118 lines
4.8 KiB
Markdown
118 lines
4.8 KiB
Markdown
---
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phase: 08-frontend-performance-ux
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plan: 02
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subsystem: ui
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tags: [lit, virtualizer, repeat-directive, dom-recycling, performance]
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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: "Phase context with virtualizer component analysis"
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provides:
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- "All 7 lit-virtualizer instances use repeat() with stable keys for efficient DOM reuse"
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- "Keyed rendering: FilePath (tracks), album.ID (covers), QueueTrack.id (queue), artist.ID (artists), genre.name (genres)"
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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: ["repeat() directive with stable keys on all lit-virtualizer instances"]
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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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- frontend/src/components/cover-grid/cover-grid.ts
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- frontend/src/components/artists-view/artists-view.ts
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- frontend/src/components/genres-view/genres-view.ts
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key-decisions:
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- "Inline album.ID key in repeat() calls instead of keeping gridKeyFunction method"
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- "Use genre.name (lowercase) as key matching Genre interface, not genre.Name from plan"
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patterns-established:
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- "Virtualizer pattern: always use repeat() with stable entity key as child of lit-virtualizer, keep .items for sizing"
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requirements-completed: [PERF-05, UX-02]
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# Metrics
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duration: 3min
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completed: 2026-03-05
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---
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# Phase 8 Plan 02: Virtualizer repeat() Directive Migration Summary
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**Migrated all 7 lit-virtualizer instances across 5 components to repeat() directive with stable entity keys for efficient DOM recycling during scrolling and filtering**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-03-05T04:13:34Z
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- **Completed:** 2026-03-05T04:17:06Z
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- **Tasks:** 2
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- **Files modified:** 5
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## Accomplishments
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- All 7 virtualizer instances now use repeat() with stable keys for DOM node reuse
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- Removed .renderItem and .keyFunction properties from all lit-virtualizer elements
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- Removed dead gridKeyFunction method from cover-grid component
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- Stable keys: FilePath (tracks), QueueTrack.id (queue), album.ID (covers), artist.ID (artists), genre.name (genres)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Migrate track-list and queue-panel virtualizers** - `d2d7d8c` (perf)
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2. **Task 2: Migrate cover-grid, artists-view, and genres-view virtualizers** - `1c3514d` (perf)
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## Files Created/Modified
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- `frontend/src/components/track-list/track-list.ts` - repeat() with FilePath key for track virtualizer
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- `frontend/src/components/queue-panel/queue-panel.ts` - repeat() with QueueTrack.id key for queue virtualizer
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- `frontend/src/components/cover-grid/cover-grid.ts` - repeat() with album.ID key for all 3 cover grid virtualizers, removed gridKeyFunction
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- `frontend/src/components/artists-view/artists-view.ts` - repeat() with artist.ID key
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- `frontend/src/components/genres-view/genres-view.ts` - repeat() with genre.name key
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## Decisions Made
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- **Inlined album.ID key instead of keeping gridKeyFunction:** The gridKeyFunction method was only used for .keyFunction property bindings. Since repeat() takes an inline key function, the method became dead code and was removed for cleanliness.
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- **Used genre.name (lowercase) not genre.Name:** The Genre interface in genres-view uses lowercase `name` field, not the Go-model-style `Name`. Plan referenced `genre.Name` but actual code uses `genre.name`.
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed renderGridEntry call signature in cover-grid repeat()**
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- **Found during:** Task 2 (cover-grid migration)
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- **Issue:** Plan template used `(entry, index) => this.renderGridEntry(entry, index)` but renderGridEntry only accepts 1 argument (GridEntry), not 2
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- **Fix:** Changed to `(entry) => this.renderGridEntry(entry)` for all 3 cover-grid virtualizers
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- **Files modified:** frontend/src/components/cover-grid/cover-grid.ts
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- **Verification:** TypeScript compiles without errors
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- **Committed in:** 1c3514d (Task 2 commit)
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**2. [Rule 1 - Bug] Corrected genre key from genre.Name to genre.name**
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- **Found during:** Task 2 (genres-view migration)
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- **Issue:** Plan specified `entry.genre.Name` but Genre interface uses lowercase `name` field
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- **Fix:** Used `entry.genre.name` as the repeat() key
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- **Files modified:** frontend/src/components/genres-view/genres-view.ts
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- **Verification:** TypeScript compiles without errors
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- **Committed in:** 1c3514d (Task 2 commit)
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---
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**Total deviations:** 2 auto-fixed (2 bugs)
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**Impact on plan:** Both fixes necessary for TypeScript correctness. No scope creep.
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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 virtualizer components now use repeat() with stable keys
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- Ready for remaining Phase 8 plans (08-03, 08-04)
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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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