Essential Widgets for ADA-Compliant Flutter Apps

( onInvoke: (_) => debugPrint('Enter pressed'), ), }, child: Focus( child: ElevatedButton(onPressed: () {}, child: Text('OK')), ), ), ); ExcludeSemantics and MergeSemantics Sometimes, too much information is read aloud, which confuses users. These widgets let you control how screen readers read groups of widgets. For example, instead of “Volume icon, 80%” being read in two pieces, MergeSemantics lets it be read as “Volume 80%.” This refines the information from the Semantics so it sounds natural. MergeSemantics( child: Row( children: [ Icon(Icons.volume_up), Text('Volume 80%'), ], ), ); Tooltip Tooltips give extra hints. Sighted users see them on hover/focus, and screen readers announce them. For example, an icon-only trash button might be unclear, but adding a tooltip makes it read as “Delete item.” This complements semantics by adding extra clarity where visuals alone aren’t enough. Tooltip( message: 'Delete item', child: IconButton( icon: Icon(Icons.delete), onPressed: () {}, ), ); MediaQuery and Accessibility Settings Users can change global accessibility preferences (large text, reduce motion, high contrast). MediaQuery allows your app to respect these preferences automatically. For example, if someone enables larger fonts in their phone settings, your app should scale text instead of cutting it off. This ensures your app doesn’t fight user preferences. final scale = MediaQuery.of(context).textScaleFactor; ElevatedButton, Switch, Checkbox (Pre-Built Accessible Widgets) Flutter’s built-in Material widgets already include accessibility roles and states. For example, a Checkbox automatically tells the screen reader whether it’s checked or not. This is the default layer of accessibility you get for free if you use Flutter’s standard widgets. But you still need to wrap them in Semantics or ListTile to give them context. Checkbox( value: isChecked, onChanged: (val) {}, )

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