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share/revealjs/js/controllers/slidenumber.js  view on Meta::CPAN

/**
 * Handles the display of reveal.js' optional slide number.
 */
export default class SlideNumber {

	constructor( Reveal ) {

		this.Reveal = Reveal;

	}

	render() {

		this.element = document.createElement( 'div' );
		this.element.className = 'slide-number';
		this.Reveal.getRevealElement().appendChild( this.element );

	}

	/**
	 * Called when the reveal.js config is updated.
	 */
	configure( config, oldConfig ) {

		let slideNumberDisplay = 'none';
		if( config.slideNumber && !this.Reveal.isPrintingPDF() ) {
			if( config.showSlideNumber === 'all' ) {
				slideNumberDisplay = 'block';
			}
			else if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {
				slideNumberDisplay = 'block';
			}
		}

		this.element.style.display = slideNumberDisplay;

	}

	/**
	 * Updates the slide number to match the current slide.
	 */
	update() {

		// Update slide number if enabled
		if( this.Reveal.getConfig().slideNumber && this.element ) {
			this.element.innerHTML = this.getSlideNumber();
		}

	}

	/**
	 * Returns the HTML string corresponding to the current slide
	 * number, including formatting.
	 */
	getSlideNumber( slide = this.Reveal.getCurrentSlide() ) {

		let config = this.Reveal.getConfig();
		let value;
		let format = 'h.v';

		if ( typeof config.slideNumber === 'function' ) {
			value = config.slideNumber( slide );
		} else {
			// Check if a custom number format is available
			if( typeof config.slideNumber === 'string' ) {
				format = config.slideNumber;
			}

			// If there are ONLY vertical slides in this deck, always use
			// a flattened slide number
			if( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {
				format = 'c';
			}

			// Offset the current slide number by 1 to make it 1-indexed
			let horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;

			value = [];
			switch( format ) {
				case 'c':
					value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );