Update to last reveal.js 4.2.1 (#148)
diff --git a/inst/reveal.js-4.2.1/js/controllers/print.js b/inst/reveal.js-4.2.1/js/controllers/print.js
new file mode 100644
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+++ b/inst/reveal.js-4.2.1/js/controllers/print.js
@@ -0,0 +1,228 @@
+import { SLIDES_SELECTOR } from '../utils/constants.js'
+import { queryAll, createStyleSheet } from '../utils/util.js'
+
+/**
+ * Setups up our presentation for printing/exporting to PDF.
+ */
+export default class Print {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ /**
+ * Configures the presentation for printing to a static
+ * PDF.
+ */
+ async setupPDF() {
+
+ const config = this.Reveal.getConfig();
+ const slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )
+
+ // Compute slide numbers now, before we start duplicating slides
+ const doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+
+ const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+
+ // Dimensions of the PDF pages
+ const pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+ pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
+
+ // Dimensions of slides within the pages
+ const slideWidth = slideSize.width,
+ slideHeight = slideSize.height;
+
+ await new Promise( requestAnimationFrame );
+
+ // Let the browser know what page size we want to print
+ createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
+
+ // Limit the size of certain elements to the dimensions of the slide
+ createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
+
+ document.documentElement.classList.add( 'print-pdf' );
+ document.body.style.width = pageWidth + 'px';
+ document.body.style.height = pageHeight + 'px';
+
+ const viewportElement = document.querySelector( '.reveal-viewport' );
+ let presentationBackground;
+ if( viewportElement ) {
+ const viewportStyles = window.getComputedStyle( viewportElement );
+ if( viewportStyles && viewportStyles.background ) {
+ presentationBackground = viewportStyles.background;
+ }
+ }
+
+ // Make sure stretch elements fit on slide
+ await new Promise( requestAnimationFrame );
+ this.Reveal.layoutSlideContents( slideWidth, slideHeight );
+
+ // Batch scrollHeight access to prevent layout thrashing
+ await new Promise( requestAnimationFrame );
+
+ const slideScrollHeights = slides.map( slide => slide.scrollHeight );
+
+ const pages = [];
+ const pageContainer = slides[0].parentNode;
+
+ // Slide and slide background layout
+ slides.forEach( function( slide, index ) {
+
+ // 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
+ let left = ( pageWidth - slideWidth ) / 2;
+ let top = ( pageHeight - slideHeight ) / 2;
+
+ const contentHeight = slideScrollHeights[ index ];
+ let 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
+ const page = document.createElement( 'div' );
+ pages.push( page );
+
+ page.className = 'pdf-page';
+ page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
+
+ // Copy the presentation-wide background to each individual
+ // page when printing
+ if( presentationBackground ) {
+ page.style.background = presentationBackground;
+ }
+
+ 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';
+
+ // Re-run the slide layout so that r-fit-text is applied based on
+ // the printed slide size
+ this.Reveal.slideContent.layout( slide )
+
+ if( slide.slideBackgroundElement ) {
+ page.insertBefore( slide.slideBackgroundElement, slide );
+ }
+
+ // Inject notes if `showNotes` is enabled
+ if( config.showNotes ) {
+
+ // Are there notes for this slide?
+ const notes = this.Reveal.getSlideNotes( slide );
+ if( notes ) {
+
+ const notesSpacing = 8;
+ const notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+ const 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' ) {
+ pages.push( notesElement );
+ }
+ 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( doingSlideNumbers ) {
+ const slideNumber = index + 1;
+ const numberElement = document.createElement( 'div' );
+ numberElement.classList.add( 'slide-number' );
+ numberElement.classList.add( 'slide-number-pdf' );
+ numberElement.innerHTML = slideNumber;
+ 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.
+ const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
+
+ let previousFragmentStep;
+
+ 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' );
+ }, this );
+
+ // Create a separate page for the current fragment state
+ const clonedPage = page.cloneNode( true );
+ pages.push( clonedPage );
+
+ previousFragmentStep = fragments;
+
+ }, this );
+
+ // 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 {
+ queryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {
+ fragment.classList.add( 'visible' );
+ } );
+ }
+
+ }
+
+ }, this );
+
+ await new Promise( requestAnimationFrame );
+
+ pages.forEach( page => pageContainer.appendChild( page ) );
+
+ // Notify subscribers that the PDF layout is good to go
+ this.Reveal.dispatchEvent({ type: 'pdf-ready' });
+
+ }
+
+ /**
+ * Checks if this instance is being used to print a PDF.
+ */
+ isPrintingPDF() {
+
+ return ( /print-pdf/gi ).test( window.location.search );
+
+ }
+
+}