170 lines
3.2 KiB
JavaScript
170 lines
3.2 KiB
JavaScript
/**
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* Makes it possible to jump to a slide by entering its
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* slide number or id.
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*/
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export default class JumpToSlide {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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this.onInput = this.onInput.bind( this );
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this.onBlur = this.onBlur.bind( this );
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this.onKeyDown = this.onKeyDown.bind( this );
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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 = 'jump-to-slide';
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this.jumpInput = document.createElement( 'input' );
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this.jumpInput.type = 'text';
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this.jumpInput.className = 'jump-to-slide-input';
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this.jumpInput.placeholder = 'Jump to slide';
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this.jumpInput.addEventListener( 'input', this.onInput );
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this.jumpInput.addEventListener( 'keydown', this.onKeyDown );
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this.jumpInput.addEventListener( 'blur', this.onBlur );
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this.element.appendChild( this.jumpInput );
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}
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show() {
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this.indicesOnShow = this.Reveal.getIndices();
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this.Reveal.getRevealElement().appendChild( this.element );
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this.jumpInput.focus();
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}
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hide() {
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if( this.isVisible() ) {
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this.element.remove();
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this.jumpInput.value = '';
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clearTimeout( this.jumpTimeout );
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delete this.jumpTimeout;
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}
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}
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isVisible() {
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return !!this.element.parentNode;
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}
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/**
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* Parses the current input and jumps to the given slide.
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*/
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jump() {
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clearTimeout( this.jumpTimeout );
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delete this.jumpTimeout;
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const query = this.jumpInput.value.trim( '' );
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let indices = this.Reveal.location.getIndicesFromHash( query, { oneBasedIndex: true } );
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// If no valid index was found and the input query is a
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// string, fall back on a simple search
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if( !indices && /\S+/i.test( query ) && query.length > 1 ) {
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indices = this.search( query );
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}
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if( indices && query !== '' ) {
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this.Reveal.slide( indices.h, indices.v, indices.f );
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return true;
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}
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else {
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this.Reveal.slide( this.indicesOnShow.h, this.indicesOnShow.v, this.indicesOnShow.f );
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return false;
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}
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}
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jumpAfter( delay ) {
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clearTimeout( this.jumpTimeout );
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this.jumpTimeout = setTimeout( () => this.jump(), delay );
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}
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/**
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* A lofi search that looks for the given query in all
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* of our slides and returns the first match.
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*/
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search( query ) {
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const regex = new RegExp( '\\b' + query.trim() + '\\b', 'i' );
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const slide = this.Reveal.getSlides().find( ( slide ) => {
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return regex.test( slide.innerText );
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} );
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if( slide ) {
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return this.Reveal.getIndices( slide );
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}
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else {
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return null;
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}
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}
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/**
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* Reverts back to the slide we were on when jump to slide was
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* invoked.
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*/
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cancel() {
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this.Reveal.slide( this.indicesOnShow.h, this.indicesOnShow.v, this.indicesOnShow.f );
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this.hide();
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}
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confirm() {
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this.jump();
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this.hide();
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}
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destroy() {
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this.jumpInput.removeEventListener( 'input', this.onInput );
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this.jumpInput.removeEventListener( 'keydown', this.onKeyDown );
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this.jumpInput.removeEventListener( 'blur', this.onBlur );
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this.element.remove();
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}
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onKeyDown( event ) {
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if( event.keyCode === 13 ) {
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this.confirm();
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}
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else if( event.keyCode === 27 ) {
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this.cancel();
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event.stopImmediatePropagation();
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}
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}
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onInput( event ) {
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this.jumpAfter( 200 );
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}
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onBlur() {
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setTimeout( () => this.hide(), 1 );
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}
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} |