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Batch print DOM updates

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This commit is contained in:
Jeroen Hermans 2020-11-15 22:08:13 +01:00
parent 49f78535d1
commit 33c4c1c5d2
1 changed files with 13 additions and 6 deletions
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17
js/controllers/print.js
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@ -55,6 +55,9 @@ export default class Print {
slideScrollHeights.push( slide.scrollHeight );
});
const pages = [];
const pageContainer = slides[0].parentNode;
// Slide and slide background layout
slides.forEach( function( slide, index ) {
@ -79,9 +82,10 @@ export default class Print {
// 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';
slide.parentNode.insertBefore( page, slide );
page.appendChild( slide );
// Position the slide inside of the page
@ -109,7 +113,7 @@ export default class Print {
notesElement.innerHTML = notes;
if( notesLayout === 'separate-page' ) {
page.parentNode.insertBefore( notesElement, page.nextSibling );
pages.push( notesElement );
}
else {
notesElement.style.left = notesSpacing + 'px';
@ -141,7 +145,6 @@ export default class Print {
const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
let previousFragmentStep;
let previousPage;
fragmentGroups.forEach( function( fragments ) {
@ -159,10 +162,9 @@ export default class Print {
// Create a separate page for the current fragment state
let clonedPage = page.cloneNode( true );
page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
pages.push( clonedPage );
previousFragmentStep = fragments;
previousPage = clonedPage;
}, this );
@ -185,6 +187,11 @@ export default class Print {
}, this );
await new Promise(requestAnimationFrame);
pages.forEach( function( page ) {
pageContainer.appendChild( page );
})
// Notify subscribers that the PDF layout is good to go
this.Reveal.dispatchEvent({ type: 'pdf-ready' });