inst/reveal.js-4.6.1/plugin/notes/speaker-view.html - IDS-Mannheim/revealjs - Gitiles

 <!--
 	NOTE: You need to build the notes plugin after making changes to this file.
 -->
 <html lang="en">
 	<head>
 		<meta charset="utf-8">

 		<title>reveal.js - Speaker View</title>

 		<style>
 			body {
 				font-family: Helvetica;
 				font-size: 18px;
 			}

 			#current-slide,
 			#upcoming-slide,
 			#speaker-controls {
 				padding: 6px;
 				box-sizing: border-box;
 				-moz-box-sizing: border-box;
 			}

 			#current-slide iframe,
 			#upcoming-slide iframe {
 				width: 100%;
 				height: 100%;
 				border: 1px solid #ddd;
 			}

 			#current-slide .label,
 			#upcoming-slide .label {
 				position: absolute;
 				top: 10px;
 				left: 10px;
 				z-index: 2;
 			}

 			#connection-status {
 				position: absolute;
 				top: 0;
 				left: 0;
 				width: 100%;
 				height: 100%;
 				z-index: 20;
 				padding: 30% 20% 20% 20%;
 				font-size: 18px;
 				color: #222;
 				background: #fff;
 				text-align: center;
 				box-sizing: border-box;
 				line-height: 1.4;
 			}

 			.overlay-element {
 				height: 34px;
 				line-height: 34px;
 				padding: 0 10px;
 				text-shadow: none;
 				background: rgba( 220, 220, 220, 0.8 );
 				color: #222;
 				font-size: 14px;
 			}

 			.overlay-element.interactive:hover {
 				background: rgba( 220, 220, 220, 1 );
 			}

 			#current-slide {
 				position: absolute;
 				width: 60%;
 				height: 100%;
 				top: 0;
 				left: 0;
 				padding-right: 0;
 			}

 			#upcoming-slide {
 				position: absolute;
 				width: 40%;
 				height: 40%;
 				right: 0;
 				top: 0;
 			}

 			/* Speaker controls */
 			#speaker-controls {
 				position: absolute;
 				top: 40%;
 				right: 0;
 				width: 40%;
 				height: 60%;
 				overflow: auto;
 				font-size: 18px;
 			}

 				.speaker-controls-time.hidden,
 				.speaker-controls-notes.hidden {
 					display: none;
 				}

 				.speaker-controls-time .label,
 				.speaker-controls-pace .label,
 				.speaker-controls-notes .label {
 					text-transform: uppercase;
 					font-weight: normal;
 					font-size: 0.66em;
 					color: #666;
 					margin: 0;
 				}

 				.speaker-controls-time, .speaker-controls-pace {
 					border-bottom: 1px solid rgba( 200, 200, 200, 0.5 );
 					margin-bottom: 10px;
 					padding: 10px 16px;
 					padding-bottom: 20px;
 					cursor: pointer;
 				}

 				.speaker-controls-time .reset-button {
 					opacity: 0;
 					float: right;
 					color: #666;
 					text-decoration: none;
 				}
 				.speaker-controls-time:hover .reset-button {
 					opacity: 1;
 				}

 				.speaker-controls-time .timer,
 				.speaker-controls-time .clock {
 					width: 50%;
 				}

 				.speaker-controls-time .timer,
 				.speaker-controls-time .clock,
 				.speaker-controls-time .pacing .hours-value,
 				.speaker-controls-time .pacing .minutes-value,
 				.speaker-controls-time .pacing .seconds-value {
 					font-size: 1.9em;
 				}

 				.speaker-controls-time .timer {
 					float: left;
 				}

 				.speaker-controls-time .clock {
 					float: right;
 					text-align: right;
 				}

 				.speaker-controls-time span.mute {
 					opacity: 0.3;
 				}

 				.speaker-controls-time .pacing-title {
 					margin-top: 5px;
 				}

 				.speaker-controls-time .pacing.ahead {
 					color: blue;
 				}

 				.speaker-controls-time .pacing.on-track {
 					color: green;
 				}

 				.speaker-controls-time .pacing.behind {
 					color: red;
 				}

 				.speaker-controls-notes {
 					padding: 10px 16px;
 				}

 				.speaker-controls-notes .value {
 					margin-top: 5px;
 					line-height: 1.4;
 					font-size: 1.2em;
 				}

 			/* Layout selector */
 			#speaker-layout {
 				position: absolute;
 				top: 10px;
 				right: 10px;
 				color: #222;
 				z-index: 10;
 			}
 				#speaker-layout select {
 					position: absolute;
 					width: 100%;
 					height: 100%;
 					top: 0;
 					left: 0;
 					border: 0;
 					box-shadow: 0;
 					cursor: pointer;
 					opacity: 0;

 					font-size: 1em;
 					background-color: transparent;

 					-moz-appearance: none;
 					-webkit-appearance: none;
 					-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
 				}

 				#speaker-layout select:focus {
 					outline: none;
 					box-shadow: none;
 				}

 			.clear {
 				clear: both;
 			}

 			/* Speaker layout: Wide */
 			body[data-speaker-layout="wide"] #current-slide,
 			body[data-speaker-layout="wide"] #upcoming-slide {
 				width: 50%;
 				height: 45%;
 				padding: 6px;
 			}

 			body[data-speaker-layout="wide"] #current-slide {
 				top: 0;
 				left: 0;
 			}

 			body[data-speaker-layout="wide"] #upcoming-slide {
 				top: 0;
 				left: 50%;
 			}

 			body[data-speaker-layout="wide"] #speaker-controls {
 				top: 45%;
 				left: 0;
 				width: 100%;
 				height: 50%;
 				font-size: 1.25em;
 			}

 			/* Speaker layout: Tall */
 			body[data-speaker-layout="tall"] #current-slide,
 			body[data-speaker-layout="tall"] #upcoming-slide {
 				width: 45%;
 				height: 50%;
 				padding: 6px;
 			}

 			body[data-speaker-layout="tall"] #current-slide {
 				top: 0;
 				left: 0;
 			}

 			body[data-speaker-layout="tall"] #upcoming-slide {
 				top: 50%;
 				left: 0;
 			}

 			body[data-speaker-layout="tall"] #speaker-controls {
 				padding-top: 40px;
 				top: 0;
 				left: 45%;
 				width: 55%;
 				height: 100%;
 				font-size: 1.25em;
 			}

 			/* Speaker layout: Notes only */
 			body[data-speaker-layout="notes-only"] #current-slide,
 			body[data-speaker-layout="notes-only"] #upcoming-slide {
 				display: none;
 			}

 			body[data-speaker-layout="notes-only"] #speaker-controls {
 				padding-top: 40px;
 				top: 0;
 				left: 0;
 				width: 100%;
 				height: 100%;
 				font-size: 1.25em;
 			}

 			@media screen and (max-width: 1080px) {
 				body[data-speaker-layout="default"] #speaker-controls {
 					font-size: 16px;
 				}
 			}

 			@media screen and (max-width: 900px) {
 				body[data-speaker-layout="default"] #speaker-controls {
 					font-size: 14px;
 				}
 			}

 			@media screen and (max-width: 800px) {
 				body[data-speaker-layout="default"] #speaker-controls {
 					font-size: 12px;
 				}
 			}

 		</style>
 	</head>

 	<body>

 		<div id="connection-status">Loading speaker view...</div>

 		<div id="current-slide"></div>
 		<div id="upcoming-slide"><span class="overlay-element label">Upcoming</span></div>
 		<div id="speaker-controls">
 			<div class="speaker-controls-time">
 				<h4 class="label">Time <span class="reset-button">Click to Reset</span></h4>
 				<div class="clock">
 					<span class="clock-value">0:00 AM</span>
 				</div>
 				<div class="timer">
 					<span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
 				</div>
 				<div class="clear"></div>

 				<h4 class="label pacing-title" style="display: none">Pacing – Time to finish current slide</h4>
 				<div class="pacing" style="display: none">
 					<span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
 				</div>
 			</div>

 			<div class="speaker-controls-notes hidden">
 				<h4 class="label">Notes</h4>
 				<div class="value"></div>
 			</div>
 		</div>
 		<div id="speaker-layout" class="overlay-element interactive">
 			<span class="speaker-layout-label"></span>
 			<select class="speaker-layout-dropdown"></select>
 		</div>

 		<script>

 			(function() {

 				var notes,
 					notesValue,
 					currentState,
 					currentSlide,
 					upcomingSlide,
 					layoutLabel,
 					layoutDropdown,
 					pendingCalls = {},
 					lastRevealApiCallId = 0,
 					connected = false

 				var connectionStatus = document.querySelector( '#connection-status' );

 				var SPEAKER_LAYOUTS = {
 					'default': 'Default',
 					'wide': 'Wide',
 					'tall': 'Tall',
 					'notes-only': 'Notes only'
 				};

 				setupLayout();

 				let openerOrigin;

 				try {
 					openerOrigin = window.opener.location.origin;
 				}
 				catch ( error ) { console.warn( error ) }

 				// In order to prevent XSS, the speaker view will only run if its
 				// opener has the same origin as itself
 				if( window.location.origin !== openerOrigin ) {
 					connectionStatus.innerHTML = 'Cross origin error.<br>The speaker window can only be opened from the same origin.';
 					return;
 				}

 				var connectionTimeout = setTimeout( function() {
 					connectionStatus.innerHTML = 'Error connecting to main window.<br>Please try closing and reopening the speaker view.';
 				}, 5000 );

 				window.addEventListener( 'message', function( event ) {

 					clearTimeout( connectionTimeout );
 					connectionStatus.style.display = 'none';

 					var data = JSON.parse( event.data );

 					// The overview mode is only useful to the reveal.js instance
 					// where navigation occurs so we don't sync it
 					if( data.state ) delete data.state.overview;

 					// Messages sent by the notes plugin inside of the main window
 					if( data && data.namespace === 'reveal-notes' ) {
 						if( data.type === 'connect' ) {
 							handleConnectMessage( data );
 						}
 						else if( data.type === 'state' ) {
 							handleStateMessage( data );
 						}
 						else if( data.type === 'return' ) {
 							pendingCalls[data.callId](data.result);
 							delete pendingCalls[data.callId];
 						}
 					}
 					// Messages sent by the reveal.js inside of the current slide preview
 					else if( data && data.namespace === 'reveal' ) {
 						if( /ready/.test( data.eventName ) ) {
 							// Send a message back to notify that the handshake is complete
 							window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'connected'} ), '*' );
 						}
 						else if( /slidechanged|fragmentshown|fragmenthidden|paused|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {

 							dispatchStateToMainWindow( data.state );

 						}
 					}

 				} );

 				/**
 				 * Updates the presentation in the main window to match the state
 				 * of the presentation in the notes window.
 				 */
 				const dispatchStateToMainWindow = debounce(( state ) => {
 					window.opener.postMessage( JSON.stringify({ method: 'setState', args: [ state ]} ), '*' );
 				}, 500);

 				/**
 				 * Asynchronously calls the Reveal.js API of the main frame.
 				 */
 				function callRevealApi( methodName, methodArguments, callback ) {

 					var callId = ++lastRevealApiCallId;
 					pendingCalls[callId] = callback;
 					window.opener.postMessage( JSON.stringify( {
 						namespace: 'reveal-notes',
 						type: 'call',
 						callId: callId,
 						methodName: methodName,
 						arguments: methodArguments
 					} ), '*' );

 				}

 				/**
 				 * Called when the main window is trying to establish a
 				 * connection.
 				 */
 				function handleConnectMessage( data ) {

 					if( connected === false ) {
 						connected = true;

 						setupIframes( data );
 						setupKeyboard();
 						setupNotes();
 						setupTimer();
 						setupHeartbeat();
 					}

 				}

 				/**
 				 * Called when the main window sends an updated state.
 				 */
 				function handleStateMessage( data ) {

 					// Store the most recently set state to avoid circular loops
 					// applying the same state
 					currentState = JSON.stringify( data.state );

 					// No need for updating the notes in case of fragment changes
 					if ( data.notes ) {
 						notes.classList.remove( 'hidden' );
 						notesValue.style.whiteSpace = data.whitespace;
 						if( data.markdown ) {
 							notesValue.innerHTML = marked( data.notes );
 						}
 						else {
 							notesValue.innerHTML = data.notes;
 						}
 					}
 					else {
 						notes.classList.add( 'hidden' );
 					}

 					// Update the note slides
 					currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
 					upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
 					upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'next' }), '*' );

 				}

 				// Limit to max one state update per X ms
 				handleStateMessage = debounce( handleStateMessage, 200 );

 				/**
 				 * Forward keyboard events to the current slide window.
 				 * This enables keyboard events to work even if focus
 				 * isn't set on the current slide iframe.
 				 *
 				 * Block F5 default handling, it reloads and disconnects
 				 * the speaker notes window.
 				 */
 				function setupKeyboard() {

 					document.addEventListener( 'keydown', function( event ) {
 						if( event.keyCode === 116 || ( event.metaKey && event.keyCode === 82 ) ) {
 							event.preventDefault();
 							return false;
 						}
 						currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
 					} );

 				}

 				/**
 				 * Creates the preview iframes.
 				 */
 				function setupIframes( data ) {

 					var params = [
 						'receiver',
 						'progress=false',
 						'history=false',
 						'transition=none',
 						'autoSlide=0',
 						'backgroundTransition=none'
 					].join( '&' );

 					var urlSeparator = /\?/.test(data.url) ? '&' : '?';
 					var hash = '#/' + data.state.indexh + '/' + data.state.indexv;
 					var currentURL = data.url + urlSeparator + params + '&postMessageEvents=true' + hash;
 					var upcomingURL = data.url + urlSeparator + params + '&controls=false' + hash;

 					currentSlide = document.createElement( 'iframe' );
 					currentSlide.setAttribute( 'width', 1280 );
 					currentSlide.setAttribute( 'height', 1024 );
 					currentSlide.setAttribute( 'src', currentURL );
 					document.querySelector( '#current-slide' ).appendChild( currentSlide );

 					upcomingSlide = document.createElement( 'iframe' );
 					upcomingSlide.setAttribute( 'width', 640 );
 					upcomingSlide.setAttribute( 'height', 512 );
 					upcomingSlide.setAttribute( 'src', upcomingURL );
 					document.querySelector( '#upcoming-slide' ).appendChild( upcomingSlide );

 				}

 				/**
 				 * Setup the notes UI.
 				 */
 				function setupNotes() {

 					notes = document.querySelector( '.speaker-controls-notes' );
 					notesValue = document.querySelector( '.speaker-controls-notes .value' );

 				}

 				/**
 				 * We send out a heartbeat at all times to ensure we can
 				 * reconnect with the main presentation window after reloads.
 				 */
 				function setupHeartbeat() {

 					setInterval( () => {
 						window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'heartbeat'} ), '*' );
 					}, 1000 );

 				}

 				function getTimings( callback ) {

 					callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
 						callRevealApi( 'getConfig', [], function ( config ) {
 							var totalTime = config.totalTime;
 							var minTimePerSlide = config.minimumTimePerSlide || 0;
 							var defaultTiming = config.defaultTiming;
 							if ((defaultTiming == null) && (totalTime == null)) {
 								callback(null);
 								return;
 							}
 							// Setting totalTime overrides defaultTiming
 							if (totalTime) {
 								defaultTiming = 0;
 							}
 							var timings = [];
 							for ( var i in slideAttributes ) {
 								var slide = slideAttributes[ i ];
 								var timing = defaultTiming;
 								if( slide.hasOwnProperty( 'data-timing' )) {
 									var t = slide[ 'data-timing' ];
 									timing = parseInt(t);
 									if( isNaN(timing) ) {
 										console.warn("Could not parse timing '" + t + "' of slide " + i + "; using default of " + defaultTiming);
 										timing = defaultTiming;
 									}
 								}
 								timings.push(timing);
 							}
 							if ( totalTime ) {
 								// After we've allocated time to individual slides, we summarize it and
 								// subtract it from the total time
 								var remainingTime = totalTime - timings.reduce( function(a, b) { return a + b; }, 0 );
 								// The remaining time is divided by the number of slides that have 0 seconds
 								// allocated at the moment, giving the average time-per-slide on the remaining slides
 								var remainingSlides = (timings.filter( function(x) { return x == 0 }) ).length
 								var timePerSlide = Math.round( remainingTime / remainingSlides, 0 )
 								// And now we replace every zero-value timing with that average
 								timings = timings.map( function(x) { return (x==0 ? timePerSlide : x) } );
 							}
 							var slidesUnderMinimum = timings.filter( function(x) { return (x < minTimePerSlide) } ).length
 							if ( slidesUnderMinimum ) {
 								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).";
 								alert(message);
 							}
 							callback( timings );
 						} );
 					} );

 				}

 				/**
 				 * Return the number of seconds allocated for presenting
 				 * all slides up to and including this one.
 				 */
 				function getTimeAllocated( timings, callback ) {

 					callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
 						var allocated = 0;
 						for (var i in timings.slice(0, currentSlide + 1)) {
 							allocated += timings[i];
 						}
 						callback( allocated );
 					} );

 				}

 				/**
 				 * Create the timer and clock and start updating them
 				 * at an interval.
 				 */
 				function setupTimer() {

 					var start = new Date(),
 					timeEl = document.querySelector( '.speaker-controls-time' ),
 					clockEl = timeEl.querySelector( '.clock-value' ),
 					hoursEl = timeEl.querySelector( '.hours-value' ),
 					minutesEl = timeEl.querySelector( '.minutes-value' ),
 					secondsEl = timeEl.querySelector( '.seconds-value' ),
 					pacingTitleEl = timeEl.querySelector( '.pacing-title' ),
 					pacingEl = timeEl.querySelector( '.pacing' ),
 					pacingHoursEl = pacingEl.querySelector( '.hours-value' ),
 					pacingMinutesEl = pacingEl.querySelector( '.minutes-value' ),
 					pacingSecondsEl = pacingEl.querySelector( '.seconds-value' );

 					var timings = null;
 					getTimings( function ( _timings ) {

 						timings = _timings;
 						if (_timings !== null) {
 							pacingTitleEl.style.removeProperty('display');
 							pacingEl.style.removeProperty('display');
 						}

 						// Update once directly
 						_updateTimer();

 						// Then update every second
 						setInterval( _updateTimer, 1000 );

 					} );


 					function _resetTimer() {

 						if (timings == null) {
 							start = new Date();
 							_updateTimer();
 						}
 						else {
 							// Reset timer to beginning of current slide
 							getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
 								var slideEndTiming = slideEndTimingSeconds * 1000;
 								callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
 									var currentSlideTiming = timings[currentSlide] * 1000;
 									var previousSlidesTiming = slideEndTiming - currentSlideTiming;
 									var now = new Date();
 									start = new Date(now.getTime() - previousSlidesTiming);
 									_updateTimer();
 								} );
 							} );
 						}

 					}

 					timeEl.addEventListener( 'click', function() {
 						_resetTimer();
 						return false;
 					} );

 					function _displayTime( hrEl, minEl, secEl, time) {

 						var sign = Math.sign(time) == -1 ? "-" : "";
 						time = Math.abs(Math.round(time / 1000));
 						var seconds = time % 60;
 						var minutes = Math.floor( time / 60 ) % 60 ;
 						var hours = Math.floor( time / ( 60 * 60 )) ;
 						hrEl.innerHTML = sign + zeroPadInteger( hours );
 						if (hours == 0) {
 							hrEl.classList.add( 'mute' );
 						}
 						else {
 							hrEl.classList.remove( 'mute' );
 						}
 						minEl.innerHTML = ':' + zeroPadInteger( minutes );
 						if (hours == 0 && minutes == 0) {
 							minEl.classList.add( 'mute' );
 						}
 						else {
 							minEl.classList.remove( 'mute' );
 						}
 						secEl.innerHTML = ':' + zeroPadInteger( seconds );
 					}

 					function _updateTimer() {

 						var diff, hours, minutes, seconds,
 						now = new Date();

 						diff = now.getTime() - start.getTime();

 						clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
 						_displayTime( hoursEl, minutesEl, secondsEl, diff );
 						if (timings !== null) {
 							_updatePacing(diff);
 						}

 					}

 					function _updatePacing(diff) {

 						getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
 							var slideEndTiming = slideEndTimingSeconds * 1000;

 							callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
 								var currentSlideTiming = timings[currentSlide] * 1000;
 								var timeLeftCurrentSlide = slideEndTiming - diff;
 								if (timeLeftCurrentSlide < 0) {
 									pacingEl.className = 'pacing behind';
 								}
 								else if (timeLeftCurrentSlide < currentSlideTiming) {
 									pacingEl.className = 'pacing on-track';
 								}
 								else {
 									pacingEl.className = 'pacing ahead';
 								}
 								_displayTime( pacingHoursEl, pacingMinutesEl, pacingSecondsEl, timeLeftCurrentSlide );
 							} );
 						} );
 					}

 				}

 				/**
 				 * Sets up the speaker view layout and layout selector.
 				 */
 				function setupLayout() {

 					layoutDropdown = document.querySelector( '.speaker-layout-dropdown' );
 					layoutLabel = document.querySelector( '.speaker-layout-label' );

 					// Render the list of available layouts
 					for( var id in SPEAKER_LAYOUTS ) {
 						var option = document.createElement( 'option' );
 						option.setAttribute( 'value', id );
 						option.textContent = SPEAKER_LAYOUTS[ id ];
 						layoutDropdown.appendChild( option );
 					}

 					// Monitor the dropdown for changes
 					layoutDropdown.addEventListener( 'change', function( event ) {

 						setLayout( layoutDropdown.value );

 					}, false );

 					// Restore any currently persisted layout
 					setLayout( getLayout() );

 				}

 				/**
 				 * Sets a new speaker view layout. The layout is persisted
 				 * in local storage.
 				 */
 				function setLayout( value ) {

 					var title = SPEAKER_LAYOUTS[ value ];

 					layoutLabel.innerHTML = 'Layout' + ( title ? ( ': ' + title ) : '' );
 					layoutDropdown.value = value;

 					document.body.setAttribute( 'data-speaker-layout', value );

 					// Persist locally
 					if( supportsLocalStorage() ) {
 						window.localStorage.setItem( 'reveal-speaker-layout', value );
 					}

 				}

 				/**
 				 * Returns the ID of the most recently set speaker layout
 				 * or our default layout if none has been set.
 				 */
 				function getLayout() {

 					if( supportsLocalStorage() ) {
 						var layout = window.localStorage.getItem( 'reveal-speaker-layout' );
 						if( layout ) {
 							return layout;
 						}
 					}

 					// Default to the first record in the layouts hash
 					for( var id in SPEAKER_LAYOUTS ) {
 						return id;
 					}

 				}

 				function supportsLocalStorage() {

 					try {
 						localStorage.setItem('test', 'test');
 						localStorage.removeItem('test');
 						return true;
 					}
 					catch( e ) {
 						return false;
 					}

 				}

 				function zeroPadInteger( num ) {

 					var str = '00' + parseInt( num );
 					return str.substring( str.length - 2 );

 				}

 				/**
 				 * Limits the frequency at which a function can be called.
 				 */
 				function debounce( fn, ms ) {

 					var lastTime = 0,
 						timeout;

 					return function() {

 						var args = arguments;
 						var context = this;

 						clearTimeout( timeout );

 						var timeSinceLastCall = Date.now() - lastTime;
 						if( timeSinceLastCall > ms ) {
 							fn.apply( context, args );
 							lastTime = Date.now();
 						}
 						else {
 							timeout = setTimeout( function() {
 								fn.apply( context, args );
 								lastTime = Date.now();
 							}, ms - timeSinceLastCall );
 						}

 					}

 				}

 			})();

 		</script>
 	</body>
 </html>
	<!--
	NOTE: You need to build the notes plugin after making changes to this file.
	-->
	<html lang="en">
	<head>
	<meta charset="utf-8">

	<title>reveal.js - Speaker View</title>

	<style>
	body {
	font-family: Helvetica;
	font-size: 18px;
	}

	#current-slide,
	#upcoming-slide,
	#speaker-controls {
	padding: 6px;
	box-sizing: border-box;
	-moz-box-sizing: border-box;
	}

	#current-slide iframe,
	#upcoming-slide iframe {
	width: 100%;
	height: 100%;
	border: 1px solid #ddd;
	}

	#current-slide .label,
	#upcoming-slide .label {
	position: absolute;
	top: 10px;
	left: 10px;
	z-index: 2;
	}

	#connection-status {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 20;
	padding: 30% 20% 20% 20%;
	font-size: 18px;
	color: #222;
	background: #fff;
	text-align: center;
	box-sizing: border-box;
	line-height: 1.4;
	}

	.overlay-element {
	height: 34px;
	line-height: 34px;
	padding: 0 10px;
	text-shadow: none;
	background: rgba( 220, 220, 220, 0.8 );
	color: #222;
	font-size: 14px;
	}

	.overlay-element.interactive:hover {
	background: rgba( 220, 220, 220, 1 );
	}

	#current-slide {
	position: absolute;
	width: 60%;
	height: 100%;
	top: 0;
	left: 0;
	padding-right: 0;
	}

	#upcoming-slide {
	position: absolute;
	width: 40%;
	height: 40%;
	right: 0;
	top: 0;
	}

	/* Speaker controls */
	#speaker-controls {
	position: absolute;
	top: 40%;
	right: 0;
	width: 40%;
	height: 60%;
	overflow: auto;
	font-size: 18px;
	}

	.speaker-controls-time.hidden,
	.speaker-controls-notes.hidden {
	display: none;
	}

	.speaker-controls-time .label,
	.speaker-controls-pace .label,
	.speaker-controls-notes .label {
	text-transform: uppercase;
	font-weight: normal;
	font-size: 0.66em;
	color: #666;
	margin: 0;
	}

	.speaker-controls-time, .speaker-controls-pace {
	border-bottom: 1px solid rgba( 200, 200, 200, 0.5 );
	margin-bottom: 10px;
	padding: 10px 16px;
	padding-bottom: 20px;
	cursor: pointer;
	}

	.speaker-controls-time .reset-button {
	opacity: 0;
	float: right;
	color: #666;
	text-decoration: none;
	}
	.speaker-controls-time:hover .reset-button {
	opacity: 1;
	}

	.speaker-controls-time .timer,
	.speaker-controls-time .clock {
	width: 50%;
	}

	.speaker-controls-time .timer,
	.speaker-controls-time .clock,
	.speaker-controls-time .pacing .hours-value,
	.speaker-controls-time .pacing .minutes-value,
	.speaker-controls-time .pacing .seconds-value {
	font-size: 1.9em;
	}

	.speaker-controls-time .timer {
	float: left;
	}

	.speaker-controls-time .clock {
	float: right;
	text-align: right;
	}

	.speaker-controls-time span.mute {
	opacity: 0.3;
	}

	.speaker-controls-time .pacing-title {
	margin-top: 5px;
	}

	.speaker-controls-time .pacing.ahead {
	color: blue;
	}

	.speaker-controls-time .pacing.on-track {
	color: green;
	}

	.speaker-controls-time .pacing.behind {
	color: red;
	}

	.speaker-controls-notes {
	padding: 10px 16px;
	}

	.speaker-controls-notes .value {
	margin-top: 5px;
	line-height: 1.4;
	font-size: 1.2em;
	}

	/* Layout selector */
	#speaker-layout {
	position: absolute;
	top: 10px;
	right: 10px;
	color: #222;
	z-index: 10;
	}
	#speaker-layout select {
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
	border: 0;
	box-shadow: 0;
	cursor: pointer;
	opacity: 0;

	font-size: 1em;
	background-color: transparent;

	-moz-appearance: none;
	-webkit-appearance: none;
	-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
	}

	#speaker-layout select:focus {
	outline: none;
	box-shadow: none;
	}

	.clear {
	clear: both;
	}

	/* Speaker layout: Wide */
	body[data-speaker-layout="wide"] #current-slide,
	body[data-speaker-layout="wide"] #upcoming-slide {
	width: 50%;
	height: 45%;
	padding: 6px;
	}

	body[data-speaker-layout="wide"] #current-slide {
	top: 0;
	left: 0;
	}

	body[data-speaker-layout="wide"] #upcoming-slide {
	top: 0;
	left: 50%;
	}

	body[data-speaker-layout="wide"] #speaker-controls {
	top: 45%;
	left: 0;
	width: 100%;
	height: 50%;
	font-size: 1.25em;
	}

	/* Speaker layout: Tall */
	body[data-speaker-layout="tall"] #current-slide,
	body[data-speaker-layout="tall"] #upcoming-slide {
	width: 45%;
	height: 50%;
	padding: 6px;
	}

	body[data-speaker-layout="tall"] #current-slide {
	top: 0;
	left: 0;
	}

	body[data-speaker-layout="tall"] #upcoming-slide {
	top: 50%;
	left: 0;
	}

	body[data-speaker-layout="tall"] #speaker-controls {
	padding-top: 40px;
	top: 0;
	left: 45%;
	width: 55%;
	height: 100%;
	font-size: 1.25em;
	}

	/* Speaker layout: Notes only */
	body[data-speaker-layout="notes-only"] #current-slide,
	body[data-speaker-layout="notes-only"] #upcoming-slide {
	display: none;
	}

	body[data-speaker-layout="notes-only"] #speaker-controls {
	padding-top: 40px;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	font-size: 1.25em;
	}

	@media screen and (max-width: 1080px) {
	body[data-speaker-layout="default"] #speaker-controls {
	font-size: 16px;
	}
	}

	@media screen and (max-width: 900px) {
	body[data-speaker-layout="default"] #speaker-controls {
	font-size: 14px;
	}
	}

	@media screen and (max-width: 800px) {
	body[data-speaker-layout="default"] #speaker-controls {
	font-size: 12px;
	}
	}

	</style>
	</head>

	<body>

	<div id="connection-status">Loading speaker view...</div>

	<div id="current-slide"></div>
	<div id="upcoming-slide"><span class="overlay-element label">Upcoming</span></div>
	<div id="speaker-controls">
	<div class="speaker-controls-time">
	<h4 class="label">Time <span class="reset-button">Click to Reset</span></h4>
	<div class="clock">
	<span class="clock-value">0:00 AM</span>
	</div>
	<div class="timer">
	<span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
	</div>
	<div class="clear"></div>

	<h4 class="label pacing-title" style="display: none">Pacing – Time to finish current slide</h4>
	<div class="pacing" style="display: none">
	<span class="hours-value">00</span><span class="minutes-value">:00</span><span class="seconds-value">:00</span>
	</div>
	</div>

	<div class="speaker-controls-notes hidden">
	<h4 class="label">Notes</h4>
	<div class="value"></div>
	</div>
	</div>
	<div id="speaker-layout" class="overlay-element interactive">
	<span class="speaker-layout-label"></span>
	<select class="speaker-layout-dropdown"></select>
	</div>

	<script>

	(function() {

	var notes,
	notesValue,
	currentState,
	currentSlide,
	upcomingSlide,
	layoutLabel,
	layoutDropdown,
	pendingCalls = {},
	lastRevealApiCallId = 0,
	connected = false

	var connectionStatus = document.querySelector( '#connection-status' );

	var SPEAKER_LAYOUTS = {
	'default': 'Default',
	'wide': 'Wide',
	'tall': 'Tall',
	'notes-only': 'Notes only'
	};

	setupLayout();

	let openerOrigin;

	try {
	openerOrigin = window.opener.location.origin;
	}
	catch ( error ) { console.warn( error ) }

	// In order to prevent XSS, the speaker view will only run if its
	// opener has the same origin as itself
	if( window.location.origin !== openerOrigin ) {
	connectionStatus.innerHTML = 'Cross origin error.<br>The speaker window can only be opened from the same origin.';
	return;
	}

	var connectionTimeout = setTimeout( function() {
	connectionStatus.innerHTML = 'Error connecting to main window.<br>Please try closing and reopening the speaker view.';
	}, 5000 );

	window.addEventListener( 'message', function( event ) {

	clearTimeout( connectionTimeout );
	connectionStatus.style.display = 'none';

	var data = JSON.parse( event.data );

	// The overview mode is only useful to the reveal.js instance
	// where navigation occurs so we don't sync it
	if( data.state ) delete data.state.overview;

	// Messages sent by the notes plugin inside of the main window
	if( data && data.namespace === 'reveal-notes' ) {
	if( data.type === 'connect' ) {
	handleConnectMessage( data );
	}
	else if( data.type === 'state' ) {
	handleStateMessage( data );
	}
	else if( data.type === 'return' ) {
	pendingCalls[data.callId](data.result);
	delete pendingCalls[data.callId];
	}
	}
	// Messages sent by the reveal.js inside of the current slide preview
	else if( data && data.namespace === 'reveal' ) {
	if( /ready/.test( data.eventName ) ) {
	// Send a message back to notify that the handshake is complete
	window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'connected'} ), '*' );
	}
	else if( /slidechanged\|fragmentshown\|fragmenthidden\|paused\|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {

	dispatchStateToMainWindow( data.state );

	}
	}

	} );

	/**
	* Updates the presentation in the main window to match the state
	* of the presentation in the notes window.
	*/
	const dispatchStateToMainWindow = debounce(( state ) => {
	window.opener.postMessage( JSON.stringify({ method: 'setState', args: [ state ]} ), '*' );
	}, 500);

	/**
	* Asynchronously calls the Reveal.js API of the main frame.
	*/
	function callRevealApi( methodName, methodArguments, callback ) {

	var callId = ++lastRevealApiCallId;
	pendingCalls[callId] = callback;
	window.opener.postMessage( JSON.stringify( {
	namespace: 'reveal-notes',
	type: 'call',
	callId: callId,
	methodName: methodName,
	arguments: methodArguments
	} ), '*' );

	}

	/**
	* Called when the main window is trying to establish a
	* connection.
	*/
	function handleConnectMessage( data ) {

	if( connected === false ) {
	connected = true;

	setupIframes( data );
	setupKeyboard();
	setupNotes();
	setupTimer();
	setupHeartbeat();
	}

	}

	/**
	* Called when the main window sends an updated state.
	*/
	function handleStateMessage( data ) {

	// Store the most recently set state to avoid circular loops
	// applying the same state
	currentState = JSON.stringify( data.state );

	// No need for updating the notes in case of fragment changes
	if ( data.notes ) {
	notes.classList.remove( 'hidden' );
	notesValue.style.whiteSpace = data.whitespace;
	if( data.markdown ) {
	notesValue.innerHTML = marked( data.notes );
	}
	else {
	notesValue.innerHTML = data.notes;
	}
	}
	else {
	notes.classList.add( 'hidden' );
	}

	// Update the note slides
	currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
	upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'setState', args: [ data.state ] }), '*' );
	upcomingSlide.contentWindow.postMessage( JSON.stringify({ method: 'next' }), '*' );

	}

	// Limit to max one state update per X ms
	handleStateMessage = debounce( handleStateMessage, 200 );

	/**
	* Forward keyboard events to the current slide window.
	* This enables keyboard events to work even if focus
	* isn't set on the current slide iframe.
	*
	* Block F5 default handling, it reloads and disconnects
	* the speaker notes window.
	*/
	function setupKeyboard() {

	document.addEventListener( 'keydown', function( event ) {
	if( event.keyCode === 116 \|\| ( event.metaKey && event.keyCode === 82 ) ) {
	event.preventDefault();
	return false;
	}
	currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
	} );

	}

	/**
	* Creates the preview iframes.
	*/
	function setupIframes( data ) {

	var params = [
	'receiver',
	'progress=false',
	'history=false',
	'transition=none',
	'autoSlide=0',
	'backgroundTransition=none'
	].join( '&' );

	var urlSeparator = /\?/.test(data.url) ? '&' : '?';
	var hash = '#/' + data.state.indexh + '/' + data.state.indexv;
	var currentURL = data.url + urlSeparator + params + '&postMessageEvents=true' + hash;
	var upcomingURL = data.url + urlSeparator + params + '&controls=false' + hash;

	currentSlide = document.createElement( 'iframe' );
	currentSlide.setAttribute( 'width', 1280 );
	currentSlide.setAttribute( 'height', 1024 );
	currentSlide.setAttribute( 'src', currentURL );
	document.querySelector( '#current-slide' ).appendChild( currentSlide );

	upcomingSlide = document.createElement( 'iframe' );
	upcomingSlide.setAttribute( 'width', 640 );
	upcomingSlide.setAttribute( 'height', 512 );
	upcomingSlide.setAttribute( 'src', upcomingURL );
	document.querySelector( '#upcoming-slide' ).appendChild( upcomingSlide );

	}

	/**
	* Setup the notes UI.
	*/
	function setupNotes() {

	notes = document.querySelector( '.speaker-controls-notes' );
	notesValue = document.querySelector( '.speaker-controls-notes .value' );

	}

	/**
	* We send out a heartbeat at all times to ensure we can
	* reconnect with the main presentation window after reloads.
	*/
	function setupHeartbeat() {

	setInterval( () => {
	window.opener.postMessage( JSON.stringify({ namespace: 'reveal-notes', type: 'heartbeat'} ), '*' );
	}, 1000 );

	}

	function getTimings( callback ) {

	callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
	callRevealApi( 'getConfig', [], function ( config ) {
	var totalTime = config.totalTime;
	var minTimePerSlide = config.minimumTimePerSlide \|\| 0;
	var defaultTiming = config.defaultTiming;
	if ((defaultTiming == null) && (totalTime == null)) {
	callback(null);
	return;
	}
	// Setting totalTime overrides defaultTiming
	if (totalTime) {
	defaultTiming = 0;
	}
	var timings = [];
	for ( var i in slideAttributes ) {
	var slide = slideAttributes[ i ];
	var timing = defaultTiming;
	if( slide.hasOwnProperty( 'data-timing' )) {
	var t = slide[ 'data-timing' ];
	timing = parseInt(t);
	if( isNaN(timing) ) {
	console.warn("Could not parse timing '" + t + "' of slide " + i + "; using default of " + defaultTiming);
	timing = defaultTiming;
	}
	}
	timings.push(timing);
	}
	if ( totalTime ) {
	// After we've allocated time to individual slides, we summarize it and
	// subtract it from the total time
	var remainingTime = totalTime - timings.reduce( function(a, b) { return a + b; }, 0 );
	// The remaining time is divided by the number of slides that have 0 seconds
	// allocated at the moment, giving the average time-per-slide on the remaining slides
	var remainingSlides = (timings.filter( function(x) { return x == 0 }) ).length
	var timePerSlide = Math.round( remainingTime / remainingSlides, 0 )
	// And now we replace every zero-value timing with that average
	timings = timings.map( function(x) { return (x==0 ? timePerSlide : x) } );
	}
	var slidesUnderMinimum = timings.filter( function(x) { return (x < minTimePerSlide) } ).length
	if ( slidesUnderMinimum ) {
	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).";
	alert(message);
	}
	callback( timings );
	} );
	} );

	}

	/**
	* Return the number of seconds allocated for presenting
	* all slides up to and including this one.
	*/
	function getTimeAllocated( timings, callback ) {

	callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
	var allocated = 0;
	for (var i in timings.slice(0, currentSlide + 1)) {
	allocated += timings[i];
	}
	callback( allocated );
	} );

	}

	/**
	* Create the timer and clock and start updating them
	* at an interval.
	*/
	function setupTimer() {

	var start = new Date(),
	timeEl = document.querySelector( '.speaker-controls-time' ),
	clockEl = timeEl.querySelector( '.clock-value' ),
	hoursEl = timeEl.querySelector( '.hours-value' ),
	minutesEl = timeEl.querySelector( '.minutes-value' ),
	secondsEl = timeEl.querySelector( '.seconds-value' ),
	pacingTitleEl = timeEl.querySelector( '.pacing-title' ),
	pacingEl = timeEl.querySelector( '.pacing' ),
	pacingHoursEl = pacingEl.querySelector( '.hours-value' ),
	pacingMinutesEl = pacingEl.querySelector( '.minutes-value' ),
	pacingSecondsEl = pacingEl.querySelector( '.seconds-value' );

	var timings = null;
	getTimings( function ( _timings ) {

	timings = _timings;
	if (_timings !== null) {
	pacingTitleEl.style.removeProperty('display');
	pacingEl.style.removeProperty('display');
	}

	// Update once directly
	_updateTimer();

	// Then update every second
	setInterval( _updateTimer, 1000 );

	} );


	function _resetTimer() {

	if (timings == null) {
	start = new Date();
	_updateTimer();
	}
	else {
	// Reset timer to beginning of current slide
	getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
	var slideEndTiming = slideEndTimingSeconds * 1000;
	callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
	var currentSlideTiming = timings[currentSlide] * 1000;
	var previousSlidesTiming = slideEndTiming - currentSlideTiming;
	var now = new Date();
	start = new Date(now.getTime() - previousSlidesTiming);
	_updateTimer();
	} );
	} );
	}

	}

	timeEl.addEventListener( 'click', function() {
	_resetTimer();
	return false;
	} );

	function _displayTime( hrEl, minEl, secEl, time) {

	var sign = Math.sign(time) == -1 ? "-" : "";
	time = Math.abs(Math.round(time / 1000));
	var seconds = time % 60;
	var minutes = Math.floor( time / 60 ) % 60 ;
	var hours = Math.floor( time / ( 60 * 60 )) ;
	hrEl.innerHTML = sign + zeroPadInteger( hours );
	if (hours == 0) {
	hrEl.classList.add( 'mute' );
	}
	else {
	hrEl.classList.remove( 'mute' );
	}
	minEl.innerHTML = ':' + zeroPadInteger( minutes );
	if (hours == 0 && minutes == 0) {
	minEl.classList.add( 'mute' );
	}
	else {
	minEl.classList.remove( 'mute' );
	}
	secEl.innerHTML = ':' + zeroPadInteger( seconds );
	}

	function _updateTimer() {

	var diff, hours, minutes, seconds,
	now = new Date();

	diff = now.getTime() - start.getTime();

	clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
	_displayTime( hoursEl, minutesEl, secondsEl, diff );
	if (timings !== null) {
	_updatePacing(diff);
	}

	}

	function _updatePacing(diff) {

	getTimeAllocated( timings, function ( slideEndTimingSeconds ) {
	var slideEndTiming = slideEndTimingSeconds * 1000;

	callRevealApi( 'getSlidePastCount', [], function ( currentSlide ) {
	var currentSlideTiming = timings[currentSlide] * 1000;
	var timeLeftCurrentSlide = slideEndTiming - diff;
	if (timeLeftCurrentSlide < 0) {
	pacingEl.className = 'pacing behind';
	}
	else if (timeLeftCurrentSlide < currentSlideTiming) {
	pacingEl.className = 'pacing on-track';
	}
	else {
	pacingEl.className = 'pacing ahead';
	}
	_displayTime( pacingHoursEl, pacingMinutesEl, pacingSecondsEl, timeLeftCurrentSlide );
	} );
	} );
	}

	}

	/**
	* Sets up the speaker view layout and layout selector.
	*/
	function setupLayout() {

	layoutDropdown = document.querySelector( '.speaker-layout-dropdown' );
	layoutLabel = document.querySelector( '.speaker-layout-label' );

	// Render the list of available layouts
	for( var id in SPEAKER_LAYOUTS ) {
	var option = document.createElement( 'option' );
	option.setAttribute( 'value', id );
	option.textContent = SPEAKER_LAYOUTS[ id ];
	layoutDropdown.appendChild( option );
	}

	// Monitor the dropdown for changes
	layoutDropdown.addEventListener( 'change', function( event ) {

	setLayout( layoutDropdown.value );

	}, false );

	// Restore any currently persisted layout
	setLayout( getLayout() );

	}

	/**
	* Sets a new speaker view layout. The layout is persisted
	* in local storage.
	*/
	function setLayout( value ) {

	var title = SPEAKER_LAYOUTS[ value ];

	layoutLabel.innerHTML = 'Layout' + ( title ? ( ': ' + title ) : '' );
	layoutDropdown.value = value;

	document.body.setAttribute( 'data-speaker-layout', value );

	// Persist locally
	if( supportsLocalStorage() ) {
	window.localStorage.setItem( 'reveal-speaker-layout', value );
	}

	}

	/**
	* Returns the ID of the most recently set speaker layout
	* or our default layout if none has been set.
	*/
	function getLayout() {

	if( supportsLocalStorage() ) {
	var layout = window.localStorage.getItem( 'reveal-speaker-layout' );
	if( layout ) {
	return layout;
	}
	}

	// Default to the first record in the layouts hash
	for( var id in SPEAKER_LAYOUTS ) {
	return id;
	}

	}

	function supportsLocalStorage() {

	try {
	localStorage.setItem('test', 'test');
	localStorage.removeItem('test');
	return true;
	}
	catch( e ) {
	return false;
	}

	}

	function zeroPadInteger( num ) {

	var str = '00' + parseInt( num );
	return str.substring( str.length - 2 );

	}

	/**
	* Limits the frequency at which a function can be called.
	*/
	function debounce( fn, ms ) {

	var lastTime = 0,
	timeout;

	return function() {

	var args = arguments;
	var context = this;

	clearTimeout( timeout );

	var timeSinceLastCall = Date.now() - lastTime;
	if( timeSinceLastCall > ms ) {
	fn.apply( context, args );
	lastTime = Date.now();
	}
	else {
	timeout = setTimeout( function() {
	fn.apply( context, args );
	lastTime = Date.now();
	}, ms - timeSinceLastCall );
	}

	}

	}

	})();

	</script>
	</body>
	</html>