auto-animate applies styles via stylesheet to avoid changing the slide dom
Hakim El Hattab
parent
b6b94739e2
commit
4802a2b7f4
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@ -990,17 +990,6 @@ $controlsArrowAngleActive: 36deg;
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}
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/*********************************************
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* AUTO ANIMATE
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*********************************************/
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.reveal section[data-auto-animate] .auto-animate-target {
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transition-property: all;
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transform-origin: top left;
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}
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/*********************************************
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* PAUSED MODE
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*********************************************/
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238
js/reveal.js
238
js/reveal.js
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@ -190,6 +190,11 @@
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// Can be used to globally disable auto-animation
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autoAnimate: true,
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// Optionally provide a custom element matcher function,
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// the function needs to return an array where each value is
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// an array of animation pairs [fromElement, toElement]
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autoAnimateMatcher: null,
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// Default settings for or auto-animate transitions, can be
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// overridden per-slide via data arguments
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autoAnimateEasing: 'ease',
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@ -197,16 +202,19 @@
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// CSS styles that auto-animations will animate between
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autoAnimateStyles: [
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'opacity',
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'color',
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'backgroundColor',
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'font-size',
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'line-height',
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'letter-spacing',
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'border-top-left-radius',
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'border-top-right-radius',
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'border-bottom-left-radius',
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'border-bottom-right-radius'
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{ property: 'opacity' },
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{ property: 'color' },
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{ property: 'backgroundColor' },
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{ property: 'padding', defaultValue: 'computed' },
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{ property: 'font-size', defaultValue: 'computed' },
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{ property: 'line-height', defaultValue: 'computed' },
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{ property: 'letter-spacing', defaultValue: 'computed' },
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{ property: 'border-width', defaultValue: 'computed' },
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{ property: 'border-color' },
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{ property: 'border-top-left-radius' },
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{ property: 'border-top-right-radius' },
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{ property: 'border-bottom-left-radius' },
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{ property: 'border-bottom-right-radius' }
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],
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// Controls automatic progression to the next slide
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@ -383,9 +391,8 @@
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// Flags if the interaction event listeners are bound
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eventsAreBound = false,
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// A list of all elements that we have animated through
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// auto-animations
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autoAnimatedRollbacks = [],
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// <style> element used to apply auto-animations
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autoAnimateStyleSheet,
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// The current auto-slide duration
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autoSlide = 0,
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@ -1417,10 +1424,16 @@
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}
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// Reset all auto animated elements
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autoAnimatedRollbacks.forEach( function( rollback ) {
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rollback();
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toArray( dom.wrapper.querySelectorAll( '.slides .auto-animate-start' ) ).forEach( function( element ) {
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element.classList.remove( 'auto-animate-start' );
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} );
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autoAnimatedRollbacks = [];
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toArray( dom.wrapper.querySelectorAll( '[data-auto-animate-id]' ) ).forEach( function( element ) {
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element.removeAttribute( 'data-auto-animate-id' );
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} );
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if( autoAnimateStyleSheet && autoAnimateStyleSheet.parentNode ) {
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autoAnimateStyleSheet.parentNode.removeChild( autoAnimateStyleSheet );
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autoAnimateStyleSheet = null;
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}
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// Remove existing auto-slide controls
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if( autoSlidePlayer ) {
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@ -3036,8 +3049,8 @@
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currentSlide.style.transition = 'none';
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setTimeout( function() {
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previousSlide.style.transition = '';
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currentSlide.style.transition = '';
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if( previousSlide ) previousSlide.style.transition = '';
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if( currentSlide ) currentSlide.style.transition = '';
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}, 0 );
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}
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@ -3813,7 +3826,13 @@
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if( config.autoAnimate ) {
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var options = {
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// Lazily create the auto-animate stylesheet
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if( !autoAnimateStyleSheet ) {
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autoAnimateStyleSheet = document.createElement( 'style' );
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document.querySelector( 'head' ).appendChild( autoAnimateStyleSheet );
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}
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var animationOptions = {
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easing: config.autoAnimateEasing,
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duration: config.autoAnimateDuration,
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offsetY: 0
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@ -3823,22 +3842,34 @@
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// account for their difference in position when
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// calculating deltas for animated elements
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if( config.center ) {
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options.offsetY = fromSlide.offsetTop - toSlide.offsetTop;
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animationOptions.offsetY = fromSlide.offsetTop - toSlide.offsetTop;
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}
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// Check if easing is overriden
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if( toSlide.hasAttribute( 'data-auto-animate-easing' ) ) {
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options.easing = toSlide.getAttribute( 'data-auto-animate-easing' );
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animationOptions.easing = toSlide.getAttribute( 'data-auto-animate-easing' );
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}
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// Check if the duration is overriden
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if( toSlide.hasAttribute( 'data-auto-animate-duration' ) ) {
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options.duration = parseFloat( toSlide.getAttribute( 'data-auto-animate-duration' ) );
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animationOptions.duration = parseFloat( toSlide.getAttribute( 'data-auto-animate-duration' ) );
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}
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getAutoAnimatableElements( fromSlide, toSlide ).forEach( function( elements ) {
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autoAnimateElement( elements[0], elements[1], options );
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} );
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// Reset any prior animation
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fromSlide.classList.remove( 'auto-animate-start' );
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toSlide.classList.remove( 'auto-animate-start' );
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autoAnimateStyleSheet.innerHTML = '';
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// Generate and write out custom auto-animate styles to the DOM
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autoAnimateStyleSheet.innerHTML = getAutoAnimatableElements( fromSlide, toSlide ).map( function( elements, i ) {
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return getAutoAnimateCSS( elements[0], elements[1], elements[2] || {}, animationOptions, i );
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} ).join( '' );
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// Start the animation next cycle
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setTimeout( function() {
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toSlide.classList.add( 'auto-animate-start' );
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}, 0 );
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}
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@ -3850,41 +3881,60 @@
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*
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* @param {HTMLElement} from
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* @param {HTMLElement} to
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* @param {Object} options
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* @param {Object} options Optional settings for this specific pair
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* @param {Object} animationOptions Options that apply to all
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* elements in this transition
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*/
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function autoAnimateElement( from, to, options ) {
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function getAutoAnimateCSS( from, to, options, animationOptions, id ) {
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var fromProps = getAutoAnimatableProperties( from ),
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toProps = getAutoAnimatableProperties( to );
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// Each element gets a unique auto-animate ID
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to.setAttribute( 'data-auto-animate-id', id );
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var fromProps = getAutoAnimatableProperties( 'from', from, options ),
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toProps = getAutoAnimatableProperties( 'to', to, options );
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// Instantly move to the 'from' state
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fromProps.styles.push([ 'transition', 'none' ]);
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// transition to the 'to' state
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toProps.styles.push([ 'transition', 'all '+ animationOptions.duration +'s '+ animationOptions.easing ]);
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// If translation and/or scalin are enabled, offset the
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// 'to' element so that it starts out at the same position
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// and scale as the 'from' element
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if( options.translate !== false || options.scale !== false ) {
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var delta = {
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x: fromProps.x - toProps.x,
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y: fromProps.y - toProps.y + options.offsetY,
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y: fromProps.y - toProps.y + animationOptions.offsetY,
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scaleX: fromProps.width / toProps.width,
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scaleY: fromProps.height / toProps.height
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};
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to.style.transition = 'none';
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to.style.transform = 'translate('+delta.x+'px, '+delta.y+'px) scale('+delta.scaleX+','+delta.scaleY+')';
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to.classList.add( 'auto-animate-target' );
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var transform = [];
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config.autoAnimateStyles.forEach( function( propertyName ) {
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to.style[propertyName] = fromProps[propertyName];
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} );
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if( options.translate !== false ) transform.push( 'translate('+delta.x+'px, '+delta.y+'px)' );
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if( options.scale !== false ) transform.push( 'scale('+delta.scaleX+','+delta.scaleY+')' );
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setTimeout( function() {
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fromProps.styles.push([ 'transform', transform.join( ' ' ) ]);
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fromProps.styles.push([ 'transformOrigin', 'top left' ]);
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// Run the FLIP animation
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to.style.transition = '';
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to.style.transitionTimingFunction = options.easing;
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to.style.transitionDuration = options.duration + 's';
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to.style.transform = '';
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toProps.styles.push([ 'transform', 'none' ]);
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config.autoAnimateStyles.forEach( function( propertyName ) {
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to.style[propertyName] = toProps[propertyName];
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} );
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}
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}, 0 );
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// Build up our custom CSS. We need to override inline styles
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// so we need to make our styles vErY IMPORTANT!1!!
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var fromCSS = fromProps.styles.map( function( style ) {
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return style[0] + ': ' + style[1] + ' !important;';
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} ).join( '' );
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var toCSS = toProps.styles.map( function( style ) {
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return style[0] + ': ' + style[1] + ' !important;';
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} ).join( '' );
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return '.reveal [data-auto-animate-id="'+ id +'"] {\n'+ fromCSS +'\n}\n\n' +
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'.reveal .auto-animate-start [data-auto-animate-id="'+ id +'"] {\n'+ toCSS +'\n}\n\n';
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}
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@ -3893,53 +3943,52 @@
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* that can be auto-animated for the given element
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* and their respective values.
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*/
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function getAutoAnimatableProperties( element ) {
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function getAutoAnimatableProperties( direction, element, options ) {
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var properties = element._animatableProperties;
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if( !properties ) {
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properties = {};
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var properties = { styles: [] };
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// Position and size
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if( options.translate !== false || options.scale !== false ) {
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properties.x = element.offsetLeft;
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properties.y = element.offsetTop;
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properties.width = element.offsetWidth;
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properties.height = element.offsetHeight;
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}
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// Styles
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config.autoAnimateStyles.forEach( function( propertyName ) {
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properties[propertyName] = element.style[propertyName];
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} );
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var computedStyles;
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// Cache the list of properties
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element._animatableProperties = properties;
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// CSS styles
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( options.styles || config.autoAnimateStyles ).forEach( function( style ) {
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var value;
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// Provide a method for rolling back all changes made to this
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// element as part of auto-animating it
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autoAnimatedRollbacks.push( function( originalStyleAttribute ) {
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element.classList.remove( 'auto-animate-target' );
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element.style.transitionTimingFunction = '';
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element.style.transitionDuration = '';
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if( typeof originalStyleAttribute === 'string' ) {
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element.setAttribute( 'style', originalStyleAttribute );
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if( typeof style.from !== 'undefined' && direction === 'from' ) {
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value = style.from;
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}
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else if( typeof style.to !== 'undefined' && direction === 'to' ) {
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value = style.to;
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}
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else {
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element.removeAttribute( 'style' );
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value = element.style[style.property];
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if( value === '' && style.defaultValue === 'computed' ) {
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computedStyles = computedStyles || window.getComputedStyle( element );
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value = computedStyles[style.property];
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}
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}
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delete element._animatableProperties;
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}.bind( null, element.getAttribute( 'style' ) ) );
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if( value !== '' ) {
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properties.styles.push([ style.property, value ]);
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}
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} );
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return properties;
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}
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/**
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* [getAutoAnimatableElements description]
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* Get a list of all element pairs that we can animate
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* between the given slides.
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*
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* @param {HTMLElement} fromSlide
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* @param {HTMLElement} toSlide
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*
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@ -3949,26 +3998,25 @@
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*/
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function getAutoAnimatableElements( fromSlide, toSlide ) {
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var pairs = findImplicitAutoAnimatePairs( fromSlide, toSlide )
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.concat( findExplicitAutoAnimatePairs( fromSlide, toSlide ) );
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var matcher = typeof config.autoAnimateMatcher === 'function' ? config.autoAnimateMatcher : findAutoAnimatePairs;
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var pairs = matcher( fromSlide, toSlide );
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// Remove duplicate pairs
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pairs = pairs.filter( function( pair, index ) {
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return pairs.filter( function( pair, index ) {
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return index === pairs.findIndex( function( comparePair ) {
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return pair[0] === comparePair[0] && pair[1] === comparePair[1];
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} );
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} );
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return pairs;
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}
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/**
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* Returns an array of auto-animate element pairs
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* discovered through implicing means such as matching
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* text content.
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* Identifies matching elements between slides. You can specify
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* a custom matcher function by using the autoAnimateMatcher
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* config option.
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*/
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function findImplicitAutoAnimatePairs( fromSlide, toSlide ) {
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function findAutoAnimatePairs( fromSlide, toSlide ) {
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var pairs = [];
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@ -3991,6 +4039,11 @@
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};
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// Eplicit matches via data-id
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findMatches( '[data-id]', function( node ) {
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return node.nodeName + ':::' + node.getAttribute( 'data-id' );
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} );
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// Text
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findMatches( 'h1, h2, h3, h4, h5, h6, p, li, span', function( node ) {
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return node.nodeName + ':::' + node.innerText;
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@ -4012,29 +4065,6 @@
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}
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/**
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* Returns explicitly ID-matched auto-animate elements.
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*/
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function findExplicitAutoAnimatePairs( fromSlide, toSlide ) {
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var pairs = [];
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var fromHash = {};
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toArray( fromSlide.querySelectorAll( '[data-id]' ) ).forEach( function( fromElement ) {
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fromHash[ fromElement.getAttribute( 'data-id' ) ] = fromElement;
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} );
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toArray( toSlide.querySelectorAll( '[data-id]' ) ).forEach( function( toElement ) {
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var fromElement = fromHash[ toElement.getAttribute( 'data-id' ) ];
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if( fromElement ) {
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pairs.push([ fromElement, toElement ]);
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}
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} );
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return pairs;
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}
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/**
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* Should the given element be preloaded?
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* Decides based on local element attributes and global config.
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@ -21,7 +21,7 @@
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<section data-auto-animate>
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<h3>Auto-Matched Content (no IDs)</h3>
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<h3>This will fade out</h3>
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<p>This will fade out</p>
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<img src="assets/image1.png" style="height: 100px;">
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<pre><code class="hljs">
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function Example() {
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@ -29,9 +29,10 @@ function Example() {
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}
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</code></pre>
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</section>
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<section data-auto-animate>
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<section data-auto-animate data-auto-animate-unmatched="fade">
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<h3>Auto-Matched Content (no IDs)</h3>
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<h3 style="opacity: 0.2; margin-top: 200px;">This will fade out</h3>
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<p style="opacity: 0.2; margin-top: 200px;">This will fade out</p>
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<p>This element is unmatched</p>
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<img src="assets/image1.png" style="height: 100px;">
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<pre><code class="hljs">
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function Example() {
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