yonlu
f9cb346751
- Created 14-02-SUMMARY.md with execution results - Updated STATE.md with Phase 14 position and decisions - Updated ROADMAP.md progress for Phase 14 (1/4 plans)
100 lines
3.9 KiB
Markdown
100 lines
3.9 KiB
Markdown
---
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phase: 14-performance-optimization
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plan: 02
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subsystem: ui
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tags: [navigation, view-caching, dom, performance, display-toggle]
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# Dependency graph
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requires: []
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provides:
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- View caching navigation system — primary views created once and visibility-toggled
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- viewCache Map with bounded 6-entry cache for primary views
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- Ephemeral detail view lifecycle (artist-details, playlist-details, genre-details)
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affects: [14-performance-optimization]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "View cache Map<string, HTMLElement> for DOM-persistent primary views"
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- "display:none/display:'' toggle instead of innerHTML destruction"
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- "Ephemeral detail views (remove + create) vs cached primary views"
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key-files:
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created: []
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modified:
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- frontend/index.ts
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key-decisions:
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- "Primary views cached, detail views ephemeral — detail views depend on entity IDs that change per navigation"
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- "Inline style.display toggle over CSS class — simpler, no specificity issues, direct JS control"
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- "viewCache bounded at 6 entries (one per primary view) — negligible memory overhead"
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patterns-established:
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- "View caching: create once, toggle visibility, never destroy primary views"
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- "Detail view lifecycle: hide primary view, remove old detail, create new detail"
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requirements-completed: [PERF-NAV-01, PERF-NAV-02]
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# Metrics
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duration: 1min
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completed: 2026-03-14
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---
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# Phase 14 Plan 02: View Caching Navigation Summary
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**DOM-persistent view cache replacing innerHTML destruction — primary views created once and visibility-toggled for instant navigation**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-03-14T17:43:20Z
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- **Completed:** 2026-03-14T17:44:52Z
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- **Tasks:** 1
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- **Files modified:** 1
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## Accomplishments
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- Replaced innerHTML-based navigation with a view caching system using a `Map<string, HTMLElement>`
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- Primary views (tracks, albums, artists, genres, playlists, settings) created once and kept in DOM
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- Navigation toggles `display:none` / `display:''` instead of destroying and recreating components
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- Detail views (artist-details, playlist-details, genre-details) remain ephemeral with proper lifecycle (remove old, create new)
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- Scroll positions naturally preserved since DOM is never destroyed
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- No virtualizer reinit, no data refetch, no cover art image reload on navigation
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Implement view caching navigation system** - `ad91043` (perf)
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## Files Created/Modified
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- `frontend/index.ts` - Replaced switch/innerHTML navigation with VIEW_TAGS map, viewCache Map, display toggle, and ephemeral detail view lifecycle
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## Decisions Made
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- **Primary views cached, detail views ephemeral** — Detail views (artist-details, playlist-details, genre-details) depend on entity IDs/names that change per navigation, so caching them would show stale content. Primary views are stateless navigation targets that benefit from persistence.
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- **Inline style.display toggle** — Using `element.style.display = 'none'` / `element.style.display = ''` rather than CSS classes avoids specificity issues and gives direct control. The empty string restores the element's natural display value from CSS (`.main-panel > * { height: 100% }`).
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- **viewCache bounded at 6 entries** — One entry per primary view tag in VIEW_TAGS. Memory overhead is negligible since the data each view holds is already in store caches regardless.
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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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- View caching complete — ready for remaining Phase 14 plans (14-01 CSS containment, 14-03 store optimizations, 14-04 rendering optimizations)
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- Existing scroll save/restore logic in components preserved as fallback for data invalidation scenarios
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---
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## Self-Check: PASSED
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- ✅ frontend/index.ts exists
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- ✅ Commit ad91043 exists
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*Phase: 14-performance-optimization*
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*Completed: 2026-03-14*
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