move overview to new module
This commit is contained in:
Hakim El Hattab
@ -1,7 +1,9 @@
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import { extend, toArray } from '../utils/util.js'
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/**
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*
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* Handles sorting and navigation of slide fragments.
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* Fragments are elements within a slide that are
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* revealed/animated incrementally.
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*/
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export default class Fragments {
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249
js/controllers/overview.js
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249
js/controllers/overview.js
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@ -0,0 +1,249 @@
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import { SLIDES_SELECTOR } from '../utils/constants.js'
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import { extend, toArray, transformElement } from '../utils/util.js'
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/**
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* Handles all logic related to the overview mode
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* (birds-eye view of all slides).
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*/
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export default class Overview {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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this.active = false;
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this.onSlideClicked = this.onSlideClicked.bind( this );
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}
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/**
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* Displays the overview of slides (quick nav) by scaling
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* down and arranging all slide elements.
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*/
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activate() {
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// Only proceed if enabled in config
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if( this.Reveal.getConfig().overview && !this.isActive() ) {
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this.active = true;
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this.Reveal.getRevealElement().classList.add( 'overview' );
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// Don't auto-slide while in overview mode
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this.Reveal.cancelAutoSlide();
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// Move the backgrounds element into the slide container to
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// that the same scaling is applied
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this.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );
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// Clicking on an overview slide navigates to it
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toArray( this.Reveal.getRevealElement().querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {
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if( !slide.classList.contains( 'stack' ) ) {
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slide.addEventListener( 'click', this.onSlideClicked, true );
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}
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} );
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// Calculate slide sizes
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const margin = 70;
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const slideSize = this.Reveal.getComputedSlideSize();
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this.overviewSlideWidth = slideSize.width + margin;
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this.overviewSlideHeight = slideSize.height + margin;
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// Reverse in RTL mode
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if( this.Reveal.getConfig().rtl ) {
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this.overviewSlideWidth = -this.overviewSlideWidth;
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}
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this.Reveal.updateSlidesVisibility();
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this.layout();
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this.update();
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this.Reveal.layout();
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const indices = this.Reveal.getIndices();
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// Notify observers of the overview showing
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this.Reveal.dispatchEvent( 'overviewshown', {
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'indexh': indices.h,
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'indexv': indices.v,
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'currentSlide': this.Reveal.getCurrentSlide()
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} );
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}
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}
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/**
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* Uses CSS transforms to position all slides in a grid for
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* display inside of the overview mode.
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*/
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layout() {
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// Layout slides
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this.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {
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hslide.setAttribute( 'data-index-h', h );
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transformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
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if( hslide.classList.contains( 'stack' ) ) {
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toArray( hslide.querySelectorAll( 'section' ) ).forEach( ( vslide, v ) => {
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vslide.setAttribute( 'data-index-h', h );
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vslide.setAttribute( 'data-index-v', v );
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transformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
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} );
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}
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} );
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// Layout slide backgrounds
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toArray( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {
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transformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
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toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( ( vbackground, v ) => {
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transformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
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} );
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} );
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}
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/**
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* Moves the overview viewport to the current slides.
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* Called each time the current slide changes.
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*/
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update() {
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const vmin = Math.min( window.innerWidth, window.innerHeight );
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const scale = Math.max( vmin / 5, 150 ) / vmin;
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const indices = this.Reveal.getIndices();
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this.Reveal.transformSlides( {
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overview: [
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'scale('+ scale +')',
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'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',
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'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'
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].join( ' ' )
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} );
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}
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/**
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* Exits the slide overview and enters the currently
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* active slide.
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*/
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deactivate() {
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// Only proceed if enabled in config
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if( this.Reveal.getConfig().overview ) {
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this.active = false;
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this.Reveal.getRevealElement().classList.remove( 'overview' );
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// Temporarily add a class so that transitions can do different things
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// depending on whether they are exiting/entering overview, or just
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// moving from slide to slide
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this.Reveal.getRevealElement().classList.add( 'overview-deactivating' );
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setTimeout( () => {
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this.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );
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}, 1 );
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// Move the background element back out
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this.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );
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// Clean up changes made to slides
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toArray( this.Reveal.getRevealElement().querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {
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transformElement( slide, '' );
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slide.removeEventListener( 'click', this.onSlideClicked, true );
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} );
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// Clean up changes made to backgrounds
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toArray( this.Reveal.getBackgroundsElement().querySelectorAll( '.slide-background' ) ).forEach( background => {
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transformElement( background, '' );
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} );
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this.Reveal.transformSlides( { overview: '' } );
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const indices = this.Reveal.getIndices();
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this.Reveal.slide( indices.h, indices.v );
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this.Reveal.layout();
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this.Reveal.cueAutoSlide();
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// Notify observers of the overview hiding
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this.Reveal.dispatchEvent( 'overviewhidden', {
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'indexh': indices.h,
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'indexv': indices.v,
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'currentSlide': this.Reveal.getCurrentSlide()
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} );
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}
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}
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/**
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* Toggles the slide overview mode on and off.
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*
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* @param {Boolean} [override] Flag which overrides the
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* toggle logic and forcibly sets the desired state. True means
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* overview is open, false means it's closed.
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*/
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toggle( override ) {
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if( typeof override === 'boolean' ) {
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override ? this.activate() : this.deactivate();
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}
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else {
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this.isActive() ? this.deactivate() : this.activate();
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}
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}
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/**
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* Checks if the overview is currently active.
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*
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* @return {Boolean} true if the overview is active,
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* false otherwise
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*/
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isActive() {
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return this.active;
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}
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/**
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* Invoked when a slide is and we're in the overview.
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*
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* @param {object} event
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*/
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onSlideClicked( event ) {
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if( this.isActive() ) {
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event.preventDefault();
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let element = event.target;
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while( element && !element.nodeName.match( /section/gi ) ) {
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element = element.parentNode;
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}
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if( element && !element.classList.contains( 'disabled' ) ) {
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this.deactivate();
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if( element.nodeName.match( /section/gi ) ) {
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let h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
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v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
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this.Reveal.slide( h, v );
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}
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}
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}
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}
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}
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