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perf(studio): stabilize virtualized clip gestures #2704
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90 changes: 90 additions & 0 deletions
90
packages/studio/src/player/components/TimelineGestureOverlay.test.tsx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // @vitest-environment happy-dom | ||
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| import React, { act } from "react"; | ||
| import { createRoot } from "react-dom/client"; | ||
| import { afterEach, describe, expect, it } from "vitest"; | ||
| import { defaultTimelineTheme } from "./timelineTheme"; | ||
| import { TimelineGestureOverlay } from "./TimelineGestureOverlay"; | ||
| import type { DraggedClipState } from "./timelineClipDragTypes"; | ||
| import { getTrackStyle } from "./useTimelineTrackLayout"; | ||
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| Object.assign(globalThis, { IS_REACT_ACT_ENVIRONMENT: true }); | ||
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| const drag: DraggedClipState = { | ||
| pointerId: 0, | ||
| element: { id: "hero", tag: "div", start: 2, duration: 3, track: 1 }, | ||
| originClientX: 100, | ||
| originClientY: 100, | ||
| originScrollLeft: 0, | ||
| originScrollTop: 0, | ||
| pointerClientX: 350, | ||
| pointerClientY: 240, | ||
| pointerOffsetX: 20, | ||
| pointerOffsetY: 10, | ||
| previewStart: 4, | ||
| previewTrack: 2, | ||
| insertRow: null, | ||
| snapTime: null, | ||
| snapType: null, | ||
| started: true, | ||
| }; | ||
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| afterEach(() => document.body.replaceChildren()); | ||
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| describe("TimelineGestureOverlay", () => { | ||
| it("keeps the drag actor mounted without a source-row node", () => { | ||
| const host = document.createElement("div"); | ||
| document.body.append(host); | ||
| const root = createRoot(host); | ||
| const scroll = { | ||
| scrollLeft: 500, | ||
| scrollTop: 300, | ||
| getBoundingClientRect: () => ({ left: 50, top: 40 }), | ||
| } as HTMLDivElement; | ||
| act(() => { | ||
| root.render( | ||
| <TimelineGestureOverlay | ||
| drag={drag} | ||
| scrollRef={{ current: scroll }} | ||
| pixelsPerSecond={100} | ||
| rowHeight={42} | ||
| selectedElementId="hero" | ||
| currentTime={4} | ||
| theme={defaultTimelineTheme} | ||
| getTrackStyle={getTrackStyle} | ||
| />, | ||
| ); | ||
| }); | ||
| const actor = host.querySelector<HTMLElement>('[data-timeline-gesture-actor="hero"]'); | ||
| expect(actor?.style.left).toBe("780px"); | ||
| expect(actor?.style.top).toBe("490px"); | ||
| expect(actor?.querySelector(".timeline-clip")).not.toBeNull(); | ||
| expect(actor?.querySelector("[data-el-id]")).toBeNull(); | ||
| expect(actor?.querySelector("[data-clip]")).toBeNull(); | ||
| expect(host.querySelector("[data-source-row]")).toBeNull(); | ||
| act(() => root.unmount()); | ||
| }); | ||
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| it("keeps the stable overlay host after terminal cleanup", () => { | ||
| const host = document.createElement("div"); | ||
| document.body.append(host); | ||
| const root = createRoot(host); | ||
| act(() => { | ||
| root.render( | ||
| <TimelineGestureOverlay | ||
| drag={null} | ||
| scrollRef={{ current: null }} | ||
| pixelsPerSecond={100} | ||
| rowHeight={42} | ||
| selectedElementId={null} | ||
| currentTime={0} | ||
| theme={defaultTimelineTheme} | ||
| getTrackStyle={getTrackStyle} | ||
| />, | ||
| ); | ||
| }); | ||
| expect(host.querySelector("[data-timeline-gesture-overlay]")).not.toBeNull(); | ||
| expect(host.querySelector("[data-timeline-gesture-actor]")).toBeNull(); | ||
| act(() => root.unmount()); | ||
| }); | ||
| }); |
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🟡 (flicker lens — non-blocking)
resizingElementIdsis a fresh array on every render wheneverresizingClipis set:resizingClip?.groupPreview?.map((change) => change.key) ?? (resizingClip ? [getTimelineElementIdentity(resizingClip.element)] : undefined). The two consuminguseMemos atuseTimelineRowVirtualization.ts:80-86and:88-101listresizingElementIds(orresizingRowKeys) in their dep arrays, so the array's identity change on every parent re-render defeats both memos during an active resize. Idle path is safe (returnsundefined, stable). ConsideruseMemo(() => resizingClip?.groupPreview?.map(...) ?? ..., [resizingClip])to preserve reference stability across parent re-renders while a resize is in flight — otherwise the row-window recomputes on every parent tick. — Rames D Jusso