feat(frontend): EPUB typography themes + chrome migration (B3)

frontend/src/components/reader-settings.tsx

@@ -6,8 +6,8 @@ import { useGlobalDark } from "@/components/theme";
 import { RD_THEMES, RD_THEME_LABEL, FONT_SIZES, resolveRdTheme, useReaderPrefs, type RdTheme } from "@/lib/readerPrefs";
 
 export interface ReaderSettingsProps {
-  /** 进度滑条：value/max 页或千分比由调用方定，onChange 收整数 */
-  slider: { value: number; max: number; onChange: (v: number) => void; ariaLabel: string };
+  /** 进度滑条：value/max 页或千分比由调用方定，onChange 收整数；EPUB 无全局分数故可省 */
+  slider?: { value: number; max: number; onChange: (v: number) => void; ariaLabel: string };
   /** 位置文本，如 "3/12 · 25%" */
   position?: string;
   /** 左半区按钮（导航/上一章/下一章等），调用方给 */
@@ -105,13 +105,15 @@ export function ReaderSettings({ slider, position, left, showFont = false, onFon
           )}
         </div>
       </div>
-      <Slider
-        className="mx-2.5 mt-2 w-[calc(100%-1.25rem)]"
-        value={[slider.value]}
-        max={slider.max}
-        onValueChange={([v]) => slider.onChange(v)}
-        aria-label={slider.ariaLabel}
-      />
+      {slider && (
+        <Slider
+          className="mx-2.5 mt-2 w-[calc(100%-1.25rem)]"
+          value={[slider.value]}
+          max={slider.max}
+          onValueChange={([v]) => slider.onChange(v)}
+          aria-label={slider.ariaLabel}
+        />
+      )}
       {extra && open && <div className="px-2.5 pt-2">{extra}</div>}
     </div>
   );

frontend/src/readers/EpubReader.tsx

@@ -3,8 +3,11 @@ import { useEffect, useRef, useState } from "react";
 import { apiRaw } from "../api/client";
 import { BookmarksTab } from "../components/Bookmarks";
 import { ReaderNav } from "../components/reader-nav";
-import { btn } from "../components/ui";
+import { ReaderSettings, SettingRow } from "../components/reader-settings";
+import { Button } from "@/components/ui/button";
 import { toast } from "../components/Toaster";
+import { useGlobalDark } from "../components/theme";
+import { FONT_SIZES, LINE_HEIGHTS, MARGINS, MARGIN_LABEL, resolveRdTheme, useReaderPrefs } from "../lib/readerPrefs";
 import { useProgressSaver, type ReaderProps } from "../lib/useProgress";
 
 // 仅声明用到的最小子集,避免依赖 epubjs 自带类型的完整性
@@ -16,6 +19,10 @@ interface EpubRendition {
   next(): unknown;
   prev(): unknown;
   on(ev: "relocated", cb: (loc: EpubLocation) => void): void;
+  themes: {
+    register(name: string, rules: Record<string, unknown>): void;
+    select(name: string): void;
+  };
   destroy(): void;
 }
 interface EpubBookLike {
@@ -30,10 +37,20 @@ async function loadEpub(): Promise<(data: Uint8Array) => EpubBookLike> {
   return m.default as (data: Uint8Array) => EpubBookLike;
 }
 
-export default function EpubReader({ book, initialLocator, initialPercent }: ReaderProps) {
+/** epubjs iframe 取不到宿主 CSS 变量 → 三主题 bg/fg 用 index.css 的具体色值常量。 */
+const THEME_CSS = {
+  paper: { bg: "#faf8f4", fg: "#292524" },
+  sepia: { bg: "#f0e6d2", fg: "#433a29" },
+  night: { bg: "#171512", fg: "#c6c0b6" },
+} as const;
+
+export default function EpubReader({ book, initialLocator, initialPercent }: Omit<ReaderProps, "chrome">) {
   const hostRef = useRef<HTMLDivElement>(null);
   const rendRef = useRef<EpubRendition | null>(null);
   const saver = useProgressSaver(book.id, { locator: initialLocator, percent: initialPercent });
+  const pr = useReaderPrefs();
+  const globalDark = useGlobalDark();
+  const rd = resolveRdTheme(pr.prefs.themeMode, globalDark);
   const [nav, setNav] = useState(false);
   const [err, setErr] = useState("");
   const [nonce, setNonce] = useState(0);
@@ -89,42 +106,74 @@ export default function EpubReader({ book, initialLocator, initialPercent }: Rea
     };
   }, [book.file_url, nonce]); // eslint-disable-line react-hooks/exhaustive-deps
 
+  // 排版/主题映射:rd 或 prefs.epub 变化时重新 register+select(iframe 内须用具体色值)
+  useEffect(() => {
+    const r = rendRef.current;
+    if (!r || !ready) return;
+    const { bg, fg } = THEME_CSS[rd];
+    r.themes.register("booklib", {
+      body: {
+        background: bg,
+        color: fg,
+        "line-height": String(LINE_HEIGHTS[pr.prefs.epub.lineIdx]),
+        "font-size": `${FONT_SIZES[pr.prefs.epub.sizeIdx]}px`,
+        padding: `${[0.5, 1, 1.75][pr.prefs.epub.marginIdx]}rem 0`,
+      },
+    });
+    r.themes.select("booklib");
+  }, [rd, pr.prefs.epub, ready]);
+
   if (err)
     return (
-      <div className="grid h-full place-items-center p-8 text-center">
+      <div className="bg-muted grid h-full place-items-center p-8 text-center">
         <div>
-          <p className="mb-3 text-red-400">{err}</p>
-          <button className={btn} onClick={() => setNonce((x) => x + 1)}>
+          <p className="text-destructive mb-3">{err}</p>
+          <Button variant="secondary" onClick={() => setNonce((x) => x + 1)}>
             重试
-          </button>
+          </Button>
         </div>
       </div>
     );
 
   return (
-    <div className="relative grid h-full grid-rows-[1fr_auto]">
-      <div className="relative mx-auto min-h-0 w-full max-w-4xl bg-white shadow-2xl ring-1 ring-stone-800">
-        <div ref={hostRef} className="absolute inset-0" />
+    <div className="relative grid h-full grid-rows-[1fr_auto] bg-background text-foreground" data-rd={rd}>
+      <div className="bg-background ring-border relative mx-auto min-h-0 w-full max-w-4xl shadow-2xl ring-1">
+        <div ref={hostRef} className="absolute inset-0" style={{ background: "var(--rd-bg)" }} />
         {!ready && !err && (
-          <div className="grid h-full place-items-center bg-stone-950 text-stone-500">EPUB 加载中…</div>
+          <div className="bg-muted text-muted-foreground grid h-full place-items-center">EPUB 加载中…</div>
         )}
       </div>
-      <div className="flex items-center justify-center gap-3 border-t border-stone-800 px-4 py-2 text-sm">
-        <button className={btn + " inline-flex items-center gap-0.5"} onClick={() => rendRef.current?.prev()}>
-          <ChevronLeft size={14} /> 上一页
-        </button>
-        <button className={btn + " inline-flex items-center gap-0.5"} onClick={() => rendRef.current?.next()}>
-          下一页 <ChevronRight size={14} />
-        </button>
-        <button
-          className="rd-btn inline-flex items-center gap-1.5"
-          aria-expanded={nav}
-          aria-controls="reader-nav"
-          onClick={() => setNav((v) => !v)}
-        >
-          <PanelLeft size={14} /> 导航
-        </button>
-      </div>
+      <ReaderSettings
+        left={
+          <>
+            <Button variant="ghost" size="sm" className="gap-0.5" onClick={() => rendRef.current?.prev()}>
+              <ChevronLeft size={14} /> 上一页
+            </Button>
+            <Button variant="ghost" size="sm" className="gap-0.5" onClick={() => rendRef.current?.next()}>
+              下一页 <ChevronRight size={14} />
+            </Button>
+            <Button
+              variant="ghost"
+              size="sm"
+              className="gap-1.5"
+              aria-expanded={nav}
+              aria-controls="reader-nav"
+              onClick={() => setNav((v) => !v)}
+            >
+              <PanelLeft size={14} /> 导航
+            </Button>
+          </>
+        }
+        showFont
+        onFont={pr.bumpEpub}
+        extra={
+          <>
+            <FontSizeRow pr={pr} />
+            <LineHeightRow pr={pr} />
+            <MarginRow pr={pr} />
+          </>
+        }
+      />
       {nav && (
         <ReaderNav
           tab="bm"
@@ -146,3 +195,55 @@ export default function EpubReader({ book, initialLocator, initialPercent }: Rea
     </div>
   );
 }
+
+/** 字号档位按钮组(EPUB 独立档位,存 prefs.epub.sizeIdx)。 */
+function FontSizeRow({ pr }: { pr: ReturnType<typeof useReaderPrefs> }) {
+  return (
+    <SettingRow label="字号">
+      {FONT_SIZES.map((fs, i) => (
+        <Button
+          key={fs}
+          variant={pr.prefs.epub.sizeIdx === i ? "secondary" : "ghost"}
+          size="xs"
+          onClick={() => pr.update((p) => ({ ...p, epub: { ...p.epub, sizeIdx: i } }))}
+        >
+          {fs}
+        </Button>
+      ))}
+    </SettingRow>
+  );
+}
+
+/** EPUB 行距/边距档位(存 prefs.epub)。 */
+function LineHeightRow({ pr }: { pr: ReturnType<typeof useReaderPrefs> }) {
+  return (
+    <SettingRow label="行距">
+      {LINE_HEIGHTS.map((lh, i) => (
+        <Button
+          key={i}
+          variant={pr.prefs.epub.lineIdx === i ? "secondary" : "ghost"}
+          size="xs"
+          onClick={() => pr.update((p) => ({ ...p, epub: { ...p.epub, lineIdx: i } }))}
+        >
+          {lh}
+        </Button>
+      ))}
+    </SettingRow>
+  );
+}
+function MarginRow({ pr }: { pr: ReturnType<typeof useReaderPrefs> }) {
+  return (
+    <SettingRow label="边距">
+      {MARGINS.map((m, i) => (
+        <Button
+          key={m}
+          variant={pr.prefs.epub.marginIdx === i ? "secondary" : "ghost"}
+          size="xs"
+          onClick={() => pr.update((p) => ({ ...p, epub: { ...p.epub, marginIdx: i } }))}
+        >
+          {MARGIN_LABEL[m]}
+        </Button>
+      ))}
+    </SettingRow>
+  );
+}