enhance(frontend): ウェルカムタイムラインのデザインを調整 (#14156)

* enhance(frontend): 非ログイン時のハイライトTLのデザイン調整

* Update Changelog

* fix cw handling

* ホバーしてたらスクロールを止めるように

* fix

* lint

3 files changed, 162 insertions, 46 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index aec4e1868c..259420a6c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 
 ### Client
 - Enhance: 内蔵APIドキュメントのデザイン・パフォーマンスを改善
+- Enhance: 非ログイン時のハイライトTLのデザインを改善
 - Fix: `/about#federation` ページなどで各インスタンスのチャートが表示されなくなっていた問題を修正
 - Fix: ユーザーページの追加情報のラベルを投稿者のサーバーの絵文字で表示する (#13968)
 - Fix: リバーシの対局を正しく共有できないことがある問題を修正
diff --git a/packages/frontend/src/pages/welcome.timeline.note.vue b/packages/frontend/src/pages/welcome.timeline.note.vue
new file mode 100644
index 0000000000..f385938343
--- /dev/null
+++ b/packages/frontend/src/pages/welcome.timeline.note.vue
@@ -0,0 +1,109 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :key="note.id" :class="$style.note">
+	<div class="_panel _gaps_s" :class="$style.content">
+		<div v-if="note.cw != null" :class="$style.richcontent">
+			<div><Mfm :text="note.cw" :author="note.user"/></div>
+			<MkCwButton v-model="showContent" :text="note.text" :renote="note.renote" :files="note.files" :poll="note.poll" style="margin: 4px 0;"/>
+			<div v-if="showContent">
+				<MkA v-if="note.replyId" class="reply" :to="`/notes/${note.replyId}`"><i class="ti ti-arrow-back-up"></i></MkA>
+				<Mfm v-if="note.text" :text="note.text" :author="note.user"/>
+				<MkA v-if="note.renoteId" class="rp" :to="`/notes/${note.renoteId}`">RN: ...</MkA>
+			</div>
+		</div>
+		<div v-else ref="noteTextEl" :class="[$style.text, { [$style.collapsed]: shouldCollapse }]">
+			<MkA v-if="note.replyId" class="reply" :to="`/notes/${note.replyId}`"><i class="ti ti-arrow-back-up"></i></MkA>
+			<Mfm v-if="note.text" :text="note.text" :author="note.user"/>
+			<MkA v-if="note.renoteId" class="rp" :to="`/notes/${note.renoteId}`">RN: ...</MkA>
+		</div>
+		<div v-if="note.files && note.files.length > 0" :class="$style.richcontent">
+			<MkMediaList :mediaList="note.files.slice(0, 4)"/>
+		</div>
+		<div v-if="note.poll">
+			<MkPoll :noteId="note.id" :poll="note.poll" :readOnly="true"/>
+		</div>
+		<div v-if="note.reactionCount > 0" :class="$style.reactions">
+			<MkReactionsViewer :note="note" :maxNumber="16"/>
+		</div>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { ref, shallowRef, onUpdated, onMounted } from 'vue';
+import * as Misskey from 'misskey-js';
+import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
+import MkMediaList from '@/components/MkMediaList.vue';
+import MkPoll from '@/components/MkPoll.vue';
+import MkCwButton from '@/components/MkCwButton.vue';
+
+defineProps<{
+	note: Misskey.entities.Note;
+}>();
+
+const noteTextEl = shallowRef<HTMLDivElement>();
+const shouldCollapse = ref(false);
+const showContent = ref(false);
+
+function calcCollapse() {
+	if (noteTextEl.value) {
+		const height = noteTextEl.value.scrollHeight;
+		if (height > 200) {
+			shouldCollapse.value = true;
+		}
+	}
+}
+
+onMounted(() => {
+	calcCollapse();
+});
+
+onUpdated(() => {
+	calcCollapse();
+});
+</script>
+
+<style lang="scss" module>
+.note {
+	margin-left: auto;
+}
+
+.text {
+	position: relative;
+	max-height: 200px;
+	overflow: hidden;
+
+	&.collapsed::after {
+		content: '';
+		position: absolute;
+		bottom: 0;
+		left: 0;
+		width: 100%;
+		height: 64px;
+		background: linear-gradient(0deg, var(--panel), var(--X15));
+	}
+}
+
+.content {
+	padding: 16px;
+	margin: 0 0 0 auto;
+	max-width: max-content;
+	border-radius: 16px;
+}
+
+.reactions {
+	box-sizing: border-box;
+	margin: 8px -16px -8px;
+	padding: 8px 16px 0;
+	width: calc(100% + 32px);
+	border-top: 1px solid var(--divider);
+}
+
+.richcontent {
+	min-width: 250px;
+}
+</style>
diff --git a/packages/frontend/src/pages/welcome.timeline.vue b/packages/frontend/src/pages/welcome.timeline.vue
index 139b2e0a07..db326f9e6c 100644
--- a/packages/frontend/src/pages/welcome.timeline.vue
+++ b/packages/frontend/src/pages/welcome.timeline.vue
@@ -4,24 +4,17 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="$style.root">
-	<div ref="scrollEl" :class="[$style.scrollbox, { [$style.scroll]: isScrolling }]">
-		<div v-for="note in notes" :key="note.id" :class="$style.note">
-			<div class="_panel" :class="$style.content">
-				<div>
-					<MkA v-if="note.replyId" class="reply" :to="`/notes/${note.replyId}`"><i class="ti ti-arrow-back-up"></i></MkA>
-					<Mfm v-if="note.text" :text="note.text" :author="note.user"/>
-					<MkA v-if="note.renoteId" class="rp" :to="`/notes/${note.renoteId}`">RN: ...</MkA>
-				</div>
-				<div v-if="note.files.length > 0" :class="$style.richcontent">
-					<MkMediaList :mediaList="note.files"/>
-				</div>
-				<div v-if="note.poll">
-					<MkPoll :noteId="note.id" :poll="note.poll" :readOnly="true"/>
-				</div>
-			</div>
-			<MkReactionsViewer ref="reactionsViewer" :note="note"/>
-		</div>
+<div :class="$style.root" class="_gaps">
+	<div
+		ref="notesMainContainerEl"
+		class="_gaps"
+		:class="[$style.scrollBoxMain, { [$style.scrollIntro]: (scrollState === 'intro'), [$style.scrollLoop]: (scrollState === 'loop') }]"
+		@animationend="changeScrollState"
+	>
+		<XNote v-for="note in notes" :key="`${note.id}_1`" :class="$style.note" :note="note"/>
+	</div>
+	<div v-if="isScrolling" class="_gaps" :class="[$style.scrollBoxSub, { [$style.scrollIntro]: (scrollState === 'intro'), [$style.scrollLoop]: (scrollState === 'loop') }]">
+		<XNote v-for="note in notes" :key="`${note.id}_2`" :class="$style.note" :note="note"/>
 	</div>
 </div>
 </template>
@@ -29,43 +22,54 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import * as Misskey from 'misskey-js';
 import { onUpdated, ref, shallowRef } from 'vue';
-import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
-import MkMediaList from '@/components/MkMediaList.vue';
-import MkPoll from '@/components/MkPoll.vue';
+import XNote from '@/pages/welcome.timeline.note.vue';
 import { misskeyApiGet } from '@/scripts/misskey-api.js';
 import { getScrollContainer } from '@/scripts/scroll.js';
 
 const notes = ref<Misskey.entities.Note[]>([]);
 const isScrolling = ref(false);
-const scrollEl = shallowRef<HTMLElement>();
+const scrollState = ref<null | 'intro' | 'loop'>(null);
+const notesMainContainerEl = shallowRef<HTMLElement>();
 
 misskeyApiGet('notes/featured').then(_notes => {
 	notes.value = _notes;
 });
 
+function changeScrollState() {
+	if (scrollState.value !== 'loop') {
+		scrollState.value = 'loop';
+	}
+}
+
 onUpdated(() => {
-	if (!scrollEl.value) return;
-	const container = getScrollContainer(scrollEl.value);
+	if (!notesMainContainerEl.value) return;
+	const container = getScrollContainer(notesMainContainerEl.value);
 	const containerHeight = container ? container.clientHeight : window.innerHeight;
-	if (scrollEl.value.offsetHeight > containerHeight) {
+	if (notesMainContainerEl.value.offsetHeight > containerHeight) {
+		if (scrollState.value === null) {
+			scrollState.value = 'intro';
+		}
 		isScrolling.value = true;
 	}
 });
 </script>
 
 <style lang="scss" module>
-@keyframes scroll {
+@keyframes scrollIntro {
 	0% {
 		transform: translate3d(0, 0, 0);
 	}
-	5% {
-		transform: translate3d(0, 0, 0);
+	100% {
+		transform: translate3d(0, calc(calc(-100% - 128px) - var(--margin)), 0);
 	}
-	75% {
-		transform: translate3d(0, calc(-100% + 90vh), 0);
+}
+
+@keyframes scrollConstant {
+	0% {
+		transform: translate3d(0, -128px, 0);
 	}
-	90% {
-		transform: translate3d(0, calc(-100% + 90vh), 0);
+	100% {
+		transform: translate3d(0, calc(calc(-100% - 128px) - var(--margin)), 0);
 	}
 }
 
@@ -73,24 +77,26 @@ onUpdated(() => {
 	text-align: right;
 }
 
-.scrollbox {
-	&.scroll {
-		animation: scroll 45s linear infinite;
+.scrollBoxMain {
+	&.scrollIntro {
+		animation: scrollIntro 30s linear forwards;
+	}
+	&.scrollLoop {
+		animation: scrollConstant 30s linear infinite;
 	}
 }
 
-.note {
-	margin: 16px 0 16px auto;
-}
-
-.content {
-	padding: 16px;
-	margin: 0 0 0 auto;
-	max-width: max-content;
-	border-radius: 16px;
+.scrollBoxSub {
+	&.scrollIntro {
+		animation: scrollIntro 30s linear forwards;
+	}
+	&.scrollLoop {
+		animation: scrollConstant 30s linear infinite;
+	}
 }
 
-.richcontent {
-	min-width: 250px;
+.root:has(.note:hover) .scrollBoxMain,
+.root:has(.note:hover) .scrollBoxSub {
+	animation-play-state: paused;
 }
 </style>