refactor(frontend): MkMarquee のコードの可読性の向上 (#16017)

* fix(frontend/MkMarquee): Composition API に移行

* move animation to scoped environment

* refactor

---------

Co-authored-by: taiyme <53635909+taiyme@users.noreply.github.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/packages/frontend/src/components/MkMarqueeText.vue b/packages/frontend/src/components/MkMarqueeText.vue
new file mode 100644
index 0000000000..a2c365afe9
--- /dev/null
+++ b/packages/frontend/src/components/MkMarqueeText.vue
@@ -0,0 +1,89 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.wrap">
+	<span
+		ref="contentEl"
+		:class="[$style.content, {
+			[$style.paused]: paused,
+			[$style.reverse]: reverse,
+		}]"
+	>
+		<span v-for="key in repeat" :key="key" :class="$style.text">
+			<slot></slot>
+		</span>
+	</span>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, useTemplateRef, watch } from 'vue';
+
+const props = withDefaults(defineProps<{
+	duration?: number;
+	repeat?: number;
+	paused?: boolean;
+	reverse?: boolean;
+}>(), {
+	duration: 15,
+	repeat: 2,
+	paused: false,
+	reverse: false,
+});
+
+const contentEl = useTemplateRef('contentEl');
+
+function calcDuration() {
+	if (contentEl.value == null) return;
+	const eachLength = contentEl.value.offsetWidth / props.repeat;
+	const factor = 3000;
+	const duration = props.duration / ((1 / eachLength) * factor);
+	contentEl.value.style.animationDuration = `${duration}s`;
+}
+
+watch(() => props.duration, calcDuration);
+
+onMounted(calcDuration);
+</script>
+
+<style lang="scss" module>
+.wrap {
+	overflow: clip;
+	animation-play-state: running;
+
+	&:hover {
+		animation-play-state: paused;
+	}
+}
+
+.content {
+	display: inline-block;
+	white-space: nowrap;
+	animation-play-state: inherit;
+}
+
+.text {
+	display: inline-block;
+	animation-name: marquee;
+	animation-timing-function: linear;
+	animation-iteration-count: infinite;
+	animation-duration: inherit;
+	animation-play-state: inherit;
+}
+
+.paused .text {
+	animation-play-state: paused;
+}
+
+.reverse .text {
+	animation-direction: reverse;
+}
+
+@keyframes marquee {
+	0% { transform: translateX(0); }
+	100% { transform: translateX(-100%); }
+}
+</style>