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korap.ids-mannheim.de / IDS-Mannheim / revealjs / 9c036a424c275bbeebd43ac872361864546602ac / . / inst / reveal.js-5.1.0 / plugin / notes / speaker-view.html
blob: 55bc01f4353922b8089d24f85bbb3f93201628c5 [file] [log] [blame]
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]1<!--
2 NOTE: You need to build the notes plugin after making changes to this file.
3-->
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]4<html lang="en">
5 <head>
6 <meta charset="utf-8">
7
8 <title>reveal.js - Speaker View</title>
9
10 <style>
11 body {
12 font-family: Helvetica;
13 font-size: 18px;
14 }
15
16 #current-slide,
17 #upcoming-slide,
18 #speaker-controls {
19 padding: 6px;
20 box-sizing: border-box;
21 -moz-box-sizing: border-box;
22 }
23
24 #current-slide iframe,
25 #upcoming-slide iframe {
26 width: 100%;
27 height: 100%;
28 border: 1px solid #ddd;
29 }
30
31 #current-slide .label,
32 #upcoming-slide .label {
33 position: absolute;
34 top: 10px;
35 left: 10px;
36 z-index: 2;
37 }
38
39 #connection-status {
40 position: absolute;
41 top: 0;
42 left: 0;
43 width: 100%;
44 height: 100%;
45 z-index: 20;
46 padding: 30% 20% 20% 20%;
47 font-size: 18px;
48 color: #222;
49 background: #fff;
50 text-align: center;
51 box-sizing: border-box;
52 line-height: 1.4;
53 }
54
55 .overlay-element {
56 height: 34px;
57 line-height: 34px;
58 padding: 0 10px;
59 text-shadow: none;
60 background: rgba( 220, 220, 220, 0.8 );
61 color: #222;
62 font-size: 14px;
63 }
64
65 .overlay-element.interactive:hover {
66 background: rgba( 220, 220, 220, 1 );
67 }
68
69 #current-slide {
70 position: absolute;
71 width: 60%;
72 height: 100%;
73 top: 0;
74 left: 0;
75 padding-right: 0;
76 }
77
78 #upcoming-slide {
79 position: absolute;
80 width: 40%;
81 height: 40%;
82 right: 0;
83 top: 0;
84 }
85
86 /* Speaker controls */
87 #speaker-controls {
88 position: absolute;
89 top: 40%;
90 right: 0;
91 width: 40%;
92 height: 60%;
93 overflow: auto;
94 font-size: 18px;
95 }
96
97 .speaker-controls-time.hidden,
98 .speaker-controls-notes.hidden {
99 display: none;
100 }
101
102 .speaker-controls-time .label,
103 .speaker-controls-pace .label,
104 .speaker-controls-notes .label {
105 text-transform: uppercase;
106 font-weight: normal;
107 font-size: 0.66em;
108 color: #666;
109 margin: 0;
110 }
111
112 .speaker-controls-time, .speaker-controls-pace {
113 border-bottom: 1px solid rgba( 200, 200, 200, 0.5 );
114 margin-bottom: 10px;
115 padding: 10px 16px;
116 padding-bottom: 20px;
117 cursor: pointer;
118 }
119
120 .speaker-controls-time .reset-button {
121 opacity: 0;
122 float: right;
123 color: #666;
124 text-decoration: none;
125 }
126 .speaker-controls-time:hover .reset-button {
127 opacity: 1;
128 }
129
130 .speaker-controls-time .timer,
131 .speaker-controls-time .clock {
132 width: 50%;
133 }
134
135 .speaker-controls-time .timer,
136 .speaker-controls-time .clock,
137 .speaker-controls-time .pacing .hours-value,
138 .speaker-controls-time .pacing .minutes-value,
139 .speaker-controls-time .pacing .seconds-value {
140 font-size: 1.9em;
141 }
142
143 .speaker-controls-time .timer {
144 float: left;
145 }
146
147 .speaker-controls-time .clock {
148 float: right;
149 text-align: right;
150 }
151
152 .speaker-controls-time span.mute {
153 opacity: 0.3;
154 }
155
156 .speaker-controls-time .pacing-title {
157 margin-top: 5px;
158 }
159
160 .speaker-controls-time .pacing.ahead {
161 color: blue;
162 }
163
164 .speaker-controls-time .pacing.on-track {
165 color: green;
166 }
167
168 .speaker-controls-time .pacing.behind {
169 color: red;
170 }
171
172 .speaker-controls-notes {
173 padding: 10px 16px;
174 }
175
176 .speaker-controls-notes .value {
177 margin-top: 5px;
178 line-height: 1.4;
179 font-size: 1.2em;
180 }
181
182 /* Layout selector */
183 #speaker-layout {
184 position: absolute;
185 top: 10px;
186 right: 10px;
187 color: #222;
188 z-index: 10;
189 }
190 #speaker-layout select {
191 position: absolute;
192 width: 100%;
193 height: 100%;
194 top: 0;
195 left: 0;
196 border: 0;
197 box-shadow: 0;
198 cursor: pointer;
199 opacity: 0;
200
201 font-size: 1em;
202 background-color: transparent;
203
204 -moz-appearance: none;
205 -webkit-appearance: none;
206 -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
207 }
208
209 #speaker-layout select:focus {
210 outline: none;
211 box-shadow: none;
212 }
213
214 .clear {
215 clear: both;
216 }
217
218 /* Speaker layout: Wide */
219 body[data-speaker-layout="wide"] #current-slide,
220 body[data-speaker-layout="wide"] #upcoming-slide {
221 width: 50%;
222 height: 45%;
223 padding: 6px;
224 }
225
226 body[data-speaker-layout="wide"] #current-slide {
227 top: 0;
228 left: 0;
229 }
230
231 body[data-speaker-layout="wide"] #upcoming-slide {
232 top: 0;
233 left: 50%;
234 }
235
236 body[data-speaker-layout="wide"] #speaker-controls {
237 top: 45%;
238 left: 0;
239 width: 100%;
240 height: 50%;
241 font-size: 1.25em;
242 }
243
244 /* Speaker layout: Tall */
245 body[data-speaker-layout="tall"] #current-slide,
246 body[data-speaker-layout="tall"] #upcoming-slide {
247 width: 45%;
248 height: 50%;
249 padding: 6px;
250 }
251
252 body[data-speaker-layout="tall"] #current-slide {
253 top: 0;
254 left: 0;
255 }
256
257 body[data-speaker-layout="tall"] #upcoming-slide {
258 top: 50%;
259 left: 0;
260 }
261
262 body[data-speaker-layout="tall"] #speaker-controls {
263 padding-top: 40px;
264 top: 0;
265 left: 45%;
266 width: 55%;
267 height: 100%;
268 font-size: 1.25em;
269 }
270
271 /* Speaker layout: Notes only */
272 body[data-speaker-layout="notes-only"] #current-slide,
273 body[data-speaker-layout="notes-only"] #upcoming-slide {
274 display: none;
275 }
276
277 body[data-speaker-layout="notes-only"] #speaker-controls {
278 padding-top: 40px;
279 top: 0;
280 left: 0;
281 width: 100%;
282 height: 100%;
283 font-size: 1.25em;
284 }
285
286 @media screen and (max-width: 1080px) {
287 body[data-speaker-layout="default"] #speaker-controls {
288 font-size: 16px;
289 }
290 }
291
292 @media screen and (max-width: 900px) {
293 body[data-speaker-layout="default"] #speaker-controls {
294 font-size: 14px;
295 }
296 }
297
298 @media screen and (max-width: 800px) {
299 body[data-speaker-layout="default"] #speaker-controls {
300 font-size: 12px;
301 }
302 }
303
304 </style>
305 </head>
306
307 <body>
308
309 <div id="connection-status">Loading speaker view...</div>
310
311 <div id="current-slide"></div>
312 <div id="upcoming-slide"><span class="overlay-element label">Upcoming</span></div>
313 <div id="speaker-controls">
314 <div class="speaker-controls-time">
315 <h4 class="label">Time <span class="reset-button">Click to Reset</span></h4>
316 <div class="clock">
317 <span class="clock-value">0:00 AM</span>
318 </div>
319 <div class="timer">
320 <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
321 </div>
322 <div class="clear"></div>
323
324 <h4 class="label pacing-title" style="display: none">Pacing – Time to finish current slide</h4>
325 <div class="pacing" style="display: none">
326 <span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
327 </div>
328 </div>
329
330 <div class="speaker-controls-notes hidden">
331 <h4 class="label">Notes</h4>
332 <div class="value"></div>
333 </div>
334 </div>
335 <div id="speaker-layout" class="overlay-element interactive">
336 <span class="speaker-layout-label"></span>
337 <select class="speaker-layout-dropdown"></select>
338 </div>
339
340 <script>
341
342 (function() {
343
344 var notes,
345 notesValue,
346 currentState,
347 currentSlide,
348 upcomingSlide,
349 layoutLabel,
350 layoutDropdown,
351 pendingCalls = {},
352 lastRevealApiCallId = 0,
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]353 connected = false
354
355 var connectionStatus = document.querySelector( '#connection-status' );
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]356
357 var SPEAKER_LAYOUTS = {
358 'default': 'Default',
359 'wide': 'Wide',
360 'tall': 'Tall',
361 'notes-only': 'Notes only'
362 };
363
364 setupLayout();
365
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]366 let openerOrigin;
367
368 try {
369 openerOrigin = window.opener.location.origin;
370 }
371 catch ( error ) { console.warn( error ) }
372
373 // In order to prevent XSS, the speaker view will only run if its
374 // opener has the same origin as itself
375 if( window.location.origin !== openerOrigin ) {
376 connectionStatus.innerHTML = 'Cross origin error.<br>The speaker window can only be opened from the same origin.';
377 return;
378 }
379
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]380 var connectionTimeout = setTimeout( function() {
381 connectionStatus.innerHTML = 'Error connecting to main window.<br>Please try closing and reopening the speaker view.';
382 }, 5000 );
383
384 window.addEventListener( 'message', function( event ) {
385
Marc Kupietz9c036a42024-05-14 13:17:25 +0200[diff] [blame^]386 // Validate the origin of all messages to avoid parsing messages
387 // that aren't meant for us. Ignore when running off file:// so
388 // that the speaker view continues to work without a web server.
389 if( window.location.origin !== event.origin && window.location.origin !== 'file://' ) {
390 return
391 }
392
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]393 clearTimeout( connectionTimeout );
394 connectionStatus.style.display = 'none';
395
396 var data = JSON.parse( event.data );
397
398 // The overview mode is only useful to the reveal.js instance
399 // where navigation occurs so we don't sync it
400 if( data.state ) delete data.state.overview;
401
402 // Messages sent by the notes plugin inside of the main window
403 if( data && data.namespace === 'reveal-notes' ) {
404 if( data.type === 'connect' ) {
405 handleConnectMessage( data );
406 }
407 else if( data.type === 'state' ) {
408 handleStateMessage( data );
409 }
410 else if( data.type === 'return' ) {
411 pendingCalls[data.callId](data.result);
412 delete pendingCalls[data.callId];
413 }
414 }
415 // Messages sent by the reveal.js inside of the current slide preview
416 else if( data && data.namespace === 'reveal' ) {
417 if( /ready/.test( data.eventName ) ) {
418 // Send a message back to notify that the handshake is complete
419 window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'connected'} ), '*' );
420 }
421 else if( /slidechanged|fragmentshown|fragmenthidden|paused|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {
422
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]423 dispatchStateToMainWindow( data.state );
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]424
425 }
426 }
427
428 } );
429
430 /**
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]431 * Updates the presentation in the main window to match the state
432 * of the presentation in the notes window.
433 */
434 const dispatchStateToMainWindow = debounce(( state ) => {
435 window.opener.postMessage( JSON.stringify({ method: 'setState', args: [ state ]} ), '*' );
436 }, 500);
437
438 /**
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]439 * Asynchronously calls the Reveal.js API of the main frame.
440 */
441 function callRevealApi( methodName, methodArguments, callback ) {
442
443 var callId = ++lastRevealApiCallId;
444 pendingCalls[callId] = callback;
445 window.opener.postMessage( JSON.stringify( {
446 namespace: 'reveal-notes',
447 type: 'call',
448 callId: callId,
449 methodName: methodName,
450 arguments: methodArguments
451 } ), '*' );
452
453 }
454
455 /**
456 * Called when the main window is trying to establish a
457 * connection.
458 */
459 function handleConnectMessage( data ) {
460
461 if( connected === false ) {
462 connected = true;
463
464 setupIframes( data );
465 setupKeyboard();
466 setupNotes();
467 setupTimer();
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]468 setupHeartbeat();
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]469 }
470
471 }
472
473 /**
474 * Called when the main window sends an updated state.
475 */
476 function handleStateMessage( data ) {
477
478 // Store the most recently set state to avoid circular loops
479 // applying the same state
480 currentState = JSON.stringify( data.state );
481
482 // No need for updating the notes in case of fragment changes
483 if ( data.notes ) {
484 notes.classList.remove( 'hidden' );
485 notesValue.style.whiteSpace = data.whitespace;
486 if( data.markdown ) {
487 notesValue.innerHTML = marked( data.notes );
488 }
489 else {
490 notesValue.innerHTML = data.notes;
491 }
492 }
493 else {
494 notes.classList.add( 'hidden' );
495 }
496
497 // Update the note slides
498 currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
499 upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
500 upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'next' }), '*' );
501
502 }
503
504 // Limit to max one state update per X ms
505 handleStateMessage = debounce( handleStateMessage, 200 );
506
507 /**
508 * Forward keyboard events to the current slide window.
509 * This enables keyboard events to work even if focus
510 * isn't set on the current slide iframe.
511 *
512 * Block F5 default handling, it reloads and disconnects
513 * the speaker notes window.
514 */
515 function setupKeyboard() {
516
517 document.addEventListener( 'keydown', function( event ) {
518 if( event.keyCode === 116 || ( event.metaKey && event.keyCode === 82 ) ) {
519 event.preventDefault();
520 return false;
521 }
522 currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
523 } );
524
525 }
526
527 /**
528 * Creates the preview iframes.
529 */
530 function setupIframes( data ) {
531
532 var params = [
533 'receiver',
534 'progress=false',
535 'history=false',
536 'transition=none',
537 'autoSlide=0',
538 'backgroundTransition=none'
539 ].join( '&' );
540
541 var urlSeparator = /\?/.test(data.url) ? '&' : '?';
542 var hash = '#/' + data.state.indexh + '/' + data.state.indexv;
Marc Kupietz9c036a42024-05-14 13:17:25 +0200[diff] [blame^]543 var currentURL = data.url + urlSeparator + params + '&scrollActivationWidth=false&postMessageEvents=true' + hash;
544 var upcomingURL = data.url + urlSeparator + params + '&scrollActivationWidth=false&controls=false' + hash;
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]545
546 currentSlide = document.createElement( 'iframe' );
547 currentSlide.setAttribute( 'width', 1280 );
548 currentSlide.setAttribute( 'height', 1024 );
549 currentSlide.setAttribute( 'src', currentURL );
550 document.querySelector( '#current-slide' ).appendChild( currentSlide );
551
552 upcomingSlide = document.createElement( 'iframe' );
553 upcomingSlide.setAttribute( 'width', 640 );
554 upcomingSlide.setAttribute( 'height', 512 );
555 upcomingSlide.setAttribute( 'src', upcomingURL );
556 document.querySelector( '#upcoming-slide' ).appendChild( upcomingSlide );
557
558 }
559
560 /**
561 * Setup the notes UI.
562 */
563 function setupNotes() {
564
565 notes = document.querySelector( '.speaker-controls-notes' );
566 notesValue = document.querySelector( '.speaker-controls-notes .value' );
567
568 }
569
Marc Kupietz09b75752023-10-07 09:32:19 +0200[diff] [blame]570 /**
571 * We send out a heartbeat at all times to ensure we can
572 * reconnect with the main presentation window after reloads.
573 */
574 function setupHeartbeat() {
575
576 setInterval( () => {
577 window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'heartbeat'} ), '*' );
578 }, 1000 );
579
580 }
581
Christophe Dervieuxe1893ae2021-10-07 17:09:02 +0200[diff] [blame]582 function getTimings( callback ) {
583
584 callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
585 callRevealApi( 'getConfig', [], function ( config ) {
586 var totalTime = config.totalTime;
587 var minTimePerSlide = config.minimumTimePerSlide || 0;
588 var defaultTiming = config.defaultTiming;
589 if ((defaultTiming == null) && (totalTime == null)) {
590 callback(null);
591 return;
592 }
593 // Setting totalTime overrides defaultTiming
594 if (totalTime) {
595 defaultTiming = 0;
596 }
597 var timings = [];
598 for ( var i in slideAttributes ) {
599 var slide = slideAttributes[ i ];
600 var timing = defaultTiming;
601 if( slide.hasOwnProperty( 'data-timing' )) {
602 var t = slide[ 'data-timing' ];
603 timing = parseInt(t);
604 if( isNaN(timing) ) {
605 console.warn("Could not parse timing '" + t + "' of slide " + i + "; using default of " + defaultTiming);
606 timing = defaultTiming;
607 }
608 }
609 timings.push(timing);
610 }
611 if ( totalTime ) {
612 // After we've allocated time to individual slides, we summarize it and
613 // subtract it from the total time
614 var remainingTime = totalTime - timings.reduce( function(a, b) { return a + b; }, 0 );
615 // The remaining time is divided by the number of slides that have 0 seconds
616 // allocated at the moment, giving the average time-per-slide on the remaining slides
617 var remainingSlides = (timings.filter( function(x) { return x == 0 }) ).length
618 var timePerSlide = Math.round( remainingTime / remainingSlides, 0 )
619 // And now we replace every zero-value timing with that average
620 timings = timings.map( function(x) { return (x==0 ? timePerSlide : x) } );
621 }
622 var slidesUnderMinimum = timings.filter( function(x) { return (x < minTimePerSlide) } ).length
623 if ( slidesUnderMinimum ) {
624 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).";
625 alert(message);
626 }
627 callback( timings );
628 } );
629 } );
630
631 }
632
633 /**
634 * Return the number of seconds allocated for presenting
635 * all slides up to and including this one.
636 */
637 function getTimeAllocated( timings, callback ) {
638
639 callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
640 var allocated = 0;
641 for (var i in timings.slice(0, currentSlide + 1)) {
642 allocated += timings[i];
643 }
644 callback( allocated );
645 } );
646
647 }
648
649 /**
650 * Create the timer and clock and start updating them
651 * at an interval.
652 */
653 function setupTimer() {
654
655 var start = new Date(),
656 timeEl = document.querySelector( '.speaker-controls-time' ),
657 clockEl = timeEl.querySelector( '.clock-value' ),
658 hoursEl = timeEl.querySelector( '.hours-value' ),
659 minutesEl = timeEl.querySelector( '.minutes-value' ),
660 secondsEl = timeEl.querySelector( '.seconds-value' ),
661 pacingTitleEl = timeEl.querySelector( '.pacing-title' ),
662 pacingEl = timeEl.querySelector( '.pacing' ),
663 pacingHoursEl = pacingEl.querySelector( '.hours-value' ),
664 pacingMinutesEl = pacingEl.querySelector( '.minutes-value' ),
665 pacingSecondsEl = pacingEl.querySelector( '.seconds-value' );
666
667 var timings = null;
668 getTimings( function ( _timings ) {
669
670 timings = _timings;
671 if (_timings !== null) {
672 pacingTitleEl.style.removeProperty('display');
673 pacingEl.style.removeProperty('display');
674 }
675
676 // Update once directly
677 _updateTimer();
678
679 // Then update every second
680 setInterval( _updateTimer, 1000 );
681
682 } );
683
684
685 function _resetTimer() {
686
687 if (timings == null) {
688 start = new Date();
689 _updateTimer();
690 }
691 else {
692 // Reset timer to beginning of current slide
693 getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
694 var slideEndTiming = slideEndTimingSeconds * 1000;
695 callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
696 var currentSlideTiming = timings[currentSlide] * 1000;
697 var previousSlidesTiming = slideEndTiming - currentSlideTiming;
698 var now = new Date();
699 start = new Date(now.getTime() - previousSlidesTiming);
700 _updateTimer();
701 } );
702 } );
703 }
704
705 }
706
707 timeEl.addEventListener( 'click', function() {
708 _resetTimer();
709 return false;
710 } );
711
712 function _displayTime( hrEl, minEl, secEl, time) {
713
714 var sign = Math.sign(time) == -1 ? "-" : "";
715 time = Math.abs(Math.round(time / 1000));
716 var seconds = time % 60;
717 var minutes = Math.floor( time / 60 ) % 60 ;
718 var hours = Math.floor( time / ( 60 * 60 )) ;
719 hrEl.innerHTML = sign + zeroPadInteger( hours );
720 if (hours == 0) {
721 hrEl.classList.add( 'mute' );
722 }
723 else {
724 hrEl.classList.remove( 'mute' );
725 }
726 minEl.innerHTML = ':' + zeroPadInteger( minutes );
727 if (hours == 0 && minutes == 0) {
728 minEl.classList.add( 'mute' );
729 }
730 else {
731 minEl.classList.remove( 'mute' );
732 }
733 secEl.innerHTML = ':' + zeroPadInteger( seconds );
734 }
735
736 function _updateTimer() {
737
738 var diff, hours, minutes, seconds,
739 now = new Date();
740
741 diff = now.getTime() - start.getTime();
742
743 clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
744 _displayTime( hoursEl, minutesEl, secondsEl, diff );
745 if (timings !== null) {
746 _updatePacing(diff);
747 }
748
749 }
750
751 function _updatePacing(diff) {
752
753 getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
754 var slideEndTiming = slideEndTimingSeconds * 1000;
755
756 callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
757 var currentSlideTiming = timings[currentSlide] * 1000;
758 var timeLeftCurrentSlide = slideEndTiming - diff;
759 if (timeLeftCurrentSlide < 0) {
760 pacingEl.className = 'pacing behind';
761 }
762 else if (timeLeftCurrentSlide < currentSlideTiming) {
763 pacingEl.className = 'pacing on-track';
764 }
765 else {
766 pacingEl.className = 'pacing ahead';
767 }
768 _displayTime( pacingHoursEl, pacingMinutesEl, pacingSecondsEl, timeLeftCurrentSlide );
769 } );
770 } );
771 }
772
773 }
774
775 /**
776 * Sets up the speaker view layout and layout selector.
777 */
778 function setupLayout() {
779
780 layoutDropdown = document.querySelector( '.speaker-layout-dropdown' );
781 layoutLabel = document.querySelector( '.speaker-layout-label' );
782
783 // Render the list of available layouts
784 for( var id in SPEAKER_LAYOUTS ) {
785 var option = document.createElement( 'option' );
786 option.setAttribute( 'value', id );
787 option.textContent = SPEAKER_LAYOUTS[ id ];
788 layoutDropdown.appendChild( option );
789 }
790
791 // Monitor the dropdown for changes
792 layoutDropdown.addEventListener( 'change', function( event ) {
793
794 setLayout( layoutDropdown.value );
795
796 }, false );
797
798 // Restore any currently persisted layout
799 setLayout( getLayout() );
800
801 }
802
803 /**
804 * Sets a new speaker view layout. The layout is persisted
805 * in local storage.
806 */
807 function setLayout( value ) {
808
809 var title = SPEAKER_LAYOUTS[ value ];
810
811 layoutLabel.innerHTML = 'Layout' + ( title ? ( ': ' + title ) : '' );
812 layoutDropdown.value = value;
813
814 document.body.setAttribute( 'data-speaker-layout', value );
815
816 // Persist locally
817 if( supportsLocalStorage() ) {
818 window.localStorage.setItem( 'reveal-speaker-layout', value );
819 }
820
821 }
822
823 /**
824 * Returns the ID of the most recently set speaker layout
825 * or our default layout if none has been set.
826 */
827 function getLayout() {
828
829 if( supportsLocalStorage() ) {
830 var layout = window.localStorage.getItem( 'reveal-speaker-layout' );
831 if( layout ) {
832 return layout;
833 }
834 }
835
836 // Default to the first record in the layouts hash
837 for( var id in SPEAKER_LAYOUTS ) {
838 return id;
839 }
840
841 }
842
843 function supportsLocalStorage() {
844
845 try {
846 localStorage.setItem('test', 'test');
847 localStorage.removeItem('test');
848 return true;
849 }
850 catch( e ) {
851 return false;
852 }
853
854 }
855
856 function zeroPadInteger( num ) {
857
858 var str = '00' + parseInt( num );
859 return str.substring( str.length - 2 );
860
861 }
862
863 /**
864 * Limits the frequency at which a function can be called.
865 */
866 function debounce( fn, ms ) {
867
868 var lastTime = 0,
869 timeout;
870
871 return function() {
872
873 var args = arguments;
874 var context = this;
875
876 clearTimeout( timeout );
877
878 var timeSinceLastCall = Date.now() - lastTime;
879 if( timeSinceLastCall > ms ) {
880 fn.apply( context, args );
881 lastTime = Date.now();
882 }
883 else {
884 timeout = setTimeout( function() {
885 fn.apply( context, args );
886 lastTime = Date.now();
887 }, ms - timeSinceLastCall );
888 }
889
890 }
891
892 }
893
894 })();
895
896 </script>
897 </body>
898</html>