优化

web/src/components/LibraryTagBar.tsx

@@ -1,12 +1,14 @@
-import { useEffect, useMemo, useRef, useState } from 'react'
-import { Layers, Plus, Settings2, X } from 'lucide-react'
+import { useEffect, useMemo, useRef, useState, type DragEvent } from 'react'
+import { GripVertical, Layers, Plus, Settings2, X } from 'lucide-react'
 
-import { MAX_LIBRARY_TAGS } from '../utils/libraryTags'
+import { ALL_TAG_ID, MAX_LIBRARY_TAGS } from '../utils/libraryTags'
 import type { LibraryTagTab } from '../utils/libraryTags'
 
 /**
  * 媒体库标签栏：固定「全部」+ 每个标签一个页签，选中后只展示该标签下的媒体库。
  * 只是管理员/普通用户都能用的展示层过滤，不改动媒体库本身。
+ * 传入 onReorder 时标签页签可拖拽排序：拖拽只作用于「全部」之后的标签，
+ * 「全部」永远固定在第一位，不参与拖动。
  */
 export function LibraryTagBar({
   tabs,
@@ -14,6 +16,7 @@ export function LibraryTagBar({
   onSelect,
   onCreate,
   onManage,
+  onReorder,
   manageLabel = '管理标签',
   showCreate = true,
   busy = false,
@@ -23,6 +26,8 @@ export function LibraryTagBar({
   onSelect: (tagId: string) => void
   onCreate?: (name: string) => void
   onManage?: () => void
+  /** 拖拽排序的落点：收到的是拖拽后的标签名顺序（不含「全部」）。 */
+  onReorder?: (orderedNames: string[]) => void | Promise<void>
   manageLabel?: string
   showCreate?: boolean
   busy?: boolean
@@ -32,6 +37,8 @@ export function LibraryTagBar({
   const inputRef = useRef<HTMLInputElement | null>(null)
   // 同一帧内 blur 与 Enter 都可能触发提交：用一个标记保证只提交一次。
   const submittedRef = useRef(false)
+  const [draggingId, setDraggingId] = useState<string | null>(null)
+  const [dragOverId, setDragOverId] = useState<string | null>(null)
 
   useEffect(() => {
     if (creating) {
@@ -42,6 +49,25 @@ export function LibraryTagBar({
 
   const hasTags = useMemo(() => tabs.some((tab) => !tab.isAll), [tabs])
 
+  /** 拖拽结束后计算落点顺序并回调。 */
+  const handleDrop = (e: DragEvent, overTabId: string) => {
+    e.preventDefault()
+    const fromId = draggingId ?? e.dataTransfer.getData('text/plain')
+    setDraggingId(null)
+    setDragOverId(null)
+    if (!onReorder || !fromId || fromId === ALL_TAG_ID || fromId === overTabId) return
+    const names = tabs
+      .filter((tab) => !tab.isAll)
+      .map((tab) => tab.id)
+    const fromIndex = names.indexOf(fromId)
+    const overIndex = names.indexOf(overTabId)
+    if (fromIndex < 0 || overIndex < 0) return
+    const next = [...names]
+    const [moved] = next.splice(fromIndex, 1)
+    next.splice(overIndex, 0, moved)
+    void onReorder(next)
+  }
+
   const submit = () => {
     if (submittedRef.current) return
     submittedRef.current = true
@@ -63,24 +89,64 @@ export function LibraryTagBar({
       <div className="flex flex-wrap items-center gap-1.5">
         {tabs.map((tab) => {
           const active = tab.id === selectedTagId
+          const draggable = !tab.isAll && Boolean(onReorder)
           return (
             <button
               key={tab.id}
               type="button"
               onClick={() => onSelect(tab.id)}
               aria-pressed={active}
-              className={`inline-flex items-center gap-1.5 rounded-xl border px-3 py-1.5 text-xs font-bold transition-colors ${
-                active
-                  ? 'border-brand-500/60 bg-brand-500/10 text-brand-600'
-                  : 'border-[var(--app-border)] bg-[var(--app-panel-soft)] text-[var(--app-subtle)] hover:border-brand-500/40 hover:text-[var(--app-text)]'
+              draggable={draggable}
+              onDragStart={(e) => {
+                if (!draggable) return
+                e.dataTransfer.effectAllowed = 'move'
+                e.dataTransfer.setData('text/plain', tab.id)
+                setDraggingId(tab.id)
+                setDragOverId(null)
+              }}
+              onDragOver={(e) => {
+                if (draggingId === tab.id || tab.isAll) return
+                e.preventDefault()
+                e.dataTransfer.dropEffect = 'move'
+                if (dragOverId !== tab.id) setDragOverId(tab.id)
+              }}
+              onDragLeave={() => {
+                setDragOverId((prev) => (prev === tab.id ? null : prev))
+              }}
+              onDrop={(e) => handleDrop(e, tab.id)}
+              onDragEnd={() => {
+                setDraggingId(null)
+                setDragOverId(null)
+              }}
+              className={`group inline-flex cursor-default items-center gap-1.5 rounded-xl border px-3 py-1.5 text-xs font-bold transition-colors ${
+                draggingId === tab.id
+                  ? 'opacity-40'
+                  : dragOverId === tab.id
+                    ? 'border-brand-500 bg-brand-500/10 text-brand-600'
+                    : active
+                      ? 'border-brand-500/60 bg-brand-500/10 text-brand-600'
+                      : 'border-[var(--app-border)] bg-[var(--app-panel-soft)] text-[var(--app-subtle)] hover:border-brand-500/40 hover:text-[var(--app-text)]'
               }`}
-              title={tab.isAll ? '显示全部媒体库' : `只看「${tab.name}」标签下的媒体库`}
+              title={
+                tab.isAll
+                  ? '显示全部媒体库'
+                  : draggable
+                    ? `只看「${tab.name}」标签下的媒体库（拖拽可调整顺序）`
+                    : `只看「${tab.name}」标签下的媒体库`
+              }
             >
               {tab.isAll && <Layers size={13} />}
               <span className="max-w-[8rem] truncate">{tab.name}</span>
               <span className={`font-mono text-[10px] ${active ? 'text-brand-500' : 'text-[var(--app-muted)]'}`}>
                 {tab.count}
               </span>
+              {draggable && (
+                <GripVertical
+                  size={12}
+                  className="shrink-0 cursor-grab text-[var(--app-muted)] opacity-0 transition-opacity group-hover:opacity-100 active:cursor-grabbing"
+                  aria-hidden
+                />
+              )}
             </button>
           )
         })}

web/src/hooks/useLibraryTags.ts

@@ -11,6 +11,7 @@ import {
   normalizeTagName,
   readCachedLibraryTags,
   readSelectedTagId,
+  reorderLibraryTags,
   resolveSelectedTagId,
   saveLibraryTags,
   writeCachedLibraryTags,
@@ -32,6 +33,8 @@ export type UseLibraryTagsResult = {
   setSelectedTagId: (tagId: string) => void
   createTag: (name: string) => Promise<string>
   renameTag: (from: string, to: string) => Promise<void>
+  /** 按给定标签名顺序重排标签栏（拖拽排序的落点）。 */
+  reorderTags: (orderedNames: string[]) => Promise<void>
   removeTag: (name: string) => Promise<void>
   /** 覆盖某个标签下的媒体库集合（保持传入顺序）。 */
   setTagLibraries: (name: string, libraryIds: string[]) => Promise<void>
@@ -103,13 +106,16 @@ export function useLibraryTags(): UseLibraryTagsResult {
   }, [])
 
   // 选中的标签可能被删除，落回「全部」以免标签栏空白。
+  // 注意：标签首次加载完成前 tags 为空集合，此时不能据此判定标签已被删除，
+  // 否则从子页面返回时，持久化的选中标签会被误重置为「全部」。
   useEffect(() => {
+    if (loading) return
     const resolved = resolveSelectedTagId(tags, selectedTagId)
     if (resolved !== selectedTagId) {
       selectedRef.current = resolved
       setSelectedTagIdState(resolved)
     }
-  }, [tags, selectedTagId])
+  }, [loading, tags, selectedTagId])
 
   const setSelectedTagId = useCallback((tagId: string) => {
     const next = tagId && tagId !== ALL_TAG_ID ? tagId : ALL_TAG_ID
@@ -193,6 +199,13 @@ export function useLibraryTags(): UseLibraryTagsResult {
     [mutate, setSelectedTagId],
   )
 
+  const reorderTags = useCallback(
+    async (orderedNames: string[]) => {
+      await mutate((current) => reorderLibraryTags(current, orderedNames))
+    },
+    [mutate],
+  )
+
   const removeTag = useCallback(
     async (name: string) => {
       await mutate((current) => current.filter((tag) => tag.name !== name))
@@ -239,6 +252,7 @@ export function useLibraryTags(): UseLibraryTagsResult {
     setSelectedTagId,
     createTag,
     renameTag,
+    reorderTags,
     removeTag,
     setTagLibraries,
     assignLibrary,

web/src/pages/HomePage.tsx

@@ -340,6 +340,9 @@ export function HomePage() {
             onCreate={(name) => {
               void libraryTags.createTag(name)
             }}
+            onReorder={(names) => {
+              void libraryTags.reorderTags(names)
+            }}
             onManage={() => setLibraryTagsOpen(true)}
             busy={libraryTags.saving}
           />

web/src/pages/LibrariesPage.tsx

@@ -31,11 +31,13 @@ import { partitionPreviewIDs } from '../utils/remoteEmby'
 
 export function LibrariesPage() {
   const isAdmin = useAuthStore((state) => state.user?.role === 'admin')
-  const [libraries, setLibraries] = useState<Library[]>([])
+  // 会话缓存命中时首屏即用缓存渲染（避免先闪一帧占位再被撑高），
+  // 这样 useScrollMemory 的布局期恢复才能在返回列表时立刻落到原位置。
+  const [libraries, setLibraries] = useState<Library[]>(() => peekLibraries() ?? [])
   const [libraryData, setLibraryData] = useState<Record<string, { cards: SeriesCard[]; total: number }>>({})
-  const { pinnedIds, loading: pinnedLoading, togglePin } = usePinnedLibraries()
+  const { pinnedIds, togglePin } = usePinnedLibraries()
   const libraryTags = useLibraryTags()
-  const [loading, setLoading] = useState(true)
+  const [loading, setLoading] = useState(() => peekLibraries() === null)
   const [repairing, setRepairing] = useState(false)
   const [repairEpisodeArtwork, setRepairEpisodeArtwork] = useEpisodeArtworkPreference()
   const [repairMsg, setRepairMsg] = useState('')
@@ -184,7 +186,7 @@ export function LibrariesPage() {
     [taggedPreviews],
   )
 
-  if (loading || pinnedLoading) {
+  if (loading) {
     return <p className="px-2 py-8 text-sm text-sand-500">媒体库加载中…</p>
   }
 
@@ -212,6 +214,9 @@ export function LibrariesPage() {
         onCreate={(name) => {
           void libraryTags.createTag(name)
         }}
+        onReorder={(names) => {
+          void libraryTags.reorderTags(names)
+        }}
         onManage={() => setLibraryTagsOpen(true)}
         busy={libraryTags.saving}
       />
@@ -248,19 +253,17 @@ export function LibrariesPage() {
   )
 }
 
-/** 按选中标签过滤媒体库预览（ALL_TAG_ID 时原样返回，保留置顶/列表排序）。 */
+/**
+ * 按选中标签过滤媒体库预览：复用共享的成员筛选（保持输入顺序），
+ * 这样排序下拉（含倒序）在标签页与「全部」页行为一致。
+ */
 function filterPreviewsByTag(previews: LibraryPreview[], tags: LibraryTag[], tagId: string): LibraryPreview[] {
   if (!tagId || tagId === ALL_TAG_ID) return previews
-  const ordered = filterLibrariesByTag(
-    previews.map((preview) => ({ id: preview.library.id })),
-    tags,
-    tagId,
-  )
   const byId = new Map(previews.map((preview) => [preview.library.id, preview]))
-  const out: LibraryPreview[] = []
-  for (const item of ordered) {
-    const preview = byId.get(item.id)
-    if (preview) out.push(preview)
+  const kept: LibraryPreview[] = []
+  for (const library of filterLibrariesByTag(previews.map((preview) => preview.library), tags, tagId)) {
+    const preview = byId.get(library.id)
+    if (preview) kept.push(preview)
   }
-  return out
+  return kept
 }

web/src/utils/libraryTags.test.ts

@@ -11,6 +11,7 @@ import {
   filterLibrariesForTagging,
   normalizeLibraryTags,
   normalizeTagName,
+  reorderLibraryTags,
   resolveSelectedTagId,
   tagNameError,
 } from './libraryTags.ts'
@@ -49,10 +50,10 @@ check('tag tab keeps creation order', tabs[1].name === '动画' && tabs[2].name
 check('tag count ignores unavailable libraries', tabs[1].count === 1)
 
 check(
-  'filtering keeps tag order and drops unknown ids',
+  'filtering drops unknown ids and keeps input order',
   filterLibrariesByTag(libs, [{ name: '动画', library_ids: ['lib-c', 'missing', 'lib-a'] }], '动画')
     .map((lib) => lib.id)
-    .join(',') === 'lib-c,lib-a',
+    .join(',') === 'lib-a,lib-c',
 )
 check('全部 returns every library in original order', filterLibrariesByTag(libs, [], ALL_TAG_ID).length === 3)
 check('unknown tag yields no libraries', filterLibrariesByTag(libs, [], 'nope').length === 0)
@@ -135,4 +136,31 @@ check(
   tagNameError('动画', [{ name: '动画', library_ids: [] }], '动画') === '',
 )
 
+const reorderable = [
+  { name: '动画', library_ids: [] },
+  { name: '电影', library_ids: [] },
+  { name: '音乐', library_ids: [] },
+]
+check(
+  'reorder moves a tag to the requested slot',
+  reorderLibraryTags(reorderable, ['电影', '动画', '音乐']).map((tag) => tag.name).join(',') === '电影,动画,音乐',
+)
+check(
+  'reorder can move a tag to the front',
+  reorderLibraryTags(reorderable, ['音乐', '动画', '电影']).map((tag) => tag.name).join(',') === '音乐,动画,电影',
+)
+check(
+  'names missing from the order keep relative order at the end',
+  reorderLibraryTags(reorderable, ['电影']).map((tag) => tag.name).join(',') === '电影,动画,音乐',
+)
+check(
+  'empty order leaves tags untouched',
+  reorderLibraryTags(reorderable, []).map((tag) => tag.name).join(',') === '动画,电影,音乐',
+)
+check('reorder ignores extra unknown names', reorderLibraryTags(reorderable, ['不存在', '音乐']).map((tag) => tag.name).join(',') === '音乐,动画,电影')
+check(
+  'reordering with fewer than two tags is a no-op',
+  reorderLibraryTags([{ name: '动画', library_ids: [] }], []).map((tag) => tag.name).join(',') === '动画',
+)
+
 console.log('libraryTags.test.ts ok')

web/src/utils/libraryTags.ts

@@ -164,8 +164,9 @@ export function isLibraryInTag(tags: LibraryTag[], tagId: string, libraryId: str
 }
 
 /**
- * 按标签过滤媒体库：`tagId` 为「全部」时原样返回（保持原有置顶/手动排序），
- * 否则只保留该标签下的库，并保持标签里记录的顺序。
+ * 按标签过滤媒体库：`tagId` 为「全部」时原样返回。
+ * 只做成员筛选、保持输入顺序，展示顺序（置顶、排序下拉等）由调用方决定；
+ * 标签里记录的 library_ids 顺序只表示归属，不作为展示排序。
  */
 export function filterLibrariesByTag<T extends { id: string }>(
   libraries: T[],
@@ -173,15 +174,9 @@ export function filterLibrariesByTag<T extends { id: string }>(
   tagId: string,
 ): T[] {
   if (!tagId || tagId === ALL_TAG_ID) return libraries
-  const ids = tagLibraryIds(tags, tagId)
-  if (ids.length === 0) return []
-  const byId = new Map(libraries.map((lib) => [lib.id, lib]))
-  const out: T[] = []
-  for (const id of ids) {
-    const lib = byId.get(id)
-    if (lib) out.push(lib)
-  }
-  return out
+  const ids = new Set(tagLibraryIds(tags, tagId))
+  if (ids.size === 0) return []
+  return libraries.filter((lib) => ids.has(lib.id))
 }
 
 /** 生成标签栏模型：首项固定为「全部」，其后按标签顺序追加。 */
@@ -202,6 +197,22 @@ export function buildLibraryTagTabs(libraries: Library[], tags: LibraryTag[]): L
   return tabs
 }
 
+/**
+ * 按给定标签名顺序重排标签栏：`orderedNames` 是期望的标签名顺序（通常来自拖拽后的顺序）。
+ * 未出现在顺序里的标签（例如新建、旧数据并发写入）保持原相对顺序，追加到末尾，绝不丢失。
+ */
+export function reorderLibraryTags(tags: LibraryTag[], orderedNames: string[]): LibraryTag[] {
+  if (tags.length < 2) return tags
+  const rank = new Map(orderedNames.map((name, index) => [name, index]))
+  const ranked: LibraryTag[] = []
+  const rest: LibraryTag[] = []
+  for (const tag of tags) {
+    ;(rank.has(tag.name) ? ranked : rest).push(tag)
+  }
+  ranked.sort((a, b) => (rank.get(a.name) ?? 0) - (rank.get(b.name) ?? 0))
+  return [...ranked, ...rest]
+}
+
 /** 选中的标签是否仍存在；被删除或被过滤掉时回落到「全部」。 */
 export function resolveSelectedTagId(tags: LibraryTag[], selectedId: string): string {
   if (!selectedId || selectedId === ALL_TAG_ID) return ALL_TAG_ID