/**
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* Handles the showing of speaker notes
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*/
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export default class Notes {
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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 = 'speaker-notes';
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this.element.setAttribute( 'data-prevent-swipe', '' );
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this.element.setAttribute( 'tabindex', '0' );
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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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if( config.showNotes ) {
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this.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
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}
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}
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/**
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* Pick up notes from the current slide and display them
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* to the viewer.
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*
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* @see {@link config.showNotes}
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*/
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update() {
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if( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {
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this.element.innerHTML = this.getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
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}
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}
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/**
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* Updates the visibility of the speaker notes sidebar that
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* is used to share annotated slides. The notes sidebar is
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* only visible if showNotes is true and there are notes on
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* one or more slides in the deck.
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*/
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updateVisibility() {
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if( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {
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this.Reveal.getRevealElement().classList.add( 'show-notes' );
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}
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else {
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this.Reveal.getRevealElement().classList.remove( 'show-notes' );
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}
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}
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/**
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* Checks if there are speaker notes for ANY slide in the
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* presentation.
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*/
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hasNotes() {
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return this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;
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}
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/**
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* Checks if this presentation is running inside of the
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* speaker notes window.
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*
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* @return {boolean}
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*/
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isSpeakerNotesWindow() {
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return !!window.location.search.match( /receiver/gi );
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}
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/**
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* Retrieves the speaker notes from a slide. Notes can be
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* defined in two ways:
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* 1. As a data-notes attribute on the slide <section>
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* 2. With <aside class="notes"> elements inside the slide
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*
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* @param {HTMLElement} [slide=currentSlide]
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* @return {(string|null)}
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*/
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getSlideNotes( slide = this.Reveal.getCurrentSlide() ) {
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// Notes can be specified via the data-notes attribute...
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if( slide.hasAttribute( 'data-notes' ) ) {
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return slide.getAttribute( 'data-notes' );
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}
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// ... or using <aside class="notes"> elements
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let notesElements = slide.querySelectorAll( 'aside.notes' );
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if( notesElements ) {
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return Array.from(notesElements).map( notesElement => notesElement.innerHTML ).join( '\n' );
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}
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return null;
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}
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destroy() {
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this.element.remove();
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}
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}
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