237 lines
7.5 KiB
JavaScript
237 lines
7.5 KiB
JavaScript
import { SLIDES_SELECTOR } from '../utils/constants.js'
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import { queryAll, createStyleSheet } from '../utils/util.js'
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/**
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* Setups up our presentation for printing/exporting to PDF.
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*/
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export default class PrintView {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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}
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/**
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* Configures the presentation for printing to a static
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* PDF.
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*/
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async activate() {
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const config = this.Reveal.getConfig();
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const slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )
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// Compute slide numbers now, before we start duplicating slides
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const injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
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const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
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// Dimensions of the PDF pages
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const pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
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pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
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// Dimensions of slides within the pages
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const slideWidth = slideSize.width,
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slideHeight = slideSize.height;
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await new Promise( requestAnimationFrame );
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// Let the browser know what page size we want to print
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createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
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// Limit the size of certain elements to the dimensions of the slide
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createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
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document.documentElement.classList.add( 'reveal-print', 'print-pdf' );
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document.body.style.width = pageWidth + 'px';
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document.body.style.height = pageHeight + 'px';
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const viewportElement = this.Reveal.getViewportElement();
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let presentationBackground;
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if( viewportElement ) {
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const viewportStyles = window.getComputedStyle( viewportElement );
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if( viewportStyles && viewportStyles.background ) {
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presentationBackground = viewportStyles.background;
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}
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}
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// Make sure stretch elements fit on slide
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await new Promise( requestAnimationFrame );
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this.Reveal.layoutSlideContents( slideWidth, slideHeight );
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// Batch scrollHeight access to prevent layout thrashing
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await new Promise( requestAnimationFrame );
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const slideScrollHeights = slides.map( slide => slide.scrollHeight );
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const pages = [];
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const pageContainer = slides[0].parentNode;
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let slideNumber = 1;
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// Slide and slide background layout
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slides.forEach( function( slide, index ) {
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// Vertical stacks are not centred since their section
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// children will be
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if( slide.classList.contains( 'stack' ) === false ) {
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// Center the slide inside of the page, giving the slide some margin
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let left = ( pageWidth - slideWidth ) / 2;
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let top = ( pageHeight - slideHeight ) / 2;
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const contentHeight = slideScrollHeights[ index ];
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let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
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// Adhere to configured pages per slide limit
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numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
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// Center slides vertically
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if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
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top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
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}
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// Wrap the slide in a page element and hide its overflow
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// so that no page ever flows onto another
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const page = document.createElement( 'div' );
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pages.push( page );
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page.className = 'pdf-page';
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page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
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// Copy the presentation-wide background to each individual
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// page when printing
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if( presentationBackground ) {
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page.style.background = presentationBackground;
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}
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page.appendChild( slide );
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// Position the slide inside of the page
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slide.style.left = left + 'px';
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slide.style.top = top + 'px';
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slide.style.width = slideWidth + 'px';
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this.Reveal.slideContent.layout( slide );
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if( slide.slideBackgroundElement ) {
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page.insertBefore( slide.slideBackgroundElement, slide );
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}
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// Inject notes if `showNotes` is enabled
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if( config.showNotes ) {
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// Are there notes for this slide?
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const notes = this.Reveal.getSlideNotes( slide );
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if( notes ) {
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const notesSpacing = 8;
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const notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
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const notesElement = document.createElement( 'div' );
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notesElement.classList.add( 'speaker-notes' );
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notesElement.classList.add( 'speaker-notes-pdf' );
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notesElement.setAttribute( 'data-layout', notesLayout );
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notesElement.innerHTML = notes;
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if( notesLayout === 'separate-page' ) {
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pages.push( notesElement );
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}
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else {
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notesElement.style.left = notesSpacing + 'px';
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notesElement.style.bottom = notesSpacing + 'px';
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notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
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page.appendChild( notesElement );
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}
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}
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}
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// Inject page numbers if `slideNumbers` are enabled
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if( injectPageNumbers ) {
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const numberElement = document.createElement( 'div' );
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numberElement.classList.add( 'slide-number' );
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numberElement.classList.add( 'slide-number-pdf' );
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numberElement.innerHTML = slideNumber++;
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page.appendChild( numberElement );
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}
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// Copy page and show fragments one after another
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if( config.pdfSeparateFragments ) {
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// Each fragment 'group' is an array containing one or more
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// fragments. Multiple fragments that appear at the same time
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// are part of the same group.
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const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
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let previousFragmentStep;
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fragmentGroups.forEach( function( fragments, index ) {
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// Remove 'current-fragment' from the previous group
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if( previousFragmentStep ) {
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previousFragmentStep.forEach( function( fragment ) {
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fragment.classList.remove( 'current-fragment' );
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} );
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}
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// Show the fragments for the current index
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fragments.forEach( function( fragment ) {
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fragment.classList.add( 'visible', 'current-fragment' );
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}, this );
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// Create a separate page for the current fragment state
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const clonedPage = page.cloneNode( true );
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// Inject unique page numbers for fragments
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if( injectPageNumbers ) {
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const numberElement = clonedPage.querySelector( '.slide-number-pdf' );
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const fragmentNumber = index + 1;
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numberElement.innerHTML += '.' + fragmentNumber;
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}
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pages.push( clonedPage );
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previousFragmentStep = fragments;
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}, this );
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// Reset the first/original page so that all fragments are hidden
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fragmentGroups.forEach( function( fragments ) {
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fragments.forEach( function( fragment ) {
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fragment.classList.remove( 'visible', 'current-fragment' );
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} );
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} );
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}
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// Show all fragments
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else {
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queryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {
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fragment.classList.add( 'visible' );
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} );
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}
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}
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}, this );
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await new Promise( requestAnimationFrame );
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pages.forEach( page => pageContainer.appendChild( page ) );
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// Re-run JS-based content layout after the slide is added to page DOM
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this.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );
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// Notify subscribers that the PDF layout is good to go
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this.Reveal.dispatchEvent({ type: 'pdf-ready' });
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}
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/**
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* Checks if the print mode is/should be activated.
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*/
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isActive() {
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return this.Reveal.getConfig().view === 'print';
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}
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} |