From 81ba841fb8d2adf2d9fa7a68753daa93a3194778 Mon Sep 17 00:00:00 2001
From: tamaina <tamaina@hotmail.co.jp>
Date: Tue, 25 Jul 2023 19:44:52 +0900
Subject: perf(frontend): MkMediaListのアスペクト比制限を調整 (#11377)
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---
 packages/frontend/src/components/MkMediaList.vue | 63 +++++++++++++++++-------
 1 file changed, 44 insertions(+), 19 deletions(-)

(limited to 'packages/frontend/src/components')

diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index be0aed6524..65d3d529dd 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -1,5 +1,5 @@
 <template>
-<div>
+<div ref="root">
 	<XBanner v-for="media in mediaList.filter(media => !previewable(media))" :key="media.id" :media="media"/>
 	<div v-if="mediaList.filter(media => previewable(media)).length > 0" :class="$style.container">
 		<div
@@ -23,7 +23,7 @@
 </template>
 
 <script lang="ts" setup>
-import { onMounted, watch, shallowRef } from 'vue';
+import { onMounted, shallowRef } from 'vue';
 import * as misskey from 'misskey-js';
 import PhotoSwipeLightbox from 'photoswipe/lightbox';
 import PhotoSwipe from 'photoswipe';
@@ -34,19 +34,26 @@ import XVideo from '@/components/MkMediaVideo.vue';
 import * as os from '@/os';
 import { FILE_TYPE_BROWSERSAFE } from '@/const';
 import { defaultStore } from '@/store';
+import { getScrollContainer, getBodyScrollHeight } from '@/scripts/scroll';
 
 const props = defineProps<{
 	mediaList: misskey.entities.DriveFile[];
 	raw?: boolean;
 }>();
 
+const root = shallowRef<HTMLDivElement>();
+const container = shallowRef<HTMLElement | null | undefined>(undefined);
 const gallery = shallowRef<HTMLDivElement>();
 const pswpZIndex = os.claimZIndex('middle');
 document.documentElement.style.setProperty('--mk-pswp-root-z-index', pswpZIndex.toString());
 const count = $computed(() => props.mediaList.filter(media => previewable(media)).length);
 
+/**
+ * アスペクト比をmediaListWithOneImageAppearanceに基づいていい感じに調整する
+ * aspect-ratioではなくheightを使う
+ */
 function calcAspectRatio() {
-	if (!gallery.value) return;
+	if (!gallery.value || !root.value) return;
 
 	let img = props.mediaList[0];
 
@@ -55,28 +62,46 @@ function calcAspectRatio() {
 		return;
 	}
 
-	// アスペクト比上限設定では、横長の場合は高さを縮小させる
-	const ratioMax = (ratio: number) => `${Math.max(ratio, img.properties.width / img.properties.height).toString()} / 1`;
+	const width = gallery.value.clientWidth;
+
+	const heightMin = (ratio: number) => {
+		const imgResizeRatio = width / img.properties.width;
+		const imgDrawHeight = img.properties.height * imgResizeRatio;
+		const maxHeight = width * ratio;
+		const height = Math.min(imgDrawHeight, maxHeight);
+		if (_DEV_) console.log('Image height calculated:', { width, properties: img.properties, imgResizeRatio, imgDrawHeight, maxHeight, height });
+		return `${height}px`;
+	};
 
 	switch (defaultStore.state.mediaListWithOneImageAppearance) {
 		case '16_9':
-			gallery.value.style.aspectRatio = ratioMax(16 / 9);
+			gallery.value.style.height = heightMin(9 / 16);
 			break;
 		case '1_1':
-			gallery.value.style.aspectRatio = ratioMax(1);
+			gallery.value.style.height = heightMin(1);
 			break;
 		case '2_3':
-			gallery.value.style.aspectRatio = ratioMax(2 / 3);
+			gallery.value.style.height = heightMin(3 / 2);
 			break;
-		default:
-			gallery.value.style.aspectRatio = '';
+		default: {
+			if (!container.value) container.value = getScrollContainer(root.value);
+			const maxHeight = Math.max(64, (container.value ? container.value.clientHeight : getBodyScrollHeight()) * 0.5 || 360);
+			if (width === 0 || !maxHeight) return;
+			const imgResizeRatio = width / img.properties.width;
+			const imgDrawHeight = img.properties.height * imgResizeRatio;
+			gallery.value.style.height = `${Math.max(64, Math.min(imgDrawHeight, maxHeight))}px`;
+			gallery.value.style.minHeight = 'initial';
+			gallery.value.style.maxHeight = 'initial';
 			break;
+		}
 	}
-}
 
-watch([defaultStore.reactiveState.mediaListWithOneImageAppearance, gallery], () => calcAspectRatio());
+	gallery.value.style.aspectRatio = 'initial';
+}
 
 onMounted(() => {
+	calcAspectRatio();
+
 	const lightbox = new PhotoSwipeLightbox({
 		dataSource: props.mediaList
 			.filter(media => {
@@ -203,7 +228,7 @@ const previewable = (file: misskey.entities.DriveFile): boolean => {
 	&.n1 {
 		grid-template-rows: 1fr;
 
-		// default (expand)
+		// default but fallback (expand)
 		min-height: 64px;
 		max-height: clamp(
 			64px,
@@ -212,20 +237,20 @@ const previewable = (file: misskey.entities.DriveFile): boolean => {
 		);
 
 		&.n116_9 {
-			min-height: none;
-			max-height: none;
+			min-height: initial;
+			max-height: initial;
 			aspect-ratio: 16 / 9; // fallback
 		}
 
 		&.n11_1{
-			min-height: none;
-			max-height: none;
+			min-height: initial;
+			max-height: initial;
 			aspect-ratio: 1 / 1; // fallback
 		}
 
 		&.n12_3 {
-			min-height: none;
-			max-height: none;
+			min-height: initial;
+			max-height: initial;
 			aspect-ratio: 2 / 3; // fallback
 		}
 	}
-- 
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