334 lines
8.2 KiB
JavaScript
334 lines
8.2 KiB
JavaScript
import { extend, toArray } from '../utils/util.js'
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/**
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* Handles sorting and navigation of slide fragments.
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* Fragments are elements within a slide that are
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* revealed/animated incrementally.
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*/
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export default class Fragments {
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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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* Shows all fragments in the presentation. Used when
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* fragments are disabled presentation-wide.
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*/
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showAll() {
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toArray( this.Reveal.getSlidesElement().querySelectorAll( '.fragment' ) ).forEach( element => {
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element.classList.add( 'visible' );
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element.classList.remove( 'current-fragment' );
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} );
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}
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/**
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* Returns an object describing the available fragment
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* directions.
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*
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* @return {{prev: boolean, next: boolean}}
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*/
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availableRoutes() {
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let currentSlide = this.Reveal.getCurrentSlide();
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if( currentSlide && this.Reveal.getConfig().fragments ) {
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let fragments = currentSlide.querySelectorAll( '.fragment' );
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let hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
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return {
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prev: fragments.length - hiddenFragments.length > 0,
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next: !!hiddenFragments.length
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};
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}
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else {
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return { prev: false, next: false };
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}
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}
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/**
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* Return a sorted fragments list, ordered by an increasing
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* "data-fragment-index" attribute.
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*
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* Fragments will be revealed in the order that they are returned by
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* this function, so you can use the index attributes to control the
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* order of fragment appearance.
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*
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* To maintain a sensible default fragment order, fragments are presumed
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* to be passed in document order. This function adds a "fragment-index"
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* attribute to each node if such an attribute is not already present,
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* and sets that attribute to an integer value which is the position of
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* the fragment within the fragments list.
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*
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* @param {object[]|*} fragments
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* @param {boolean} grouped If true the returned array will contain
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* nested arrays for all fragments with the same index
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* @return {object[]} sorted Sorted array of fragments
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*/
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sort( fragments, grouped = false ) {
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fragments = toArray( fragments );
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let ordered = [],
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unordered = [],
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sorted = [];
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// Group ordered and unordered elements
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fragments.forEach( fragment => {
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if( fragment.hasAttribute( 'data-fragment-index' ) ) {
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let index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
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if( !ordered[index] ) {
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ordered[index] = [];
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}
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ordered[index].push( fragment );
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}
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else {
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unordered.push( [ fragment ] );
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}
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} );
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// Append fragments without explicit indices in their
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// DOM order
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ordered = ordered.concat( unordered );
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// Manually count the index up per group to ensure there
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// are no gaps
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let index = 0;
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// Push all fragments in their sorted order to an array,
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// this flattens the groups
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ordered.forEach( group => {
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group.forEach( fragment => {
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sorted.push( fragment );
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fragment.setAttribute( 'data-fragment-index', index );
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} );
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index ++;
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} );
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return grouped === true ? ordered : sorted;
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}
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/**
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* Sorts and formats all of fragments in the
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* presentation.
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*/
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sortAll() {
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this.Reveal.getHorizontalSlides().forEach( horizontalSlide => {
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let verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
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verticalSlides.forEach( ( verticalSlide, y ) => {
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this.sort( verticalSlide.querySelectorAll( '.fragment' ) );
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}, this );
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if( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );
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} );
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}
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/**
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* Refreshes the fragments on the current slide so that they
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* have the appropriate classes (.visible + .current-fragment).
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*
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* @param {number} [index] The index of the current fragment
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* @param {array} [fragments] Array containing all fragments
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* in the current slide
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*
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* @return {{shown: array, hidden: array}}
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*/
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update( index, fragments ) {
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let changedFragments = {
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shown: [],
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hidden: []
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};
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let currentSlide = this.Reveal.getCurrentSlide();
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if( currentSlide && this.Reveal.getConfig().fragments ) {
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fragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );
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if( fragments.length ) {
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let maxIndex = 0;
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if( typeof index !== 'number' ) {
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let currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
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if( currentFragment ) {
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index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
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}
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}
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toArray( fragments ).forEach( ( el, i ) => {
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if( el.hasAttribute( 'data-fragment-index' ) ) {
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i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
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}
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maxIndex = Math.max( maxIndex, i );
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// Visible fragments
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if( i <= index ) {
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let wasVisible = el.classList.contains( 'visible' )
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el.classList.add( 'visible' );
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el.classList.remove( 'current-fragment' );
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// Announce the fragments one by one to the Screen Reader
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this.Reveal.announceStatus( this.Reveal.getStatusText( el ) );
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if( i === index ) {
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el.classList.add( 'current-fragment' );
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this.Reveal.slideContent.startEmbeddedContent( el );
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}
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if( !wasVisible ) {
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changedFragments.shown.push( el )
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this.Reveal.dispatchEvent({
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target: el,
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type: 'visible',
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bubbles: false
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});
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}
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}
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// Hidden fragments
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else {
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let wasVisible = el.classList.contains( 'visible' )
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el.classList.remove( 'visible' );
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el.classList.remove( 'current-fragment' );
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if( wasVisible ) {
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changedFragments.hidden.push( el );
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this.Reveal.dispatchEvent({
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target: el,
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type: 'hidden',
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bubbles: false
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});
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}
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}
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} );
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// Write the current fragment index to the slide <section>.
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// This can be used by end users to apply styles based on
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// the current fragment index.
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index = typeof index === 'number' ? index : -1;
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index = Math.max( Math.min( index, maxIndex ), -1 );
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currentSlide.setAttribute( 'data-fragment', index );
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}
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}
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return changedFragments;
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}
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/**
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* Navigate to the specified slide fragment.
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*
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* @param {?number} index The index of the fragment that
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* should be shown, -1 means all are invisible
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* @param {number} offset Integer offset to apply to the
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* fragment index
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*
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* @return {boolean} true if a change was made in any
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* fragments visibility as part of this call
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*/
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goto( index, offset = 0 ) {
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let currentSlide = this.Reveal.getCurrentSlide();
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if( currentSlide && this.Reveal.getConfig().fragments ) {
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let fragments = this.sort( currentSlide.querySelectorAll( '.fragment' ) );
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if( fragments.length ) {
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// If no index is specified, find the current
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if( typeof index !== 'number' ) {
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let lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
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if( lastVisibleFragment ) {
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index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
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}
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else {
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index = -1;
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}
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}
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// Apply the offset if there is one
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index += offset;
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let changedFragments = this.update( index, fragments );
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if( changedFragments.hidden.length ) {
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this.Reveal.dispatchEvent({
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type: 'fragmenthidden',
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data: {
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fragment: changedFragments.hidden[0],
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fragments: changedFragments.hidden
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}
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});
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}
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if( changedFragments.shown.length ) {
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this.Reveal.dispatchEvent({
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type: 'fragmentshown',
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data: {
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fragment: changedFragments.shown[0],
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fragments: changedFragments.shown
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}
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});
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}
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this.Reveal.updateControls();
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this.Reveal.updateProgress();
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if( this.Reveal.getConfig().fragmentInURL ) {
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this.Reveal.location.writeURL();
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}
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return !!( changedFragments.shown.length || changedFragments.hidden.length );
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}
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}
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return false;
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}
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/**
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* Navigate to the next slide fragment.
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*
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* @return {boolean} true if there was a next fragment,
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* false otherwise
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*/
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next() {
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return this.goto( null, 1 );
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}
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/**
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* Navigate to the previous slide fragment.
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*
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* @return {boolean} true if there was a previous fragment,
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* false otherwise
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*/
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prev() {
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return this.goto( null, -1 );
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}
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} |