speaker-view.html 22 KB

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  1. <!--
  2. NOTE: You need to build the notes plugin after making changes to this file.
  3. -->
  4. <html lang="en">
  5. <head>
  6. <meta charset="utf-8">
  7. <title>reveal.js - Speaker View</title>
  8. <style>
  9. body {
  10. font-family: Helvetica;
  11. font-size: 18px;
  12. }
  13. #current-slide,
  14. #upcoming-slide,
  15. #speaker-controls {
  16. padding: 6px;
  17. box-sizing: border-box;
  18. -moz-box-sizing: border-box;
  19. }
  20. #current-slide iframe,
  21. #upcoming-slide iframe {
  22. width: 100%;
  23. height: 100%;
  24. border: 1px solid #ddd;
  25. }
  26. #current-slide .label,
  27. #upcoming-slide .label {
  28. position: absolute;
  29. top: 10px;
  30. left: 10px;
  31. z-index: 2;
  32. }
  33. #connection-status {
  34. position: absolute;
  35. top: 0;
  36. left: 0;
  37. width: 100%;
  38. height: 100%;
  39. z-index: 20;
  40. padding: 30% 20% 20% 20%;
  41. font-size: 18px;
  42. color: #222;
  43. background: #fff;
  44. text-align: center;
  45. box-sizing: border-box;
  46. line-height: 1.4;
  47. }
  48. .overlay-element {
  49. height: 34px;
  50. line-height: 34px;
  51. padding: 0 10px;
  52. text-shadow: none;
  53. background: rgba( 220, 220, 220, 0.8 );
  54. color: #222;
  55. font-size: 14px;
  56. }
  57. .overlay-element.interactive:hover {
  58. background: rgba( 220, 220, 220, 1 );
  59. }
  60. #current-slide {
  61. position: absolute;
  62. width: 60%;
  63. height: 100%;
  64. top: 0;
  65. left: 0;
  66. padding-right: 0;
  67. }
  68. #upcoming-slide {
  69. position: absolute;
  70. width: 40%;
  71. height: 40%;
  72. right: 0;
  73. top: 0;
  74. }
  75. /* Speaker controls */
  76. #speaker-controls {
  77. position: absolute;
  78. top: 40%;
  79. right: 0;
  80. width: 40%;
  81. height: 60%;
  82. overflow: auto;
  83. font-size: 18px;
  84. }
  85. .speaker-controls-time.hidden,
  86. .speaker-controls-notes.hidden {
  87. display: none;
  88. }
  89. .speaker-controls-time .label,
  90. .speaker-controls-pace .label,
  91. .speaker-controls-notes .label {
  92. text-transform: uppercase;
  93. font-weight: normal;
  94. font-size: 0.66em;
  95. color: #666;
  96. margin: 0;
  97. }
  98. .speaker-controls-time, .speaker-controls-pace {
  99. border-bottom: 1px solid rgba( 200, 200, 200, 0.5 );
  100. margin-bottom: 10px;
  101. padding: 10px 16px;
  102. padding-bottom: 20px;
  103. cursor: pointer;
  104. }
  105. .speaker-controls-time .reset-button {
  106. opacity: 0;
  107. float: right;
  108. color: #666;
  109. text-decoration: none;
  110. }
  111. .speaker-controls-time:hover .reset-button {
  112. opacity: 1;
  113. }
  114. .speaker-controls-time .timer,
  115. .speaker-controls-time .clock {
  116. width: 50%;
  117. }
  118. .speaker-controls-time .timer,
  119. .speaker-controls-time .clock,
  120. .speaker-controls-time .pacing .hours-value,
  121. .speaker-controls-time .pacing .minutes-value,
  122. .speaker-controls-time .pacing .seconds-value {
  123. font-size: 1.9em;
  124. }
  125. .speaker-controls-time .timer {
  126. float: left;
  127. }
  128. .speaker-controls-time .clock {
  129. float: right;
  130. text-align: right;
  131. }
  132. .speaker-controls-time span.mute {
  133. opacity: 0.3;
  134. }
  135. .speaker-controls-time .pacing-title {
  136. margin-top: 5px;
  137. }
  138. .speaker-controls-time .pacing.ahead {
  139. color: blue;
  140. }
  141. .speaker-controls-time .pacing.on-track {
  142. color: green;
  143. }
  144. .speaker-controls-time .pacing.behind {
  145. color: red;
  146. }
  147. .speaker-controls-notes {
  148. padding: 10px 16px;
  149. }
  150. .speaker-controls-notes .value {
  151. margin-top: 5px;
  152. line-height: 1.4;
  153. font-size: 1.2em;
  154. }
  155. /* Layout selector */
  156. #speaker-layout {
  157. position: absolute;
  158. top: 10px;
  159. right: 10px;
  160. color: #222;
  161. z-index: 10;
  162. }
  163. #speaker-layout select {
  164. position: absolute;
  165. width: 100%;
  166. height: 100%;
  167. top: 0;
  168. left: 0;
  169. border: 0;
  170. box-shadow: 0;
  171. cursor: pointer;
  172. opacity: 0;
  173. font-size: 1em;
  174. background-color: transparent;
  175. -moz-appearance: none;
  176. -webkit-appearance: none;
  177. -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  178. }
  179. #speaker-layout select:focus {
  180. outline: none;
  181. box-shadow: none;
  182. }
  183. .clear {
  184. clear: both;
  185. }
  186. /* Speaker layout: Wide */
  187. body[data-speaker-layout="wide"] #current-slide,
  188. body[data-speaker-layout="wide"] #upcoming-slide {
  189. width: 50%;
  190. height: 45%;
  191. padding: 6px;
  192. }
  193. body[data-speaker-layout="wide"] #current-slide {
  194. top: 0;
  195. left: 0;
  196. }
  197. body[data-speaker-layout="wide"] #upcoming-slide {
  198. top: 0;
  199. left: 50%;
  200. }
  201. body[data-speaker-layout="wide"] #speaker-controls {
  202. top: 45%;
  203. left: 0;
  204. width: 100%;
  205. height: 50%;
  206. font-size: 1.25em;
  207. }
  208. /* Speaker layout: Tall */
  209. body[data-speaker-layout="tall"] #current-slide,
  210. body[data-speaker-layout="tall"] #upcoming-slide {
  211. width: 45%;
  212. height: 50%;
  213. padding: 6px;
  214. }
  215. body[data-speaker-layout="tall"] #current-slide {
  216. top: 0;
  217. left: 0;
  218. }
  219. body[data-speaker-layout="tall"] #upcoming-slide {
  220. top: 50%;
  221. left: 0;
  222. }
  223. body[data-speaker-layout="tall"] #speaker-controls {
  224. padding-top: 40px;
  225. top: 0;
  226. left: 45%;
  227. width: 55%;
  228. height: 100%;
  229. font-size: 1.25em;
  230. }
  231. /* Speaker layout: Notes only */
  232. body[data-speaker-layout="notes-only"] #current-slide,
  233. body[data-speaker-layout="notes-only"] #upcoming-slide {
  234. display: none;
  235. }
  236. body[data-speaker-layout="notes-only"] #speaker-controls {
  237. padding-top: 40px;
  238. top: 0;
  239. left: 0;
  240. width: 100%;
  241. height: 100%;
  242. font-size: 1.25em;
  243. }
  244. @media screen and (max-width: 1080px) {
  245. body[data-speaker-layout="default"] #speaker-controls {
  246. font-size: 16px;
  247. }
  248. }
  249. @media screen and (max-width: 900px) {
  250. body[data-speaker-layout="default"] #speaker-controls {
  251. font-size: 14px;
  252. }
  253. }
  254. @media screen and (max-width: 800px) {
  255. body[data-speaker-layout="default"] #speaker-controls {
  256. font-size: 12px;
  257. }
  258. }
  259. </style>
  260. </head>
  261. <body>
  262. <div id="connection-status">Loading speaker view...</div>
  263. <div id="current-slide"></div>
  264. <div id="upcoming-slide"><span class="overlay-element label">Upcoming</span></div>
  265. <div id="speaker-controls">
  266. <div class="speaker-controls-time">
  267. <h4 class="label">Time <span class="reset-button">Click to Reset</span></h4>
  268. <div class="clock">
  269. <span class="clock-value">0:00 AM</span>
  270. </div>
  271. <div class="timer">
  272. <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
  273. </div>
  274. <div class="clear"></div>
  275. <h4 class="label pacing-title" style="display: none">Pacing – Time to finish current slide</h4>
  276. <div class="pacing" style="display: none">
  277. <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
  278. </div>
  279. </div>
  280. <div class="speaker-controls-notes hidden">
  281. <h4 class="label">Notes</h4>
  282. <div class="value"></div>
  283. </div>
  284. </div>
  285. <div id="speaker-layout" class="overlay-element interactive">
  286. <span class="speaker-layout-label"></span>
  287. <select class="speaker-layout-dropdown"></select>
  288. </div>
  289. <script>
  290. (function() {
  291. var notes,
  292. notesValue,
  293. currentState,
  294. currentSlide,
  295. upcomingSlide,
  296. layoutLabel,
  297. layoutDropdown,
  298. pendingCalls = {},
  299. lastRevealApiCallId = 0,
  300. connected = false;
  301. var SPEAKER_LAYOUTS = {
  302. 'default': 'Default',
  303. 'wide': 'Wide',
  304. 'tall': 'Tall',
  305. 'notes-only': 'Notes only'
  306. };
  307. setupLayout();
  308. var connectionStatus = document.querySelector( '#connection-status' );
  309. var connectionTimeout = setTimeout( function() {
  310. connectionStatus.innerHTML = 'Error connecting to main window.<br>Please try closing and reopening the speaker view.';
  311. }, 5000 );
  312. window.addEventListener( 'message', function( event ) {
  313. if (window.location.origin !== event.origin){
  314. return;
  315. }
  316. clearTimeout( connectionTimeout );
  317. connectionStatus.style.display = 'none';
  318. var data = JSON.parse( event.data );
  319. // The overview mode is only useful to the reveal.js instance
  320. // where navigation occurs so we don't sync it
  321. if( data.state ) delete data.state.overview;
  322. // Messages sent by the notes plugin inside of the main window
  323. if( data && data.namespace === 'reveal-notes' ) {
  324. if( data.type === 'connect' ) {
  325. handleConnectMessage( data );
  326. }
  327. else if( data.type === 'state' ) {
  328. handleStateMessage( data );
  329. }
  330. else if( data.type === 'return' ) {
  331. pendingCalls[data.callId](data.result);
  332. delete pendingCalls[data.callId];
  333. }
  334. }
  335. // Messages sent by the reveal.js inside of the current slide preview
  336. else if( data && data.namespace === 'reveal' ) {
  337. if( /ready/.test( data.eventName ) ) {
  338. // Send a message back to notify that the handshake is complete
  339. window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'connected'} ), '*' );
  340. }
  341. else if( /slidechanged|fragmentshown|fragmenthidden|paused|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {
  342. window.opener.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ]} ), '*' );
  343. }
  344. }
  345. } );
  346. /**
  347. * Asynchronously calls the Reveal.js API of the main frame.
  348. */
  349. function callRevealApi( methodName, methodArguments, callback ) {
  350. var callId = ++lastRevealApiCallId;
  351. pendingCalls[callId] = callback;
  352. window.opener.postMessage( JSON.stringify( {
  353. namespace: 'reveal-notes',
  354. type: 'call',
  355. callId: callId,
  356. methodName: methodName,
  357. arguments: methodArguments
  358. } ), '*' );
  359. }
  360. /**
  361. * Called when the main window is trying to establish a
  362. * connection.
  363. */
  364. function handleConnectMessage( data ) {
  365. if( connected === false ) {
  366. connected = true;
  367. setupIframes( data );
  368. setupKeyboard();
  369. setupNotes();
  370. setupTimer();
  371. setupHeartbeat();
  372. }
  373. }
  374. /**
  375. * Called when the main window sends an updated state.
  376. */
  377. function handleStateMessage( data ) {
  378. // Store the most recently set state to avoid circular loops
  379. // applying the same state
  380. currentState = JSON.stringify( data.state );
  381. // No need for updating the notes in case of fragment changes
  382. if ( data.notes ) {
  383. notes.classList.remove( 'hidden' );
  384. notesValue.style.whiteSpace = data.whitespace;
  385. if( data.markdown ) {
  386. notesValue.innerHTML = marked( data.notes );
  387. }
  388. else {
  389. notesValue.innerHTML = data.notes;
  390. }
  391. }
  392. else {
  393. notes.classList.add( 'hidden' );
  394. }
  395. // Update the note slides
  396. currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
  397. upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
  398. upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'next' }), '*' );
  399. }
  400. // Limit to max one state update per X ms
  401. handleStateMessage = debounce( handleStateMessage, 200 );
  402. /**
  403. * Forward keyboard events to the current slide window.
  404. * This enables keyboard events to work even if focus
  405. * isn't set on the current slide iframe.
  406. *
  407. * Block F5 default handling, it reloads and disconnects
  408. * the speaker notes window.
  409. */
  410. function setupKeyboard() {
  411. document.addEventListener( 'keydown', function( event ) {
  412. if( event.keyCode === 116 || ( event.metaKey && event.keyCode === 82 ) ) {
  413. event.preventDefault();
  414. return false;
  415. }
  416. currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
  417. } );
  418. }
  419. /**
  420. * Creates the preview iframes.
  421. */
  422. function setupIframes( data ) {
  423. var params = [
  424. 'receiver',
  425. 'progress=false',
  426. 'history=false',
  427. 'transition=none',
  428. 'autoSlide=0',
  429. 'backgroundTransition=none'
  430. ].join( '&' );
  431. var urlSeparator = /\?/.test(data.url) ? '&' : '?';
  432. var hash = '#/' + data.state.indexh + '/' + data.state.indexv;
  433. var currentURL = data.url + urlSeparator + params + '&postMessageEvents=true' + hash;
  434. var upcomingURL = data.url + urlSeparator + params + '&controls=false' + hash;
  435. currentSlide = document.createElement( 'iframe' );
  436. currentSlide.setAttribute( 'width', 1280 );
  437. currentSlide.setAttribute( 'height', 1024 );
  438. currentSlide.setAttribute( 'src', currentURL );
  439. document.querySelector( '#current-slide' ).appendChild( currentSlide );
  440. upcomingSlide = document.createElement( 'iframe' );
  441. upcomingSlide.setAttribute( 'width', 640 );
  442. upcomingSlide.setAttribute( 'height', 512 );
  443. upcomingSlide.setAttribute( 'src', upcomingURL );
  444. document.querySelector( '#upcoming-slide' ).appendChild( upcomingSlide );
  445. }
  446. /**
  447. * Setup the notes UI.
  448. */
  449. function setupNotes() {
  450. notes = document.querySelector( '.speaker-controls-notes' );
  451. notesValue = document.querySelector( '.speaker-controls-notes .value' );
  452. }
  453. /**
  454. * We send out a heartbeat at all times to ensure we can
  455. * reconnect with the main presentation window after reloads.
  456. */
  457. function setupHeartbeat() {
  458. setInterval( () => {
  459. window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'heartbeat'} ), '*' );
  460. }, 1000 );
  461. }
  462. function getTimings( callback ) {
  463. callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
  464. callRevealApi( 'getConfig', [], function ( config ) {
  465. var totalTime = config.totalTime;
  466. var minTimePerSlide = config.minimumTimePerSlide || 0;
  467. var defaultTiming = config.defaultTiming;
  468. if ((defaultTiming == null) && (totalTime == null)) {
  469. callback(null);
  470. return;
  471. }
  472. // Setting totalTime overrides defaultTiming
  473. if (totalTime) {
  474. defaultTiming = 0;
  475. }
  476. var timings = [];
  477. for ( var i in slideAttributes ) {
  478. var slide = slideAttributes[ i ];
  479. var timing = defaultTiming;
  480. if( slide.hasOwnProperty( 'data-timing' )) {
  481. var t = slide[ 'data-timing' ];
  482. timing = parseInt(t);
  483. if( isNaN(timing) ) {
  484. console.warn("Could not parse timing '" + t + "' of slide " + i + "; using default of " + defaultTiming);
  485. timing = defaultTiming;
  486. }
  487. }
  488. timings.push(timing);
  489. }
  490. if ( totalTime ) {
  491. // After we've allocated time to individual slides, we summarize it and
  492. // subtract it from the total time
  493. var remainingTime = totalTime - timings.reduce( function(a, b) { return a + b; }, 0 );
  494. // The remaining time is divided by the number of slides that have 0 seconds
  495. // allocated at the moment, giving the average time-per-slide on the remaining slides
  496. var remainingSlides = (timings.filter( function(x) { return x == 0 }) ).length
  497. var timePerSlide = Math.round( remainingTime / remainingSlides, 0 )
  498. // And now we replace every zero-value timing with that average
  499. timings = timings.map( function(x) { return (x==0 ? timePerSlide : x) } );
  500. }
  501. var slidesUnderMinimum = timings.filter( function(x) { return (x < minTimePerSlide) } ).length
  502. if ( slidesUnderMinimum ) {
  503. message = "The pacing time for " + slidesUnderMinimum + " slide(s) is under the configured minimum of " + minTimePerSlide + " seconds. Check the data-timing attribute on individual slides, or consider increasing the totalTime or minimumTimePerSlide configuration options (or removing some slides).";
  504. alert(message);
  505. }
  506. callback( timings );
  507. } );
  508. } );
  509. }
  510. /**
  511. * Return the number of seconds allocated for presenting
  512. * all slides up to and including this one.
  513. */
  514. function getTimeAllocated( timings, callback ) {
  515. callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
  516. var allocated = 0;
  517. for (var i in timings.slice(0, currentSlide + 1)) {
  518. allocated += timings[i];
  519. }
  520. callback( allocated );
  521. } );
  522. }
  523. /**
  524. * Create the timer and clock and start updating them
  525. * at an interval.
  526. */
  527. function setupTimer() {
  528. var start = new Date(),
  529. timeEl = document.querySelector( '.speaker-controls-time' ),
  530. clockEl = timeEl.querySelector( '.clock-value' ),
  531. hoursEl = timeEl.querySelector( '.hours-value' ),
  532. minutesEl = timeEl.querySelector( '.minutes-value' ),
  533. secondsEl = timeEl.querySelector( '.seconds-value' ),
  534. pacingTitleEl = timeEl.querySelector( '.pacing-title' ),
  535. pacingEl = timeEl.querySelector( '.pacing' ),
  536. pacingHoursEl = pacingEl.querySelector( '.hours-value' ),
  537. pacingMinutesEl = pacingEl.querySelector( '.minutes-value' ),
  538. pacingSecondsEl = pacingEl.querySelector( '.seconds-value' );
  539. var timings = null;
  540. getTimings( function ( _timings ) {
  541. timings = _timings;
  542. if (_timings !== null) {
  543. pacingTitleEl.style.removeProperty('display');
  544. pacingEl.style.removeProperty('display');
  545. }
  546. // Update once directly
  547. _updateTimer();
  548. // Then update every second
  549. setInterval( _updateTimer, 1000 );
  550. } );
  551. function _resetTimer() {
  552. if (timings == null) {
  553. start = new Date();
  554. _updateTimer();
  555. }
  556. else {
  557. // Reset timer to beginning of current slide
  558. getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
  559. var slideEndTiming = slideEndTimingSeconds * 1000;
  560. callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
  561. var currentSlideTiming = timings[currentSlide] * 1000;
  562. var previousSlidesTiming = slideEndTiming - currentSlideTiming;
  563. var now = new Date();
  564. start = new Date(now.getTime() - previousSlidesTiming);
  565. _updateTimer();
  566. } );
  567. } );
  568. }
  569. }
  570. timeEl.addEventListener( 'click', function() {
  571. _resetTimer();
  572. return false;
  573. } );
  574. function _displayTime( hrEl, minEl, secEl, time) {
  575. var sign = Math.sign(time) == -1 ? "-" : "";
  576. time = Math.abs(Math.round(time / 1000));
  577. var seconds = time % 60;
  578. var minutes = Math.floor( time / 60 ) % 60 ;
  579. var hours = Math.floor( time / ( 60 * 60 )) ;
  580. hrEl.innerHTML = sign + zeroPadInteger( hours );
  581. if (hours == 0) {
  582. hrEl.classList.add( 'mute' );
  583. }
  584. else {
  585. hrEl.classList.remove( 'mute' );
  586. }
  587. minEl.innerHTML = ':' + zeroPadInteger( minutes );
  588. if (hours == 0 && minutes == 0) {
  589. minEl.classList.add( 'mute' );
  590. }
  591. else {
  592. minEl.classList.remove( 'mute' );
  593. }
  594. secEl.innerHTML = ':' + zeroPadInteger( seconds );
  595. }
  596. function _updateTimer() {
  597. var diff, hours, minutes, seconds,
  598. now = new Date();
  599. diff = now.getTime() - start.getTime();
  600. clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
  601. _displayTime( hoursEl, minutesEl, secondsEl, diff );
  602. if (timings !== null) {
  603. _updatePacing(diff);
  604. }
  605. }
  606. function _updatePacing(diff) {
  607. getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
  608. var slideEndTiming = slideEndTimingSeconds * 1000;
  609. callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
  610. var currentSlideTiming = timings[currentSlide] * 1000;
  611. var timeLeftCurrentSlide = slideEndTiming - diff;
  612. if (timeLeftCurrentSlide < 0) {
  613. pacingEl.className = 'pacing behind';
  614. }
  615. else if (timeLeftCurrentSlide < currentSlideTiming) {
  616. pacingEl.className = 'pacing on-track';
  617. }
  618. else {
  619. pacingEl.className = 'pacing ahead';
  620. }
  621. _displayTime( pacingHoursEl, pacingMinutesEl, pacingSecondsEl, timeLeftCurrentSlide );
  622. } );
  623. } );
  624. }
  625. }
  626. /**
  627. * Sets up the speaker view layout and layout selector.
  628. */
  629. function setupLayout() {
  630. layoutDropdown = document.querySelector( '.speaker-layout-dropdown' );
  631. layoutLabel = document.querySelector( '.speaker-layout-label' );
  632. // Render the list of available layouts
  633. for( var id in SPEAKER_LAYOUTS ) {
  634. var option = document.createElement( 'option' );
  635. option.setAttribute( 'value', id );
  636. option.textContent = SPEAKER_LAYOUTS[ id ];
  637. layoutDropdown.appendChild( option );
  638. }
  639. // Monitor the dropdown for changes
  640. layoutDropdown.addEventListener( 'change', function( event ) {
  641. setLayout( layoutDropdown.value );
  642. }, false );
  643. // Restore any currently persisted layout
  644. setLayout( getLayout() );
  645. }
  646. /**
  647. * Sets a new speaker view layout. The layout is persisted
  648. * in local storage.
  649. */
  650. function setLayout( value ) {
  651. var title = SPEAKER_LAYOUTS[ value ];
  652. layoutLabel.innerHTML = 'Layout' + ( title ? ( ': ' + title ) : '' );
  653. layoutDropdown.value = value;
  654. document.body.setAttribute( 'data-speaker-layout', value );
  655. // Persist locally
  656. if( supportsLocalStorage() ) {
  657. window.localStorage.setItem( 'reveal-speaker-layout', value );
  658. }
  659. }
  660. /**
  661. * Returns the ID of the most recently set speaker layout
  662. * or our default layout if none has been set.
  663. */
  664. function getLayout() {
  665. if( supportsLocalStorage() ) {
  666. var layout = window.localStorage.getItem( 'reveal-speaker-layout' );
  667. if( layout ) {
  668. return layout;
  669. }
  670. }
  671. // Default to the first record in the layouts hash
  672. for( var id in SPEAKER_LAYOUTS ) {
  673. return id;
  674. }
  675. }
  676. function supportsLocalStorage() {
  677. try {
  678. localStorage.setItem('test', 'test');
  679. localStorage.removeItem('test');
  680. return true;
  681. }
  682. catch( e ) {
  683. return false;
  684. }
  685. }
  686. function zeroPadInteger( num ) {
  687. var str = '00' + parseInt( num );
  688. return str.substring( str.length - 2 );
  689. }
  690. /**
  691. * Limits the frequency at which a function can be called.
  692. */
  693. function debounce( fn, ms ) {
  694. var lastTime = 0,
  695. timeout;
  696. return function() {
  697. var args = arguments;
  698. var context = this;
  699. clearTimeout( timeout );
  700. var timeSinceLastCall = Date.now() - lastTime;
  701. if( timeSinceLastCall > ms ) {
  702. fn.apply( context, args );
  703. lastTime = Date.now();
  704. }
  705. else {
  706. timeout = setTimeout( function() {
  707. fn.apply( context, args );
  708. lastTime = Date.now();
  709. }, ms - timeSinceLastCall );
  710. }
  711. }
  712. }
  713. })();
  714. </script>
  715. </body>
  716. </html>