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Platform Accessibility Bridge

Component Detail

Infrastructure medium complexity Shared Component mobile
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Description

Thin platform-channel wrapper that queries the host OS for active assistive technology state (VoiceOver on iOS, TalkBack on Android, Switch Access) and exposes a unified Dart API. Used by the Screen Reader Support Service and preferences store to adapt behavior without duplicating platform detection logic.

Feature: WCAG 2.2 AA Compliance

platform-accessibility-bridge

Responsibilities

  • Detect whether VoiceOver or TalkBack is currently active
  • Query platform bold-text and reduce-motion accessibility flags
  • Provide an observable stream of assistive technology state changes
  • Abstract iOS and Android differences behind a single interface

Interfaces

isScreenReaderActive(): Future<bool>
isBoldTextEnabled(): Future<bool>
isReduceMotionEnabled(): Future<bool>
watchAccessibilityState(): Stream<PlatformAccessibilityState>
getActiveAssistiveTechnologies(): Future<List<AssistiveTechnology>>