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share/revealjs/js/controllers/controls.js  view on Meta::CPAN

	}

	/**
	 * 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();
		}