| Christophe Dervieux | e1893ae | 2021-10-07 17:09:02 +0200 | [diff] [blame^] | 1 | /** |
| 2 | * Handles the showing and |
| 3 | */ |
| 4 | export default class Notes { |
| 5 | |
| 6 | constructor( Reveal ) { |
| 7 | |
| 8 | this.Reveal = Reveal; |
| 9 | |
| 10 | } |
| 11 | |
| 12 | render() { |
| 13 | |
| 14 | this.element = document.createElement( 'div' ); |
| 15 | this.element.className = 'speaker-notes'; |
| 16 | this.element.setAttribute( 'data-prevent-swipe', '' ); |
| 17 | this.element.setAttribute( 'tabindex', '0' ); |
| 18 | this.Reveal.getRevealElement().appendChild( this.element ); |
| 19 | |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Called when the reveal.js config is updated. |
| 24 | */ |
| 25 | configure( config, oldConfig ) { |
| 26 | |
| 27 | if( config.showNotes ) { |
| 28 | this.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' ); |
| 29 | } |
| 30 | |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * Pick up notes from the current slide and display them |
| 35 | * to the viewer. |
| 36 | * |
| 37 | * @see {@link config.showNotes} |
| 38 | */ |
| 39 | update() { |
| 40 | |
| 41 | if( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) { |
| 42 | |
| 43 | this.element.innerHTML = this.getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>'; |
| 44 | |
| 45 | } |
| 46 | |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Updates the visibility of the speaker notes sidebar that |
| 51 | * is used to share annotated slides. The notes sidebar is |
| 52 | * only visible if showNotes is true and there are notes on |
| 53 | * one or more slides in the deck. |
| 54 | */ |
| 55 | updateVisibility() { |
| 56 | |
| 57 | if( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) { |
| 58 | this.Reveal.getRevealElement().classList.add( 'show-notes' ); |
| 59 | } |
| 60 | else { |
| 61 | this.Reveal.getRevealElement().classList.remove( 'show-notes' ); |
| 62 | } |
| 63 | |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Checks if there are speaker notes for ANY slide in the |
| 68 | * presentation. |
| 69 | */ |
| 70 | hasNotes() { |
| 71 | |
| 72 | return this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0; |
| 73 | |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Checks if this presentation is running inside of the |
| 78 | * speaker notes window. |
| 79 | * |
| 80 | * @return {boolean} |
| 81 | */ |
| 82 | isSpeakerNotesWindow() { |
| 83 | |
| 84 | return !!window.location.search.match( /receiver/gi ); |
| 85 | |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Retrieves the speaker notes from a slide. Notes can be |
| 90 | * defined in two ways: |
| 91 | * 1. As a data-notes attribute on the slide <section> |
| 92 | * 2. As an <aside class="notes"> inside of the slide |
| 93 | * |
| 94 | * @param {HTMLElement} [slide=currentSlide] |
| 95 | * @return {(string|null)} |
| 96 | */ |
| 97 | getSlideNotes( slide = this.Reveal.getCurrentSlide() ) { |
| 98 | |
| 99 | // Notes can be specified via the data-notes attribute... |
| 100 | if( slide.hasAttribute( 'data-notes' ) ) { |
| 101 | return slide.getAttribute( 'data-notes' ); |
| 102 | } |
| 103 | |
| 104 | // ... or using an <aside class="notes"> element |
| 105 | let notesElement = slide.querySelector( 'aside.notes' ); |
| 106 | if( notesElement ) { |
| 107 | return notesElement.innerHTML; |
| 108 | } |
| 109 | |
| 110 | return null; |
| 111 | |
| 112 | } |
| 113 | |
| 114 | } |