085. }
  2086. // Dispatch an event if the slide changed
  2087. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2088. if (!slideChanged) {
  2089. // Ensure that the previous slide is never the same as the current
  2090. previousSlide = null;
  2091. }
  2092. // Solves an edge case where the previous slide maintains the
  2093. // 'present' class when navigating between adjacent vertical
  2094. // stacks
  2095. if( previousSlide && previousSlide !== currentSlide ) {
  2096. previousSlide.classList.remove( 'present' );
  2097. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2098. // Reset all slides upon navigate to home
  2099. // Issue: #285
  2100. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2101. // Launch async task
  2102. setTimeout( function () {
  2103. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2104. for( i in slides ) {
  2105. if( slides[i] ) {
  2106. // Reset stack
  2107. setPreviousVerticalIndex( slides[i], 0 );
  2108. }
  2109. }
  2110. }, 0 );
  2111. }
  2112. }
  2113. // Apply the new state
  2114. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2115. // Check if this state existed on the previous slide. If it
  2116. // did, we will avoid adding it repeatedly
  2117. for( var j = 0; j < stateBefore.length; j++ ) {
  2118. if( stateBefore[j] === state[i] ) {
  2119. stateBefore.splice( j, 1 );
  2120. continue stateLoop;
  2121. }
  2122. }
  2123. document.documentElement.classList.add( state[i] );
  2124. // Dispatch custom event matching the state's name
  2125. dispatchEvent( state[i] );
  2126. }
  2127. // Clean up the remains of the previous state
  2128. while( stateBefore.length ) {
  2129. document.documentElement.classList.remove( stateBefore.pop() );
  2130. }
  2131. if( slideChanged ) {
  2132. dispatchEvent( 'slidechanged', {
  2133. 'indexh': indexh,
  2134. 'indexv': indexv,
  2135. 'previousSlide': previousSlide,
  2136. 'currentSlide': currentSlide,
  2137. 'origin': o
  2138. } );
  2139. }
  2140. // Handle embedded content
  2141. if( slideChanged || !previousSlide ) {
  2142. stopEmbeddedContent( previousSlide );
  2143. startEmbeddedContent( currentSlide );
  2144. }
  2145. // Announce the current slide contents, for screen readers
  2146. dom.statusDiv.textContent = getStatusText( currentSlide );
  2147. updateControls();
  2148. updateProgress();
  2149. updateBackground();
  2150. updateParallax();
  2151. updateSlideNumber();
  2152. updateNotes();
  2153. updateFragments();
  2154. // Update the URL hash
  2155. writeURL();
  2156. cueAutoSlide();
  2157. }
  2158. /**
  2159. * Syncs the presentation with the current DOM. Useful
  2160. * when new slides or control elements are added or when
  2161. * the configuration has changed.
  2162. */
  2163. function sync() {
  2164. // Subscribe to input
  2165. removeEventListeners();
  2166. addEventListeners();
  2167. // Force a layout to make sure the current config is accounted for
  2168. layout();
  2169. // Reflect the current autoSlide value
  2170. autoSlide = config.autoSlide;
  2171. // Start auto-sliding if it's enabled
  2172. cueAutoSlide();
  2173. // Re-create the slide backgrounds
  2174. createBackgrounds();
  2175. // Write the current hash to the URL
  2176. writeURL();
  2177. sortAllFragments();
  2178. updateControls();
  2179. updateProgress();
  2180. updateSlideNumber();
  2181. updateSlidesVisibility();
  2182. updateBackground( true );
  2183. updateNotesVisibility();
  2184. updateNotes();
  2185. formatEmbeddedContent();
  2186. // Start or stop embedded content depending on global config
  2187. if( config.autoPlayMedia === false ) {
  2188. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2189. }
  2190. else {
  2191. startEmbeddedContent( currentSlide );
  2192. }
  2193. if( isOverview() ) {
  2194. layoutOverview();
  2195. }
  2196. }
  2197. /**
  2198. * Updates reveal.js to keep in sync with new slide attributes. For
  2199. * example, if you add a new `data-background-image` you can call
  2200. * this to have reveal.js render the new background image.
  2201. *
  2202. * Similar to #sync() but more efficient when you only need to
  2203. * refresh a specific slide.
  2204. *
  2205. * @param {HTMLElement} slide
  2206. */
  2207. function syncSlide( slide ) {
  2208. syncBackground( slide );
  2209. syncFragments( slide );
  2210. updateBackground();
  2211. updateNotes();
  2212. loadSlide( slide );
  2213. }
  2214. /**
  2215. * Formats the fragments on the given slide so that they have
  2216. * valid indices. Call this if fragments are changed in the DOM
  2217. * after reveal.js has already initialized.
  2218. *
  2219. * @param {HTMLElement} slide
  2220. */
  2221. function syncFragments( slide ) {
  2222. sortFragments( slide.querySelectorAll( '.fragment' ) );
  2223. }
  2224. /**
  2225. * Resets all vertical slides so that only the first
  2226. * is visible.
  2227. */
  2228. function resetVerticalSlides() {
  2229. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2230. horizontalSlides.forEach( function( horizontalSlide ) {
  2231. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2232. verticalSlides.forEach( function( verticalSlide, y ) {
  2233. if( y > 0 ) {
  2234. verticalSlide.classList.remove( 'present' );
  2235. verticalSlide.classList.remove( 'past' );
  2236. verticalSlide.classList.add( 'future' );
  2237. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2238. }
  2239. } );
  2240. } );
  2241. }
  2242. /**
  2243. * Sorts and formats all of fragments in the
  2244. * presentation.
  2245. */
  2246. function sortAllFragments() {
  2247. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2248. horizontalSlides.forEach( function( horizontalSlide ) {
  2249. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2250. verticalSlides.forEach( function( verticalSlide, y ) {
  2251. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2252. } );
  2253. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2254. } );
  2255. }
  2256. /**
  2257. * Randomly shuffles all slides in the deck.
  2258. */
  2259. function shuffle() {
  2260. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2261. slides.forEach( function( slide ) {
  2262. // Insert this slide next to another random slide. This may
  2263. // cause the slide to insert before itself but that's fine.
  2264. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2265. } );
  2266. }
  2267. /**
  2268. * Updates one dimension of slides by showing the slide
  2269. * with the specified index.
  2270. *
  2271. * @param {string} selector A CSS selector that will fetch
  2272. * the group of slides we are working with
  2273. * @param {number} index The index of the slide that should be
  2274. * shown
  2275. *
  2276. * @return {number} The index of the slide that is now shown,
  2277. * might differ from the passed in index if it was out of
  2278. * bounds.
  2279. */
  2280. function updateSlides( selector, index ) {
  2281. // Select all slides and convert the NodeList result to
  2282. // an array
  2283. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2284. slidesLength = slides.length;
  2285. var printMode = isPrintingPDF();
  2286. if( slidesLength ) {
  2287. // Should the index loop?
  2288. if( config.loop ) {
  2289. index %= slidesLength;
  2290. if( index < 0 ) {
  2291. index = slidesLength + index;
  2292. }
  2293. }
  2294. // Enforce max and minimum index bounds
  2295. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2296. for( var i = 0; i < slidesLength; i++ ) {
  2297. var element = slides[i];
  2298. var reverse = config.rtl && !isVerticalSlide( element );
  2299. element.classList.remove( 'past' );
  2300. element.classList.remove( 'present' );
  2301. element.classList.remove( 'future' );
  2302. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2303. element.setAttribute( 'hidden', '' );
  2304. element.setAttribute( 'aria-hidden', 'true' );
  2305. // If this element contains vertical slides
  2306. if( element.querySelector( 'section' ) ) {
  2307. element.classList.add( 'stack' );
  2308. }
  2309. // If we're printing static slides, all slides are "present"
  2310. if( printMode ) {
  2311. element.classList.add( 'present' );
  2312. continue;
  2313. }
  2314. if( i < index ) {
  2315. // Any element previous to index is given the 'past' class
  2316. element.classList.add( reverse ? 'future' : 'past' );
  2317. if( config.fragments ) {
  2318. // Show all fragments in prior slides
  2319. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2320. fragment.classList.add( 'visible' );
  2321. fragment.classList.remove( 'current-fragment' );
  2322. } );
  2323. }
  2324. }
  2325. else if( i > index ) {
  2326. // Any element subsequent to index is given the 'future' class
  2327. element.classList.add( reverse ? 'past' : 'future' );
  2328. if( config.fragments ) {
  2329. // Hide all fragments in future slides
  2330. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2331. fragment.classList.remove( 'visible' );
  2332. fragment.classList.remove( 'current-fragment' );
  2333. } );
  2334. }
  2335. }
  2336. }
  2337. // Mark the current slide as present
  2338. slides[index].classList.add( 'present' );
  2339. slides[index].removeAttribute( 'hidden' );
  2340. slides[index].removeAttribute( 'aria-hidden' );
  2341. // If this slide has a state associated with it, add it
  2342. // onto the current state of the deck
  2343. var slideState = slides[index].getAttribute( 'data-state' );
  2344. if( slideState ) {
  2345. state = state.concat( slideState.split( ' ' ) );
  2346. }
  2347. }
  2348. else {
  2349. // Since there are no slides we can't be anywhere beyond the
  2350. // zeroth index
  2351. index = 0;
  2352. }
  2353. return index;
  2354. }
  2355. /**
  2356. * Optimization method; hide all slides that are far away
  2357. * from the present slide.
  2358. */
  2359. function updateSlidesVisibility() {
  2360. // Select all slides and convert the NodeList result to
  2361. // an array
  2362. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2363. horizontalSlidesLength = horizontalSlides.length,
  2364. distanceX,
  2365. distanceY;
  2366. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2367. // The number of steps away from the present slide that will
  2368. // be visible
  2369. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2370. // Limit view distance on weaker devices
  2371. if( isMobileDevice ) {
  2372. viewDistance = isOverview() ? 6 : 2;
  2373. }
  2374. // All slides need to be visible when exporting to PDF
  2375. if( isPrintingPDF() ) {
  2376. viewDistance = Number.MAX_VALUE;
  2377. }
  2378. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2379. var horizontalSlide = horizontalSlides[x];
  2380. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2381. verticalSlidesLength = verticalSlides.length;
  2382. // Determine how far away this slide is from the present
  2383. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2384. // If the presentation is looped, distance should measure
  2385. // 1 between the first and last slides
  2386. if( config.loop ) {
  2387. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2388. }
  2389. // Show the horizontal slide if it's within the view distance
  2390. if( distanceX < viewDistance ) {
  2391. loadSlide( horizontalSlide );
  2392. }
  2393. else {
  2394. unloadSlide( horizontalSlide );
  2395. }
  2396. if( verticalSlidesLength ) {
  2397. var oy = getPreviousVerticalIndex( horizontalSlide );
  2398. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2399. var verticalSlide = verticalSlides[y];
  2400. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2401. if( distanceX + distanceY < viewDistance ) {
  2402. loadSlide( verticalSlide );
  2403. }
  2404. else {
  2405. unloadSlide( verticalSlide );
  2406. }
  2407. }
  2408. }
  2409. }
  2410. // Flag if there are ANY vertical slides, anywhere in the deck
  2411. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2412. dom.wrapper.classList.add( 'has-vertical-slides' );
  2413. }
  2414. else {
  2415. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2416. }
  2417. // Flag if there are ANY horizontal slides, anywhere in the deck
  2418. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2419. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2420. }
  2421. else {
  2422. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2423. }
  2424. }
  2425. }
  2426. /**
  2427. * Pick up notes from the current slide and display them
  2428. * to the viewer.
  2429. *
  2430. * @see {@link config.showNotes}
  2431. */
  2432. function updateNotes() {
  2433. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2434. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2435. }
  2436. }
  2437. /**
  2438. * Updates the visibility of the speaker notes sidebar that
  2439. * is used to share annotated slides. The notes sidebar is
  2440. * only visible if showNotes is true and there are notes on
  2441. * one or more slides in the deck.
  2442. */
  2443. function updateNotesVisibility() {
  2444. if( config.showNotes && hasNotes() ) {
  2445. dom.wrapper.classList.add( 'show-notes' );
  2446. }
  2447. else {
  2448. dom.wrapper.classList.remove( 'show-notes' );
  2449. }
  2450. }
  2451. /**
  2452. * Checks if there are speaker notes for ANY slide in the
  2453. * presentation.
  2454. */
  2455. function hasNotes() {
  2456. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2457. }
  2458. /**
  2459. * Updates the progress bar to reflect the current slide.
  2460. */
  2461. function updateProgress() {
  2462. // Update progress if enabled
  2463. if( config.progress && dom.progressbar ) {
  2464. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2465. }
  2466. }
  2467. /**
  2468. * Updates the slide number div to reflect the current slide.
  2469. *
  2470. * The following slide number formats are available:
  2471. * "h.v": horizontal . vertical slide number (default)
  2472. * "h/v": horizontal / vertical slide number
  2473. * "c": flattened slide number
  2474. * "c/t": flattened slide number / total slides
  2475. */
  2476. function updateSlideNumber() {
  2477. // Update slide number if enabled
  2478. if( config.slideNumber && dom.slideNumber ) {
  2479. var value = [];
  2480. var format = 'h.v';
  2481. // Check if a custom number format is available
  2482. if( typeof config.slideNumber === 'string' ) {
  2483. format = config.slideNumber;
  2484. }
  2485. // If there are ONLY vertical slides in this deck, always use
  2486. // a flattened slide number
  2487. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2488. format = 'c';
  2489. }
  2490. switch( format ) {
  2491. case 'c':
  2492. value.push( getSlidePastCount() + 1 );
  2493. break;
  2494. case 'c/t':
  2495. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2496. break;
  2497. case 'h/v':
  2498. value.push( indexh + 1 );
  2499. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2500. break;
  2501. default:
  2502. value.push( indexh + 1 );
  2503. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2504. }
  2505. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2506. }
  2507. }
  2508. /**
  2509. * Applies HTML formatting to a slide number before it's
  2510. * written to the DOM.
  2511. *
  2512. * @param {number} a Current slide
  2513. * @param {string} delimiter Character to separate slide numbers
  2514. * @param {(number|*)} b Total slides
  2515. * @return {string} HTML string fragment
  2516. */
  2517. function formatSlideNumber( a, delimiter, b ) {
  2518. var url = '#' + locationHash();
  2519. if( typeof b === 'number' && !isNaN( b ) ) {
  2520. return '<a href="' + url + '">' +
  2521. '<span class="slide-number-a">'+ a +'</span>' +
  2522. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2523. '<span class="slide-number-b">'+ b +'</span>' +
  2524. '</a>';
  2525. }
  2526. else {
  2527. return '<a href="' + url + '">' +
  2528. '<span class="slide-number-a">'+ a +'</span>' +
  2529. '</a>';
  2530. }
  2531. }
  2532. /**
  2533. * Updates the state of all control/navigation arrows.
  2534. */
  2535. function updateControls() {
  2536. var routes = availableRoutes();
  2537. var fragments = availableFragments();
  2538. // Remove the 'enabled' class from all directions
  2539. dom.controlsLeft.concat( dom.controlsRight )
  2540. .concat( dom.controlsUp )
  2541. .concat( dom.controlsDown )
  2542. .concat( dom.controlsPrev )
  2543. .concat( dom.controlsNext ).forEach( function( node ) {
  2544. node.classList.remove( 'enabled' );
  2545. node.classList.remove( 'fragmented' );
  2546. // Set 'disabled' attribute on all directions
  2547. node.setAttribute( 'disabled', 'disabled' );
  2548. } );
  2549. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2550. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2551. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2552. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2553. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2554. // Prev/next buttons
  2555. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2556. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2557. // Highlight fragment directions
  2558. if( currentSlide ) {
  2559. // Always apply fragment decorator to prev/next buttons
  2560. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2561. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2562. // Apply fragment decorators to directional buttons based on
  2563. // what slide axis they are in
  2564. if( isVerticalSlide( currentSlide ) ) {
  2565. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2566. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2567. }
  2568. else {
  2569. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2570. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2571. }
  2572. }
  2573. if( config.controlsTutorial ) {
  2574. // Highlight control arrows with an animation to ensure
  2575. // that the viewer knows how to navigate
  2576. if( !hasNavigatedDown && routes.down ) {
  2577. dom.controlsDownArrow.classList.add( 'highlight' );
  2578. }
  2579. else {
  2580. dom.controlsDownArrow.classList.remove( 'highlight' );
  2581. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2582. dom.controlsRightArrow.classList.add( 'highlight' );
  2583. }
  2584. else {
  2585. dom.controlsRightArrow.classList.remove( 'highlight' );
  2586. }
  2587. }
  2588. }
  2589. }
  2590. /**
  2591. * Updates the background elements to reflect the current
  2592. * slide.
  2593. *
  2594. * @param {boolean} includeAll If true, the backgrounds of
  2595. * all vertical slides (not just the present) will be updated.
  2596. */
  2597. function updateBackground( includeAll ) {
  2598. var currentBackground = null;
  2599. // Reverse past/future classes when in RTL mode
  2600. var horizontalPast = config.rtl ? 'future' : 'past',
  2601. horizontalFuture = config.rtl ? 'past' : 'future';
  2602. // Update the classes of all backgrounds to match the
  2603. // states of their slides (past/present/future)
  2604. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2605. backgroundh.classList.remove( 'past' );
  2606. backgroundh.classList.remove( 'present' );
  2607. backgroundh.classList.remove( 'future' );
  2608. if( h < indexh ) {
  2609. backgroundh.classList.add( horizontalPast );
  2610. }
  2611. else if ( h > indexh ) {
  2612. backgroundh.classList.add( horizontalFuture );
  2613. }
  2614. else {
  2615. backgroundh.classList.add( 'present' );
  2616. // Store a reference to the current background element
  2617. currentBackground = backgroundh;
  2618. }
  2619. if( includeAll || h === indexh ) {
  2620. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2621. backgroundv.classList.remove( 'past' );
  2622. backgroundv.classList.remove( 'present' );
  2623. backgroundv.classList.remove( 'future' );
  2624. if( v < indexv ) {
  2625. backgroundv.classList.add( 'past' );
  2626. }
  2627. else if ( v > indexv ) {
  2628. backgroundv.classList.add( 'future' );
  2629. }
  2630. else {
  2631. backgroundv.classList.add( 'present' );
  2632. // Only if this is the present horizontal and vertical slide
  2633. if( h === indexh ) currentBackground = backgroundv;
  2634. }
  2635. } );
  2636. }
  2637. } );
  2638. // Stop content inside of previous backgrounds
  2639. if( previousBackground ) {
  2640. stopEmbeddedContent( previousBackground );
  2641. }
  2642. // Start content in the current background
  2643. if( currentBackground ) {
  2644. startEmbeddedContent( currentBackground );
  2645. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2646. if( currentBackgroundContent ) {
  2647. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2648. // Restart GIFs (doesn't work in Firefox)
  2649. if( /\.gif/i.test( backgroundImageURL ) ) {
  2650. currentBackgroundContent.style.backgroundImage = '';
  2651. window.getComputedStyle( currentBackgroundContent ).opacity;
  2652. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2653. }
  2654. }
  2655. // Don't transition between identical backgrounds. This
  2656. // prevents unwanted flicker.
  2657. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2658. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2659. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2660. dom.background.classList.add( 'no-transition' );
  2661. }
  2662. previousBackground = currentBackground;
  2663. }
  2664. // If there's a background brightness flag for this slide,
  2665. // bubble it to the .reveal container
  2666. if( currentSlide ) {
  2667. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2668. if( currentSlide.classList.contains( classToBubble ) ) {
  2669. dom.wrapper.classList.add( classToBubble );
  2670. }
  2671. else {
  2672. dom.wrapper.classList.remove( classToBubble );
  2673. }
  2674. } );
  2675. }
  2676. // Allow the first background to apply without transition
  2677. setTimeout( function() {
  2678. dom.background.classList.remove( 'no-transition' );
  2679. }, 1 );
  2680. }
  2681. /**
  2682. * Updates the position of the parallax background based
  2683. * on the current slide index.
  2684. */
  2685. function updateParallax() {
  2686. if( config.parallaxBackgroundImage ) {
  2687. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2688. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2689. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2690. backgroundWidth, backgroundHeight;
  2691. if( backgroundSize.length === 1 ) {
  2692. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2693. }
  2694. else {
  2695. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2696. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2697. }
  2698. var slideWidth = dom.background.offsetWidth,
  2699. horizontalSlideCount = horizontalSlides.length,
  2700. horizontalOffsetMultiplier,
  2701. horizontalOffset;
  2702. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2703. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2704. }
  2705. else {
  2706. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2707. }
  2708. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2709. var slideHeight = dom.background.offsetHeight,
  2710. verticalSlideCount = verticalSlides.length,
  2711. verticalOffsetMultiplier,
  2712. verticalOffset;
  2713. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2714. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2715. }
  2716. else {
  2717. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2718. }
  2719. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2720. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2721. }
  2722. }
  2723. /**
  2724. * Called when the given slide is within the configured view
  2725. * distance. Shows the slide element and loads any content
  2726. * that is set to load lazily (data-src).
  2727. *
  2728. * @param {HTMLElement} slide Slide to show
  2729. */
  2730. function loadSlide( slide, options ) {
  2731. options = options || {};
  2732. // Show the slide element
  2733. slide.style.display = config.display;
  2734. // Media elements with data-src attributes
  2735. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2736. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2737. element.setAttribute( 'data-lazy-loaded', '' );
  2738. element.removeAttribute( 'data-src' );
  2739. } );
  2740. // Media elements with <source> children
  2741. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2742. var sources = 0;
  2743. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2744. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2745. source.removeAttribute( 'data-src' );
  2746. source.setAttribute( 'data-lazy-loaded', '' );
  2747. sources += 1;
  2748. } );
  2749. // If we rewrote sources for this video/audio element, we need
  2750. // to manually tell it to load from its new origin
  2751. if( sources > 0 ) {
  2752. media.load();
  2753. }
  2754. } );
  2755. // Show the corresponding background element
  2756. var background = slide.slideBackgroundElement;
  2757. if( background ) {
  2758. background.style.display = 'block';
  2759. var backgroundContent = slide.slideBackgroundContentElement;
  2760. // If the background contains media, load it
  2761. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2762. background.setAttribute( 'data-loaded', 'true' );
  2763. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2764. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2765. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2766. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2767. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2768. // Images
  2769. if( backgroundImage ) {
  2770. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2771. }
  2772. // Videos
  2773. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2774. var video = document.createElement( 'video' );
  2775. if( backgroundVideoLoop ) {
  2776. video.setAttribute( 'loop', '' );
  2777. }
  2778. if( backgroundVideoMuted ) {
  2779. video.muted = true;
  2780. }
  2781. // Inline video playback works (at least in Mobile Safari) as
  2782. // long as the video is muted and the `playsinline` attribute is
  2783. // present
  2784. if( isMobileDevice ) {
  2785. video.muted = true;
  2786. video.autoplay = true;
  2787. video.setAttribute( 'playsinline', '' );
  2788. }
  2789. // Support comma separated lists of video sources
  2790. backgroundVideo.split( ',' ).forEach( function( source ) {
  2791. video.innerHTML += '<source src="'+ source +'">';
  2792. } );
  2793. backgroundContent.appendChild( video );
  2794. }
  2795. // Iframes
  2796. else if( backgroundIframe && options.excludeIframes !== true ) {
  2797. var iframe = document.createElement( 'iframe' );
  2798. iframe.setAttribute( 'allowfullscreen', '' );
  2799. iframe.setAttribute( 'mozallowfullscreen', '' );
  2800. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2801. // Only load autoplaying content when the slide is shown to
  2802. // avoid having it play in the background
  2803. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2804. iframe.setAttribute( 'data-src', backgroundIframe );
  2805. }
  2806. else {
  2807. iframe.setAttribute( 'src', backgroundIframe );
  2808. }
  2809. iframe.style.width = '100%';
  2810. iframe.style.height = '100%';
  2811. iframe.style.maxHeight = '100%';
  2812. iframe.style.maxWidth = '100%';
  2813. backgroundContent.appendChild( iframe );
  2814. }
  2815. }
  2816. }
  2817. }
  2818. /**
  2819. * Unloads and hides the given slide. This is called when the
  2820. * slide is moved outside of the configured view distance.
  2821. *
  2822. * @param {HTMLElement} slide
  2823. */
  2824. function unloadSlide( slide ) {
  2825. // Hide the slide element
  2826. slide.style.display = 'none';
  2827. // Hide the corresponding background element
  2828. var background = getSlideBackground( slide );
  2829. if( background ) {
  2830. background.style.display = 'none';
  2831. }
  2832. // Reset lazy-loaded media elements with src attributes
  2833. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  2834. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  2835. element.removeAttribute( 'src' );
  2836. } );
  2837. // Reset lazy-loaded media elements with <source> children
  2838. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  2839. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  2840. source.removeAttribute( 'src' );
  2841. } );
  2842. }
  2843. /**
  2844. * Determine what available routes there are for navigation.
  2845. *
  2846. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  2847. */
  2848. function availableRoutes() {
  2849. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2850. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2851. var routes = {
  2852. left: indexh > 0,
  2853. right: indexh < horizontalSlides.length - 1,
  2854. up: indexv > 0,
  2855. down: indexv < verticalSlides.length - 1
  2856. };
  2857. // Looped presentations can always be navigated as long as
  2858. // there are slides available
  2859. if( config.loop ) {
  2860. if( horizontalSlides.length > 1 ) {
  2861. routes.left = true;
  2862. routes.right = true;
  2863. }
  2864. if( verticalSlides.length > 1 ) {
  2865. routes.up = true;
  2866. routes.down = true;
  2867. }
  2868. }
  2869. // Reverse horizontal controls for rtl
  2870. if( config.rtl ) {
  2871. var left = routes.left;
  2872. routes.left = routes.right;
  2873. routes.right = left;
  2874. }
  2875. return routes;
  2876. }
  2877. /**
  2878. * Returns an object describing the available fragment
  2879. * directions.
  2880. *
  2881. * @return {{prev: boolean, next: boolean}}
  2882. */
  2883. function availableFragments() {
  2884. if( currentSlide && config.fragments ) {
  2885. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2886. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2887. return {
  2888. prev: fragments.length - hiddenFragments.length > 0,
  2889. next: !!hiddenFragments.length
  2890. };
  2891. }
  2892. else {
  2893. return { prev: false, next: false };
  2894. }
  2895. }
  2896. /**
  2897. * Enforces origin-specific format rules for embedded media.
  2898. */
  2899. function formatEmbeddedContent() {
  2900. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2901. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2902. var src = el.getAttribute( sourceAttribute );
  2903. if( src && src.indexOf( param ) === -1 ) {
  2904. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2905. }
  2906. });
  2907. };
  2908. // YouTube frames must include "?enablejsapi=1"
  2909. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2910. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2911. // Vimeo frames must include "?api=1"
  2912. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2913. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2914. // Always show media controls on mobile devices
  2915. if( isMobileDevice ) {
  2916. toArray( dom.slides.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2917. el.controls = true;
  2918. } );
  2919. }
  2920. }
  2921. /**
  2922. * Start playback of any embedded content inside of
  2923. * the given element.
  2924. *
  2925. * @param {HTMLElement} element
  2926. */
  2927. function startEmbeddedContent( element ) {
  2928. if( element && !isSpeakerNotes() ) {
  2929. // Restart GIFs
  2930. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  2931. // Setting the same unchanged source like this was confirmed
  2932. // to work in Chrome, FF & Safari
  2933. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  2934. } );
  2935. // HTML5 media elements
  2936. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2937. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2938. return;
  2939. }
  2940. // Prefer an explicit global autoplay setting
  2941. var autoplay = config.autoPlayMedia;
  2942. // If no global setting is available, fall back on the element's
  2943. // own autoplay setting
  2944. if( typeof autoplay !== 'boolean' ) {
  2945. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  2946. }
  2947. if( autoplay && typeof el.play === 'function' ) {
  2948. // If the media is ready, start playback
  2949. if( el.readyState > 1 ) {
  2950. startEmbeddedMedia( { target: el } );
  2951. }
  2952. // Mobile devices never fire a loaded event so instead
  2953. // of waiting, we initiate playback
  2954. else if( isMobileDevice ) {
  2955. el.play();
  2956. }
  2957. // If the media isn't loaded, wait before playing
  2958. else {
  2959. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  2960. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  2961. }
  2962. }
  2963. } );
  2964. // Normal iframes
  2965. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  2966. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2967. return;
  2968. }
  2969. startEmbeddedIframe( { target: el } );
  2970. } );
  2971. // Lazy loading iframes
  2972. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2973. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2974. return;
  2975. }
  2976. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  2977. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  2978. el.addEventListener( 'load', startEmbeddedIframe );
  2979. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  2980. }
  2981. } );
  2982. }
  2983. }
  2984. /**
  2985. * Starts playing an embedded video/audio element after
  2986. * it has finished loading.
  2987. *
  2988. * @param {object} event
  2989. */
  2990. function startEmbeddedMedia( event ) {
  2991. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  2992. isVisible = !!closestParent( event.target, '.present' );
  2993. if( isAttachedToDOM && isVisible ) {
  2994. event.target.currentTime = 0;
  2995. event.target.play();
  2996. }
  2997. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  2998. }
  2999. /**
  3000. * "Starts" the content of an embedded iframe using the
  3001. * postMessage API.
  3002. *
  3003. * @param {object} event
  3004. */
  3005. function startEmbeddedIframe( event ) {
  3006. var iframe = event.target;
  3007. if( iframe && iframe.contentWindow ) {
  3008. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3009. isVisible = !!closestParent( event.target, '.present' );
  3010. if( isAttachedToDOM && isVisible ) {
  3011. // Prefer an explicit global autoplay setting
  3012. var autoplay = config.autoPlayMedia;
  3013. // If no global setting is available, fall back on the element's
  3014. // own autoplay setting
  3015. if( typeof autoplay !== 'boolean' ) {
  3016. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3017. }
  3018. // YouTube postMessage API
  3019. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3020. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3021. }
  3022. // Vimeo postMessage API
  3023. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3024. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3025. }
  3026. // Generic postMessage API
  3027. else {
  3028. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3029. }
  3030. }
  3031. }
  3032. }
  3033. /**
  3034. * Stop playback of any embedded content inside of
  3035. * the targeted slide.
  3036. *
  3037. * @param {HTMLElement} element
  3038. */
  3039. function stopEmbeddedContent( element, options ) {
  3040. options = extend( {
  3041. // Defaults
  3042. unloadIframes: true
  3043. }, options || {} );
  3044. if( element && element.parentNode ) {
  3045. // HTML5 media elements
  3046. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3047. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3048. el.setAttribute('data-paused-by-reveal', '');
  3049. el.pause();
  3050. }
  3051. } );
  3052. // Generic postMessage API for non-lazy loaded iframes
  3053. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3054. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3055. el.removeEventListener( 'load', startEmbeddedIframe );
  3056. });
  3057. // YouTube postMessage API
  3058. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3059. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3060. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3061. }
  3062. });
  3063. // Vimeo postMessage API
  3064. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3065. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3066. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3067. }
  3068. });
  3069. if( options.unloadIframes === true ) {
  3070. // Unload lazy-loaded iframes
  3071. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3072. // Only removing the src doesn't actually unload the frame
  3073. // in all browsers (Firefox) so we set it to blank first
  3074. el.setAttribute( 'src', 'about:blank' );
  3075. el.removeAttribute( 'src' );
  3076. } );
  3077. }
  3078. }
  3079. }
  3080. /**
  3081. * Returns the number of past slides. This can be used as a global
  3082. * flattened index for slides.
  3083. *
  3084. * @return {number} Past slide count
  3085. */
  3086. function getSlidePastCount() {
  3087. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3088. // The number of past slides
  3089. var pastCount = 0;
  3090. // Step through all slides and count the past ones
  3091. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3092. var horizontalSlide = horizontalSlides[i];
  3093. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3094. for( var j = 0; j < verticalSlides.length; j++ ) {
  3095. // Stop as soon as we arrive at the present
  3096. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3097. break mainLoop;
  3098. }
  3099. pastCount++;
  3100. }
  3101. // Stop as soon as we arrive at the present
  3102. if( horizontalSlide.classList.contains( 'present' ) ) {
  3103. break;
  3104. }
  3105. // Don't count the wrapping section for vertical slides
  3106. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3107. pastCount++;
  3108. }
  3109. }
  3110. return pastCount;
  3111. }
  3112. /**
  3113. * Returns a value ranging from 0-1 that represents
  3114. * how far into the presentation we have navigated.
  3115. *
  3116. * @return {number}
  3117. */
  3118. function getProgress() {
  3119. // The number of past and total slides
  3120. var totalCount = getTotalSlides();
  3121. var pastCount = getSlidePastCount();
  3122. if( currentSlide ) {
  3123. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3124. // If there are fragments in the current slide those should be
  3125. // accounted for in the progress.
  3126. if( allFragments.length > 0 ) {
  3127. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3128. // This value represents how big a portion of the slide progress
  3129. // that is made up by its fragments (0-1)
  3130. var fragmentWeight = 0.9;
  3131. // Add fragment progress to the past slide count
  3132. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3133. }
  3134. }
  3135. return pastCount / ( totalCount - 1 );
  3136. }
  3137. /**
  3138. * Checks if this presentation is running inside of the
  3139. * speaker notes window.
  3140. *
  3141. * @return {boolean}
  3142. */
  3143. function isSpeakerNotes() {
  3144. return !!window.location.search.match( /receiver/gi );
  3145. }
  3146. /**
  3147. * Reads the current URL (hash) and navigates accordingly.
  3148. */
  3149. function readURL() {
  3150. var hash = window.location.hash;
  3151. // Attempt to parse the hash as either an index or name
  3152. var bits = hash.slice( 2 ).split( '/' ),
  3153. name = hash.replace( /#|\//gi, '' );
  3154. // If the first bit is not fully numeric and there is a name we
  3155. // can assume that this is a named link
  3156. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3157. var element;
  3158. // Ensure the named link is a valid HTML ID attribute
  3159. try {
  3160. element = document.getElementById( decodeURIComponent( name ) );
  3161. }
  3162. catch ( error ) { }
  3163. // Ensure that we're not already on a slide with the same name
  3164. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3165. if( element ) {
  3166. // If the slide exists and is not the current slide...
  3167. if ( !isSameNameAsCurrentSlide ) {
  3168. // ...find the position of the named slide and navigate to it
  3169. var indices = Reveal.getIndices(element);
  3170. slide(indices.h, indices.v);
  3171. }
  3172. }
  3173. // If the slide doesn't exist, navigate to the current slide
  3174. else {
  3175. slide( indexh || 0, indexv || 0 );
  3176. }
  3177. }
  3178. else {
  3179. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3180. // Read the index components of the hash
  3181. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3182. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3183. f;
  3184. if( config.fragmentInURL ) {
  3185. f = parseInt( bits[2], 10 );
  3186. if( isNaN( f ) ) {
  3187. f = undefined;
  3188. }
  3189. }
  3190. if( h !== indexh || v !== indexv || f !== undefined ) {
  3191. slide( h, v, f );
  3192. }
  3193. }
  3194. }
  3195. /**
  3196. * Updates the page URL (hash) to reflect the current
  3197. * state.
  3198. *
  3199. * @param {number} delay The time in ms to wait before
  3200. * writing the hash
  3201. */
  3202. function writeURL( delay ) {
  3203. // Make sure there's never more than one timeout running
  3204. clearTimeout( writeURLTimeout );
  3205. // If a delay is specified, timeout this call
  3206. if( typeof delay === 'number' ) {
  3207. writeURLTimeout = setTimeout( writeURL, delay );
  3208. }
  3209. else if( currentSlide ) {
  3210. if ( config.history ) {
  3211. window.location.hash = locationHash();
  3212. }
  3213. else if ( config.hash ) {
  3214. window.history.replaceState(null, null, '#' + locationHash());
  3215. }
  3216. }
  3217. }
  3218. /**
  3219. * Retrieves the h/v location and fragment of the current,
  3220. * or specified, slide.
  3221. *
  3222. * @param {HTMLElement} [slide] If specified, the returned
  3223. * index will be for this slide rather than the currently
  3224. * active one
  3225. *
  3226. * @return {{h: number, v: number, f: number}}
  3227. */
  3228. function getIndices( slide ) {
  3229. // By default, return the current indices
  3230. var h = indexh,
  3231. v = indexv,
  3232. f;
  3233. // If a slide is specified, return the indices of that slide
  3234. if( slide ) {
  3235. var isVertical = isVerticalSlide( slide );
  3236. var slideh = isVertical ? slide.parentNode : slide;
  3237. // Select all horizontal slides
  3238. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3239. // Now that we know which the horizontal slide is, get its index
  3240. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3241. // Assume we're not vertical
  3242. v = undefined;
  3243. // If this is a vertical slide, grab the vertical index
  3244. if( isVertical ) {
  3245. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3246. }
  3247. }
  3248. if( !slide && currentSlide ) {
  3249. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3250. if( hasFragments ) {
  3251. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3252. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3253. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3254. }
  3255. else {
  3256. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3257. }
  3258. }
  3259. }
  3260. return { h: h, v: v, f: f };
  3261. }
  3262. /**
  3263. * Retrieves all slides in this presentation.
  3264. */
  3265. function getSlides() {
  3266. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3267. }
  3268. /**
  3269. * Returns an array of objects where each object represents the
  3270. * attributes on its respective slide.
  3271. */
  3272. function getSlidesAttributes() {
  3273. return getSlides().map( function( slide ) {
  3274. var attributes = {};
  3275. for( var i = 0; i < slide.attributes.length; i++ ) {
  3276. var attribute = slide.attributes[ i ];
  3277. attributes[ attribute.name ] = attribute.value;
  3278. }
  3279. return attributes;
  3280. } );
  3281. }
  3282. /**
  3283. * Retrieves the total number of slides in this presentation.
  3284. *
  3285. * @return {number}
  3286. */
  3287. function getTotalSlides() {
  3288. return getSlides().length;
  3289. }
  3290. /**
  3291. * Returns the slide element matching the specified index.
  3292. *
  3293. * @return {HTMLElement}
  3294. */
  3295. function getSlide( x, y ) {
  3296. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3297. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3298. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3299. return verticalSlides ? verticalSlides[ y ] : undefined;
  3300. }
  3301. return horizontalSlide;
  3302. }
  3303. /**
  3304. * Returns the background element for the given slide.
  3305. * All slides, even the ones with no background properties
  3306. * defined, have a background element so as long as the
  3307. * index is valid an element will be returned.
  3308. *
  3309. * @param {mixed} x Horizontal background index OR a slide
  3310. * HTML element
  3311. * @param {number} y Vertical background index
  3312. * @return {(HTMLElement[]|*)}
  3313. */
  3314. function getSlideBackground( x, y ) {
  3315. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3316. if( slide ) {
  3317. return slide.slideBackgroundElement;
  3318. }
  3319. return undefined;
  3320. }
  3321. /**
  3322. * Retrieves the speaker notes from a slide. Notes can be
  3323. * defined in two ways:
  3324. * 1. As a data-notes attribute on the slide <section>
  3325. * 2. As an <aside class="notes"> inside of the slide
  3326. *
  3327. * @param {HTMLElement} [slide=currentSlide]
  3328. * @return {(string|null)}
  3329. */
  3330. function getSlideNotes( slide ) {
  3331. // Default to the current slide
  3332. slide = slide || currentSlide;
  3333. // Notes can be specified via the data-notes attribute...
  3334. if( slide.hasAttribute( 'data-notes' ) ) {
  3335. return slide.getAttribute( 'data-notes' );
  3336. }
  3337. // ... or using an <aside class="notes"> element
  3338. var notesElement = slide.querySelector( 'aside.notes' );
  3339. if( notesElement ) {
  3340. return notesElement.innerHTML;
  3341. }
  3342. return null;
  3343. }
  3344. /**
  3345. * Retrieves the current state of the presentation as
  3346. * an object. This state can then be restored at any
  3347. * time.
  3348. *
  3349. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3350. */
  3351. function getState() {
  3352. var indices = getIndices();
  3353. return {
  3354. indexh: indices.h,
  3355. indexv: indices.v,
  3356. indexf: indices.f,
  3357. paused: isPaused(),
  3358. overview: isOverview()
  3359. };
  3360. }
  3361. /**
  3362. * Restores the presentation to the given state.
  3363. *
  3364. * @param {object} state As generated by getState()
  3365. * @see {@link getState} generates the parameter `state`
  3366. */
  3367. function setState( state ) {
  3368. if( typeof state === 'object' ) {
  3369. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3370. var pausedFlag = deserialize( state.paused ),
  3371. overviewFlag = deserialize( state.overview );
  3372. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3373. togglePause( pausedFlag );
  3374. }
  3375. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3376. toggleOverview( overviewFlag );
  3377. }
  3378. }
  3379. }
  3380. /**
  3381. * Return a sorted fragments list, ordered by an increasing
  3382. * "data-fragment-index" attribute.
  3383. *
  3384. * Fragments will be revealed in the order that they are returned by
  3385. * this function, so you can use the index attributes to control the
  3386. * order of fragment appearance.
  3387. *
  3388. * To maintain a sensible default fragment order, fragments are presumed
  3389. * to be passed in document order. This function adds a "fragment-index"
  3390. * attribute to each node if such an attribute is not already present,
  3391. * and sets that attribute to an integer value which is the position of
  3392. * the fragment within the fragments list.
  3393. *
  3394. * @param {object[]|*} fragments
  3395. * @param {boolean} grouped If true the returned array will contain
  3396. * nested arrays for all fragments with the same index
  3397. * @return {object[]} sorted Sorted array of fragments
  3398. */
  3399. function sortFragments( fragments, grouped ) {
  3400. fragments = toArray( fragments );
  3401. var ordered = [],
  3402. unordered = [],
  3403. sorted = [];
  3404. // Group ordered and unordered elements
  3405. fragments.forEach( function( fragment, i ) {
  3406. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3407. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3408. if( !ordered[index] ) {
  3409. ordered[index] = [];
  3410. }
  3411. ordered[index].push( fragment );
  3412. }
  3413. else {
  3414. unordered.push( [ fragment ] );
  3415. }
  3416. } );
  3417. // Append fragments without explicit indices in their
  3418. // DOM order
  3419. ordered = ordered.concat( unordered );
  3420. // Manually count the index up per group to ensure there
  3421. // are no gaps
  3422. var index = 0;
  3423. // Push all fragments in their sorted order to an array,
  3424. // this flattens the groups
  3425. ordered.forEach( function( group ) {
  3426. group.forEach( function( fragment ) {
  3427. sorted.push( fragment );
  3428. fragment.setAttribute( 'data-fragment-index', index );
  3429. } );
  3430. index ++;
  3431. } );
  3432. return grouped === true ? ordered : sorted;
  3433. }
  3434. /**
  3435. * Refreshes the fragments on the current slide so that they
  3436. * have the appropriate classes (.visible + .current-fragment).
  3437. *
  3438. * @param {number} [index] The index of the current fragment
  3439. * @param {array} [fragments] Array containing all fragments
  3440. * in the current slide
  3441. *
  3442. * @return {{shown: array, hidden: array}}
  3443. */
  3444. function updateFragments( index, fragments ) {
  3445. var changedFragments = {
  3446. shown: [],
  3447. hidden: []
  3448. };
  3449. if( currentSlide && config.fragments ) {
  3450. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3451. if( fragments.length ) {
  3452. if( typeof index !== 'number' ) {
  3453. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3454. if( currentFragment ) {
  3455. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3456. }
  3457. }
  3458. toArray( fragments ).forEach( function( el, i ) {
  3459. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3460. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3461. }
  3462. // Visible fragments
  3463. if( i <= index ) {
  3464. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3465. el.classList.add( 'visible' );
  3466. el.classList.remove( 'current-fragment' );
  3467. // Announce the fragments one by one to the Screen Reader
  3468. dom.statusDiv.textContent = getStatusText( el );
  3469. if( i === index ) {
  3470. el.classList.add( 'current-fragment' );
  3471. startEmbeddedContent( el );
  3472. }
  3473. }
  3474. // Hidden fragments
  3475. else {
  3476. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3477. el.classList.remove( 'visible' );
  3478. el.classList.remove( 'current-fragment' );
  3479. }
  3480. } );
  3481. }
  3482. }
  3483. return changedFragments;
  3484. }
  3485. /**
  3486. * Navigate to the specified slide fragment.
  3487. *
  3488. * @param {?number} index The index of the fragment that
  3489. * should be shown, -1 means all are invisible
  3490. * @param {number} offset Integer offset to apply to the
  3491. * fragment index
  3492. *
  3493. * @return {boolean} true if a change was made in any
  3494. * fragments visibility as part of this call
  3495. */
  3496. function navigateFragment( index, offset ) {
  3497. if( currentSlide && config.fragments ) {
  3498. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3499. if( fragments.length ) {
  3500. // If no index is specified, find the current
  3501. if( typeof index !== 'number' ) {
  3502. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3503. if( lastVisibleFragment ) {
  3504. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3505. }
  3506. else {
  3507. index = -1;
  3508. }
  3509. }
  3510. // If an offset is specified, apply it to the index
  3511. if( typeof offset === 'number' ) {
  3512. index += offset;
  3513. }
  3514. var changedFragments = updateFragments( index, fragments );
  3515. if( changedFragments.hidden.length ) {
  3516. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3517. }
  3518. if( changedFragments.shown.length ) {
  3519. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3520. }
  3521. updateControls();
  3522. updateProgress();
  3523. if( config.fragmentInURL ) {
  3524. writeURL();
  3525. }
  3526. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3527. }
  3528. }
  3529. return false;
  3530. }
  3531. /**
  3532. * Navigate to the next slide fragment.
  3533. *
  3534. * @return {boolean} true if there was a next fragment,
  3535. * false otherwise
  3536. */
  3537. function nextFragment() {
  3538. return navigateFragment( null, 1 );
  3539. }
  3540. /**
  3541. * Navigate to the previous slide fragment.
  3542. *
  3543. * @return {boolean} true if there was a previous fragment,
  3544. * false otherwise
  3545. */
  3546. function previousFragment() {
  3547. return navigateFragment( null, -1 );
  3548. }
  3549. /**
  3550. * Cues a new automated slide if enabled in the config.
  3551. */
  3552. function cueAutoSlide() {
  3553. cancelAutoSlide();
  3554. if( currentSlide && config.autoSlide !== false ) {
  3555. var fragment = currentSlide.querySelector( '.current-fragment' );
  3556. // When the slide first appears there is no "current" fragment so
  3557. // we look for a data-autoslide timing on the first fragment
  3558. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3559. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3560. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3561. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3562. // Pick value in the following priority order:
  3563. // 1. Current fragment's data-autoslide
  3564. // 2. Current slide's data-autoslide
  3565. // 3. Parent slide's data-autoslide
  3566. // 4. Global autoSlide setting
  3567. if( fragmentAutoSlide ) {
  3568. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3569. }
  3570. else if( slideAutoSlide ) {
  3571. autoSlide = parseInt( slideAutoSlide, 10 );
  3572. }
  3573. else if( parentAutoSlide ) {
  3574. autoSlide = parseInt( parentAutoSlide, 10 );
  3575. }
  3576. else {
  3577. autoSlide = config.autoSlide;
  3578. }
  3579. // If there are media elements with data-autoplay,
  3580. // automatically set the autoSlide duration to the
  3581. // length of that media. Not applicable if the slide
  3582. // is divided up into fragments.
  3583. // playbackRate is accounted for in the duration.
  3584. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3585. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3586. if( el.hasAttribute( 'data-autoplay' ) ) {
  3587. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3588. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3589. }
  3590. }
  3591. } );
  3592. }
  3593. // Cue the next auto-slide if:
  3594. // - There is an autoSlide value
  3595. // - Auto-sliding isn't paused by the user
  3596. // - The presentation isn't paused
  3597. // - The overview isn't active
  3598. // - The presentation isn't over
  3599. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3600. autoSlideTimeout = setTimeout( function() {
  3601. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3602. cueAutoSlide();
  3603. }, autoSlide );
  3604. autoSlideStartTime = Date.now();
  3605. }
  3606. if( autoSlidePlayer ) {
  3607. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3608. }
  3609. }
  3610. }
  3611. /**
  3612. * Cancels any ongoing request to auto-slide.
  3613. */
  3614. function cancelAutoSlide() {
  3615. clearTimeout( autoSlideTimeout );
  3616. autoSlideTimeout = -1;
  3617. }
  3618. function pauseAutoSlide() {
  3619. if( autoSlide && !autoSlidePaused ) {
  3620. autoSlidePaused = true;
  3621. dispatchEvent( 'autoslidepaused' );
  3622. clearTimeout( autoSlideTimeout );
  3623. if( autoSlidePlayer ) {
  3624. autoSlidePlayer.setPlaying( false );
  3625. }
  3626. }
  3627. }
  3628. function resumeAutoSlide() {
  3629. if( autoSlide && autoSlidePaused ) {
  3630. autoSlidePaused = false;
  3631. dispatchEvent( 'autoslideresumed' );
  3632. cueAutoSlide();
  3633. }
  3634. }
  3635. function navigateLeft() {
  3636. // Reverse for RTL
  3637. if( config.rtl ) {
  3638. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3639. slide( indexh + 1 );
  3640. }
  3641. }
  3642. // Normal navigation
  3643. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3644. slide( indexh - 1 );
  3645. }
  3646. }
  3647. function navigateRight() {
  3648. hasNavigatedRight = true;
  3649. // Reverse for RTL
  3650. if( config.rtl ) {
  3651. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3652. slide( indexh - 1 );
  3653. }
  3654. }
  3655. // Normal navigation
  3656. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3657. slide( indexh + 1 );
  3658. }
  3659. }
  3660. function navigateUp() {
  3661. // Prioritize hiding fragments
  3662. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3663. slide( indexh, indexv - 1 );
  3664. }
  3665. }
  3666. function navigateDown() {
  3667. hasNavigatedDown = true;
  3668. // Prioritize revealing fragments
  3669. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3670. slide( indexh, indexv + 1 );
  3671. }
  3672. }
  3673. /**
  3674. * Navigates backwards, prioritized in the following order:
  3675. * 1) Previous fragment
  3676. * 2) Previous vertical slide
  3677. * 3) Previous horizontal slide
  3678. */
  3679. function navigatePrev() {
  3680. // Prioritize revealing fragments
  3681. if( previousFragment() === false ) {
  3682. if( availableRoutes().up ) {
  3683. navigateUp();
  3684. }
  3685. else {
  3686. // Fetch the previous horizontal slide, if there is one
  3687. var previousSlide;
  3688. if( config.rtl ) {
  3689. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3690. }
  3691. else {
  3692. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3693. }
  3694. if( previousSlide ) {
  3695. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3696. var h = indexh - 1;
  3697. slide( h, v );
  3698. }
  3699. }
  3700. }
  3701. }
  3702. /**
  3703. * The reverse of #navigatePrev().
  3704. */
  3705. function navigateNext() {
  3706. hasNavigatedRight = true;
  3707. hasNavigatedDown = true;
  3708. // Prioritize revealing fragments
  3709. if( nextFragment() === false ) {
  3710. var routes = availableRoutes();
  3711. // When looping is enabled `routes.down` is always available
  3712. // so we need a separate check for when we've reached the
  3713. // end of a stack and should move horizontally
  3714. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3715. routes.down = false;
  3716. }
  3717. if( routes.down ) {
  3718. navigateDown();
  3719. }
  3720. else if( config.rtl ) {
  3721. navigateLeft();
  3722. }
  3723. else {
  3724. navigateRight();
  3725. }
  3726. }
  3727. }
  3728. /**
  3729. * Checks if the target element prevents the triggering of
  3730. * swipe navigation.
  3731. */
  3732. function isSwipePrevented( target ) {
  3733. while( target && typeof target.hasAttribute === 'function' ) {
  3734. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3735. target = target.parentNode;
  3736. }
  3737. return false;
  3738. }
  3739. // --------------------------------------------------------------------//
  3740. // ----------------------------- EVENTS -------------------------------//
  3741. // --------------------------------------------------------------------//
  3742. /**
  3743. * Called by all event handlers that are based on user
  3744. * input.
  3745. *
  3746. * @param {object} [event]
  3747. */
  3748. function onUserInput( event ) {
  3749. if( config.autoSlideStoppable ) {
  3750. pauseAutoSlide();
  3751. }
  3752. }
  3753. /**
  3754. * Called whenever there is mouse input at the document level
  3755. * to determine if the cursor is active or not.
  3756. *
  3757. * @param {object} event
  3758. */
  3759. function onDocumentCursorActive( event ) {
  3760. showCursor();
  3761. clearTimeout( cursorInactiveTimeout );
  3762. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3763. }
  3764. /**
  3765. * Handler for the document level 'keypress' event.
  3766. *
  3767. * @param {object} event
  3768. */
  3769. function onDocumentKeyPress( event ) {
  3770. // Check if the pressed key is question mark
  3771. if( event.shiftKey && event.charCode === 63 ) {
  3772. toggleHelp();
  3773. }
  3774. }
  3775. /**
  3776. * Handler for the document level 'keydown' event.
  3777. *
  3778. * @param {object} event
  3779. */
  3780. function onDocumentKeyDown( event ) {
  3781. // If there's a condition specified and it returns false,
  3782. // ignore this event
  3783. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3784. return true;
  3785. }
  3786. // Remember if auto-sliding was paused so we can toggle it
  3787. var autoSlideWasPaused = autoSlidePaused;
  3788. onUserInput( event );
  3789. // Is there a focused element that could be using the keyboard?
  3790. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3791. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3792. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3793. // Whitelist specific modified + keycode combinations
  3794. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3795. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && event.keyCode === 37;
  3796. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && event.keyCode === 39;
  3797. // Prevent all other events when a modifier is pressed
  3798. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3799. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  3800. // Disregard the event if there's a focused element or a
  3801. // keyboard modifier key is present
  3802. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  3803. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3804. var resumeKeyCodes = [66,86,190,191];
  3805. var key;
  3806. // Custom key bindings for togglePause should be able to resume
  3807. if( typeof config.keyboard === 'object' ) {
  3808. for( key in config.keyboard ) {
  3809. if( config.keyboard[key] === 'togglePause' ) {
  3810. resumeKeyCodes.push( parseInt( key, 10 ) );
  3811. }
  3812. }
  3813. }
  3814. if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
  3815. return false;
  3816. }
  3817. var triggered = false;
  3818. // 1. User defined key bindings
  3819. if( typeof config.keyboard === 'object' ) {
  3820. for( key in config.keyboard ) {
  3821. // Check if this binding matches the pressed key
  3822. if( parseInt( key, 10 ) === event.keyCode ) {
  3823. var value = config.keyboard[ key ];
  3824. // Callback function
  3825. if( typeof value === 'function' ) {
  3826. value.apply( null, [ event ] );
  3827. }
  3828. // String shortcuts to reveal.js API
  3829. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3830. Reveal[ value ].call();
  3831. }
  3832. triggered = true;
  3833. }
  3834. }
  3835. }
  3836. // 2. Registered custom key bindings
  3837. if( triggered === false ) {
  3838. for( key in registeredKeyBindings ) {
  3839. // Check if this binding matches the pressed key
  3840. if( parseInt( key, 10 ) === event.keyCode ) {
  3841. var action = registeredKeyBindings[ key ].callback;
  3842. // Callback function
  3843. if( typeof action === 'function' ) {
  3844. action.apply( null, [ event ] );
  3845. }
  3846. // String shortcuts to reveal.js API
  3847. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  3848. Reveal[ action ].call();
  3849. }
  3850. triggered = true;
  3851. }
  3852. }
  3853. }
  3854. // 3. System defined key bindings
  3855. if( triggered === false ) {
  3856. // Assume true and try to prove false
  3857. triggered = true;
  3858. switch( event.keyCode ) {
  3859. // p, page up
  3860. case 80: case 33: navigatePrev(); break;
  3861. // n, page down
  3862. case 78: case 34: navigateNext(); break;
  3863. // h, left
  3864. case 72: case 37: firstSlideShortcut ? slide( 0 ) : navigateLeft(); break;
  3865. // l, right
  3866. case 76: case 39: lastSlideShortcut ? slide( Number.MAX_VALUE ) : navigateRight(); break;
  3867. // k, up
  3868. case 75: case 38: navigateUp(); break;
  3869. // j, down
  3870. case 74: case 40: navigateDown(); break;
  3871. // home
  3872. case 36: slide( 0 ); break;
  3873. // end
  3874. case 35: slide( Number.MAX_VALUE ); break;
  3875. // space
  3876. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  3877. // return
  3878. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  3879. // two-spot, semicolon, b, v, period, Logitech presenter tools "black screen" button
  3880. case 58: case 59: case 66: case 86: case 190: case 191: togglePause(); break;
  3881. // f
  3882. case 70: enterFullscreen(); break;
  3883. // a
  3884. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  3885. default:
  3886. triggered = false;
  3887. }
  3888. }
  3889. // If the input resulted in a triggered action we should prevent
  3890. // the browsers default behavior
  3891. if( triggered ) {
  3892. event.preventDefault && event.preventDefault();
  3893. }
  3894. // ESC or O key
  3895. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  3896. if( dom.overlay ) {
  3897. closeOverlay();
  3898. }
  3899. else {
  3900. toggleOverview();
  3901. }
  3902. event.preventDefault && event.preventDefault();
  3903. }
  3904. // If auto-sliding is enabled we need to cue up
  3905. // another timeout
  3906. cueAutoSlide();
  3907. }
  3908. /**
  3909. * Handler for the 'touchstart' event, enables support for
  3910. * swipe and pinch gestures.
  3911. *
  3912. * @param {object} event
  3913. */
  3914. function onTouchStart( event ) {
  3915. if( isSwipePrevented( event.target ) ) return true;
  3916. touch.startX = event.touches[0].clientX;
  3917. touch.startY = event.touches[0].clientY;
  3918. touch.startCount = event.touches.length;
  3919. // If there's two touches we need to memorize the distance
  3920. // between those two points to detect pinching
  3921. if( event.touches.length === 2 && config.overview ) {
  3922. touch.startSpan = distanceBetween( {
  3923. x: event.touches[1].clientX,
  3924. y: event.touches[1].clientY
  3925. }, {
  3926. x: touch.startX,
  3927. y: touch.startY
  3928. } );
  3929. }
  3930. }
  3931. /**
  3932. * Handler for the 'touchmove' event.
  3933. *
  3934. * @param {object} event
  3935. */
  3936. function onTouchMove( event ) {
  3937. if( isSwipePrevented( event.target ) ) return true;
  3938. // Each touch should only trigger one action
  3939. if( !touch.captured ) {
  3940. onUserInput( event );
  3941. var currentX = event.touches[0].clientX;
  3942. var currentY = event.touches[0].clientY;
  3943. // If the touch started with two points and still has
  3944. // two active touches; test for the pinch gesture
  3945. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  3946. // The current distance in pixels between the two touch points
  3947. var currentSpan = distanceBetween( {
  3948. x: event.touches[1].clientX,
  3949. y: event.touches[1].clientY
  3950. }, {
  3951. x: touch.startX,
  3952. y: touch.startY
  3953. } );
  3954. // If the span is larger than the desire amount we've got
  3955. // ourselves a pinch
  3956. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  3957. touch.captured = true;
  3958. if( currentSpan < touch.startSpan ) {
  3959. activateOverview();
  3960. }
  3961. else {
  3962. deactivateOverview();
  3963. }
  3964. }
  3965. event.preventDefault();
  3966. }
  3967. // There was only one touch point, look for a swipe
  3968. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  3969. var deltaX = currentX - touch.startX,
  3970. deltaY = currentY - touch.startY;
  3971. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3972. touch.captured = true;
  3973. navigateLeft();
  3974. }
  3975. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3976. touch.captured = true;
  3977. navigateRight();
  3978. }
  3979. else if( deltaY > touch.threshold ) {
  3980. touch.captured = true;
  3981. navigateUp();
  3982. }
  3983. else if( deltaY < -touch.threshold ) {
  3984. touch.captured = true;
  3985. navigateDown();
  3986. }
  3987. // If we're embedded, only block touch events if they have
  3988. // triggered an action
  3989. if( config.embedded ) {
  3990. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  3991. event.preventDefault();
  3992. }
  3993. }
  3994. // Not embedded? Block them all to avoid needless tossing
  3995. // around of the viewport in iOS
  3996. else {
  3997. event.preventDefault();
  3998. }
  3999. }
  4000. }
  4001. // There's a bug with swiping on some Android devices unless
  4002. // the default action is always prevented
  4003. else if( UA.match( /android/gi ) ) {
  4004. event.preventDefault();
  4005. }
  4006. }
  4007. /**
  4008. * Handler for the 'touchend' event.
  4009. *
  4010. * @param {object} event
  4011. */
  4012. function onTouchEnd( event ) {
  4013. touch.captured = false;
  4014. }
  4015. /**
  4016. * Convert pointer down to touch start.
  4017. *
  4018. * @param {object} event
  4019. */
  4020. function onPointerDown( event ) {
  4021. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4022. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4023. onTouchStart( event );
  4024. }
  4025. }
  4026. /**
  4027. * Convert pointer move to touch move.
  4028. *
  4029. * @param {object} event
  4030. */
  4031. function onPointerMove( event ) {
  4032. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4033. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4034. onTouchMove( event );
  4035. }
  4036. }
  4037. /**
  4038. * Convert pointer up to touch end.
  4039. *
  4040. * @param {object} event
  4041. */
  4042. function onPointerUp( event ) {
  4043. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4044. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4045. onTouchEnd( event );
  4046. }
  4047. }
  4048. /**
  4049. * Handles mouse wheel scrolling, throttled to avoid skipping
  4050. * multiple slides.
  4051. *
  4052. * @param {object} event
  4053. */
  4054. function onDocumentMouseScroll( event ) {
  4055. if( Date.now() - lastMouseWheelStep > 600 ) {
  4056. lastMouseWheelStep = Date.now();
  4057. var delta = event.detail || -event.wheelDelta;
  4058. if( delta > 0 ) {
  4059. navigateNext();
  4060. }
  4061. else if( delta < 0 ) {
  4062. navigatePrev();
  4063. }
  4064. }
  4065. }
  4066. /**
  4067. * Clicking on the progress bar results in a navigation to the
  4068. * closest approximate horizontal slide using this equation:
  4069. *
  4070. * ( clickX / presentationWidth ) * numberOfSlides
  4071. *
  4072. * @param {object} event
  4073. */
  4074. function onProgressClicked( event ) {
  4075. onUserInput( event );
  4076. event.preventDefault();
  4077. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4078. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4079. if( config.rtl ) {
  4080. slideIndex = slidesTotal - slideIndex;
  4081. }
  4082. slide( slideIndex );
  4083. }
  4084. /**
  4085. * Event handler for navigation control buttons.
  4086. */
  4087. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  4088. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  4089. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4090. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4091. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4092. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4093. /**
  4094. * Handler for the window level 'hashchange' event.
  4095. *
  4096. * @param {object} [event]
  4097. */
  4098. function onWindowHashChange( event ) {
  4099. readURL();
  4100. }
  4101. /**
  4102. * Handler for the window level 'resize' event.
  4103. *
  4104. * @param {object} [event]
  4105. */
  4106. function onWindowResize( event ) {
  4107. layout();
  4108. }
  4109. /**
  4110. * Handle for the window level 'visibilitychange' event.
  4111. *
  4112. * @param {object} [event]
  4113. */
  4114. function onPageVisibilityChange( event ) {
  4115. var isHidden = document.webkitHidden ||
  4116. document.msHidden ||
  4117. document.hidden;
  4118. // If, after clicking a link or similar and we're coming back,
  4119. // focus the document.body to ensure we can use keyboard shortcuts
  4120. if( isHidden === false && document.activeElement !== document.body ) {
  4121. // Not all elements support .blur() - SVGs among them.
  4122. if( typeof document.activeElement.blur === 'function' ) {
  4123. document.activeElement.blur();
  4124. }
  4125. document.body.focus();
  4126. }
  4127. }
  4128. /**
  4129. * Invoked when a slide is and we're in the overview.
  4130. *
  4131. * @param {object} event
  4132. */
  4133. function onOverviewSlideClicked( event ) {
  4134. // TODO There's a bug here where the event listeners are not
  4135. // removed after deactivating the overview.
  4136. if( eventsAreBound && isOverview() ) {
  4137. event.preventDefault();
  4138. var element = event.target;
  4139. while( element && !element.nodeName.match( /section/gi ) ) {
  4140. element = element.parentNode;
  4141. }
  4142. if( element && !element.classList.contains( 'disabled' ) ) {
  4143. deactivateOverview();
  4144. if( element.nodeName.match( /section/gi ) ) {
  4145. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4146. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4147. slide( h, v );
  4148. }
  4149. }
  4150. }
  4151. }
  4152. /**
  4153. * Handles clicks on links that are set to preview in the
  4154. * iframe overlay.
  4155. *
  4156. * @param {object} event
  4157. */
  4158. function onPreviewLinkClicked( event ) {
  4159. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4160. var url = event.currentTarget.getAttribute( 'href' );
  4161. if( url ) {
  4162. showPreview( url );
  4163. event.preventDefault();
  4164. }
  4165. }
  4166. }
  4167. /**
  4168. * Handles click on the auto-sliding controls element.
  4169. *
  4170. * @param {object} [event]
  4171. */
  4172. function onAutoSlidePlayerClick( event ) {
  4173. // Replay
  4174. if( Reveal.isLastSlide() && config.loop === false ) {
  4175. slide( 0, 0 );
  4176. resumeAutoSlide();
  4177. }
  4178. // Resume
  4179. else if( autoSlidePaused ) {
  4180. resumeAutoSlide();
  4181. }
  4182. // Pause
  4183. else {
  4184. pauseAutoSlide();
  4185. }
  4186. }
  4187. // --------------------------------------------------------------------//
  4188. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4189. // --------------------------------------------------------------------//
  4190. /**
  4191. * Constructor for the playback component, which displays
  4192. * play/pause/progress controls.
  4193. *
  4194. * @param {HTMLElement} container The component will append
  4195. * itself to this
  4196. * @param {function} progressCheck A method which will be
  4197. * called frequently to get the current progress on a range
  4198. * of 0-1
  4199. */
  4200. function Playback( container, progressCheck ) {
  4201. // Cosmetics
  4202. this.diameter = 100;
  4203. this.diameter2 = this.diameter/2;
  4204. this.thickness = 6;
  4205. // Flags if we are currently playing
  4206. this.playing = false;
  4207. // Current progress on a 0-1 range
  4208. this.progress = 0;
  4209. // Used to loop the animation smoothly
  4210. this.progressOffset = 1;
  4211. this.container = container;
  4212. this.progressCheck = progressCheck;
  4213. this.canvas = document.createElement( 'canvas' );
  4214. this.canvas.className = 'playback';
  4215. this.canvas.width = this.diameter;
  4216. this.canvas.height = this.diameter;
  4217. this.canvas.style.width = this.diameter2 + 'px';
  4218. this.canvas.style.height = this.diameter2 + 'px';
  4219. this.context = this.canvas.getContext( '2d' );
  4220. this.container.appendChild( this.canvas );
  4221. this.render();
  4222. }
  4223. /**
  4224. * @param value
  4225. */
  4226. Playback.prototype.setPlaying = function( value ) {
  4227. var wasPlaying = this.playing;
  4228. this.playing = value;
  4229. // Start repainting if we weren't already
  4230. if( !wasPlaying && this.playing ) {
  4231. this.animate();
  4232. }
  4233. else {
  4234. this.render();
  4235. }
  4236. };
  4237. Playback.prototype.animate = function() {
  4238. var progressBefore = this.progress;
  4239. this.progress = this.progressCheck();
  4240. // When we loop, offset the progress so that it eases
  4241. // smoothly rather than immediately resetting
  4242. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4243. this.progressOffset = this.progress;
  4244. }
  4245. this.render();
  4246. if( this.playing ) {
  4247. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4248. }
  4249. };
  4250. /**
  4251. * Renders the current progress and playback state.
  4252. */
  4253. Playback.prototype.render = function() {
  4254. var progress = this.playing ? this.progress : 0,
  4255. radius = ( this.diameter2 ) - this.thickness,
  4256. x = this.diameter2,
  4257. y = this.diameter2,
  4258. iconSize = 28;
  4259. // Ease towards 1
  4260. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4261. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4262. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4263. this.context.save();
  4264. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4265. // Solid background color
  4266. this.context.beginPath();
  4267. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4268. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4269. this.context.fill();
  4270. // Draw progress track
  4271. this.context.beginPath();
  4272. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4273. this.context.lineWidth = this.thickness;
  4274. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4275. this.context.stroke();
  4276. if( this.playing ) {
  4277. // Draw progress on top of track
  4278. this.context.beginPath();
  4279. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4280. this.context.lineWidth = this.thickness;
  4281. this.context.strokeStyle = '#fff';
  4282. this.context.stroke();
  4283. }
  4284. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4285. // Draw play/pause icons
  4286. if( this.playing ) {
  4287. this.context.fillStyle = '#fff';
  4288. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4289. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4290. }
  4291. else {
  4292. this.context.beginPath();
  4293. this.context.translate( 4, 0 );
  4294. this.context.moveTo( 0, 0 );
  4295. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4296. this.context.lineTo( 0, iconSize );
  4297. this.context.fillStyle = '#fff';
  4298. this.context.fill();
  4299. }
  4300. this.context.restore();
  4301. };
  4302. Playback.prototype.on = function( type, listener ) {
  4303. this.canvas.addEventListener( type, listener, false );
  4304. };
  4305. Playback.prototype.off = function( type, listener ) {
  4306. this.canvas.removeEventListener( type, listener, false );
  4307. };
  4308. Playback.prototype.destroy = function() {
  4309. this.playing = false;
  4310. if( this.canvas.parentNode ) {
  4311. this.container.removeChild( this.canvas );
  4312. }
  4313. };
  4314. // --------------------------------------------------------------------//
  4315. // ------------------------------- API --------------------------------//
  4316. // --------------------------------------------------------------------//
  4317. Reveal = {
  4318. VERSION: VERSION,
  4319. initialize: initialize,
  4320. configure: configure,
  4321. sync: sync,
  4322. syncSlide: syncSlide,
  4323. syncFragments: syncFragments,
  4324. // Navigation methods
  4325. slide: slide,
  4326. left: navigateLeft,
  4327. right: navigateRight,
  4328. up: navigateUp,
  4329. down: navigateDown,
  4330. prev: navigatePrev,
  4331. next: navigateNext,
  4332. // Fragment methods
  4333. navigateFragment: navigateFragment,
  4334. prevFragment: previousFragment,
  4335. nextFragment: nextFragment,
  4336. // Deprecated aliases
  4337. navigateTo: slide,
  4338. navigateLeft: navigateLeft,
  4339. navigateRight: navigateRight,
  4340. navigateUp: navigateUp,
  4341. navigateDown: navigateDown,
  4342. navigatePrev: navigatePrev,
  4343. navigateNext: navigateNext,
  4344. // Forces an update in slide layout
  4345. layout: layout,
  4346. // Randomizes the order of slides
  4347. shuffle: shuffle,
  4348. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4349. availableRoutes: availableRoutes,
  4350. // Returns an object with the available fragments as booleans (prev/next)
  4351. availableFragments: availableFragments,
  4352. // Toggles a help overlay with keyboard shortcuts
  4353. toggleHelp: toggleHelp,
  4354. // Toggles the overview mode on/off
  4355. toggleOverview: toggleOverview,
  4356. // Toggles the "black screen" mode on/off
  4357. togglePause: togglePause,
  4358. // Toggles the auto slide mode on/off
  4359. toggleAutoSlide: toggleAutoSlide,
  4360. // State checks
  4361. isOverview: isOverview,
  4362. isPaused: isPaused,
  4363. isAutoSliding: isAutoSliding,
  4364. isSpeakerNotes: isSpeakerNotes,
  4365. // Slide preloading
  4366. loadSlide: loadSlide,
  4367. unloadSlide: unloadSlide,
  4368. // Adds or removes all internal event listeners (such as keyboard)
  4369. addEventListeners: addEventListeners,
  4370. removeEventListeners: removeEventListeners,
  4371. // Facility for persisting and restoring the presentation state
  4372. getState: getState,
  4373. setState: setState,
  4374. // Presentation progress
  4375. getSlidePastCount: getSlidePastCount,
  4376. // Presentation progress on range of 0-1
  4377. getProgress: getProgress,
  4378. // Returns the indices of the current, or specified, slide
  4379. getIndices: getIndices,
  4380. // Returns an Array of all slides
  4381. getSlides: getSlides,
  4382. // Returns an Array of objects representing the attributes on
  4383. // the slides
  4384. getSlidesAttributes: getSlidesAttributes,
  4385. // Returns the total number of slides
  4386. getTotalSlides: getTotalSlides,
  4387. // Returns the slide element at the specified index
  4388. getSlide: getSlide,
  4389. // Returns the slide background element at the specified index
  4390. getSlideBackground: getSlideBackground,
  4391. // Returns the speaker notes string for a slide, or null
  4392. getSlideNotes: getSlideNotes,
  4393. // Returns the previous slide element, may be null
  4394. getPreviousSlide: function() {
  4395. return previousSlide;
  4396. },
  4397. // Returns the current slide element
  4398. getCurrentSlide: function() {
  4399. return currentSlide;
  4400. },
  4401. // Returns the current scale of the presentation content
  4402. getScale: function() {
  4403. return scale;
  4404. },
  4405. // Returns the current configuration object
  4406. getConfig: function() {
  4407. return config;
  4408. },
  4409. // Helper method, retrieves query string as a key/value hash
  4410. getQueryHash: function() {
  4411. var query = {};
  4412. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4413. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4414. } );
  4415. // Basic deserialization
  4416. for( var i in query ) {
  4417. var value = query[ i ];
  4418. query[ i ] = deserialize( unescape( value ) );
  4419. }
  4420. return query;
  4421. },
  4422. // Returns the top-level DOM element
  4423. getRevealElement: function() {
  4424. return dom.wrapper || document.querySelector( '.reveal' );
  4425. },
  4426. // Returns true if we're currently on the first slide
  4427. isFirstSlide: function() {
  4428. return ( indexh === 0 && indexv === 0 );
  4429. },
  4430. // Returns true if we're currently on the last slide
  4431. isLastSlide: function() {
  4432. if( currentSlide ) {
  4433. // Does this slide have a next sibling?
  4434. if( currentSlide.nextElementSibling ) return false;
  4435. // If it's vertical, does its parent have a next sibling?
  4436. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4437. return true;
  4438. }
  4439. return false;
  4440. },
  4441. // Returns true if we're on the last slide in the current
  4442. // vertical stack
  4443. isLastVerticalSlide: function() {
  4444. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4445. // Does this slide have a next sibling?
  4446. if( currentSlide.nextElementSibling ) return false;
  4447. return true;
  4448. }
  4449. return false;
  4450. },
  4451. // Checks if reveal.js has been loaded and is ready for use
  4452. isReady: function() {
  4453. return loaded;
  4454. },
  4455. // Forward event binding to the reveal DOM element
  4456. addEventListener: function( type, listener, useCapture ) {
  4457. if( 'addEventListener' in window ) {
  4458. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4459. }
  4460. },
  4461. removeEventListener: function( type, listener, useCapture ) {
  4462. if( 'addEventListener' in window ) {
  4463. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4464. }
  4465. },
  4466. // Adds a custom key binding
  4467. addKeyBinding: addKeyBinding,
  4468. // Removes a custom key binding
  4469. removeKeyBinding: removeKeyBinding,
  4470. // Programatically triggers a keyboard event
  4471. triggerKey: function( keyCode ) {
  4472. onDocumentKeyDown( { keyCode: keyCode } );
  4473. },
  4474. // Registers a new shortcut to include in the help overlay
  4475. registerKeyboardShortcut: function( key, value ) {
  4476. keyboardShortcuts[key] = value;
  4477. }
  4478. };
  4479. return Reveal;
  4480. }));