feat: add an option to invert image color in dark mode (#1223)

apps/readest-app/src/app/reader/components/ViewMenu.tsx

@@ -33,9 +33,12 @@ const ViewMenu: React.FC<ViewMenuProps> = ({
   const { getView, getViewSettings, setViewSettings } = useReaderStore();
   const viewSettings = getViewSettings(bookKey)!;
 
-  const { themeMode, setThemeMode } = useThemeStore();
+  const { themeMode, isDarkMode, setThemeMode } = useThemeStore();
   const [isScrolledMode, setScrolledMode] = useState(viewSettings!.scrolled);
   const [zoomLevel, setZoomLevel] = useState(viewSettings!.zoomLevel!);
+  const [invertImgColorInDark, setInvertImgColorInDark] = useState(
+    viewSettings!.invertImgColorInDark,
+  );
 
   const zoomIn = () => setZoomLevel((prev) => Math.min(prev + ZOOM_STEP, MAX_ZOOM_LEVEL));
   const zoomOut = () => setZoomLevel((prev) => Math.max(prev - ZOOM_STEP, MIN_ZOOM_LEVEL));
@@ -76,6 +79,12 @@ const ViewMenu: React.FC<ViewMenuProps> = ({
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [zoomLevel]);
 
+  useEffect(() => {
+    if (invertImgColorInDark === viewSettings.invertImgColorInDark) return;
+    saveViewSettings(envConfig, bookKey, 'invertImgColorInDark', invertImgColorInDark, true, true);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [invertImgColorInDark]);
+
   return (
     <div
       tabIndex={0}
@@ -135,6 +144,12 @@ const ViewMenu: React.FC<ViewMenuProps> = ({
         Icon={themeMode === 'dark' ? BiMoon : themeMode === 'light' ? BiSun : TbSunMoon}
         onClick={cycleThemeMode}
       />
+      <MenuItem
+        label={_('Invert Image In Dark Mode')}
+        disabled={!isDarkMode}
+        Icon={invertImgColorInDark ? MdCheck : undefined}
+        onClick={() => setInvertImgColorInDark(!invertImgColorInDark)}
+      />
     </div>
   );
 };