From 0e6852bbee4c274d74de958bf451f4445e7cdb65 Mon Sep 17 00:00:00 2001
From: Kayden Tebau <me@nullob.si>
Date: Wed, 28 Sep 2022 21:21:07 -0700
Subject: [PATCH] Alt text in image viewer

---
 .../client/src/components/MkMediaImage.vue    |  2 +-
 .../client/src/components/MkMediaList.vue     | 64 ++++++++++++++++++-
 2 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/packages/client/src/components/MkMediaImage.vue b/packages/client/src/components/MkMediaImage.vue
index 73854352bf..c620b73c5f 100644
--- a/packages/client/src/components/MkMediaImage.vue
+++ b/packages/client/src/components/MkMediaImage.vue
@@ -13,7 +13,7 @@
 		:href="image.url"
 		:title="image.name"
 	>
-		<ImgWithBlurhash :hash="image.blurhash" :src="url" :alt="image.comment" :title="image.comment" :cover="false"/>
+		<ImgWithBlurhash :hash="image.blurhash" :src="url" :alt="image.comment || image.name" :title="image.comment || image.name" :cover="false"/>
 		<div v-if="image.type === 'image/gif'" class="gif">GIF</div>
 	</a>
 	<button v-tooltip="i18n.ts.hide" class="_button hide" @click="hide = true"><i class="ph-eye-slash-bold ph-lg"></i></button>
diff --git a/packages/client/src/components/MkMediaList.vue b/packages/client/src/components/MkMediaList.vue
index 17a039e720..174ed83809 100644
--- a/packages/client/src/components/MkMediaList.vue
+++ b/packages/client/src/components/MkMediaList.vue
@@ -46,7 +46,8 @@ onMounted(() => {
 					src: media.url,
 					w: media.properties.width,
 					h: media.properties.height,
-					alt: media.name,
+					alt: media.comment || media.name,
+					comment: media.comment,
 				};
 				if (media.properties.orientation != null && media.properties.orientation >= 5) {
 					[item.w, item.h] = [item.h, item.w];
@@ -89,9 +90,39 @@ onMounted(() => {
 			[itemData.w, itemData.h] = [itemData.h, itemData.w];
 		}
 		itemData.msrc = file.thumbnailUrl;
+		itemData.alt = file.comment || file.name;
+		itemData.comment = file.comment;
 		itemData.thumbCropped = true;
 	});
 
+	lightbox.on('uiRegister', () => {
+		lightbox.pswp.ui.registerElement({
+			name: 'altText',
+			className: 'pwsp__alt-text-container',
+			appendTo: 'wrapper',
+			onInit: (el, pwsp) => {
+				let textBox = document.createElement('p');
+				textBox.className = 'pwsp__alt-text';
+				el.appendChild(textBox);
+
+				let preventProp = function(ev: Event): void {
+					ev.stopPropagation();
+				};
+
+				// Allow scrolling/text selection
+				el.onwheel = preventProp;
+				el.onclick = preventProp;
+				el.onpointerdown = preventProp;
+				el.onpointercancel = preventProp;
+				el.onpointermove = preventProp;
+
+				pwsp.on('change', () => {
+					textBox.textContent = pwsp.currSlide.data.comment?.trim();
+				});
+			},
+		});
+	});
+
 	lightbox.init();
 });
 
@@ -193,4 +224,35 @@ const previewable = (file: misskey.entities.DriveFile): boolean => {
   //z-index: v-bind(pswpZIndex);
 	z-index: 2000000;
 }
+.pwsp__alt-text-container {
+	display: flex;
+	flex-direction: row;
+	align-items: center;
+
+	position: absolute;
+	bottom: 30px;
+	left: 50%;
+	transform: translateX(-50%);
+
+	width: 75%;
+}
+
+.pwsp__alt-text {
+	color: white;
+	margin: 0 auto;
+	text-align: center;
+	padding: 10px;
+	background: rgba(0, 0, 0, 0.5);
+	border-radius: 5px;
+
+	max-height: 10vh;
+	overflow-x: clip;
+	overflow-y: auto;
+	overscroll-behavior: contain;
+}
+
+.pwsp__alt-text:empty {
+	display: none;
+}
+
 </style>