docs(08-03): complete renderTrackRow optimization plan
- SUMMARY.md with classMap directive migration results - STATE.md updated: 3/4 plans complete, decisions recorded - ROADMAP.md updated with plan progress
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@@ -3,12 +3,12 @@ gsd_state_version: 1.0
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milestone: v1.0
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milestone_name: milestone
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status: in-progress
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last_updated: "2026-03-05T04:17:06Z"
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last_updated: "2026-03-05T04:22:19Z"
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progress:
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total_phases: 8
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completed_phases: 7
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total_plans: 17
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completed_plans: 15
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completed_plans: 16
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---
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# YellowJacket — Consolidation Milestone State
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@@ -16,17 +16,17 @@ progress:
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## Project Reference
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**Core value:** The music player works reliably and feels solid — every interaction is correct, responsive, and trustworthy.
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**Current focus:** Phase 8 in progress — Plans 01-02 complete. Virtualizer repeat() migration done. Continuing with frontend polish.
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**Current focus:** Phase 8 in progress — Plans 01-03 complete. renderTrackRow/renderTrackItem optimized with classMap. One plan remaining.
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**Milestone:** Consolidation (correctness, performance, code quality, UX polish, test coverage)
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## Current Position
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**Phase:** 08-frontend-performance-ux
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**Plan:** 2/4 (Plans 01-02 complete)
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**Plan:** 3/4 (Plans 01-03 complete)
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**Status:** In progress
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```
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Phase Progress: [########] 8/8 phases — Phase 8: 2/4 plans complete
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Phase Progress: [########] 8/8 phases — Phase 8: 3/4 plans complete
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```
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## Performance Metrics
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@@ -34,7 +34,7 @@ Phase Progress: [########] 8/8 phases — Phase 8: 2/4 plans complete
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| Metric | Value |
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|--------|-------|
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| Phases complete | 7/8 |
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| Plans complete | 2/4 (Phase 8) |
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| Plans complete | 3/4 (Phase 8) |
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| Requirements delivered | 22/26 |
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| Tests added | 84 |
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| Bugs fixed | 9 |
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@@ -55,6 +55,7 @@ Phase Progress: [########] 8/8 phases — Phase 8: 2/4 plans complete
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| Phase 07 P02 | 1 min | 1 tasks | 1 files |
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| Phase 08 P01 | 1 min | 2 tasks | 3 files |
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| Phase 08 P02 | 3 min | 2 tasks | 5 files |
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| Phase 08 P03 | 2 min | 2 tasks | 2 files |
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## Accumulated Context
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@@ -90,6 +91,8 @@ Phase Progress: [########] 8/8 phases — Phase 8: 2/4 plans complete
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| 150ms search debounce with instant clear | Balances responsiveness with computation cost; empty clears are immediate for snappy UX | Phase 8 |
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| :host scoped design tokens | Component-level token scope matches Lit's shadow DOM encapsulation model | Phase 8 |
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| Inline repeat() keys over gridKeyFunction | Dead method removal; key logic is cleaner inline in repeat() calls | Phase 8 |
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| classMap over array filter/join | Eliminates per-row array allocation; classMap diffs internally for efficient DOM updates | Phase 8 |
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| Hoist search term outside cols.map | Avoids redundant property access per column per row in render hot path | Phase 8 |
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### TODOs
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@@ -133,18 +136,18 @@ None currently.
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### Last Session
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**Date:** 2026-03-05
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**What happened:** Executed Phase 8 Plan 02 — virtualizer repeat() directive migration
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**Where we stopped:** Completed 08-02-PLAN.md (2 tasks, all verification passed). Phase 8: 2/4 plans complete.
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**Next action:** Execute Phase 8 Plan 03
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**What happened:** Executed Phase 8 Plan 03 — renderTrackRow/renderTrackItem optimization with classMap
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**Where we stopped:** Completed 08-03-PLAN.md (2 tasks, all verification passed). Phase 8: 3/4 plans complete.
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**Next action:** Execute Phase 8 Plan 04
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### Context for Next Session
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- Phase 8 Plans 01-02 complete
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- All 7 lit-virtualizer instances now use repeat() with stable entity keys
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- DOM recycling enabled for scrolling/filtering in large libraries
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- 2 plans remaining in Phase 8
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- Phase 8 Plans 01-03 complete
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- classMap directive used in all render hot paths (track-list + queue-panel)
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- Search highlight short-circuits when term is empty
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- 1 plan remaining in Phase 8
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---
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*State initialized: 2026-02-27*
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Last activity: 2026-03-05 - Completed 08-02: virtualizer repeat() directive migration
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Last activity: 2026-03-05 - Completed 08-03: renderTrackRow classMap optimization
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*Last updated: 2026-03-05*
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@@ -0,0 +1,95 @@
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---
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phase: 08-frontend-performance-ux
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plan: 03
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subsystem: frontend
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tags: [lit, classMap, performance, render-optimization, directives]
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# Dependency graph
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requires:
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- phase: 08-frontend-performance-ux
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provides: "repeat() directive migration on all virtualizer instances"
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provides:
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- "classMap directive for conditional CSS classes in track-list renderTrackRow and queue-panel renderTrackItem"
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- "Search highlight short-circuit when search term is empty"
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- "Hoisted search term lookup outside per-column iteration loop"
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affects: [08-frontend-performance-ux]
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# Tech tracking
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tech-stack:
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added: []
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patterns: ["classMap directive for conditional CSS classes in render hot paths"]
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key-files:
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created: []
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modified:
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- frontend/src/components/track-list/track-list.ts
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- frontend/src/components/queue-panel/queue-panel.ts
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key-decisions:
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- "classMap object literal per-call is acceptable — classMap internally diffs and only updates changed classes"
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- "Hoisted searchCtrl.term outside cols.map to avoid repeated property access per column"
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patterns-established:
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- "Render hot path pattern: use classMap directive instead of array filter/join for conditional CSS classes"
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requirements-completed: [PERF-05, UX-02]
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# Metrics
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duration: 2min
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completed: 2026-03-05
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---
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# Phase 8 Plan 03: renderTrackRow Optimization Summary
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**Replaced array filter/join class construction with classMap directive in track-list and queue-panel render hot paths, eliminating per-row array allocations during scrolling**
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## Performance
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- **Duration:** 2 min
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- **Started:** 2026-03-05T04:19:55Z
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- **Completed:** 2026-03-05T04:22:19Z
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- **Tasks:** 2
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- **Files modified:** 2
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## Accomplishments
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- All conditional CSS class construction in renderTrackRow (track-row, fav-icon, cell) converted from array filter/join to classMap directive
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- Queue-panel renderTrackItem class construction (track-item, active, selected, drop-before, drop-after) converted to classMap
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- Search term property lookup hoisted outside per-column loop to avoid repeated access
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- Search highlighting already short-circuits when term is empty — no additional optimization needed
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Replace class string construction with classMap directive in renderTrackRow** - `ad21027` (perf)
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2. **Task 2: Optimize column value computation and apply classMap to queue-panel renderTrackItem** - `62f41c2` (perf)
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## Files Created/Modified
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- `frontend/src/components/track-list/track-list.ts` - classMap for track-row, fav-icon, and cell classes; hoisted search term lookup
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- `frontend/src/components/queue-panel/queue-panel.ts` - classMap for track-item with active, selected, drop-before, drop-after states
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## Decisions Made
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- classMap object literal allocation per-call is acceptable since classMap internally diffs previous values and only applies DOM changes for actually changed classes — net benefit over string concatenation in Lit's update cycle
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- Hoisted searchCtrl.term outside the cols.map loop — avoids redundant property access per column per row
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- All render hot path optimizations complete for track-list and queue-panel
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- Ready for Plan 04 (final phase 8 plan)
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## Self-Check: PASSED
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All key files exist on disk. All task commits verified in git history.
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---
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*Phase: 08-frontend-performance-ux*
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*Completed: 2026-03-05*
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