add support image/video lightbox via data-preview-image/video, move o…

…verlay into standalone controller

css/reveal.scss

@@ -1432,6 +1432,11 @@ $controlsArrowAngleActive: 36deg;
 $overlayHeaderHeight: 40px;
 $overlayHeaderPadding: 5px;
 
+.reveal [data-preview-image],
+.reveal [data-preview-video] {
+	cursor: zoom-in;
+}
+
 .reveal > .overlay {
 	position: absolute;
 	top: 0;
@@ -1455,9 +1460,8 @@ $overlayHeaderPadding: 5px;
 	z-index: 10;
 	background-image: url(data:image/gif;base64,R0lGODlhIAAgAPMAAJmZmf%2F%2F%2F6%2Bvr8nJybW1tcDAwOjo6Nvb26ioqKOjo7Ozs%2FLy8vz8%2FAAAAAAAAAAAACH%2FC05FVFNDQVBFMi4wAwEAAAAh%2FhpDcmVhdGVkIHdpdGggYWpheGxvYWQuaW5mbwAh%2BQQJCgAAACwAAAAAIAAgAAAE5xDISWlhperN52JLhSSdRgwVo1ICQZRUsiwHpTJT4iowNS8vyW2icCF6k8HMMBkCEDskxTBDAZwuAkkqIfxIQyhBQBFvAQSDITM5VDW6XNE4KagNh6Bgwe60smQUB3d4Rz1ZBApnFASDd0hihh12BkE9kjAJVlycXIg7CQIFA6SlnJ87paqbSKiKoqusnbMdmDC2tXQlkUhziYtyWTxIfy6BE8WJt5YJvpJivxNaGmLHT0VnOgSYf0dZXS7APdpB309RnHOG5gDqXGLDaC457D1zZ%2FV%2FnmOM82XiHRLYKhKP1oZmADdEAAAh%2BQQJCgAAACwAAAAAIAAgAAAE6hDISWlZpOrNp1lGNRSdRpDUolIGw5RUYhhHukqFu8DsrEyqnWThGvAmhVlteBvojpTDDBUEIFwMFBRAmBkSgOrBFZogCASwBDEY%2FCZSg7GSE0gSCjQBMVG023xWBhklAnoEdhQEfyNqMIcKjhRsjEdnezB%2BA4k8gTwJhFuiW4dokXiloUepBAp5qaKpp6%2BHo7aWW54wl7obvEe0kRuoplCGepwSx2jJvqHEmGt6whJpGpfJCHmOoNHKaHx61WiSR92E4lbFoq%2BB6QDtuetcaBPnW6%2BO7wDHpIiK9SaVK5GgV543tzjgGcghAgAh%2BQQJCgAAACwAAAAAIAAgAAAE7hDISSkxpOrN5zFHNWRdhSiVoVLHspRUMoyUakyEe8PTPCATW9A14E0UvuAKMNAZKYUZCiBMuBakSQKG8G2FzUWox2AUtAQFcBKlVQoLgQReZhQlCIJesQXI5B0CBnUMOxMCenoCfTCEWBsJColTMANldx15BGs8B5wlCZ9Po6OJkwmRpnqkqnuSrayqfKmqpLajoiW5HJq7FL1Gr2mMMcKUMIiJgIemy7xZtJsTmsM4xHiKv5KMCXqfyUCJEonXPN2rAOIAmsfB3uPoAK%2B%2BG%2Bw48edZPK%2BM6hLJpQg484enXIdQFSS1u6UhksENEQAAIfkECQoAAAAsAAAAACAAIAAABOcQyEmpGKLqzWcZRVUQnZYg1aBSh2GUVEIQ2aQOE%2BG%2BcD4ntpWkZQj1JIiZIogDFFyHI0UxQwFugMSOFIPJftfVAEoZLBbcLEFhlQiqGp1Vd140AUklUN3eCA51C1EWMzMCezCBBmkxVIVHBWd3HHl9JQOIJSdSnJ0TDKChCwUJjoWMPaGqDKannasMo6WnM562R5YluZRwur0wpgqZE7NKUm%2BFNRPIhjBJxKZteWuIBMN4zRMIVIhffcgojwCF117i4nlLnY5ztRLsnOk%2BaV%2BoJY7V7m76PdkS4trKcdg0Zc0tTcKkRAAAIfkECQoAAAAsAAAAACAAIAAABO4QyEkpKqjqzScpRaVkXZWQEximw1BSCUEIlDohrft6cpKCk5xid5MNJTaAIkekKGQkWyKHkvhKsR7ARmitkAYDYRIbUQRQjWBwJRzChi9CRlBcY1UN4g0%2FVNB0AlcvcAYHRyZPdEQFYV8ccwR5HWxEJ02YmRMLnJ1xCYp0Y5idpQuhopmmC2KgojKasUQDk5BNAwwMOh2RtRq5uQuPZKGIJQIGwAwGf6I0JXMpC8C7kXWDBINFMxS4DKMAWVWAGYsAdNqW5uaRxkSKJOZKaU3tPOBZ4DuK2LATgJhkPJMgTwKCdFjyPHEnKxFCDhEAACH5BAkKAAAALAAAAAAgACAAAATzEMhJaVKp6s2nIkolIJ2WkBShpkVRWqqQrhLSEu9MZJKK9y1ZrqYK9WiClmvoUaF8gIQSNeF1Er4MNFn4SRSDARWroAIETg1iVwuHjYB1kYc1mwruwXKC9gmsJXliGxc%2BXiUCby9ydh1sOSdMkpMTBpaXBzsfhoc5l58Gm5yToAaZhaOUqjkDgCWNHAULCwOLaTmzswadEqggQwgHuQsHIoZCHQMMQgQGubVEcxOPFAcMDAYUA85eWARmfSRQCdcMe0zeP1AAygwLlJtPNAAL19DARdPzBOWSm1brJBi45soRAWQAAkrQIykShQ9wVhHCwCQCACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiRMDjI0Fd30%2FiI2UA5GSS5UDj2l6NoqgOgN4gksEBgYFf0FDqKgHnyZ9OX8HrgYHdHpcHQULXAS2qKpENRg7eAMLC7kTBaixUYFkKAzWAAnLC7FLVxLWDBLKCwaKTULgEwbLA4hJtOkSBNqITT3xEgfLpBtzE%2FjiuL04RGEBgwWhShRgQExHBAAh%2BQQJCgAAACwAAAAAIAAgAAAE7xDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfZiCqGk5dTESJeaOAlClzsJsqwiJwiqnFrb2nS9kmIcgEsjQydLiIlHehhpejaIjzh9eomSjZR%2BipslWIRLAgMDOR2DOqKogTB9pCUJBagDBXR6XB0EBkIIsaRsGGMMAxoDBgYHTKJiUYEGDAzHC9EACcUGkIgFzgwZ0QsSBcXHiQvOwgDdEwfFs0sDzt4S6BK4xYjkDOzn0unFeBzOBijIm1Dgmg5YFQwsCMjp1oJ8LyIAACH5BAkKAAAALAAAAAAgACAAAATwEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GGl6NoiPOH16iZKNlH6KmyWFOggHhEEvAwwMA0N9GBsEC6amhnVcEwavDAazGwIDaH1ipaYLBUTCGgQDA8NdHz0FpqgTBwsLqAbWAAnIA4FWKdMLGdYGEgraigbT0OITBcg5QwPT4xLrROZL6AuQAPUS7bxLpoWidY0JtxLHKhwwMJBTHgPKdEQAACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GAULDJCRiXo1CpGXDJOUjY%2BYip9DhToJA4RBLwMLCwVDfRgbBAaqqoZ1XBMHswsHtxtFaH1iqaoGNgAIxRpbFAgfPQSqpbgGBqUD1wBXeCYp1AYZ19JJOYgH1KwA4UBvQwXUBxPqVD9L3sbp2BNk2xvvFPJd%2BMFCN6HAAIKgNggY0KtEBAAh%2BQQJCgAAACwAAAAAIAAgAAAE6BDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfYIDMaAFdTESJeaEDAIMxYFqrOUaNW4E4ObYcCXaiBVEgULe0NJaxxtYksjh2NLkZISgDgJhHthkpU4mW6blRiYmZOlh4JWkDqILwUGBnE6TYEbCgevr0N1gH4At7gHiRpFaLNrrq8HNgAJA70AWxQIH1%2BvsYMDAzZQPC9VCNkDWUhGkuE5PxJNwiUK4UfLzOlD4WvzAHaoG9nxPi5d%2BjYUqfAhhykOFwJWiAAAIfkECQoAAAAsAAAAACAAIAAABPAQyElpUqnqzaciSoVkXVUMFaFSwlpOCcMYlErAavhOMnNLNo8KsZsMZItJEIDIFSkLGQoQTNhIsFehRww2CQLKF0tYGKYSg%2BygsZIuNqJksKgbfgIGepNo2cIUB3V1B3IvNiBYNQaDSTtfhhx0CwVPI0UJe0%2Bbm4g5VgcGoqOcnjmjqDSdnhgEoamcsZuXO1aWQy8KAwOAuTYYGwi7w5h%2BKr0SJ8MFihpNbx%2B4Erq7BYBuzsdiH1jCAzoSfl0rVirNbRXlBBlLX%2BBP0XJLAPGzTkAuAOqb0WT5AH7OcdCm5B8TgRwSRKIHQtaLCwg1RAAAOwAAAAAAAAAAAA%3D%3D);
 
-	visibility: visible;
-	opacity: 0.6;
-	transition: all 0.3s ease;
+	visibility: hidden;
+	opacity: 0;
 }
 
 .reveal .overlay-header {
@@ -1471,20 +1475,27 @@ $overlayHeaderPadding: 5px;
 	box-sizing: border-box;
 	align-items: center;
 	justify-content: flex-end;
+	gap: 6px;
 }
-.reveal .overlay-header a {
+.reveal .overlay-header .overlay-button {
+	all: unset;
 	display: flex;
 	align-items: center;
 	justify-content: center;
-	width: $overlayHeaderHeight;
-	height: $overlayHeaderHeight;
+	min-width: $overlayHeaderHeight;
+	min-height: $overlayHeaderHeight;
 	padding: 0 10px;
-	opacity: 0.6;
+	opacity: 1;
+	border-radius: 6px;
+	font-size: 18px;
+	gap: 8px;
+	cursor: pointer;
 
 	box-sizing: border-box;
 }
-.reveal .overlay-header a:hover {
+.reveal .overlay-header .overlay-button:hover {
 	opacity: 1;
+	background-color: rgba( 255, 255, 255, 0.15 );
 }
 .reveal .overlay-header .icon {
 	display: inline-block;
@@ -1504,14 +1515,16 @@ $overlayHeaderPadding: 5px;
 
 .reveal .overlay-viewport {
 	position: absolute;
-	display: flex;
+	display: grid;
+	place-items: center;
 	top: $overlayHeaderHeight + $overlayHeaderPadding*2;
-	right: 10px;
-	bottom: 10px;
-	left: 10px;
-	border-radius: 10px;
+	right: 6px;
+	bottom: 6px;
+	left: 6px;
+	border-radius: 6px;
 	overflow: hidden;
 	background-color: rgba(20, 20, 20, 0.8);
+	color: #fff;
 }
 
 // Preview overlay
@@ -1527,12 +1540,38 @@ $overlayHeaderPadding: 5px;
 	transition: all 0.3s ease;
 }
 
-.reveal .overlay-preview.loaded iframe {
+.reveal .overlay-preview[data-state="loaded"] iframe {
 	opacity: 1;
 	visibility: visible;
 }
 
-.reveal .overlay-preview.loaded .overlay-viewport-inner  {
+.reveal .overlay-preview img,
+.reveal .overlay-preview video {
+	position: absolute;
+	max-width: 100%;
+	max-height: 100%;
+	width: 100%;
+	height: 100%;
+	margin: 0;
+	object-fit: none;
+}
+
+.reveal .overlay-preview[data-object-fit="none"] img,
+.reveal .overlay-preview[data-object-fit="none"] video {
+	object-fit: none;
+}
+
+.reveal .overlay-preview[data-object-fit="contain"] img,
+.reveal .overlay-preview[data-object-fit="contain"] video {
+	object-fit: contain;
+}
+
+.reveal .overlay-preview[data-object-fit="cover"] img,
+.reveal .overlay-preview[data-object-fit="cover"] video {
+	object-fit: cover;
+}
+
+.reveal .overlay-preview[data-state="loaded"] .overlay-viewport-inner  {
 	position: absolute;
 	z-index: -1;
 	left: 0;
@@ -1541,55 +1580,57 @@ $overlayHeaderPadding: 5px;
 	text-align: center;
 	letter-spacing: normal;
 }
+.reveal .overlay-preview .overlay-error {
+	font-size: 18px;
+	color: orange;
+}
+
 .reveal .overlay-preview .x-frame-error  {
 	opacity: 0;
 	transition: opacity 0.3s ease 0.3s;
 }
-.reveal .overlay-preview.loaded .x-frame-error  {
+.reveal .overlay-preview[data-state="loaded"] .x-frame-error  {
 	opacity: 1;
 }
 
-.reveal .overlay-preview.loaded .overlay-spinner {
-	opacity: 0;
-	visibility: hidden;
-	transform: scale(0.2);
+.reveal .overlay-preview[data-state="loading"] .overlay-spinner {
+	opacity: 0.6;
+	visibility: visible;
 }
 
 // Help overlay
 .reveal .overlay-help .overlay-viewport {
 	overflow: auto;
-	color: #fff;
-	display: grid;
-	place-items: center;
 }
 
-.reveal .overlay-help .overlay-viewport-inner {
-	width: 600px;
+.reveal .overlay-help-content {
+	width: 100%;
+	max-width: 600px;
 	margin: auto;
 	text-align: center;
 	letter-spacing: normal;
 }
 
-.reveal .overlay-help .overlay-viewport-inner .title {
+.reveal .overlay-help-content .title {
 	font-size: 20px;
 	margin-top: 0;
 }
 
-.reveal .overlay-help .overlay-viewport-inner table {
+.reveal .overlay-help-content table {
 	border: 1px solid #fff;
 	border-collapse: collapse;
 	font-size: 16px;
 }
 
-.reveal .overlay-help .overlay-viewport-inner table th,
-.reveal .overlay-help .overlay-viewport-inner table td {
+.reveal .overlay-help-content table th,
+.reveal .overlay-help-content table td {
 	width: 200px;
 	padding: 14px;
 	border: 1px solid #fff;
 	vertical-align: middle;
 }
 
-.reveal .overlay-help .overlay-viewport-inner table th {
+.reveal .overlay-help-content table th {
 	padding-top: 20px;
 	padding-bottom: 20px;
 }

examples/preview-overlays.html

@@ -0,0 +1,102 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Slide Transitions</title>
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/black.css" id="theme">
+
+		<style>
+			.reveal {
+				font-size: 24px;
+			}
+			.reveal figure {
+				margin: 0 0 1rem 0;
+				text-align: left;
+			}
+			.reveal figure img,
+			.reveal figure video {
+				margin: 0.25rem 0 0 0;
+			}
+			figcaption, a {
+				font-size: 16px;
+			}
+		</style>
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section>
+
+					<h2>Preview Overlays</h2>
+
+					<div class="r-hstack items-start">
+						<div class="r-vstack items-start">
+							<h5>Images</h5>
+							<figure>
+								<figcaption>Preview with default settings:</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image>
+							</figure>
+							<figure>
+								<figcaption>Preview with data-object-fit="contain"</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/a.png" data-preview-image data-object-fit="contain">
+							</figure>
+							<figure>
+								<figcaption>Preview another image (c)</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/b.png" data-preview-image="https://static.slid.es/images/alphabet/v1/c.png">
+							</figure>
+							<a href="#" data-preview-image="https://static.slid.es/images/alphabet/v1/x.png">
+								Preview image from a link.
+							</a>
+						</div>
+
+						<div style="width: 1px; height: 30vh; margin: 0 3rem;background-color: #999;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Videos</h5>
+							<figure>
+								<figcaption>Preview video</figcaption>
+								<img height="50" src="https://static.slid.es/images/alphabet/v1/x.png" data-preview-video="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4">
+							</figure>
+							<figure>
+								<figcaption>Preview video</figcaption>
+								<video height="50" src="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4" data-preview-video></video>
+							</figure>
+							<a href="#" data-preview-video="https://static.slid.es/site/homepage/v1/homepage-video-editor.mp4">
+								Preview video from a link.
+							</a>
+						</div>
+
+						<div style="width: 1px; height: 30vh; margin: 0 3rem;background-color: #999;"></div>
+
+						<div class="r-vstack items-start">
+							<h5>Iframes</h5>
+							<a data-preview-link href="https://hakim.se">https://hakim.se | data-preview-link</a>
+							<a data-preview-link="false" href="https://hakim.se">https://hakim.se | data-preview-link=false</a>
+						</div>
+					</div>
+
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script>
+			Reveal.initialize({
+				previewLinks: true,
+				width: 1280,
+				height: 720
+			});
+		</script>
+
+	</body>
+</html>