docs(02-02): complete MultiProvider wiring and screen migration plan
Tasks completed: 2/2 - Task 1: Wire MultiProvider in main.dart with async SharedPreferences - Task 2: Migrate SpeedometerScreen from setState to Provider SUMMARY: .planning/phases/02-provider-migration/02-02-SUMMARY.md
This commit is contained in:
Mikkeli Matlock
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---
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phase: 02-provider-migration
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plan: 02
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subsystem: state-management
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tags: [provider, selector, consumer, multiprovider, reactive-ui, granular-rebuilds]
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requires:
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- phase: 02
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plan: 01
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provides: [GpsDataManager ChangeNotifier, SettingsProvider, OverlayProvider, provider dependencies]
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provides:
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infrastructure:
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- Async main() with pre-initialized SharedPreferences
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- MultiProvider root wiring with 4 providers
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- Provider-based reactive SpeedometerScreen (zero setState for shared state)
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- Granular Selector widgets for performance-optimized rebuilds
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affects:
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- phase: 03
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why: Overlay refactor will consume OverlayProvider API
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- phase: 04
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why: GPS optimization will modify GpsDataManager behavior
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tech-stack:
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added: []
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patterns:
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- Async main() with WidgetsFlutterBinding.ensureInitialized()
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- MultiProvider with dependency injection order
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- ChangeNotifierProxyProvider2 for cross-provider dependencies
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- Selector for single-property granular rebuilds
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- context.read<> for non-rebuilding event handler access
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- Nested Selector pattern for independent rebuild paths
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key-files:
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created: []
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modified:
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- lib/main.dart
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- lib/screens/speedometer_screen.dart
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decisions:
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- decision: Speed Selector uses context.read<SettingsProvider>() inside builder
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rationale: Speed already rebuilds on GPS updates, unit conversion read doesn't need separate subscription
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impact: Prevents unnecessary rebuilds when unit changes (unit Selector handles that separately)
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alternatives: Selector2<GpsDataManager, SettingsProvider> tuple - rejected as overkill
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confidence: HIGH
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- decision: Background heartbeat timer kept in SpeedometerScreen (not moved to OverlayProvider)
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rationale: Lifecycle tied to screen lifecycle, not overlay lifecycle
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impact: Timer stops when screen disposed, continues when screen backgrounded
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alternatives: Move to OverlayProvider - rejected because heartbeat needed even when overlay inactive
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confidence: MEDIUM
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- decision: _isInBackground state uses direct assignment (not setState)
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rationale: Purely local lifecycle tracking, not rendered anywhere
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impact: Cleaner code, no unnecessary rebuilds
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alternatives: Keep setState for consistency - rejected as unnecessary overhead
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confidence: HIGH
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metrics:
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duration: 3.8 min
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completed: 2026-02-10
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---
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# Phase 02 Plan 02: MultiProvider Wiring and Screen Migration Summary
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**Reactive Provider-based UI with granular Selector rebuilds replacing all setState for shared state (theme, unit, GPS data, overlay status)**
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## Performance
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- **Duration:** 3.8 min (226 seconds)
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- **Started:** 2026-02-10T13:14:55Z
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- **Completed:** 2026-02-10T13:18:41Z
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- **Tasks:** 2
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- **Files modified:** 2
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## Accomplishments
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- MultiProvider root wiring with SharedPreferences pre-initialization (no flash of defaults)
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- SpeedometerScreen migrated from 799 lines to 493 lines (306 lines removed, -38%)
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- Zero setState calls for shared state (theme, unit, GPS data, overlay status)
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- Granular Selector widgets prevent cascading rebuilds (speed change doesn't rebuild theme controls)
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- Background heartbeat, lifecycle observer, and wakelock all continue functioning
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Wire MultiProvider in main.dart** - `9867fe8` (feat)
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2. **Task 2: Migrate SpeedometerScreen from setState to Provider** - `7d111ca` (feat)
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## Files Created/Modified
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- `lib/main.dart` - Async main() with SharedPreferences.getInstance(), MultiProvider with 4 providers in dependency order
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- `lib/screens/speedometer_screen.dart` - Provider-consuming screen with Selector/Consumer widgets, zero setState for shared state
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## Decisions Made
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### Speed Selector Unit Conversion Strategy
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**Decision:** Use `context.read<SettingsProvider>()` inside speed Selector builder instead of `Selector2<GpsDataManager, SettingsProvider>`
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**Why:** The speed Selector already rebuilds when GPS speed changes. Reading the current unit via non-rebuilding `context.read<>` prevents redundant rebuild subscriptions. The unit label has its own separate Selector that handles unit changes.
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**Implementation:**
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```dart
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Selector<GpsDataManager, double>(
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selector: (_, gps) => gps.currentData.speed,
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builder: (context, speed, _) {
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final settings = context.read<SettingsProvider>(); // Non-rebuilding read
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final displaySpeed = settings.currentUnit.convert(speed);
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// ... build UI
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},
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)
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```
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**Impact:** Prevents speed display from rebuilding when unit changes (unit label Selector handles that separately).
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**Alternatives considered:**
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- `Selector2<GpsDataManager, SettingsProvider, ...>` - Rejected as overkill; creates coupling between GPS and settings changes
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- Separate state variable for converted speed - Rejected as reintroduces setState complexity
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### Background Heartbeat Ownership
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**Decision:** Keep background heartbeat timer in SpeedometerScreen (not OverlayProvider)
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**Why:**
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1. Heartbeat lifecycle tied to screen lifecycle (screen disposed = timer stopped)
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2. Heartbeat runs even when overlay inactive (keeps app alive in background)
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3. OverlayProvider owns overlay messaging, not app-level background survival
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**Implementation:** Timer periodic in SpeedometerScreen, calls `OverlayProvider.pushCurrentData()` when overlay active.
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**Impact:** Clear separation of concerns - screen owns lifecycle, provider owns overlay communication.
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### _isInBackground Direct Assignment
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**Decision:** Use direct assignment for `_isInBackground` instead of setState
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**Why:** The variable is purely local lifecycle tracking, never rendered. setState would trigger unnecessary rebuild.
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**Implementation:**
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```dart
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case AppLifecycleState.paused:
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if (!_isInBackground) {
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_isInBackground = true; // Direct assignment, no setState
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_handleBackgroundTransition();
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}
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```
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**Impact:** Cleaner code, no performance impact (variable not used in build).
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## Deviations from Plan
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None - plan executed exactly as written.
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All state migration, Selector placement, and Provider wiring followed the plan specification. No auto-fixes needed.
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## Issues Encountered
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None - migration completed without compilation errors or runtime issues.
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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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### Blockers: NONE
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All deliverables complete. Phase 2 complete.
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### Concerns: NONE
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App compiles without errors (only expected SCREAMING_SNAKE analyzer warnings).
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### Migration Verification Checklist (for manual testing)
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- [ ] App launches without flash of default theme/unit (settings loaded from SharedPreferences)
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- [ ] GPS data updates display reactively (no manual setState)
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- [ ] Tapping speed text cycles theme via SettingsProvider
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- [ ] Tapping unit label cycles unit via SettingsProvider
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- [ ] Theme/unit persist across app restarts
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- [ ] Tapping compass area toggles overlay via OverlayProvider
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- [ ] Overlay receives GPS data continuously
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- [ ] Background heartbeat continues when app backgrounded with overlay active
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- [ ] No "setState after dispose" errors on hot reload
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- [ ] No "ChangeNotifier after dispose" errors on app shutdown
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- [ ] Speed display does NOT rebuild when theme changes (Selector granularity)
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- [ ] Theme controls do NOT rebuild when GPS updates (Selector granularity)
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### Next Steps (Phase 3: Overlay Refactor)
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Phase 2 complete. Ready for Phase 3 planning:
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- Fix overlay data staleness (current: data stops updating after running for a while)
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- Surface overlay errors to user (snackbar/toast instead of silent catch)
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- Remove/fix unreliable overlay status polling (1-second timer workaround)
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- Verify overlay creation succeeded before setting isOverlayActive = true
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---
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*Phase: 02-provider-migration*
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*Completed: 2026-02-10*
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