feat: filter viewed code review files

packages/ui/src/features/code-review/commentFileFilter.ts

@@ -62,6 +62,52 @@ export function filterReviewItemsByFilePaths(
   return filteredItems;
 }
 
+export function filterReviewItemsByViewedState(
+  items: ReviewListItem[],
+  currentSignatures: ReadonlyMap<string, string>,
+  viewedRecord: Readonly<Record<string, string>>,
+): ReviewListItem[] {
+  const filteredItems: ReviewListItem[] = [];
+  let pendingSectionItems: ReviewListItem[] = [];
+
+  for (const item of items) {
+    if (!item.filePaths) {
+      pendingSectionItems = [item];
+      continue;
+    }
+
+    const signature = item.scrollKey
+      ? currentSignatures.get(item.scrollKey)
+      : undefined;
+    if (
+      signature !== undefined &&
+      item.scrollKey !== undefined &&
+      viewedRecord[item.scrollKey] === signature
+    ) {
+      continue;
+    }
+
+    filteredItems.push(...pendingSectionItems, item);
+    pendingSectionItems = [];
+  }
+
+  return filteredItems;
+}
+
+export function resolveVisibleActiveFilePath(
+  items: ReviewListItem[],
+  activeFilePath: string | null,
+): string | null {
+  if (
+    activeFilePath &&
+    items.some((item) => item.filePaths?.includes(activeFilePath))
+  ) {
+    return activeFilePath;
+  }
+
+  return items.find((item) => item.scrollKey)?.scrollKey ?? null;
+}
+
 export function deriveCommentFileFilterState({
   items,
   requestedFilter,

packages/ui/src/features/code-review/components/DiffSettingsMenu.tsx

@@ -16,13 +16,17 @@ interface DiffSettingsMenuProps {
   unresolvedCommentedFileCount: number;
   commentFilter: CommentFileFilter;
   onCommentFilterChange?: (filter: CommentFileFilter) => void;
+  hideViewedFiles: boolean;
+  onHideViewedFilesChange: (hideViewed: boolean) => void;
 }
 
 export function DiffSettingsMenu({
   commentedFileCount,
   unresolvedCommentedFileCount,
   commentFilter,
   onCommentFilterChange,
+  hideViewedFiles,
+  onHideViewedFilesChange,
 }: DiffSettingsMenuProps) {
   const wordWrap = useDiffViewerStore((s) => s.wordWrap);
   const toggleWordWrap = useDiffViewerStore((s) => s.toggleWordWrap);
@@ -79,6 +83,11 @@ export function DiffSettingsMenu({
           {hideWhitespaceChanges ? "Show whitespace" : "Hide whitespace"}
         </DropdownMenuItem>
         <DropdownMenuSeparator />
+        <DropdownMenuItem
+          onClick={() => onHideViewedFilesChange(!hideViewedFiles)}
+        >
+          {hideViewedFiles ? "Show viewed files" : "Hide viewed files"}
+        </DropdownMenuItem>
         <DropdownMenuItem onClick={handleToggleReviewComments}>
           {showReviewComments ? "Hide review comments" : "Show review comments"}
         </DropdownMenuItem>

packages/ui/src/features/code-review/components/ReviewShell.tsx

@@ -16,8 +16,10 @@ import {
 import { VList, type VListHandle } from "virtua";
 import {
   deriveCommentFileFilterState,
+  filterReviewItemsByViewedState,
   getEmptyReviewMessage,
   type ReviewListItem,
+  resolveVisibleActiveFilePath,
 } from "../commentFileFilter";
 import {
   REVIEW_LIST_BUFFER_PX,
@@ -155,6 +157,12 @@ export function ReviewShell({
   const setCommentFileFilter = useReviewNavigationStore(
     (state) => state.setCommentFileFilter,
   );
+  const hideViewedFiles = useReviewNavigationStore(
+    (state) => state.hideViewedFiles[taskId] ?? false,
+  );
+  const setHideViewedFiles = useReviewNavigationStore(
+    (state) => state.setHideViewedFiles,
+  );
   const {
     activeFilter: activeCommentFilter,
     visibleItems,
@@ -170,9 +178,21 @@ export function ReviewShell({
       }),
     [commentFilter, commentedFilePaths, items, unresolvedCommentedFilePaths],
   );
+  const filteredItems = useMemo(() => {
+    if (!hideViewedFiles) return visibleItems;
+    return filterReviewItemsByViewedState(
+      visibleItems,
+      currentSignatures,
+      viewedRecord,
+    );
+  }, [currentSignatures, hideViewedFiles, viewedRecord, visibleItems]);
+  const filteredFileCount = useMemo(
+    () => filteredItems.filter((item) => item.filePaths).length,
+    [filteredItems],
+  );
   const visibleItemIndexByFilePath = useMemo(
-    () => buildItemIndex(visibleItems),
-    [visibleItems],
+    () => buildItemIndex(filteredItems),
+    [filteredItems],
   );
 
   const workerFactory = useCallback(
@@ -253,8 +273,28 @@ export function ReviewShell({
   const setActiveFilePath = useReviewNavigationStore(
     (s) => s.setActiveFilePath,
   );
+  const activeFilePath = useReviewNavigationStore(
+    (s) => s.activeFilePaths[taskId] ?? null,
+  );
   const clearTask = useReviewNavigationStore((s) => s.clearTask);
 
+  useEffect(() => {
+    if (!hideViewedFiles || !activeFilePath) return;
+    const nextActiveFilePath = resolveVisibleActiveFilePath(
+      filteredItems,
+      activeFilePath,
+    );
+    if (nextActiveFilePath === activeFilePath) return;
+    lastActiveRef.current = nextActiveFilePath;
+    setActiveFilePath(taskId, nextActiveFilePath);
+  }, [
+    activeFilePath,
+    filteredItems,
+    hideViewedFiles,
+    setActiveFilePath,
+    taskId,
+  ]);
+
   useEffect(() => {
     return () => {
       if (navigationFrameRef.current !== null) {
@@ -348,11 +388,13 @@ export function ReviewShell({
         <Spinner size="2" />
       </Flex>
     );
-  } else if (isEmpty || visibleItems.length === 0) {
+  } else if (isEmpty || filteredItems.length === 0) {
     reviewContent = (
       <Flex align="center" justify="center" className="min-h-0 flex-1">
         <Text color="gray" className="text-sm">
-          {getEmptyReviewMessage(activeCommentFilter)}
+          {hideViewedFiles
+            ? "No unviewed file changes"
+            : getEmptyReviewMessage(activeCommentFilter)}
         </Text>
       </Flex>
     );
@@ -366,7 +408,7 @@ export function ReviewShell({
         shift={false}
         style={{ scrollbarGutter: "stable" }}
         onScroll={handleScroll}
-        data={visibleItems}
+        data={filteredItems}
       >
         {renderItem}
       </VList>
@@ -413,6 +455,11 @@ export function ReviewShell({
                 ? (filter) => setCommentFileFilter(taskId, filter)
                 : undefined
             }
+            hideViewedFiles={hideViewedFiles}
+            filteredFileCount={filteredFileCount}
+            onHideViewedFilesChange={(hideViewed) =>
+              setHideViewedFiles(taskId, hideViewed)
+            }
             linesAdded={linesAdded}
             linesRemoved={linesRemoved}
             allExpanded={allExpanded}

packages/ui/src/features/code-review/components/ReviewToolbar.tsx

@@ -28,6 +28,9 @@ interface ReviewToolbarProps {
   unresolvedCommentedFileCount: number;
   commentFilter: CommentFileFilter;
   onCommentFilterChange?: (filter: CommentFileFilter) => void;
+  hideViewedFiles: boolean;
+  filteredFileCount: number;
+  onHideViewedFilesChange: (hideViewed: boolean) => void;
   linesAdded: number;
   linesRemoved: number;
   allExpanded: boolean;
@@ -82,6 +85,9 @@ export const ReviewToolbar = memo(function ReviewToolbar({
   unresolvedCommentedFileCount,
   commentFilter,
   onCommentFilterChange,
+  hideViewedFiles,
+  filteredFileCount,
+  onHideViewedFilesChange,
   allExpanded,
   onExpandAll,
   onCollapseAll,
@@ -108,13 +114,18 @@ export const ReviewToolbar = memo(function ReviewToolbar({
     setReviewMode(taskId, "closed");
   };
 
-  const { count: visibleFileCount, label: fileCountLabel } =
-    getVisibleFileSummary(
-      commentFilter,
-      fileCount,
-      commentedFileCount,
-      unresolvedCommentedFileCount,
-    );
+  const visibleFileSummary = getVisibleFileSummary(
+    commentFilter,
+    fileCount,
+    commentedFileCount,
+    unresolvedCommentedFileCount,
+  );
+  const visibleFileCount = hideViewedFiles
+    ? filteredFileCount
+    : visibleFileSummary.count;
+  const fileCountLabel = hideViewedFiles
+    ? formatFileCount(filteredFileCount, "not viewed")
+    : visibleFileSummary.label;
 
   return (
     <Flex
@@ -129,7 +140,7 @@ export const ReviewToolbar = memo(function ReviewToolbar({
     >
       <Flex align="center" gap="2">
         <Text className="font-medium text-[13px]">{fileCountLabel}</Text>
-        {visibleFileCount > 0 && (
+        {!hideViewedFiles && visibleFileCount > 0 && (
           <Text className="text-(--gray-10) text-[13px]">
             {viewedCount}/{visibleFileCount} viewed
           </Text>
@@ -216,6 +227,8 @@ export const ReviewToolbar = memo(function ReviewToolbar({
           unresolvedCommentedFileCount={unresolvedCommentedFileCount}
           commentFilter={commentFilter}
           onCommentFilterChange={onCommentFilterChange}
+          hideViewedFiles={hideViewedFiles}
+          onHideViewedFilesChange={onHideViewedFilesChange}
         />
 
         <Tooltip content="Close review">

packages/ui/src/features/code-review/reviewNavigationStore.test.ts

@@ -9,6 +9,7 @@ describe("reviewNavigationStore", () => {
       reviewModes: {},
       selectedPrUrls: {},
       commentFileFilters: {},
+      hideViewedFiles: {},
     });
   });
 
@@ -28,6 +29,20 @@ describe("reviewNavigationStore", () => {
     ).toBeUndefined();
   });
 
+  it("stores and clears the viewed-file filter per task", () => {
+    const store = useReviewNavigationStore.getState();
+    store.setHideViewedFiles("task-1", true);
+
+    expect(useReviewNavigationStore.getState().hideViewedFiles["task-1"]).toBe(
+      true,
+    );
+
+    store.clearTask("task-1");
+    expect(useReviewNavigationStore.getState().hideViewedFiles["task-1"]).toBe(
+      false,
+    );
+  });
+
   it("clears the comment filter when navigating to a file", () => {
     const store = useReviewNavigationStore.getState();
     store.setCommentFileFilter("task-1", "unresolved");

packages/ui/src/features/code-review/reviewNavigationStore.ts

@@ -9,6 +9,7 @@ interface ReviewNavigationStoreState {
   reviewModes: Record<string, ReviewMode>;
   selectedPrUrls: Record<string, string | undefined>;
   commentFileFilters: Record<string, CommentFileFilter>;
+  hideViewedFiles: Record<string, boolean>;
 }
 
 interface ReviewNavigationStoreActions {
@@ -19,6 +20,7 @@ interface ReviewNavigationStoreActions {
   setReviewMode: (taskId: string, mode: ReviewMode) => void;
   setSelectedPrUrl: (taskId: string, url: string) => void;
   setCommentFileFilter: (taskId: string, filter: CommentFileFilter) => void;
+  setHideViewedFiles: (taskId: string, hideViewed: boolean) => void;
   getReviewMode: (taskId: string) => ReviewMode;
 }
 
@@ -32,6 +34,7 @@ export const useReviewNavigationStore = create<ReviewNavigationStore>()(
     reviewModes: {},
     selectedPrUrls: {},
     commentFileFilters: {},
+    hideViewedFiles: {},
 
     setActiveFilePath: (taskId, path) =>
       set((state) => ({
@@ -45,6 +48,7 @@ export const useReviewNavigationStore = create<ReviewNavigationStore>()(
           ...state.commentFileFilters,
           [taskId]: "none",
         },
+        hideViewedFiles: { ...state.hideViewedFiles, [taskId]: false },
       })),
 
     clearScrollRequest: (taskId) =>
@@ -61,6 +65,7 @@ export const useReviewNavigationStore = create<ReviewNavigationStore>()(
           [taskId]: "none",
         },
         selectedPrUrls: { ...state.selectedPrUrls, [taskId]: undefined },
+        hideViewedFiles: { ...state.hideViewedFiles, [taskId]: false },
       })),
 
     setReviewMode: (taskId, mode) =>
@@ -87,6 +92,14 @@ export const useReviewNavigationStore = create<ReviewNavigationStore>()(
         },
       })),
 
+    setHideViewedFiles: (taskId, hideViewed) =>
+      set((state) => ({
+        hideViewedFiles: {
+          ...state.hideViewedFiles,
+          [taskId]: hideViewed,
+        },
+      })),
+
     getReviewMode: (taskId) => get().reviewModes[taskId] ?? "closed",
   }),
 );