import { queryAll } from '../utils/util.js' import { isAndroid } from '../utils/device.js' /** * Manages our presentation controls. This includes both * the built-in control arrows as well as event monitoring * of any elements within the presentation with either of the * following helper classes: * - .navigate-up * - .navigate-right * - .navigate-down * - .navigate-left * - .navigate-next * - .navigate-prev */ export default class Controls { constructor( Reveal ) { this.Reveal = Reveal; this.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this ); this.onNavigateRightClicked = this.onNavigateRightClicked.bind( this ); this.onNavigateUpClicked = this.onNavigateUpClicked.bind( this ); this.onNavigateDownClicked = this.onNavigateDownClicked.bind( this ); this.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this ); this.onNavigateNextClicked = this.onNavigateNextClicked.bind( this ); } render() { const rtl = this.Reveal.getConfig().rtl; const revealElement = this.Reveal.getRevealElement(); this.element = document.createElement( 'aside' ); this.element.className = 'controls'; this.element.innerHTML = ` `; this.Reveal.getRevealElement().appendChild( this.element ); // There can be multiple instances of controls throughout the page this.controlsLeft = queryAll( revealElement, '.navigate-left' ); this.controlsRight = queryAll( revealElement, '.navigate-right' ); this.controlsUp = queryAll( revealElement, '.navigate-up' ); this.controlsDown = queryAll( revealElement, '.navigate-down' ); this.controlsPrev = queryAll( revealElement, '.navigate-prev' ); this.controlsNext = queryAll( revealElement, '.navigate-next' ); // The left, right and down arrows in the standard reveal.js controls this.controlsRightArrow = this.element.querySelector( '.navigate-right' ); this.controlsLeftArrow = this.element.querySelector( '.navigate-left' ); this.controlsDownArrow = this.element.querySelector( '.navigate-down' ); } /** * Called when the reveal.js config is updated. */ configure( config, oldConfig ) { this.element.style.display = config.controls ? 'block' : 'none'; this.element.setAttribute( 'data-controls-layout', config.controlsLayout ); this.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows ); } bind() { // Listen to both touch and click events, in case the device // supports both let pointerEvents = [ 'touchstart', 'click' ]; // Only support touch for Android, fixes double navigations in // stock browser if( isAndroid ) { pointerEvents = [ 'touchstart' ]; } pointerEvents.forEach( eventName => { this.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) ); this.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) ); this.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) ); this.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) ); this.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) ); this.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) ); } ); } unbind() { [ 'touchstart', 'click' ].forEach( eventName => { this.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) ); this.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) ); this.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) ); this.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) ); this.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) ); this.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) ); } ); } /** * Updates the state of all control/navigation arrows. */ update() { let routes = this.Reveal.availableRoutes(); // Remove the 'enabled' class from all directions [...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => { node.classList.remove( 'enabled', 'fragmented' ); // Set 'disabled' attribute on all directions node.setAttribute( 'disabled', 'disabled' ); } ); // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons if( routes.left ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Prev/next buttons if( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Highlight fragment directions let currentSlide = this.Reveal.getCurrentSlide(); if( currentSlide ) { let fragmentsRoutes = this.Reveal.fragments.availableRoutes(); // Always apply fragment decorator to prev/next buttons if( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Apply fragment decorators to directional buttons based on // what slide axis they are in if( this.Reveal.isVerticalSlide( currentSlide ) ) { if( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); } else { if( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); } } if( this.Reveal.getConfig().controlsTutorial ) { let indices = this.Reveal.getIndices(); // Highlight control arrows with an animation to ensure // that the viewer knows how to navigate if( !this.Reveal.hasNavigatedVertically() && routes.down ) { this.controlsDownArrow.classList.add( 'highlight' ); } else { this.controlsDownArrow.classList.remove( 'highlight' ); if( this.Reveal.getConfig().rtl ) { if( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) { this.controlsLeftArrow.classList.add( 'highlight' ); } else { this.controlsLeftArrow.classList.remove( 'highlight' ); } } else { if( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) { this.controlsRightArrow.classList.add( 'highlight' ); } else { this.controlsRightArrow.classList.remove( 'highlight' ); } } } } } destroy() { this.unbind(); this.element.remove(); } /** * Event handlers for navigation control buttons. */ onNavigateLeftClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); if( this.Reveal.getConfig().navigationMode === 'linear' ) { this.Reveal.prev(); } else { this.Reveal.left(); } } onNavigateRightClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); if( this.Reveal.getConfig().navigationMode === 'linear' ) { this.Reveal.next(); } else { this.Reveal.right(); } } onNavigateUpClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); this.Reveal.up(); } onNavigateDownClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); this.Reveal.down(); } onNavigatePrevClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); this.Reveal.prev(); } onNavigateNextClicked( event ) { event.preventDefault(); this.Reveal.onUserInput(); this.Reveal.next(); } }