From ade603ff7a6e2985a236949ed3d737ddab095aa1 Mon Sep 17 00:00:00 2001
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 <67428053+kakkokari-gtyih@users.noreply.github.com>
Date: Fri, 22 Aug 2025 19:34:20 +0900
Subject: [PATCH] =?UTF-8?q?fix(frontend):=20=E3=83=9A=E3=83=BC=E3=82=B8?=
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* fix(frontend): ページネーションの進行方向を指定できるように

* Update Changelog

* fix lint

* fix: directionをMkPaginationに移動

* fix

* fix

* fix

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>
---
 CHANGELOG.md                                  |  1 +
 .../src/components/MkNotesTimeline.vue        |  5 +-
 .../frontend/src/components/MkPagination.vue  | 51 ++++++++++++++++---
 packages/frontend/src/pages/note.vue          |  4 +-
 packages/frontend/src/utility/paginator.ts    | 44 ++++++++++++----
 5 files changed, 86 insertions(+), 19 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59c3e7481b..c6d674b4f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -53,6 +53,7 @@
 - Fix: カラムの名前が正しくリスト/チャンネルの名前にならない問題を修正
 - Fix: 複数のメンションを1行に記述した場合に、サジェストが正しく表示されない問題を修正
 - Fix: メンションとしての条件を満たしていても、特定の条件(`-`が含まれる場合など)で正しくサジェストされない問題を一部修正
+- Fix: ユーザーの前後ノートを閲覧する機能が壊れている問題を修正
 
 ### Server
 - Feat: サーバー管理コマンド
diff --git a/packages/frontend/src/components/MkNotesTimeline.vue b/packages/frontend/src/components/MkNotesTimeline.vue
index 42d44dffdb..d94cf3924c 100644
--- a/packages/frontend/src/components/MkNotesTimeline.vue
+++ b/packages/frontend/src/components/MkNotesTimeline.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkPagination :paginator="paginator" :autoLoad="autoLoad" :pullToRefresh="pullToRefresh" :withControl="withControl">
+<MkPagination :paginator="paginator" :direction="direction" :autoLoad="autoLoad" :pullToRefresh="pullToRefresh" :withControl="withControl">
 	<template #empty><MkResult type="empty" :text="i18n.ts.noNotes"/></template>
 
 	<template #default="{ items: notes }">
@@ -50,11 +50,14 @@ import { isSeparatorNeeded, getSeparatorInfo } from '@/utility/timeline-date-sep
 const props = withDefaults(defineProps<{
 	paginator: T;
 	noGap?: boolean;
+
+	direction?: 'up' | 'down' | 'both';
 	autoLoad?: boolean;
 	pullToRefresh?: boolean;
 	withControl?: boolean;
 }>(), {
 	autoLoad: true,
+	direction: 'down',
 	pullToRefresh: true,
 	withControl: true,
 });
diff --git a/packages/frontend/src/components/MkPagination.vue b/packages/frontend/src/components/MkPagination.vue
index 8ca1c80e84..4ea62f2812 100644
--- a/packages/frontend/src/components/MkPagination.vue
+++ b/packages/frontend/src/components/MkPagination.vue
@@ -25,15 +25,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 
 			<div v-else key="_root_" class="_gaps">
-				<slot :items="unref(paginator.items)" :fetching="paginator.fetching.value || paginator.fetchingOlder.value"></slot>
-				<div v-if="paginator.order.value === 'oldest'">
-					<MkButton v-if="!paginator.fetchingNewer.value" :class="$style.more" :wait="paginator.fetchingNewer.value" primary rounded @click="paginator.fetchNewer()">
+				<div v-if="direction === 'up' || direction === 'both'" v-show="upButtonVisible">
+					<MkButton v-if="!upButtonLoading" :class="$style.more" primary rounded @click="upButtonClick">
 						{{ i18n.ts.loadMore }}
 					</MkButton>
 					<MkLoading v-else/>
 				</div>
-				<div v-else v-show="paginator.canFetchOlder.value">
-					<MkButton v-if="!paginator.fetchingOlder.value" :class="$style.more" :wait="paginator.fetchingOlder.value" primary rounded @click="paginator.fetchOlder()">
+				<slot :items="unref(paginator.items)" :fetching="paginator.fetching.value || paginator.fetchingOlder.value"></slot>
+				<div v-if="direction === 'down' || direction === 'both'" v-show="downButtonVisible">
+					<MkButton v-if="!downButtonLoading" :class="$style.more" primary rounded @click="downButtonClick">
 						{{ i18n.ts.loadMore }}
 					</MkButton>
 					<MkLoading v-else/>
@@ -46,7 +46,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup generic="T extends IPaginator">
 import { isLink } from '@@/js/is-link.js';
-import { onMounted, watch, unref } from 'vue';
+import { onMounted, computed, watch, unref } from 'vue';
 import type { UnwrapRef } from 'vue';
 import type { IPaginator } from '@/utility/paginator.js';
 import MkButton from '@/components/MkButton.vue';
@@ -58,11 +58,20 @@ import * as os from '@/os.js';
 
 const props = withDefaults(defineProps<{
 	paginator: T;
+
+	// ページネーションを進める方向
+	// up: 上方向
+	// down: 下方向 (default)
+	// both: 双方向
+	// NOTE: この方向はページネーションの方向であって、アイテムの並び順ではない
+	direction?: 'up' | 'down' | 'both';
+
 	autoLoad?: boolean;
 	pullToRefresh?: boolean;
 	withControl?: boolean;
 }>(), {
 	autoLoad: true,
+	direction: 'down',
 	pullToRefresh: true,
 	withControl: false,
 });
@@ -93,6 +102,36 @@ if (props.paginator.computedParams) {
 	}, { immediate: false, deep: true });
 }
 
+const upButtonVisible = computed(() => {
+	return props.paginator.order.value === 'oldest' ? props.paginator.canFetchOlder.value : props.paginator.canFetchNewer.value;
+});
+const upButtonLoading = computed(() => {
+	return props.paginator.order.value === 'oldest' ? props.paginator.fetchingOlder.value : props.paginator.fetchingNewer.value;
+});
+
+function upButtonClick() {
+	if (props.paginator.order.value === 'oldest') {
+		props.paginator.fetchOlder();
+	} else {
+		props.paginator.fetchNewer();
+	}
+}
+
+const downButtonVisible = computed(() => {
+	return props.paginator.order.value === 'oldest' ? props.paginator.canFetchNewer.value : props.paginator.canFetchOlder.value;
+});
+const downButtonLoading = computed(() => {
+	return props.paginator.order.value === 'oldest' ? props.paginator.fetchingNewer.value : props.paginator.fetchingOlder.value;
+});
+
+function downButtonClick() {
+	if (props.paginator.order.value === 'oldest') {
+		props.paginator.fetchNewer();
+	} else {
+		props.paginator.fetchOlder();
+	}
+}
+
 defineSlots<{
 	empty: () => void;
 	default: (props: { items: UnwrapRef<T['items']> }) => void;
diff --git a/packages/frontend/src/pages/note.vue b/packages/frontend/src/pages/note.vue
index 9de1ef099b..89ae3d2d83 100644
--- a/packages/frontend/src/pages/note.vue
+++ b/packages/frontend/src/pages/note.vue
@@ -9,7 +9,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<Transition :name="prefer.s.animation ? 'fade' : ''" mode="out-in">
 			<div v-if="note">
 				<div v-if="showNext" class="_margin">
-					<MkNotesTimeline :withControl="false" :pullToRefresh="false" class="" :paginator="showNext === 'channel' ? nextChannelPaginator : nextUserPaginator" :noGap="true"/>
+					<MkNotesTimeline direction="up" :withControl="false" :pullToRefresh="false" class="" :paginator="showNext === 'channel' ? nextChannelPaginator : nextUserPaginator" :noGap="true"/>
 				</div>
 
 				<div class="_margin">
@@ -81,7 +81,6 @@ const error = ref();
 const prevUserPaginator = markRaw(new Paginator('users/notes', {
 	limit: 10,
 	initialId: props.noteId,
-	initialDirection: 'older',
 	computedParams: computed(() => note.value ? ({
 		userId: note.value.userId,
 	}) : undefined),
@@ -99,7 +98,6 @@ const nextUserPaginator = markRaw(new Paginator('users/notes', {
 const prevChannelPaginator = markRaw(new Paginator('channels/timeline', {
 	limit: 10,
 	initialId: props.noteId,
-	initialDirection: 'older',
 	computedParams: computed(() => note.value && note.value.channelId != null ? ({
 		channelId: note.value.channelId,
 	}) : undefined),
diff --git a/packages/frontend/src/utility/paginator.ts b/packages/frontend/src/utility/paginator.ts
index 63525b311a..7db55db7d6 100644
--- a/packages/frontend/src/utility/paginator.ts
+++ b/packages/frontend/src/utility/paginator.ts
@@ -37,6 +37,7 @@ export interface IPaginator<T = unknown, _T = T & MisskeyEntity> {
 	fetchingOlder: Ref<boolean>;
 	fetchingNewer: Ref<boolean>;
 	canFetchOlder: Ref<boolean>;
+	canFetchNewer: Ref<boolean>;
 	canSearch: boolean;
 	error: Ref<boolean>;
 	computedParams: ComputedRef<Misskey.Endpoints[PaginatorCompatibleEndpointPaths]['req'] | null | undefined> | null;
@@ -77,6 +78,7 @@ export class Paginator<
 	public fetchingOlder = ref(false);
 	public fetchingNewer = ref(false);
 	public canFetchOlder = ref(false);
+	public canFetchNewer = ref(false);
 	public canSearch = false;
 	public error = ref(false);
 	private endpoint: Endpoint;
@@ -85,7 +87,12 @@ export class Paginator<
 	public computedParams: ComputedRef<E['req'] | null | undefined> | null;
 	public initialId: MisskeyEntity['id'] | null = null;
 	public initialDate: number | null = null;
+
+	// 初回読み込み時、initialIdを基準にそれより新しいものを取得するか古いものを取得するか
+	// newer: initialIdより新しいものを取得する
+	// older: initialIdより古いものを取得する (default)
 	public initialDirection: 'newer' | 'older';
+
 	private offsetMode: boolean;
 	public noPaging: boolean;
 	public searchQuery = ref<null | string>('');
@@ -116,6 +123,7 @@ export class Paginator<
 		initialId?: MisskeyEntity['id'];
 		initialDate?: number | null;
 		initialDirection?: 'newer' | 'older';
+
 		order?: 'newest' | 'oldest';
 
 		// 一部のAPIはさらに遡れる場合でもパフォーマンス上の理由でlimit以下の結果を返す場合があり、その場合はsafe、それ以外はlimitにすることを推奨
@@ -222,15 +230,15 @@ export class Paginator<
 
 		if (this.canFetchDetection === 'limit') {
 			if (apiRes.length < FIRST_FETCH_LIMIT) {
-				this.canFetchOlder.value = false;
+				(this.initialDirection === 'older' ? this.canFetchOlder : this.canFetchNewer).value = false;
 			} else {
-				this.canFetchOlder.value = true;
+				(this.initialDirection === 'older' ? this.canFetchOlder : this.canFetchNewer).value = true;
 			}
 		} else if (this.canFetchDetection === 'safe' || this.canFetchDetection == null) {
 			if (apiRes.length === 0 || this.noPaging) {
-				this.canFetchOlder.value = false;
+				(this.initialDirection === 'older' ? this.canFetchOlder : this.canFetchNewer).value = false;
 			} else {
-				this.canFetchOlder.value = true;
+				(this.initialDirection === 'older' ? this.canFetchOlder : this.canFetchNewer).value = true;
 			}
 		}
 
@@ -273,7 +281,11 @@ export class Paginator<
 			if (i === 10) item._shouldInsertAd_ = true;
 		}
 
-		this.pushItems(apiRes);
+		if (this.order.value === 'oldest') {
+			this.unshiftItems(apiRes.toReversed(), false);
+		} else {
+			this.pushItems(apiRes);
+		}
 
 		if (this.canFetchDetection === 'limit') {
 			if (apiRes.length < FIRST_FETCH_LIMIT) {
@@ -313,7 +325,11 @@ export class Paginator<
 
 		this.fetchingNewer.value = false;
 
-		if (apiRes == null || apiRes.length === 0) return; // これやらないと余計なre-renderが走る
+		if (apiRes == null || apiRes.length === 0) {
+			this.canFetchNewer.value = false;
+			// 余計なre-renderを防止するためここで終了
+			return;
+		}
 
 		if (options.toQueue) {
 			this.aheadQueue.unshift(...apiRes.toReversed());
@@ -325,9 +341,19 @@ export class Paginator<
 			if (this.order.value === 'oldest') {
 				this.pushItems(apiRes);
 			} else {
-				this.unshiftItems(apiRes.toReversed());
+				this.unshiftItems(apiRes.toReversed(), false);
 			}
 		}
+
+		if (this.canFetchDetection === 'limit') {
+			if (apiRes.length < FIRST_FETCH_LIMIT) {
+				this.canFetchNewer.value = false;
+			} else {
+				this.canFetchNewer.value = true;
+			}
+		}
+		// canFetchDetectionが'safe'の場合・apiRes.length === 0 の場合は apiRes.length === 0 の場合に canFetchNewer.value = false になるが、
+		// 余計な re-render を防ぐために上部で処理している。そのため、ここでは何もしない
 	}
 
 	public trim(trigger = true): void {
@@ -336,10 +362,10 @@ export class Paginator<
 		if (this.useShallowRef && trigger) triggerRef(this.items);
 	}
 
-	public unshiftItems(newItems: T[]): void {
+	public unshiftItems(newItems: T[], trim = true): void {
 		if (newItems.length === 0) return; // これやらないと余計なre-renderが走る
 		this.items.value.unshift(...newItems.filter(x => !this.items.value.some(y => y.id === x.id))); // ストリーミングやポーリングのタイミングによっては重複することがあるため
-		this.trim(false);
+		if (trim) this.trim(true);
 		if (this.useShallowRef) triggerRef(this.items);
 	}