reveal.js 164 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420142114221423142414251426142714281429143014311432143314341435143614371438143914401441144214431444144514461447144814491450145114521453145414551456145714581459146014611462146314641465146614671468146914701471147214731474147514761477147814791480148114821483148414851486148714881489149014911492149314941495149614971498149915001501150215031504150515061507150815091510151115121513151415151516151715181519152015211522152315241525152615271528152915301531153215331534153515361537153815391540154115421543154415451546154715481549155015511552155315541555155615571558155915601561156215631564156515661567156815691570157115721573157415751576157715781579158015811582158315841585158615871588158915901591159215931594159515961597159815991600160116021603160416051606160716081609161016111612161316141615161616171618161916201621162216231624162516261627162816291630163116321633163416351636163716381639164016411642164316441645164616471648164916501651165216531654165516561657165816591660166116621663166416651666166716681669167016711672167316741675167616771678167916801681168216831684168516861687168816891690169116921693169416951696169716981699170017011702170317041705170617071708170917101711171217131714171517161717171817191720172117221723172417251726172717281729173017311732173317341735173617371738173917401741174217431744174517461747174817491750175117521753175417551756175717581759176017611762176317641765176617671768176917701771177217731774177517761777177817791780178117821783178417851786178717881789179017911792179317941795179617971798179918001801180218031804180518061807180818091810181118121813181418151816181718181819182018211822182318241825182618271828182918301831183218331834183518361837183818391840184118421843184418451846184718481849185018511852185318541855185618571858185918601861186218631864186518661867186818691870187118721873187418751876187718781879188018811882188318841885188618871888188918901891189218931894189518961897189818991900190119021903190419051906190719081909191019111912191319141915191619171918191919201921192219231924192519261927192819291930193119321933193419351936193719381939194019411942194319441945194619471948194919501951195219531954195519561957195819591960196119621963196419651966196719681969197019711972197319741975197619771978197919801981198219831984198519861987198819891990199119921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420252026202720282029203020312032203320342035203620372038203920402041204220432044204520462047204820492050205120522053205420552056205720582059206020612062206320642065206620672068206920702071207220732074207520762077207820792080208120822083208420852086208720882089209020912092209320942095209620972098209921002101210221032104210521062107210821092110211121122113211421152116211721182119212021212122212321242125212621272128212921302131213221332134213521362137213821392140214121422143214421452146214721482149215021512152215321542155215621572158215921602161216221632164216521662167216821692170217121722173217421752176217721782179218021812182218321842185218621872188218921902191219221932194219521962197219821992200220122022203220422052206220722082209221022112212221322142215221622172218221922202221222222232224222522262227222822292230223122322233223422352236223722382239224022412242224322442245224622472248224922502251225222532254225522562257225822592260226122622263226422652266226722682269227022712272227322742275227622772278227922802281228222832284228522862287228822892290229122922293229422952296229722982299230023012302230323042305230623072308230923102311231223132314231523162317231823192320232123222323232423252326232723282329233023312332233323342335233623372338233923402341234223432344234523462347234823492350235123522353235423552356235723582359236023612362236323642365236623672368236923702371237223732374237523762377237823792380238123822383238423852386238723882389239023912392239323942395239623972398239924002401240224032404240524062407240824092410241124122413241424152416241724182419242024212422242324242425242624272428242924302431243224332434243524362437243824392440244124422443244424452446244724482449245024512452245324542455245624572458245924602461246224632464246524662467246824692470247124722473247424752476247724782479248024812482248324842485248624872488248924902491249224932494249524962497249824992500250125022503250425052506250725082509251025112512251325142515251625172518251925202521252225232524252525262527252825292530253125322533253425352536253725382539254025412542254325442545254625472548254925502551255225532554255525562557255825592560256125622563256425652566256725682569257025712572257325742575257625772578257925802581258225832584258525862587258825892590259125922593259425952596259725982599260026012602260326042605260626072608260926102611261226132614261526162617261826192620262126222623262426252626262726282629263026312632263326342635263626372638263926402641264226432644264526462647264826492650265126522653265426552656265726582659266026612662266326642665266626672668266926702671267226732674267526762677267826792680268126822683268426852686268726882689269026912692269326942695269626972698269927002701270227032704270527062707270827092710271127122713271427152716271727182719272027212722272327242725272627272728272927302731273227332734273527362737273827392740274127422743274427452746274727482749275027512752275327542755275627572758275927602761276227632764276527662767276827692770277127722773277427752776277727782779278027812782278327842785278627872788278927902791279227932794279527962797279827992800280128022803280428052806280728082809281028112812281328142815281628172818281928202821282228232824282528262827282828292830283128322833283428352836283728382839284028412842284328442845284628472848284928502851285228532854285528562857285828592860286128622863286428652866286728682869287028712872287328742875287628772878287928802881288228832884288528862887288828892890289128922893289428952896289728982899290029012902290329042905290629072908290929102911291229132914291529162917291829192920292129222923292429252926292729282929293029312932293329342935293629372938293929402941294229432944294529462947294829492950295129522953295429552956295729582959296029612962296329642965296629672968296929702971297229732974297529762977297829792980298129822983298429852986298729882989299029912992299329942995299629972998299930003001300230033004300530063007300830093010301130123013301430153016301730183019302030213022302330243025302630273028302930303031303230333034303530363037303830393040304130423043304430453046304730483049305030513052305330543055305630573058305930603061306230633064306530663067306830693070307130723073307430753076307730783079308030813082308330843085308630873088308930903091309230933094309530963097309830993100310131023103310431053106310731083109311031113112311331143115311631173118311931203121312231233124312531263127312831293130313131323133313431353136313731383139314031413142314331443145314631473148314931503151315231533154315531563157315831593160316131623163316431653166316731683169317031713172317331743175317631773178317931803181318231833184318531863187318831893190319131923193319431953196319731983199320032013202320332043205320632073208320932103211321232133214321532163217321832193220322132223223322432253226322732283229323032313232323332343235323632373238323932403241324232433244324532463247324832493250325132523253325432553256325732583259326032613262326332643265326632673268326932703271327232733274327532763277327832793280328132823283328432853286328732883289329032913292329332943295329632973298329933003301330233033304330533063307330833093310331133123313331433153316331733183319332033213322332333243325332633273328332933303331333233333334333533363337333833393340334133423343334433453346334733483349335033513352335333543355335633573358335933603361336233633364336533663367336833693370337133723373337433753376337733783379338033813382338333843385338633873388338933903391339233933394339533963397339833993400340134023403340434053406340734083409341034113412341334143415341634173418341934203421342234233424342534263427342834293430343134323433343434353436343734383439344034413442344334443445344634473448344934503451345234533454345534563457345834593460346134623463346434653466346734683469347034713472347334743475347634773478347934803481348234833484348534863487348834893490349134923493349434953496349734983499350035013502350335043505350635073508350935103511351235133514351535163517351835193520352135223523352435253526352735283529353035313532353335343535353635373538353935403541354235433544354535463547354835493550355135523553355435553556355735583559356035613562356335643565356635673568356935703571357235733574357535763577357835793580358135823583358435853586358735883589359035913592359335943595359635973598359936003601360236033604360536063607360836093610361136123613361436153616361736183619362036213622362336243625362636273628362936303631363236333634363536363637363836393640364136423643364436453646364736483649365036513652365336543655365636573658365936603661366236633664366536663667366836693670367136723673367436753676367736783679368036813682368336843685368636873688368936903691369236933694369536963697369836993700370137023703370437053706370737083709371037113712371337143715371637173718371937203721372237233724372537263727372837293730373137323733373437353736373737383739374037413742374337443745374637473748374937503751375237533754375537563757375837593760376137623763376437653766376737683769377037713772377337743775377637773778377937803781378237833784378537863787378837893790379137923793379437953796379737983799380038013802380338043805380638073808380938103811381238133814381538163817381838193820382138223823382438253826382738283829383038313832383338343835383638373838383938403841384238433844384538463847384838493850385138523853385438553856385738583859386038613862386338643865386638673868386938703871387238733874387538763877387838793880388138823883388438853886388738883889389038913892389338943895389638973898389939003901390239033904390539063907390839093910391139123913391439153916391739183919392039213922392339243925392639273928392939303931393239333934393539363937393839393940394139423943394439453946394739483949395039513952395339543955395639573958395939603961396239633964396539663967396839693970397139723973397439753976397739783979398039813982398339843985398639873988398939903991399239933994399539963997399839994000400140024003400440054006400740084009401040114012401340144015401640174018401940204021402240234024402540264027402840294030403140324033403440354036403740384039404040414042404340444045404640474048404940504051405240534054405540564057405840594060406140624063406440654066406740684069407040714072407340744075407640774078407940804081408240834084408540864087408840894090409140924093409440954096409740984099410041014102410341044105410641074108410941104111411241134114411541164117411841194120412141224123412441254126412741284129413041314132413341344135413641374138413941404141414241434144414541464147414841494150415141524153415441554156415741584159416041614162416341644165416641674168416941704171417241734174417541764177417841794180418141824183418441854186418741884189419041914192419341944195419641974198419942004201420242034204420542064207420842094210421142124213421442154216421742184219422042214222422342244225422642274228422942304231423242334234423542364237423842394240424142424243424442454246424742484249425042514252425342544255425642574258425942604261426242634264426542664267426842694270427142724273427442754276427742784279428042814282428342844285428642874288428942904291429242934294429542964297429842994300430143024303430443054306430743084309431043114312431343144315431643174318431943204321432243234324432543264327432843294330433143324333433443354336433743384339434043414342434343444345434643474348434943504351435243534354435543564357435843594360436143624363436443654366436743684369437043714372437343744375437643774378437943804381438243834384438543864387438843894390439143924393439443954396439743984399440044014402440344044405440644074408440944104411441244134414441544164417441844194420442144224423442444254426442744284429443044314432443344344435443644374438443944404441444244434444444544464447444844494450445144524453445444554456445744584459446044614462446344644465446644674468446944704471447244734474447544764477447844794480448144824483448444854486448744884489449044914492449344944495449644974498449945004501450245034504450545064507450845094510451145124513451445154516451745184519452045214522452345244525452645274528452945304531453245334534453545364537453845394540454145424543454445454546454745484549455045514552455345544555455645574558455945604561456245634564456545664567456845694570457145724573457445754576457745784579458045814582458345844585458645874588458945904591459245934594459545964597459845994600460146024603460446054606460746084609461046114612461346144615461646174618461946204621462246234624462546264627462846294630463146324633463446354636463746384639464046414642464346444645464646474648464946504651465246534654465546564657465846594660466146624663466446654666466746684669467046714672467346744675467646774678467946804681468246834684468546864687468846894690469146924693469446954696469746984699470047014702470347044705470647074708470947104711471247134714471547164717471847194720472147224723472447254726472747284729473047314732473347344735473647374738473947404741474247434744474547464747474847494750475147524753475447554756475747584759476047614762476347644765476647674768476947704771477247734774477547764777477847794780478147824783478447854786478747884789479047914792479347944795479647974798479948004801480248034804480548064807480848094810481148124813481448154816481748184819482048214822482348244825482648274828482948304831483248334834483548364837483848394840484148424843484448454846484748484849485048514852485348544855485648574858485948604861486248634864486548664867486848694870487148724873487448754876487748784879488048814882488348844885488648874888488948904891489248934894489548964897489848994900490149024903490449054906490749084909491049114912491349144915491649174918491949204921492249234924492549264927492849294930493149324933493449354936493749384939494049414942494349444945494649474948494949504951495249534954495549564957495849594960496149624963496449654966496749684969497049714972497349744975497649774978497949804981498249834984498549864987498849894990499149924993499449954996499749984999500050015002500350045005500650075008500950105011501250135014501550165017501850195020502150225023502450255026502750285029503050315032503350345035503650375038503950405041504250435044504550465047504850495050505150525053505450555056505750585059506050615062506350645065506650675068506950705071507250735074507550765077507850795080508150825083508450855086508750885089509050915092509350945095509650975098509951005101510251035104510551065107510851095110511151125113511451155116511751185119512051215122512351245125512651275128512951305131513251335134513551365137513851395140514151425143514451455146514751485149515051515152515351545155515651575158515951605161516251635164516551665167516851695170517151725173517451755176517751785179518051815182518351845185518651875188518951905191519251935194519551965197519851995200520152025203520452055206520752085209521052115212521352145215521652175218521952205221522252235224522552265227522852295230523152325233523452355236523752385239524052415242524352445245524652475248524952505251525252535254525552565257525852595260526152625263526452655266526752685269527052715272527352745275527652775278527952805281528252835284528552865287528852895290529152925293529452955296529752985299530053015302530353045305530653075308530953105311531253135314531553165317531853195320532153225323532453255326532753285329533053315332533353345335533653375338533953405341534253435344534553465347534853495350535153525353535453555356535753585359536053615362536353645365536653675368536953705371537253735374537553765377537853795380538153825383538453855386538753885389539053915392539353945395539653975398539954005401540254035404540554065407540854095410541154125413541454155416541754185419542054215422542354245425542654275428542954305431543254335434543554365437543854395440544154425443544454455446544754485449545054515452545354545455545654575458545954605461546254635464546554665467546854695470547154725473547454755476547754785479548054815482548354845485548654875488548954905491549254935494549554965497549854995500550155025503550455055506550755085509551055115512551355145515551655175518551955205521552255235524552555265527552855295530553155325533553455355536553755385539554055415542554355445545554655475548554955505551555255535554555555565557555855595560556155625563556455655566556755685569557055715572557355745575557655775578557955805581558255835584558555865587558855895590559155925593559455955596559755985599560056015602560356045605560656075608560956105611561256135614561556165617561856195620562156225623562456255626562756285629563056315632563356345635563656375638563956405641564256435644564556465647564856495650565156525653565456555656565756585659566056615662566356645665566656675668566956705671567256735674567556765677567856795680568156825683568456855686568756885689569056915692569356945695569656975698569957005701570257035704570557065707570857095710571157125713571457155716571757185719572057215722572357245725572657275728572957305731573257335734573557365737573857395740574157425743574457455746574757485749575057515752575357545755575657575758575957605761576257635764576557665767576857695770577157725773577457755776577757785779578057815782578357845785578657875788578957905791579257935794579557965797579857995800580158025803580458055806580758085809581058115812581358145815581658175818581958205821582258235824582558265827582858295830583158325833583458355836583758385839584058415842584358445845584658475848584958505851585258535854585558565857585858595860586158625863586458655866586758685869587058715872587358745875587658775878587958805881588258835884588558865887588858895890589158925893589458955896589758985899590059015902590359045905590659075908590959105911591259135914591559165917591859195920592159225923592459255926592759285929593059315932593359345935593659375938593959405941594259435944594559465947594859495950595159525953595459555956595759585959596059615962596359645965596659675968596959705971597259735974597559765977597859795980598159825983598459855986598759885989599059915992599359945995
  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2019 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. // - true: Show slide number
  57. // - false: Hide slide number
  58. //
  59. // Can optionally be set as a string that specifies the number formatting:
  60. // - "h.v": Horizontal . vertical slide number (default)
  61. // - "h/v": Horizontal / vertical slide number
  62. // - "c": Flattened slide number
  63. // - "c/t": Flattened slide number / total slides
  64. //
  65. // Alternatively, you can provide a function that returns the slide
  66. // number for the current slide. The function needs to return an array
  67. // with one string [slideNumber] or three strings [n1,delimiter,n2].
  68. // See #formatSlideNumber().
  69. slideNumber: false,
  70. // Can be used to limit the contexts in which the slide number appears
  71. // - "all": Always show the slide number
  72. // - "print": Only when printing to PDF
  73. // - "speaker": Only in the speaker view
  74. showSlideNumber: 'all',
  75. // Use 1 based indexing for # links to match slide number (default is zero
  76. // based)
  77. hashOneBasedIndex: false,
  78. // Add the current slide number to the URL hash so that reloading the
  79. // page/copying the URL will return you to the same slide
  80. hash: false,
  81. // Push each slide change to the browser history. Implies `hash: true`
  82. history: false,
  83. // Enable keyboard shortcuts for navigation
  84. keyboard: true,
  85. // Optional function that blocks keyboard events when retuning false
  86. keyboardCondition: null,
  87. // Enable the slide overview mode
  88. overview: true,
  89. // Disables the default reveal.js slide layout so that you can use
  90. // custom CSS layout
  91. disableLayout: false,
  92. // Vertical centering of slides
  93. center: true,
  94. // Enables touch navigation on devices with touch input
  95. touch: true,
  96. // Loop the presentation
  97. loop: false,
  98. // Change the presentation direction to be RTL
  99. rtl: false,
  100. // Changes the behavior of our navigation directions.
  101. //
  102. // "default"
  103. // Left/right arrow keys step between horizontal slides, up/down
  104. // arrow keys step between vertical slides. Space key steps through
  105. // all slides (both horizontal and vertical).
  106. //
  107. // "linear"
  108. // Removes the up/down arrows. Left/right arrows step through all
  109. // slides (both horizontal and vertical).
  110. //
  111. // "grid"
  112. // When this is enabled, stepping left/right from a vertical stack
  113. // to an adjacent vertical stack will land you at the same vertical
  114. // index.
  115. //
  116. // Consider a deck with six slides ordered in two vertical stacks:
  117. // 1.1 2.1
  118. // 1.2 2.2
  119. // 1.3 2.3
  120. //
  121. // If you're on slide 1.3 and navigate right, you will normally move
  122. // from 1.3 -> 2.1. With "gridNavigation" enabled the same navigation
  123. // takes you from 1.3 -> 2.3.
  124. navigationMode: 'default',
  125. // Randomizes the order of slides each time the presentation loads
  126. shuffle: false,
  127. // Turns fragments on and off globally
  128. fragments: true,
  129. // Flags whether to include the current fragment in the URL,
  130. // so that reloading brings you to the same fragment position
  131. fragmentInURL: false,
  132. // Flags if the presentation is running in an embedded mode,
  133. // i.e. contained within a limited portion of the screen
  134. embedded: false,
  135. // Flags if we should show a help overlay when the question-mark
  136. // key is pressed
  137. help: true,
  138. // Flags if it should be possible to pause the presentation (blackout)
  139. pause: true,
  140. // Flags if speaker notes should be visible to all viewers
  141. showNotes: false,
  142. // Global override for autolaying embedded media (video/audio/iframe)
  143. // - null: Media will only autoplay if data-autoplay is present
  144. // - true: All media will autoplay, regardless of individual setting
  145. // - false: No media will autoplay, regardless of individual setting
  146. autoPlayMedia: null,
  147. // Global override for preloading lazy-loaded iframes
  148. // - null: Iframes with data-src AND data-preload will be loaded when within
  149. // the viewDistance, iframes with only data-src will be loaded when visible
  150. // - true: All iframes with data-src will be loaded when within the viewDistance
  151. // - false: All iframes with data-src will be loaded only when visible
  152. preloadIframes: null,
  153. // Controls automatic progression to the next slide
  154. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  155. // is present on the current slide or fragment
  156. // - 1+: All slides will progress automatically at the given interval
  157. // - false: No auto-sliding, even if data-autoslide is present
  158. autoSlide: 0,
  159. // Stop auto-sliding after user input
  160. autoSlideStoppable: true,
  161. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  162. autoSlideMethod: null,
  163. // Specify the average time in seconds that you think you will spend
  164. // presenting each slide. This is used to show a pacing timer in the
  165. // speaker view
  166. defaultTiming: null,
  167. // Enable slide navigation via mouse wheel
  168. mouseWheel: false,
  169. // Apply a 3D roll to links on hover
  170. rollingLinks: false,
  171. // Hides the address bar on mobile devices
  172. hideAddressBar: true,
  173. // Opens links in an iframe preview overlay
  174. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  175. // individually
  176. previewLinks: false,
  177. // Exposes the reveal.js API through window.postMessage
  178. postMessage: true,
  179. // Dispatches all reveal.js events to the parent window through postMessage
  180. postMessageEvents: false,
  181. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  182. focusBodyOnPageVisibilityChange: true,
  183. // Transition style
  184. transition: 'slide', // none/fade/slide/convex/concave/zoom
  185. // Transition speed
  186. transitionSpeed: 'default', // default/fast/slow
  187. // Transition style for full page slide backgrounds
  188. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  189. // Parallax background image
  190. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  191. // Parallax background size
  192. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  193. // Parallax background repeat
  194. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  195. // Parallax background position
  196. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  197. // Amount of pixels to move the parallax background per slide step
  198. parallaxBackgroundHorizontal: null,
  199. parallaxBackgroundVertical: null,
  200. // The maximum number of pages a single slide can expand onto when printing
  201. // to PDF, unlimited by default
  202. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  203. // Prints each fragment on a separate slide
  204. pdfSeparateFragments: true,
  205. // Offset used to reduce the height of content within exported PDF pages.
  206. // This exists to account for environment differences based on how you
  207. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  208. // on precisely the total height of the document whereas in-browser
  209. // printing has to end one pixel before.
  210. pdfPageHeightOffset: -1,
  211. // Number of slides away from the current that are visible
  212. viewDistance: 3,
  213. // The display mode that will be used to show slides
  214. display: 'block',
  215. // Hide cursor if inactive
  216. hideInactiveCursor: true,
  217. // Time before the cursor is hidden (in ms)
  218. hideCursorTime: 5000,
  219. // Script dependencies to load
  220. dependencies: []
  221. },
  222. // Flags if Reveal.initialize() has been called
  223. initialized = false,
  224. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  225. loaded = false,
  226. // Flags if the overview mode is currently active
  227. overview = false,
  228. // Holds the dimensions of our overview slides, including margins
  229. overviewSlideWidth = null,
  230. overviewSlideHeight = null,
  231. // The horizontal and vertical index of the currently active slide
  232. indexh,
  233. indexv,
  234. // The previous and current slide HTML elements
  235. previousSlide,
  236. currentSlide,
  237. previousBackground,
  238. // Remember which directions that the user has navigated towards
  239. hasNavigatedRight = false,
  240. hasNavigatedDown = false,
  241. // Slides may hold a data-state attribute which we pick up and apply
  242. // as a class to the body. This list contains the combined state of
  243. // all current slides.
  244. state = [],
  245. // The current scale of the presentation (see width/height config)
  246. scale = 1,
  247. // CSS transform that is currently applied to the slides container,
  248. // split into two groups
  249. slidesTransform = { layout: '', overview: '' },
  250. // Cached references to DOM elements
  251. dom = {},
  252. // A list of registered reveal.js plugins
  253. plugins = {},
  254. // List of asynchronously loaded reveal.js dependencies
  255. asyncDependencies = [],
  256. // Features supported by the browser, see #checkCapabilities()
  257. features = {},
  258. // Client is a mobile device, see #checkCapabilities()
  259. isMobileDevice,
  260. // Client is a desktop Chrome, see #checkCapabilities()
  261. isChrome,
  262. // Throttles mouse wheel navigation
  263. lastMouseWheelStep = 0,
  264. // Delays updates to the URL due to a Chrome thumbnailer bug
  265. writeURLTimeout = 0,
  266. // Is the mouse pointer currently hidden from view
  267. cursorHidden = false,
  268. // Timeout used to determine when the cursor is inactive
  269. cursorInactiveTimeout = 0,
  270. // Flags if the interaction event listeners are bound
  271. eventsAreBound = false,
  272. // The current auto-slide duration
  273. autoSlide = 0,
  274. // Auto slide properties
  275. autoSlidePlayer,
  276. autoSlideTimeout = 0,
  277. autoSlideStartTime = -1,
  278. autoSlidePaused = false,
  279. // Holds information about the currently ongoing touch input
  280. touch = {
  281. startX: 0,
  282. startY: 0,
  283. startCount: 0,
  284. captured: false,
  285. threshold: 40
  286. },
  287. // Holds information about the keyboard shortcuts
  288. keyboardShortcuts = {
  289. 'N , SPACE': 'Next slide',
  290. 'P': 'Previous slide',
  291. '← , H': 'Navigate left',
  292. '→ , L': 'Navigate right',
  293. '↑ , K': 'Navigate up',
  294. '↓ , J': 'Navigate down',
  295. 'Home , ⌘/CTRL ←': 'First slide',
  296. 'End , ⌘/CTRL →': 'Last slide',
  297. 'B , .': 'Pause',
  298. 'F': 'Fullscreen',
  299. 'ESC, O': 'Slide overview'
  300. },
  301. // Holds custom key code mappings
  302. registeredKeyBindings = {};
  303. /**
  304. * Starts up the presentation if the client is capable.
  305. */
  306. function initialize( options ) {
  307. // Make sure we only initialize once
  308. if( initialized === true ) return;
  309. initialized = true;
  310. checkCapabilities();
  311. if( !features.transforms2d && !features.transforms3d ) {
  312. document.body.setAttribute( 'class', 'no-transforms' );
  313. // Since JS won't be running any further, we load all lazy
  314. // loading elements upfront
  315. var images = toArray( document.getElementsByTagName( 'img' ) ),
  316. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  317. var lazyLoadable = images.concat( iframes );
  318. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  319. var element = lazyLoadable[i];
  320. if( element.getAttribute( 'data-src' ) ) {
  321. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  322. element.removeAttribute( 'data-src' );
  323. }
  324. }
  325. // If the browser doesn't support core features we won't be
  326. // using JavaScript to control the presentation
  327. return;
  328. }
  329. // Cache references to key DOM elements
  330. dom.wrapper = document.querySelector( '.reveal' );
  331. dom.slides = document.querySelector( '.reveal .slides' );
  332. // Force a layout when the whole page, incl fonts, has loaded
  333. window.addEventListener( 'load', layout, false );
  334. var query = Reveal.getQueryHash();
  335. // Do not accept new dependencies via query config to avoid
  336. // the potential of malicious script injection
  337. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  338. // Copy options over to our config object
  339. extend( config, options );
  340. extend( config, query );
  341. // Hide the address bar in mobile browsers
  342. hideAddressBar();
  343. // Loads dependencies and continues to #start() once done
  344. load();
  345. }
  346. /**
  347. * Inspect the client to see what it's capable of, this
  348. * should only happens once per runtime.
  349. */
  350. function checkCapabilities() {
  351. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  352. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  353. var testElement = document.createElement( 'div' );
  354. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  355. 'MozPerspective' in testElement.style ||
  356. 'msPerspective' in testElement.style ||
  357. 'OPerspective' in testElement.style ||
  358. 'perspective' in testElement.style;
  359. features.transforms2d = 'WebkitTransform' in testElement.style ||
  360. 'MozTransform' in testElement.style ||
  361. 'msTransform' in testElement.style ||
  362. 'OTransform' in testElement.style ||
  363. 'transform' in testElement.style;
  364. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  365. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  366. features.canvas = !!document.createElement( 'canvas' ).getContext;
  367. // Transitions in the overview are disabled in desktop and
  368. // Safari due to lag
  369. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  370. // Flags if we should use zoom instead of transform to scale
  371. // up slides. Zoom produces crisper results but has a lot of
  372. // xbrowser quirks so we only use it in whitelsited browsers.
  373. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  374. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  375. }
  376. /**
  377. * Loads the dependencies of reveal.js. Dependencies are
  378. * defined via the configuration option 'dependencies'
  379. * and will be loaded prior to starting/binding reveal.js.
  380. * Some dependencies may have an 'async' flag, if so they
  381. * will load after reveal.js has been started up.
  382. */
  383. function load() {
  384. var scripts = [],
  385. scriptsToLoad = 0;
  386. config.dependencies.forEach( function( s ) {
  387. // Load if there's no condition or the condition is truthy
  388. if( !s.condition || s.condition() ) {
  389. if( s.async ) {
  390. asyncDependencies.push( s );
  391. }
  392. else {
  393. scripts.push( s );
  394. }
  395. }
  396. } );
  397. if( scripts.length ) {
  398. scriptsToLoad = scripts.length;
  399. // Load synchronous scripts
  400. scripts.forEach( function( s ) {
  401. loadScript( s.src, function() {
  402. if( typeof s.callback === 'function' ) s.callback();
  403. if( --scriptsToLoad === 0 ) {
  404. initPlugins();
  405. }
  406. } );
  407. } );
  408. }
  409. else {
  410. initPlugins();
  411. }
  412. }
  413. /**
  414. * Initializes our plugins and waits for them to be ready
  415. * before proceeding.
  416. */
  417. function initPlugins() {
  418. var pluginsToInitialize = Object.keys( plugins ).length;
  419. // If there are no plugins, skip this step
  420. if( pluginsToInitialize === 0 ) {
  421. loadAsyncDependencies();
  422. }
  423. // ... otherwise initialize plugins
  424. else {
  425. var afterPlugInitialized = function() {
  426. if( --pluginsToInitialize === 0 ) {
  427. loadAsyncDependencies();
  428. }
  429. };
  430. for( var i in plugins ) {
  431. var plugin = plugins[i];
  432. // If the plugin has an 'init' method, invoke it
  433. if( typeof plugin.init === 'function' ) {
  434. var callback = plugin.init();
  435. // If the plugin returned a Promise, wait for it
  436. if( callback && typeof callback.then === 'function' ) {
  437. callback.then( afterPlugInitialized );
  438. }
  439. else {
  440. afterPlugInitialized();
  441. }
  442. }
  443. else {
  444. afterPlugInitialized();
  445. }
  446. }
  447. }
  448. }
  449. /**
  450. * Loads all async reveal.js dependencies.
  451. */
  452. function loadAsyncDependencies() {
  453. if( asyncDependencies.length ) {
  454. asyncDependencies.forEach( function( s ) {
  455. loadScript( s.src, s.callback );
  456. } );
  457. }
  458. start();
  459. }
  460. /**
  461. * Loads a JavaScript file from the given URL and executes it.
  462. *
  463. * @param {string} url Address of the .js file to load
  464. * @param {function} callback Method to invoke when the script
  465. * has loaded and executed
  466. */
  467. function loadScript( url, callback ) {
  468. var script = document.createElement( 'script' );
  469. script.type = 'text/javascript';
  470. script.async = false;
  471. script.defer = false;
  472. script.src = url;
  473. if( callback ) {
  474. // Success callback
  475. script.onload = script.onreadystatechange = function( event ) {
  476. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  477. // Kill event listeners
  478. script.onload = script.onreadystatechange = script.onerror = null;
  479. callback();
  480. }
  481. };
  482. // Error callback
  483. script.onerror = function( err ) {
  484. // Kill event listeners
  485. script.onload = script.onreadystatechange = script.onerror = null;
  486. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  487. };
  488. }
  489. // Append the script at the end of <head>
  490. var head = document.querySelector( 'head' );
  491. head.insertBefore( script, head.lastChild );
  492. }
  493. /**
  494. * Starts up reveal.js by binding input events and navigating
  495. * to the current URL deeplink if there is one.
  496. */
  497. function start() {
  498. loaded = true;
  499. // Make sure we've got all the DOM elements we need
  500. setupDOM();
  501. // Listen to messages posted to this window
  502. setupPostMessage();
  503. // Prevent the slides from being scrolled out of view
  504. setupScrollPrevention();
  505. // Resets all vertical slides so that only the first is visible
  506. resetVerticalSlides();
  507. // Updates the presentation to match the current configuration values
  508. configure();
  509. // Read the initial hash
  510. readURL();
  511. // Update all backgrounds
  512. updateBackground( true );
  513. // Notify listeners that the presentation is ready but use a 1ms
  514. // timeout to ensure it's not fired synchronously after #initialize()
  515. setTimeout( function() {
  516. // Enable transitions now that we're loaded
  517. dom.slides.classList.remove( 'no-transition' );
  518. dom.wrapper.classList.add( 'ready' );
  519. dispatchEvent( 'ready', {
  520. 'indexh': indexh,
  521. 'indexv': indexv,
  522. 'currentSlide': currentSlide
  523. } );
  524. }, 1 );
  525. // Special setup and config is required when printing to PDF
  526. if( isPrintingPDF() ) {
  527. removeEventListeners();
  528. // The document needs to have loaded for the PDF layout
  529. // measurements to be accurate
  530. if( document.readyState === 'complete' ) {
  531. setupPDF();
  532. }
  533. else {
  534. window.addEventListener( 'load', setupPDF );
  535. }
  536. }
  537. }
  538. /**
  539. * Finds and stores references to DOM elements which are
  540. * required by the presentation. If a required element is
  541. * not found, it is created.
  542. */
  543. function setupDOM() {
  544. // Prevent transitions while we're loading
  545. dom.slides.classList.add( 'no-transition' );
  546. if( isMobileDevice ) {
  547. dom.wrapper.classList.add( 'no-hover' );
  548. }
  549. else {
  550. dom.wrapper.classList.remove( 'no-hover' );
  551. }
  552. if( /iphone/gi.test( UA ) ) {
  553. dom.wrapper.classList.add( 'ua-iphone' );
  554. }
  555. else {
  556. dom.wrapper.classList.remove( 'ua-iphone' );
  557. }
  558. // Background element
  559. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  560. // Progress bar
  561. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  562. dom.progressbar = dom.progress.querySelector( 'span' );
  563. // Arrow controls
  564. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  565. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  566. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  567. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  568. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  569. // Slide number
  570. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  571. // Element containing notes that are visible to the audience
  572. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  573. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  574. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  575. // Overlay graphic which is displayed during the paused mode
  576. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  577. dom.wrapper.setAttribute( 'role', 'application' );
  578. // There can be multiple instances of controls throughout the page
  579. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  580. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  581. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  582. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  583. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  584. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  585. // The right and down arrows in the standard reveal.js controls
  586. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  587. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  588. dom.statusDiv = createStatusDiv();
  589. }
  590. /**
  591. * Creates a hidden div with role aria-live to announce the
  592. * current slide content. Hide the div off-screen to make it
  593. * available only to Assistive Technologies.
  594. *
  595. * @return {HTMLElement}
  596. */
  597. function createStatusDiv() {
  598. var statusDiv = document.getElementById( 'aria-status-div' );
  599. if( !statusDiv ) {
  600. statusDiv = document.createElement( 'div' );
  601. statusDiv.style.position = 'absolute';
  602. statusDiv.style.height = '1px';
  603. statusDiv.style.width = '1px';
  604. statusDiv.style.overflow = 'hidden';
  605. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  606. statusDiv.setAttribute( 'id', 'aria-status-div' );
  607. statusDiv.setAttribute( 'aria-live', 'polite' );
  608. statusDiv.setAttribute( 'aria-atomic','true' );
  609. dom.wrapper.appendChild( statusDiv );
  610. }
  611. return statusDiv;
  612. }
  613. /**
  614. * Converts the given HTML element into a string of text
  615. * that can be announced to a screen reader. Hidden
  616. * elements are excluded.
  617. */
  618. function getStatusText( node ) {
  619. var text = '';
  620. // Text node
  621. if( node.nodeType === 3 ) {
  622. text += node.textContent;
  623. }
  624. // Element node
  625. else if( node.nodeType === 1 ) {
  626. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  627. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  628. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  629. toArray( node.childNodes ).forEach( function( child ) {
  630. text += getStatusText( child );
  631. } );
  632. }
  633. }
  634. return text;
  635. }
  636. /**
  637. * Configures the presentation for printing to a static
  638. * PDF.
  639. */
  640. function setupPDF() {
  641. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  642. // Dimensions of the PDF pages
  643. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  644. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  645. // Dimensions of slides within the pages
  646. var slideWidth = slideSize.width,
  647. slideHeight = slideSize.height;
  648. // Let the browser know what page size we want to print
  649. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  650. // Limit the size of certain elements to the dimensions of the slide
  651. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  652. document.body.classList.add( 'print-pdf' );
  653. document.body.style.width = pageWidth + 'px';
  654. document.body.style.height = pageHeight + 'px';
  655. // Make sure stretch elements fit on slide
  656. layoutSlideContents( slideWidth, slideHeight );
  657. // Add each slide's index as attributes on itself, we need these
  658. // indices to generate slide numbers below
  659. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  660. hslide.setAttribute( 'data-index-h', h );
  661. if( hslide.classList.contains( 'stack' ) ) {
  662. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  663. vslide.setAttribute( 'data-index-h', h );
  664. vslide.setAttribute( 'data-index-v', v );
  665. } );
  666. }
  667. } );
  668. // Slide and slide background layout
  669. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  670. // Vertical stacks are not centred since their section
  671. // children will be
  672. if( slide.classList.contains( 'stack' ) === false ) {
  673. // Center the slide inside of the page, giving the slide some margin
  674. var left = ( pageWidth - slideWidth ) / 2,
  675. top = ( pageHeight - slideHeight ) / 2;
  676. var contentHeight = slide.scrollHeight;
  677. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  678. // Adhere to configured pages per slide limit
  679. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  680. // Center slides vertically
  681. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  682. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  683. }
  684. // Wrap the slide in a page element and hide its overflow
  685. // so that no page ever flows onto another
  686. var page = document.createElement( 'div' );
  687. page.className = 'pdf-page';
  688. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  689. slide.parentNode.insertBefore( page, slide );
  690. page.appendChild( slide );
  691. // Position the slide inside of the page
  692. slide.style.left = left + 'px';
  693. slide.style.top = top + 'px';
  694. slide.style.width = slideWidth + 'px';
  695. if( slide.slideBackgroundElement ) {
  696. page.insertBefore( slide.slideBackgroundElement, slide );
  697. }
  698. // Inject notes if `showNotes` is enabled
  699. if( config.showNotes ) {
  700. // Are there notes for this slide?
  701. var notes = getSlideNotes( slide );
  702. if( notes ) {
  703. var notesSpacing = 8;
  704. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  705. var notesElement = document.createElement( 'div' );
  706. notesElement.classList.add( 'speaker-notes' );
  707. notesElement.classList.add( 'speaker-notes-pdf' );
  708. notesElement.setAttribute( 'data-layout', notesLayout );
  709. notesElement.innerHTML = notes;
  710. if( notesLayout === 'separate-page' ) {
  711. page.parentNode.insertBefore( notesElement, page.nextSibling );
  712. }
  713. else {
  714. notesElement.style.left = notesSpacing + 'px';
  715. notesElement.style.bottom = notesSpacing + 'px';
  716. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  717. page.appendChild( notesElement );
  718. }
  719. }
  720. }
  721. // Inject slide numbers if `slideNumbers` are enabled
  722. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  723. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  724. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  725. var numberElement = document.createElement( 'div' );
  726. numberElement.classList.add( 'slide-number' );
  727. numberElement.classList.add( 'slide-number-pdf' );
  728. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  729. page.appendChild( numberElement );
  730. }
  731. // Copy page and show fragments one after another
  732. if( config.pdfSeparateFragments ) {
  733. // Each fragment 'group' is an array containing one or more
  734. // fragments. Multiple fragments that appear at the same time
  735. // are part of the same group.
  736. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  737. var previousFragmentStep;
  738. var previousPage;
  739. fragmentGroups.forEach( function( fragments ) {
  740. // Remove 'current-fragment' from the previous group
  741. if( previousFragmentStep ) {
  742. previousFragmentStep.forEach( function( fragment ) {
  743. fragment.classList.remove( 'current-fragment' );
  744. } );
  745. }
  746. // Show the fragments for the current index
  747. fragments.forEach( function( fragment ) {
  748. fragment.classList.add( 'visible', 'current-fragment' );
  749. } );
  750. // Create a separate page for the current fragment state
  751. var clonedPage = page.cloneNode( true );
  752. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  753. previousFragmentStep = fragments;
  754. previousPage = clonedPage;
  755. } );
  756. // Reset the first/original page so that all fragments are hidden
  757. fragmentGroups.forEach( function( fragments ) {
  758. fragments.forEach( function( fragment ) {
  759. fragment.classList.remove( 'visible', 'current-fragment' );
  760. } );
  761. } );
  762. }
  763. // Show all fragments
  764. else {
  765. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  766. fragment.classList.add( 'visible' );
  767. } );
  768. }
  769. }
  770. } );
  771. // Notify subscribers that the PDF layout is good to go
  772. dispatchEvent( 'pdf-ready' );
  773. }
  774. /**
  775. * This is an unfortunate necessity. Some actions – such as
  776. * an input field being focused in an iframe or using the
  777. * keyboard to expand text selection beyond the bounds of
  778. * a slide – can trigger our content to be pushed out of view.
  779. * This scrolling can not be prevented by hiding overflow in
  780. * CSS (we already do) so we have to resort to repeatedly
  781. * checking if the slides have been offset :(
  782. */
  783. function setupScrollPrevention() {
  784. setInterval( function() {
  785. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  786. dom.wrapper.scrollTop = 0;
  787. dom.wrapper.scrollLeft = 0;
  788. }
  789. }, 1000 );
  790. }
  791. /**
  792. * Creates an HTML element and returns a reference to it.
  793. * If the element already exists the existing instance will
  794. * be returned.
  795. *
  796. * @param {HTMLElement} container
  797. * @param {string} tagname
  798. * @param {string} classname
  799. * @param {string} innerHTML
  800. *
  801. * @return {HTMLElement}
  802. */
  803. function createSingletonNode( container, tagname, classname, innerHTML ) {
  804. // Find all nodes matching the description
  805. var nodes = container.querySelectorAll( '.' + classname );
  806. // Check all matches to find one which is a direct child of
  807. // the specified container
  808. for( var i = 0; i < nodes.length; i++ ) {
  809. var testNode = nodes[i];
  810. if( testNode.parentNode === container ) {
  811. return testNode;
  812. }
  813. }
  814. // If no node was found, create it now
  815. var node = document.createElement( tagname );
  816. node.className = classname;
  817. if( typeof innerHTML === 'string' ) {
  818. node.innerHTML = innerHTML;
  819. }
  820. container.appendChild( node );
  821. return node;
  822. }
  823. /**
  824. * Creates the slide background elements and appends them
  825. * to the background container. One element is created per
  826. * slide no matter if the given slide has visible background.
  827. */
  828. function createBackgrounds() {
  829. var printMode = isPrintingPDF();
  830. // Clear prior backgrounds
  831. dom.background.innerHTML = '';
  832. dom.background.classList.add( 'no-transition' );
  833. // Iterate over all horizontal slides
  834. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  835. var backgroundStack = createBackground( slideh, dom.background );
  836. // Iterate over all vertical slides
  837. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  838. createBackground( slidev, backgroundStack );
  839. backgroundStack.classList.add( 'stack' );
  840. } );
  841. } );
  842. // Add parallax background if specified
  843. if( config.parallaxBackgroundImage ) {
  844. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  845. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  846. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  847. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  848. // Make sure the below properties are set on the element - these properties are
  849. // needed for proper transitions to be set on the element via CSS. To remove
  850. // annoying background slide-in effect when the presentation starts, apply
  851. // these properties after short time delay
  852. setTimeout( function() {
  853. dom.wrapper.classList.add( 'has-parallax-background' );
  854. }, 1 );
  855. }
  856. else {
  857. dom.background.style.backgroundImage = '';
  858. dom.wrapper.classList.remove( 'has-parallax-background' );
  859. }
  860. }
  861. /**
  862. * Creates a background for the given slide.
  863. *
  864. * @param {HTMLElement} slide
  865. * @param {HTMLElement} container The element that the background
  866. * should be appended to
  867. * @return {HTMLElement} New background div
  868. */
  869. function createBackground( slide, container ) {
  870. // Main slide background element
  871. var element = document.createElement( 'div' );
  872. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  873. // Inner background element that wraps images/videos/iframes
  874. var contentElement = document.createElement( 'div' );
  875. contentElement.className = 'slide-background-content';
  876. element.appendChild( contentElement );
  877. container.appendChild( element );
  878. slide.slideBackgroundElement = element;
  879. slide.slideBackgroundContentElement = contentElement;
  880. // Syncs the background to reflect all current background settings
  881. syncBackground( slide );
  882. return element;
  883. }
  884. /**
  885. * Renders all of the visual properties of a slide background
  886. * based on the various background attributes.
  887. *
  888. * @param {HTMLElement} slide
  889. */
  890. function syncBackground( slide ) {
  891. var element = slide.slideBackgroundElement,
  892. contentElement = slide.slideBackgroundContentElement;
  893. // Reset the prior background state in case this is not the
  894. // initial sync
  895. slide.classList.remove( 'has-dark-background' );
  896. slide.classList.remove( 'has-light-background' );
  897. element.removeAttribute( 'data-loaded' );
  898. element.removeAttribute( 'data-background-hash' );
  899. element.removeAttribute( 'data-background-size' );
  900. element.removeAttribute( 'data-background-transition' );
  901. element.style.backgroundColor = '';
  902. contentElement.style.backgroundSize = '';
  903. contentElement.style.backgroundRepeat = '';
  904. contentElement.style.backgroundPosition = '';
  905. contentElement.style.backgroundImage = '';
  906. contentElement.style.opacity = '';
  907. contentElement.innerHTML = '';
  908. var data = {
  909. background: slide.getAttribute( 'data-background' ),
  910. backgroundSize: slide.getAttribute( 'data-background-size' ),
  911. backgroundImage: slide.getAttribute( 'data-background-image' ),
  912. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  913. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  914. backgroundColor: slide.getAttribute( 'data-background-color' ),
  915. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  916. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  917. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  918. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  919. };
  920. if( data.background ) {
  921. // Auto-wrap image urls in url(...)
  922. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  923. slide.setAttribute( 'data-background-image', data.background );
  924. }
  925. else {
  926. element.style.background = data.background;
  927. }
  928. }
  929. // Create a hash for this combination of background settings.
  930. // This is used to determine when two slide backgrounds are
  931. // the same.
  932. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  933. element.setAttribute( 'data-background-hash', data.background +
  934. data.backgroundSize +
  935. data.backgroundImage +
  936. data.backgroundVideo +
  937. data.backgroundIframe +
  938. data.backgroundColor +
  939. data.backgroundRepeat +
  940. data.backgroundPosition +
  941. data.backgroundTransition +
  942. data.backgroundOpacity );
  943. }
  944. // Additional and optional background properties
  945. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  946. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  947. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  948. // Background image options are set on the content wrapper
  949. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  950. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  951. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  952. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  953. // If this slide has a background color, we add a class that
  954. // signals if it is light or dark. If the slide has no background
  955. // color, no class will be added
  956. var contrastColor = data.backgroundColor;
  957. // If no bg color was found, check the computed background
  958. if( !contrastColor ) {
  959. var computedBackgroundStyle = window.getComputedStyle( element );
  960. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  961. contrastColor = computedBackgroundStyle.backgroundColor;
  962. }
  963. }
  964. if( contrastColor ) {
  965. var rgb = colorToRgb( contrastColor );
  966. // Ignore fully transparent backgrounds. Some browsers return
  967. // rgba(0,0,0,0) when reading the computed background color of
  968. // an element with no background
  969. if( rgb && rgb.a !== 0 ) {
  970. if( colorBrightness( contrastColor ) < 128 ) {
  971. slide.classList.add( 'has-dark-background' );
  972. }
  973. else {
  974. slide.classList.add( 'has-light-background' );
  975. }
  976. }
  977. }
  978. }
  979. /**
  980. * Registers a listener to postMessage events, this makes it
  981. * possible to call all reveal.js API methods from another
  982. * window. For example:
  983. *
  984. * revealWindow.postMessage( JSON.stringify({
  985. * method: 'slide',
  986. * args: [ 2 ]
  987. * }), '*' );
  988. */
  989. function setupPostMessage() {
  990. if( config.postMessage ) {
  991. window.addEventListener( 'message', function ( event ) {
  992. var data = event.data;
  993. // Make sure we're dealing with JSON
  994. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  995. data = JSON.parse( data );
  996. // Check if the requested method can be found
  997. if( data.method && typeof Reveal[data.method] === 'function' ) {
  998. Reveal[data.method].apply( Reveal, data.args );
  999. }
  1000. }
  1001. }, false );
  1002. }
  1003. }
  1004. /**
  1005. * Applies the configuration settings from the config
  1006. * object. May be called multiple times.
  1007. *
  1008. * @param {object} options
  1009. */
  1010. function configure( options ) {
  1011. var oldTransition = config.transition;
  1012. // New config options may be passed when this method
  1013. // is invoked through the API after initialization
  1014. if( typeof options === 'object' ) extend( config, options );
  1015. // Abort if reveal.js hasn't finished loading, config
  1016. // changes will be applied automatically once loading
  1017. // finishes
  1018. if( loaded === false ) return;
  1019. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1020. // Remove the previously configured transition class
  1021. dom.wrapper.classList.remove( oldTransition );
  1022. // Force linear transition based on browser capabilities
  1023. if( features.transforms3d === false ) config.transition = 'linear';
  1024. dom.wrapper.classList.add( config.transition );
  1025. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1026. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1027. dom.controls.style.display = config.controls ? 'block' : 'none';
  1028. dom.progress.style.display = config.progress ? 'block' : 'none';
  1029. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1030. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1031. if( config.shuffle ) {
  1032. shuffle();
  1033. }
  1034. if( config.rtl ) {
  1035. dom.wrapper.classList.add( 'rtl' );
  1036. }
  1037. else {
  1038. dom.wrapper.classList.remove( 'rtl' );
  1039. }
  1040. if( config.center ) {
  1041. dom.wrapper.classList.add( 'center' );
  1042. }
  1043. else {
  1044. dom.wrapper.classList.remove( 'center' );
  1045. }
  1046. // Exit the paused mode if it was configured off
  1047. if( config.pause === false ) {
  1048. resume();
  1049. }
  1050. if( config.showNotes ) {
  1051. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1052. }
  1053. if( config.mouseWheel ) {
  1054. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1055. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1056. }
  1057. else {
  1058. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1059. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1060. }
  1061. // Rolling 3D links
  1062. if( config.rollingLinks ) {
  1063. enableRollingLinks();
  1064. }
  1065. else {
  1066. disableRollingLinks();
  1067. }
  1068. // Auto-hide the mouse pointer when its inactive
  1069. if( config.hideInactiveCursor ) {
  1070. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1071. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1072. }
  1073. else {
  1074. showCursor();
  1075. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1076. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1077. }
  1078. // Iframe link previews
  1079. if( config.previewLinks ) {
  1080. enablePreviewLinks();
  1081. disablePreviewLinks( '[data-preview-link=false]' );
  1082. }
  1083. else {
  1084. disablePreviewLinks();
  1085. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1086. }
  1087. // Remove existing auto-slide controls
  1088. if( autoSlidePlayer ) {
  1089. autoSlidePlayer.destroy();
  1090. autoSlidePlayer = null;
  1091. }
  1092. // Generate auto-slide controls if needed
  1093. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1094. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1095. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1096. } );
  1097. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1098. autoSlidePaused = false;
  1099. }
  1100. // When fragments are turned off they should be visible
  1101. if( config.fragments === false ) {
  1102. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1103. element.classList.add( 'visible' );
  1104. element.classList.remove( 'current-fragment' );
  1105. } );
  1106. }
  1107. // Slide numbers
  1108. var slideNumberDisplay = 'none';
  1109. if( config.slideNumber && !isPrintingPDF() ) {
  1110. if( config.showSlideNumber === 'all' ) {
  1111. slideNumberDisplay = 'block';
  1112. }
  1113. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1114. slideNumberDisplay = 'block';
  1115. }
  1116. }
  1117. dom.slideNumber.style.display = slideNumberDisplay;
  1118. // Add the navigation mode to the DOM so we can adjust styling
  1119. if( config.navigationMode !== 'default' ) {
  1120. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1121. }
  1122. else {
  1123. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1124. }
  1125. sync();
  1126. }
  1127. /**
  1128. * Binds all event listeners.
  1129. */
  1130. function addEventListeners() {
  1131. eventsAreBound = true;
  1132. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1133. window.addEventListener( 'resize', onWindowResize, false );
  1134. if( config.touch ) {
  1135. if( 'onpointerdown' in window ) {
  1136. // Use W3C pointer events
  1137. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1138. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1139. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1140. }
  1141. else if( window.navigator.msPointerEnabled ) {
  1142. // IE 10 uses prefixed version of pointer events
  1143. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1144. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1145. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1146. }
  1147. else {
  1148. // Fall back to touch events
  1149. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1150. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1151. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1152. }
  1153. }
  1154. if( config.keyboard ) {
  1155. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1156. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1157. }
  1158. if( config.progress && dom.progress ) {
  1159. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1160. }
  1161. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1162. if( config.focusBodyOnPageVisibilityChange ) {
  1163. var visibilityChange;
  1164. if( 'hidden' in document ) {
  1165. visibilityChange = 'visibilitychange';
  1166. }
  1167. else if( 'msHidden' in document ) {
  1168. visibilityChange = 'msvisibilitychange';
  1169. }
  1170. else if( 'webkitHidden' in document ) {
  1171. visibilityChange = 'webkitvisibilitychange';
  1172. }
  1173. if( visibilityChange ) {
  1174. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1175. }
  1176. }
  1177. // Listen to both touch and click events, in case the device
  1178. // supports both
  1179. var pointerEvents = [ 'touchstart', 'click' ];
  1180. // Only support touch for Android, fixes double navigations in
  1181. // stock browser
  1182. if( UA.match( /android/gi ) ) {
  1183. pointerEvents = [ 'touchstart' ];
  1184. }
  1185. pointerEvents.forEach( function( eventName ) {
  1186. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1187. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1188. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1189. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1190. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1191. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1192. } );
  1193. }
  1194. /**
  1195. * Unbinds all event listeners.
  1196. */
  1197. function removeEventListeners() {
  1198. eventsAreBound = false;
  1199. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1200. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1201. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1202. window.removeEventListener( 'resize', onWindowResize, false );
  1203. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1204. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1205. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1206. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1207. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1208. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1209. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1210. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1211. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1212. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1213. if ( config.progress && dom.progress ) {
  1214. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1215. }
  1216. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1217. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1218. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1219. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1220. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1221. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1222. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1223. } );
  1224. }
  1225. /**
  1226. * Registers a new plugin with this reveal.js instance.
  1227. *
  1228. * reveal.js waits for all regisered plugins to initialize
  1229. * before considering itself ready, as long as the plugin
  1230. * is registered before calling `Reveal.initialize()`.
  1231. */
  1232. function registerPlugin( id, plugin ) {
  1233. if( plugins[id] === undefined ) {
  1234. plugins[id] = plugin;
  1235. // If a plugin is registered after reveal.js is loaded,
  1236. // initialize it right away
  1237. if( loaded && typeof plugin.init === 'function' ) {
  1238. plugin.init();
  1239. }
  1240. }
  1241. else {
  1242. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1243. }
  1244. }
  1245. /**
  1246. * Add a custom key binding with optional description to
  1247. * be added to the help screen.
  1248. */
  1249. function addKeyBinding( binding, callback ) {
  1250. if( typeof binding === 'object' && binding.keyCode ) {
  1251. registeredKeyBindings[binding.keyCode] = {
  1252. callback: callback,
  1253. key: binding.key,
  1254. description: binding.description
  1255. };
  1256. }
  1257. else {
  1258. registeredKeyBindings[binding] = {
  1259. callback: callback,
  1260. key: null,
  1261. description: null
  1262. };
  1263. }
  1264. }
  1265. /**
  1266. * Removes the specified custom key binding.
  1267. */
  1268. function removeKeyBinding( keyCode ) {
  1269. delete registeredKeyBindings[keyCode];
  1270. }
  1271. /**
  1272. * Extend object a with the properties of object b.
  1273. * If there's a conflict, object b takes precedence.
  1274. *
  1275. * @param {object} a
  1276. * @param {object} b
  1277. */
  1278. function extend( a, b ) {
  1279. for( var i in b ) {
  1280. a[ i ] = b[ i ];
  1281. }
  1282. return a;
  1283. }
  1284. /**
  1285. * Converts the target object to an array.
  1286. *
  1287. * @param {object} o
  1288. * @return {object[]}
  1289. */
  1290. function toArray( o ) {
  1291. return Array.prototype.slice.call( o );
  1292. }
  1293. /**
  1294. * Utility for deserializing a value.
  1295. *
  1296. * @param {*} value
  1297. * @return {*}
  1298. */
  1299. function deserialize( value ) {
  1300. if( typeof value === 'string' ) {
  1301. if( value === 'null' ) return null;
  1302. else if( value === 'true' ) return true;
  1303. else if( value === 'false' ) return false;
  1304. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1305. }
  1306. return value;
  1307. }
  1308. /**
  1309. * Measures the distance in pixels between point a
  1310. * and point b.
  1311. *
  1312. * @param {object} a point with x/y properties
  1313. * @param {object} b point with x/y properties
  1314. *
  1315. * @return {number}
  1316. */
  1317. function distanceBetween( a, b ) {
  1318. var dx = a.x - b.x,
  1319. dy = a.y - b.y;
  1320. return Math.sqrt( dx*dx + dy*dy );
  1321. }
  1322. /**
  1323. * Applies a CSS transform to the target element.
  1324. *
  1325. * @param {HTMLElement} element
  1326. * @param {string} transform
  1327. */
  1328. function transformElement( element, transform ) {
  1329. element.style.WebkitTransform = transform;
  1330. element.style.MozTransform = transform;
  1331. element.style.msTransform = transform;
  1332. element.style.transform = transform;
  1333. }
  1334. /**
  1335. * Applies CSS transforms to the slides container. The container
  1336. * is transformed from two separate sources: layout and the overview
  1337. * mode.
  1338. *
  1339. * @param {object} transforms
  1340. */
  1341. function transformSlides( transforms ) {
  1342. // Pick up new transforms from arguments
  1343. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1344. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1345. // Apply the transforms to the slides container
  1346. if( slidesTransform.layout ) {
  1347. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1348. }
  1349. else {
  1350. transformElement( dom.slides, slidesTransform.overview );
  1351. }
  1352. }
  1353. /**
  1354. * Injects the given CSS styles into the DOM.
  1355. *
  1356. * @param {string} value
  1357. */
  1358. function injectStyleSheet( value ) {
  1359. var tag = document.createElement( 'style' );
  1360. tag.type = 'text/css';
  1361. if( tag.styleSheet ) {
  1362. tag.styleSheet.cssText = value;
  1363. }
  1364. else {
  1365. tag.appendChild( document.createTextNode( value ) );
  1366. }
  1367. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1368. }
  1369. /**
  1370. * Find the closest parent that matches the given
  1371. * selector.
  1372. *
  1373. * @param {HTMLElement} target The child element
  1374. * @param {String} selector The CSS selector to match
  1375. * the parents against
  1376. *
  1377. * @return {HTMLElement} The matched parent or null
  1378. * if no matching parent was found
  1379. */
  1380. function closestParent( target, selector ) {
  1381. var parent = target.parentNode;
  1382. while( parent ) {
  1383. // There's some overhead doing this each time, we don't
  1384. // want to rewrite the element prototype but should still
  1385. // be enough to feature detect once at startup...
  1386. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1387. // If we find a match, we're all set
  1388. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1389. return parent;
  1390. }
  1391. // Keep searching
  1392. parent = parent.parentNode;
  1393. }
  1394. return null;
  1395. }
  1396. /**
  1397. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1398. *
  1399. * @param {string} color The string representation of a color
  1400. * @example
  1401. * colorToRgb('#000');
  1402. * @example
  1403. * colorToRgb('#000000');
  1404. * @example
  1405. * colorToRgb('rgb(0,0,0)');
  1406. * @example
  1407. * colorToRgb('rgba(0,0,0)');
  1408. *
  1409. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1410. */
  1411. function colorToRgb( color ) {
  1412. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1413. if( hex3 && hex3[1] ) {
  1414. hex3 = hex3[1];
  1415. return {
  1416. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1417. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1418. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1419. };
  1420. }
  1421. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1422. if( hex6 && hex6[1] ) {
  1423. hex6 = hex6[1];
  1424. return {
  1425. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1426. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1427. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1428. };
  1429. }
  1430. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1431. if( rgb ) {
  1432. return {
  1433. r: parseInt( rgb[1], 10 ),
  1434. g: parseInt( rgb[2], 10 ),
  1435. b: parseInt( rgb[3], 10 )
  1436. };
  1437. }
  1438. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1439. if( rgba ) {
  1440. return {
  1441. r: parseInt( rgba[1], 10 ),
  1442. g: parseInt( rgba[2], 10 ),
  1443. b: parseInt( rgba[3], 10 ),
  1444. a: parseFloat( rgba[4] )
  1445. };
  1446. }
  1447. return null;
  1448. }
  1449. /**
  1450. * Calculates brightness on a scale of 0-255.
  1451. *
  1452. * @param {string} color See colorToRgb for supported formats.
  1453. * @see {@link colorToRgb}
  1454. */
  1455. function colorBrightness( color ) {
  1456. if( typeof color === 'string' ) color = colorToRgb( color );
  1457. if( color ) {
  1458. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1459. }
  1460. return null;
  1461. }
  1462. /**
  1463. * Returns the remaining height within the parent of the
  1464. * target element.
  1465. *
  1466. * remaining height = [ configured parent height ] - [ current parent height ]
  1467. *
  1468. * @param {HTMLElement} element
  1469. * @param {number} [height]
  1470. */
  1471. function getRemainingHeight( element, height ) {
  1472. height = height || 0;
  1473. if( element ) {
  1474. var newHeight, oldHeight = element.style.height;
  1475. // Change the .stretch element height to 0 in order find the height of all
  1476. // the other elements
  1477. element.style.height = '0px';
  1478. // In Overview mode, the parent (.slide) height is set of 700px.
  1479. // Restore it temporarily to its natural height.
  1480. element.parentNode.style.height = 'auto';
  1481. newHeight = height - element.parentNode.offsetHeight;
  1482. // Restore the old height, just in case
  1483. element.style.height = oldHeight + 'px';
  1484. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1485. element.parentNode.style.removeProperty('height');
  1486. return newHeight;
  1487. }
  1488. return height;
  1489. }
  1490. /**
  1491. * Checks if this instance is being used to print a PDF.
  1492. */
  1493. function isPrintingPDF() {
  1494. return ( /print-pdf/gi ).test( window.location.search );
  1495. }
  1496. /**
  1497. * Hides the address bar if we're on a mobile device.
  1498. */
  1499. function hideAddressBar() {
  1500. if( config.hideAddressBar && isMobileDevice ) {
  1501. // Events that should trigger the address bar to hide
  1502. window.addEventListener( 'load', removeAddressBar, false );
  1503. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1504. }
  1505. }
  1506. /**
  1507. * Causes the address bar to hide on mobile devices,
  1508. * more vertical space ftw.
  1509. */
  1510. function removeAddressBar() {
  1511. setTimeout( function() {
  1512. window.scrollTo( 0, 1 );
  1513. }, 10 );
  1514. }
  1515. /**
  1516. * Dispatches an event of the specified type from the
  1517. * reveal DOM element.
  1518. */
  1519. function dispatchEvent( type, args ) {
  1520. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1521. event.initEvent( type, true, true );
  1522. extend( event, args );
  1523. dom.wrapper.dispatchEvent( event );
  1524. // If we're in an iframe, post each reveal.js event to the
  1525. // parent window. Used by the notes plugin
  1526. if( config.postMessageEvents && window.parent !== window.self ) {
  1527. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1528. }
  1529. }
  1530. /**
  1531. * Wrap all links in 3D goodness.
  1532. */
  1533. function enableRollingLinks() {
  1534. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1535. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1536. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1537. var anchor = anchors[i];
  1538. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1539. var span = document.createElement('span');
  1540. span.setAttribute('data-title', anchor.text);
  1541. span.innerHTML = anchor.innerHTML;
  1542. anchor.classList.add( 'roll' );
  1543. anchor.innerHTML = '';
  1544. anchor.appendChild(span);
  1545. }
  1546. }
  1547. }
  1548. }
  1549. /**
  1550. * Unwrap all 3D links.
  1551. */
  1552. function disableRollingLinks() {
  1553. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1554. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1555. var anchor = anchors[i];
  1556. var span = anchor.querySelector( 'span' );
  1557. if( span ) {
  1558. anchor.classList.remove( 'roll' );
  1559. anchor.innerHTML = span.innerHTML;
  1560. }
  1561. }
  1562. }
  1563. /**
  1564. * Bind preview frame links.
  1565. *
  1566. * @param {string} [selector=a] - selector for anchors
  1567. */
  1568. function enablePreviewLinks( selector ) {
  1569. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1570. anchors.forEach( function( element ) {
  1571. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1572. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1573. }
  1574. } );
  1575. }
  1576. /**
  1577. * Unbind preview frame links.
  1578. */
  1579. function disablePreviewLinks( selector ) {
  1580. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1581. anchors.forEach( function( element ) {
  1582. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1583. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1584. }
  1585. } );
  1586. }
  1587. /**
  1588. * Opens a preview window for the target URL.
  1589. *
  1590. * @param {string} url - url for preview iframe src
  1591. */
  1592. function showPreview( url ) {
  1593. closeOverlay();
  1594. dom.overlay = document.createElement( 'div' );
  1595. dom.overlay.classList.add( 'overlay' );
  1596. dom.overlay.classList.add( 'overlay-preview' );
  1597. dom.wrapper.appendChild( dom.overlay );
  1598. dom.overlay.innerHTML = [
  1599. '<header>',
  1600. '<a class="close" href="#"><span class="icon"></span></a>',
  1601. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1602. '</header>',
  1603. '<div class="spinner"></div>',
  1604. '<div class="viewport">',
  1605. '<iframe src="'+ url +'"></iframe>',
  1606. '<small class="viewport-inner">',
  1607. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1608. '</small>',
  1609. '</div>'
  1610. ].join('');
  1611. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1612. dom.overlay.classList.add( 'loaded' );
  1613. }, false );
  1614. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1615. closeOverlay();
  1616. event.preventDefault();
  1617. }, false );
  1618. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1619. closeOverlay();
  1620. }, false );
  1621. setTimeout( function() {
  1622. dom.overlay.classList.add( 'visible' );
  1623. }, 1 );
  1624. }
  1625. /**
  1626. * Open or close help overlay window.
  1627. *
  1628. * @param {Boolean} [override] Flag which overrides the
  1629. * toggle logic and forcibly sets the desired state. True means
  1630. * help is open, false means it's closed.
  1631. */
  1632. function toggleHelp( override ){
  1633. if( typeof override === 'boolean' ) {
  1634. override ? showHelp() : closeOverlay();
  1635. }
  1636. else {
  1637. if( dom.overlay ) {
  1638. closeOverlay();
  1639. }
  1640. else {
  1641. showHelp();
  1642. }
  1643. }
  1644. }
  1645. /**
  1646. * Opens an overlay window with help material.
  1647. */
  1648. function showHelp() {
  1649. if( config.help ) {
  1650. closeOverlay();
  1651. dom.overlay = document.createElement( 'div' );
  1652. dom.overlay.classList.add( 'overlay' );
  1653. dom.overlay.classList.add( 'overlay-help' );
  1654. dom.wrapper.appendChild( dom.overlay );
  1655. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1656. html += '<table><th>KEY</th><th>ACTION</th>';
  1657. for( var key in keyboardShortcuts ) {
  1658. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1659. }
  1660. // Add custom key bindings that have associated descriptions
  1661. for( var binding in registeredKeyBindings ) {
  1662. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1663. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1664. }
  1665. }
  1666. html += '</table>';
  1667. dom.overlay.innerHTML = [
  1668. '<header>',
  1669. '<a class="close" href="#"><span class="icon"></span></a>',
  1670. '</header>',
  1671. '<div class="viewport">',
  1672. '<div class="viewport-inner">'+ html +'</div>',
  1673. '</div>'
  1674. ].join('');
  1675. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1676. closeOverlay();
  1677. event.preventDefault();
  1678. }, false );
  1679. setTimeout( function() {
  1680. dom.overlay.classList.add( 'visible' );
  1681. }, 1 );
  1682. }
  1683. }
  1684. /**
  1685. * Closes any currently open overlay.
  1686. */
  1687. function closeOverlay() {
  1688. if( dom.overlay ) {
  1689. dom.overlay.parentNode.removeChild( dom.overlay );
  1690. dom.overlay = null;
  1691. }
  1692. }
  1693. /**
  1694. * Applies JavaScript-controlled layout rules to the
  1695. * presentation.
  1696. */
  1697. function layout() {
  1698. if( dom.wrapper && !isPrintingPDF() ) {
  1699. if( !config.disableLayout ) {
  1700. // On some mobile devices '100vh' is taller than the visible
  1701. // viewport which leads to part of the presentation being
  1702. // cut off. To work around this we define our own '--vh' custom
  1703. // property where 100x adds up to the correct height.
  1704. //
  1705. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1706. if( isMobileDevice ) {
  1707. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1708. }
  1709. var size = getComputedSlideSize();
  1710. var oldScale = scale;
  1711. // Layout the contents of the slides
  1712. layoutSlideContents( config.width, config.height );
  1713. dom.slides.style.width = size.width + 'px';
  1714. dom.slides.style.height = size.height + 'px';
  1715. // Determine scale of content to fit within available space
  1716. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1717. // Respect max/min scale settings
  1718. scale = Math.max( scale, config.minScale );
  1719. scale = Math.min( scale, config.maxScale );
  1720. // Don't apply any scaling styles if scale is 1
  1721. if( scale === 1 ) {
  1722. dom.slides.style.zoom = '';
  1723. dom.slides.style.left = '';
  1724. dom.slides.style.top = '';
  1725. dom.slides.style.bottom = '';
  1726. dom.slides.style.right = '';
  1727. transformSlides( { layout: '' } );
  1728. }
  1729. else {
  1730. // Prefer zoom for scaling up so that content remains crisp.
  1731. // Don't use zoom to scale down since that can lead to shifts
  1732. // in text layout/line breaks.
  1733. if( scale > 1 && features.zoom ) {
  1734. dom.slides.style.zoom = scale;
  1735. dom.slides.style.left = '';
  1736. dom.slides.style.top = '';
  1737. dom.slides.style.bottom = '';
  1738. dom.slides.style.right = '';
  1739. transformSlides( { layout: '' } );
  1740. }
  1741. // Apply scale transform as a fallback
  1742. else {
  1743. dom.slides.style.zoom = '';
  1744. dom.slides.style.left = '50%';
  1745. dom.slides.style.top = '50%';
  1746. dom.slides.style.bottom = 'auto';
  1747. dom.slides.style.right = 'auto';
  1748. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1749. }
  1750. }
  1751. // Select all slides, vertical and horizontal
  1752. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1753. for( var i = 0, len = slides.length; i < len; i++ ) {
  1754. var slide = slides[ i ];
  1755. // Don't bother updating invisible slides
  1756. if( slide.style.display === 'none' ) {
  1757. continue;
  1758. }
  1759. if( config.center || slide.classList.contains( 'center' ) ) {
  1760. // Vertical stacks are not centred since their section
  1761. // children will be
  1762. if( slide.classList.contains( 'stack' ) ) {
  1763. slide.style.top = 0;
  1764. }
  1765. else {
  1766. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1767. }
  1768. }
  1769. else {
  1770. slide.style.top = '';
  1771. }
  1772. }
  1773. if( oldScale !== scale ) {
  1774. dispatchEvent( 'resize', {
  1775. 'oldScale': oldScale,
  1776. 'scale': scale,
  1777. 'size': size
  1778. } );
  1779. }
  1780. }
  1781. updateProgress();
  1782. updateParallax();
  1783. if( isOverview() ) {
  1784. updateOverview();
  1785. }
  1786. }
  1787. }
  1788. /**
  1789. * Applies layout logic to the contents of all slides in
  1790. * the presentation.
  1791. *
  1792. * @param {string|number} width
  1793. * @param {string|number} height
  1794. */
  1795. function layoutSlideContents( width, height ) {
  1796. // Handle sizing of elements with the 'stretch' class
  1797. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1798. // Determine how much vertical space we can use
  1799. var remainingHeight = getRemainingHeight( element, height );
  1800. // Consider the aspect ratio of media elements
  1801. if( /(img|video)/gi.test( element.nodeName ) ) {
  1802. var nw = element.naturalWidth || element.videoWidth,
  1803. nh = element.naturalHeight || element.videoHeight;
  1804. var es = Math.min( width / nw, remainingHeight / nh );
  1805. element.style.width = ( nw * es ) + 'px';
  1806. element.style.height = ( nh * es ) + 'px';
  1807. }
  1808. else {
  1809. element.style.width = width + 'px';
  1810. element.style.height = remainingHeight + 'px';
  1811. }
  1812. } );
  1813. }
  1814. /**
  1815. * Calculates the computed pixel size of our slides. These
  1816. * values are based on the width and height configuration
  1817. * options.
  1818. *
  1819. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1820. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1821. */
  1822. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1823. var size = {
  1824. // Slide size
  1825. width: config.width,
  1826. height: config.height,
  1827. // Presentation size
  1828. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1829. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1830. };
  1831. // Reduce available space by margin
  1832. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1833. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1834. // Slide width may be a percentage of available width
  1835. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1836. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1837. }
  1838. // Slide height may be a percentage of available height
  1839. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1840. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1841. }
  1842. return size;
  1843. }
  1844. /**
  1845. * Stores the vertical index of a stack so that the same
  1846. * vertical slide can be selected when navigating to and
  1847. * from the stack.
  1848. *
  1849. * @param {HTMLElement} stack The vertical stack element
  1850. * @param {string|number} [v=0] Index to memorize
  1851. */
  1852. function setPreviousVerticalIndex( stack, v ) {
  1853. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1854. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1855. }
  1856. }
  1857. /**
  1858. * Retrieves the vertical index which was stored using
  1859. * #setPreviousVerticalIndex() or 0 if no previous index
  1860. * exists.
  1861. *
  1862. * @param {HTMLElement} stack The vertical stack element
  1863. */
  1864. function getPreviousVerticalIndex( stack ) {
  1865. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1866. // Prefer manually defined start-indexv
  1867. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1868. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1869. }
  1870. return 0;
  1871. }
  1872. /**
  1873. * Displays the overview of slides (quick nav) by scaling
  1874. * down and arranging all slide elements.
  1875. */
  1876. function activateOverview() {
  1877. // Only proceed if enabled in config
  1878. if( config.overview && !isOverview() ) {
  1879. overview = true;
  1880. dom.wrapper.classList.add( 'overview' );
  1881. dom.wrapper.classList.remove( 'overview-deactivating' );
  1882. if( features.overviewTransitions ) {
  1883. setTimeout( function() {
  1884. dom.wrapper.classList.add( 'overview-animated' );
  1885. }, 1 );
  1886. }
  1887. // Don't auto-slide while in overview mode
  1888. cancelAutoSlide();
  1889. // Move the backgrounds element into the slide container to
  1890. // that the same scaling is applied
  1891. dom.slides.appendChild( dom.background );
  1892. // Clicking on an overview slide navigates to it
  1893. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1894. if( !slide.classList.contains( 'stack' ) ) {
  1895. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1896. }
  1897. } );
  1898. // Calculate slide sizes
  1899. var margin = 70;
  1900. var slideSize = getComputedSlideSize();
  1901. overviewSlideWidth = slideSize.width + margin;
  1902. overviewSlideHeight = slideSize.height + margin;
  1903. // Reverse in RTL mode
  1904. if( config.rtl ) {
  1905. overviewSlideWidth = -overviewSlideWidth;
  1906. }
  1907. updateSlidesVisibility();
  1908. layoutOverview();
  1909. updateOverview();
  1910. layout();
  1911. // Notify observers of the overview showing
  1912. dispatchEvent( 'overviewshown', {
  1913. 'indexh': indexh,
  1914. 'indexv': indexv,
  1915. 'currentSlide': currentSlide
  1916. } );
  1917. }
  1918. }
  1919. /**
  1920. * Uses CSS transforms to position all slides in a grid for
  1921. * display inside of the overview mode.
  1922. */
  1923. function layoutOverview() {
  1924. // Layout slides
  1925. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1926. hslide.setAttribute( 'data-index-h', h );
  1927. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1928. if( hslide.classList.contains( 'stack' ) ) {
  1929. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1930. vslide.setAttribute( 'data-index-h', h );
  1931. vslide.setAttribute( 'data-index-v', v );
  1932. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1933. } );
  1934. }
  1935. } );
  1936. // Layout slide backgrounds
  1937. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1938. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1939. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1940. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1941. } );
  1942. } );
  1943. }
  1944. /**
  1945. * Moves the overview viewport to the current slides.
  1946. * Called each time the current slide changes.
  1947. */
  1948. function updateOverview() {
  1949. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1950. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1951. transformSlides( {
  1952. overview: [
  1953. 'scale('+ scale +')',
  1954. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1955. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1956. ].join( ' ' )
  1957. } );
  1958. }
  1959. /**
  1960. * Exits the slide overview and enters the currently
  1961. * active slide.
  1962. */
  1963. function deactivateOverview() {
  1964. // Only proceed if enabled in config
  1965. if( config.overview ) {
  1966. overview = false;
  1967. dom.wrapper.classList.remove( 'overview' );
  1968. dom.wrapper.classList.remove( 'overview-animated' );
  1969. // Temporarily add a class so that transitions can do different things
  1970. // depending on whether they are exiting/entering overview, or just
  1971. // moving from slide to slide
  1972. dom.wrapper.classList.add( 'overview-deactivating' );
  1973. setTimeout( function () {
  1974. dom.wrapper.classList.remove( 'overview-deactivating' );
  1975. }, 1 );
  1976. // Move the background element back out
  1977. dom.wrapper.appendChild( dom.background );
  1978. // Clean up changes made to slides
  1979. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1980. transformElement( slide, '' );
  1981. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1982. } );
  1983. // Clean up changes made to backgrounds
  1984. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1985. transformElement( background, '' );
  1986. } );
  1987. transformSlides( { overview: '' } );
  1988. slide( indexh, indexv );
  1989. layout();
  1990. cueAutoSlide();
  1991. // Notify observers of the overview hiding
  1992. dispatchEvent( 'overviewhidden', {
  1993. 'indexh': indexh,
  1994. 'indexv': indexv,
  1995. 'currentSlide': currentSlide
  1996. } );
  1997. }
  1998. }
  1999. /**
  2000. * Toggles the slide overview mode on and off.
  2001. *
  2002. * @param {Boolean} [override] Flag which overrides the
  2003. * toggle logic and forcibly sets the desired state. True means
  2004. * overview is open, false means it's closed.
  2005. */
  2006. function toggleOverview( override ) {
  2007. if( typeof override === 'boolean' ) {
  2008. override ? activateOverview() : deactivateOverview();
  2009. }
  2010. else {
  2011. isOverview() ? deactivateOverview() : activateOverview();
  2012. }
  2013. }
  2014. /**
  2015. * Checks if the overview is currently active.
  2016. *
  2017. * @return {Boolean} true if the overview is active,
  2018. * false otherwise
  2019. */
  2020. function isOverview() {
  2021. return overview;
  2022. }
  2023. /**
  2024. * Return a hash URL that will resolve to the current slide location.
  2025. */
  2026. function locationHash() {
  2027. var url = '/';
  2028. // Attempt to create a named link based on the slide's ID
  2029. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  2030. if( id ) {
  2031. id = encodeURIComponent( id );
  2032. }
  2033. var indexf;
  2034. if( config.fragmentInURL ) {
  2035. indexf = getIndices().f;
  2036. }
  2037. // If the current slide has an ID, use that as a named link,
  2038. // but we don't support named links with a fragment index
  2039. if( typeof id === 'string' && id.length && indexf === undefined ) {
  2040. url = '/' + id;
  2041. }
  2042. // Otherwise use the /h/v index
  2043. else {
  2044. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2045. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  2046. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  2047. if( indexf !== undefined ) url += '/' + indexf;
  2048. }
  2049. return url;
  2050. }
  2051. /**
  2052. * Checks if the current or specified slide is vertical
  2053. * (nested within another slide).
  2054. *
  2055. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2056. * orientation of
  2057. * @return {Boolean}
  2058. */
  2059. function isVerticalSlide( slide ) {
  2060. // Prefer slide argument, otherwise use current slide
  2061. slide = slide ? slide : currentSlide;
  2062. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2063. }
  2064. /**
  2065. * Handling the fullscreen functionality via the fullscreen API
  2066. *
  2067. * @see http://fullscreen.spec.whatwg.org/
  2068. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2069. */
  2070. function enterFullscreen() {
  2071. var element = document.documentElement;
  2072. // Check which implementation is available
  2073. var requestMethod = element.requestFullscreen ||
  2074. element.webkitRequestFullscreen ||
  2075. element.webkitRequestFullScreen ||
  2076. element.mozRequestFullScreen ||
  2077. element.msRequestFullscreen;
  2078. if( requestMethod ) {
  2079. requestMethod.apply( element );
  2080. }
  2081. }
  2082. /**
  2083. * Shows the mouse pointer after it has been hidden with
  2084. * #hideCursor.
  2085. */
  2086. function showCursor() {
  2087. if( cursorHidden ) {
  2088. cursorHidden = false;
  2089. dom.wrapper.style.cursor = '';
  2090. }
  2091. }
  2092. /**
  2093. * Hides the mouse pointer when it's on top of the .reveal
  2094. * container.
  2095. */
  2096. function hideCursor() {
  2097. if( cursorHidden === false ) {
  2098. cursorHidden = true;
  2099. dom.wrapper.style.cursor = 'none';
  2100. }
  2101. }
  2102. /**
  2103. * Enters the paused mode which fades everything on screen to
  2104. * black.
  2105. */
  2106. function pause() {
  2107. if( config.pause ) {
  2108. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2109. cancelAutoSlide();
  2110. dom.wrapper.classList.add( 'paused' );
  2111. if( wasPaused === false ) {
  2112. dispatchEvent( 'paused' );
  2113. }
  2114. }
  2115. }
  2116. /**
  2117. * Exits from the paused mode.
  2118. */
  2119. function resume() {
  2120. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2121. dom.wrapper.classList.remove( 'paused' );
  2122. cueAutoSlide();
  2123. if( wasPaused ) {
  2124. dispatchEvent( 'resumed' );
  2125. }
  2126. }
  2127. /**
  2128. * Toggles the paused mode on and off.
  2129. */
  2130. function togglePause( override ) {
  2131. if( typeof override === 'boolean' ) {
  2132. override ? pause() : resume();
  2133. }
  2134. else {
  2135. isPaused() ? resume() : pause();
  2136. }
  2137. }
  2138. /**
  2139. * Checks if we are currently in the paused mode.
  2140. *
  2141. * @return {Boolean}
  2142. */
  2143. function isPaused() {
  2144. return dom.wrapper.classList.contains( 'paused' );
  2145. }
  2146. /**
  2147. * Toggles the auto slide mode on and off.
  2148. *
  2149. * @param {Boolean} [override] Flag which sets the desired state.
  2150. * True means autoplay starts, false means it stops.
  2151. */
  2152. function toggleAutoSlide( override ) {
  2153. if( typeof override === 'boolean' ) {
  2154. override ? resumeAutoSlide() : pauseAutoSlide();
  2155. }
  2156. else {
  2157. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2158. }
  2159. }
  2160. /**
  2161. * Checks if the auto slide mode is currently on.
  2162. *
  2163. * @return {Boolean}
  2164. */
  2165. function isAutoSliding() {
  2166. return !!( autoSlide && !autoSlidePaused );
  2167. }
  2168. /**
  2169. * Steps from the current point in the presentation to the
  2170. * slide which matches the specified horizontal and vertical
  2171. * indices.
  2172. *
  2173. * @param {number} [h=indexh] Horizontal index of the target slide
  2174. * @param {number} [v=indexv] Vertical index of the target slide
  2175. * @param {number} [f] Index of a fragment within the
  2176. * target slide to activate
  2177. * @param {number} [o] Origin for use in multimaster environments
  2178. */
  2179. function slide( h, v, f, o ) {
  2180. // Remember where we were at before
  2181. previousSlide = currentSlide;
  2182. // Query all horizontal slides in the deck
  2183. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2184. // Abort if there are no slides
  2185. if( horizontalSlides.length === 0 ) return;
  2186. // If no vertical index is specified and the upcoming slide is a
  2187. // stack, resume at its previous vertical index
  2188. if( v === undefined && !isOverview() ) {
  2189. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2190. }
  2191. // If we were on a vertical stack, remember what vertical index
  2192. // it was on so we can resume at the same position when returning
  2193. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2194. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2195. }
  2196. // Remember the state before this slide
  2197. var stateBefore = state.concat();
  2198. // Reset the state array
  2199. state.length = 0;
  2200. var indexhBefore = indexh || 0,
  2201. indexvBefore = indexv || 0;
  2202. // Activate and transition to the new slide
  2203. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2204. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2205. // Update the visibility of slides now that the indices have changed
  2206. updateSlidesVisibility();
  2207. layout();
  2208. // Update the overview if it's currently active
  2209. if( isOverview() ) {
  2210. updateOverview();
  2211. }
  2212. // Find the current horizontal slide and any possible vertical slides
  2213. // within it
  2214. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2215. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2216. // Store references to the previous and current slides
  2217. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2218. // Show fragment, if specified
  2219. if( typeof f !== 'undefined' ) {
  2220. navigateFragment( f );
  2221. }
  2222. // Dispatch an event if the slide changed
  2223. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2224. if (!slideChanged) {
  2225. // Ensure that the previous slide is never the same as the current
  2226. previousSlide = null;
  2227. }
  2228. // Solves an edge case where the previous slide maintains the
  2229. // 'present' class when navigating between adjacent vertical
  2230. // stacks
  2231. if( previousSlide && previousSlide !== currentSlide ) {
  2232. previousSlide.classList.remove( 'present' );
  2233. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2234. // Reset all slides upon navigate to home
  2235. // Issue: #285
  2236. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2237. // Launch async task
  2238. setTimeout( function () {
  2239. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2240. for( i in slides ) {
  2241. if( slides[i] ) {
  2242. // Reset stack
  2243. setPreviousVerticalIndex( slides[i], 0 );
  2244. }
  2245. }
  2246. }, 0 );
  2247. }
  2248. }
  2249. // Apply the new state
  2250. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2251. // Check if this state existed on the previous slide. If it
  2252. // did, we will avoid adding it repeatedly
  2253. for( var j = 0; j < stateBefore.length; j++ ) {
  2254. if( stateBefore[j] === state[i] ) {
  2255. stateBefore.splice( j, 1 );
  2256. continue stateLoop;
  2257. }
  2258. }
  2259. document.documentElement.classList.add( state[i] );
  2260. // Dispatch custom event matching the state's name
  2261. dispatchEvent( state[i] );
  2262. }
  2263. // Clean up the remains of the previous state
  2264. while( stateBefore.length ) {
  2265. document.documentElement.classList.remove( stateBefore.pop() );
  2266. }
  2267. if( slideChanged ) {
  2268. dispatchEvent( 'slidechanged', {
  2269. 'indexh': indexh,
  2270. 'indexv': indexv,
  2271. 'previousSlide': previousSlide,
  2272. 'currentSlide': currentSlide,
  2273. 'origin': o
  2274. } );
  2275. }
  2276. // Handle embedded content
  2277. if( slideChanged || !previousSlide ) {
  2278. stopEmbeddedContent( previousSlide );
  2279. startEmbeddedContent( currentSlide );
  2280. }
  2281. // Announce the current slide contents, for screen readers
  2282. dom.statusDiv.textContent = getStatusText( currentSlide );
  2283. updateControls();
  2284. updateProgress();
  2285. updateBackground();
  2286. updateParallax();
  2287. updateSlideNumber();
  2288. updateNotes();
  2289. updateFragments();
  2290. // Update the URL hash
  2291. writeURL();
  2292. cueAutoSlide();
  2293. }
  2294. /**
  2295. * Syncs the presentation with the current DOM. Useful
  2296. * when new slides or control elements are added or when
  2297. * the configuration has changed.
  2298. */
  2299. function sync() {
  2300. // Subscribe to input
  2301. removeEventListeners();
  2302. addEventListeners();
  2303. // Force a layout to make sure the current config is accounted for
  2304. layout();
  2305. // Reflect the current autoSlide value
  2306. autoSlide = config.autoSlide;
  2307. // Start auto-sliding if it's enabled
  2308. cueAutoSlide();
  2309. // Re-create the slide backgrounds
  2310. createBackgrounds();
  2311. // Write the current hash to the URL
  2312. writeURL();
  2313. sortAllFragments();
  2314. updateControls();
  2315. updateProgress();
  2316. updateSlideNumber();
  2317. updateSlidesVisibility();
  2318. updateBackground( true );
  2319. updateNotesVisibility();
  2320. updateNotes();
  2321. formatEmbeddedContent();
  2322. // Start or stop embedded content depending on global config
  2323. if( config.autoPlayMedia === false ) {
  2324. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2325. }
  2326. else {
  2327. startEmbeddedContent( currentSlide );
  2328. }
  2329. if( isOverview() ) {
  2330. layoutOverview();
  2331. }
  2332. }
  2333. /**
  2334. * Updates reveal.js to keep in sync with new slide attributes. For
  2335. * example, if you add a new `data-background-image` you can call
  2336. * this to have reveal.js render the new background image.
  2337. *
  2338. * Similar to #sync() but more efficient when you only need to
  2339. * refresh a specific slide.
  2340. *
  2341. * @param {HTMLElement} slide
  2342. */
  2343. function syncSlide( slide ) {
  2344. // Default to the current slide
  2345. slide = slide || currentSlide;
  2346. syncBackground( slide );
  2347. syncFragments( slide );
  2348. updateBackground();
  2349. updateNotes();
  2350. loadSlide( slide );
  2351. }
  2352. /**
  2353. * Formats the fragments on the given slide so that they have
  2354. * valid indices. Call this if fragments are changed in the DOM
  2355. * after reveal.js has already initialized.
  2356. *
  2357. * @param {HTMLElement} slide
  2358. * @return {Array} a list of the HTML fragments that were synced
  2359. */
  2360. function syncFragments( slide ) {
  2361. // Default to the current slide
  2362. slide = slide || currentSlide;
  2363. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2364. }
  2365. /**
  2366. * Resets all vertical slides so that only the first
  2367. * is visible.
  2368. */
  2369. function resetVerticalSlides() {
  2370. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2371. horizontalSlides.forEach( function( horizontalSlide ) {
  2372. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2373. verticalSlides.forEach( function( verticalSlide, y ) {
  2374. if( y > 0 ) {
  2375. verticalSlide.classList.remove( 'present' );
  2376. verticalSlide.classList.remove( 'past' );
  2377. verticalSlide.classList.add( 'future' );
  2378. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2379. }
  2380. } );
  2381. } );
  2382. }
  2383. /**
  2384. * Sorts and formats all of fragments in the
  2385. * presentation.
  2386. */
  2387. function sortAllFragments() {
  2388. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2389. horizontalSlides.forEach( function( horizontalSlide ) {
  2390. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2391. verticalSlides.forEach( function( verticalSlide, y ) {
  2392. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2393. } );
  2394. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2395. } );
  2396. }
  2397. /**
  2398. * Randomly shuffles all slides in the deck.
  2399. */
  2400. function shuffle() {
  2401. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2402. slides.forEach( function( slide ) {
  2403. // Insert this slide next to another random slide. This may
  2404. // cause the slide to insert before itself but that's fine.
  2405. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2406. } );
  2407. }
  2408. /**
  2409. * Updates one dimension of slides by showing the slide
  2410. * with the specified index.
  2411. *
  2412. * @param {string} selector A CSS selector that will fetch
  2413. * the group of slides we are working with
  2414. * @param {number} index The index of the slide that should be
  2415. * shown
  2416. *
  2417. * @return {number} The index of the slide that is now shown,
  2418. * might differ from the passed in index if it was out of
  2419. * bounds.
  2420. */
  2421. function updateSlides( selector, index ) {
  2422. // Select all slides and convert the NodeList result to
  2423. // an array
  2424. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2425. slidesLength = slides.length;
  2426. var printMode = isPrintingPDF();
  2427. if( slidesLength ) {
  2428. // Should the index loop?
  2429. if( config.loop ) {
  2430. index %= slidesLength;
  2431. if( index < 0 ) {
  2432. index = slidesLength + index;
  2433. }
  2434. }
  2435. // Enforce max and minimum index bounds
  2436. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2437. for( var i = 0; i < slidesLength; i++ ) {
  2438. var element = slides[i];
  2439. var reverse = config.rtl && !isVerticalSlide( element );
  2440. element.classList.remove( 'past' );
  2441. element.classList.remove( 'present' );
  2442. element.classList.remove( 'future' );
  2443. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2444. element.setAttribute( 'hidden', '' );
  2445. element.setAttribute( 'aria-hidden', 'true' );
  2446. // If this element contains vertical slides
  2447. if( element.querySelector( 'section' ) ) {
  2448. element.classList.add( 'stack' );
  2449. }
  2450. // If we're printing static slides, all slides are "present"
  2451. if( printMode ) {
  2452. element.classList.add( 'present' );
  2453. continue;
  2454. }
  2455. if( i < index ) {
  2456. // Any element previous to index is given the 'past' class
  2457. element.classList.add( reverse ? 'future' : 'past' );
  2458. if( config.fragments ) {
  2459. // Show all fragments in prior slides
  2460. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2461. fragment.classList.add( 'visible' );
  2462. fragment.classList.remove( 'current-fragment' );
  2463. } );
  2464. }
  2465. }
  2466. else if( i > index ) {
  2467. // Any element subsequent to index is given the 'future' class
  2468. element.classList.add( reverse ? 'past' : 'future' );
  2469. if( config.fragments ) {
  2470. // Hide all fragments in future slides
  2471. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2472. fragment.classList.remove( 'visible' );
  2473. fragment.classList.remove( 'current-fragment' );
  2474. } );
  2475. }
  2476. }
  2477. }
  2478. // Mark the current slide as present
  2479. slides[index].classList.add( 'present' );
  2480. slides[index].removeAttribute( 'hidden' );
  2481. slides[index].removeAttribute( 'aria-hidden' );
  2482. // If this slide has a state associated with it, add it
  2483. // onto the current state of the deck
  2484. var slideState = slides[index].getAttribute( 'data-state' );
  2485. if( slideState ) {
  2486. state = state.concat( slideState.split( ' ' ) );
  2487. }
  2488. }
  2489. else {
  2490. // Since there are no slides we can't be anywhere beyond the
  2491. // zeroth index
  2492. index = 0;
  2493. }
  2494. return index;
  2495. }
  2496. /**
  2497. * Optimization method; hide all slides that are far away
  2498. * from the present slide.
  2499. */
  2500. function updateSlidesVisibility() {
  2501. // Select all slides and convert the NodeList result to
  2502. // an array
  2503. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2504. horizontalSlidesLength = horizontalSlides.length,
  2505. distanceX,
  2506. distanceY;
  2507. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2508. // The number of steps away from the present slide that will
  2509. // be visible
  2510. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2511. // Limit view distance on weaker devices
  2512. if( isMobileDevice ) {
  2513. viewDistance = isOverview() ? 6 : 2;
  2514. }
  2515. // All slides need to be visible when exporting to PDF
  2516. if( isPrintingPDF() ) {
  2517. viewDistance = Number.MAX_VALUE;
  2518. }
  2519. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2520. var horizontalSlide = horizontalSlides[x];
  2521. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2522. verticalSlidesLength = verticalSlides.length;
  2523. // Determine how far away this slide is from the present
  2524. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2525. // If the presentation is looped, distance should measure
  2526. // 1 between the first and last slides
  2527. if( config.loop ) {
  2528. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2529. }
  2530. // Show the horizontal slide if it's within the view distance
  2531. if( distanceX < viewDistance ) {
  2532. loadSlide( horizontalSlide );
  2533. }
  2534. else {
  2535. unloadSlide( horizontalSlide );
  2536. }
  2537. if( verticalSlidesLength ) {
  2538. var oy = getPreviousVerticalIndex( horizontalSlide );
  2539. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2540. var verticalSlide = verticalSlides[y];
  2541. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2542. if( distanceX + distanceY < viewDistance ) {
  2543. loadSlide( verticalSlide );
  2544. }
  2545. else {
  2546. unloadSlide( verticalSlide );
  2547. }
  2548. }
  2549. }
  2550. }
  2551. // Flag if there are ANY vertical slides, anywhere in the deck
  2552. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2553. dom.wrapper.classList.add( 'has-vertical-slides' );
  2554. }
  2555. else {
  2556. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2557. }
  2558. // Flag if there are ANY horizontal slides, anywhere in the deck
  2559. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2560. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2561. }
  2562. else {
  2563. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2564. }
  2565. }
  2566. }
  2567. /**
  2568. * Pick up notes from the current slide and display them
  2569. * to the viewer.
  2570. *
  2571. * @see {@link config.showNotes}
  2572. */
  2573. function updateNotes() {
  2574. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2575. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2576. }
  2577. }
  2578. /**
  2579. * Updates the visibility of the speaker notes sidebar that
  2580. * is used to share annotated slides. The notes sidebar is
  2581. * only visible if showNotes is true and there are notes on
  2582. * one or more slides in the deck.
  2583. */
  2584. function updateNotesVisibility() {
  2585. if( config.showNotes && hasNotes() ) {
  2586. dom.wrapper.classList.add( 'show-notes' );
  2587. }
  2588. else {
  2589. dom.wrapper.classList.remove( 'show-notes' );
  2590. }
  2591. }
  2592. /**
  2593. * Checks if there are speaker notes for ANY slide in the
  2594. * presentation.
  2595. */
  2596. function hasNotes() {
  2597. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2598. }
  2599. /**
  2600. * Updates the progress bar to reflect the current slide.
  2601. */
  2602. function updateProgress() {
  2603. // Update progress if enabled
  2604. if( config.progress && dom.progressbar ) {
  2605. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2606. }
  2607. }
  2608. /**
  2609. * Updates the slide number to match the current slide.
  2610. */
  2611. function updateSlideNumber() {
  2612. // Update slide number if enabled
  2613. if( config.slideNumber && dom.slideNumber ) {
  2614. var value;
  2615. var format = 'h.v';
  2616. if( typeof config.slideNumber === 'function' ) {
  2617. value = config.slideNumber();
  2618. }
  2619. else {
  2620. // Check if a custom number format is available
  2621. if( typeof config.slideNumber === 'string' ) {
  2622. format = config.slideNumber;
  2623. }
  2624. // If there are ONLY vertical slides in this deck, always use
  2625. // a flattened slide number
  2626. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2627. format = 'c';
  2628. }
  2629. value = [];
  2630. switch( format ) {
  2631. case 'c':
  2632. value.push( getSlidePastCount() + 1 );
  2633. break;
  2634. case 'c/t':
  2635. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2636. break;
  2637. case 'h/v':
  2638. value.push( indexh + 1 );
  2639. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2640. break;
  2641. default:
  2642. value.push( indexh + 1 );
  2643. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2644. }
  2645. }
  2646. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2647. }
  2648. }
  2649. /**
  2650. * Applies HTML formatting to a slide number before it's
  2651. * written to the DOM.
  2652. *
  2653. * @param {number} a Current slide
  2654. * @param {string} delimiter Character to separate slide numbers
  2655. * @param {(number|*)} b Total slides
  2656. * @return {string} HTML string fragment
  2657. */
  2658. function formatSlideNumber( a, delimiter, b ) {
  2659. var url = '#' + locationHash();
  2660. if( typeof b === 'number' && !isNaN( b ) ) {
  2661. return '<a href="' + url + '">' +
  2662. '<span class="slide-number-a">'+ a +'</span>' +
  2663. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2664. '<span class="slide-number-b">'+ b +'</span>' +
  2665. '</a>';
  2666. }
  2667. else {
  2668. return '<a href="' + url + '">' +
  2669. '<span class="slide-number-a">'+ a +'</span>' +
  2670. '</a>';
  2671. }
  2672. }
  2673. /**
  2674. * Updates the state of all control/navigation arrows.
  2675. */
  2676. function updateControls() {
  2677. var routes = availableRoutes();
  2678. var fragments = availableFragments();
  2679. // Remove the 'enabled' class from all directions
  2680. dom.controlsLeft.concat( dom.controlsRight )
  2681. .concat( dom.controlsUp )
  2682. .concat( dom.controlsDown )
  2683. .concat( dom.controlsPrev )
  2684. .concat( dom.controlsNext ).forEach( function( node ) {
  2685. node.classList.remove( 'enabled' );
  2686. node.classList.remove( 'fragmented' );
  2687. // Set 'disabled' attribute on all directions
  2688. node.setAttribute( 'disabled', 'disabled' );
  2689. } );
  2690. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2691. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2692. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2693. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2694. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2695. // Prev/next buttons
  2696. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2697. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2698. // Highlight fragment directions
  2699. if( currentSlide ) {
  2700. // Always apply fragment decorator to prev/next buttons
  2701. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2702. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2703. // Apply fragment decorators to directional buttons based on
  2704. // what slide axis they are in
  2705. if( isVerticalSlide( currentSlide ) ) {
  2706. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2707. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2708. }
  2709. else {
  2710. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2711. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2712. }
  2713. }
  2714. if( config.controlsTutorial ) {
  2715. // Highlight control arrows with an animation to ensure
  2716. // that the viewer knows how to navigate
  2717. if( !hasNavigatedDown && routes.down ) {
  2718. dom.controlsDownArrow.classList.add( 'highlight' );
  2719. }
  2720. else {
  2721. dom.controlsDownArrow.classList.remove( 'highlight' );
  2722. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2723. dom.controlsRightArrow.classList.add( 'highlight' );
  2724. }
  2725. else {
  2726. dom.controlsRightArrow.classList.remove( 'highlight' );
  2727. }
  2728. }
  2729. }
  2730. }
  2731. /**
  2732. * Updates the background elements to reflect the current
  2733. * slide.
  2734. *
  2735. * @param {boolean} includeAll If true, the backgrounds of
  2736. * all vertical slides (not just the present) will be updated.
  2737. */
  2738. function updateBackground( includeAll ) {
  2739. var currentBackground = null;
  2740. // Reverse past/future classes when in RTL mode
  2741. var horizontalPast = config.rtl ? 'future' : 'past',
  2742. horizontalFuture = config.rtl ? 'past' : 'future';
  2743. // Update the classes of all backgrounds to match the
  2744. // states of their slides (past/present/future)
  2745. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2746. backgroundh.classList.remove( 'past' );
  2747. backgroundh.classList.remove( 'present' );
  2748. backgroundh.classList.remove( 'future' );
  2749. if( h < indexh ) {
  2750. backgroundh.classList.add( horizontalPast );
  2751. }
  2752. else if ( h > indexh ) {
  2753. backgroundh.classList.add( horizontalFuture );
  2754. }
  2755. else {
  2756. backgroundh.classList.add( 'present' );
  2757. // Store a reference to the current background element
  2758. currentBackground = backgroundh;
  2759. }
  2760. if( includeAll || h === indexh ) {
  2761. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2762. backgroundv.classList.remove( 'past' );
  2763. backgroundv.classList.remove( 'present' );
  2764. backgroundv.classList.remove( 'future' );
  2765. if( v < indexv ) {
  2766. backgroundv.classList.add( 'past' );
  2767. }
  2768. else if ( v > indexv ) {
  2769. backgroundv.classList.add( 'future' );
  2770. }
  2771. else {
  2772. backgroundv.classList.add( 'present' );
  2773. // Only if this is the present horizontal and vertical slide
  2774. if( h === indexh ) currentBackground = backgroundv;
  2775. }
  2776. } );
  2777. }
  2778. } );
  2779. // Stop content inside of previous backgrounds
  2780. if( previousBackground ) {
  2781. stopEmbeddedContent( previousBackground );
  2782. }
  2783. // Start content in the current background
  2784. if( currentBackground ) {
  2785. startEmbeddedContent( currentBackground );
  2786. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2787. if( currentBackgroundContent ) {
  2788. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2789. // Restart GIFs (doesn't work in Firefox)
  2790. if( /\.gif/i.test( backgroundImageURL ) ) {
  2791. currentBackgroundContent.style.backgroundImage = '';
  2792. window.getComputedStyle( currentBackgroundContent ).opacity;
  2793. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2794. }
  2795. }
  2796. // Don't transition between identical backgrounds. This
  2797. // prevents unwanted flicker.
  2798. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2799. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2800. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2801. dom.background.classList.add( 'no-transition' );
  2802. }
  2803. previousBackground = currentBackground;
  2804. }
  2805. // If there's a background brightness flag for this slide,
  2806. // bubble it to the .reveal container
  2807. if( currentSlide ) {
  2808. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2809. if( currentSlide.classList.contains( classToBubble ) ) {
  2810. dom.wrapper.classList.add( classToBubble );
  2811. }
  2812. else {
  2813. dom.wrapper.classList.remove( classToBubble );
  2814. }
  2815. } );
  2816. }
  2817. // Allow the first background to apply without transition
  2818. setTimeout( function() {
  2819. dom.background.classList.remove( 'no-transition' );
  2820. }, 1 );
  2821. }
  2822. /**
  2823. * Updates the position of the parallax background based
  2824. * on the current slide index.
  2825. */
  2826. function updateParallax() {
  2827. if( config.parallaxBackgroundImage ) {
  2828. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2829. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2830. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2831. backgroundWidth, backgroundHeight;
  2832. if( backgroundSize.length === 1 ) {
  2833. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2834. }
  2835. else {
  2836. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2837. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2838. }
  2839. var slideWidth = dom.background.offsetWidth,
  2840. horizontalSlideCount = horizontalSlides.length,
  2841. horizontalOffsetMultiplier,
  2842. horizontalOffset;
  2843. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2844. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2845. }
  2846. else {
  2847. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2848. }
  2849. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2850. var slideHeight = dom.background.offsetHeight,
  2851. verticalSlideCount = verticalSlides.length,
  2852. verticalOffsetMultiplier,
  2853. verticalOffset;
  2854. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2855. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2856. }
  2857. else {
  2858. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2859. }
  2860. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2861. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2862. }
  2863. }
  2864. /**
  2865. * Should the given element be preloaded?
  2866. * Decides based on local element attributes and global config.
  2867. *
  2868. * @param {HTMLElement} element
  2869. */
  2870. function shouldPreload( element ) {
  2871. // Prefer an explicit global preload setting
  2872. var preload = config.preloadIframes;
  2873. // If no global setting is available, fall back on the element's
  2874. // own preload setting
  2875. if( typeof preload !== 'boolean' ) {
  2876. preload = element.hasAttribute( 'data-preload' );
  2877. }
  2878. return preload;
  2879. }
  2880. /**
  2881. * Called when the given slide is within the configured view
  2882. * distance. Shows the slide element and loads any content
  2883. * that is set to load lazily (data-src).
  2884. *
  2885. * @param {HTMLElement} slide Slide to show
  2886. */
  2887. function loadSlide( slide, options ) {
  2888. options = options || {};
  2889. // Show the slide element
  2890. slide.style.display = config.display;
  2891. // Media elements with data-src attributes
  2892. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2893. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2894. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2895. element.setAttribute( 'data-lazy-loaded', '' );
  2896. element.removeAttribute( 'data-src' );
  2897. }
  2898. } );
  2899. // Media elements with <source> children
  2900. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2901. var sources = 0;
  2902. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2903. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2904. source.removeAttribute( 'data-src' );
  2905. source.setAttribute( 'data-lazy-loaded', '' );
  2906. sources += 1;
  2907. } );
  2908. // If we rewrote sources for this video/audio element, we need
  2909. // to manually tell it to load from its new origin
  2910. if( sources > 0 ) {
  2911. media.load();
  2912. }
  2913. } );
  2914. // Show the corresponding background element
  2915. var background = slide.slideBackgroundElement;
  2916. if( background ) {
  2917. background.style.display = 'block';
  2918. var backgroundContent = slide.slideBackgroundContentElement;
  2919. // If the background contains media, load it
  2920. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2921. background.setAttribute( 'data-loaded', 'true' );
  2922. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2923. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2924. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2925. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2926. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2927. // Images
  2928. if( backgroundImage ) {
  2929. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2930. }
  2931. // Videos
  2932. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2933. var video = document.createElement( 'video' );
  2934. if( backgroundVideoLoop ) {
  2935. video.setAttribute( 'loop', '' );
  2936. }
  2937. if( backgroundVideoMuted ) {
  2938. video.muted = true;
  2939. }
  2940. // Inline video playback works (at least in Mobile Safari) as
  2941. // long as the video is muted and the `playsinline` attribute is
  2942. // present
  2943. if( isMobileDevice ) {
  2944. video.muted = true;
  2945. video.autoplay = true;
  2946. video.setAttribute( 'playsinline', '' );
  2947. }
  2948. // Support comma separated lists of video sources
  2949. backgroundVideo.split( ',' ).forEach( function( source ) {
  2950. video.innerHTML += '<source src="'+ source +'">';
  2951. } );
  2952. backgroundContent.appendChild( video );
  2953. }
  2954. // Iframes
  2955. else if( backgroundIframe && options.excludeIframes !== true ) {
  2956. var iframe = document.createElement( 'iframe' );
  2957. iframe.setAttribute( 'allowfullscreen', '' );
  2958. iframe.setAttribute( 'mozallowfullscreen', '' );
  2959. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2960. // Only load autoplaying content when the slide is shown to
  2961. // avoid having it play in the background
  2962. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2963. iframe.setAttribute( 'data-src', backgroundIframe );
  2964. }
  2965. else {
  2966. iframe.setAttribute( 'src', backgroundIframe );
  2967. }
  2968. iframe.style.width = '100%';
  2969. iframe.style.height = '100%';
  2970. iframe.style.maxHeight = '100%';
  2971. iframe.style.maxWidth = '100%';
  2972. backgroundContent.appendChild( iframe );
  2973. }
  2974. }
  2975. }
  2976. }
  2977. /**
  2978. * Unloads and hides the given slide. This is called when the
  2979. * slide is moved outside of the configured view distance.
  2980. *
  2981. * @param {HTMLElement} slide
  2982. */
  2983. function unloadSlide( slide ) {
  2984. // Hide the slide element
  2985. slide.style.display = 'none';
  2986. // Hide the corresponding background element
  2987. var background = getSlideBackground( slide );
  2988. if( background ) {
  2989. background.style.display = 'none';
  2990. }
  2991. // Reset lazy-loaded media elements with src attributes
  2992. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  2993. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  2994. element.removeAttribute( 'src' );
  2995. } );
  2996. // Reset lazy-loaded media elements with <source> children
  2997. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  2998. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  2999. source.removeAttribute( 'src' );
  3000. } );
  3001. }
  3002. /**
  3003. * Determine what available routes there are for navigation.
  3004. *
  3005. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3006. */
  3007. function availableRoutes() {
  3008. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3009. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3010. var routes = {
  3011. left: indexh > 0,
  3012. right: indexh < horizontalSlides.length - 1,
  3013. up: indexv > 0,
  3014. down: indexv < verticalSlides.length - 1
  3015. };
  3016. // Looped presentations can always be navigated as long as
  3017. // there are slides available
  3018. if( config.loop ) {
  3019. if( horizontalSlides.length > 1 ) {
  3020. routes.left = true;
  3021. routes.right = true;
  3022. }
  3023. if( verticalSlides.length > 1 ) {
  3024. routes.up = true;
  3025. routes.down = true;
  3026. }
  3027. }
  3028. // Reverse horizontal controls for rtl
  3029. if( config.rtl ) {
  3030. var left = routes.left;
  3031. routes.left = routes.right;
  3032. routes.right = left;
  3033. }
  3034. return routes;
  3035. }
  3036. /**
  3037. * Returns an object describing the available fragment
  3038. * directions.
  3039. *
  3040. * @return {{prev: boolean, next: boolean}}
  3041. */
  3042. function availableFragments() {
  3043. if( currentSlide && config.fragments ) {
  3044. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3045. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3046. return {
  3047. prev: fragments.length - hiddenFragments.length > 0,
  3048. next: !!hiddenFragments.length
  3049. };
  3050. }
  3051. else {
  3052. return { prev: false, next: false };
  3053. }
  3054. }
  3055. /**
  3056. * Enforces origin-specific format rules for embedded media.
  3057. */
  3058. function formatEmbeddedContent() {
  3059. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3060. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3061. var src = el.getAttribute( sourceAttribute );
  3062. if( src && src.indexOf( param ) === -1 ) {
  3063. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3064. }
  3065. });
  3066. };
  3067. // YouTube frames must include "?enablejsapi=1"
  3068. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3069. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3070. // Vimeo frames must include "?api=1"
  3071. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3072. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3073. }
  3074. /**
  3075. * Start playback of any embedded content inside of
  3076. * the given element.
  3077. *
  3078. * @param {HTMLElement} element
  3079. */
  3080. function startEmbeddedContent( element ) {
  3081. if( element && !isSpeakerNotes() ) {
  3082. // Restart GIFs
  3083. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3084. // Setting the same unchanged source like this was confirmed
  3085. // to work in Chrome, FF & Safari
  3086. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3087. } );
  3088. // HTML5 media elements
  3089. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3090. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3091. return;
  3092. }
  3093. // Prefer an explicit global autoplay setting
  3094. var autoplay = config.autoPlayMedia;
  3095. // If no global setting is available, fall back on the element's
  3096. // own autoplay setting
  3097. if( typeof autoplay !== 'boolean' ) {
  3098. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3099. }
  3100. if( autoplay && typeof el.play === 'function' ) {
  3101. // If the media is ready, start playback
  3102. if( el.readyState > 1 ) {
  3103. startEmbeddedMedia( { target: el } );
  3104. }
  3105. // Mobile devices never fire a loaded event so instead
  3106. // of waiting, we initiate playback
  3107. else if( isMobileDevice ) {
  3108. var promise = el.play();
  3109. // If autoplay does not work, ensure that the controls are visible so
  3110. // that the viewer can start the media on their own
  3111. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3112. promise.catch( function() {
  3113. el.controls = true;
  3114. // Once the video does start playing, hide the controls again
  3115. el.addEventListener( 'play', function() {
  3116. el.controls = false;
  3117. } );
  3118. } );
  3119. }
  3120. }
  3121. // If the media isn't loaded, wait before playing
  3122. else {
  3123. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3124. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3125. }
  3126. }
  3127. } );
  3128. // Normal iframes
  3129. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3130. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3131. return;
  3132. }
  3133. startEmbeddedIframe( { target: el } );
  3134. } );
  3135. // Lazy loading iframes
  3136. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3137. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3138. return;
  3139. }
  3140. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3141. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3142. el.addEventListener( 'load', startEmbeddedIframe );
  3143. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3144. }
  3145. } );
  3146. }
  3147. }
  3148. /**
  3149. * Starts playing an embedded video/audio element after
  3150. * it has finished loading.
  3151. *
  3152. * @param {object} event
  3153. */
  3154. function startEmbeddedMedia( event ) {
  3155. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3156. isVisible = !!closestParent( event.target, '.present' );
  3157. if( isAttachedToDOM && isVisible ) {
  3158. event.target.currentTime = 0;
  3159. event.target.play();
  3160. }
  3161. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3162. }
  3163. /**
  3164. * "Starts" the content of an embedded iframe using the
  3165. * postMessage API.
  3166. *
  3167. * @param {object} event
  3168. */
  3169. function startEmbeddedIframe( event ) {
  3170. var iframe = event.target;
  3171. if( iframe && iframe.contentWindow ) {
  3172. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3173. isVisible = !!closestParent( event.target, '.present' );
  3174. if( isAttachedToDOM && isVisible ) {
  3175. // Prefer an explicit global autoplay setting
  3176. var autoplay = config.autoPlayMedia;
  3177. // If no global setting is available, fall back on the element's
  3178. // own autoplay setting
  3179. if( typeof autoplay !== 'boolean' ) {
  3180. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3181. }
  3182. // YouTube postMessage API
  3183. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3184. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3185. }
  3186. // Vimeo postMessage API
  3187. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3188. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3189. }
  3190. // Generic postMessage API
  3191. else {
  3192. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3193. }
  3194. }
  3195. }
  3196. }
  3197. /**
  3198. * Stop playback of any embedded content inside of
  3199. * the targeted slide.
  3200. *
  3201. * @param {HTMLElement} element
  3202. */
  3203. function stopEmbeddedContent( element, options ) {
  3204. options = extend( {
  3205. // Defaults
  3206. unloadIframes: true
  3207. }, options || {} );
  3208. if( element && element.parentNode ) {
  3209. // HTML5 media elements
  3210. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3211. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3212. el.setAttribute('data-paused-by-reveal', '');
  3213. el.pause();
  3214. }
  3215. } );
  3216. // Generic postMessage API for non-lazy loaded iframes
  3217. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3218. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3219. el.removeEventListener( 'load', startEmbeddedIframe );
  3220. });
  3221. // YouTube postMessage API
  3222. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3223. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3224. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3225. }
  3226. });
  3227. // Vimeo postMessage API
  3228. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3229. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3230. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3231. }
  3232. });
  3233. if( options.unloadIframes === true ) {
  3234. // Unload lazy-loaded iframes
  3235. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3236. // Only removing the src doesn't actually unload the frame
  3237. // in all browsers (Firefox) so we set it to blank first
  3238. el.setAttribute( 'src', 'about:blank' );
  3239. el.removeAttribute( 'src' );
  3240. } );
  3241. }
  3242. }
  3243. }
  3244. /**
  3245. * Returns the number of past slides. This can be used as a global
  3246. * flattened index for slides.
  3247. *
  3248. * @return {number} Past slide count
  3249. */
  3250. function getSlidePastCount() {
  3251. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3252. // The number of past slides
  3253. var pastCount = 0;
  3254. // Step through all slides and count the past ones
  3255. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3256. var horizontalSlide = horizontalSlides[i];
  3257. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3258. for( var j = 0; j < verticalSlides.length; j++ ) {
  3259. // Stop as soon as we arrive at the present
  3260. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3261. break mainLoop;
  3262. }
  3263. pastCount++;
  3264. }
  3265. // Stop as soon as we arrive at the present
  3266. if( horizontalSlide.classList.contains( 'present' ) ) {
  3267. break;
  3268. }
  3269. // Don't count the wrapping section for vertical slides
  3270. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3271. pastCount++;
  3272. }
  3273. }
  3274. return pastCount;
  3275. }
  3276. /**
  3277. * Returns a value ranging from 0-1 that represents
  3278. * how far into the presentation we have navigated.
  3279. *
  3280. * @return {number}
  3281. */
  3282. function getProgress() {
  3283. // The number of past and total slides
  3284. var totalCount = getTotalSlides();
  3285. var pastCount = getSlidePastCount();
  3286. if( currentSlide ) {
  3287. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3288. // If there are fragments in the current slide those should be
  3289. // accounted for in the progress.
  3290. if( allFragments.length > 0 ) {
  3291. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3292. // This value represents how big a portion of the slide progress
  3293. // that is made up by its fragments (0-1)
  3294. var fragmentWeight = 0.9;
  3295. // Add fragment progress to the past slide count
  3296. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3297. }
  3298. }
  3299. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3300. }
  3301. /**
  3302. * Checks if this presentation is running inside of the
  3303. * speaker notes window.
  3304. *
  3305. * @return {boolean}
  3306. */
  3307. function isSpeakerNotes() {
  3308. return !!window.location.search.match( /receiver/gi );
  3309. }
  3310. /**
  3311. * Reads the current URL (hash) and navigates accordingly.
  3312. */
  3313. function readURL() {
  3314. var hash = window.location.hash;
  3315. // Attempt to parse the hash as either an index or name
  3316. var bits = hash.slice( 2 ).split( '/' ),
  3317. name = hash.replace( /#|\//gi, '' );
  3318. // If the first bit is not fully numeric and there is a name we
  3319. // can assume that this is a named link
  3320. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3321. var element;
  3322. // Ensure the named link is a valid HTML ID attribute
  3323. try {
  3324. element = document.getElementById( decodeURIComponent( name ) );
  3325. }
  3326. catch ( error ) { }
  3327. // Ensure that we're not already on a slide with the same name
  3328. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3329. if( element ) {
  3330. // If the slide exists and is not the current slide...
  3331. if ( !isSameNameAsCurrentSlide ) {
  3332. // ...find the position of the named slide and navigate to it
  3333. var indices = Reveal.getIndices(element);
  3334. slide(indices.h, indices.v);
  3335. }
  3336. }
  3337. // If the slide doesn't exist, navigate to the current slide
  3338. else {
  3339. slide( indexh || 0, indexv || 0 );
  3340. }
  3341. }
  3342. else {
  3343. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3344. // Read the index components of the hash
  3345. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3346. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3347. f;
  3348. if( config.fragmentInURL ) {
  3349. f = parseInt( bits[2], 10 );
  3350. if( isNaN( f ) ) {
  3351. f = undefined;
  3352. }
  3353. }
  3354. if( h !== indexh || v !== indexv || f !== undefined ) {
  3355. slide( h, v, f );
  3356. }
  3357. }
  3358. }
  3359. /**
  3360. * Updates the page URL (hash) to reflect the current
  3361. * state.
  3362. *
  3363. * @param {number} delay The time in ms to wait before
  3364. * writing the hash
  3365. */
  3366. function writeURL( delay ) {
  3367. // Make sure there's never more than one timeout running
  3368. clearTimeout( writeURLTimeout );
  3369. // If a delay is specified, timeout this call
  3370. if( typeof delay === 'number' ) {
  3371. writeURLTimeout = setTimeout( writeURL, delay );
  3372. }
  3373. else if( currentSlide ) {
  3374. // If we're configured to push to history OR the history
  3375. // API is not avaialble.
  3376. if( config.history || !window.history ) {
  3377. window.location.hash = locationHash();
  3378. }
  3379. // If we're configured to refelct the current slide in the
  3380. // URL without pushing to history.
  3381. else if( config.hash ) {
  3382. window.history.replaceState( null, null, '#' + locationHash() );
  3383. }
  3384. // If history and hash are both disabled, a hash may still
  3385. // be added to the URL by clicking on a href with a hash
  3386. // target. Counter this by always removing the hash.
  3387. else {
  3388. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3389. }
  3390. }
  3391. }
  3392. /**
  3393. * Retrieves the h/v location and fragment of the current,
  3394. * or specified, slide.
  3395. *
  3396. * @param {HTMLElement} [slide] If specified, the returned
  3397. * index will be for this slide rather than the currently
  3398. * active one
  3399. *
  3400. * @return {{h: number, v: number, f: number}}
  3401. */
  3402. function getIndices( slide ) {
  3403. // By default, return the current indices
  3404. var h = indexh,
  3405. v = indexv,
  3406. f;
  3407. // If a slide is specified, return the indices of that slide
  3408. if( slide ) {
  3409. var isVertical = isVerticalSlide( slide );
  3410. var slideh = isVertical ? slide.parentNode : slide;
  3411. // Select all horizontal slides
  3412. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3413. // Now that we know which the horizontal slide is, get its index
  3414. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3415. // Assume we're not vertical
  3416. v = undefined;
  3417. // If this is a vertical slide, grab the vertical index
  3418. if( isVertical ) {
  3419. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3420. }
  3421. }
  3422. if( !slide && currentSlide ) {
  3423. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3424. if( hasFragments ) {
  3425. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3426. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3427. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3428. }
  3429. else {
  3430. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3431. }
  3432. }
  3433. }
  3434. return { h: h, v: v, f: f };
  3435. }
  3436. /**
  3437. * Retrieves all slides in this presentation.
  3438. */
  3439. function getSlides() {
  3440. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3441. }
  3442. /**
  3443. * Returns an array of objects where each object represents the
  3444. * attributes on its respective slide.
  3445. */
  3446. function getSlidesAttributes() {
  3447. return getSlides().map( function( slide ) {
  3448. var attributes = {};
  3449. for( var i = 0; i < slide.attributes.length; i++ ) {
  3450. var attribute = slide.attributes[ i ];
  3451. attributes[ attribute.name ] = attribute.value;
  3452. }
  3453. return attributes;
  3454. } );
  3455. }
  3456. /**
  3457. * Retrieves the total number of slides in this presentation.
  3458. *
  3459. * @return {number}
  3460. */
  3461. function getTotalSlides() {
  3462. return getSlides().length;
  3463. }
  3464. /**
  3465. * Returns the slide element matching the specified index.
  3466. *
  3467. * @return {HTMLElement}
  3468. */
  3469. function getSlide( x, y ) {
  3470. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3471. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3472. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3473. return verticalSlides ? verticalSlides[ y ] : undefined;
  3474. }
  3475. return horizontalSlide;
  3476. }
  3477. /**
  3478. * Returns the background element for the given slide.
  3479. * All slides, even the ones with no background properties
  3480. * defined, have a background element so as long as the
  3481. * index is valid an element will be returned.
  3482. *
  3483. * @param {mixed} x Horizontal background index OR a slide
  3484. * HTML element
  3485. * @param {number} y Vertical background index
  3486. * @return {(HTMLElement[]|*)}
  3487. */
  3488. function getSlideBackground( x, y ) {
  3489. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3490. if( slide ) {
  3491. return slide.slideBackgroundElement;
  3492. }
  3493. return undefined;
  3494. }
  3495. /**
  3496. * Retrieves the speaker notes from a slide. Notes can be
  3497. * defined in two ways:
  3498. * 1. As a data-notes attribute on the slide <section>
  3499. * 2. As an <aside class="notes"> inside of the slide
  3500. *
  3501. * @param {HTMLElement} [slide=currentSlide]
  3502. * @return {(string|null)}
  3503. */
  3504. function getSlideNotes( slide ) {
  3505. // Default to the current slide
  3506. slide = slide || currentSlide;
  3507. // Notes can be specified via the data-notes attribute...
  3508. if( slide.hasAttribute( 'data-notes' ) ) {
  3509. return slide.getAttribute( 'data-notes' );
  3510. }
  3511. // ... or using an <aside class="notes"> element
  3512. var notesElement = slide.querySelector( 'aside.notes' );
  3513. if( notesElement ) {
  3514. return notesElement.innerHTML;
  3515. }
  3516. return null;
  3517. }
  3518. /**
  3519. * Retrieves the current state of the presentation as
  3520. * an object. This state can then be restored at any
  3521. * time.
  3522. *
  3523. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3524. */
  3525. function getState() {
  3526. var indices = getIndices();
  3527. return {
  3528. indexh: indices.h,
  3529. indexv: indices.v,
  3530. indexf: indices.f,
  3531. paused: isPaused(),
  3532. overview: isOverview()
  3533. };
  3534. }
  3535. /**
  3536. * Restores the presentation to the given state.
  3537. *
  3538. * @param {object} state As generated by getState()
  3539. * @see {@link getState} generates the parameter `state`
  3540. */
  3541. function setState( state ) {
  3542. if( typeof state === 'object' ) {
  3543. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3544. var pausedFlag = deserialize( state.paused ),
  3545. overviewFlag = deserialize( state.overview );
  3546. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3547. togglePause( pausedFlag );
  3548. }
  3549. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3550. toggleOverview( overviewFlag );
  3551. }
  3552. }
  3553. }
  3554. /**
  3555. * Return a sorted fragments list, ordered by an increasing
  3556. * "data-fragment-index" attribute.
  3557. *
  3558. * Fragments will be revealed in the order that they are returned by
  3559. * this function, so you can use the index attributes to control the
  3560. * order of fragment appearance.
  3561. *
  3562. * To maintain a sensible default fragment order, fragments are presumed
  3563. * to be passed in document order. This function adds a "fragment-index"
  3564. * attribute to each node if such an attribute is not already present,
  3565. * and sets that attribute to an integer value which is the position of
  3566. * the fragment within the fragments list.
  3567. *
  3568. * @param {object[]|*} fragments
  3569. * @param {boolean} grouped If true the returned array will contain
  3570. * nested arrays for all fragments with the same index
  3571. * @return {object[]} sorted Sorted array of fragments
  3572. */
  3573. function sortFragments( fragments, grouped ) {
  3574. fragments = toArray( fragments );
  3575. var ordered = [],
  3576. unordered = [],
  3577. sorted = [];
  3578. // Group ordered and unordered elements
  3579. fragments.forEach( function( fragment, i ) {
  3580. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3581. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3582. if( !ordered[index] ) {
  3583. ordered[index] = [];
  3584. }
  3585. ordered[index].push( fragment );
  3586. }
  3587. else {
  3588. unordered.push( [ fragment ] );
  3589. }
  3590. } );
  3591. // Append fragments without explicit indices in their
  3592. // DOM order
  3593. ordered = ordered.concat( unordered );
  3594. // Manually count the index up per group to ensure there
  3595. // are no gaps
  3596. var index = 0;
  3597. // Push all fragments in their sorted order to an array,
  3598. // this flattens the groups
  3599. ordered.forEach( function( group ) {
  3600. group.forEach( function( fragment ) {
  3601. sorted.push( fragment );
  3602. fragment.setAttribute( 'data-fragment-index', index );
  3603. } );
  3604. index ++;
  3605. } );
  3606. return grouped === true ? ordered : sorted;
  3607. }
  3608. /**
  3609. * Refreshes the fragments on the current slide so that they
  3610. * have the appropriate classes (.visible + .current-fragment).
  3611. *
  3612. * @param {number} [index] The index of the current fragment
  3613. * @param {array} [fragments] Array containing all fragments
  3614. * in the current slide
  3615. *
  3616. * @return {{shown: array, hidden: array}}
  3617. */
  3618. function updateFragments( index, fragments ) {
  3619. var changedFragments = {
  3620. shown: [],
  3621. hidden: []
  3622. };
  3623. if( currentSlide && config.fragments ) {
  3624. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3625. if( fragments.length ) {
  3626. if( typeof index !== 'number' ) {
  3627. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3628. if( currentFragment ) {
  3629. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3630. }
  3631. }
  3632. toArray( fragments ).forEach( function( el, i ) {
  3633. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3634. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3635. }
  3636. // Visible fragments
  3637. if( i <= index ) {
  3638. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3639. el.classList.add( 'visible' );
  3640. el.classList.remove( 'current-fragment' );
  3641. // Announce the fragments one by one to the Screen Reader
  3642. dom.statusDiv.textContent = getStatusText( el );
  3643. if( i === index ) {
  3644. el.classList.add( 'current-fragment' );
  3645. startEmbeddedContent( el );
  3646. }
  3647. }
  3648. // Hidden fragments
  3649. else {
  3650. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3651. el.classList.remove( 'visible' );
  3652. el.classList.remove( 'current-fragment' );
  3653. }
  3654. } );
  3655. }
  3656. }
  3657. return changedFragments;
  3658. }
  3659. /**
  3660. * Navigate to the specified slide fragment.
  3661. *
  3662. * @param {?number} index The index of the fragment that
  3663. * should be shown, -1 means all are invisible
  3664. * @param {number} offset Integer offset to apply to the
  3665. * fragment index
  3666. *
  3667. * @return {boolean} true if a change was made in any
  3668. * fragments visibility as part of this call
  3669. */
  3670. function navigateFragment( index, offset ) {
  3671. if( currentSlide && config.fragments ) {
  3672. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3673. if( fragments.length ) {
  3674. // If no index is specified, find the current
  3675. if( typeof index !== 'number' ) {
  3676. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3677. if( lastVisibleFragment ) {
  3678. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3679. }
  3680. else {
  3681. index = -1;
  3682. }
  3683. }
  3684. // If an offset is specified, apply it to the index
  3685. if( typeof offset === 'number' ) {
  3686. index += offset;
  3687. }
  3688. var changedFragments = updateFragments( index, fragments );
  3689. if( changedFragments.hidden.length ) {
  3690. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3691. }
  3692. if( changedFragments.shown.length ) {
  3693. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3694. }
  3695. updateControls();
  3696. updateProgress();
  3697. if( config.fragmentInURL ) {
  3698. writeURL();
  3699. }
  3700. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3701. }
  3702. }
  3703. return false;
  3704. }
  3705. /**
  3706. * Navigate to the next slide fragment.
  3707. *
  3708. * @return {boolean} true if there was a next fragment,
  3709. * false otherwise
  3710. */
  3711. function nextFragment() {
  3712. return navigateFragment( null, 1 );
  3713. }
  3714. /**
  3715. * Navigate to the previous slide fragment.
  3716. *
  3717. * @return {boolean} true if there was a previous fragment,
  3718. * false otherwise
  3719. */
  3720. function previousFragment() {
  3721. return navigateFragment( null, -1 );
  3722. }
  3723. /**
  3724. * Cues a new automated slide if enabled in the config.
  3725. */
  3726. function cueAutoSlide() {
  3727. cancelAutoSlide();
  3728. if( currentSlide && config.autoSlide !== false ) {
  3729. var fragment = currentSlide.querySelector( '.current-fragment' );
  3730. // When the slide first appears there is no "current" fragment so
  3731. // we look for a data-autoslide timing on the first fragment
  3732. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3733. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3734. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3735. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3736. // Pick value in the following priority order:
  3737. // 1. Current fragment's data-autoslide
  3738. // 2. Current slide's data-autoslide
  3739. // 3. Parent slide's data-autoslide
  3740. // 4. Global autoSlide setting
  3741. if( fragmentAutoSlide ) {
  3742. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3743. }
  3744. else if( slideAutoSlide ) {
  3745. autoSlide = parseInt( slideAutoSlide, 10 );
  3746. }
  3747. else if( parentAutoSlide ) {
  3748. autoSlide = parseInt( parentAutoSlide, 10 );
  3749. }
  3750. else {
  3751. autoSlide = config.autoSlide;
  3752. }
  3753. // If there are media elements with data-autoplay,
  3754. // automatically set the autoSlide duration to the
  3755. // length of that media. Not applicable if the slide
  3756. // is divided up into fragments.
  3757. // playbackRate is accounted for in the duration.
  3758. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3759. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3760. if( el.hasAttribute( 'data-autoplay' ) ) {
  3761. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3762. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3763. }
  3764. }
  3765. } );
  3766. }
  3767. // Cue the next auto-slide if:
  3768. // - There is an autoSlide value
  3769. // - Auto-sliding isn't paused by the user
  3770. // - The presentation isn't paused
  3771. // - The overview isn't active
  3772. // - The presentation isn't over
  3773. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3774. autoSlideTimeout = setTimeout( function() {
  3775. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3776. cueAutoSlide();
  3777. }, autoSlide );
  3778. autoSlideStartTime = Date.now();
  3779. }
  3780. if( autoSlidePlayer ) {
  3781. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3782. }
  3783. }
  3784. }
  3785. /**
  3786. * Cancels any ongoing request to auto-slide.
  3787. */
  3788. function cancelAutoSlide() {
  3789. clearTimeout( autoSlideTimeout );
  3790. autoSlideTimeout = -1;
  3791. }
  3792. function pauseAutoSlide() {
  3793. if( autoSlide && !autoSlidePaused ) {
  3794. autoSlidePaused = true;
  3795. dispatchEvent( 'autoslidepaused' );
  3796. clearTimeout( autoSlideTimeout );
  3797. if( autoSlidePlayer ) {
  3798. autoSlidePlayer.setPlaying( false );
  3799. }
  3800. }
  3801. }
  3802. function resumeAutoSlide() {
  3803. if( autoSlide && autoSlidePaused ) {
  3804. autoSlidePaused = false;
  3805. dispatchEvent( 'autoslideresumed' );
  3806. cueAutoSlide();
  3807. }
  3808. }
  3809. function navigateLeft() {
  3810. // Reverse for RTL
  3811. if( config.rtl ) {
  3812. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3813. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3814. }
  3815. }
  3816. // Normal navigation
  3817. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3818. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3819. }
  3820. }
  3821. function navigateRight() {
  3822. hasNavigatedRight = true;
  3823. // Reverse for RTL
  3824. if( config.rtl ) {
  3825. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3826. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3827. }
  3828. }
  3829. // Normal navigation
  3830. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3831. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3832. }
  3833. }
  3834. function navigateUp() {
  3835. // Prioritize hiding fragments
  3836. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3837. slide( indexh, indexv - 1 );
  3838. }
  3839. }
  3840. function navigateDown() {
  3841. hasNavigatedDown = true;
  3842. // Prioritize revealing fragments
  3843. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3844. slide( indexh, indexv + 1 );
  3845. }
  3846. }
  3847. /**
  3848. * Navigates backwards, prioritized in the following order:
  3849. * 1) Previous fragment
  3850. * 2) Previous vertical slide
  3851. * 3) Previous horizontal slide
  3852. */
  3853. function navigatePrev() {
  3854. // Prioritize revealing fragments
  3855. if( previousFragment() === false ) {
  3856. if( availableRoutes().up ) {
  3857. navigateUp();
  3858. }
  3859. else {
  3860. // Fetch the previous horizontal slide, if there is one
  3861. var previousSlide;
  3862. if( config.rtl ) {
  3863. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3864. }
  3865. else {
  3866. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3867. }
  3868. if( previousSlide ) {
  3869. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3870. var h = indexh - 1;
  3871. slide( h, v );
  3872. }
  3873. }
  3874. }
  3875. }
  3876. /**
  3877. * The reverse of #navigatePrev().
  3878. */
  3879. function navigateNext() {
  3880. hasNavigatedRight = true;
  3881. hasNavigatedDown = true;
  3882. // Prioritize revealing fragments
  3883. if( nextFragment() === false ) {
  3884. var routes = availableRoutes();
  3885. // When looping is enabled `routes.down` is always available
  3886. // so we need a separate check for when we've reached the
  3887. // end of a stack and should move horizontally
  3888. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3889. routes.down = false;
  3890. }
  3891. if( routes.down ) {
  3892. navigateDown();
  3893. }
  3894. else if( config.rtl ) {
  3895. navigateLeft();
  3896. }
  3897. else {
  3898. navigateRight();
  3899. }
  3900. }
  3901. }
  3902. /**
  3903. * Checks if the target element prevents the triggering of
  3904. * swipe navigation.
  3905. */
  3906. function isSwipePrevented( target ) {
  3907. while( target && typeof target.hasAttribute === 'function' ) {
  3908. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3909. target = target.parentNode;
  3910. }
  3911. return false;
  3912. }
  3913. // --------------------------------------------------------------------//
  3914. // ----------------------------- EVENTS -------------------------------//
  3915. // --------------------------------------------------------------------//
  3916. /**
  3917. * Called by all event handlers that are based on user
  3918. * input.
  3919. *
  3920. * @param {object} [event]
  3921. */
  3922. function onUserInput( event ) {
  3923. if( config.autoSlideStoppable ) {
  3924. pauseAutoSlide();
  3925. }
  3926. }
  3927. /**
  3928. * Called whenever there is mouse input at the document level
  3929. * to determine if the cursor is active or not.
  3930. *
  3931. * @param {object} event
  3932. */
  3933. function onDocumentCursorActive( event ) {
  3934. showCursor();
  3935. clearTimeout( cursorInactiveTimeout );
  3936. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3937. }
  3938. /**
  3939. * Handler for the document level 'keypress' event.
  3940. *
  3941. * @param {object} event
  3942. */
  3943. function onDocumentKeyPress( event ) {
  3944. // Check if the pressed key is question mark
  3945. if( event.shiftKey && event.charCode === 63 ) {
  3946. toggleHelp();
  3947. }
  3948. }
  3949. /**
  3950. * Handler for the document level 'keydown' event.
  3951. *
  3952. * @param {object} event
  3953. */
  3954. function onDocumentKeyDown( event ) {
  3955. // If there's a condition specified and it returns false,
  3956. // ignore this event
  3957. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3958. return true;
  3959. }
  3960. // Shorthand
  3961. var keyCode = event.keyCode;
  3962. // Remember if auto-sliding was paused so we can toggle it
  3963. var autoSlideWasPaused = autoSlidePaused;
  3964. onUserInput( event );
  3965. // Is there a focused element that could be using the keyboard?
  3966. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3967. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3968. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3969. // Whitelist specific modified + keycode combinations
  3970. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3971. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 37;
  3972. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 39;
  3973. // Prevent all other events when a modifier is pressed
  3974. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3975. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  3976. // Disregard the event if there's a focused element or a
  3977. // keyboard modifier key is present
  3978. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  3979. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3980. var resumeKeyCodes = [66,86,190,191];
  3981. var key;
  3982. // Custom key bindings for togglePause should be able to resume
  3983. if( typeof config.keyboard === 'object' ) {
  3984. for( key in config.keyboard ) {
  3985. if( config.keyboard[key] === 'togglePause' ) {
  3986. resumeKeyCodes.push( parseInt( key, 10 ) );
  3987. }
  3988. }
  3989. }
  3990. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  3991. return false;
  3992. }
  3993. var triggered = false;
  3994. // 1. User defined key bindings
  3995. if( typeof config.keyboard === 'object' ) {
  3996. for( key in config.keyboard ) {
  3997. // Check if this binding matches the pressed key
  3998. if( parseInt( key, 10 ) === keyCode ) {
  3999. var value = config.keyboard[ key ];
  4000. // Callback function
  4001. if( typeof value === 'function' ) {
  4002. value.apply( null, [ event ] );
  4003. }
  4004. // String shortcuts to reveal.js API
  4005. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4006. Reveal[ value ].call();
  4007. }
  4008. triggered = true;
  4009. }
  4010. }
  4011. }
  4012. // 2. Registered custom key bindings
  4013. if( triggered === false ) {
  4014. for( key in registeredKeyBindings ) {
  4015. // Check if this binding matches the pressed key
  4016. if( parseInt( key, 10 ) === keyCode ) {
  4017. var action = registeredKeyBindings[ key ].callback;
  4018. // Callback function
  4019. if( typeof action === 'function' ) {
  4020. action.apply( null, [ event ] );
  4021. }
  4022. // String shortcuts to reveal.js API
  4023. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4024. Reveal[ action ].call();
  4025. }
  4026. triggered = true;
  4027. }
  4028. }
  4029. }
  4030. // 3. System defined key bindings
  4031. if( triggered === false ) {
  4032. // Assume true and try to prove false
  4033. triggered = true;
  4034. // P, PAGE UP
  4035. if( keyCode === 80 || keyCode === 33 ) {
  4036. navigatePrev();
  4037. }
  4038. // N, PAGE DOWN
  4039. else if( keyCode === 78 || keyCode === 34 ) {
  4040. navigateNext();
  4041. }
  4042. // H, LEFT
  4043. else if( keyCode === 72 || keyCode === 37 ) {
  4044. if( firstSlideShortcut ) {
  4045. slide( 0 );
  4046. }
  4047. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4048. navigatePrev();
  4049. }
  4050. else {
  4051. navigateLeft();
  4052. }
  4053. }
  4054. // L, RIGHT
  4055. else if( keyCode === 76 || keyCode === 39 ) {
  4056. if( lastSlideShortcut ) {
  4057. slide( Number.MAX_VALUE );
  4058. }
  4059. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4060. navigateNext();
  4061. }
  4062. else {
  4063. navigateRight();
  4064. }
  4065. }
  4066. // K, UP
  4067. else if( keyCode === 75 || keyCode === 38 ) {
  4068. if( !isOverview() && config.navigationMode === 'linear' ) {
  4069. navigatePrev();
  4070. }
  4071. else {
  4072. navigateUp();
  4073. }
  4074. }
  4075. // J, DOWN
  4076. else if( keyCode === 74 || keyCode === 40 ) {
  4077. if( !isOverview() && config.navigationMode === 'linear' ) {
  4078. navigateNext();
  4079. }
  4080. else {
  4081. navigateDown();
  4082. }
  4083. }
  4084. // HOME
  4085. else if( keyCode === 36 ) {
  4086. slide( 0 );
  4087. }
  4088. // END
  4089. else if( keyCode === 35 ) {
  4090. slide( Number.MAX_VALUE );
  4091. }
  4092. // SPACE
  4093. else if( keyCode === 32 ) {
  4094. if( isOverview() ) {
  4095. deactivateOverview();
  4096. }
  4097. if( event.shiftKey ) {
  4098. navigatePrev();
  4099. }
  4100. else {
  4101. navigateNext();
  4102. }
  4103. }
  4104. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4105. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4106. togglePause();
  4107. }
  4108. // F
  4109. else if( keyCode === 70 ) {
  4110. enterFullscreen();
  4111. }
  4112. // A
  4113. else if( keyCode === 65 ) {
  4114. if ( config.autoSlideStoppable ) {
  4115. toggleAutoSlide( autoSlideWasPaused );
  4116. }
  4117. }
  4118. else {
  4119. triggered = false;
  4120. }
  4121. }
  4122. // If the input resulted in a triggered action we should prevent
  4123. // the browsers default behavior
  4124. if( triggered ) {
  4125. event.preventDefault && event.preventDefault();
  4126. }
  4127. // ESC or O key
  4128. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4129. if( dom.overlay ) {
  4130. closeOverlay();
  4131. }
  4132. else {
  4133. toggleOverview();
  4134. }
  4135. event.preventDefault && event.preventDefault();
  4136. }
  4137. // If auto-sliding is enabled we need to cue up
  4138. // another timeout
  4139. cueAutoSlide();
  4140. }
  4141. /**
  4142. * Handler for the 'touchstart' event, enables support for
  4143. * swipe and pinch gestures.
  4144. *
  4145. * @param {object} event
  4146. */
  4147. function onTouchStart( event ) {
  4148. if( isSwipePrevented( event.target ) ) return true;
  4149. touch.startX = event.touches[0].clientX;
  4150. touch.startY = event.touches[0].clientY;
  4151. touch.startCount = event.touches.length;
  4152. }
  4153. /**
  4154. * Handler for the 'touchmove' event.
  4155. *
  4156. * @param {object} event
  4157. */
  4158. function onTouchMove( event ) {
  4159. if( isSwipePrevented( event.target ) ) return true;
  4160. // Each touch should only trigger one action
  4161. if( !touch.captured ) {
  4162. onUserInput( event );
  4163. var currentX = event.touches[0].clientX;
  4164. var currentY = event.touches[0].clientY;
  4165. // There was only one touch point, look for a swipe
  4166. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4167. var deltaX = currentX - touch.startX,
  4168. deltaY = currentY - touch.startY;
  4169. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4170. touch.captured = true;
  4171. navigateLeft();
  4172. }
  4173. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4174. touch.captured = true;
  4175. navigateRight();
  4176. }
  4177. else if( deltaY > touch.threshold ) {
  4178. touch.captured = true;
  4179. navigateUp();
  4180. }
  4181. else if( deltaY < -touch.threshold ) {
  4182. touch.captured = true;
  4183. navigateDown();
  4184. }
  4185. // If we're embedded, only block touch events if they have
  4186. // triggered an action
  4187. if( config.embedded ) {
  4188. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4189. event.preventDefault();
  4190. }
  4191. }
  4192. // Not embedded? Block them all to avoid needless tossing
  4193. // around of the viewport in iOS
  4194. else {
  4195. event.preventDefault();
  4196. }
  4197. }
  4198. }
  4199. // There's a bug with swiping on some Android devices unless
  4200. // the default action is always prevented
  4201. else if( UA.match( /android/gi ) ) {
  4202. event.preventDefault();
  4203. }
  4204. }
  4205. /**
  4206. * Handler for the 'touchend' event.
  4207. *
  4208. * @param {object} event
  4209. */
  4210. function onTouchEnd( event ) {
  4211. touch.captured = false;
  4212. }
  4213. /**
  4214. * Convert pointer down to touch start.
  4215. *
  4216. * @param {object} event
  4217. */
  4218. function onPointerDown( event ) {
  4219. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4220. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4221. onTouchStart( event );
  4222. }
  4223. }
  4224. /**
  4225. * Convert pointer move to touch move.
  4226. *
  4227. * @param {object} event
  4228. */
  4229. function onPointerMove( event ) {
  4230. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4231. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4232. onTouchMove( event );
  4233. }
  4234. }
  4235. /**
  4236. * Convert pointer up to touch end.
  4237. *
  4238. * @param {object} event
  4239. */
  4240. function onPointerUp( event ) {
  4241. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4242. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4243. onTouchEnd( event );
  4244. }
  4245. }
  4246. /**
  4247. * Handles mouse wheel scrolling, throttled to avoid skipping
  4248. * multiple slides.
  4249. *
  4250. * @param {object} event
  4251. */
  4252. function onDocumentMouseScroll( event ) {
  4253. if( Date.now() - lastMouseWheelStep > 600 ) {
  4254. lastMouseWheelStep = Date.now();
  4255. var delta = event.detail || -event.wheelDelta;
  4256. if( delta > 0 ) {
  4257. navigateNext();
  4258. }
  4259. else if( delta < 0 ) {
  4260. navigatePrev();
  4261. }
  4262. }
  4263. }
  4264. /**
  4265. * Clicking on the progress bar results in a navigation to the
  4266. * closest approximate horizontal slide using this equation:
  4267. *
  4268. * ( clickX / presentationWidth ) * numberOfSlides
  4269. *
  4270. * @param {object} event
  4271. */
  4272. function onProgressClicked( event ) {
  4273. onUserInput( event );
  4274. event.preventDefault();
  4275. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4276. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4277. if( config.rtl ) {
  4278. slideIndex = slidesTotal - slideIndex;
  4279. }
  4280. slide( slideIndex );
  4281. }
  4282. /**
  4283. * Event handler for navigation control buttons.
  4284. */
  4285. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4286. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4287. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4288. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4289. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4290. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4291. /**
  4292. * Handler for the window level 'hashchange' event.
  4293. *
  4294. * @param {object} [event]
  4295. */
  4296. function onWindowHashChange( event ) {
  4297. readURL();
  4298. }
  4299. /**
  4300. * Handler for the window level 'resize' event.
  4301. *
  4302. * @param {object} [event]
  4303. */
  4304. function onWindowResize( event ) {
  4305. layout();
  4306. }
  4307. /**
  4308. * Handle for the window level 'visibilitychange' event.
  4309. *
  4310. * @param {object} [event]
  4311. */
  4312. function onPageVisibilityChange( event ) {
  4313. var isHidden = document.webkitHidden ||
  4314. document.msHidden ||
  4315. document.hidden;
  4316. // If, after clicking a link or similar and we're coming back,
  4317. // focus the document.body to ensure we can use keyboard shortcuts
  4318. if( isHidden === false && document.activeElement !== document.body ) {
  4319. // Not all elements support .blur() - SVGs among them.
  4320. if( typeof document.activeElement.blur === 'function' ) {
  4321. document.activeElement.blur();
  4322. }
  4323. document.body.focus();
  4324. }
  4325. }
  4326. /**
  4327. * Invoked when a slide is and we're in the overview.
  4328. *
  4329. * @param {object} event
  4330. */
  4331. function onOverviewSlideClicked( event ) {
  4332. // TODO There's a bug here where the event listeners are not
  4333. // removed after deactivating the overview.
  4334. if( eventsAreBound && isOverview() ) {
  4335. event.preventDefault();
  4336. var element = event.target;
  4337. while( element && !element.nodeName.match( /section/gi ) ) {
  4338. element = element.parentNode;
  4339. }
  4340. if( element && !element.classList.contains( 'disabled' ) ) {
  4341. deactivateOverview();
  4342. if( element.nodeName.match( /section/gi ) ) {
  4343. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4344. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4345. slide( h, v );
  4346. }
  4347. }
  4348. }
  4349. }
  4350. /**
  4351. * Handles clicks on links that are set to preview in the
  4352. * iframe overlay.
  4353. *
  4354. * @param {object} event
  4355. */
  4356. function onPreviewLinkClicked( event ) {
  4357. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4358. var url = event.currentTarget.getAttribute( 'href' );
  4359. if( url ) {
  4360. showPreview( url );
  4361. event.preventDefault();
  4362. }
  4363. }
  4364. }
  4365. /**
  4366. * Handles click on the auto-sliding controls element.
  4367. *
  4368. * @param {object} [event]
  4369. */
  4370. function onAutoSlidePlayerClick( event ) {
  4371. // Replay
  4372. if( Reveal.isLastSlide() && config.loop === false ) {
  4373. slide( 0, 0 );
  4374. resumeAutoSlide();
  4375. }
  4376. // Resume
  4377. else if( autoSlidePaused ) {
  4378. resumeAutoSlide();
  4379. }
  4380. // Pause
  4381. else {
  4382. pauseAutoSlide();
  4383. }
  4384. }
  4385. // --------------------------------------------------------------------//
  4386. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4387. // --------------------------------------------------------------------//
  4388. /**
  4389. * Constructor for the playback component, which displays
  4390. * play/pause/progress controls.
  4391. *
  4392. * @param {HTMLElement} container The component will append
  4393. * itself to this
  4394. * @param {function} progressCheck A method which will be
  4395. * called frequently to get the current progress on a range
  4396. * of 0-1
  4397. */
  4398. function Playback( container, progressCheck ) {
  4399. // Cosmetics
  4400. this.diameter = 100;
  4401. this.diameter2 = this.diameter/2;
  4402. this.thickness = 6;
  4403. // Flags if we are currently playing
  4404. this.playing = false;
  4405. // Current progress on a 0-1 range
  4406. this.progress = 0;
  4407. // Used to loop the animation smoothly
  4408. this.progressOffset = 1;
  4409. this.container = container;
  4410. this.progressCheck = progressCheck;
  4411. this.canvas = document.createElement( 'canvas' );
  4412. this.canvas.className = 'playback';
  4413. this.canvas.width = this.diameter;
  4414. this.canvas.height = this.diameter;
  4415. this.canvas.style.width = this.diameter2 + 'px';
  4416. this.canvas.style.height = this.diameter2 + 'px';
  4417. this.context = this.canvas.getContext( '2d' );
  4418. this.container.appendChild( this.canvas );
  4419. this.render();
  4420. }
  4421. /**
  4422. * @param value
  4423. */
  4424. Playback.prototype.setPlaying = function( value ) {
  4425. var wasPlaying = this.playing;
  4426. this.playing = value;
  4427. // Start repainting if we weren't already
  4428. if( !wasPlaying && this.playing ) {
  4429. this.animate();
  4430. }
  4431. else {
  4432. this.render();
  4433. }
  4434. };
  4435. Playback.prototype.animate = function() {
  4436. var progressBefore = this.progress;
  4437. this.progress = this.progressCheck();
  4438. // When we loop, offset the progress so that it eases
  4439. // smoothly rather than immediately resetting
  4440. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4441. this.progressOffset = this.progress;
  4442. }
  4443. this.render();
  4444. if( this.playing ) {
  4445. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4446. }
  4447. };
  4448. /**
  4449. * Renders the current progress and playback state.
  4450. */
  4451. Playback.prototype.render = function() {
  4452. var progress = this.playing ? this.progress : 0,
  4453. radius = ( this.diameter2 ) - this.thickness,
  4454. x = this.diameter2,
  4455. y = this.diameter2,
  4456. iconSize = 28;
  4457. // Ease towards 1
  4458. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4459. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4460. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4461. this.context.save();
  4462. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4463. // Solid background color
  4464. this.context.beginPath();
  4465. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4466. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4467. this.context.fill();
  4468. // Draw progress track
  4469. this.context.beginPath();
  4470. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4471. this.context.lineWidth = this.thickness;
  4472. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4473. this.context.stroke();
  4474. if( this.playing ) {
  4475. // Draw progress on top of track
  4476. this.context.beginPath();
  4477. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4478. this.context.lineWidth = this.thickness;
  4479. this.context.strokeStyle = '#fff';
  4480. this.context.stroke();
  4481. }
  4482. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4483. // Draw play/pause icons
  4484. if( this.playing ) {
  4485. this.context.fillStyle = '#fff';
  4486. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4487. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4488. }
  4489. else {
  4490. this.context.beginPath();
  4491. this.context.translate( 4, 0 );
  4492. this.context.moveTo( 0, 0 );
  4493. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4494. this.context.lineTo( 0, iconSize );
  4495. this.context.fillStyle = '#fff';
  4496. this.context.fill();
  4497. }
  4498. this.context.restore();
  4499. };
  4500. Playback.prototype.on = function( type, listener ) {
  4501. this.canvas.addEventListener( type, listener, false );
  4502. };
  4503. Playback.prototype.off = function( type, listener ) {
  4504. this.canvas.removeEventListener( type, listener, false );
  4505. };
  4506. Playback.prototype.destroy = function() {
  4507. this.playing = false;
  4508. if( this.canvas.parentNode ) {
  4509. this.container.removeChild( this.canvas );
  4510. }
  4511. };
  4512. // --------------------------------------------------------------------//
  4513. // ------------------------------- API --------------------------------//
  4514. // --------------------------------------------------------------------//
  4515. Reveal = {
  4516. VERSION: VERSION,
  4517. initialize: initialize,
  4518. configure: configure,
  4519. sync: sync,
  4520. syncSlide: syncSlide,
  4521. syncFragments: syncFragments,
  4522. // Navigation methods
  4523. slide: slide,
  4524. left: navigateLeft,
  4525. right: navigateRight,
  4526. up: navigateUp,
  4527. down: navigateDown,
  4528. prev: navigatePrev,
  4529. next: navigateNext,
  4530. // Fragment methods
  4531. navigateFragment: navigateFragment,
  4532. prevFragment: previousFragment,
  4533. nextFragment: nextFragment,
  4534. // Deprecated aliases
  4535. navigateTo: slide,
  4536. navigateLeft: navigateLeft,
  4537. navigateRight: navigateRight,
  4538. navigateUp: navigateUp,
  4539. navigateDown: navigateDown,
  4540. navigatePrev: navigatePrev,
  4541. navigateNext: navigateNext,
  4542. // Forces an update in slide layout
  4543. layout: layout,
  4544. // Randomizes the order of slides
  4545. shuffle: shuffle,
  4546. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4547. availableRoutes: availableRoutes,
  4548. // Returns an object with the available fragments as booleans (prev/next)
  4549. availableFragments: availableFragments,
  4550. // Toggles a help overlay with keyboard shortcuts
  4551. toggleHelp: toggleHelp,
  4552. // Toggles the overview mode on/off
  4553. toggleOverview: toggleOverview,
  4554. // Toggles the "black screen" mode on/off
  4555. togglePause: togglePause,
  4556. // Toggles the auto slide mode on/off
  4557. toggleAutoSlide: toggleAutoSlide,
  4558. // State checks
  4559. isOverview: isOverview,
  4560. isPaused: isPaused,
  4561. isAutoSliding: isAutoSliding,
  4562. isSpeakerNotes: isSpeakerNotes,
  4563. // Slide preloading
  4564. loadSlide: loadSlide,
  4565. unloadSlide: unloadSlide,
  4566. // Adds or removes all internal event listeners (such as keyboard)
  4567. addEventListeners: addEventListeners,
  4568. removeEventListeners: removeEventListeners,
  4569. // Facility for persisting and restoring the presentation state
  4570. getState: getState,
  4571. setState: setState,
  4572. // Presentation progress
  4573. getSlidePastCount: getSlidePastCount,
  4574. // Presentation progress on range of 0-1
  4575. getProgress: getProgress,
  4576. // Returns the indices of the current, or specified, slide
  4577. getIndices: getIndices,
  4578. // Returns an Array of all slides
  4579. getSlides: getSlides,
  4580. // Returns an Array of objects representing the attributes on
  4581. // the slides
  4582. getSlidesAttributes: getSlidesAttributes,
  4583. // Returns the total number of slides
  4584. getTotalSlides: getTotalSlides,
  4585. // Returns the slide element at the specified index
  4586. getSlide: getSlide,
  4587. // Returns the slide background element at the specified index
  4588. getSlideBackground: getSlideBackground,
  4589. // Returns the speaker notes string for a slide, or null
  4590. getSlideNotes: getSlideNotes,
  4591. // Returns the previous slide element, may be null
  4592. getPreviousSlide: function() {
  4593. return previousSlide;
  4594. },
  4595. // Returns the current slide element
  4596. getCurrentSlide: function() {
  4597. return currentSlide;
  4598. },
  4599. // Returns the current scale of the presentation content
  4600. getScale: function() {
  4601. return scale;
  4602. },
  4603. // Returns the current configuration object
  4604. getConfig: function() {
  4605. return config;
  4606. },
  4607. // Helper method, retrieves query string as a key/value hash
  4608. getQueryHash: function() {
  4609. var query = {};
  4610. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4611. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4612. } );
  4613. // Basic deserialization
  4614. for( var i in query ) {
  4615. var value = query[ i ];
  4616. query[ i ] = deserialize( unescape( value ) );
  4617. }
  4618. return query;
  4619. },
  4620. // Returns the top-level DOM element
  4621. getRevealElement: function() {
  4622. return dom.wrapper || document.querySelector( '.reveal' );
  4623. },
  4624. // Returns a hash with all registered plugins
  4625. getPlugins: function() {
  4626. return plugins;
  4627. },
  4628. // Returns true if we're currently on the first slide
  4629. isFirstSlide: function() {
  4630. return ( indexh === 0 && indexv === 0 );
  4631. },
  4632. // Returns true if we're currently on the last slide
  4633. isLastSlide: function() {
  4634. if( currentSlide ) {
  4635. // Does this slide have a next sibling?
  4636. if( currentSlide.nextElementSibling ) return false;
  4637. // If it's vertical, does its parent have a next sibling?
  4638. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4639. return true;
  4640. }
  4641. return false;
  4642. },
  4643. // Returns true if we're on the last slide in the current
  4644. // vertical stack
  4645. isLastVerticalSlide: function() {
  4646. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4647. // Does this slide have a next sibling?
  4648. if( currentSlide.nextElementSibling ) return false;
  4649. return true;
  4650. }
  4651. return false;
  4652. },
  4653. // Checks if reveal.js has been loaded and is ready for use
  4654. isReady: function() {
  4655. return loaded;
  4656. },
  4657. // Forward event binding to the reveal DOM element
  4658. addEventListener: function( type, listener, useCapture ) {
  4659. if( 'addEventListener' in window ) {
  4660. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4661. }
  4662. },
  4663. removeEventListener: function( type, listener, useCapture ) {
  4664. if( 'addEventListener' in window ) {
  4665. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4666. }
  4667. },
  4668. // Adds/remvoes a custom key binding
  4669. addKeyBinding: addKeyBinding,
  4670. removeKeyBinding: removeKeyBinding,
  4671. // Called by plugins to register themselves
  4672. registerPlugin: registerPlugin,
  4673. // Programatically triggers a keyboard event
  4674. triggerKey: function( keyCode ) {
  4675. onDocumentKeyDown( { keyCode: keyCode } );
  4676. },
  4677. // Registers a new shortcut to include in the help overlay
  4678. registerKeyboardShortcut: function( key, value ) {
  4679. keyboardShortcuts[key] = value;
  4680. }
  4681. };
  4682. return Reveal;
  4683. }));