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new 'r-stack' helper class for stacking & centering multiple elements

edit
Hakim El Hattab 2020-05-11 10:54:02 +02:00
parent 1288a3280c
commit eeedaa17e1
7 changed files with 122 additions and 12 deletions
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19
css/reveal.scss
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@ -213,17 +213,32 @@ html.reveal-full-page {
position: relative; position: relative;
} }
.reveal .stretch { // Layout helper: Stretch an element vertically based on available space
.reveal .stretch,
.reveal .r-stretch {
max-width: none; max-width: none;
max-height: none; max-height: none;
} }
.reveal pre.stretch code { .reveal pre.stretch code,
.reveal pre.r-stretch code {
height: 100%; height: 100%;
max-height: 100%; max-height: 100%;
box-sizing: border-box; box-sizing: border-box;
} }
// Layout helper: Stack multiple elements on top of each other
.reveal .r-stack {
display: grid;
justify-content: center;
align-items: center;
}
.reveal .r-stack > * {
grid-area: 1/1;
margin: auto;
}
/********************************************* /*********************************************
* CONTROLS * CONTROLS

4
dist/reveal.css vendored
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2
dist/reveal.esm.js vendored
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92
examples/layout-helpers.html 100644
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@ -0,0 +1,92 @@
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>reveal.js - Layout Helpers</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="../dist/reveal.css">
<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
<link rel="stylesheet" href="../lib/css/monokai.css">
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h2>Layout Helper Examples</h2>
<ul>
<li><a href="#/stretch">Stretch</a></li>
<li><a href="#/stack">Stack</a></li>
</ul>
</section>
<section id="stretch">
<h2>Stretch</h2>
<p>Makes an element as tall as possible while remaining within the slide bounds.</p>
<pre><code class="html" data-trim data-line-numbers>
<h2>Stretch Example</h2>
<img src="assets/image2.png" class="r-stretch">
<p>Image byline</p>
</code></pre>
</section>
<section>
<h2>Stretch Example</h2>
<img src="assets/image2.png" class="r-stretch">
<p>Image byline</p>
</section>
<section id="stack">
<h2>Stack</h2>
<p>Stacks multiple elements on top of each other, for use with fragments.</p>
<pre><code class="html" data-trim data-line-numbers>
<div class="r-stack">
<img class="fragment" width="450" height="300" src="...">
<img class="fragment" width="300" height="450" src="...">
<img class="fragment" width="400" height="400" src="...">
</div>
</code></pre>
</section>
<section>
<h2>Stack Example</h2>
<div class="r-stack">
<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment">
<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment">
<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment">
</div>
</section>
<section>
<h2>Stack Example</h2>
<p>One at a time.</p>
<div class="r-stack">
<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment fade-out" data-fragment-index="0">
<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment current-visible" data-fragment-index="0">
<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment">
</div>
</section>
</div>
</div>
<script src="../dist/reveal.js"></script>
<script src="../dist/plugin/highlight.js"></script>
<script>
Reveal.initialize({
center: true,
hash: true,
plugins: [ RevealHighlight ]
});
</script>
</body>
</html>

11
js/config.js
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@ -72,15 +72,18 @@ export default {
keyboard: true, keyboard: true,
// Optional function that blocks keyboard events when retuning false // Optional function that blocks keyboard events when retuning false
//
// If you set this to 'foucsed', we will only capture keyboard events
// for embdedded decks when they are in focus
keyboardCondition: null, keyboardCondition: null,
// Disables the default reveal.js slide layout (scaling and centering)
// so that you can use custom CSS layout
disableLayout: false,
// Enable the slide overview mode // Enable the slide overview mode
overview: true, overview: true,
// Disables the default reveal.js slide layout so that you can use
// custom CSS layout
disableLayout: false,
// Vertical centering of slides // Vertical centering of slides
center: true, center: true,

4
js/reveal.js
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@ -892,8 +892,8 @@ export default function( revealElement, options ) {
*/ */
function layoutSlideContents( width, height ) { function layoutSlideContents( width, height ) {
// Handle sizing of elements with the 'stretch' class // Handle sizing of elements with the 'r-stretch' class
Util.queryAll( dom.slides, 'section > .stretch' ).forEach( element => { Util.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {
// Determine how much vertical space we can use // Determine how much vertical space we can use
let remainingHeight = Util.getRemainingHeight( element, height ); let remainingHeight = Util.getRemainingHeight( element, height );