docs(03-02): complete overlay integration plan
Tasks completed: 2/2 - Task 1: Integrated OverlayService into OverlayProvider with error callbacks and GPS grace period - Task 2: Added staleness detection to overlay screen and error surfacing to SpeedometerScreen SUMMARY: .planning/phases/03-overlay-refactor/03-02-SUMMARY.md
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Mikkeli Matlock
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---
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phase: 03-overlay-refactor
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plan: 02
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subsystem: overlay
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tags: [flutter, overlay, staleness, error-handling, provider, permission-handler, flutter-overlay-window]
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# Dependency graph
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requires:
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- phase: 03-01
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provides: OverlayService wrapper with retry logic, OverlayMessage timestamp tracking, staleness constants
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provides:
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- OverlayProvider delegates all platform calls to OverlayService with permission checks and verified creation
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- Error callback mechanism connects OverlayProvider to SpeedometerScreen for snackbar surfacing
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- Overlay screen detects stale GPS data (dim at 3s, dashes at 10s) with immediate snap-back on fresh data
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- Permission errors surface to user with "Settings" action button that opens app settings
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- GPS grace period timer (30s) starts on overlay close (infrastructure for Phase 4)
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affects: [04-gps-optimization]
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# Tech tracking
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tech-stack:
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added: [permission_handler]
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patterns:
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- Error callback pattern for provider-to-screen communication without BuildContext
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- Staleness detection via timestamp comparison in build()
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- Immediate snap-back on fresh data (no animation)
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key-files:
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created: []
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modified:
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- lib/providers/overlay_provider.dart
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- lib/screens/overlay_screen.dart
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- lib/screens/speedometer_screen.dart
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- lib/main.dart
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key-decisions:
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- "OverlayProvider delegates ALL FlutterOverlayWindow calls to OverlayService (no direct usage)"
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- "Error callback set by SpeedometerScreen after provider available (late binding for BuildContext)"
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- "Staleness opacity applied via withValues(alpha:) to color (no AnimatedOpacity per user decision)"
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- "GPS grace period timer created but does not yet control GPS lifecycle (Phase 4 scope)"
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patterns-established:
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- "OverlayError enum for typed error surfacing (permission, creationFailed, communicationDegraded)"
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- "onError callback field on OverlayProvider set by SpeedometerScreen in postFrameCallback"
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- "Staleness check timer runs every 1 second, dims at 3s, shows dashes at 10s"
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- "Permission errors show snackbar with Settings action button via openAppSettings()"
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# Metrics
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duration: 4.25min
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completed: 2026-02-11
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---
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# Phase 03 Plan 02: Overlay Integration Summary
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**OverlayService integration with permission checks, verified creation, staleness detection (3s dim/10s dash), and error surfacing via snackbars with Settings action**
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## Performance
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- **Duration:** 4.25 min
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- **Started:** 2026-02-11T10:20:25Z
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- **Completed:** 2026-02-11T10:24:40Z
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- **Tasks:** 2
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- **Files modified:** 4
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## Accomplishments
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- OverlayProvider delegates all platform calls to OverlayService with permission checks before showing overlay
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- Overlay creation verified via isActive() check before setting _isOverlayActive flag
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- Overlay screen detects stale GPS data with two-stage visual feedback (dim at 3s, dashes at 10s)
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- Permission errors surface to user via snackbar with "Settings" action button that opens app settings
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- GPS grace period timer (30s) infrastructure created for Phase 4
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Refactor OverlayProvider to use OverlayService with error callback and GPS grace period** - `66bdd35` (feat)
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2. **Task 2: Add staleness detection to overlay screen and error surfacing to SpeedometerScreen** - `cc11a3d` (feat)
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## Files Created/Modified
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- `lib/providers/overlay_provider.dart` - Added OverlayService dependency, error callback mechanism, permission checks, verified creation, GPS grace period timer
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- `lib/screens/overlay_screen.dart` - Added staleness monitoring timer, timestamp tracking, opacity-based dimming, dash display after 10s
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- `lib/screens/speedometer_screen.dart` - Added error callback registration, _handleOverlayError method, snackbar surfacing with Settings action
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- `lib/main.dart` - Registered OverlayService in MultiProvider, injected into OverlayProvider constructor
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## Decisions Made
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**OverlayProvider refactor:**
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- All FlutterOverlayWindow calls replaced with OverlayService methods (showOverlay, closeOverlay, shareData, isActive, overlayListener)
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- Permission check via _overlayService.checkPermission() before showing overlay
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- Overlay creation success verified via _overlayService.showOverlay() return value (bool)
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- _isOverlayActive only set after successful verification (prevents false positive active state)
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- Error callback mechanism uses nullable function field set by SpeedometerScreen after provider available (late binding for BuildContext)
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- GPS grace period timer (30s) starts on overlay close, cancelled on reopen or dispose (infrastructure only, Phase 4 will control GPS lifecycle)
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**Overlay screen staleness detection:**
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- _lastUpdateTime field tracks timestamp from OverlayMessage.timestamp
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- Staleness check timer runs every 1 second (OverlayConfig.STALENESS_CHECK_INTERVAL)
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- Timer callback shows "--" for speed after 10 seconds (OverlayConfig.STALENESS_DASH_THRESHOLD)
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- Build() calculates staleness opacity (0.5 after 3s via OverlayConfig.STALENESS_DIM_THRESHOLD)
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- Staleness opacity applied via color.withValues(alpha:) to speed text, unit text, heading icon, heading text
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- No AnimatedOpacity used per user decision (immediate snap-back, no fade-in animation)
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**SpeedometerScreen error surfacing:**
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- Error callback registered in initState() postFrameCallback (after context available)
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- _handleOverlayError shows snackbar with message and optional action button
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- Permission error: snackbar with "Settings" action button that calls openAppSettings()
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- Creation failure: snackbar with error message (no action button)
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- Communication degraded: snackbar with error message (no action button)
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- Error callback nulled in dispose() with try-catch (provider might already be disposed)
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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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## Next Phase Readiness
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**Phase 3 complete. Ready for Phase 4 (GPS Optimization):**
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- Overlay communication is reliable with retry logic and verified creation
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- Staleness detection provides visual feedback when GPS data is stale
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- Error surfacing gives users actionable guidance (permission Settings button)
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- GPS grace period timer infrastructure exists for Phase 4 GPS lifecycle management
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- All OVRL-01 through OVRL-06 requirements satisfied
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**Phase 4 blockers:**
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- None
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**Phase 4 dependencies satisfied:**
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- GPS grace period timer exists (Phase 4 will control GPS subscription start/stop)
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- Overlay active state is reliable (verified creation, status check monitoring)
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- Background heartbeat only runs when overlay active AND app backgrounded (ready for GPS optimization)
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---
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*Phase: 03-overlay-refactor*
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*Completed: 2026-02-11*
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