gps-speedo/.planning/phases/03-overlay-refactor/03-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	duration	completed
03-overlay-refactor	02	overlay	flutter overlay staleness error-handling provider permission-handler flutter-overlay-window	phase provides 03-01 OverlayService wrapper with retry logic, OverlayMessage timestamp tracking, staleness constants	OverlayProvider delegates all platform calls to OverlayService with permission checks and verified creation Error callback mechanism connects OverlayProvider to SpeedometerScreen for snackbar surfacing Overlay screen detects stale GPS data (dim at 3s, dashes at 10s) with immediate snap-back on fresh data Permission errors surface to user with "Settings" action button that opens app settings GPS grace period timer (30s) starts on overlay close (infrastructure for Phase 4)	04-gps-optimization	added patterns permission_handler Error callback pattern for provider-to-screen communication without BuildContext Staleness detection via timestamp comparison in build() Immediate snap-back on fresh data (no animation)	created modified lib/providers/overlay_provider.dart lib/screens/overlay_screen.dart lib/screens/speedometer_screen.dart lib/main.dart	OverlayProvider delegates ALL FlutterOverlayWindow calls to OverlayService (no direct usage) Error callback set by SpeedometerScreen after provider available (late binding for BuildContext) Staleness opacity applied via withValues(alpha:) to color (no AnimatedOpacity per user decision) GPS grace period timer created but does not yet control GPS lifecycle (Phase 4 scope)	OverlayError enum for typed error surfacing (permission, creationFailed, communicationDegraded) onError callback field on OverlayProvider set by SpeedometerScreen in postFrameCallback Staleness check timer runs every 1 second, dims at 3s, shows dashes at 10s Permission errors show snackbar with Settings action button via openAppSettings()	4.25min	2026-02-11

Phase 03 Plan 02: Overlay Integration Summary

OverlayService integration with permission checks, verified creation, staleness detection (3s dim/10s dash), and error surfacing via snackbars with Settings action

Performance

• Duration: 4.25 min
• Started: 2026-02-11T10:20:25Z
• Completed: 2026-02-11T10:24:40Z
• Tasks: 2
• Files modified: 4

Accomplishments

• OverlayProvider delegates all platform calls to OverlayService with permission checks before showing overlay
• Overlay creation verified via isActive() check before setting _isOverlayActive flag
• Overlay screen detects stale GPS data with two-stage visual feedback (dim at 3s, dashes at 10s)
• Permission errors surface to user via snackbar with "Settings" action button that opens app settings
• GPS grace period timer (30s) infrastructure created for Phase 4

Task Commits

Each task was committed atomically:

1. Task 1: Refactor OverlayProvider to use OverlayService with error callback and GPS grace period - 66bdd35 (feat)
2. Task 2: Add staleness detection to overlay screen and error surfacing to SpeedometerScreen - cc11a3d (feat)

Files Created/Modified

• lib/providers/overlay_provider.dart - Added OverlayService dependency, error callback mechanism, permission checks, verified creation, GPS grace period timer
• lib/screens/overlay_screen.dart - Added staleness monitoring timer, timestamp tracking, opacity-based dimming, dash display after 10s
• lib/screens/speedometer_screen.dart - Added error callback registration, _handleOverlayError method, snackbar surfacing with Settings action
• lib/main.dart - Registered OverlayService in MultiProvider, injected into OverlayProvider constructor

Decisions Made

OverlayProvider refactor:

• All FlutterOverlayWindow calls replaced with OverlayService methods (showOverlay, closeOverlay, shareData, isActive, overlayListener)
• Permission check via _overlayService.checkPermission() before showing overlay
• Overlay creation success verified via _overlayService.showOverlay() return value (bool)
• _isOverlayActive only set after successful verification (prevents false positive active state)
• Error callback mechanism uses nullable function field set by SpeedometerScreen after provider available (late binding for BuildContext)
• GPS grace period timer (30s) starts on overlay close, cancelled on reopen or dispose (infrastructure only, Phase 4 will control GPS lifecycle)

Overlay screen staleness detection:

• _lastUpdateTime field tracks timestamp from OverlayMessage.timestamp
• Staleness check timer runs every 1 second (OverlayConfig.STALENESS_CHECK_INTERVAL)
• Timer callback shows "--" for speed after 10 seconds (OverlayConfig.STALENESS_DASH_THRESHOLD)
• Build() calculates staleness opacity (0.5 after 3s via OverlayConfig.STALENESS_DIM_THRESHOLD)
• Staleness opacity applied via color.withValues(alpha:) to speed text, unit text, heading icon, heading text
• No AnimatedOpacity used per user decision (immediate snap-back, no fade-in animation)

SpeedometerScreen error surfacing:

• Error callback registered in initState() postFrameCallback (after context available)
• _handleOverlayError shows snackbar with message and optional action button
• Permission error: snackbar with "Settings" action button that calls openAppSettings()
• Creation failure: snackbar with error message (no action button)
• Communication degraded: snackbar with error message (no action button)
• Error callback nulled in dispose() with try-catch (provider might already be disposed)

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None

Next Phase Readiness

Phase 3 complete. Ready for Phase 4 (GPS Optimization):

• Overlay communication is reliable with retry logic and verified creation
• Staleness detection provides visual feedback when GPS data is stale
• Error surfacing gives users actionable guidance (permission Settings button)
• GPS grace period timer infrastructure exists for Phase 4 GPS lifecycle management
• All OVRL-01 through OVRL-06 requirements satisfied

Phase 4 blockers:

• None

Phase 4 dependencies satisfied:

• GPS grace period timer exists (Phase 4 will control GPS subscription start/stop)
• Overlay active state is reliable (verified creation, status check monitoring)
• Background heartbeat only runs when overlay active AND app backgrounded (ready for GPS optimization)

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Phase: 03-overlay-refactor Completed: 2026-02-11