Implement screenshot capture for share payload
epic-annual-impact-summary-core-services-task-010 — Implement the screenshot capture layer within SummarySharaService that uses Flutter's RenderRepaintBoundary to capture the Wrapped summary widget tree as a PNG image. The capture must be triggered programmatically after all animations have completed (receive a completion signal from the animation controller). Output is a Uint8List image ready for sharing or saving. Handle edge cases: off-screen widgets, high-DPI devices, and widgets still in build phase.
Acceptance Criteria
Technical Requirements
Execution Context
Tier 2 - 518 tasks
Can start after Tier 1 completes
Implementation Notes
Use repaintBoundaryKey.currentContext?.findRenderObject() as RenderRepaintBoundary, then call .toImage(pixelRatio: window.devicePixelRatio). After toImage(), call image.toByteData(format: ImageByteFormat.png) and then image.dispose() immediately. Wrap the entire flow in a try/catch/finally to ensure dispose is always called. For the post-frame retry, use WidgetsBinding.instance.addPostFrameCallback().
Store the AnimationController status externally (e.g., a Completer
Testing Requirements
Widget tests using flutter_test: (1) pump a RepaintBoundary-wrapped widget, trigger capture, and assert returned Uint8List starts with PNG magic bytes; (2) call capture before animation complete and assert SummaryCaptureNotReadyException; (3) simulate debugNeedsPaint=true and assert retry logic fires up to 3 times then throws on continued failure; (4) assert pixel dimensions match logical size * MediaQuery.devicePixelRatio. Manual QA on a 3x iPhone and a 2x Android device to verify sharpness of captured image.
Activity records may contain duplicate entries (as evidenced by the duplicate-detection feature dependency) or proxy-registered activities that should be attributed differently. Including duplicates or mis-attributed records would produce inflated stats, undermining trust in the summary.
Mitigation & Contingency
Mitigation: Implement the aggregation query to join against the deduplication-reviewed-flag on activity records and filter out unresolved duplicates. Coordinate with the duplicate-detection feature team to confirm the authoritative flag field before implementing the RPC. Include a data-quality warning in the summary when unresolved duplicates are detected.
Contingency: If deduplication state is unreliable at release time, add a prominent disclaimer in the summary UI noting that figures reflect all registered activities and may include duplicates pending review. Track a follow-up task to re-aggregate after deduplication runs.
Each organisation wants to define their own milestone thresholds (e.g., NHF's counting model differs from HLF's certification model). Implementing configurable thresholds may expand scope significantly if the configuration UI is expected in this epic.
Mitigation & Contingency
Mitigation: Scope this epic strictly to the evaluation engine and a hardcoded default threshold set. Define the MilestoneDefinition interface with an organisation_id discriminator so per-org configs can be loaded from the database in a later sprint. Build the admin configuration UI as a separate follow-on task outside this epic.
Contingency: If stakeholders require per-org milestone configuration before launch, deliver a JSON-based configuration file per org as an interim solution, loaded from Supabase storage, until a full admin UI is built.
Android 13+ restricts access to media collections and requires READ_MEDIA_IMAGES permission for gallery saves, while older Android versions use WRITE_EXTERNAL_STORAGE. Handling both permission models correctly across the device matrix is error-prone.
Mitigation & Contingency
Mitigation: Use the permission_handler Flutter package with version-aware permission requests abstracted behind the summary-share-service interface. Write platform-specific unit tests for both Android API levels in the test harness. Test on a minimum of three Android versions (API 29, 32, 34) in CI.
Contingency: If gallery save is broken on specific Android versions at launch, disable the 'Save to gallery' option on affected API levels and surface only clipboard and system share sheet, which require no media permissions.