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refactor fragment pdf exporting to support multiple fragments with same index #1955

This commit is contained in:
Hakim El Hattab 2018-06-12 20:44:49 +02:00
parent 3680f1ad10
commit 078a7520cd
1 changed files with 33 additions and 19 deletions
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52
js/reveal.js
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@ -794,31 +794,43 @@
// Copy page and show fragments one after another
if( config.pdfSeparateFragments ) {
var numberOfFragments = toArray( page.querySelectorAll( '.fragment' ) ).length;
// 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.
var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
for( var currentFragment = 0; currentFragment < numberOfFragments; currentFragment++ ) {
var previousFragmentStep;
var previousPage;
var clonedPage = page.cloneNode( true );
page.parentNode.insertBefore( clonedPage, page.nextSibling );
fragmentGroups.forEach( function( fragments ) {
toArray( sortFragments( clonedPage.querySelectorAll( '.fragment' ) ) ).forEach( function( fragment, fragmentIndex ) {
if( fragmentIndex < currentFragment ) {
fragment.classList.add( 'visible' );
// Remove 'current-fragment' from the previous group
if( previousFragmentStep ) {
previousFragmentStep.forEach( function( fragment ) {
fragment.classList.remove( 'current-fragment' );
}
else if( fragmentIndex === currentFragment ) {
fragment.classList.add( 'visible', 'current-fragment' );
}
else {
fragment.classList.remove( 'visible', 'current-fragment' );
}
} );
}
// Show the fragments for the current index
fragments.forEach( function( fragment ) {
fragment.classList.add( 'visible', 'current-fragment' );
} );
page = clonedPage;
// Create a separate page for the current fragment state
var clonedPage = page.cloneNode( true );
page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
}
previousFragmentStep = fragments;
previousPage = clonedPage;
} );
// 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
@ -4223,9 +4235,11 @@
* the fragment within the fragments list.
*
* @param {object[]|*} fragments
* @param {boolean} grouped If true the returned array will contain
* nested arrays for all fragments with the same index
* @return {object[]} sorted Sorted array of fragments
*/
function sortFragments( fragments ) {
function sortFragments( fragments, grouped ) {
fragments = toArray( fragments );
@ -4268,7 +4282,7 @@
index ++;
} );
return sorted;
return grouped === true ? ordered : sorted;
}