timelineBackTopBehavior

locales/index.d.ts

@@ -1097,6 +1097,7 @@ export interface Locale {
     "doYouAgree": string;
     "beSureToReadThisAsItIsImportant": string;
     "iHaveReadXCarefullyAndAgree": string;
+    "timelineBackTopBehavior": string;
     "_initialAccountSetting": {
         "accountCreated": string;
         "letsStartAccountSetup": string;
@@ -1637,6 +1638,10 @@ export interface Locale {
         "dialog": string;
         "quiet": string;
     };
+    "_timelineBackTopBehavior": {
+        "newest": string;
+        "next": string;
+    };
     "_channel": {
         "create": string;
         "edit": string;

locales/ja-JP.yml

@@ -1094,6 +1094,7 @@ expired: "期限切れ"
 doYouAgree: "同意しますか？"
 beSureToReadThisAsItIsImportant: "重要ですので必ずお読みください。"
 iHaveReadXCarefullyAndAgree: "「{x}」の内容をよく読み、同意します。"
+timelineBackTopBehavior: "タイムラインのスクロールが先頭に戻った時の挙動"
 
 _initialAccountSetting:
   accountCreated: "アカウントの作成が完了しました！"
@@ -1555,6 +1556,10 @@ _serverDisconnectedBehavior:
   dialog: "ダイアログで警告"
   quiet: "控えめに警告"
 
+_timelineBackTopBehavior:
+  newest: "最新の投稿を表示"
+  next: "次の投稿を遡る"
+
 _channel:
   create: "チャンネルを作成"
   edit: "チャンネルを編集"

packages/frontend/src/components/MkPagination.vue

@@ -47,7 +47,7 @@ import MkButton from '@/components/MkButton.vue';
 import { defaultStore } from '@/store';
 import { MisskeyEntity } from '@/types/date-separated-list';
 import { i18n } from '@/i18n';
-import { UAParser } from 'ua-parser-js';
+import { isWebKit } from '@/scripts/useragent';
 
 const SECOND_FETCH_LIMIT = 30;
 const TOLERANCE = 6;
@@ -94,8 +94,7 @@ function concatMapWithArray(map: MisskeyEntityMap, entities: MisskeyEntity[]): M
 	return new Map([...map, ...arrayToEntries(entities)]);
 }
 
-const ua = new UAParser(navigator.userAgent);
-const isWebKit = ua.getEngine().name === 'WebKit';
+const timelineBackTopBehavior = computed(() => isWebKit() ? 'newest' : defaultStore.reactiveState.timelineBackTopBehavior.value);
 </script>
 <script lang="ts" setup>
 import { infoImageUrl } from '@/instance';
@@ -200,7 +199,7 @@ watch([$$(rootEl), $$(scrollObserver)], () => {
  * weakBackedがtrue→falseになったらexecuteQueue
  */
 watch($$(weakBacked), () => {
-	if (!isWebKit && !weakBacked) {
+	if (timelineBackTopBehavior.value === 'next' && !weakBacked) {
 		executeQueue();
 	}
 });
@@ -499,7 +498,7 @@ const prepend = (item: MisskeyEntity): void => {
 			// かなりスクロールの先頭にいる場合
 			if (items.value.has(item.id)) return; // 既にタイムラインにある場合は何もしない
 			unshiftItems([item]);
-		} else if (!isWebKit && !weakBacked) {
+		} else if (timelineBackTopBehavior.value === 'next' && !weakBacked) {
 			// ちょっと先頭にいる場合はスクロールを調整する
 			prependQueue(item);
 			executeQueue();
@@ -538,7 +537,7 @@ function concatItems(oldItems: MisskeyEntity[]) {
 async function executeQueue() {
 	if (queue.value.size === 0) return;
 	if (isPausingUpdateByExecutingQueue.value) return;
-	if (isWebKit) {
+	if (timelineBackTopBehavior === 'newest') {
 		// Safariは最新のアイテムにするだけ
 		const newItems = Array.from(queue.value.values()).slice(-1 * props.pagination.limit);
 		unshiftItems(newItems);

packages/frontend/src/pages/settings/general.vue

@@ -21,10 +21,18 @@
 	</MkRadios>
 
 	<FormSection>
-		<div class="_gaps_s">
-			<MkSwitch v-model="showFixedPostForm">{{ i18n.ts.showFixedPostForm }}</MkSwitch>
-			<MkSwitch v-model="showFixedPostFormInChannel">{{ i18n.ts.showFixedPostFormInChannel }}</MkSwitch>
-			<MkSwitch v-model="showTimelineReplies">{{ i18n.ts.flagShowTimelineReplies }}<template #caption>{{ i18n.ts.flagShowTimelineRepliesDescription }} {{ i18n.ts.reflectMayTakeTime }}</template></MkSwitch>
+		<div class="_gaps_m">
+			<div class="_gaps_s">
+				<MkSwitch v-model="showFixedPostForm">{{ i18n.ts.showFixedPostForm }}</MkSwitch>
+				<MkSwitch v-model="showFixedPostFormInChannel">{{ i18n.ts.showFixedPostFormInChannel }}</MkSwitch>
+				<MkSwitch v-model="showTimelineReplies">{{ i18n.ts.flagShowTimelineReplies }}<template #caption>{{ i18n.ts.flagShowTimelineRepliesDescription }} {{ i18n.ts.reflectMayTakeTime }}</template></MkSwitch>
+			</div>
+
+			<MkSelect v-model="timelineBackTopBehavior" :disabled="isWebKit()">
+				<template #label>{{ i18n.ts.timelineBackTopBehavior }}</template>
+				<option value="newest">{{ i18n.ts._timelineBackTopBehavior.newest }}</option>
+				<option value="next">{{ i18n.ts._timelineBackTopBehavior.next }}</option>
+			</MkSelect>
 		</div>
 	</FormSection>
 
@@ -180,6 +188,7 @@ import { unisonReload } from '@/scripts/unison-reload';
 import { i18n } from '@/i18n';
 import { definePageMetadata } from '@/scripts/page-metadata';
 import { miLocalStorage } from '@/local-storage';
+import { isWebKit } from '@/scripts/useragent';
 
 const lang = ref(miLocalStorage.getItem('lang'));
 const fontSize = ref(miLocalStorage.getItem('fontSize'));
@@ -226,6 +235,7 @@ const mediaListWithOneImageAppearance = computed(defaultStore.makeGetterSetter('
 const notificationPosition = computed(defaultStore.makeGetterSetter('notificationPosition'));
 const notificationStackAxis = computed(defaultStore.makeGetterSetter('notificationStackAxis'));
 const showTimelineReplies = computed(defaultStore.makeGetterSetter('showTimelineReplies'));
+const timelineBackTopBehavior = computed(defaultStore.makeGetterSetter('timelineBackTopBehavior'));
 
 watch(lang, () => {
 	miLocalStorage.setItem('lang', lang.value as string);

packages/frontend/src/pages/settings/preferences-backups.vue

@@ -87,6 +87,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'numberOfPageCache',
 	'aiChanMode',
 	'mediaListWithOneImageAppearance',
+	'timelineBackTopBehavior',
 ];
 const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
 	'lightTheme',

packages/frontend/src/scripts/useragent.ts

@@ -0,0 +1,3 @@
+import { UAParser } from 'ua-parser-js';
+const ua = new UAParser(navigator.userAgent);
+export const isWebKit = () => ua.getEngine().name === 'WebKit';

packages/frontend/src/store.ts

@@ -1,5 +1,6 @@
 import { markRaw, ref } from 'vue';
 import { Storage } from './pizzax';
+import { isWebKit } from './scripts/useragent';
 
 interface PostFormAction {
 	title: string,
@@ -342,6 +343,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: {} as Record<string, Record<string, string[]>>,
 	},
+	timelineBackTopBehavior: {
+		where: 'device',
+		default: (isWebKit() ? 'newest' : 'next') as 'newest' | 'next',
+	},
 }));
 
 // TODO: 他のタブと永続化されたstateを同期