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							<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8">

		<title>reveal.js - Slide Notes</title>

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

			#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;
				font-weight: bold;
				font-size: 14px;
				z-index: 2;
				color: rgba( 255, 255, 255, 0.9 );
			}

			#current-slide {
				position: absolute;
				width: 65%;
				height: 100%;
				top: 0;
				left: 0;
				padding-right: 0;
			}

			#upcoming-slide {
				position: absolute;
				width: 35%;
				height: 40%;
				right: 0;
				top: 0;
			}

			#speaker-controls {
				position: absolute;
				top: 40%;
				right: 0;
				width: 35%;
				height: 60%;

				font-size: 18px;
			}

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

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

				.speaker-controls-time {
					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%;
					font-size: 1.9em;
				}

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

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

				.speaker-controls-time span.mute {
					color: #bbb;
				}

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

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

			.clear {
				clear: both;
			}

			@media screen and (max-width: 1080px) {
				#speaker-controls {
					font-size: 16px;
				}
			}

			@media screen and (max-width: 900px) {
				#speaker-controls {
					font-size: 14px;
				}
			}

			@media screen and (max-width: 800px) {
				#speaker-controls {
					font-size: 12px;
				}
			}

		</style>
	</head>

	<body>

		<div id="current-slide"></div>
		<div id="upcoming-slide"><span class="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>
			</div>

			<div class="speaker-controls-notes hidden">
				<h4 class="label">Notes</h4>
				<div class="value"></div>
			</div>
		</div>

		<script src="/socket.io/socket.io.js"></script>
		<script src="/plugin/markdown/marked.js"></script>

		<script>
		(function() {

			var notes,
				notesValue,
				currentState,
				currentSlide,
				upcomingSlide,
				connected = false;

			var socket = io.connect( window.location.origin ),
				socketId = '{{socketId}}';

			socket.on( 'statechanged', function( data ) {

				// ignore data from sockets that aren't ours
				if( data.socketId !== socketId ) { return; }

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

					setupKeyboard();
					setupNotes();
					setupTimer();

				}

				handleStateMessage( data );

			} );

			// Load our presentation iframes
			setupIframes();

			// Once the iframes have loaded, emit a signal saying there's
			// a new subscriber which will trigger a 'statechanged'
			// message to be sent back
			window.addEventListener( 'message', function( event ) {

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

				if( data && data.namespace === 'reveal' ) {
					if( /ready/.test( data.eventName ) ) {
						socket.emit( 'new-subscriber', { socketId: socketId } );
					}
				}

				// Messages sent by reveal.js inside of the current slide preview
				if( data && data.namespace === 'reveal' ) {
					if( /slidechanged|fragmentshown|fragmenthidden|overviewshown|overviewhidden|paused|resumed/.test( data.eventName ) && currentState !== JSON.stringify( data.state ) ) {
						socket.emit( 'statechanged-speaker', { state: data.state } );
					}
				}

			} );

			/**
			 * 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' );
					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.
			 */
			function setupKeyboard() {

				document.addEventListener( 'keydown', function( event ) {
					currentSlide.contentWindow.postMessage( JSON.stringify({ method: 'triggerKey', args: [ event.keyCode ] }), '*' );
				} );

			}

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

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

				var currentURL = '/?' + params + '&postMessageEvents=true';
				var upcomingURL = '/?' + params + '&controls=false';

				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' );

			}

			/**
			 * 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' );

				function _updateTimer() {

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

					diff = now.getTime() - start.getTime();
					hours = Math.floor( diff / ( 1000 * 60 * 60 ) );
					minutes = Math.floor( ( diff / ( 1000 * 60 ) ) % 60 );
					seconds = Math.floor( ( diff / 1000 ) % 60 );

					clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
					hoursEl.innerHTML = zeroPadInteger( hours );
					hoursEl.className = hours > 0 ? '' : 'mute';
					minutesEl.innerHTML = ':' + zeroPadInteger( minutes );
					minutesEl.className = minutes > 0 ? '' : 'mute';
					secondsEl.innerHTML = ':' + zeroPadInteger( seconds );

				}

				// Update once directly
				_updateTimer();

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

				timeEl.addEventListener( 'click', function() {
					start = new Date();
					_updateTimer();
					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>