Prevent layout thrashing by scroll height
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@ -16,7 +16,7 @@ export default class Print {
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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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setupPDF() {
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async setupPDF() {
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let config = this.Reveal.getConfig();
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@ -48,6 +48,13 @@ export default class Print {
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// Compute slide numbers now, before we start duplicating slides
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let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
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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 = []
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slides.forEach( function( slide ) {
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slideScrollHeights.push( slide.scrollHeight );
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});
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// Slide and slide background layout
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slides.forEach( function( slide, index ) {
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@ -58,7 +65,7 @@ export default class Print {
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let left = ( pageWidth - slideWidth ) / 2,
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top = ( pageHeight - slideHeight ) / 2;
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let contentHeight = slide.scrollHeight;
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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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