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gps-speedo/.planning/phases/04-gps-power-optimization/04-02-SUMMARY.md
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Mikkeli Matlock 177e13a2f8 docs(04-02): complete UI integration plan 
- Created 04-02-SUMMARY.md with execution details
- Updated STATE.md progress (Phase 4: 2/2 complete)
- Updated performance metrics (8 plans, 5.5 min avg)
- Added key decisions to accumulated context
- Marked Phase 4 as complete
2026-02-12 09:12:43 +09:00

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phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, duration, completed
phase plan subsystem tags requires provides affects tech-stack key-files key-decisions duration completed
04-gps-power-optimization 02 ui
staleness
lifecycle
overlay
provider-wiring
phase provides
04-gps-power-optimization Lifecycle-aware GpsDataManager, ProcessedGpsData with timestamp
Main app staleness detection matching overlay (3s dim, 10s dashes)
Centralized wake lock (removed from SpeedometerScreen)
Centralized lifecycle management (removed from SpeedometerScreen)
Clean OverlayProvider without Phase 3 placeholder
GpsDataManager overlay reference wiring
added patterns
staleness detection via timestamp
centralized lifecycle in manager
created modified
lib/screens/speedometer_screen.dart
lib/providers/overlay_provider.dart
Staleness detection uses same thresholds as overlay for consistency (3s dim, 10s dash)
Background heartbeat simplified to check only overlay state (removed _isInBackground)
Haptic feedback added to theme/unit cycling for better tactile response
GPS_GRACE_PERIOD kept in TimingConfig as deprecated (unused but documented)
3.35min 2026-02-12

Phase 4 Plan 02: UI Integration Summary

Main app staleness detection, centralized lifecycle management, and clean provider architecture

Performance

  • Duration: 3.35 minutes
  • Start: 2026-02-12 08:33:41 UTC
  • End: 2026-02-12 08:37:02 UTC
  • Tasks completed: 2
  • Files modified: 2
  • Commits: 2

Accomplishments

Successfully integrated the lifecycle-aware GPS engine into the UI layer and cleaned up architectural responsibilities:

  1. Staleness Detection in Main App

    • Added staleness check timer (1s interval) to SpeedometerScreen
    • Speed/heading displays dim at 3s, show dashes at 10s (identical to overlay)
    • Staleness calculated from ProcessedGpsData.timestamp field
    • Applied to both speed and heading displays in portrait and landscape layouts
    • Timer properly canceled in dispose()

  2. Wake Lock Management Centralized

    • Removed wakelock_plus import from SpeedometerScreen
    • Removed _enableWakelock() method entirely
    • Removed WakelockPlus.disable() from dispose()
    • Wake lock now exclusively managed by GpsDataManager (Task 04-01)

  3. Lifecycle Management Centralized

    • Removed WidgetsBindingObserver mixin from SpeedometerScreen
    • Removed didChangeAppLifecycleState() override
    • Removed _isInBackground field and _handleBackgroundTransition() method
    • Removed _requestBatteryOptimizationExemption() stub
    • Lifecycle awareness now exclusively in GpsDataManager (Task 04-01)

  4. Simplified Background Heartbeat

    • Removed _isInBackground check from heartbeat logic
    • Heartbeat now simply checks overlay.isOverlayActive and pushes data
    • Cleaner logic without redundant state tracking

  5. Provider Wiring Completed

    • Added gpsDataManager.setOverlayProvider(overlayProvider) call in initState
    • Enables GpsDataManager to check overlay state for background GPS decisions
    • No circular dependencies (wired after both providers available)

  6. OverlayProvider Cleanup

    • Removed _gracePeriodTimer field
    • Removed all grace period logic from showOverlay() and _handleOverlayClose()
    • Removed grace period cancel from dispose()
    • Grace period management now handled by GpsDataManager's background lifecycle

  7. Enhanced User Experience

    • Added haptic feedback to theme cycling (speed display tap)
    • Added haptic feedback to unit cycling (unit label tap)
    • Consistent tactile response across all main UI interactions

  8. Speed Display Opacity Support

    • Updated _buildSpeedDisplay() to accept opacity parameter
    • Applied staleness opacity to integral and decimal parts
    • Applied staleness opacity to dash display ("--")

  9. TimingConfig Status

    • GPS_GRACE_PERIOD (30s) remains in TimingConfig with deprecation comment
    • No longer referenced anywhere (verified via grep)
    • Kept for documentation of architectural evolution

Task Commits

Task Name Commit Files Modified
1 Add staleness detection to main speed display 1dcfe60 1 file
2 Remove grace period placeholder from OverlayProvider 75d58c0 1 file

Files Created/Modified

Modified:

  • lib/screens/speedometer_screen.dart — Added staleness detection, removed wake lock/lifecycle, simplified heartbeat
  • lib/providers/overlay_provider.dart — Removed grace period placeholder infrastructure

Decisions Made

  1. Consistent Staleness Thresholds: Used OverlayConfig constants for both main app and overlay (3s dim, 10s dash)
  2. Background Heartbeat Simplification: Removed _isInBackground check since GpsDataManager now manages lifecycle
  3. Haptic Feedback Enhancement: Added to theme/unit cycling for better user experience consistency
  4. GPS_GRACE_PERIOD Retention: Kept constant as deprecated for documentation (shows architectural evolution)

Deviations from Plan

None. Plan executed exactly as written. All requirements met without issues.

Issues Encountered

None. Clean execution with no blockers or unexpected complications.

Next Phase Readiness

Phase 4 Complete:

  • ✅ Core GPS engine with lifecycle awareness (Plan 01)
  • ✅ UI integration with staleness detection (Plan 02)
  • ✅ Centralized wake lock and lifecycle management
  • ✅ Consistent staleness behavior (main app + overlay)
  • ✅ Clean provider architecture with proper wiring
  • ✅ All timers properly canceled in dispose()
  • ✅ Flutter analyze passes (only expected SCREAMING_SNAKE warnings)

Architecture State:

  • GpsDataManager: GPS engine, lifecycle observer, wake lock manager, precision switcher
  • OverlayProvider: Overlay lifecycle, GPS stream consumer, settings consumer
  • SpeedometerScreen: UI only (no lifecycle/wake lock/GPS management)
  • Staleness detection: Identical in main app and overlay (3s/10s thresholds)

Testing Recommendations:

  • Field test staleness behavior (3s dim, 10s dash) during GPS signal loss
  • Verify wake lock behavior across app states (foreground/background/overlay)
  • Test precision switching at 8/12 km/h boundaries
  • Validate background GPS stop after 7s grace period without overlay
  • Test haptic feedback on theme/unit cycling

Integration Complete: Phase 4 successfully connected the lifecycle-aware GPS engine to the user-visible surfaces. Main app and overlay now behave identically with consistent staleness rules, centralized power management, and clean architectural separation.

Self-Check: PASSED

Files exist:

FOUND: lib/screens/speedometer_screen.dart
FOUND: lib/providers/overlay_provider.dart

Commits exist:

FOUND: 1dcfe60
FOUND: 75d58c0

Verification checks:

  • ✅ No WakelockPlus references in SpeedometerScreen
  • ✅ No WidgetsBindingObserver in SpeedometerScreen
  • ✅ No grace period timer in OverlayProvider
  • ✅ Staleness timer started and canceled properly
  • ✅ GpsDataManager.setOverlayProvider() called in initState
  • ✅ Flutter analyze passes (30 expected info warnings)

All claims verified. Plan execution complete.

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