diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/index.html b/2019/04/summit-knative_build_and_tekton_pipelines/index.html new file mode 100644 index 0000000..2492fe8 --- /dev/null +++ b/2019/04/summit-knative_build_and_tekton_pipelines/index.html @@ -0,0 +1,2224 @@ + + +
+ + + + node has the
+ * 'data-line-numbers' attribute we also generate slide
+ * numbers.
+ *
+ * If the block contains multiple line highlight steps,
+ * we clone the block and create a fragment for each step.
+ */
+ highlightBlock: function( block ) {
+
+ hljs.highlightBlock( block );
+
+ if( block.hasAttribute( 'data-line-numbers' ) ) {
+ hljs.lineNumbersBlock( block, { singleLine: true } );
+
+ // If there is at least one highlight step, generate
+ // fragments
+ var highlightSteps = RevealHighlight.deserializeHighlightSteps( block.getAttribute( 'data-line-numbers' ) );
+ if( highlightSteps.length > 1 ) {
+
+ // If the original code block has a fragment-index,
+ // each clone should follow in an incremental sequence
+ var fragmentIndex = parseInt( block.getAttribute( 'data-fragment-index' ), 10 );
+
+ if( typeof fragmentIndex !== 'number' || isNaN( fragmentIndex ) ) {
+ fragmentIndex = null;
+ }
+
+ // Generate fragments for all steps except the original block
+ highlightSteps.slice(1).forEach( function( highlight ) {
+
+ var fragmentBlock = block.cloneNode( true );
+ fragmentBlock.setAttribute( 'data-line-numbers', RevealHighlight.serializeHighlightSteps( [ highlight ] ) );
+ fragmentBlock.classList.add( 'fragment' );
+ block.parentNode.appendChild( fragmentBlock );
+ RevealHighlight.highlightLines( fragmentBlock );
+
+ if( typeof fragmentIndex === 'number' ) {
+ fragmentBlock.setAttribute( 'data-fragment-index', fragmentIndex );
+ fragmentIndex += 1;
+ }
+ else {
+ fragmentBlock.removeAttribute( 'data-fragment-index' );
+ }
+
+ } );
+
+ block.removeAttribute( 'data-fragment-index' )
+ block.setAttribute( 'data-line-numbers', RevealHighlight.serializeHighlightSteps( [ highlightSteps[0] ] ) );
+
+ }
+
+ RevealHighlight.highlightLines( block );
+
+ }
+
+ },
+
+ /**
+ * Visually emphasize specific lines within a code block.
+ * This only works on blocks with line numbering turned on.
+ *
+ * @param {HTMLElement} block a block
+ * @param {String} [linesToHighlight] The lines that should be
+ * highlighted in this format:
+ * "1" = highlights line 1
+ * "2,5" = highlights lines 2 & 5
+ * "2,5-7" = highlights lines 2, 5, 6 & 7
+ */
+ highlightLines: function( block, linesToHighlight ) {
+
+ var highlightSteps = RevealHighlight.deserializeHighlightSteps( linesToHighlight || block.getAttribute( 'data-line-numbers' ) );
+
+ if( highlightSteps.length ) {
+
+ highlightSteps[0].forEach( function( highlight ) {
+
+ var elementsToHighlight = [];
+
+ // Highlight a range
+ if( typeof highlight.end === 'number' ) {
+ elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+highlight.start+'):nth-child(-n+'+highlight.end+')' ) );
+ }
+ // Highlight a single line
+ else if( typeof highlight.start === 'number' ) {
+ elementsToHighlight = [].slice.call( block.querySelectorAll( 'table tr:nth-child('+highlight.start+')' ) );
+ }
+
+ if( elementsToHighlight.length ) {
+ elementsToHighlight.forEach( function( lineElement ) {
+ lineElement.classList.add( 'highlight-line' );
+ } );
+
+ block.classList.add( 'has-highlights' );
+ }
+
+ } );
+
+ }
+
+ },
+
+ /**
+ * Parses and formats a user-defined string of line
+ * numbers to highlight.
+ *
+ * @example
+ * RevealHighlight.deserializeHighlightSteps( '1,2|3,5-10' )
+ * // [
+ * // [ { start: 1 }, { start: 2 } ],
+ * // [ { start: 3 }, { start: 5, end: 10 } ]
+ * // ]
+ */
+ deserializeHighlightSteps: function( highlightSteps ) {
+
+ // Remove whitespace
+ highlightSteps = highlightSteps.replace( /\s/g, '' );
+
+ // Divide up our line number groups
+ highlightSteps = highlightSteps.split( RevealHighlight.HIGHLIGHT_STEP_DELIMITER );
+
+ return highlightSteps.map( function( highlights ) {
+
+ return highlights.split( RevealHighlight.HIGHLIGHT_LINE_DELIMITER ).map( function( highlight ) {
+
+ // Parse valid line numbers
+ if( /^[\d-]+$/.test( highlight ) ) {
+
+ highlight = highlight.split( RevealHighlight.HIGHLIGHT_LINE_RANGE_DELIMITER );
+
+ var lineStart = parseInt( highlight[0], 10 ),
+ lineEnd = parseInt( highlight[1], 10 );
+
+ if( isNaN( lineEnd ) ) {
+ return {
+ start: lineStart
+ };
+ }
+ else {
+ return {
+ start: lineStart,
+ end: lineEnd
+ };
+ }
+
+ }
+ // If no line numbers are provided, no code will be highlighted
+ else {
+
+ return {};
+
+ }
+
+ } );
+
+ } );
+
+ },
+
+ /**
+ * Serializes parsed line number data into a string so
+ * that we can store it in the DOM.
+ */
+ serializeHighlightSteps: function( highlightSteps ) {
+
+ return highlightSteps.map( function( highlights ) {
+
+ return highlights.map( function( highlight ) {
+
+ // Line range
+ if( typeof highlight.end === 'number' ) {
+ return highlight.start + RevealHighlight.HIGHLIGHT_LINE_RANGE_DELIMITER + highlight.end;
+ }
+ // Single line
+ else if( typeof highlight.start === 'number' ) {
+ return highlight.start;
+ }
+ // All lines
+ else {
+ return '';
+ }
+
+ } ).join( RevealHighlight.HIGHLIGHT_LINE_DELIMITER );
+
+ } ).join( RevealHighlight.HIGHLIGHT_STEP_DELIMITER );
+
+ }
+
+ }
+
+ Reveal.registerPlugin( 'highlight', RevealHighlight );
+
+ return RevealHighlight;
+
+}));
\ No newline at end of file
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/markdown.js b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/markdown.js
new file mode 100644
index 0000000..50a82a9
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/markdown.js
@@ -0,0 +1,446 @@
+/**
+ * The reveal.js markdown plugin. Handles parsing of
+ * markdown inside of presentations as well as loading
+ * of external markdown documents.
+ */
+(function( root, factory ) {
+ if (typeof define === 'function' && define.amd) {
+ root.marked = require( './marked' );
+ root.RevealMarkdown = factory( root.marked );
+ } else if( typeof exports === 'object' ) {
+ module.exports = factory( require( './marked' ) );
+ } else {
+ // Browser globals (root is window)
+ root.RevealMarkdown = factory( root.marked );
+ }
+}( this, function( marked ) {
+
+ var DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
+ DEFAULT_NOTES_SEPARATOR = 'notes?:',
+ DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
+ DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';
+
+ var SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';
+
+
+ /**
+ * Retrieves the markdown contents of a slide section
+ * element. Normalizes leading tabs/whitespace.
+ */
+ function getMarkdownFromSlide( section ) {
+
+ // look for a ' );
+
+ var leadingWs = text.match( /^\n?(\s*)/ )[1].length,
+ leadingTabs = text.match( /^\n?(\t*)/ )[1].length;
+
+ if( leadingTabs > 0 ) {
+ text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
+ }
+ else if( leadingWs > 1 ) {
+ text = text.replace( new RegExp('\\n? {' + leadingWs + '}', 'g'), '\n' );
+ }
+
+ return text;
+
+ }
+
+ /**
+ * Given a markdown slide section element, this will
+ * return all arguments that aren't related to markdown
+ * parsing. Used to forward any other user-defined arguments
+ * to the output markdown slide.
+ */
+ function getForwardedAttributes( section ) {
+
+ var attributes = section.attributes;
+ var result = [];
+
+ for( var i = 0, len = attributes.length; i < len; i++ ) {
+ var name = attributes[i].name,
+ value = attributes[i].value;
+
+ // disregard attributes that are used for markdown loading/parsing
+ if( /data\-(markdown|separator|vertical|notes)/gi.test( name ) ) continue;
+
+ if( value ) {
+ result.push( name + '="' + value + '"' );
+ }
+ else {
+ result.push( name );
+ }
+ }
+
+ return result.join( ' ' );
+
+ }
+
+ /**
+ * Inspects the given options and fills out default
+ * values for what's not defined.
+ */
+ function getSlidifyOptions( options ) {
+
+ options = options || {};
+ options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR;
+ options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR;
+ options.attributes = options.attributes || '';
+
+ return options;
+
+ }
+
+ /**
+ * Helper function for constructing a markdown slide.
+ */
+ function createMarkdownSlide( content, options ) {
+
+ options = getSlidifyOptions( options );
+
+ var notesMatch = content.split( new RegExp( options.notesSeparator, 'mgi' ) );
+
+ if( notesMatch.length === 2 ) {
+ content = notesMatch[0] + '';
+ }
+
+ // prevent script end tags in the content from interfering
+ // with parsing
+ content = content.replace( /<\/script>/g, SCRIPT_END_PLACEHOLDER );
+
+ return '';
+
+ }
+
+ /**
+ * Parses a data string into multiple slides based
+ * on the passed in separator arguments.
+ */
+ function slidify( markdown, options ) {
+
+ options = getSlidifyOptions( options );
+
+ var separatorRegex = new RegExp( options.separator + ( options.verticalSeparator ? '|' + options.verticalSeparator : '' ), 'mg' ),
+ horizontalSeparatorRegex = new RegExp( options.separator );
+
+ var matches,
+ lastIndex = 0,
+ isHorizontal,
+ wasHorizontal = true,
+ content,
+ sectionStack = [];
+
+ // iterate until all blocks between separators are stacked up
+ while( matches = separatorRegex.exec( markdown ) ) {
+ notes = null;
+
+ // determine direction (horizontal by default)
+ isHorizontal = horizontalSeparatorRegex.test( matches[0] );
+
+ if( !isHorizontal && wasHorizontal ) {
+ // create vertical stack
+ sectionStack.push( [] );
+ }
+
+ // pluck slide content from markdown input
+ content = markdown.substring( lastIndex, matches.index );
+
+ if( isHorizontal && wasHorizontal ) {
+ // add to horizontal stack
+ sectionStack.push( content );
+ }
+ else {
+ // add to vertical stack
+ sectionStack[sectionStack.length-1].push( content );
+ }
+
+ lastIndex = separatorRegex.lastIndex;
+ wasHorizontal = isHorizontal;
+ }
+
+ // add the remaining slide
+ ( wasHorizontal ? sectionStack : sectionStack[sectionStack.length-1] ).push( markdown.substring( lastIndex ) );
+
+ var markdownSections = '';
+
+ // flatten the hierarchical stack, and insert tags
+ for( var i = 0, len = sectionStack.length; i < len; i++ ) {
+ // vertical
+ if( sectionStack[i] instanceof Array ) {
+ markdownSections += '';
+
+ sectionStack[i].forEach( function( child ) {
+ markdownSections += '' + createMarkdownSlide( child, options ) + ' ';
+ } );
+
+ markdownSections += ' ';
+ }
+ else {
+ markdownSections += '' + createMarkdownSlide( sectionStack[i], options ) + ' ';
+ }
+ }
+
+ return markdownSections;
+
+ }
+
+ /**
+ * Parses any current data-markdown slides, splits
+ * multi-slide markdown into separate sections and
+ * handles loading of external markdown.
+ */
+ function processSlides() {
+
+ return new Promise( function( resolve ) {
+
+ var externalPromises = [];
+
+ [].slice.call( document.querySelectorAll( '[data-markdown]') ).forEach( function( section, i ) {
+
+ if( section.getAttribute( 'data-markdown' ).length ) {
+
+ externalPromises.push( loadExternalMarkdown( section ).then(
+
+ // Finished loading external file
+ function( xhr, url ) {
+ section.outerHTML = slidify( xhr.responseText, {
+ separator: section.getAttribute( 'data-separator' ),
+ verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
+ notesSeparator: section.getAttribute( 'data-separator-notes' ),
+ attributes: getForwardedAttributes( section )
+ });
+ },
+
+ // Failed to load markdown
+ function( xhr, url ) {
+ section.outerHTML = '' +
+ 'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
+ 'Check your browser\'s JavaScript console for more details.' +
+ 'Remember that you need to serve the presentation HTML from a HTTP server.
' +
+ ' ';
+ }
+
+ ) );
+
+ }
+ else if( section.getAttribute( 'data-separator' ) || section.getAttribute( 'data-separator-vertical' ) || section.getAttribute( 'data-separator-notes' ) ) {
+
+ section.outerHTML = slidify( getMarkdownFromSlide( section ), {
+ separator: section.getAttribute( 'data-separator' ),
+ verticalSeparator: section.getAttribute( 'data-separator-vertical' ),
+ notesSeparator: section.getAttribute( 'data-separator-notes' ),
+ attributes: getForwardedAttributes( section )
+ });
+
+ }
+ else {
+ section.innerHTML = createMarkdownSlide( getMarkdownFromSlide( section ) );
+ }
+
+ });
+
+ Promise.all( externalPromises ).then( resolve );
+
+ } );
+
+ }
+
+ function loadExternalMarkdown( section ) {
+
+ return new Promise( function( resolve, reject ) {
+
+ var xhr = new XMLHttpRequest(),
+ url = section.getAttribute( 'data-markdown' );
+
+ datacharset = section.getAttribute( 'data-charset' );
+
+ // see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
+ if( datacharset != null && datacharset != '' ) {
+ xhr.overrideMimeType( 'text/html; charset=' + datacharset );
+ }
+
+ xhr.onreadystatechange = function( section, xhr ) {
+ if( xhr.readyState === 4 ) {
+ // file protocol yields status code 0 (useful for local debug, mobile applications etc.)
+ if ( ( xhr.status >= 200 && xhr.status < 300 ) || xhr.status === 0 ) {
+
+ resolve( xhr, url );
+
+ }
+ else {
+
+ reject( xhr, url );
+
+ }
+ }
+ }.bind( this, section, xhr );
+
+ xhr.open( 'GET', url, true );
+
+ try {
+ xhr.send();
+ }
+ catch ( e ) {
+ alert( 'Failed to get the Markdown file ' + url + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + e );
+ resolve( xhr, url );
+ }
+
+ } );
+
+ }
+
+ /**
+ * Check if a node value has the attributes pattern.
+ * If yes, extract it and add that value as one or several attributes
+ * to the target element.
+ *
+ * You need Cache Killer on Chrome to see the effect on any FOM transformation
+ * directly on refresh (F5)
+ * http://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
+ */
+ function addAttributeInElement( node, elementTarget, separator ) {
+
+ var mardownClassesInElementsRegex = new RegExp( separator, 'mg' );
+ var mardownClassRegex = new RegExp( "([^\"= ]+?)=\"([^\"=]+?)\"", 'mg' );
+ var nodeValue = node.nodeValue;
+ if( matches = mardownClassesInElementsRegex.exec( nodeValue ) ) {
+
+ var classes = matches[1];
+ nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( mardownClassesInElementsRegex.lastIndex );
+ node.nodeValue = nodeValue;
+ while( matchesClass = mardownClassRegex.exec( classes ) ) {
+ elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
+ }
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Add attributes to the parent element of a text node,
+ * or the element of an attribute node.
+ */
+ function addAttributes( section, element, previousElement, separatorElementAttributes, separatorSectionAttributes ) {
+
+ if ( element != null && element.childNodes != undefined && element.childNodes.length > 0 ) {
+ previousParentElement = element;
+ for( var i = 0; i < element.childNodes.length; i++ ) {
+ childElement = element.childNodes[i];
+ if ( i > 0 ) {
+ j = i - 1;
+ while ( j >= 0 ) {
+ aPreviousChildElement = element.childNodes[j];
+ if ( typeof aPreviousChildElement.setAttribute == 'function' && aPreviousChildElement.tagName != "BR" ) {
+ previousParentElement = aPreviousChildElement;
+ break;
+ }
+ j = j - 1;
+ }
+ }
+ parentSection = section;
+ if( childElement.nodeName == "section" ) {
+ parentSection = childElement ;
+ previousParentElement = childElement ;
+ }
+ if ( typeof childElement.setAttribute == 'function' || childElement.nodeType == Node.COMMENT_NODE ) {
+ addAttributes( parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes );
+ }
+ }
+ }
+
+ if ( element.nodeType == Node.COMMENT_NODE ) {
+ if ( addAttributeInElement( element, previousElement, separatorElementAttributes ) == false ) {
+ addAttributeInElement( element, section, separatorSectionAttributes );
+ }
+ }
+ }
+
+ /**
+ * Converts any current data-markdown slides in the
+ * DOM to HTML.
+ */
+ function convertSlides() {
+
+ var sections = document.querySelectorAll( '[data-markdown]:not([data-markdown-parsed])');
+
+ [].slice.call( sections ).forEach( function( section ) {
+
+ section.setAttribute( 'data-markdown-parsed', true )
+
+ var notes = section.querySelector( 'aside.notes' );
+ var markdown = getMarkdownFromSlide( section );
+
+ section.innerHTML = marked( markdown );
+ addAttributes( section, section, null, section.getAttribute( 'data-element-attributes' ) ||
+ section.parentNode.getAttribute( 'data-element-attributes' ) ||
+ DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR,
+ section.getAttribute( 'data-attributes' ) ||
+ section.parentNode.getAttribute( 'data-attributes' ) ||
+ DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR);
+
+ // If there were notes, we need to re-add them after
+ // having overwritten the section's HTML
+ if( notes ) {
+ section.appendChild( notes );
+ }
+
+ } );
+
+ return Promise.resolve();
+
+ }
+
+ // API
+ var RevealMarkdown = {
+
+ /**
+ * Starts processing and converting Markdown within the
+ * current reveal.js deck.
+ *
+ * @param {function} callback function to invoke once
+ * we've finished loading and parsing Markdown
+ */
+ init: function( callback ) {
+
+ if( typeof marked === 'undefined' ) {
+ throw 'The reveal.js Markdown plugin requires marked to be loaded';
+ }
+
+ if( typeof hljs !== 'undefined' ) {
+ marked.setOptions({
+ highlight: function( code, lang ) {
+ return hljs.highlightAuto( code, [lang] ).value;
+ }
+ });
+ }
+
+ // marked can be configured via reveal.js config options
+ var options = Reveal.getConfig().markdown;
+ if( options ) {
+ marked.setOptions( options );
+ }
+
+ return processSlides().then( convertSlides );
+
+ },
+
+ // TODO: Do these belong in the API?
+ processSlides: processSlides,
+ convertSlides: convertSlides,
+ slidify: slidify
+
+ };
+
+ // Register our plugin so that reveal.js will call our
+ // plugin 'init' method as part of the initialization
+ Reveal.registerPlugin( 'markdown', RevealMarkdown );
+
+ return RevealMarkdown;
+
+}));
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/marked.js b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/marked.js
new file mode 100644
index 0000000..481b9d8
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/markdown/marked.js
@@ -0,0 +1,6 @@
+/**
+ * marked - a markdown parser
+ * Copyright (c) 2011-2018, Christopher Jeffrey. (MIT Licensed)
+ * https://github.com/markedjs/marked
+ */
+!function(e){"use strict";var k={newline:/^\n+/,code:/^( {4}[^\n]+\n*)+/,fences:f,hr:/^ {0,3}((?:- *){3,}|(?:_ *){3,}|(?:\* *){3,})(?:\n+|$)/,heading:/^ *(#{1,6}) *([^\n]+?) *(?:#+ *)?(?:\n+|$)/,nptable:f,blockquote:/^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/,list:/^( {0,3})(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,html:"^ {0,3}(?:<(script|pre|style)[\\s>][\\s\\S]*?(?:\\1>[^\\n]*\\n+|$)|comment[^\\n]*(\\n+|$)|<\\?[\\s\\S]*?\\?>\\n*|\\n*|\\n*|?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=\\h*\\n)[\\s\\S]*?(?:\\n{2,}|$)|(?!script|pre|style)[a-z][\\w-]*\\s*>(?=\\h*\\n)[\\s\\S]*?(?:\\n{2,}|$))",def:/^ {0,3}\[(label)\]: *\n? *([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,table:f,lheading:/^([^\n]+)\n *(=|-){2,} *(?:\n+|$)/,paragraph:/^([^\n]+(?:\n(?!hr|heading|lheading| {0,3}>|<\/?(?:tag)(?: +|\n|\/?>)|<(?:script|pre|style|!--))[^\n]+)*)/,text:/^[^\n]+/};function a(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||m.defaults,this.rules=k.normal,this.options.pedantic?this.rules=k.pedantic:this.options.gfm&&(this.options.tables?this.rules=k.tables:this.rules=k.gfm)}k._label=/(?!\s*\])(?:\\[\[\]]|[^\[\]])+/,k._title=/(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/,k.def=i(k.def).replace("label",k._label).replace("title",k._title).getRegex(),k.bullet=/(?:[*+-]|\d{1,9}\.)/,k.item=/^( *)(bull) ?[^\n]*(?:\n(?!\1bull ?)[^\n]*)*/,k.item=i(k.item,"gm").replace(/bull/g,k.bullet).getRegex(),k.list=i(k.list).replace(/bull/g,k.bullet).replace("hr","\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))").replace("def","\\n+(?="+k.def.source+")").getRegex(),k._tag="address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul",k._comment=//,k.html=i(k.html,"i").replace("comment",k._comment).replace("tag",k._tag).replace("attribute",/ +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/).getRegex(),k.paragraph=i(k.paragraph).replace("hr",k.hr).replace("heading",k.heading).replace("lheading",k.lheading).replace("tag",k._tag).getRegex(),k.blockquote=i(k.blockquote).replace("paragraph",k.paragraph).getRegex(),k.normal=d({},k),k.gfm=d({},k.normal,{fences:/^ {0,3}(`{3,}|~{3,})([^`\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?:\n+|$)|$)/,paragraph:/^/,heading:/^ *(#{1,6}) 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";throw e}}f.exec=f,m.options=m.setOptions=function(e){return d(m.defaults,e),m},m.getDefaults=function(){return{baseUrl:null,breaks:!1,gfm:!0,headerIds:!0,headerPrefix:"",highlight:null,langPrefix:"language-",mangle:!0,pedantic:!1,renderer:new r,sanitize:!1,sanitizer:null,silent:!1,smartLists:!1,smartypants:!1,tables:!0,xhtml:!1}},m.defaults=m.getDefaults(),m.Parser=p,m.parser=p.parse,m.Renderer=r,m.TextRenderer=s,m.Lexer=a,m.lexer=a.lex,m.InlineLexer=h,m.inlineLexer=h.output,m.Slugger=t,m.parse=m,"undefined"!=typeof module&&"object"==typeof exports?module.exports=m:"function"==typeof define&&define.amd?define(function(){return m}):e.marked=m}(this||("undefined"!=typeof window?window:global));
\ No newline at end of file
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.html b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.html
new file mode 120000
index 0000000..feab1a5
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.html
@@ -0,0 +1 @@
+../../../../../../2016/05-Container_past_present_future-coreosfest-de/lib/reveal-plugins/notes/notes.html
\ No newline at end of file
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.js b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.js
new file mode 100644
index 0000000..3d5eac4
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/notes/notes.js
@@ -0,0 +1,178 @@
+/**
+ * Handles opening of and synchronization with the reveal.js
+ * notes window.
+ *
+ * Handshake process:
+ * 1. This window posts 'connect' to notes window
+ * - Includes URL of presentation to show
+ * 2. Notes window responds with 'connected' when it is available
+ * 3. This window proceeds to send the current presentation state
+ * to the notes window
+ */
+var RevealNotes = (function() {
+
+ var notesPopup = null;
+
+ function openNotes( notesFilePath ) {
+
+ if (notesPopup && !notesPopup.closed) {
+ notesPopup.focus();
+ return;
+ }
+
+ if( !notesFilePath ) {
+ var jsFileLocation = document.querySelector('script[src$="notes.js"]').src; // this js file path
+ jsFileLocation = jsFileLocation.replace(/notes\.js(\?.*)?$/, ''); // the js folder path
+ notesFilePath = jsFileLocation + 'notes.html';
+ }
+
+ notesPopup = window.open( notesFilePath, 'reveal.js - Notes', 'width=1100,height=700' );
+
+ if( !notesPopup ) {
+ alert( 'Speaker view popup failed to open. Please make sure popups are allowed and reopen the speaker view.' );
+ return;
+ }
+
+ /**
+ * Connect to the notes window through a postmessage handshake.
+ * Using postmessage enables us to work in situations where the
+ * origins differ, such as a presentation being opened from the
+ * file system.
+ */
+ function connect() {
+ // Keep trying to connect until we get a 'connected' message back
+ var connectInterval = setInterval( function() {
+ notesPopup.postMessage( JSON.stringify( {
+ namespace: 'reveal-notes',
+ type: 'connect',
+ url: window.location.protocol + '//' + window.location.host + window.location.pathname + window.location.search,
+ state: Reveal.getState()
+ } ), '*' );
+ }, 500 );
+
+ window.addEventListener( 'message', function( event ) {
+ var data = JSON.parse( event.data );
+ if( data && data.namespace === 'reveal-notes' && data.type === 'connected' ) {
+ clearInterval( connectInterval );
+ onConnected();
+ }
+ if( data && data.namespace === 'reveal-notes' && data.type === 'call' ) {
+ callRevealApi( data.methodName, data.arguments, data.callId );
+ }
+ } );
+ }
+
+ /**
+ * Calls the specified Reveal.js method with the provided argument
+ * and then pushes the result to the notes frame.
+ */
+ function callRevealApi( methodName, methodArguments, callId ) {
+
+ var result = Reveal[methodName].apply( Reveal, methodArguments );
+ notesPopup.postMessage( JSON.stringify( {
+ namespace: 'reveal-notes',
+ type: 'return',
+ result: result,
+ callId: callId
+ } ), '*' );
+
+ }
+
+ /**
+ * Posts the current slide data to the notes window
+ */
+ function post( event ) {
+
+ var slideElement = Reveal.getCurrentSlide(),
+ notesElement = slideElement.querySelector( 'aside.notes' ),
+ fragmentElement = slideElement.querySelector( '.current-fragment' );
+
+ var messageData = {
+ namespace: 'reveal-notes',
+ type: 'state',
+ notes: '',
+ markdown: false,
+ whitespace: 'normal',
+ state: Reveal.getState()
+ };
+
+ // Look for notes defined in a slide attribute
+ if( slideElement.hasAttribute( 'data-notes' ) ) {
+ messageData.notes = slideElement.getAttribute( 'data-notes' );
+ messageData.whitespace = 'pre-wrap';
+ }
+
+ // Look for notes defined in a fragment
+ if( fragmentElement ) {
+ var fragmentNotes = fragmentElement.querySelector( 'aside.notes' );
+ if( fragmentNotes ) {
+ notesElement = fragmentNotes;
+ }
+ else if( fragmentElement.hasAttribute( 'data-notes' ) ) {
+ messageData.notes = fragmentElement.getAttribute( 'data-notes' );
+ messageData.whitespace = 'pre-wrap';
+
+ // In case there are slide notes
+ notesElement = null;
+ }
+ }
+
+ // Look for notes defined in an aside element
+ if( notesElement ) {
+ messageData.notes = notesElement.innerHTML;
+ messageData.markdown = typeof notesElement.getAttribute( 'data-markdown' ) === 'string';
+ }
+
+ notesPopup.postMessage( JSON.stringify( messageData ), '*' );
+
+ }
+
+ /**
+ * Called once we have established a connection to the notes
+ * window.
+ */
+ function onConnected() {
+
+ // Monitor events that trigger a change in state
+ Reveal.addEventListener( 'slidechanged', post );
+ Reveal.addEventListener( 'fragmentshown', post );
+ Reveal.addEventListener( 'fragmenthidden', post );
+ Reveal.addEventListener( 'overviewhidden', post );
+ Reveal.addEventListener( 'overviewshown', post );
+ Reveal.addEventListener( 'paused', post );
+ Reveal.addEventListener( 'resumed', post );
+
+ // Post the initial state
+ post();
+
+ }
+
+ connect();
+
+ }
+
+ return {
+ init: function() {
+
+ if( !/receiver/i.test( window.location.search ) ) {
+
+ // If the there's a 'notes' query set, open directly
+ if( window.location.search.match( /(\?|\&)notes/gi ) !== null ) {
+ openNotes();
+ }
+
+ // Open the notes when the 's' key is hit
+ Reveal.addKeyBinding({keyCode: 83, key: 'S', description: 'Speaker notes view'}, function() {
+ openNotes();
+ } );
+
+ }
+
+ },
+
+ open: openNotes
+ };
+
+})();
+
+Reveal.registerPlugin( 'notes', RevealNotes );
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/zoom/zoom.js b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/zoom/zoom.js
new file mode 100644
index 0000000..92c3ba5
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal-plugins/zoom/zoom.js
@@ -0,0 +1,277 @@
+// Custom reveal.js integration
+var RevealZoom = (function(){
+
+ return {
+ init: function() {
+
+ Reveal.getRevealElement().addEventListener( 'mousedown', function( event ) {
+ var defaultModifier = /Linux/.test( window.navigator.platform ) ? 'ctrl' : 'alt';
+
+ var modifier = ( Reveal.getConfig().zoomKey ? Reveal.getConfig().zoomKey : defaultModifier ) + 'Key';
+ var zoomLevel = ( Reveal.getConfig().zoomLevel ? Reveal.getConfig().zoomLevel : 2 );
+
+ if( event[ modifier ] && !Reveal.isOverview() ) {
+ event.preventDefault();
+
+ zoom.to({
+ x: event.clientX,
+ y: event.clientY,
+ scale: zoomLevel,
+ pan: false
+ });
+ }
+ } );
+
+ }
+ }
+
+})();
+
+Reveal.registerPlugin( 'zoom', RevealZoom );
+
+/*!
+ * zoom.js 0.3 (modified for use with reveal.js)
+ * http://lab.hakim.se/zoom-js
+ * MIT licensed
+ *
+ * Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
+ */
+var zoom = (function(){
+
+ // The current zoom level (scale)
+ var level = 1;
+
+ // The current mouse position, used for panning
+ var mouseX = 0,
+ mouseY = 0;
+
+ // Timeout before pan is activated
+ var panEngageTimeout = -1,
+ panUpdateInterval = -1;
+
+ // Check for transform support so that we can fallback otherwise
+ var supportsTransforms = 'WebkitTransform' in document.body.style ||
+ 'MozTransform' in document.body.style ||
+ 'msTransform' in document.body.style ||
+ 'OTransform' in document.body.style ||
+ 'transform' in document.body.style;
+
+ if( supportsTransforms ) {
+ // The easing that will be applied when we zoom in/out
+ document.body.style.transition = 'transform 0.8s ease';
+ document.body.style.OTransition = '-o-transform 0.8s ease';
+ document.body.style.msTransition = '-ms-transform 0.8s ease';
+ document.body.style.MozTransition = '-moz-transform 0.8s ease';
+ document.body.style.WebkitTransition = '-webkit-transform 0.8s ease';
+ }
+
+ // Zoom out if the user hits escape
+ document.addEventListener( 'keyup', function( event ) {
+ if( level !== 1 && event.keyCode === 27 ) {
+ zoom.out();
+ }
+ } );
+
+ // Monitor mouse movement for panning
+ document.addEventListener( 'mousemove', function( event ) {
+ if( level !== 1 ) {
+ mouseX = event.clientX;
+ mouseY = event.clientY;
+ }
+ } );
+
+ /**
+ * Applies the CSS required to zoom in, prefers the use of CSS3
+ * transforms but falls back on zoom for IE.
+ *
+ * @param {Object} rect
+ * @param {Number} scale
+ */
+ function magnify( rect, scale ) {
+
+ var scrollOffset = getScrollOffset();
+
+ // Ensure a width/height is set
+ rect.width = rect.width || 1;
+ rect.height = rect.height || 1;
+
+ // Center the rect within the zoomed viewport
+ rect.x -= ( window.innerWidth - ( rect.width * scale ) ) / 2;
+ rect.y -= ( window.innerHeight - ( rect.height * scale ) ) / 2;
+
+ if( supportsTransforms ) {
+ // Reset
+ if( scale === 1 ) {
+ document.body.style.transform = '';
+ document.body.style.OTransform = '';
+ document.body.style.msTransform = '';
+ document.body.style.MozTransform = '';
+ document.body.style.WebkitTransform = '';
+ }
+ // Scale
+ else {
+ var origin = scrollOffset.x +'px '+ scrollOffset.y +'px',
+ transform = 'translate('+ -rect.x +'px,'+ -rect.y +'px) scale('+ scale +')';
+
+ document.body.style.transformOrigin = origin;
+ document.body.style.OTransformOrigin = origin;
+ document.body.style.msTransformOrigin = origin;
+ document.body.style.MozTransformOrigin = origin;
+ document.body.style.WebkitTransformOrigin = origin;
+
+ document.body.style.transform = transform;
+ document.body.style.OTransform = transform;
+ document.body.style.msTransform = transform;
+ document.body.style.MozTransform = transform;
+ document.body.style.WebkitTransform = transform;
+ }
+ }
+ else {
+ // Reset
+ if( scale === 1 ) {
+ document.body.style.position = '';
+ document.body.style.left = '';
+ document.body.style.top = '';
+ document.body.style.width = '';
+ document.body.style.height = '';
+ document.body.style.zoom = '';
+ }
+ // Scale
+ else {
+ document.body.style.position = 'relative';
+ document.body.style.left = ( - ( scrollOffset.x + rect.x ) / scale ) + 'px';
+ document.body.style.top = ( - ( scrollOffset.y + rect.y ) / scale ) + 'px';
+ document.body.style.width = ( scale * 100 ) + '%';
+ document.body.style.height = ( scale * 100 ) + '%';
+ document.body.style.zoom = scale;
+ }
+ }
+
+ level = scale;
+
+ if( document.documentElement.classList ) {
+ if( level !== 1 ) {
+ document.documentElement.classList.add( 'zoomed' );
+ }
+ else {
+ document.documentElement.classList.remove( 'zoomed' );
+ }
+ }
+ }
+
+ /**
+ * Pan the document when the mosue cursor approaches the edges
+ * of the window.
+ */
+ function pan() {
+ var range = 0.12,
+ rangeX = window.innerWidth * range,
+ rangeY = window.innerHeight * range,
+ scrollOffset = getScrollOffset();
+
+ // Up
+ if( mouseY < rangeY ) {
+ window.scroll( scrollOffset.x, scrollOffset.y - ( 1 - ( mouseY / rangeY ) ) * ( 14 / level ) );
+ }
+ // Down
+ else if( mouseY > window.innerHeight - rangeY ) {
+ window.scroll( scrollOffset.x, scrollOffset.y + ( 1 - ( window.innerHeight - mouseY ) / rangeY ) * ( 14 / level ) );
+ }
+
+ // Left
+ if( mouseX < rangeX ) {
+ window.scroll( scrollOffset.x - ( 1 - ( mouseX / rangeX ) ) * ( 14 / level ), scrollOffset.y );
+ }
+ // Right
+ else if( mouseX > window.innerWidth - rangeX ) {
+ window.scroll( scrollOffset.x + ( 1 - ( window.innerWidth - mouseX ) / rangeX ) * ( 14 / level ), scrollOffset.y );
+ }
+ }
+
+ function getScrollOffset() {
+ return {
+ x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
+ y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
+ }
+ }
+
+ return {
+ /**
+ * Zooms in on either a rectangle or HTML element.
+ *
+ * @param {Object} options
+ * - element: HTML element to zoom in on
+ * OR
+ * - x/y: coordinates in non-transformed space to zoom in on
+ * - width/height: the portion of the screen to zoom in on
+ * - scale: can be used instead of width/height to explicitly set scale
+ */
+ to: function( options ) {
+
+ // Due to an implementation limitation we can't zoom in
+ // to another element without zooming out first
+ if( level !== 1 ) {
+ zoom.out();
+ }
+ else {
+ options.x = options.x || 0;
+ options.y = options.y || 0;
+
+ // If an element is set, that takes precedence
+ if( !!options.element ) {
+ // Space around the zoomed in element to leave on screen
+ var padding = 20;
+ var bounds = options.element.getBoundingClientRect();
+
+ options.x = bounds.left - padding;
+ options.y = bounds.top - padding;
+ options.width = bounds.width + ( padding * 2 );
+ options.height = bounds.height + ( padding * 2 );
+ }
+
+ // If width/height values are set, calculate scale from those values
+ if( options.width !== undefined && options.height !== undefined ) {
+ options.scale = Math.max( Math.min( window.innerWidth / options.width, window.innerHeight / options.height ), 1 );
+ }
+
+ if( options.scale > 1 ) {
+ options.x *= options.scale;
+ options.y *= options.scale;
+
+ magnify( options, options.scale );
+
+ if( options.pan !== false ) {
+
+ // Wait with engaging panning as it may conflict with the
+ // zoom transition
+ panEngageTimeout = setTimeout( function() {
+ panUpdateInterval = setInterval( pan, 1000 / 60 );
+ }, 800 );
+
+ }
+ }
+ }
+ },
+
+ /**
+ * Resets the document zoom state to its default.
+ */
+ out: function() {
+ clearTimeout( panEngageTimeout );
+ clearInterval( panUpdateInterval );
+
+ magnify( { x: 0, y: 0 }, 1 );
+
+ level = 1;
+ },
+
+ // Alias
+ magnify: function( options ) { this.to( options ) },
+ reset: function() { this.out() },
+
+ zoomLevel: function() {
+ return level;
+ }
+ }
+
+})();
diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.css b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.css
new file mode 100644
index 0000000..8eafb35
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.css
@@ -0,0 +1,7 @@
+/*!
+ * reveal.js
+ * http://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2019 Hakim El Hattab, http://hakim.se
+ */.reveal div,.reveal span,.reveal applet,.reveal object,.reveal iframe,.reveal h1,.reveal h2,.reveal h3,.reveal h4,.reveal h5,.reveal h6,.reveal p,.reveal blockquote,.reveal pre,.reveal a,.reveal abbr,.reveal acronym,.reveal address,.reveal big,.reveal cite,.reveal code,.reveal del,.reveal dfn,.reveal em,.reveal img,.reveal ins,.reveal kbd,.reveal q,.reveal s,.reveal samp,.reveal small,.reveal strike,.reveal strong,.reveal sub,.reveal sup,.reveal tt,.reveal var,.reveal b,.reveal u,.reveal center,.reveal dl,.reveal dt,.reveal dd,.reveal ol,.reveal ul,.reveal li,.reveal fieldset,.reveal form,.reveal label,.reveal legend,.reveal table,.reveal caption,.reveal tbody,.reveal tfoot,.reveal thead,.reveal tr,.reveal th,.reveal td,.reveal article,.reveal aside,.reveal canvas,.reveal details,.reveal embed,.reveal figure,.reveal figcaption,.reveal footer,.reveal header,.reveal hgroup,.reveal menu,.reveal nav,.reveal output,.reveal ruby,.reveal section,.reveal summary,.reveal time,.reveal mark,.reveal audio,.reveal video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}html{width:100%;height:100%;height:100vh;height:calc( var(--vh, 1vh) * 100 );overflow:hidden}body{height:100%;overflow:hidden;position:relative;line-height:1;margin:0;background-color:#fff;color:#000}.reveal .slides section .fragment{opacity:0;visibility:hidden;-webkit-transition:all .2s ease;transition:all .2s ease}.reveal .slides section .fragment.visible{opacity:1;visibility:inherit}.reveal .slides section .fragment.grow{opacity:1;visibility:inherit}.reveal .slides section .fragment.grow.visible{-webkit-transform:scale(1.3);transform:scale(1.3)}.reveal .slides section .fragment.shrink{opacity:1;visibility:inherit}.reveal .slides section .fragment.shrink.visible{-webkit-transform:scale(0.7);transform:scale(0.7)}.reveal .slides section .fragment.zoom-in{-webkit-transform:scale(0.1);transform:scale(0.1)}.reveal .slides section 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diff --git a/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.min.js b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.min.js
new file mode 100644
index 0000000..9d2e433
--- /dev/null
+++ b/2019/04/summit-knative_build_and_tekton_pipelines/lib/reveal.min.js
@@ -0,0 +1,6054 @@
+/*!
+ * reveal.js
+ * http://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2019 Hakim El Hattab, http://hakim.se
+ */
+(function( root, factory ) {
+ if( typeof define === 'function' && define.amd ) {
+ // AMD. Register as an anonymous module.
+ define( function() {
+ root.Reveal = factory();
+ return root.Reveal;
+ } );
+ } else if( typeof exports === 'object' ) {
+ // Node. Does not work with strict CommonJS.
+ module.exports = factory();
+ } else {
+ // Browser globals.
+ root.Reveal = factory();
+ }
+}( this, function() {
+
+ 'use strict';
+
+ var Reveal;
+
+ // The reveal.js version
+ var VERSION = '3.8.0';
+
+ var SLIDES_SELECTOR = '.slides section',
+ HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
+ VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
+ HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
+ UA = navigator.userAgent,
+
+ // Configuration defaults, can be overridden at initialization time
+ config = {
+
+ // The "normal" size of the presentation, aspect ratio will be preserved
+ // when the presentation is scaled to fit different resolutions
+ width: 960,
+ height: 700,
+
+ // Factor of the display size that should remain empty around the content
+ margin: 0.1,
+
+ // Bounds for smallest/largest possible scale to apply to content
+ minScale: 0.2,
+ maxScale: 2.0,
+
+ // Display presentation control arrows
+ controls: true,
+
+ // Help the user learn the controls by providing hints, for example by
+ // bouncing the down arrow when they first encounter a vertical slide
+ controlsTutorial: true,
+
+ // Determines where controls appear, "edges" or "bottom-right"
+ controlsLayout: 'bottom-right',
+
+ // Visibility rule for backwards navigation arrows; "faded", "hidden"
+ // or "visible"
+ controlsBackArrows: 'faded',
+
+ // Display a presentation progress bar
+ progress: true,
+
+ // Display the page number of the current slide
+ // - true: Show slide number
+ // - false: Hide slide number
+ //
+ // Can optionally be set as a string that specifies the number formatting:
+ // - "h.v": Horizontal . vertical slide number (default)
+ // - "h/v": Horizontal / vertical slide number
+ // - "c": Flattened slide number
+ // - "c/t": Flattened slide number / total slides
+ //
+ // Alternatively, you can provide a function that returns the slide
+ // number for the current slide. The function needs to return an array
+ // with one string [slideNumber] or three strings [n1,delimiter,n2].
+ // See #formatSlideNumber().
+ slideNumber: false,
+
+ // Can be used to limit the contexts in which the slide number appears
+ // - "all": Always show the slide number
+ // - "print": Only when printing to PDF
+ // - "speaker": Only in the speaker view
+ showSlideNumber: 'all',
+
+ // Use 1 based indexing for # links to match slide number (default is zero
+ // based)
+ hashOneBasedIndex: false,
+
+ // Add the current slide number to the URL hash so that reloading the
+ // page/copying the URL will return you to the same slide
+ hash: false,
+
+ // Push each slide change to the browser history. Implies `hash: true`
+ history: false,
+
+ // Enable keyboard shortcuts for navigation
+ keyboard: true,
+
+ // Optional function that blocks keyboard events when retuning false
+ keyboardCondition: null,
+
+ // Enable the slide overview mode
+ overview: true,
+
+ // Disables the default reveal.js slide layout so that you can use
+ // custom CSS layout
+ disableLayout: false,
+
+ // Vertical centering of slides
+ center: true,
+
+ // Enables touch navigation on devices with touch input
+ touch: true,
+
+ // Loop the presentation
+ loop: false,
+
+ // Change the presentation direction to be RTL
+ rtl: false,
+
+ // Changes the behavior of our navigation directions.
+ //
+ // "default"
+ // Left/right arrow keys step between horizontal slides, up/down
+ // arrow keys step between vertical slides. Space key steps through
+ // all slides (both horizontal and vertical).
+ //
+ // "linear"
+ // Removes the up/down arrows. Left/right arrows step through all
+ // slides (both horizontal and vertical).
+ //
+ // "grid"
+ // When this is enabled, stepping left/right from a vertical stack
+ // to an adjacent vertical stack will land you at the same vertical
+ // index.
+ //
+ // Consider a deck with six slides ordered in two vertical stacks:
+ // 1.1 2.1
+ // 1.2 2.2
+ // 1.3 2.3
+ //
+ // If you're on slide 1.3 and navigate right, you will normally move
+ // from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
+ // from 1.3 -> 2.3.
+ navigationMode: 'default',
+
+ // Randomizes the order of slides each time the presentation loads
+ shuffle: false,
+
+ // Turns fragments on and off globally
+ fragments: true,
+
+ // Flags whether to include the current fragment in the URL,
+ // so that reloading brings you to the same fragment position
+ fragmentInURL: false,
+
+ // Flags if the presentation is running in an embedded mode,
+ // i.e. contained within a limited portion of the screen
+ embedded: false,
+
+ // Flags if we should show a help overlay when the question-mark
+ // key is pressed
+ help: true,
+
+ // Flags if it should be possible to pause the presentation (blackout)
+ pause: true,
+
+ // Flags if speaker notes should be visible to all viewers
+ showNotes: false,
+
+ // Global override for autolaying embedded media (video/audio/iframe)
+ // - null: Media will only autoplay if data-autoplay is present
+ // - true: All media will autoplay, regardless of individual setting
+ // - false: No media will autoplay, regardless of individual setting
+ autoPlayMedia: null,
+
+ // Global override for preloading lazy-loaded iframes
+ // - null: Iframes with data-src AND data-preload will be loaded when within
+ // the viewDistance, iframes with only data-src will be loaded when visible
+ // - true: All iframes with data-src will be loaded when within the viewDistance
+ // - false: All iframes with data-src will be loaded only when visible
+ preloadIframes: null,
+
+ // Controls automatic progression to the next slide
+ // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
+ // is present on the current slide or fragment
+ // - 1+: All slides will progress automatically at the given interval
+ // - false: No auto-sliding, even if data-autoslide is present
+ autoSlide: 0,
+
+ // Stop auto-sliding after user input
+ autoSlideStoppable: true,
+
+ // Use this method for navigation when auto-sliding (defaults to navigateNext)
+ autoSlideMethod: null,
+
+ // Specify the average time in seconds that you think you will spend
+ // presenting each slide. This is used to show a pacing timer in the
+ // speaker view
+ defaultTiming: null,
+
+ // Enable slide navigation via mouse wheel
+ mouseWheel: false,
+
+ // Apply a 3D roll to links on hover
+ rollingLinks: false,
+
+ // Hides the address bar on mobile devices
+ hideAddressBar: true,
+
+ // Opens links in an iframe preview overlay
+ // Add `data-preview-link` and `data-preview-link="false"` to customise each link
+ // individually
+ previewLinks: false,
+
+ // Exposes the reveal.js API through window.postMessage
+ postMessage: true,
+
+ // Dispatches all reveal.js events to the parent window through postMessage
+ postMessageEvents: false,
+
+ // Focuses body when page changes visibility to ensure keyboard shortcuts work
+ focusBodyOnPageVisibilityChange: true,
+
+ // Transition style
+ transition: 'default', // none/fade/slide/convex/concave/zoom
+
+ // Transition speed
+ transitionSpeed: 'default', // default/fast/slow
+
+ // Transition style for full page slide backgrounds
+ backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
+
+ // Parallax background image
+ parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
+
+ // Parallax background size
+ parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
+
+ // Parallax background repeat
+ parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
+
+ // Parallax background position
+ parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
+
+ // Amount of pixels to move the parallax background per slide step
+ parallaxBackgroundHorizontal: null,
+ parallaxBackgroundVertical: null,
+
+ // The maximum number of pages a single slide can expand onto when printing
+ // to PDF, unlimited by default
+ pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
+
+ // Prints each fragment on a separate slide
+ pdfSeparateFragments: true,
+
+ // Offset used to reduce the height of content within exported PDF pages.
+ // This exists to account for environment differences based on how you
+ // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
+ // on precisely the total height of the document whereas in-browser
+ // printing has to end one pixel before.
+ pdfPageHeightOffset: -1,
+
+ // Number of slides away from the current that are visible
+ viewDistance: 3,
+
+ // The display mode that will be used to show slides
+ display: 'block',
+
+ // Hide cursor if inactive
+ hideInactiveCursor: true,
+
+ // Time before the cursor is hidden (in ms)
+ hideCursorTime: 5000,
+
+ // Script dependencies to load
+ dependencies: []
+
+ },
+
+ // Flags if Reveal.initialize() has been called
+ initialized = false,
+
+ // Flags if reveal.js is loaded (has dispatched the 'ready' event)
+ loaded = false,
+
+ // Flags if the overview mode is currently active
+ overview = false,
+
+ // Holds the dimensions of our overview slides, including margins
+ overviewSlideWidth = null,
+ overviewSlideHeight = null,
+
+ // The horizontal and vertical index of the currently active slide
+ indexh,
+ indexv,
+
+ // The previous and current slide HTML elements
+ previousSlide,
+ currentSlide,
+
+ previousBackground,
+
+ // Remember which directions that the user has navigated towards
+ hasNavigatedRight = false,
+ hasNavigatedDown = false,
+
+ // Slides may hold a data-state attribute which we pick up and apply
+ // as a class to the body. This list contains the combined state of
+ // all current slides.
+ state = [],
+
+ // The current scale of the presentation (see width/height config)
+ scale = 1,
+
+ // CSS transform that is currently applied to the slides container,
+ // split into two groups
+ slidesTransform = { layout: '', overview: '' },
+
+ // Cached references to DOM elements
+ dom = {},
+
+ // A list of registered reveal.js plugins
+ plugins = {},
+
+ // List of asynchronously loaded reveal.js dependencies
+ asyncDependencies = [],
+
+ // Features supported by the browser, see #checkCapabilities()
+ features = {},
+
+ // Client is a mobile device, see #checkCapabilities()
+ isMobileDevice,
+
+ // Client is a desktop Chrome, see #checkCapabilities()
+ isChrome,
+
+ // Throttles mouse wheel navigation
+ lastMouseWheelStep = 0,
+
+ // Delays updates to the URL due to a Chrome thumbnailer bug
+ writeURLTimeout = 0,
+
+ // Is the mouse pointer currently hidden from view
+ cursorHidden = false,
+
+ // Timeout used to determine when the cursor is inactive
+ cursorInactiveTimeout = 0,
+
+ // Flags if the interaction event listeners are bound
+ eventsAreBound = false,
+
+ // The current auto-slide duration
+ autoSlide = 0,
+
+ // Auto slide properties
+ autoSlidePlayer,
+ autoSlideTimeout = 0,
+ autoSlideStartTime = -1,
+ autoSlidePaused = false,
+
+ // Holds information about the currently ongoing touch input
+ touch = {
+ startX: 0,
+ startY: 0,
+ startCount: 0,
+ captured: false,
+ threshold: 40
+ },
+
+ // A key:value map of shortcut keyboard keys and descriptions of
+ // the actions they trigger, generated in #configure()
+ keyboardShortcuts = {},
+
+ // Holds custom key code mappings
+ registeredKeyBindings = {};
+
+ /**
+ * Starts up the presentation if the client is capable.
+ */
+ function initialize( options ) {
+
+ // Make sure we only initialize once
+ if( initialized === true ) return;
+
+ initialized = true;
+
+ checkCapabilities();
+
+ if( !features.transforms2d && !features.transforms3d ) {
+ document.body.setAttribute( 'class', 'no-transforms' );
+
+ // Since JS won't be running any further, we load all lazy
+ // loading elements upfront
+ var images = toArray( document.getElementsByTagName( 'img' ) ),
+ iframes = toArray( document.getElementsByTagName( 'iframe' ) );
+
+ var lazyLoadable = images.concat( iframes );
+
+ for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
+ var element = lazyLoadable[i];
+ if( element.getAttribute( 'data-src' ) ) {
+ element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+ element.removeAttribute( 'data-src' );
+ }
+ }
+
+ // If the browser doesn't support core features we won't be
+ // using JavaScript to control the presentation
+ return;
+ }
+
+ // Cache references to key DOM elements
+ dom.wrapper = document.querySelector( '.reveal' );
+ dom.slides = document.querySelector( '.reveal .slides' );
+
+ // Force a layout when the whole page, incl fonts, has loaded
+ window.addEventListener( 'load', layout, false );
+
+ var query = Reveal.getQueryHash();
+
+ // Do not accept new dependencies via query config to avoid
+ // the potential of malicious script injection
+ if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
+
+ // Copy options over to our config object
+ extend( config, options );
+ extend( config, query );
+
+ // Hide the address bar in mobile browsers
+ hideAddressBar();
+
+ // Loads dependencies and continues to #start() once done
+ load();
+
+ }
+
+ /**
+ * Inspect the client to see what it's capable of, this
+ * should only happens once per runtime.
+ */
+ function checkCapabilities() {
+
+ isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
+ isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
+
+ var testElement = document.createElement( 'div' );
+
+ features.transforms3d = 'WebkitPerspective' in testElement.style ||
+ 'MozPerspective' in testElement.style ||
+ 'msPerspective' in testElement.style ||
+ 'OPerspective' in testElement.style ||
+ 'perspective' in testElement.style;
+
+ features.transforms2d = 'WebkitTransform' in testElement.style ||
+ 'MozTransform' in testElement.style ||
+ 'msTransform' in testElement.style ||
+ 'OTransform' in testElement.style ||
+ 'transform' in testElement.style;
+
+ features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
+ features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
+
+ features.canvas = !!document.createElement( 'canvas' ).getContext;
+
+ // Transitions in the overview are disabled in desktop and
+ // Safari due to lag
+ features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
+
+ // Flags if we should use zoom instead of transform to scale
+ // up slides. Zoom produces crisper results but has a lot of
+ // xbrowser quirks so we only use it in whitelsited browsers.
+ features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
+ ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
+
+ }
+
+ /**
+ * Loads the dependencies of reveal.js. Dependencies are
+ * defined via the configuration option 'dependencies'
+ * and will be loaded prior to starting/binding reveal.js.
+ * Some dependencies may have an 'async' flag, if so they
+ * will load after reveal.js has been started up.
+ */
+ function load() {
+
+ var scripts = [],
+ scriptsToLoad = 0;
+
+ config.dependencies.forEach( function( s ) {
+ // Load if there's no condition or the condition is truthy
+ if( !s.condition || s.condition() ) {
+ if( s.async ) {
+ asyncDependencies.push( s );
+ }
+ else {
+ scripts.push( s );
+ }
+ }
+ } );
+
+ if( scripts.length ) {
+ scriptsToLoad = scripts.length;
+
+ // Load synchronous scripts
+ scripts.forEach( function( s ) {
+ loadScript( s.src, function() {
+
+ if( typeof s.callback === 'function' ) s.callback();
+
+ if( --scriptsToLoad === 0 ) {
+ initPlugins();
+ }
+
+ } );
+ } );
+ }
+ else {
+ initPlugins();
+ }
+
+ }
+
+ /**
+ * Initializes our plugins and waits for them to be ready
+ * before proceeding.
+ */
+ function initPlugins() {
+
+ var pluginsToInitialize = Object.keys( plugins ).length;
+
+ // If there are no plugins, skip this step
+ if( pluginsToInitialize === 0 ) {
+ loadAsyncDependencies();
+ }
+ // ... otherwise initialize plugins
+ else {
+
+ var afterPlugInitialized = function() {
+ if( --pluginsToInitialize === 0 ) {
+ loadAsyncDependencies();
+ }
+ };
+
+ for( var i in plugins ) {
+
+ var plugin = plugins[i];
+
+ // If the plugin has an 'init' method, invoke it
+ if( typeof plugin.init === 'function' ) {
+ var callback = plugin.init();
+
+ // If the plugin returned a Promise, wait for it
+ if( callback && typeof callback.then === 'function' ) {
+ callback.then( afterPlugInitialized );
+ }
+ else {
+ afterPlugInitialized();
+ }
+ }
+ else {
+ afterPlugInitialized();
+ }
+
+ }
+
+ }
+
+ }
+
+ /**
+ * Loads all async reveal.js dependencies.
+ */
+ function loadAsyncDependencies() {
+
+ if( asyncDependencies.length ) {
+ asyncDependencies.forEach( function( s ) {
+ loadScript( s.src, s.callback );
+ } );
+ }
+
+ start();
+
+ }
+
+ /**
+ * Loads a JavaScript file from the given URL and executes it.
+ *
+ * @param {string} url Address of the .js file to load
+ * @param {function} callback Method to invoke when the script
+ * has loaded and executed
+ */
+ function loadScript( url, callback ) {
+
+ var script = document.createElement( 'script' );
+ script.type = 'text/javascript';
+ script.async = false;
+ script.defer = false;
+ script.src = url;
+
+ if( callback ) {
+
+ // Success callback
+ script.onload = script.onreadystatechange = function( event ) {
+ if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
+
+ // Kill event listeners
+ script.onload = script.onreadystatechange = script.onerror = null;
+
+ callback();
+
+ }
+ };
+
+ // Error callback
+ script.onerror = function( err ) {
+
+ // Kill event listeners
+ script.onload = script.onreadystatechange = script.onerror = null;
+
+ callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
+
+ };
+
+ }
+
+ // Append the script at the end of
+ var head = document.querySelector( 'head' );
+ head.insertBefore( script, head.lastChild );
+
+ }
+
+ /**
+ * Starts up reveal.js by binding input events and navigating
+ * to the current URL deeplink if there is one.
+ */
+ function start() {
+
+ loaded = true;
+
+ // Make sure we've got all the DOM elements we need
+ setupDOM();
+
+ // Listen to messages posted to this window
+ setupPostMessage();
+
+ // Prevent the slides from being scrolled out of view
+ setupScrollPrevention();
+
+ // Resets all vertical slides so that only the first is visible
+ resetVerticalSlides();
+
+ // Updates the presentation to match the current configuration values
+ configure();
+
+ // Read the initial hash
+ readURL();
+
+ // Update all backgrounds
+ updateBackground( true );
+
+ // Notify listeners that the presentation is ready but use a 1ms
+ // timeout to ensure it's not fired synchronously after #initialize()
+ setTimeout( function() {
+ // Enable transitions now that we're loaded
+ dom.slides.classList.remove( 'no-transition' );
+
+ dom.wrapper.classList.add( 'ready' );
+
+ dispatchEvent( 'ready', {
+ 'indexh': indexh,
+ 'indexv': indexv,
+ 'currentSlide': currentSlide
+ } );
+ }, 1 );
+
+ // Special setup and config is required when printing to PDF
+ if( isPrintingPDF() ) {
+ removeEventListeners();
+
+ // The document needs to have loaded for the PDF layout
+ // measurements to be accurate
+ if( document.readyState === 'complete' ) {
+ setupPDF();
+ }
+ else {
+ window.addEventListener( 'load', setupPDF );
+ }
+ }
+
+ }
+
+ /**
+ * Finds and stores references to DOM elements which are
+ * required by the presentation. If a required element is
+ * not found, it is created.
+ */
+ function setupDOM() {
+
+ // Prevent transitions while we're loading
+ dom.slides.classList.add( 'no-transition' );
+
+ if( isMobileDevice ) {
+ dom.wrapper.classList.add( 'no-hover' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'no-hover' );
+ }
+
+ if( /iphone/gi.test( UA ) ) {
+ dom.wrapper.classList.add( 'ua-iphone' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'ua-iphone' );
+ }
+
+ // Background element
+ dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
+
+ // Progress bar
+ dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '' );
+ dom.progressbar = dom.progress.querySelector( 'span' );
+
+ // Arrow controls
+ dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
+ '' +
+ '' +
+ '' +
+ '' );
+
+ // Slide number
+ dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
+
+ // Element containing notes that are visible to the audience
+ dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
+ dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
+ dom.speakerNotes.setAttribute( 'tabindex', '0' );
+
+ // Overlay graphic which is displayed during the paused mode
+ dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '' : null );
+
+ dom.wrapper.setAttribute( 'role', 'application' );
+
+ // There can be multiple instances of controls throughout the page
+ dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
+ dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
+ dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
+ dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
+ dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
+ dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
+
+ // The right and down arrows in the standard reveal.js controls
+ dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
+ dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
+
+ dom.statusDiv = createStatusDiv();
+ }
+
+ /**
+ * Creates a hidden div with role aria-live to announce the
+ * current slide content. Hide the div off-screen to make it
+ * available only to Assistive Technologies.
+ *
+ * @return {HTMLElement}
+ */
+ function createStatusDiv() {
+
+ var statusDiv = document.getElementById( 'aria-status-div' );
+ if( !statusDiv ) {
+ statusDiv = document.createElement( 'div' );
+ statusDiv.style.position = 'absolute';
+ statusDiv.style.height = '1px';
+ statusDiv.style.width = '1px';
+ statusDiv.style.overflow = 'hidden';
+ statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
+ statusDiv.setAttribute( 'id', 'aria-status-div' );
+ statusDiv.setAttribute( 'aria-live', 'polite' );
+ statusDiv.setAttribute( 'aria-atomic','true' );
+ dom.wrapper.appendChild( statusDiv );
+ }
+ return statusDiv;
+
+ }
+
+ /**
+ * Converts the given HTML element into a string of text
+ * that can be announced to a screen reader. Hidden
+ * elements are excluded.
+ */
+ function getStatusText( node ) {
+
+ var text = '';
+
+ // Text node
+ if( node.nodeType === 3 ) {
+ text += node.textContent;
+ }
+ // Element node
+ else if( node.nodeType === 1 ) {
+
+ var isAriaHidden = node.getAttribute( 'aria-hidden' );
+ var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
+ if( isAriaHidden !== 'true' && !isDisplayHidden ) {
+
+ toArray( node.childNodes ).forEach( function( child ) {
+ text += getStatusText( child );
+ } );
+
+ }
+
+ }
+
+ return text;
+
+ }
+
+ /**
+ * Configures the presentation for printing to a static
+ * PDF.
+ */
+ function setupPDF() {
+
+ var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
+
+ // Dimensions of the PDF pages
+ var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+ pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
+
+ // Dimensions of slides within the pages
+ var slideWidth = slideSize.width,
+ slideHeight = slideSize.height;
+
+ // Let the browser know what page size we want to print
+ injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
+
+ // Limit the size of certain elements to the dimensions of the slide
+ injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
+
+ document.body.classList.add( 'print-pdf' );
+ document.body.style.width = pageWidth + 'px';
+ document.body.style.height = pageHeight + 'px';
+
+ // Make sure stretch elements fit on slide
+ layoutSlideContents( slideWidth, slideHeight );
+
+ // Add each slide's index as attributes on itself, we need these
+ // indices to generate slide numbers below
+ toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
+ hslide.setAttribute( 'data-index-h', h );
+
+ if( hslide.classList.contains( 'stack' ) ) {
+ toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
+ vslide.setAttribute( 'data-index-h', h );
+ vslide.setAttribute( 'data-index-v', v );
+ } );
+ }
+ } );
+
+ // Slide and slide background layout
+ toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+
+ // Vertical stacks are not centred since their section
+ // children will be
+ if( slide.classList.contains( 'stack' ) === false ) {
+ // Center the slide inside of the page, giving the slide some margin
+ var left = ( pageWidth - slideWidth ) / 2,
+ top = ( pageHeight - slideHeight ) / 2;
+
+ var contentHeight = slide.scrollHeight;
+ var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
+
+ // Adhere to configured pages per slide limit
+ numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
+
+ // Center slides vertically
+ if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
+ top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
+ }
+
+ // Wrap the slide in a page element and hide its overflow
+ // so that no page ever flows onto another
+ var page = document.createElement( 'div' );
+ page.className = 'pdf-page';
+ page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
+ slide.parentNode.insertBefore( page, slide );
+ page.appendChild( slide );
+
+ // Position the slide inside of the page
+ slide.style.left = left + 'px';
+ slide.style.top = top + 'px';
+ slide.style.width = slideWidth + 'px';
+
+ if( slide.slideBackgroundElement ) {
+ page.insertBefore( slide.slideBackgroundElement, slide );
+ }
+
+ // Inject notes if `showNotes` is enabled
+ if( config.showNotes ) {
+
+ // Are there notes for this slide?
+ var notes = getSlideNotes( slide );
+ if( notes ) {
+
+ var notesSpacing = 8;
+ var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+ var notesElement = document.createElement( 'div' );
+ notesElement.classList.add( 'speaker-notes' );
+ notesElement.classList.add( 'speaker-notes-pdf' );
+ notesElement.setAttribute( 'data-layout', notesLayout );
+ notesElement.innerHTML = notes;
+
+ if( notesLayout === 'separate-page' ) {
+ page.parentNode.insertBefore( notesElement, page.nextSibling );
+ }
+ else {
+ notesElement.style.left = notesSpacing + 'px';
+ notesElement.style.bottom = notesSpacing + 'px';
+ notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
+ page.appendChild( notesElement );
+ }
+
+ }
+
+ }
+
+ // Inject slide numbers if `slideNumbers` are enabled
+ if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
+ var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
+ slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
+
+ var numberElement = document.createElement( 'div' );
+ numberElement.classList.add( 'slide-number' );
+ numberElement.classList.add( 'slide-number-pdf' );
+ numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
+ page.appendChild( numberElement );
+ }
+
+ // Copy page and show fragments one after another
+ if( config.pdfSeparateFragments ) {
+
+ // Each fragment 'group' is an array containing one or more
+ // fragments. Multiple fragments that appear at the same time
+ // are part of the same group.
+ var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
+
+ var previousFragmentStep;
+ var previousPage;
+
+ fragmentGroups.forEach( function( fragments ) {
+
+ // Remove 'current-fragment' from the previous group
+ if( previousFragmentStep ) {
+ previousFragmentStep.forEach( function( fragment ) {
+ fragment.classList.remove( 'current-fragment' );
+ } );
+ }
+
+ // Show the fragments for the current index
+ fragments.forEach( function( fragment ) {
+ fragment.classList.add( 'visible', 'current-fragment' );
+ } );
+
+ // Create a separate page for the current fragment state
+ var clonedPage = page.cloneNode( true );
+ page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
+
+ previousFragmentStep = fragments;
+ previousPage = clonedPage;
+
+ } );
+
+ // Reset the first/original page so that all fragments are hidden
+ fragmentGroups.forEach( function( fragments ) {
+ fragments.forEach( function( fragment ) {
+ fragment.classList.remove( 'visible', 'current-fragment' );
+ } );
+ } );
+
+ }
+ // Show all fragments
+ else {
+ toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
+ fragment.classList.add( 'visible' );
+ } );
+ }
+
+ }
+
+ } );
+
+ // Notify subscribers that the PDF layout is good to go
+ dispatchEvent( 'pdf-ready' );
+
+ }
+
+ /**
+ * This is an unfortunate necessity. Some actions – such as
+ * an input field being focused in an iframe or using the
+ * keyboard to expand text selection beyond the bounds of
+ * a slide – can trigger our content to be pushed out of view.
+ * This scrolling can not be prevented by hiding overflow in
+ * CSS (we already do) so we have to resort to repeatedly
+ * checking if the slides have been offset :(
+ */
+ function setupScrollPrevention() {
+
+ setInterval( function() {
+ if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
+ dom.wrapper.scrollTop = 0;
+ dom.wrapper.scrollLeft = 0;
+ }
+ }, 1000 );
+
+ }
+
+ /**
+ * Creates an HTML element and returns a reference to it.
+ * If the element already exists the existing instance will
+ * be returned.
+ *
+ * @param {HTMLElement} container
+ * @param {string} tagname
+ * @param {string} classname
+ * @param {string} innerHTML
+ *
+ * @return {HTMLElement}
+ */
+ function createSingletonNode( container, tagname, classname, innerHTML ) {
+
+ // Find all nodes matching the description
+ var nodes = container.querySelectorAll( '.' + classname );
+
+ // Check all matches to find one which is a direct child of
+ // the specified container
+ for( var i = 0; i < nodes.length; i++ ) {
+ var testNode = nodes[i];
+ if( testNode.parentNode === container ) {
+ return testNode;
+ }
+ }
+
+ // If no node was found, create it now
+ var node = document.createElement( tagname );
+ node.className = classname;
+ if( typeof innerHTML === 'string' ) {
+ node.innerHTML = innerHTML;
+ }
+ container.appendChild( node );
+
+ return node;
+
+ }
+
+ /**
+ * Creates the slide background elements and appends them
+ * to the background container. One element is created per
+ * slide no matter if the given slide has visible background.
+ */
+ function createBackgrounds() {
+
+ var printMode = isPrintingPDF();
+
+ // Clear prior backgrounds
+ dom.background.innerHTML = '';
+ dom.background.classList.add( 'no-transition' );
+
+ // Iterate over all horizontal slides
+ toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
+
+ var backgroundStack = createBackground( slideh, dom.background );
+
+ // Iterate over all vertical slides
+ toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
+
+ createBackground( slidev, backgroundStack );
+
+ backgroundStack.classList.add( 'stack' );
+
+ } );
+
+ } );
+
+ // Add parallax background if specified
+ if( config.parallaxBackgroundImage ) {
+
+ dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
+ dom.background.style.backgroundSize = config.parallaxBackgroundSize;
+ dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
+ dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
+
+ // Make sure the below properties are set on the element - these properties are
+ // needed for proper transitions to be set on the element via CSS. To remove
+ // annoying background slide-in effect when the presentation starts, apply
+ // these properties after short time delay
+ setTimeout( function() {
+ dom.wrapper.classList.add( 'has-parallax-background' );
+ }, 1 );
+
+ }
+ else {
+
+ dom.background.style.backgroundImage = '';
+ dom.wrapper.classList.remove( 'has-parallax-background' );
+
+ }
+
+ }
+
+ /**
+ * Creates a background for the given slide.
+ *
+ * @param {HTMLElement} slide
+ * @param {HTMLElement} container The element that the background
+ * should be appended to
+ * @return {HTMLElement} New background div
+ */
+ function createBackground( slide, container ) {
+
+
+ // Main slide background element
+ var element = document.createElement( 'div' );
+ element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
+
+ // Inner background element that wraps images/videos/iframes
+ var contentElement = document.createElement( 'div' );
+ contentElement.className = 'slide-background-content';
+
+ element.appendChild( contentElement );
+ container.appendChild( element );
+
+ slide.slideBackgroundElement = element;
+ slide.slideBackgroundContentElement = contentElement;
+
+ // Syncs the background to reflect all current background settings
+ syncBackground( slide );
+
+ return element;
+
+ }
+
+ /**
+ * Renders all of the visual properties of a slide background
+ * based on the various background attributes.
+ *
+ * @param {HTMLElement} slide
+ */
+ function syncBackground( slide ) {
+
+ var element = slide.slideBackgroundElement,
+ contentElement = slide.slideBackgroundContentElement;
+
+ // Reset the prior background state in case this is not the
+ // initial sync
+ slide.classList.remove( 'has-dark-background' );
+ slide.classList.remove( 'has-light-background' );
+
+ element.removeAttribute( 'data-loaded' );
+ element.removeAttribute( 'data-background-hash' );
+ element.removeAttribute( 'data-background-size' );
+ element.removeAttribute( 'data-background-transition' );
+ element.style.backgroundColor = '';
+
+ contentElement.style.backgroundSize = '';
+ contentElement.style.backgroundRepeat = '';
+ contentElement.style.backgroundPosition = '';
+ contentElement.style.backgroundImage = '';
+ contentElement.style.opacity = '';
+ contentElement.innerHTML = '';
+
+ var data = {
+ background: slide.getAttribute( 'data-background' ),
+ backgroundSize: slide.getAttribute( 'data-background-size' ),
+ backgroundImage: slide.getAttribute( 'data-background-image' ),
+ backgroundVideo: slide.getAttribute( 'data-background-video' ),
+ backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
+ backgroundColor: slide.getAttribute( 'data-background-color' ),
+ backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
+ backgroundPosition: slide.getAttribute( 'data-background-position' ),
+ backgroundTransition: slide.getAttribute( 'data-background-transition' ),
+ backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
+ };
+
+ if( data.background ) {
+ // Auto-wrap image urls in url(...)
+ if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
+ slide.setAttribute( 'data-background-image', data.background );
+ }
+ else {
+ element.style.background = data.background;
+ }
+ }
+
+ // Create a hash for this combination of background settings.
+ // This is used to determine when two slide backgrounds are
+ // the same.
+ if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
+ element.setAttribute( 'data-background-hash', data.background +
+ data.backgroundSize +
+ data.backgroundImage +
+ data.backgroundVideo +
+ data.backgroundIframe +
+ data.backgroundColor +
+ data.backgroundRepeat +
+ data.backgroundPosition +
+ data.backgroundTransition +
+ data.backgroundOpacity );
+ }
+
+ // Additional and optional background properties
+ if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
+ if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
+ if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
+
+ // Background image options are set on the content wrapper
+ if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
+ if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
+ if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
+ if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
+
+ // If this slide has a background color, we add a class that
+ // signals if it is light or dark. If the slide has no background
+ // color, no class will be added
+ var contrastColor = data.backgroundColor;
+
+ // If no bg color was found, check the computed background
+ if( !contrastColor ) {
+ var computedBackgroundStyle = window.getComputedStyle( element );
+ if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
+ contrastColor = computedBackgroundStyle.backgroundColor;
+ }
+ }
+
+ if( contrastColor ) {
+ var rgb = colorToRgb( contrastColor );
+
+ // Ignore fully transparent backgrounds. Some browsers return
+ // rgba(0,0,0,0) when reading the computed background color of
+ // an element with no background
+ if( rgb && rgb.a !== 0 ) {
+ if( colorBrightness( contrastColor ) < 128 ) {
+ slide.classList.add( 'has-dark-background' );
+ }
+ else {
+ slide.classList.add( 'has-light-background' );
+ }
+ }
+ }
+
+ }
+
+ /**
+ * Registers a listener to postMessage events, this makes it
+ * possible to call all reveal.js API methods from another
+ * window. For example:
+ *
+ * revealWindow.postMessage( JSON.stringify({
+ * method: 'slide',
+ * args: [ 2 ]
+ * }), '*' );
+ */
+ function setupPostMessage() {
+
+ if( config.postMessage ) {
+ window.addEventListener( 'message', function ( event ) {
+ var data = event.data;
+
+ // Make sure we're dealing with JSON
+ if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
+ data = JSON.parse( data );
+
+ // Check if the requested method can be found
+ if( data.method && typeof Reveal[data.method] === 'function' ) {
+ var result = Reveal[data.method].apply( Reveal, data.args );
+
+ // Dispatch a postMessage event with the returned value from
+ // our method invocation for getter functions
+ dispatchPostMessage( 'callback', { method: data.method, result: result } );
+ }
+ }
+ }, false );
+ }
+
+ }
+
+ /**
+ * Applies the configuration settings from the config
+ * object. May be called multiple times.
+ *
+ * @param {object} options
+ */
+ function configure( options ) {
+
+ var oldTransition = config.transition;
+
+ // New config options may be passed when this method
+ // is invoked through the API after initialization
+ if( typeof options === 'object' ) extend( config, options );
+
+ // Abort if reveal.js hasn't finished loading, config
+ // changes will be applied automatically once loading
+ // finishes
+ if( loaded === false ) return;
+
+ var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
+
+ // Remove the previously configured transition class
+ dom.wrapper.classList.remove( oldTransition );
+
+ // Force linear transition based on browser capabilities
+ if( features.transforms3d === false ) config.transition = 'linear';
+
+ dom.wrapper.classList.add( config.transition );
+
+ dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
+ dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
+
+ dom.controls.style.display = config.controls ? 'block' : 'none';
+ dom.progress.style.display = config.progress ? 'block' : 'none';
+
+ dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
+ dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
+
+ if( config.shuffle ) {
+ shuffle();
+ }
+
+ if( config.rtl ) {
+ dom.wrapper.classList.add( 'rtl' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'rtl' );
+ }
+
+ if( config.center ) {
+ dom.wrapper.classList.add( 'center' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'center' );
+ }
+
+ // Exit the paused mode if it was configured off
+ if( config.pause === false ) {
+ resume();
+ }
+
+ if( config.showNotes ) {
+ dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
+ }
+
+ if( config.mouseWheel ) {
+ document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
+ document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
+ }
+ else {
+ document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
+ document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
+ }
+
+ // Rolling 3D links
+ if( config.rollingLinks ) {
+ enableRollingLinks();
+ }
+ else {
+ disableRollingLinks();
+ }
+
+ // Auto-hide the mouse pointer when its inactive
+ if( config.hideInactiveCursor ) {
+ document.addEventListener( 'mousemove', onDocumentCursorActive, false );
+ document.addEventListener( 'mousedown', onDocumentCursorActive, false );
+ }
+ else {
+ showCursor();
+
+ document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
+ document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
+ }
+
+ // Iframe link previews
+ if( config.previewLinks ) {
+ enablePreviewLinks();
+ disablePreviewLinks( '[data-preview-link=false]' );
+ }
+ else {
+ disablePreviewLinks();
+ enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
+ }
+
+ // Remove existing auto-slide controls
+ if( autoSlidePlayer ) {
+ autoSlidePlayer.destroy();
+ autoSlidePlayer = null;
+ }
+
+ // Generate auto-slide controls if needed
+ if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
+ autoSlidePlayer = new Playback( dom.wrapper, function() {
+ return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
+ } );
+
+ autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
+ autoSlidePaused = false;
+ }
+
+ // When fragments are turned off they should be visible
+ if( config.fragments === false ) {
+ toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
+ element.classList.add( 'visible' );
+ element.classList.remove( 'current-fragment' );
+ } );
+ }
+
+ // Slide numbers
+ var slideNumberDisplay = 'none';
+ if( config.slideNumber && !isPrintingPDF() ) {
+ if( config.showSlideNumber === 'all' ) {
+ slideNumberDisplay = 'block';
+ }
+ else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
+ slideNumberDisplay = 'block';
+ }
+ }
+
+ dom.slideNumber.style.display = slideNumberDisplay;
+
+ // Add the navigation mode to the DOM so we can adjust styling
+ if( config.navigationMode !== 'default' ) {
+ dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
+ }
+ else {
+ dom.wrapper.removeAttribute( 'data-navigation-mode' );
+ }
+
+ // Define our contextual list of keyboard shortcuts
+ if( config.navigationMode === 'linear' ) {
+ keyboardShortcuts['→ , ↓ , SPACE , N , L , J'] = 'Next slide';
+ keyboardShortcuts['← , ↑ , P , H , K'] = 'Previous slide';
+ }
+ else {
+ keyboardShortcuts['N , SPACE'] = 'Next slide';
+ keyboardShortcuts['P'] = 'Previous slide';
+ keyboardShortcuts['← , H'] = 'Navigate left';
+ keyboardShortcuts['→ , L'] = 'Navigate right';
+ keyboardShortcuts['↑ , K'] = 'Navigate up';
+ keyboardShortcuts['↓ , J'] = 'Navigate down';
+ }
+
+ keyboardShortcuts['Home , ⌘/CTRL ←'] = 'First slide';
+ keyboardShortcuts['End , ⌘/CTRL →'] = 'Last slide';
+ keyboardShortcuts['B , .'] = 'Pause';
+ keyboardShortcuts['F'] = 'Fullscreen';
+ keyboardShortcuts['ESC, O'] = 'Slide overview';
+
+ sync();
+
+ }
+
+ /**
+ * Binds all event listeners.
+ */
+ function addEventListeners() {
+
+ eventsAreBound = true;
+
+ window.addEventListener( 'hashchange', onWindowHashChange, false );
+ window.addEventListener( 'resize', onWindowResize, false );
+
+ if( config.touch ) {
+ if( 'onpointerdown' in window ) {
+ // Use W3C pointer events
+ dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
+ dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
+ dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
+ }
+ else if( window.navigator.msPointerEnabled ) {
+ // IE 10 uses prefixed version of pointer events
+ dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
+ dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
+ dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
+ }
+ else {
+ // Fall back to touch events
+ dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
+ dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
+ dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
+ }
+ }
+
+ if( config.keyboard ) {
+ document.addEventListener( 'keydown', onDocumentKeyDown, false );
+ document.addEventListener( 'keypress', onDocumentKeyPress, false );
+ }
+
+ if( config.progress && dom.progress ) {
+ dom.progress.addEventListener( 'click', onProgressClicked, false );
+ }
+
+ dom.pauseOverlay.addEventListener( 'click', resume, false );
+
+ if( config.focusBodyOnPageVisibilityChange ) {
+ var visibilityChange;
+
+ if( 'hidden' in document ) {
+ visibilityChange = 'visibilitychange';
+ }
+ else if( 'msHidden' in document ) {
+ visibilityChange = 'msvisibilitychange';
+ }
+ else if( 'webkitHidden' in document ) {
+ visibilityChange = 'webkitvisibilitychange';
+ }
+
+ if( visibilityChange ) {
+ document.addEventListener( visibilityChange, onPageVisibilityChange, false );
+ }
+ }
+
+ // Listen to both touch and click events, in case the device
+ // supports both
+ var pointerEvents = [ 'touchstart', 'click' ];
+
+ // Only support touch for Android, fixes double navigations in
+ // stock browser
+ if( UA.match( /android/gi ) ) {
+ pointerEvents = [ 'touchstart' ];
+ }
+
+ pointerEvents.forEach( function( eventName ) {
+ dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
+ dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
+ dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
+ dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
+ dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
+ dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
+ } );
+
+ }
+
+ /**
+ * Unbinds all event listeners.
+ */
+ function removeEventListeners() {
+
+ eventsAreBound = false;
+
+ document.removeEventListener( 'keydown', onDocumentKeyDown, false );
+ document.removeEventListener( 'keypress', onDocumentKeyPress, false );
+ window.removeEventListener( 'hashchange', onWindowHashChange, false );
+ window.removeEventListener( 'resize', onWindowResize, false );
+
+ dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
+ dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
+ dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
+
+ dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
+ dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
+ dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
+
+ dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
+ dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
+ dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
+
+ dom.pauseOverlay.removeEventListener( 'click', resume, false );
+
+ if ( config.progress && dom.progress ) {
+ dom.progress.removeEventListener( 'click', onProgressClicked, false );
+ }
+
+ [ 'touchstart', 'click' ].forEach( function( eventName ) {
+ dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
+ dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
+ dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
+ dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
+ dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
+ dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
+ } );
+
+ }
+
+ /**
+ * Registers a new plugin with this reveal.js instance.
+ *
+ * reveal.js waits for all regisered plugins to initialize
+ * before considering itself ready, as long as the plugin
+ * is registered before calling `Reveal.initialize()`.
+ */
+ function registerPlugin( id, plugin ) {
+
+ if( plugins[id] === undefined ) {
+ plugins[id] = plugin;
+
+ // If a plugin is registered after reveal.js is loaded,
+ // initialize it right away
+ if( loaded && typeof plugin.init === 'function' ) {
+ plugin.init();
+ }
+ }
+ else {
+ console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
+ }
+
+ }
+
+ /**
+ * Checks if a specific plugin has been registered.
+ *
+ * @param {String} id Unique plugin identifier
+ */
+ function hasPlugin( id ) {
+
+ return !!plugins[id];
+
+ }
+
+ /**
+ * Returns the specific plugin instance, if a plugin
+ * with the given ID has been registered.
+ *
+ * @param {String} id Unique plugin identifier
+ */
+ function getPlugin( id ) {
+
+ return plugins[id];
+
+ }
+
+ /**
+ * Add a custom key binding with optional description to
+ * be added to the help screen.
+ */
+ function addKeyBinding( binding, callback ) {
+
+ if( typeof binding === 'object' && binding.keyCode ) {
+ registeredKeyBindings[binding.keyCode] = {
+ callback: callback,
+ key: binding.key,
+ description: binding.description
+ };
+ }
+ else {
+ registeredKeyBindings[binding] = {
+ callback: callback,
+ key: null,
+ description: null
+ };
+ }
+
+ }
+
+ /**
+ * Removes the specified custom key binding.
+ */
+ function removeKeyBinding( keyCode ) {
+
+ delete registeredKeyBindings[keyCode];
+
+ }
+
+ /**
+ * Extend object a with the properties of object b.
+ * If there's a conflict, object b takes precedence.
+ *
+ * @param {object} a
+ * @param {object} b
+ */
+ function extend( a, b ) {
+
+ for( var i in b ) {
+ a[ i ] = b[ i ];
+ }
+
+ return a;
+
+ }
+
+ /**
+ * Converts the target object to an array.
+ *
+ * @param {object} o
+ * @return {object[]}
+ */
+ function toArray( o ) {
+
+ return Array.prototype.slice.call( o );
+
+ }
+
+ /**
+ * Utility for deserializing a value.
+ *
+ * @param {*} value
+ * @return {*}
+ */
+ function deserialize( value ) {
+
+ if( typeof value === 'string' ) {
+ if( value === 'null' ) return null;
+ else if( value === 'true' ) return true;
+ else if( value === 'false' ) return false;
+ else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
+ }
+
+ return value;
+
+ }
+
+ /**
+ * Measures the distance in pixels between point a
+ * and point b.
+ *
+ * @param {object} a point with x/y properties
+ * @param {object} b point with x/y properties
+ *
+ * @return {number}
+ */
+ function distanceBetween( a, b ) {
+
+ var dx = a.x - b.x,
+ dy = a.y - b.y;
+
+ return Math.sqrt( dx*dx + dy*dy );
+
+ }
+
+ /**
+ * Applies a CSS transform to the target element.
+ *
+ * @param {HTMLElement} element
+ * @param {string} transform
+ */
+ function transformElement( element, transform ) {
+
+ element.style.WebkitTransform = transform;
+ element.style.MozTransform = transform;
+ element.style.msTransform = transform;
+ element.style.transform = transform;
+
+ }
+
+ /**
+ * Applies CSS transforms to the slides container. The container
+ * is transformed from two separate sources: layout and the overview
+ * mode.
+ *
+ * @param {object} transforms
+ */
+ function transformSlides( transforms ) {
+
+ // Pick up new transforms from arguments
+ if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
+ if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
+
+ // Apply the transforms to the slides container
+ if( slidesTransform.layout ) {
+ transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
+ }
+ else {
+ transformElement( dom.slides, slidesTransform.overview );
+ }
+
+ }
+
+ /**
+ * Injects the given CSS styles into the DOM.
+ *
+ * @param {string} value
+ */
+ function injectStyleSheet( value ) {
+
+ var tag = document.createElement( 'style' );
+ tag.type = 'text/css';
+ if( tag.styleSheet ) {
+ tag.styleSheet.cssText = value;
+ }
+ else {
+ tag.appendChild( document.createTextNode( value ) );
+ }
+ document.getElementsByTagName( 'head' )[0].appendChild( tag );
+
+ }
+
+ /**
+ * Find the closest parent that matches the given
+ * selector.
+ *
+ * @param {HTMLElement} target The child element
+ * @param {String} selector The CSS selector to match
+ * the parents against
+ *
+ * @return {HTMLElement} The matched parent or null
+ * if no matching parent was found
+ */
+ function closestParent( target, selector ) {
+
+ var parent = target.parentNode;
+
+ while( parent ) {
+
+ // There's some overhead doing this each time, we don't
+ // want to rewrite the element prototype but should still
+ // be enough to feature detect once at startup...
+ var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
+
+ // If we find a match, we're all set
+ if( matchesMethod && matchesMethod.call( parent, selector ) ) {
+ return parent;
+ }
+
+ // Keep searching
+ parent = parent.parentNode;
+
+ }
+
+ return null;
+
+ }
+
+ /**
+ * Converts various color input formats to an {r:0,g:0,b:0} object.
+ *
+ * @param {string} color The string representation of a color
+ * @example
+ * colorToRgb('#000');
+ * @example
+ * colorToRgb('#000000');
+ * @example
+ * colorToRgb('rgb(0,0,0)');
+ * @example
+ * colorToRgb('rgba(0,0,0)');
+ *
+ * @return {{r: number, g: number, b: number, [a]: number}|null}
+ */
+ function colorToRgb( color ) {
+
+ var hex3 = color.match( /^#([0-9a-f]{3})$/i );
+ if( hex3 && hex3[1] ) {
+ hex3 = hex3[1];
+ return {
+ r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
+ g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
+ b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
+ };
+ }
+
+ var hex6 = color.match( /^#([0-9a-f]{6})$/i );
+ if( hex6 && hex6[1] ) {
+ hex6 = hex6[1];
+ return {
+ r: parseInt( hex6.substr( 0, 2 ), 16 ),
+ g: parseInt( hex6.substr( 2, 2 ), 16 ),
+ b: parseInt( hex6.substr( 4, 2 ), 16 )
+ };
+ }
+
+ var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
+ if( rgb ) {
+ return {
+ r: parseInt( rgb[1], 10 ),
+ g: parseInt( rgb[2], 10 ),
+ b: parseInt( rgb[3], 10 )
+ };
+ }
+
+ var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
+ if( rgba ) {
+ return {
+ r: parseInt( rgba[1], 10 ),
+ g: parseInt( rgba[2], 10 ),
+ b: parseInt( rgba[3], 10 ),
+ a: parseFloat( rgba[4] )
+ };
+ }
+
+ return null;
+
+ }
+
+ /**
+ * Calculates brightness on a scale of 0-255.
+ *
+ * @param {string} color See colorToRgb for supported formats.
+ * @see {@link colorToRgb}
+ */
+ function colorBrightness( color ) {
+
+ if( typeof color === 'string' ) color = colorToRgb( color );
+
+ if( color ) {
+ return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
+ }
+
+ return null;
+
+ }
+
+ /**
+ * Returns the remaining height within the parent of the
+ * target element.
+ *
+ * remaining height = [ configured parent height ] - [ current parent height ]
+ *
+ * @param {HTMLElement} element
+ * @param {number} [height]
+ */
+ function getRemainingHeight( element, height ) {
+
+ height = height || 0;
+
+ if( element ) {
+ var newHeight, oldHeight = element.style.height;
+
+ // Change the .stretch element height to 0 in order find the height of all
+ // the other elements
+ element.style.height = '0px';
+
+ // In Overview mode, the parent (.slide) height is set of 700px.
+ // Restore it temporarily to its natural height.
+ element.parentNode.style.height = 'auto';
+
+ newHeight = height - element.parentNode.offsetHeight;
+
+ // Restore the old height, just in case
+ element.style.height = oldHeight + 'px';
+
+ // Clear the parent (.slide) height. .removeProperty works in IE9+
+ element.parentNode.style.removeProperty('height');
+
+ return newHeight;
+ }
+
+ return height;
+
+ }
+
+ /**
+ * Checks if this instance is being used to print a PDF.
+ */
+ function isPrintingPDF() {
+
+ return ( /print-pdf/gi ).test( window.location.search );
+
+ }
+
+ /**
+ * Hides the address bar if we're on a mobile device.
+ */
+ function hideAddressBar() {
+
+ if( config.hideAddressBar && isMobileDevice ) {
+ // Events that should trigger the address bar to hide
+ window.addEventListener( 'load', removeAddressBar, false );
+ window.addEventListener( 'orientationchange', removeAddressBar, false );
+ }
+
+ }
+
+ /**
+ * Causes the address bar to hide on mobile devices,
+ * more vertical space ftw.
+ */
+ function removeAddressBar() {
+
+ setTimeout( function() {
+ window.scrollTo( 0, 1 );
+ }, 10 );
+
+ }
+
+ /**
+ * Dispatches an event of the specified type from the
+ * reveal DOM element.
+ */
+ function dispatchEvent( type, args ) {
+
+ var event = document.createEvent( 'HTMLEvents', 1, 2 );
+ event.initEvent( type, true, true );
+ extend( event, args );
+ dom.wrapper.dispatchEvent( event );
+
+ // If we're in an iframe, post each reveal.js event to the
+ // parent window. Used by the notes plugin
+ dispatchPostMessage( type );
+
+ }
+
+ /**
+ * Dispatched a postMessage of the given type from our window.
+ */
+ function dispatchPostMessage( type, data ) {
+
+ if( config.postMessageEvents && window.parent !== window.self ) {
+ var message = {
+ namespace: 'reveal',
+ eventName: type,
+ state: getState()
+ };
+
+ extend( message, data );
+
+ window.parent.postMessage( JSON.stringify( message ), '*' );
+ }
+
+ }
+
+ /**
+ * Wrap all links in 3D goodness.
+ */
+ function enableRollingLinks() {
+
+ if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
+ var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
+
+ for( var i = 0, len = anchors.length; i < len; i++ ) {
+ var anchor = anchors[i];
+
+ if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
+ var span = document.createElement('span');
+ span.setAttribute('data-title', anchor.text);
+ span.innerHTML = anchor.innerHTML;
+
+ anchor.classList.add( 'roll' );
+ anchor.innerHTML = '';
+ anchor.appendChild(span);
+ }
+ }
+ }
+
+ }
+
+ /**
+ * Unwrap all 3D links.
+ */
+ function disableRollingLinks() {
+
+ var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
+
+ for( var i = 0, len = anchors.length; i < len; i++ ) {
+ var anchor = anchors[i];
+ var span = anchor.querySelector( 'span' );
+
+ if( span ) {
+ anchor.classList.remove( 'roll' );
+ anchor.innerHTML = span.innerHTML;
+ }
+ }
+
+ }
+
+ /**
+ * Bind preview frame links.
+ *
+ * @param {string} [selector=a] - selector for anchors
+ */
+ function enablePreviewLinks( selector ) {
+
+ var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
+
+ anchors.forEach( function( element ) {
+ if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
+ element.addEventListener( 'click', onPreviewLinkClicked, false );
+ }
+ } );
+
+ }
+
+ /**
+ * Unbind preview frame links.
+ */
+ function disablePreviewLinks( selector ) {
+
+ var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
+
+ anchors.forEach( function( element ) {
+ if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
+ element.removeEventListener( 'click', onPreviewLinkClicked, false );
+ }
+ } );
+
+ }
+
+ /**
+ * Opens a preview window for the target URL.
+ *
+ * @param {string} url - url for preview iframe src
+ */
+ function showPreview( url ) {
+
+ closeOverlay();
+
+ dom.overlay = document.createElement( 'div' );
+ dom.overlay.classList.add( 'overlay' );
+ dom.overlay.classList.add( 'overlay-preview' );
+ dom.wrapper.appendChild( dom.overlay );
+
+ dom.overlay.innerHTML = [
+ '',
+ '',
+ '',
+ ' ',
+ '',
+ ' '
+ ].join('');
+
+ dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
+ dom.overlay.classList.add( 'loaded' );
+ }, false );
+
+ dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
+ closeOverlay();
+ event.preventDefault();
+ }, false );
+
+ dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
+ closeOverlay();
+ }, false );
+
+ setTimeout( function() {
+ dom.overlay.classList.add( 'visible' );
+ }, 1 );
+
+ }
+
+ /**
+ * Open or close help overlay window.
+ *
+ * @param {Boolean} [override] Flag which overrides the
+ * toggle logic and forcibly sets the desired state. True means
+ * help is open, false means it's closed.
+ */
+ function toggleHelp( override ){
+
+ if( typeof override === 'boolean' ) {
+ override ? showHelp() : closeOverlay();
+ }
+ else {
+ if( dom.overlay ) {
+ closeOverlay();
+ }
+ else {
+ showHelp();
+ }
+ }
+ }
+
+ /**
+ * Opens an overlay window with help material.
+ */
+ function showHelp() {
+
+ if( config.help ) {
+
+ closeOverlay();
+
+ dom.overlay = document.createElement( 'div' );
+ dom.overlay.classList.add( 'overlay' );
+ dom.overlay.classList.add( 'overlay-help' );
+ dom.wrapper.appendChild( dom.overlay );
+
+ var html = 'Keyboard Shortcuts
';
+
+ html += 'KEY ACTION ';
+ for( var key in keyboardShortcuts ) {
+ html += '' + key + ' ' + keyboardShortcuts[ key ] + ' ';
+ }
+
+ // Add custom key bindings that have associated descriptions
+ for( var binding in registeredKeyBindings ) {
+ if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
+ html += '' + registeredKeyBindings[binding].key + ' ' + registeredKeyBindings[binding].description + ' ';
+ }
+ }
+
+ html += '
';
+
+ dom.overlay.innerHTML = [
+ '',
+ '',
+ ' ',
+ ' '
+ ].join('');
+
+ dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
+ closeOverlay();
+ event.preventDefault();
+ }, false );
+
+ setTimeout( function() {
+ dom.overlay.classList.add( 'visible' );
+ }, 1 );
+
+ }
+
+ }
+
+ /**
+ * Closes any currently open overlay.
+ */
+ function closeOverlay() {
+
+ if( dom.overlay ) {
+ dom.overlay.parentNode.removeChild( dom.overlay );
+ dom.overlay = null;
+ }
+
+ }
+
+ /**
+ * Applies JavaScript-controlled layout rules to the
+ * presentation.
+ */
+ function layout() {
+
+ if( dom.wrapper && !isPrintingPDF() ) {
+
+ if( !config.disableLayout ) {
+
+ // On some mobile devices '100vh' is taller than the visible
+ // viewport which leads to part of the presentation being
+ // cut off. To work around this we define our own '--vh' custom
+ // property where 100x adds up to the correct height.
+ //
+ // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
+ if( isMobileDevice ) {
+ document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
+ }
+
+ var size = getComputedSlideSize();
+
+ var oldScale = scale;
+
+ // Layout the contents of the slides
+ layoutSlideContents( config.width, config.height );
+
+ dom.slides.style.width = size.width + 'px';
+ dom.slides.style.height = size.height + 'px';
+
+ // Determine scale of content to fit within available space
+ scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
+
+ // Respect max/min scale settings
+ scale = Math.max( scale, config.minScale );
+ scale = Math.min( scale, config.maxScale );
+
+ // Don't apply any scaling styles if scale is 1
+ if( scale === 1 ) {
+ dom.slides.style.zoom = '';
+ dom.slides.style.left = '';
+ dom.slides.style.top = '';
+ dom.slides.style.bottom = '';
+ dom.slides.style.right = '';
+ transformSlides( { layout: '' } );
+ }
+ else {
+ // Zoom Scaling
+ // Content remains crisp no matter how much we scale. Side
+ // effects are minor differences in text layout and iframe
+ // viewports changing size. A 200x200 iframe viewport in a
+ // 2x zoomed presentation ends up having a 400x400 viewport.
+ if( scale > 1 && features.zoom && window.devicePixelRatio < 2 ) {
+ dom.slides.style.zoom = scale;
+ dom.slides.style.left = '';
+ dom.slides.style.top = '';
+ dom.slides.style.bottom = '';
+ dom.slides.style.right = '';
+ transformSlides( { layout: '' } );
+ }
+ // Transform Scaling
+ // Content layout remains the exact same when scaled up.
+ // Side effect is content becoming blurred, especially with
+ // high scale values on ldpi screens.
+ else {
+ dom.slides.style.zoom = '';
+ dom.slides.style.left = '50%';
+ dom.slides.style.top = '50%';
+ dom.slides.style.bottom = 'auto';
+ dom.slides.style.right = 'auto';
+ transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
+ }
+ }
+
+ // Select all slides, vertical and horizontal
+ var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
+
+ for( var i = 0, len = slides.length; i < len; i++ ) {
+ var slide = slides[ i ];
+
+ // Don't bother updating invisible slides
+ if( slide.style.display === 'none' ) {
+ continue;
+ }
+
+ if( config.center || slide.classList.contains( 'center' ) ) {
+ // Vertical stacks are not centred since their section
+ // children will be
+ if( slide.classList.contains( 'stack' ) ) {
+ slide.style.top = 0;
+ }
+ else {
+ slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
+ }
+ }
+ else {
+ slide.style.top = '';
+ }
+
+ }
+
+ if( oldScale !== scale ) {
+ dispatchEvent( 'resize', {
+ 'oldScale': oldScale,
+ 'scale': scale,
+ 'size': size
+ } );
+ }
+ }
+
+ updateProgress();
+ updateParallax();
+
+ if( isOverview() ) {
+ updateOverview();
+ }
+
+ }
+
+ }
+
+ /**
+ * Applies layout logic to the contents of all slides in
+ * the presentation.
+ *
+ * @param {string|number} width
+ * @param {string|number} height
+ */
+ function layoutSlideContents( width, height ) {
+
+ // Handle sizing of elements with the 'stretch' class
+ toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
+
+ // Determine how much vertical space we can use
+ var remainingHeight = getRemainingHeight( element, height );
+
+ // Consider the aspect ratio of media elements
+ if( /(img|video)/gi.test( element.nodeName ) ) {
+ var nw = element.naturalWidth || element.videoWidth,
+ nh = element.naturalHeight || element.videoHeight;
+
+ var es = Math.min( width / nw, remainingHeight / nh );
+
+ element.style.width = ( nw * es ) + 'px';
+ element.style.height = ( nh * es ) + 'px';
+
+ }
+ else {
+ element.style.width = width + 'px';
+ element.style.height = remainingHeight + 'px';
+ }
+
+ } );
+
+ }
+
+ /**
+ * Calculates the computed pixel size of our slides. These
+ * values are based on the width and height configuration
+ * options.
+ *
+ * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
+ * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
+ */
+ function getComputedSlideSize( presentationWidth, presentationHeight ) {
+
+ var size = {
+ // Slide size
+ width: config.width,
+ height: config.height,
+
+ // Presentation size
+ presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
+ presentationHeight: presentationHeight || dom.wrapper.offsetHeight
+ };
+
+ // Reduce available space by margin
+ size.presentationWidth -= ( size.presentationWidth * config.margin );
+ size.presentationHeight -= ( size.presentationHeight * config.margin );
+
+ // Slide width may be a percentage of available width
+ if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
+ size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
+ }
+
+ // Slide height may be a percentage of available height
+ if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
+ size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
+ }
+
+ return size;
+
+ }
+
+ /**
+ * Stores the vertical index of a stack so that the same
+ * vertical slide can be selected when navigating to and
+ * from the stack.
+ *
+ * @param {HTMLElement} stack The vertical stack element
+ * @param {string|number} [v=0] Index to memorize
+ */
+ function setPreviousVerticalIndex( stack, v ) {
+
+ if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
+ stack.setAttribute( 'data-previous-indexv', v || 0 );
+ }
+
+ }
+
+ /**
+ * Retrieves the vertical index which was stored using
+ * #setPreviousVerticalIndex() or 0 if no previous index
+ * exists.
+ *
+ * @param {HTMLElement} stack The vertical stack element
+ */
+ function getPreviousVerticalIndex( stack ) {
+
+ if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
+ // Prefer manually defined start-indexv
+ var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
+
+ return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
+ }
+
+ return 0;
+
+ }
+
+ /**
+ * Displays the overview of slides (quick nav) by scaling
+ * down and arranging all slide elements.
+ */
+ function activateOverview() {
+
+ // Only proceed if enabled in config
+ if( config.overview && !isOverview() ) {
+
+ overview = true;
+
+ dom.wrapper.classList.add( 'overview' );
+ dom.wrapper.classList.remove( 'overview-deactivating' );
+
+ if( features.overviewTransitions ) {
+ setTimeout( function() {
+ dom.wrapper.classList.add( 'overview-animated' );
+ }, 1 );
+ }
+
+ // Don't auto-slide while in overview mode
+ cancelAutoSlide();
+
+ // Move the backgrounds element into the slide container to
+ // that the same scaling is applied
+ dom.slides.appendChild( dom.background );
+
+ // Clicking on an overview slide navigates to it
+ toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+ if( !slide.classList.contains( 'stack' ) ) {
+ slide.addEventListener( 'click', onOverviewSlideClicked, true );
+ }
+ } );
+
+ // Calculate slide sizes
+ var margin = 70;
+ var slideSize = getComputedSlideSize();
+ overviewSlideWidth = slideSize.width + margin;
+ overviewSlideHeight = slideSize.height + margin;
+
+ // Reverse in RTL mode
+ if( config.rtl ) {
+ overviewSlideWidth = -overviewSlideWidth;
+ }
+
+ updateSlidesVisibility();
+ layoutOverview();
+ updateOverview();
+
+ layout();
+
+ // Notify observers of the overview showing
+ dispatchEvent( 'overviewshown', {
+ 'indexh': indexh,
+ 'indexv': indexv,
+ 'currentSlide': currentSlide
+ } );
+
+ }
+
+ }
+
+ /**
+ * Uses CSS transforms to position all slides in a grid for
+ * display inside of the overview mode.
+ */
+ function layoutOverview() {
+
+ // Layout slides
+ toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
+ hslide.setAttribute( 'data-index-h', h );
+ transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
+
+ if( hslide.classList.contains( 'stack' ) ) {
+
+ toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
+ vslide.setAttribute( 'data-index-h', h );
+ vslide.setAttribute( 'data-index-v', v );
+
+ transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
+ } );
+
+ }
+ } );
+
+ // Layout slide backgrounds
+ toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
+ transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
+
+ toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
+ transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
+ } );
+ } );
+
+ }
+
+ /**
+ * Moves the overview viewport to the current slides.
+ * Called each time the current slide changes.
+ */
+ function updateOverview() {
+
+ var vmin = Math.min( window.innerWidth, window.innerHeight );
+ var scale = Math.max( vmin / 5, 150 ) / vmin;
+
+ transformSlides( {
+ overview: [
+ 'scale('+ scale +')',
+ 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
+ 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
+ ].join( ' ' )
+ } );
+
+ }
+
+ /**
+ * Exits the slide overview and enters the currently
+ * active slide.
+ */
+ function deactivateOverview() {
+
+ // Only proceed if enabled in config
+ if( config.overview ) {
+
+ overview = false;
+
+ dom.wrapper.classList.remove( 'overview' );
+ dom.wrapper.classList.remove( 'overview-animated' );
+
+ // Temporarily add a class so that transitions can do different things
+ // depending on whether they are exiting/entering overview, or just
+ // moving from slide to slide
+ dom.wrapper.classList.add( 'overview-deactivating' );
+
+ setTimeout( function () {
+ dom.wrapper.classList.remove( 'overview-deactivating' );
+ }, 1 );
+
+ // Move the background element back out
+ dom.wrapper.appendChild( dom.background );
+
+ // Clean up changes made to slides
+ toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+ transformElement( slide, '' );
+
+ slide.removeEventListener( 'click', onOverviewSlideClicked, true );
+ } );
+
+ // Clean up changes made to backgrounds
+ toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
+ transformElement( background, '' );
+ } );
+
+ transformSlides( { overview: '' } );
+
+ slide( indexh, indexv );
+
+ layout();
+
+ cueAutoSlide();
+
+ // Notify observers of the overview hiding
+ dispatchEvent( 'overviewhidden', {
+ 'indexh': indexh,
+ 'indexv': indexv,
+ 'currentSlide': currentSlide
+ } );
+
+ }
+ }
+
+ /**
+ * Toggles the slide overview mode on and off.
+ *
+ * @param {Boolean} [override] Flag which overrides the
+ * toggle logic and forcibly sets the desired state. True means
+ * overview is open, false means it's closed.
+ */
+ function toggleOverview( override ) {
+
+ if( typeof override === 'boolean' ) {
+ override ? activateOverview() : deactivateOverview();
+ }
+ else {
+ isOverview() ? deactivateOverview() : activateOverview();
+ }
+
+ }
+
+ /**
+ * Checks if the overview is currently active.
+ *
+ * @return {Boolean} true if the overview is active,
+ * false otherwise
+ */
+ function isOverview() {
+
+ return overview;
+
+ }
+
+ /**
+ * Return a hash URL that will resolve to the current slide location.
+ */
+ function locationHash() {
+
+ var url = '/';
+
+ // Attempt to create a named link based on the slide's ID
+ var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
+ if( id ) {
+ id = encodeURIComponent( id );
+ }
+
+ var indexf;
+ if( config.fragmentInURL ) {
+ indexf = getIndices().f;
+ }
+
+ // If the current slide has an ID, use that as a named link,
+ // but we don't support named links with a fragment index
+ if( typeof id === 'string' && id.length && indexf === undefined ) {
+ url = '/' + id;
+ }
+ // Otherwise use the /h/v index
+ else {
+ var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+ if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
+ if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
+ if( indexf !== undefined ) url += '/' + indexf;
+ }
+
+ return url;
+
+ }
+
+ /**
+ * Checks if the current or specified slide is vertical
+ * (nested within another slide).
+ *
+ * @param {HTMLElement} [slide=currentSlide] The slide to check
+ * orientation of
+ * @return {Boolean}
+ */
+ function isVerticalSlide( slide ) {
+
+ // Prefer slide argument, otherwise use current slide
+ slide = slide ? slide : currentSlide;
+
+ return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
+
+ }
+
+ /**
+ * Handling the fullscreen functionality via the fullscreen API
+ *
+ * @see http://fullscreen.spec.whatwg.org/
+ * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
+ */
+ function enterFullscreen() {
+
+ var element = document.documentElement;
+
+ // Check which implementation is available
+ var requestMethod = element.requestFullscreen ||
+ element.webkitRequestFullscreen ||
+ element.webkitRequestFullScreen ||
+ element.mozRequestFullScreen ||
+ element.msRequestFullscreen;
+
+ if( requestMethod ) {
+ requestMethod.apply( element );
+ }
+
+ }
+
+ /**
+ * Shows the mouse pointer after it has been hidden with
+ * #hideCursor.
+ */
+ function showCursor() {
+
+ if( cursorHidden ) {
+ cursorHidden = false;
+ dom.wrapper.style.cursor = '';
+ }
+
+ }
+
+ /**
+ * Hides the mouse pointer when it's on top of the .reveal
+ * container.
+ */
+ function hideCursor() {
+
+ if( cursorHidden === false ) {
+ cursorHidden = true;
+ dom.wrapper.style.cursor = 'none';
+ }
+
+ }
+
+ /**
+ * Enters the paused mode which fades everything on screen to
+ * black.
+ */
+ function pause() {
+
+ if( config.pause ) {
+ var wasPaused = dom.wrapper.classList.contains( 'paused' );
+
+ cancelAutoSlide();
+ dom.wrapper.classList.add( 'paused' );
+
+ if( wasPaused === false ) {
+ dispatchEvent( 'paused' );
+ }
+ }
+
+ }
+
+ /**
+ * Exits from the paused mode.
+ */
+ function resume() {
+
+ var wasPaused = dom.wrapper.classList.contains( 'paused' );
+ dom.wrapper.classList.remove( 'paused' );
+
+ cueAutoSlide();
+
+ if( wasPaused ) {
+ dispatchEvent( 'resumed' );
+ }
+
+ }
+
+ /**
+ * Toggles the paused mode on and off.
+ */
+ function togglePause( override ) {
+
+ if( typeof override === 'boolean' ) {
+ override ? pause() : resume();
+ }
+ else {
+ isPaused() ? resume() : pause();
+ }
+
+ }
+
+ /**
+ * Checks if we are currently in the paused mode.
+ *
+ * @return {Boolean}
+ */
+ function isPaused() {
+
+ return dom.wrapper.classList.contains( 'paused' );
+
+ }
+
+ /**
+ * Toggles the auto slide mode on and off.
+ *
+ * @param {Boolean} [override] Flag which sets the desired state.
+ * True means autoplay starts, false means it stops.
+ */
+
+ function toggleAutoSlide( override ) {
+
+ if( typeof override === 'boolean' ) {
+ override ? resumeAutoSlide() : pauseAutoSlide();
+ }
+
+ else {
+ autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
+ }
+
+ }
+
+ /**
+ * Checks if the auto slide mode is currently on.
+ *
+ * @return {Boolean}
+ */
+ function isAutoSliding() {
+
+ return !!( autoSlide && !autoSlidePaused );
+
+ }
+
+ /**
+ * Steps from the current point in the presentation to the
+ * slide which matches the specified horizontal and vertical
+ * indices.
+ *
+ * @param {number} [h=indexh] Horizontal index of the target slide
+ * @param {number} [v=indexv] Vertical index of the target slide
+ * @param {number} [f] Index of a fragment within the
+ * target slide to activate
+ * @param {number} [o] Origin for use in multimaster environments
+ */
+ function slide( h, v, f, o ) {
+
+ // Remember where we were at before
+ previousSlide = currentSlide;
+
+ // Query all horizontal slides in the deck
+ var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
+
+ // Abort if there are no slides
+ if( horizontalSlides.length === 0 ) return;
+
+ // If no vertical index is specified and the upcoming slide is a
+ // stack, resume at its previous vertical index
+ if( v === undefined && !isOverview() ) {
+ v = getPreviousVerticalIndex( horizontalSlides[ h ] );
+ }
+
+ // If we were on a vertical stack, remember what vertical index
+ // it was on so we can resume at the same position when returning
+ if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
+ setPreviousVerticalIndex( previousSlide.parentNode, indexv );
+ }
+
+ // Remember the state before this slide
+ var stateBefore = state.concat();
+
+ // Reset the state array
+ state.length = 0;
+
+ var indexhBefore = indexh || 0,
+ indexvBefore = indexv || 0;
+
+ // Activate and transition to the new slide
+ indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
+ indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
+
+ // Update the visibility of slides now that the indices have changed
+ updateSlidesVisibility();
+
+ layout();
+
+ // Update the overview if it's currently active
+ if( isOverview() ) {
+ updateOverview();
+ }
+
+ // Find the current horizontal slide and any possible vertical slides
+ // within it
+ var currentHorizontalSlide = horizontalSlides[ indexh ],
+ currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
+
+ // Store references to the previous and current slides
+ currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
+
+ // Show fragment, if specified
+ if( typeof f !== 'undefined' ) {
+ navigateFragment( f );
+ }
+
+ // Dispatch an event if the slide changed
+ var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
+ if (!slideChanged) {
+ // Ensure that the previous slide is never the same as the current
+ previousSlide = null;
+ }
+
+ // Solves an edge case where the previous slide maintains the
+ // 'present' class when navigating between adjacent vertical
+ // stacks
+ if( previousSlide && previousSlide !== currentSlide ) {
+ previousSlide.classList.remove( 'present' );
+ previousSlide.setAttribute( 'aria-hidden', 'true' );
+
+ // Reset all slides upon navigate to home
+ // Issue: #285
+ if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
+ // Launch async task
+ setTimeout( function () {
+ var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
+ for( i in slides ) {
+ if( slides[i] ) {
+ // Reset stack
+ setPreviousVerticalIndex( slides[i], 0 );
+ }
+ }
+ }, 0 );
+ }
+ }
+
+ // Apply the new state
+ stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
+ // Check if this state existed on the previous slide. If it
+ // did, we will avoid adding it repeatedly
+ for( var j = 0; j < stateBefore.length; j++ ) {
+ if( stateBefore[j] === state[i] ) {
+ stateBefore.splice( j, 1 );
+ continue stateLoop;
+ }
+ }
+
+ document.documentElement.classList.add( state[i] );
+
+ // Dispatch custom event matching the state's name
+ dispatchEvent( state[i] );
+ }
+
+ // Clean up the remains of the previous state
+ while( stateBefore.length ) {
+ document.documentElement.classList.remove( stateBefore.pop() );
+ }
+
+ if( slideChanged ) {
+ dispatchEvent( 'slidechanged', {
+ 'indexh': indexh,
+ 'indexv': indexv,
+ 'previousSlide': previousSlide,
+ 'currentSlide': currentSlide,
+ 'origin': o
+ } );
+ }
+
+ // Handle embedded content
+ if( slideChanged || !previousSlide ) {
+ stopEmbeddedContent( previousSlide );
+ startEmbeddedContent( currentSlide );
+ }
+
+ // Announce the current slide contents, for screen readers
+ dom.statusDiv.textContent = getStatusText( currentSlide );
+
+ updateControls();
+ updateProgress();
+ updateBackground();
+ updateParallax();
+ updateSlideNumber();
+ updateNotes();
+ updateFragments();
+
+ // Update the URL hash
+ writeURL();
+
+ cueAutoSlide();
+
+ }
+
+ /**
+ * Syncs the presentation with the current DOM. Useful
+ * when new slides or control elements are added or when
+ * the configuration has changed.
+ */
+ function sync() {
+
+ // Subscribe to input
+ removeEventListeners();
+ addEventListeners();
+
+ // Force a layout to make sure the current config is accounted for
+ layout();
+
+ // Reflect the current autoSlide value
+ autoSlide = config.autoSlide;
+
+ // Start auto-sliding if it's enabled
+ cueAutoSlide();
+
+ // Re-create the slide backgrounds
+ createBackgrounds();
+
+ // Write the current hash to the URL
+ writeURL();
+
+ sortAllFragments();
+
+ updateControls();
+ updateProgress();
+ updateSlideNumber();
+ updateSlidesVisibility();
+ updateBackground( true );
+ updateNotesVisibility();
+ updateNotes();
+
+ formatEmbeddedContent();
+
+ // Start or stop embedded content depending on global config
+ if( config.autoPlayMedia === false ) {
+ stopEmbeddedContent( currentSlide, { unloadIframes: false } );
+ }
+ else {
+ startEmbeddedContent( currentSlide );
+ }
+
+ if( isOverview() ) {
+ layoutOverview();
+ }
+
+ }
+
+ /**
+ * Updates reveal.js to keep in sync with new slide attributes. For
+ * example, if you add a new `data-background-image` you can call
+ * this to have reveal.js render the new background image.
+ *
+ * Similar to #sync() but more efficient when you only need to
+ * refresh a specific slide.
+ *
+ * @param {HTMLElement} slide
+ */
+ function syncSlide( slide ) {
+
+ // Default to the current slide
+ slide = slide || currentSlide;
+
+ syncBackground( slide );
+ syncFragments( slide );
+
+ updateBackground();
+ updateNotes();
+
+ loadSlide( slide );
+
+ }
+
+ /**
+ * Formats the fragments on the given slide so that they have
+ * valid indices. Call this if fragments are changed in the DOM
+ * after reveal.js has already initialized.
+ *
+ * @param {HTMLElement} slide
+ * @return {Array} a list of the HTML fragments that were synced
+ */
+ function syncFragments( slide ) {
+
+ // Default to the current slide
+ slide = slide || currentSlide;
+
+ return sortFragments( slide.querySelectorAll( '.fragment' ) );
+
+ }
+
+ /**
+ * Resets all vertical slides so that only the first
+ * is visible.
+ */
+ function resetVerticalSlides() {
+
+ var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+ horizontalSlides.forEach( function( horizontalSlide ) {
+
+ var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
+ verticalSlides.forEach( function( verticalSlide, y ) {
+
+ if( y > 0 ) {
+ verticalSlide.classList.remove( 'present' );
+ verticalSlide.classList.remove( 'past' );
+ verticalSlide.classList.add( 'future' );
+ verticalSlide.setAttribute( 'aria-hidden', 'true' );
+ }
+
+ } );
+
+ } );
+
+ }
+
+ /**
+ * Sorts and formats all of fragments in the
+ * presentation.
+ */
+ function sortAllFragments() {
+
+ var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+ horizontalSlides.forEach( function( horizontalSlide ) {
+
+ var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
+ verticalSlides.forEach( function( verticalSlide, y ) {
+
+ sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
+
+ } );
+
+ if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
+
+ } );
+
+ }
+
+ /**
+ * Randomly shuffles all slides in the deck.
+ */
+ function shuffle() {
+
+ var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+
+ slides.forEach( function( slide ) {
+
+ // Insert this slide next to another random slide. This may
+ // cause the slide to insert before itself but that's fine.
+ dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
+
+ } );
+
+ }
+
+ /**
+ * Updates one dimension of slides by showing the slide
+ * with the specified index.
+ *
+ * @param {string} selector A CSS selector that will fetch
+ * the group of slides we are working with
+ * @param {number} index The index of the slide that should be
+ * shown
+ *
+ * @return {number} The index of the slide that is now shown,
+ * might differ from the passed in index if it was out of
+ * bounds.
+ */
+ function updateSlides( selector, index ) {
+
+ // Select all slides and convert the NodeList result to
+ // an array
+ var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
+ slidesLength = slides.length;
+
+ var printMode = isPrintingPDF();
+
+ if( slidesLength ) {
+
+ // Should the index loop?
+ if( config.loop ) {
+ index %= slidesLength;
+
+ if( index < 0 ) {
+ index = slidesLength + index;
+ }
+ }
+
+ // Enforce max and minimum index bounds
+ index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
+
+ for( var i = 0; i < slidesLength; i++ ) {
+ var element = slides[i];
+
+ var reverse = config.rtl && !isVerticalSlide( element );
+
+ element.classList.remove( 'past' );
+ element.classList.remove( 'present' );
+ element.classList.remove( 'future' );
+
+ // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
+ element.setAttribute( 'hidden', '' );
+ element.setAttribute( 'aria-hidden', 'true' );
+
+ // If this element contains vertical slides
+ if( element.querySelector( 'section' ) ) {
+ element.classList.add( 'stack' );
+ }
+
+ // If we're printing static slides, all slides are "present"
+ if( printMode ) {
+ element.classList.add( 'present' );
+ continue;
+ }
+
+ if( i < index ) {
+ // Any element previous to index is given the 'past' class
+ element.classList.add( reverse ? 'future' : 'past' );
+
+ if( config.fragments ) {
+ // Show all fragments in prior slides
+ toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
+ fragment.classList.add( 'visible' );
+ fragment.classList.remove( 'current-fragment' );
+ } );
+ }
+ }
+ else if( i > index ) {
+ // Any element subsequent to index is given the 'future' class
+ element.classList.add( reverse ? 'past' : 'future' );
+
+ if( config.fragments ) {
+ // Hide all fragments in future slides
+ toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
+ fragment.classList.remove( 'visible' );
+ fragment.classList.remove( 'current-fragment' );
+ } );
+ }
+ }
+ }
+
+ // Mark the current slide as present
+ slides[index].classList.add( 'present' );
+ slides[index].removeAttribute( 'hidden' );
+ slides[index].removeAttribute( 'aria-hidden' );
+
+ // If this slide has a state associated with it, add it
+ // onto the current state of the deck
+ var slideState = slides[index].getAttribute( 'data-state' );
+ if( slideState ) {
+ state = state.concat( slideState.split( ' ' ) );
+ }
+
+ }
+ else {
+ // Since there are no slides we can't be anywhere beyond the
+ // zeroth index
+ index = 0;
+ }
+
+ return index;
+
+ }
+
+ /**
+ * Optimization method; hide all slides that are far away
+ * from the present slide.
+ */
+ function updateSlidesVisibility() {
+
+ // Select all slides and convert the NodeList result to
+ // an array
+ var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
+ horizontalSlidesLength = horizontalSlides.length,
+ distanceX,
+ distanceY;
+
+ if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
+
+ // The number of steps away from the present slide that will
+ // be visible
+ var viewDistance = isOverview() ? 10 : config.viewDistance;
+
+ // Limit view distance on weaker devices
+ if( isMobileDevice ) {
+ viewDistance = isOverview() ? 6 : 2;
+ }
+
+ // All slides need to be visible when exporting to PDF
+ if( isPrintingPDF() ) {
+ viewDistance = Number.MAX_VALUE;
+ }
+
+ for( var x = 0; x < horizontalSlidesLength; x++ ) {
+ var horizontalSlide = horizontalSlides[x];
+
+ var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
+ verticalSlidesLength = verticalSlides.length;
+
+ // Determine how far away this slide is from the present
+ distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
+
+ // If the presentation is looped, distance should measure
+ // 1 between the first and last slides
+ if( config.loop ) {
+ distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
+ }
+
+ // Show the horizontal slide if it's within the view distance
+ if( distanceX < viewDistance ) {
+ loadSlide( horizontalSlide );
+ }
+ else {
+ unloadSlide( horizontalSlide );
+ }
+
+ if( verticalSlidesLength ) {
+
+ var oy = getPreviousVerticalIndex( horizontalSlide );
+
+ for( var y = 0; y < verticalSlidesLength; y++ ) {
+ var verticalSlide = verticalSlides[y];
+
+ distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
+
+ if( distanceX + distanceY < viewDistance ) {
+ loadSlide( verticalSlide );
+ }
+ else {
+ unloadSlide( verticalSlide );
+ }
+ }
+
+ }
+ }
+
+ // Flag if there are ANY vertical slides, anywhere in the deck
+ if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
+ dom.wrapper.classList.add( 'has-vertical-slides' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'has-vertical-slides' );
+ }
+
+ // Flag if there are ANY horizontal slides, anywhere in the deck
+ if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
+ dom.wrapper.classList.add( 'has-horizontal-slides' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'has-horizontal-slides' );
+ }
+
+ }
+
+ }
+
+ /**
+ * Pick up notes from the current slide and display them
+ * to the viewer.
+ *
+ * @see {@link config.showNotes}
+ */
+ function updateNotes() {
+
+ if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
+
+ dom.speakerNotes.innerHTML = getSlideNotes() || 'No notes on this slide.';
+
+ }
+
+ }
+
+ /**
+ * Updates the visibility of the speaker notes sidebar that
+ * is used to share annotated slides. The notes sidebar is
+ * only visible if showNotes is true and there are notes on
+ * one or more slides in the deck.
+ */
+ function updateNotesVisibility() {
+
+ if( config.showNotes && hasNotes() ) {
+ dom.wrapper.classList.add( 'show-notes' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'show-notes' );
+ }
+
+ }
+
+ /**
+ * Checks if there are speaker notes for ANY slide in the
+ * presentation.
+ */
+ function hasNotes() {
+
+ return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
+
+ }
+
+ /**
+ * Updates the progress bar to reflect the current slide.
+ */
+ function updateProgress() {
+
+ // Update progress if enabled
+ if( config.progress && dom.progressbar ) {
+
+ dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
+
+ }
+
+ }
+
+
+ /**
+ * Updates the slide number to match the current slide.
+ */
+ function updateSlideNumber() {
+
+ // Update slide number if enabled
+ if( config.slideNumber && dom.slideNumber ) {
+
+ var value;
+ var format = 'h.v';
+
+ if( typeof config.slideNumber === 'function' ) {
+ value = config.slideNumber();
+ }
+ else {
+ // Check if a custom number format is available
+ if( typeof config.slideNumber === 'string' ) {
+ format = config.slideNumber;
+ }
+
+ // If there are ONLY vertical slides in this deck, always use
+ // a flattened slide number
+ if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
+ format = 'c';
+ }
+
+ value = [];
+ switch( format ) {
+ case 'c':
+ value.push( getSlidePastCount() + 1 );
+ break;
+ case 'c/t':
+ value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
+ break;
+ case 'h/v':
+ value.push( indexh + 1 );
+ if( isVerticalSlide() ) value.push( '/', indexv + 1 );
+ break;
+ default:
+ value.push( indexh + 1 );
+ if( isVerticalSlide() ) value.push( '.', indexv + 1 );
+ }
+ }
+
+ dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
+ }
+
+ }
+
+ /**
+ * Applies HTML formatting to a slide number before it's
+ * written to the DOM.
+ *
+ * @param {number} a Current slide
+ * @param {string} delimiter Character to separate slide numbers
+ * @param {(number|*)} b Total slides
+ * @return {string} HTML string fragment
+ */
+ function formatSlideNumber( a, delimiter, b ) {
+
+ var url = '#' + locationHash();
+ if( typeof b === 'number' && !isNaN( b ) ) {
+ return '' +
+ ' ' +
+ ' ' +
+ ' ' +
+ '';
+ }
+ else {
+ return '' +
+ ' ' +
+ '';
+ }
+
+ }
+
+ /**
+ * Updates the state of all control/navigation arrows.
+ */
+ function updateControls() {
+
+ var routes = availableRoutes();
+ var fragments = availableFragments();
+
+ // Remove the 'enabled' class from all directions
+ dom.controlsLeft.concat( dom.controlsRight )
+ .concat( dom.controlsUp )
+ .concat( dom.controlsDown )
+ .concat( dom.controlsPrev )
+ .concat( dom.controlsNext ).forEach( function( node ) {
+ node.classList.remove( 'enabled' );
+ node.classList.remove( 'fragmented' );
+
+ // Set 'disabled' attribute on all directions
+ node.setAttribute( 'disabled', 'disabled' );
+ } );
+
+ // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
+ if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Prev/next buttons
+ if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Highlight fragment directions
+ if( currentSlide ) {
+
+ // Always apply fragment decorator to prev/next buttons
+ if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Apply fragment decorators to directional buttons based on
+ // what slide axis they are in
+ if( isVerticalSlide( currentSlide ) ) {
+ if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ }
+ else {
+ if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ }
+
+ }
+
+ if( config.controlsTutorial ) {
+
+ // Highlight control arrows with an animation to ensure
+ // that the viewer knows how to navigate
+ if( !hasNavigatedDown && routes.down ) {
+ dom.controlsDownArrow.classList.add( 'highlight' );
+ }
+ else {
+ dom.controlsDownArrow.classList.remove( 'highlight' );
+
+ if( !hasNavigatedRight && routes.right && indexv === 0 ) {
+ dom.controlsRightArrow.classList.add( 'highlight' );
+ }
+ else {
+ dom.controlsRightArrow.classList.remove( 'highlight' );
+ }
+ }
+
+ }
+
+ }
+
+ /**
+ * Updates the background elements to reflect the current
+ * slide.
+ *
+ * @param {boolean} includeAll If true, the backgrounds of
+ * all vertical slides (not just the present) will be updated.
+ */
+ function updateBackground( includeAll ) {
+
+ var currentBackground = null;
+
+ // Reverse past/future classes when in RTL mode
+ var horizontalPast = config.rtl ? 'future' : 'past',
+ horizontalFuture = config.rtl ? 'past' : 'future';
+
+ // Update the classes of all backgrounds to match the
+ // states of their slides (past/present/future)
+ toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
+
+ backgroundh.classList.remove( 'past' );
+ backgroundh.classList.remove( 'present' );
+ backgroundh.classList.remove( 'future' );
+
+ if( h < indexh ) {
+ backgroundh.classList.add( horizontalPast );
+ }
+ else if ( h > indexh ) {
+ backgroundh.classList.add( horizontalFuture );
+ }
+ else {
+ backgroundh.classList.add( 'present' );
+
+ // Store a reference to the current background element
+ currentBackground = backgroundh;
+ }
+
+ if( includeAll || h === indexh ) {
+ toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
+
+ backgroundv.classList.remove( 'past' );
+ backgroundv.classList.remove( 'present' );
+ backgroundv.classList.remove( 'future' );
+
+ if( v < indexv ) {
+ backgroundv.classList.add( 'past' );
+ }
+ else if ( v > indexv ) {
+ backgroundv.classList.add( 'future' );
+ }
+ else {
+ backgroundv.classList.add( 'present' );
+
+ // Only if this is the present horizontal and vertical slide
+ if( h === indexh ) currentBackground = backgroundv;
+ }
+
+ } );
+ }
+
+ } );
+
+ // Stop content inside of previous backgrounds
+ if( previousBackground ) {
+
+ stopEmbeddedContent( previousBackground );
+
+ }
+
+ // Start content in the current background
+ if( currentBackground ) {
+
+ startEmbeddedContent( currentBackground );
+
+ var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
+ if( currentBackgroundContent ) {
+
+ var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
+
+ // Restart GIFs (doesn't work in Firefox)
+ if( /\.gif/i.test( backgroundImageURL ) ) {
+ currentBackgroundContent.style.backgroundImage = '';
+ window.getComputedStyle( currentBackgroundContent ).opacity;
+ currentBackgroundContent.style.backgroundImage = backgroundImageURL;
+ }
+
+ }
+
+ // Don't transition between identical backgrounds. This
+ // prevents unwanted flicker.
+ var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
+ var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
+ if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
+ dom.background.classList.add( 'no-transition' );
+ }
+
+ previousBackground = currentBackground;
+
+ }
+
+ // If there's a background brightness flag for this slide,
+ // bubble it to the .reveal container
+ if( currentSlide ) {
+ [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
+ if( currentSlide.classList.contains( classToBubble ) ) {
+ dom.wrapper.classList.add( classToBubble );
+ }
+ else {
+ dom.wrapper.classList.remove( classToBubble );
+ }
+ } );
+ }
+
+ // Allow the first background to apply without transition
+ setTimeout( function() {
+ dom.background.classList.remove( 'no-transition' );
+ }, 1 );
+
+ }
+
+ /**
+ * Updates the position of the parallax background based
+ * on the current slide index.
+ */
+ function updateParallax() {
+
+ if( config.parallaxBackgroundImage ) {
+
+ var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
+ verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
+
+ var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
+ backgroundWidth, backgroundHeight;
+
+ if( backgroundSize.length === 1 ) {
+ backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
+ }
+ else {
+ backgroundWidth = parseInt( backgroundSize[0], 10 );
+ backgroundHeight = parseInt( backgroundSize[1], 10 );
+ }
+
+ var slideWidth = dom.background.offsetWidth,
+ horizontalSlideCount = horizontalSlides.length,
+ horizontalOffsetMultiplier,
+ horizontalOffset;
+
+ if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
+ horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
+ }
+ else {
+ horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
+ }
+
+ horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
+
+ var slideHeight = dom.background.offsetHeight,
+ verticalSlideCount = verticalSlides.length,
+ verticalOffsetMultiplier,
+ verticalOffset;
+
+ if( typeof config.parallaxBackgroundVertical === 'number' ) {
+ verticalOffsetMultiplier = config.parallaxBackgroundVertical;
+ }
+ else {
+ verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
+ }
+
+ verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
+
+ dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
+
+ }
+
+ }
+
+ /**
+ * Should the given element be preloaded?
+ * Decides based on local element attributes and global config.
+ *
+ * @param {HTMLElement} element
+ */
+ function shouldPreload( element ) {
+
+ // Prefer an explicit global preload setting
+ var preload = config.preloadIframes;
+
+ // If no global setting is available, fall back on the element's
+ // own preload setting
+ if( typeof preload !== 'boolean' ) {
+ preload = element.hasAttribute( 'data-preload' );
+ }
+
+ return preload;
+ }
+
+ /**
+ * Called when the given slide is within the configured view
+ * distance. Shows the slide element and loads any content
+ * that is set to load lazily (data-src).
+ *
+ * @param {HTMLElement} slide Slide to show
+ */
+ function loadSlide( slide, options ) {
+
+ options = options || {};
+
+ // Show the slide element
+ slide.style.display = config.display;
+
+ // Media elements with data-src attributes
+ toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
+ if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
+ element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+ element.setAttribute( 'data-lazy-loaded', '' );
+ element.removeAttribute( 'data-src' );
+ }
+ } );
+
+ // Media elements with