Merge branch 'feature/print' into dev
This commit is contained in:
Hakim El Hattab
150
js/reveal.js
150
js/reveal.js
@ -333,6 +333,12 @@ var Reveal = (function(){
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// Update all backgrounds
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updateBackground( true );
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// Special setup and config is required when printing to PDF
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if( isPrintingPDF() ) {
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removeEventListeners();
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setupPDF();
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}
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// Notify listeners that the presentation is ready but use a 1ms
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// timeout to ensure it's not fired synchronously after #initialize()
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setTimeout( function() {
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@ -401,6 +407,74 @@ var Reveal = (function(){
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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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function setupPDF() {
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// The aspect ratio of pages when saving to PDF in Chrome,
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// we need to abide by this ratio when determining the pixel
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// size of our pages
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var pageAspectRatio = 1.295;
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var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
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// Dimensions of the PDF pages
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var pageWidth = Math.round( slideSize.width * ( 1 + config.margin ) ),
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pageHeight = Math.round( pageWidth / pageAspectRatio );
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// Dimensions of slides within the pages
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var slideWidth = slideSize.width,
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slideHeight = slideSize.height;
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document.body.classList.add( '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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// Slide and slide background layout
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toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
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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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var left = ( pageWidth - slideWidth ) / 2,
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top = ( pageHeight - slideHeight ) / 2;
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var contentHeight = getAbsoluteHeight( slide );
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var numberOfPages = Math.ceil( contentHeight / pageHeight );
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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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// 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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// TODO Backgrounds need to be multiplied when the slide
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// stretches over multiple pages
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var background = slide.querySelector( '.slide-background' );
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if( background ) {
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background.style.width = pageWidth + 'px';
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background.style.height = ( pageHeight * numberOfPages ) + 'px';
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background.style.top = -top + 'px';
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background.style.left = -left + 'px';
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}
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}
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} );
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// Show all fragments
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toArray( document.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).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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* Creates an HTML element and returns a reference to it.
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* If the element already exists the existing instance will
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@ -428,9 +502,7 @@ var Reveal = (function(){
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*/
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function createBackgrounds() {
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if( isPrintingPDF() ) {
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document.body.classList.add( 'print-pdf' );
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}
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var printMode = isPrintingPDF();
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// Clear prior backgrounds
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dom.background.innerHTML = '';
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@ -441,7 +513,7 @@ var Reveal = (function(){
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var backgroundStack;
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if( isPrintingPDF() ) {
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if( printMode ) {
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backgroundStack = createBackground( slideh, slideh );
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}
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else {
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@ -451,7 +523,7 @@ var Reveal = (function(){
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// Iterate over all vertical slides
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toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
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if( isPrintingPDF() ) {
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if( printMode ) {
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createBackground( slidev, slidev );
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}
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else {
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@ -887,7 +959,7 @@ var Reveal = (function(){
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if( typeof child.offsetTop === 'number' && child.style ) {
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// Count # of abs children
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if( child.style.position === 'absolute' ) {
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if( window.getComputedStyle( child ).position === 'absolute' ) {
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absoluteChildren += 1;
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}
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@ -1124,37 +1196,18 @@ var Reveal = (function(){
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if( dom.wrapper && !isPrintingPDF() ) {
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// Available space to scale within
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var availableWidth = dom.wrapper.offsetWidth,
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availableHeight = dom.wrapper.offsetHeight;
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var size = getComputedSlideSize();
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// Reduce available space by margin
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availableWidth -= ( availableHeight * config.margin );
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availableHeight -= ( availableHeight * config.margin );
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// Dimensions of the content
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var slideWidth = config.width,
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slideHeight = config.height,
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slidePadding = 20; // TODO Dig this out of DOM
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var slidePadding = 20; // TODO Dig this out of DOM
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// Layout the contents of the slides
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layoutSlideContents( config.width, config.height, slidePadding );
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// Slide width may be a percentage of available width
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if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
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slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
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}
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// Slide height may be a percentage of available height
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if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
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slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
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}
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dom.slides.style.width = slideWidth + 'px';
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dom.slides.style.height = slideHeight + 'px';
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dom.slides.style.width = size.width + 'px';
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dom.slides.style.height = size.height + 'px';
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// Determine scale of content to fit within available space
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scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
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scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
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// Respect max/min scale settings
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scale = Math.max( scale, config.minScale );
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@ -1191,7 +1244,7 @@ var Reveal = (function(){
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slide.style.top = 0;
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}
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else {
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slide.style.top = Math.max( ( ( slideHeight - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
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slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
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}
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}
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else {
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@ -1239,6 +1292,41 @@ var Reveal = (function(){
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}
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/**
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* Calculates the computed pixel size of our slides. These
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* values are based on the width and height configuration
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* options.
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*/
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function getComputedSlideSize( presentationWidth, presentationHeight ) {
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var size = {
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// Slide size
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width: config.width,
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height: config.height,
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// Presentation size
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presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
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presentationHeight: presentationHeight || dom.wrapper.offsetHeight
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};
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// Reduce available space by margin
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size.presentationWidth -= ( size.presentationHeight * config.margin );
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size.presentationHeight -= ( size.presentationHeight * config.margin );
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// Slide width may be a percentage of available width
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if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
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size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
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}
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// Slide height may be a percentage of available height
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if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
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size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
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}
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return size;
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}
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/**
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* Stores the vertical index of a stack so that the same
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* vertical slide can be selected when navigating to and
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