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why-cant-we-deploy-today/js/controllers/jumptoslide.js

170 lines
3.2 KiB
JavaScript

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