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