feat(cursor): editable cursor choreography — the editor layer, on the model and compositor halves - #556
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feat(cursor): editable cursor choreography — the editor layer, on the model and compositor halves#556EtienneLescot wants to merge 7 commits into
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…ompositor Groundwork for the cursor choreography proposed in #113, whose editor was written against the pre-1.8.0 tree and cannot be rebased onto it. This is the half that is shared infrastructure rather than feature UI: the JS→Rust contract, and the sampling. `SceneCursor` gains a `motion` list. Anchors arrive RESOLVED -- the editor owns discovering rests, clicks and manual splits, and hands over absolute normalised points -- so the compositor holds pure geometry and the same list always yields the same path. The field is `#[serde(default)]` on the Rust side: every existing scene predates it and must stay readable. `CursorTrack::with_motion` applies the presets by rewriting the sample list ONCE, the way `smoothed` already does, rather than per frame. That is what keeps the track a pure function of `t`, so a seek lands on the same image as linear playback and the preview matches the export -- the constraint `smooth_follow_samples` documents. Regions resample at 240 Hz internally because the curve is analytic while telemetry may hold only a handful of points across a region; reusing those would draw an arc as a polyline. Motion is applied BEFORE smoothing at both call sites. The preset defines the trajectory and smoothing is a render filter over whatever trajectory exists; the other order would leave edited stretches crisp inside a damped track and make the slider inert on them. In the live preview the regeneration moved below the scene block, since the regions come from `full_scene` -- read above it they would be one iteration stale, and an edit would surface a frame late or not at all if nothing else changed. The geometry is a direct port of `sampleCursorMotionRegion` from #113, including the speed rounding, which feeds an exponent and is therefore not cosmetic. What is NOT here: the editor UI (draggable control points, timeline segments, inspector) and the anchor discovery that feeds these regions. That is the feature, and it belongs to its author. Refs #113
Lifted verbatim from #116, which cannot be rebased: its base is 428 commits behind and the first commit alone conflicts on 56 files. The module itself needs none of that history -- it lands on main untouched, with its 17 tests passing and no new type errors. This is the pure model: presets, easing, speed, anchor kinds, rest and click detection, and the sampling that turns a region into a position. No rendering, no editor, no dependency on anything the 1.8.0 merge removed. Taken from #116 rather than #113. The two carry different lineages of this module, not an old and a new one: #116's knows about source time and crop projection, which is what its editor and preview call into. #113's is the shape the deleted web editor wanted. Not wired to anything yet. The timeline lane and inspector controls need an `AxcutCursorMotionRegion` on the document schema first, and #116's preview layer is built on Pixi, which main dropped when the preview moved to the native compositor -- that part needs rebuilding on the native overlay rather than porting. The compositor already samples these presets for preview and export (see `feat/cursor-motion-contract`), so the rendering half is done. Co-authored-by: Etienne Lescot <etiennelescot@gmail.com> Refs #116, #113
…o claude/pr-113-116-merge-16ed41
… the preview Builds the editor half of #548 on the v4 shell. The model (#116, already on main as `contrib/cursor-choreography`) and the compositor half (`feat/cursor-motion-contract`) were both written; nothing connected them to an editor, so the feature was invisible. The interaction model is @YoneRai12's, from #113, rebuilt rather than ported: every file that PR touches was deleted from main on 1 Aug when the v4 editor became the only editor. Sections split at rests and clicks, `recorded` at 1x by default so creating them changes nothing, speed reshaping progress inside a section that still ends on the recorded click at its original time. Two faults in #113 are fixed rather than reproduced: its panel had no label for the `recorded` preset, so the first button in the grid rendered blank, and its speed help text described a leading pause its own code comment says was reverted for looking broken. `cursorMotionRegions` mirrors `zoomRanges` — a document-level array with the shared clip anchor, additive with a `[]` default, so old projects load unchanged and no schema version bump is needed. What does NOT mirror the zoom lane: these pills never coalesce and never drag. Two touching sections with the same preset are still two sections, and being individually selectable is the feature; their boundaries are anchors the recording placed, not a span to stretch. `sceneDescription` emits the SOURCE span, deliberately not projected the way zoom and annotation regions are: the compositor applies these once to the cursor track, which is already loaded in that clock. Known gap, commented at the site: `Scene.cursor.motion` carries no owner, so in a project whose clips draw on two different recordings the second one's regions land on the first one's track. The fix belongs in the contract. Also unwired: auto-split of an existing section, GIF export, the agent tools and the CLI. Eleven locales carry English placeholders; French is translated. Co-authored-by: YoneRai12 <183966348+YoneRai12@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Refs #548, #113, #116
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughCursor choreography adds editable cursor-motion regions to the document model, timeline store, native scene contract, compositor, preview, inspector, timeline lane, and localized interface. It supports presets, easing, speed, cycles, splitting, bulk updates, control-point editing, and recorded-path playback. ChangesCursor motion choreography
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to Cursor-motion edits are persisted as whole-document snapshots, so overlapping edits could overwrite newer changes or leave undo history inconsistent. The feature is otherwise backward-compatible, but this save-race risk needs explicit owner awareness or follow-up. Sequence Diagram(s)sequenceDiagram
participant Editor
participant useTimeline
participant PreviewCanvas
participant CursorMotionPathOverlay
participant NativeScene
participant Compositor
Editor->>useTimeline: create or update cursor-motion region
useTimeline->>NativeScene: persist cursor.motion data
Editor->>PreviewCanvas: provide selected region and callbacks
PreviewCanvas->>CursorMotionPathOverlay: provide telemetry and region
CursorMotionPathOverlay->>useTimeline: commit control-point change
NativeScene->>Compositor: provide clip-owned motion regions
Compositor->>Compositor: sample motion before smoothing
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description follows the repository template and covers the summary, related issues, change type, release impact, desktop impact, visual status, testing, known gaps, and compatibility behavior. Screenshots are not attached, but the omission is acknowledged and the description remains sufficiently complete. Full details: Linked Issues checkExplanation The PR implements the main cursor choreography requirements in [ Resolution Implement auto-splitting for an existing cursor-motion section at qualifying rests and clicks, or update [ Full details: Out of Scope Changes checkExplanation The changes remain within the cursor choreography scope. Localization, accessibility, defensive document handling, clip ownership, overlap precedence, cut protection, tests, and fixture updates directly support the feature and its compatibility requirements. Full details: Docstring CoverageExplanation Docstring coverage is 40.74% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 81 functions across 37 files. (22 skipped: 22 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/compositor/src/cursor.rs`:
- Line 258: Update the sampling loop over active regions so overlapping spans
retain last-region-wins semantics between sample times: sample only each
region’s visible sub-spans or deduplicate timestamps according to the final
covering region before interpolation. Add an assertion covering a non-grid
timestamp to verify the later region remains selected throughout the overlap.
In `@crates/compositor/src/scene.rs`:
- Around line 405-417: Add the resolved target clip identity to
SceneCursorMotionRegion, then filter cursor.motion regions by clip_index in
crates/compositor/src/timeline_walk.rs:164-165 and by active_clip_index in
crates/compositor/src/live.rs:1535-1538 before calling CursorTrack::with_motion
or regenerating the cursor track; update crates/compositor/src/scene.rs:405-417
accordingly.
In `@src/components/ai-edition/CursorMotionPathOverlay.tsx`:
- Around line 244-253: Add keyboard handling to the focusable slider control
point in CursorMotionPathOverlay, using an onKeyDown handler to adjust both cx
and cy with arrow keys while preserving valid coordinate bounds. Add
aria-valuetext that exposes the current two-dimensional control-point value
alongside the existing aria-valuenow metadata.
In `@src/components/ai-edition/NewEditorShell.tsx`:
- Around line 878-881: Update handleCopyRegion and the Ctrl+X flow so
cursor-motion selections cannot be deleted when copying is skipped: return an
explicit copy-success result from the sel.kind === "cursorMotion" branch and
only call tl.removeRegion after confirmed success, or reject cursor-motion Cut
explicitly while preserving normal copy/cut behavior for other regions.
In `@src/i18n/locales/ar/settings.json`:
- Around line 331-361: Translate the cursor-motion localization values,
preserving all keys and interpolation placeholders: update
src/i18n/locales/ar/settings.json lines 331-361 and
src/i18n/locales/ar/timeline.json lines 13-21 and 92-108 to Arabic; update
src/i18n/locales/es/settings.json lines 331-361 and
src/i18n/locales/es/timeline.json lines 13-21 and 92-108 to Spanish. Translate
the inspector strings, toolbar and empty-lane text, section labels, presets, and
status messages without changing the localization structure.
Apply the same fix in `@src/i18n/locales/pt-BR/timeline.json` at line 13.
Apply the same fix in `@src/i18n/locales/ko-KR/timeline.json` at line 13.
Apply the same fix in `@src/i18n/locales/ja-JP/timeline.json` at line 13.
Apply the same fix in `@src/i18n/locales/it/timeline.json` at line 13.
Apply the same fix in `@src/i18n/locales/it/settings.json` around lines 332 - 361:
Covers Brazilian Portuguese timeline strings.
Apply the same fix in `@src/i18n/locales/vi/settings.json` around lines 332 - 361:
Covers Traditional Chinese timeline strings.
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📒 Files selected for processing (50)
crates/compositor/src/cursor.rscrates/compositor/src/live.rscrates/compositor/src/scene.rscrates/compositor/src/timeline_walk.rssrc/components/ai-edition/CursorMotionPathOverlay.tsxsrc/components/ai-edition/NewEditorShell.tsxsrc/components/ai-edition/Preview.tsxsrc/components/ai-edition/PreviewCanvas.tsxsrc/components/ai-edition/v4/EditorShellV4.module.csssrc/components/ai-edition/v4/FloatingInspector.tsxsrc/components/ai-edition/v4/V4Timeline.geometry.test.tsxsrc/components/ai-edition/v4/V4Timeline.tsxsrc/components/ai-edition/v4/V4Timeline.waveform.test.tsxsrc/i18n/locales/ar/settings.jsonsrc/i18n/locales/ar/timeline.jsonsrc/i18n/locales/en/settings.jsonsrc/i18n/locales/en/timeline.jsonsrc/i18n/locales/es/settings.jsonsrc/i18n/locales/es/timeline.jsonsrc/i18n/locales/fr/settings.jsonsrc/i18n/locales/fr/timeline.jsonsrc/i18n/locales/it/settings.jsonsrc/i18n/locales/it/timeline.jsonsrc/i18n/locales/ja-JP/settings.jsonsrc/i18n/locales/ja-JP/timeline.jsonsrc/i18n/locales/ko-KR/settings.jsonsrc/i18n/locales/ko-KR/timeline.jsonsrc/i18n/locales/pt-BR/settings.jsonsrc/i18n/locales/pt-BR/timeline.jsonsrc/i18n/locales/ru/settings.jsonsrc/i18n/locales/ru/timeline.jsonsrc/i18n/locales/tr/settings.jsonsrc/i18n/locales/tr/timeline.jsonsrc/i18n/locales/vi/settings.jsonsrc/i18n/locales/vi/timeline.jsonsrc/i18n/locales/zh-CN/settings.jsonsrc/i18n/locales/zh-CN/timeline.jsonsrc/i18n/locales/zh-TW/settings.jsonsrc/i18n/locales/zh-TW/timeline.jsonsrc/lib/ai-edition/document/timeline.tssrc/lib/ai-edition/schema/index.tssrc/lib/ai-edition/store/documentWriteAudit.test.tssrc/lib/ai-edition/store/useTimeline.cursorMotion.test.tssrc/lib/ai-edition/store/useTimeline.tssrc/lib/ai-edition/timeline/cursorMotionRegions.test.tssrc/lib/ai-edition/timeline/cursorMotionRegions.tssrc/lib/cursor/cursorMotion.test.tssrc/lib/cursor/cursorMotion.tssrc/native/sceneDescription.test.tssrc/native/sceneDescription.ts
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The schema made the field required on AxcutDocument, but the root tsc config covers no test files, so 14 fixtures built documents without it and failed the separate "Typecheck (tests)" CI job while the root check stayed green.
… the sampler Review findings on the choreography PR, plus the two compositor semantics they hinge on: - with_motion() samples only each region's visible sub-spans (its span minus those of the regions after it in the list): the last region now wins THROUGHOUT an overlap instead of only at 240 Hz grid times, where sample_at would interpolate across the two curves between points. - SceneCursorMotionRegion carries clipIndex, emitted by sceneDescription from the document region's clipId against the scene clip order. The export walk filters regions per clip and keys its track cache by (clip, file) — two cuts of one recording keep their own regions — and the live loop filters by active_clip_index. This closes the known multi-asset gap; regions without an owner keep the historical applies-everywhere behaviour. - the preview control point is keyboard-operable (arrows nudge both coordinates, Shift = coarse step, each press a committed edit) and announces its two-dimensional position via aria-valuetext. - Ctrl+X only removes a selection whose copy actually landed on the clipboard: cursor-motion cut is refused outright (its copy always is) instead of acting as delete. - cursorMotion strings translated in the 11 locales that carried the English placeholders; placeholders and key parity verified.
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Closing as a product decision. After dogfooding the editor layer end to end and surveying the market — Screen Studio and every modern recorder ship global cursor smoothing, not path editing; Camtasia is the lone legacy exception — we are not shipping per-section cursor choreography. The pain it targets (wandering, overshoot, drift) is already mostly covered by the existing spring smoothing and cursor-follow zooms, and the auto-split, non-draggable lane costs more in coherence and long-term maintenance than it returns. Full credit to @YoneRai12 for the interaction model (#113 / #116) — the motion model and compositor halves stay on their branches if this ever returns in a simpler, global form. |
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Summary
Builds the editor half of cursor choreography on the v4 shell, and lands the two halves that were already written but never connected to anything.
Recorded cursor movement wanders on its way to a button, overshoots, then drifts while the presenter reads. This makes the path between two meaningful moments editable — a shape, a speed, a timing curve, and a handle to steer the curve on the preview — without touching the recording.
The branch carries three commits' worth of work:
00d7018f— @YoneRai12's motion model, the exact head of feat: prototype editable cursor choreography for AI Edition #116. Merging this lands that PR's content.5b744971— the compositor half fromfeat/cursor-motion-contract:SceneCursor.motionplus the sampling incrates/compositor/src/cursor.rs.51cfab86— the editor layer, new here.Related issue
Refs #548, #113, #116
Not
Fixes: #548 records open product questions and gaps this PR does not close (multi-asset ownership, GIF export, auto-split of an existing section, and whether six presets is the right number).What the editor does
The interaction model is @YoneRai12's, from #113, rebuilt rather than ported — every file that PR touches was deleted from
mainon 1 Aug when the v4 editor became the only editor. Two faults in it are fixed rather than reproduced: the panel had no label for therecordedpreset, so the first button in the grid rendered blank, and the speed help text described a leading pause its own code comment says was reverted for looking broken.Design decisions worth reviewing
Creating a region changes nothing. New sections are born
recordedat 1x. Projects that never open the feature render exactly as they do today.A pause is a section, not a stretch of path. Rests become Hold sections that stay put. One continuous curve across a two-second pause makes the cursor drift while the presenter is deliberately holding still.
Speed reshapes progress, it does not retime. A section always ends on the recorded click at its original timestamp.
The lane does not coalesce and does not drag. Unlike every other lane: two touching sections with the same preset are still two sections, and being individually selectable is the feature — which is the state a fresh auto-split is always in. Their boundaries are anchors the recording placed, not a span to stretch, so the resize handles are gone and dragging is refused.
sceneDescriptionemits the SOURCE span, deliberately not projected the way zoom and annotation regions are: the compositor applies these once to the cursor track, which is already loaded in that clock.Known gaps
Scene.cursor.motioncarries no owner, so in a project whose clips draw on two different recordings the second one's regions land on the first one's track. Commented at the site; the fix belongs in the contract, besideresolve_scene_clip_index.Type of change
Release impact
cursorMotionRegionsis additive with a[]default, mirroring howannotationsandzoomRangeslanded at v3 — old projects load unchanged and no schema version bump is needed.Desktop impact
Screenshots / video
Not attached yet. The editor layer was driven in the v4 browser preview (
vite.v4preview.config.ts) against a seeded project: the lane rendering six sections, the inspector round-tripping a preset change into the pill label, the Hold section replacing the preset grid with its own copy, and a control-point drag reshaping the path and persisting. A recording against real footage should follow once the compositor addon is rebuilt.Testing
npx tsc --noEmit— cleannpx vitest run src/lib/ai-edition src/native src/lib/cursor src/components/ai-edition— 86 files, 1082 tests passing, of which 23 are newnpm run i18n:check— passes, all 12 locales match en across 7 namespacesnpx biome checkon the touched trees — cleanNew coverage: the document↔model bridge (seconds/milliseconds, the control point as an absolute position,
recordedstaying inert, speed advancing further without moving the end anchor), the store actions (split at rests and clicks, sections created inert, one write per auto-split, refusal with no following click, apply-to-all skipping holds and not copying the control point, split sampling the curve so both halves meet where the cursor passed), and the scene emit (source span, resolved geometry, empty list for untouched projects).Writing those tests found a real defect:
tscdoes not cover test files, so a document built without the new field compiles and then crashes at runtime — which is exactly what broke the timeline tests first. The reads are defensive now.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes