126 lines
3.2 KiB
JavaScript
126 lines
3.2 KiB
JavaScript
/**
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* Handles the display of reveal.js' optional slide number.
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*/
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export default class SlideNumber {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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}
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render() {
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this.element = document.createElement( 'div' );
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this.element.className = 'slide-number';
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this.Reveal.getRevealElement().appendChild( this.element );
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}
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/**
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* Called when the reveal.js config is updated.
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*/
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configure( config, oldConfig ) {
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let slideNumberDisplay = 'none';
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if( config.slideNumber && !this.Reveal.isPrintingPDF() ) {
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if( config.showSlideNumber === 'all' ) {
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slideNumberDisplay = 'block';
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}
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else if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {
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slideNumberDisplay = 'block';
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}
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}
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this.element.style.display = slideNumberDisplay;
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}
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/**
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* Updates the slide number to match the current slide.
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*/
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update() {
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// Update slide number if enabled
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if( this.Reveal.getConfig().slideNumber && this.element ) {
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this.element.innerHTML = this.getSlideNumber();
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}
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}
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/**
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* Returns the HTML string corresponding to the current slide
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* number, including formatting.
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*/
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getSlideNumber( slide = this.Reveal.getCurrentSlide() ) {
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let config = this.Reveal.getConfig();
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let value;
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let format = 'h.v';
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if ( typeof config.slideNumber === 'function' ) {
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value = config.slideNumber( slide );
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} else {
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// Check if a custom number format is available
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if( typeof config.slideNumber === 'string' ) {
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format = config.slideNumber;
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}
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// If there are ONLY vertical slides in this deck, always use
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// a flattened slide number
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if( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {
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format = 'c';
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}
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// Offset the current slide number by 1 to make it 1-indexed
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let horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;
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value = [];
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switch( format ) {
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case 'c':
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value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );
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break;
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case 'c/t':
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value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );
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break;
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default:
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let indices = this.Reveal.getIndices( slide );
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value.push( indices.h + horizontalOffset );
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let sep = format === 'h/v' ? '/' : '.';
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if( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
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}
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}
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let url = '#' + this.Reveal.location.getHash( slide );
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return this.formatNumber( value[0], value[1], value[2], url );
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}
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/**
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* Applies HTML formatting to a slide number before it's
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* written to the DOM.
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*
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* @param {number} a Current slide
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* @param {string} delimiter Character to separate slide numbers
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* @param {(number|*)} b Total slides
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* @param {HTMLElement} [url='#'+locationHash()] The url to link to
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* @return {string} HTML string fragment
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*/
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formatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {
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if( typeof b === 'number' && !isNaN( b ) ) {
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return `<a href="${url}">
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<span class="slide-number-a">${a}</span>
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<span class="slide-number-delimiter">${delimiter}</span>
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<span class="slide-number-b">${b}</span>
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</a>`;
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}
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else {
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return `<a href="${url}">
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<span class="slide-number-a">${a}</span>
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</a>`;
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}
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}
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} |