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refactored and improved auto-animate matcher, supports line-by-line code animations

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This commit is contained in:
Hakim El Hattab 2020-02-28 16:13:28 +01:00
parent 345ec01f19
commit e2a2c2c022
4 changed files with 179 additions and 39 deletions
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9
css/reveal.css
View file

@ -1233,6 +1233,9 @@ body {
/*********************************************
* AUTO ANIMATE
*********************************************/
.reveal [data-auto-animate-target="unmatched"] {
will-change: opacity; }
.reveal section[data-auto-animate]:not(.stack):not([data-auto-animate="running"]) [data-auto-animate-target="unmatched"] {
opacity: 0; }
@ -1515,6 +1518,12 @@ body {
width: 100%;
box-sizing: border-box; }
.reveal pre[data-auto-animate-target] {
overflow: hidden; }
.reveal pre[data-auto-animate-target] code {
height: 100%; }
/*********************************************
* ROLLING LINKS
*********************************************/

11
css/reveal.scss
View file

@ -1318,6 +1318,10 @@ $controlsArrowAngleActive: 36deg;
* AUTO ANIMATE
*********************************************/
.reveal [data-auto-animate-target="unmatched"] {
will-change: opacity;
}
.reveal section[data-auto-animate]:not(.stack):not([data-auto-animate="running"]) [data-auto-animate-target="unmatched"] {
opacity: 0;
}
@ -1663,6 +1667,13 @@ $controlsArrowAngleActive: 36deg;
box-sizing: border-box;
}
.reveal pre[data-auto-animate-target] {
overflow: hidden;
}
.reveal pre[data-auto-animate-target] code {
height: 100%;
}
/*********************************************
* ROLLING LINKS

163
js/reveal.js
View file

@ -3058,7 +3058,7 @@
cueAutoSlide();
// Auto-animation
if( slideChanged && previousSlide && currentSlide ) {
if( slideChanged && previousSlide && currentSlide && !isOverview() ) {
// Skip the slide transition between our two slides
// when auto-animating individual elements
@ -4028,6 +4028,7 @@
// Animate towards the 'to' state
toProps.styles['transition'] = 'all '+ options.duration +'s '+ options.easing + ' ' + options.delay + 's';
toProps.styles['transition-property'] = toStyleProperties.join( ', ' );
toProps.styles['will-change'] = toStyleProperties.join( ', ' );
// Build up our custom CSS. We need to override inline styles
// so we need to make our styles vErY IMPORTANT!1!!
@ -4162,15 +4163,18 @@
*/
function getAutoAnimatableElements( fromSlide, toSlide ) {
var matcher = typeof config.autoAnimateMatcher === 'function' ? config.autoAnimateMatcher : findAutoAnimatePairs;
var matcher = typeof config.autoAnimateMatcher === 'function' ? config.autoAnimateMatcher : getAutoAnimatePairs;
var pairs = matcher( fromSlide, toSlide );
var reserved = [];
// Remove duplicate pairs
return pairs.filter( function( pair, index ) {
return index === pairs.findIndex( function( comparePair ) {
return pair.from === comparePair.from && pair.to === comparePair.to;
} );
if( reserved.indexOf( pair.to ) === -1 ) {
reserved.push( pair.to );
return true;
}
} );
}
@ -4181,64 +4185,67 @@
* You can specify a custom matcher function by using
* the `autoAnimateMatcher` config option.
*/
function findAutoAnimatePairs( fromSlide, toSlide ) {
function getAutoAnimatePairs( fromSlide, toSlide ) {
var pairs = [];
var findMatches = function( selector, serializer, transformer ) {
var fromHash = {};
toArray( fromSlide.querySelectorAll( selector ) ).forEach( function( element ) {
if( typeof transformer === 'function' ) element = transformer( element );
fromHash[ serializer( element ) ] = element;
} );
toArray( toSlide.querySelectorAll( selector ) ).forEach( function( element ) {
if( typeof transformer === 'function' ) element = transformer( element );
var fromElement = fromHash[ serializer( element ) ];
if( fromElement ) {
pairs.push({ from: fromElement, to: element });
}
} );
};
var textNodes = 'h1, h2, h3, h4, h5, h6, p, li, span';
var codeNodes = 'pre';
var textNodes = 'h1, h2, h3, h4, h5, h6, p, li';
var mediaNodes = 'img, video, iframe';
// Eplicit matches via data-id
findMatches( '[data-id]', function( node ) {
findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', function( node ) {
return node.nodeName + ':::' + node.getAttribute( 'data-id' );
} );
// Text
findMatches( textNodes, function( node ) {
findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, function( node ) {
return node.nodeName + ':::' + node.innerText;
}, null );
} );
// Media
findMatches( mediaNodes, function( node ) {
findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, function( node ) {
return node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );
} );
// Code
findMatches( 'pre>code', function( node ) {
findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, function( node ) {
return node.nodeName + ':::' + node.innerText;
}, function( element ) {
return element.parentNode;
} );
pairs.forEach( function( pair ) {
var fromElement = pair.from;
var matchesMethod = fromElement.matches || fromElement.matchesSelector || fromElement.msMatchesSelector;
// Disable scale transformations on text nodes, we transiition
// each individual text property instead
if( matchesMethod.call( fromElement, textNodes ) ) {
if( pair.from.matches( textNodes ) ) {
pair.options = { scale: false };
}
// Animate individual lines of code
else if( pair.from.matches( codeNodes ) ) {
// Transition the code block's width and height instead of scaling
// to prevent its content from being squished
pair.options = { scale: false, styles: [ 'width', 'height' ] };
// Lines of code
findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', function( node ) {
return node.textContent;
}, {
scale: false,
styles: [],
measure: getLocalBoundingBox
} );
// Line numbers
findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', function( node ) {
return node.getAttribute( 'data-line-number' );
}, {
scale: false,
styles: [ 'width' ],
measure: getLocalBoundingBox
} );
}
} );
@ -4246,6 +4253,88 @@
}
/**
* Helper method which returns a bounding box based on
* the given elements offset coordinates.
*
* @param {HTMLElement} element
* @return {Object} x, y, width, height
*/
function getLocalBoundingBox( element ) {
var presentationScale = Reveal.getScale();
return {
x: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,
y: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,
width: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,
height: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100
};
}
/**
* Finds matching elements between two slides.
*
* @param {Array} pairs List of pairs to push matches to
* @param {HTMLElement} fromScope Scope within the from element exists
* @param {HTMLElement} toScope Scope within the to element exists
* @param {String} selector CSS selector of the element to match
* @param {Function} serializer A function that accepts an element and returns
* a stringified ID based on its contents
* @param {Object} animationOptions Optional config options for this pair
*/
function findAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {
var fromMatches = {};
var toMatches = {};
[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( function( element, i ) {
var key = serializer( element );
if( typeof key === 'string' && key.length ) {
fromMatches[key] = fromMatches[key] || [];
fromMatches[key].push( element );
}
} );
[].slice.call( toScope.querySelectorAll( selector ) ).forEach( function( element, i ) {
var key = serializer( element );
toMatches[key] = toMatches[key] || [];
toMatches[key].push( element );
var fromElement;
// Retrieve the 'from' element
if( fromMatches[key] ) {
var pimaryIndex = toMatches[key].length - 1;
var secondaryIndex = fromMatches[key].length - 1;
// If there are multiple identical from elements, retrieve
// the one at the same index as our to-element.
if( fromMatches[key][ pimaryIndex ] ) {
fromElement = fromMatches[key][ pimaryIndex ];
fromMatches[key][ pimaryIndex ] = null;
}
// If there are no matching from-elements at the same index,
// use the last one.
else if( fromMatches[key][ secondaryIndex ] ) {
fromElement = fromMatches[key][ secondaryIndex ];
fromMatches[key][ secondaryIndex ] = null;
}
}
// If we've got a matching pair, push it to the list of pairs
if( fromElement ) {
pairs.push({
from: fromElement,
to: element,
options: animationOptions
});
}
} );
}
/**
* Returns a all elements within the given scope that should
* be considered unmatched in an auto-animate transition. If

35
test/examples/auto-animate.html
View file

@ -23,7 +23,7 @@
<h3>Auto-Animate Example</h3>
<p>This will fade out</p>
<img src="assets/image1.png" style="height: 100px;">
<pre><code class="hljs" data-trim>
<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
function Example() {
const [count, setCount] = useState(0);
}
@ -34,8 +34,9 @@
<p style="opacity: 0.2; margin-top: 200px;">This will fade out</p>
<p>This element is unmatched</p>
<img src="assets/image1.png" style="height: 100px;">
<pre><code class="hljs" data-trim>
<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
function Example() {
New line!
const [count, setCount] = useState(0);
}
</code></pre>
@ -48,6 +49,36 @@
<p data-id="text-props" style="background: #555; line-height: 3em; letter-spacing: 0.2em;">Line Height & Letter Spacing</p>
</section>
<section data-auto-animate>
<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
import React, { useState } from 'react';
function Example() {
const [count, setCount] = useState(0);
return (
...
);
}
</code></pre>
</section>
<section data-auto-animate>
<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
function Example() {
const [count, setCount] = useState(0);
return (
&lt;div&gt;
&lt;p&gt;You clicked {count} times&lt;/p&gt;
&lt;button onClick={() =&gt; setCount(count + 1)}&gt;
Click me
&lt;/button&gt;
&lt;/div&gt;
);
}
</code></pre>
</section>
<section>
<section data-auto-animate>
<h3>Swapping list items</h3>