fix: scope studio playback shortcuts

packages/studio/src/player/hooks/useTimelinePlayer.test.ts

@@ -3,6 +3,7 @@ import {
   buildStandaloneRootTimelineElement,
   mergeTimelineElementsPreservingDowngrades,
   resolveStandaloneRootCompositionSrc,
+  shouldIgnorePlaybackShortcutEvent,
   shouldIgnorePlaybackShortcutTarget,
 } from "./useTimelinePlayer";
 
@@ -12,6 +13,20 @@ function mockTargetMatching(selectorNeedle: string): EventTarget {
   } as unknown as EventTarget;
 }
 
+function mockKeyboardEvent(
+  code: string,
+  overrides: Partial<Pick<KeyboardEvent, "altKey" | "ctrlKey" | "metaKey" | "target">> = {},
+): Pick<KeyboardEvent, "altKey" | "ctrlKey" | "metaKey" | "code" | "target"> {
+  return {
+    altKey: false,
+    ctrlKey: false,
+    metaKey: false,
+    code,
+    target: mockTargetMatching("[data-missing]"),
+    ...overrides,
+  };
+}
+
 describe("buildStandaloneRootTimelineElement", () => {
   it("includes selector and source metadata for standalone composition fallback clips", () => {
     expect(
@@ -115,3 +130,46 @@ describe("shouldIgnorePlaybackShortcutTarget", () => {
     expect(shouldIgnorePlaybackShortcutTarget(mockTargetMatching("[data-missing]"))).toBe(false);
   });
 });
+
+describe("shouldIgnorePlaybackShortcutEvent", () => {
+  it("ignores modified playback shortcuts so browser and app chords can handle them", () => {
+    expect(
+      shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("ArrowLeft", { altKey: true })),
+    ).toBe(true);
+    expect(shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("KeyK", { ctrlKey: true }))).toBe(
+      true,
+    );
+    expect(shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("KeyL", { metaKey: true }))).toBe(
+      true,
+    );
+  });
+
+  it("defers Arrow frame shortcuts while caption edit mode has selected words", () => {
+    const captionSelection = { isCaptionEditMode: true, selectedCaptionSegmentCount: 1 };
+
+    expect(
+      shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("ArrowLeft"), captionSelection),
+    ).toBe(true);
+    expect(
+      shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("ArrowRight"), captionSelection),
+    ).toBe(true);
+    expect(shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("KeyJ"), captionSelection)).toBe(
+      false,
+    );
+  });
+
+  it("allows Arrow frame shortcuts when captions are not selected", () => {
+    expect(
+      shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("ArrowRight"), {
+        isCaptionEditMode: true,
+        selectedCaptionSegmentCount: 0,
+      }),
+    ).toBe(false);
+    expect(
+      shouldIgnorePlaybackShortcutEvent(mockKeyboardEvent("ArrowRight"), {
+        isCaptionEditMode: false,
+        selectedCaptionSegmentCount: 1,
+      }),
+    ).toBe(false);
+  });
+});

packages/studio/src/player/hooks/useTimelinePlayer.ts

@@ -2,6 +2,7 @@ import { useRef, useCallback } from "react";
 import { usePlayerStore, liveTime, type TimelineElement } from "../store/playerStore";
 import { useMountEffect } from "../../hooks/useMountEffect";
 import { frameToSeconds, STUDIO_PREVIEW_FPS } from "../lib/time";
+import { useCaptionStore } from "../../captions/store";
 
 interface PlaybackAdapter {
   play: () => void;
@@ -107,6 +108,7 @@ function applyMediaMetadataFromElement(entry: TimelineElement, el: Element): voi
 }
 
 const SHUTTLE_SPEEDS = [1, 2, 4] as const;
+const PLAYBACK_FRAME_STEP_CODES = new Set(["ArrowLeft", "ArrowRight"]);
 const PLAYBACK_SHORTCUT_IGNORED_SELECTOR = [
   "input",
   "textarea",
@@ -137,6 +139,32 @@ export function shouldIgnorePlaybackShortcutTarget(target: EventTarget | null):
   );
 }
 
+interface PlaybackShortcutCaptionState {
+  isCaptionEditMode: boolean;
+  selectedCaptionSegmentCount: number;
+}
+
+type PlaybackShortcutEvent = Pick<
+  KeyboardEvent,
+  "altKey" | "ctrlKey" | "metaKey" | "code" | "target"
+>;
+
+export function shouldIgnorePlaybackShortcutEvent(
+  event: PlaybackShortcutEvent,
+  captionState: PlaybackShortcutCaptionState = {
+    isCaptionEditMode: false,
+    selectedCaptionSegmentCount: 0,
+  },
+): boolean {
+  if (event.metaKey || event.ctrlKey || event.altKey) return true;
+  if (shouldIgnorePlaybackShortcutTarget(event.target)) return true;
+  return (
+    PLAYBACK_FRAME_STEP_CODES.has(event.code) &&
+    captionState.isCaptionEditMode &&
+    captionState.selectedCaptionSegmentCount > 0
+  );
+}
+
 /**
  * Parse [data-start] elements from a Document into TimelineElement[].
  * Shared helper — used by onIframeLoad fallback, handleMessage, and enrichMissingCompositions.
@@ -698,7 +726,15 @@ export function useTimelinePlayer() {
   const handlePlaybackKeyDown = useCallback(
     (e: KeyboardEvent) => {
       if (e.defaultPrevented) return;
-      if (shouldIgnorePlaybackShortcutTarget(e.target)) return;
+      const captionState = useCaptionStore.getState();
+      if (
+        shouldIgnorePlaybackShortcutEvent(e, {
+          isCaptionEditMode: captionState.isEditMode,
+          selectedCaptionSegmentCount: captionState.selectedSegmentIds.size,
+        })
+      ) {
+        return;
+      }
       pressedCodesRef.current.add(e.code);
       if (e.code === "Space") {
         e.preventDefault();