Implement focus management across wizard steps
epic-quick-activity-registration-wizard-ui-task-012 — Ensure focus is programmatically moved to the first interactive element of each step when it becomes active, and returned to the trigger element (e.g., the Add button in the bottom nav) when the bottom sheet closes or dismisses. Use FocusNode and FocusScope with proper lifecycle cleanup.
Acceptance Criteria
Technical Requirements
Execution Context
Tier 4 - 323 tasks
Can start after Tier 3 completes
Implementation Notes
Use WidgetsBinding.instance.addPostFrameCallback to defer the focus request until after the step widget has been laid out. Store a GlobalKey on the bottom nav Add button and pass it down (or via InheritedWidget/BLoC) to the bottom sheet so it can call FocusScope.of(context).requestFocus(addButtonFocusNode) on close. Each step widget should call FocusScope.of(context).requestFocus(_myFirstFocusNode) inside its initState post-frame callback. Avoid using autofocus: true on text fields inside steps because autofocus fires even when the step is not visible in an offscreen PageView page — use explicit FocusNode requests triggered by the step becoming active.
Watch for the common pitfall of requesting focus before the widget is attached to the focus tree; guard with mounted check.
Testing Requirements
Write flutter_test widget tests covering: (1) focus lands on first element after PageView/step controller advances to each step index, (2) focus returns to the Add button GlobalKey after sheet dismissal via both programmatic close and back-button pop, (3) FocusNode.dispose() is called exactly once per step on widget removal (use a FocusNode subclass with a dispose counter). Integration test: drive the full wizard in a test harness, assert SemanticsNode for the first element of each step is focused after transition. No e2e device tests required for this task alone, but results must not regress the accessibility audit in task-015.
As wizard steps accumulate additional features (duplicate warning, retroactive date chips, custom duration entry), the two-tap happy path may inadvertently require extra interactions. A step that previously auto-advanced may start requiring a confirmation tap, breaking the core promise of the feature and increasing friction for high-frequency users like HLF's 380-registration peer mentor.
Mitigation & Contingency
Mitigation: Define and automate a regression test that performs the complete two-tap happy path (open bottom sheet → confirm → confirm) and asserts the confirmation view is reached in exactly two tap events. Run this test in CI on every PR touching the wizard. Treat any failure as a blocking defect.
Contingency: If a new feature unavoidably adds a tap to the happy path, provide a 'quick mode' toggle in user settings that collapses the wizard to a single-confirmation screen for users who never change defaults.
Flutter bottom sheets are dismissed on back-button press or background tap by default. If the wizard state is not preserved, a peer mentor who accidentally dismisses mid-flow loses all their entered data and must start over — a significant frustration for users with cognitive disabilities or motor impairments who take longer to fill each step.
Mitigation & Contingency
Mitigation: Implement the wizard state as a persistent Cubit that outlives the bottom sheet widget's lifecycle, scoped to the registration feature route. On re-open, the Cubit restores the previous step and field values. Add a 'discard changes?' confirmation dialog when the user explicitly dismisses a partially filled wizard.
Contingency: If persistent state proves difficult to implement with the chosen routing strategy, implement draft auto-save to a local draft repository every time a field value changes, and restore from draft on the next open.
Multi-step wizard bottom sheets are among the most complex accessibility scenarios in Flutter. Screen readers (TalkBack, VoiceOver) may not announce step transitions, focus may land on the wrong element after advancing, and animated transitions can interfere with the accessibility tree update cycle — making the feature unusable for Blindeforbundet users who rely on screen readers.
Mitigation & Contingency
Mitigation: Assign each wizard step a unique Semantics container with a live region announcement on mount. Use ExcludeSemantics on inactive steps during transition animations. Test each step transition manually with TalkBack and VoiceOver as part of the definition of done for each step component.
Contingency: If animated transitions cause accessibility tree corruption, disable step transition animations entirely in accessibility mode (detected via MediaQuery.accessibleNavigation) and use instant step replacement instead.
The NotesStep relies on the OS keyboard's built-in dictation button for speech-to-text input. This button's availability, position, and behaviour varies significantly between iOS (reliable, visible dictation key) and Android (varies by keyboard, OEM skin, and language settings). HLF and Blindeforbundet specifically requested this capability; if it is unreliable on Android, it fails a SHOULD HAVE requirement for a significant portion of users.
Mitigation & Contingency
Mitigation: Document that the notes dictation feature depends on the device's native keyboard dictation and requires no in-app microphone permission. Add explicit placeholder copy informing users they can use their keyboard's dictation button. Test on a minimum of three Android OEM keyboards (Gboard, Samsung, Swiftkey) and two iOS versions.
Contingency: If native keyboard dictation is too unreliable on Android, implement a fallback in-app microphone button in the NotesStep that triggers the platform's SpeechRecognition API directly via a method channel, scoped only to the notes field with no session recording capability.