132 lines
3.3 KiB
JavaScript
132 lines
3.3 KiB
JavaScript
/**
|
|
* 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.isPrintView() ) {
|
|
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 );
|
|
break;
|
|
case 'c/t':
|
|
value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );
|
|
break;
|
|
default:
|
|
let indices = this.Reveal.getIndices( slide );
|
|
value.push( indices.h + horizontalOffset );
|
|
let sep = format === 'h/v' ? '/' : '.';
|
|
if( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
|
|
}
|
|
}
|
|
|
|
let url = '#' + this.Reveal.location.getHash( slide );
|
|
return this.formatNumber( value[0], value[1], value[2], url );
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies HTML formatting to a slide number before it's
|
|
* written to the DOM.
|
|
*
|
|
* @param {number} a Current slide
|
|
* @param {string} delimiter Character to separate slide numbers
|
|
* @param {(number|*)} b Total slides
|
|
* @param {HTMLElement} [url='#'+locationHash()] The url to link to
|
|
* @return {string} HTML string fragment
|
|
*/
|
|
formatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {
|
|
|
|
if( typeof b === 'number' && !isNaN( b ) ) {
|
|
return `<a href="${url}">
|
|
<span class="slide-number-a">${a}</span>
|
|
<span class="slide-number-delimiter">${delimiter}</span>
|
|
<span class="slide-number-b">${b}</span>
|
|
</a>`;
|
|
}
|
|
else {
|
|
return `<a href="${url}">
|
|
<span class="slide-number-a">${a}</span>
|
|
</a>`;
|
|
}
|
|
|
|
}
|
|
|
|
destroy() {
|
|
|
|
this.element.remove();
|
|
|
|
}
|
|
|
|
} |