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feat: add stacked timeline tracks for annotations - #1243
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Check name Status Explanation Title check The title clearly and concisely describes the main change: adding stacked timeline tracks for annotations. Description check The description is complete and follows the repository template. It explains the change, issue context, change types, release impact, platform impact, visual evidence, and detailed testing results. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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EtienneLescot
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Thanks @aiden-guan, this is careful work: the one-undo-step layer change, the identical-overlap handling and the clip-boundary edge case are all well thought out, and the export order matches what the timeline shows.
One thing needs to change before we can merge. A track is currently one layer, and every annotation already has its own layer: addAnnotation uses max + 1, and existing projects were saved with length + 1. So every annotation gets its own track, overlapping or not. Ten back-to-back annotations make ten tracks, and an existing project opens with its panel grown to the height limit. We'd like tracks to come from overlaps: an annotation sits on the highest free track below every higher-layer annotation it overlaps, and zIndex only orders overlapping ones. Vertical drag then means "above / below the annotations I overlap at the drop position" rather than "onto layer N".
Smaller points:
- Please keep the stacking to the annotation lane. Speed, trim, zoom, camera and effect regions repel each other and never overlap, and with the compact-handle padding their lanes now gain or lose a row as the timeline is zoomed (
regionTracks.ts:32,laneStyle). NewEditorShellcomputes the row count withoutpxPerSecorstackOrder, so its height can disagree with whatV4Timelinedraws.electron/ai-edition/agent-tools.ts:3169(the MCPaddAnnotation) still usesannotations.length + 1. Please switch it to the samemax + 1, or it can create duplicate layers.- When two tracks share a layer, dragging down onto the lower one lands the annotation above it (
useTimeline.ts:995,V4Timeline.tsx:1110). replacePillSpanandcoalesceRegionsForRulerdetect annotations by the presence ofzIndex. An explicit option would be safer if another region kind ever gets one.- The
dragHinttitle also shows on the empty lane; putting it on the pills would be enough. - Minor perf:
stackOrderdoes afindIndexper id (a Map would do), andpackRegionRowsruns twice per lane per render, including on every pointer move during a drag.
Also, the branch has two merge commits from main. We merge by rebase only, so please rebase onto main instead.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/components/ai-edition/NewEditorShell.tsx:
- Around line 257-262: Update startTimelineResize to adjust the saved base
height by the pointer-driven rendered-height delta from drag start, using
timelineBaseHeightPx and timelineHeightPx as the starting values. Clamp the
resulting base between MIN_TIMELINE_HEIGHT_PX and MAX_TIMELINE_HEIGHT_PX, and
keep the existing pointer-release handling unchanged so annotation expansion
cannot reduce the saved base height.
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⛔ Files ignored due to path filters: 1
technical-documentation/assets/annotation-tracks.pngis excluded by!**/*.png
📒 Files selected for processing: 15
electron/ai-edition/agent-tools.test.tselectron/ai-edition/agent-tools.tssrc/components/ai-edition/NewEditorShell.timelineHeight.test.tsxsrc/components/ai-edition/NewEditorShell.tsxsrc/components/ai-edition/v4/V4Timeline.geometry.test.tsxsrc/components/ai-edition/v4/V4Timeline.tsxsrc/lib/ai-edition/document/timeline.tssrc/lib/ai-edition/store/useTimeline.test.tssrc/lib/ai-edition/store/useTimeline.tssrc/lib/ai-edition/timeline/regionTracks.test.tssrc/lib/ai-edition/timeline/regionTracks.tssrc/lib/ai-edition/timeline/timelineMap.test.tssrc/lib/ai-edition/timeline/timelineMap.tstechnical-documentation/architecture/timeline-model.mdtests/e2e/v4-shell.spec.ts
🚧 Files skipped from review as they are similar to previous changes: 1
- src/components/ai-edition/v4/V4Timeline.geometry.test.tsx
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Thanks for the update, this addresses the 19/10 review. I built the website locally on this head (the recreation check reads One thing before merge: the open CodeRabbit thread on |
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Summary
Overlapping annotations can hide one another in the timeline. Add independent annotation tracks that keep every object selectable, movable, resizable and deletable, including identical overlaps and clip-boundary fragments.
Tracks come from time overlaps: each annotation takes the highest free row below every higher annotation it overlaps. Nonoverlapping annotations reuse rows regardless of saved
zIndex, so ten sequential annotations stay on one row. Vertical dragging places an annotation above or below the annotations it overlaps at the drop time, including shared-layer projects; span and compositing order save together as one undo step.Stacking is limited to annotations. Speed, trim, zoom, camera and effect regions retain their single lanes and repulsion rules. Track geometry is independent of zoom, and the timeline reports its exact live row count to the shell. Pill operations opt into annotation behavior explicitly; both editor and MCP additions use the highest saved layer plus one. Includes memoized layout, translated pill drag hints, architecture documentation and regression coverage.
Related issue
No linked issue. Reproduces a full-length annotation with shorter overlapping annotations.
Type of change
Release impact
Desktop impact
Screenshots / video
Testing
Verified locally on macOS. Tests, typechecks, build and browser checks used Node 22.22.1:
npm run test -- --maxWorkers=2— 355 files passed; 4,952 tests passed, 2 skippednpm run build-vitenpx tsc -p tsconfig.test.json --noEmitnpm run lint:fixandnpm run lint(existing warnings, no errors)npm run i18n:checkandnpm run docs:checktests/e2e/v4-shell.spec.tsandtests/e2e/editor-smoke.spec.ts— 10 passedRegression coverage includes sequential row reuse, overlap-order chains, equal-layer downward drops, horizontal drop positions, independent annotation identity, explicit annotation options, MCP layer allocation, live panel sizing, persistence and one-step undo/redo. Browser coverage includes pointer dragging with shared layers, undo/redo and row stability while zooming.
Native capture, GPU preview/export and packaged installers were not exercised. The branch is rebased onto
mainwith no merge commits.Summary by CodeRabbit