yonlu
bc487cd715
- SUMMARY.md with classMap directive migration results - STATE.md updated: 3/4 plans complete, decisions recorded - ROADMAP.md updated with plan progress
96 lines
3.5 KiB
Markdown
96 lines
3.5 KiB
Markdown
---
|
|
phase: 08-frontend-performance-ux
|
|
plan: 03
|
|
subsystem: frontend
|
|
tags: [lit, classMap, performance, render-optimization, directives]
|
|
|
|
# Dependency graph
|
|
requires:
|
|
- phase: 08-frontend-performance-ux
|
|
provides: "repeat() directive migration on all virtualizer instances"
|
|
provides:
|
|
- "classMap directive for conditional CSS classes in track-list renderTrackRow and queue-panel renderTrackItem"
|
|
- "Search highlight short-circuit when search term is empty"
|
|
- "Hoisted search term lookup outside per-column iteration loop"
|
|
affects: [08-frontend-performance-ux]
|
|
|
|
# Tech tracking
|
|
tech-stack:
|
|
added: []
|
|
patterns: ["classMap directive for conditional CSS classes in render hot paths"]
|
|
|
|
key-files:
|
|
created: []
|
|
modified:
|
|
- frontend/src/components/track-list/track-list.ts
|
|
- frontend/src/components/queue-panel/queue-panel.ts
|
|
|
|
key-decisions:
|
|
- "classMap object literal per-call is acceptable — classMap internally diffs and only updates changed classes"
|
|
- "Hoisted searchCtrl.term outside cols.map to avoid repeated property access per column"
|
|
|
|
patterns-established:
|
|
- "Render hot path pattern: use classMap directive instead of array filter/join for conditional CSS classes"
|
|
|
|
requirements-completed: [PERF-05, UX-02]
|
|
|
|
# Metrics
|
|
duration: 2min
|
|
completed: 2026-03-05
|
|
---
|
|
|
|
# Phase 8 Plan 03: renderTrackRow Optimization Summary
|
|
|
|
**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**
|
|
|
|
## Performance
|
|
|
|
- **Duration:** 2 min
|
|
- **Started:** 2026-03-05T04:19:55Z
|
|
- **Completed:** 2026-03-05T04:22:19Z
|
|
- **Tasks:** 2
|
|
- **Files modified:** 2
|
|
|
|
## Accomplishments
|
|
- All conditional CSS class construction in renderTrackRow (track-row, fav-icon, cell) converted from array filter/join to classMap directive
|
|
- Queue-panel renderTrackItem class construction (track-item, active, selected, drop-before, drop-after) converted to classMap
|
|
- Search term property lookup hoisted outside per-column loop to avoid repeated access
|
|
- Search highlighting already short-circuits when term is empty — no additional optimization needed
|
|
|
|
## Task Commits
|
|
|
|
Each task was committed atomically:
|
|
|
|
1. **Task 1: Replace class string construction with classMap directive in renderTrackRow** - `ad21027` (perf)
|
|
2. **Task 2: Optimize column value computation and apply classMap to queue-panel renderTrackItem** - `62f41c2` (perf)
|
|
|
|
## Files Created/Modified
|
|
- `frontend/src/components/track-list/track-list.ts` - classMap for track-row, fav-icon, and cell classes; hoisted search term lookup
|
|
- `frontend/src/components/queue-panel/queue-panel.ts` - classMap for track-item with active, selected, drop-before, drop-after states
|
|
|
|
## Decisions Made
|
|
- 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
|
|
- Hoisted searchCtrl.term outside the cols.map loop — avoids redundant property access per column per row
|
|
|
|
## Deviations from Plan
|
|
|
|
None - plan executed exactly as written.
|
|
|
|
## Issues Encountered
|
|
None
|
|
|
|
## User Setup Required
|
|
None - no external service configuration required.
|
|
|
|
## Next Phase Readiness
|
|
- All render hot path optimizations complete for track-list and queue-panel
|
|
- Ready for Plan 04 (final phase 8 plan)
|
|
|
|
## Self-Check: PASSED
|
|
|
|
All key files exist on disk. All task commits verified in git history.
|
|
|
|
---
|
|
*Phase: 08-frontend-performance-ux*
|
|
*Completed: 2026-03-05*
|