diff --git a/packages/studio/src/components/StudioRightPanel.tsx b/packages/studio/src/components/StudioRightPanel.tsx
index cac09bc94..a63ee3a74 100644
--- a/packages/studio/src/components/StudioRightPanel.tsx
+++ b/packages/studio/src/components/StudioRightPanel.tsx
@@ -12,7 +12,10 @@ import { usePreviewVariablesStore } from "../hooks/previewVariablesStore";
import type { RenderJob } from "./renders/useRenderQueue";
import type { BlockParam } from "@hyperframes/core/registry";
import type { IframeWindow } from "../player/lib/playbackTypes";
-import { STUDIO_INSPECTOR_PANELS_ENABLED } from "./editor/manualEditingAvailability";
+import {
+ STUDIO_FLAT_INSPECTOR_ENABLED,
+ STUDIO_INSPECTOR_PANELS_ENABLED,
+} from "./editor/manualEditingAvailability";
import type { Composition } from "@hyperframes/sdk";
import type { EditHistoryKind } from "../utils/editHistory";
import { useSlideshowPersist, type UseSlideshowPersistParams } from "../hooks/useSlideshowPersist";
@@ -80,6 +83,7 @@ export function StudioRightPanel({
setRightPanelTab,
rightInspectorPanes,
toggleRightInspectorPane,
+ setExclusiveRightInspectorPane,
handlePanelResizeStart,
handlePanelResizeMove,
handlePanelResizeEnd,
@@ -223,6 +227,13 @@ export function StudioRightPanel({
setRightPanelTab(pane);
return;
}
+ // Flat inspector: Layers always renders full-height by itself (see the
+ // render branch below), so the two panes are mutually exclusive here —
+ // otherwise both tabs could show "active" while only one actually shows.
+ if (STUDIO_FLAT_INSPECTOR_ENABLED) {
+ setExclusiveRightInspectorPane(pane);
+ return;
+ }
toggleRightInspectorPane(pane);
};
@@ -516,7 +527,7 @@ export function StudioRightPanel({
domEditSaveTimestampRef={domEditSaveTimestampRef}
recordEdit={recordEdit}
/>
- ) : layersPaneOpen && designPaneOpen ? (
+ ) : layersPaneOpen && designPaneOpen && !STUDIO_FLAT_INSPECTOR_ENABLED ? (
{
+ document.body.innerHTML = "";
+ vi.doUnmock("../components/editor/manualEditingAvailability");
+ vi.resetModules();
+});
+
+function renderPanelLayoutWith(hook: typeof usePanelLayout) {
+ const host = document.createElement("div");
+ document.body.append(host);
+ const root = createRoot(host);
+ let current: ReturnType | null = null;
+
+ function Harness() {
+ current = hook();
+ return null;
+ }
+
+ act(() => {
+ root.render(React.createElement(Harness));
+ });
+
+ return {
+ getState: (): ReturnType => {
+ if (!current) throw new Error("usePanelLayout did not render");
+ return current;
+ },
+ unmount: () => act(() => root.unmount()),
+ };
+}
+
+function renderPanelLayout() {
+ return renderPanelLayoutWith(usePanelLayout);
+}
+
+describe("usePanelLayout — right inspector panes", () => {
+ it("toggleRightInspectorPane independently flips one pane, allowing both open at once", () => {
+ const harness = renderPanelLayout();
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: false, design: true });
+
+ act(() => harness.getState().toggleRightInspectorPane("layers"));
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: true, design: true });
+
+ harness.unmount();
+ });
+
+ it("toggleRightInspectorPane refuses to turn off the last remaining pane", () => {
+ const harness = renderPanelLayout();
+ act(() => harness.getState().toggleRightInspectorPane("design"));
+ // Only "design" was on; toggling it off would leave both false — guarded.
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: false, design: true });
+ harness.unmount();
+ });
+
+ it("setExclusiveRightInspectorPane is radio-style — selecting one turns the other off", () => {
+ const harness = renderPanelLayout();
+ act(() => harness.getState().toggleRightInspectorPane("layers"));
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: true, design: true });
+
+ act(() => harness.getState().setExclusiveRightInspectorPane("layers"));
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: true, design: false });
+
+ act(() => harness.getState().setExclusiveRightInspectorPane("design"));
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: false, design: true });
+
+ harness.unmount();
+ });
+
+ it("setRightPanelTab additively opens a pane when the flat inspector is off (legacy behavior)", async () => {
+ vi.resetModules();
+ vi.doMock("../components/editor/manualEditingAvailability", async () => {
+ const actual = await vi.importActual<
+ typeof import("../components/editor/manualEditingAvailability")
+ >("../components/editor/manualEditingAvailability");
+ return { ...actual, STUDIO_FLAT_INSPECTOR_ENABLED: false };
+ });
+ const { usePanelLayout: usePanelLayoutFlatOff } = await import("./usePanelLayout");
+ const harness = renderPanelLayoutWith(usePanelLayoutFlatOff);
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: false, design: true });
+
+ act(() => harness.getState().setRightPanelTab("layers"));
+ // Legacy (split-view) behavior: additive, both panes end up open.
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: true, design: true });
+
+ harness.unmount();
+ });
+
+ it("setRightPanelTab is flat-aware: exclusivity holds for callers other than a direct in-panel tab click", async () => {
+ vi.resetModules();
+ vi.doMock("../components/editor/manualEditingAvailability", async () => {
+ const actual = await vi.importActual<
+ typeof import("../components/editor/manualEditingAvailability")
+ >("../components/editor/manualEditingAvailability");
+ return { ...actual, STUDIO_FLAT_INSPECTOR_ENABLED: true };
+ });
+ const { usePanelLayout: usePanelLayoutFlatOn } = await import("./usePanelLayout");
+ const harness = renderPanelLayoutWith(usePanelLayoutFlatOn);
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: false, design: true });
+
+ // Element-select / block-params-close / header Inspector-button callers
+ // all reach setRightPanelTab directly, not through the in-panel tab
+ // click's own setExclusiveRightInspectorPane call — this must still
+ // enforce exclusivity under the flat flag, or both tabs end up
+ // highlighted while only one pane actually renders.
+ act(() => harness.getState().setRightPanelTab("layers"));
+ expect(harness.getState().rightInspectorPanes).toEqual({ layers: true, design: false });
+
+ harness.unmount();
+ });
+});
diff --git a/packages/studio/src/hooks/usePanelLayout.ts b/packages/studio/src/hooks/usePanelLayout.ts
index 384e983f6..df94b244e 100644
--- a/packages/studio/src/hooks/usePanelLayout.ts
+++ b/packages/studio/src/hooks/usePanelLayout.ts
@@ -6,6 +6,7 @@ import type {
} from "../utils/studioHelpers";
import { readStudioUiPreferences, writeStudioUiPreferences } from "../utils/studioUiPreferences";
import { trackStudioEvent } from "../utils/studioTelemetry";
+import { STUDIO_FLAT_INSPECTOR_ENABLED } from "../components/editor/manualEditingAvailability";
export interface InitialPanelLayoutState {
rightCollapsed?: boolean | null;
@@ -80,7 +81,20 @@ export function usePanelLayout(initialState?: InitialPanelLayoutState) {
const trackedSetRightPanelTab = useCallback(
(tab: RightPanelTab) => {
if (tab === "design" || tab === "layers") {
- setRightInspectorPanes((panes) => ({ ...panes, [tab]: true }));
+ // Flat inspector: Layers always renders full-height by itself (see
+ // StudioRightPanel's render gate), so this MUST land on the same
+ // radio-style exclusivity setExclusiveRightInspectorPane enforces for
+ // the direct in-panel tab click — every OTHER path that reaches here
+ // (element select, closing block-params, the header Inspector
+ // button, and this function's own callers outside an active
+ // inspector tab) would otherwise additively leave both panes `true`
+ // and reproduce the "both tabs highlight, only one renders" bug this
+ // still-additive branch used to cause under the flat flag.
+ setRightInspectorPanes(
+ STUDIO_FLAT_INSPECTOR_ENABLED
+ ? { design: tab === "design", layers: tab === "layers" }
+ : (panes) => ({ ...panes, [tab]: true }),
+ );
}
setRightPanelTab(tab);
trackStudioEvent("tab_switch", { panel: "right_panel", tab });
@@ -96,6 +110,14 @@ export function usePanelLayout(initialState?: InitialPanelLayoutState) {
});
}, []);
+ // Radio-style variant for the flat inspector: Layers always renders full-
+ // height by itself there (never split-shared with Design), so leaving both
+ // panes independently toggleable would highlight both tabs as "active"
+ // while only one actually shows. Selecting one turns the other off.
+ const setExclusiveRightInspectorPane = useCallback((pane: RightInspectorPane) => {
+ setRightInspectorPanes({ design: pane === "design", layers: pane === "layers" });
+ }, []);
+
return {
leftWidth,
setLeftWidth,
@@ -109,6 +131,7 @@ export function usePanelLayout(initialState?: InitialPanelLayoutState) {
setRightPanelTab: trackedSetRightPanelTab,
rightInspectorPanes,
toggleRightInspectorPane,
+ setExclusiveRightInspectorPane,
toggleLeftSidebar,
handlePanelResizeStart,
handlePanelResizeMove,