fix(frontend): ダイアログのお知らせが画面からはみ出ることがある問題を修正 (#15878)

* fix(frontend): ダイアログのお知らせが画面からはみ出ることがある問題を修正

* Update Changelog

* :art:

* :art:

* enhance: スクロールしないと閉じられないように

* Update CHANGELOG.md

1 files changed, 55 insertions, 7 deletions

diff --git a/packages/frontend/src/components/MkAnnouncementDialog.vue b/packages/frontend/src/components/MkAnnouncementDialog.vue
index 6e5b29654b..81c92bfb5c 100644
--- a/packages/frontend/src/components/MkAnnouncementDialog.vue
+++ b/packages/frontend/src/components/MkAnnouncementDialog.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkModal ref="modal" :zPriority="'middle'" @closed="$emit('closed')" @click="onBgClick">
+<MkModal ref="modal" :zPriority="'middle'" :preferType="'dialog'" @closed="$emit('closed')" @click="onBgClick">
 	<div ref="rootEl" :class="$style.root">
 		<div :class="$style.header">
 			<span :class="$style.icon">
@@ -16,13 +16,21 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<span :class="$style.title">{{ announcement.title }}</span>
 		</div>
 		<div :class="$style.text"><Mfm :text="announcement.text"/></div>
-		<MkButton primary full @click="ok">{{ i18n.ts.ok }}</MkButton>
+		<div ref="bottomEl"></div>
+		<div :class="$style.footer">
+			<MkButton
+				primary
+				full
+				:disabled="!hasReachedBottom"
+				@click="ok"
+			>{{ hasReachedBottom ? i18n.ts.close : i18n.ts.scrollToClose }}</MkButton>
+		</div>
 	</div>
 </MkModal>
 </template>
 
 <script lang="ts" setup>
-import { onMounted, useTemplateRef } from 'vue';
+import { onMounted, ref, useTemplateRef } from 'vue';
 import * as Misskey from 'misskey-js';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
@@ -32,12 +40,12 @@ import { i18n } from '@/i18n.js';
 import { $i } from '@/i.js';
 import { updateCurrentAccountPartial } from '@/accounts.js';
 
-const props = withDefaults(defineProps<{
+const props = defineProps<{
 	announcement: Misskey.entities.Announcement;
-}>(), {
-});
+}>();
 
 const rootEl = useTemplateRef('rootEl');
+const bottomEl = useTemplateRef('bottomEl');
 const modal = useTemplateRef('modal');
 
 async function ok() {
@@ -72,7 +80,34 @@ function onBgClick() {
 	});
 }
 
+const hasReachedBottom = ref(false);
+
 onMounted(() => {
+	if (bottomEl.value && rootEl.value) {
+		const bottomElRect = bottomEl.value.getBoundingClientRect();
+		const rootElRect = rootEl.value.getBoundingClientRect();
+		if (
+			bottomElRect.top >= rootElRect.top &&
+			bottomElRect.top <= (rootElRect.bottom - 66) // 66 ≒ 75 * 0.9 (modalのアニメーション分)
+		) {
+			hasReachedBottom.value = true;
+			return;
+		}
+
+		const observer = new IntersectionObserver(entries => {
+			for (const entry of entries) {
+				if (entry.isIntersecting) {
+					hasReachedBottom.value = true;
+					observer.disconnect();
+				}
+			}
+		}, {
+			root: rootEl.value,
+			rootMargin: '0px 0px -75px 0px',
+		});
+
+		observer.observe(bottomEl.value);
+	}
 });
 </script>
 
@@ -80,9 +115,12 @@ onMounted(() => {
 .root {
 	margin: auto;
 	position: relative;
-	padding: 32px;
+	padding: 32px 32px 0;
 	min-width: 320px;
 	max-width: 480px;
+	max-height: 100%;
+	overflow-y: auto;
+	overflow-x: hidden;
 	box-sizing: border-box;
 	background: var(--MI_THEME-panel);
 	border-radius: var(--MI-radius);
@@ -103,4 +141,14 @@ onMounted(() => {
 .text {
 	margin: 1em 0;
 }
+
+.footer {
+	position: sticky;
+	bottom: 0;
+	left: -32px;
+	backdrop-filter: var(--MI-blur, blur(15px));
+	background: color(from var(--MI_THEME-bg) srgb r g b / 0.5);
+	margin: 0 -32px;
+	padding: 24px 32px;
+}
 </style>