Treat Responsive UI & Accessibility as a contract for constraints, size, position, rebuild scope, semantics, and platform adaptation—not merely widget syntax. Prefer focused widgets, const constructors, lazy builders, and responsive constraints.
Build a Complete Mental Model
Treat Responsive UI & Accessibility as a contract for constraints, size, position, rebuild scope, semantics, and platform adaptation—not merely widget syntax. Prefer focused widgets, const constructors, lazy builders, and responsive constraints.
Apply It in Production Flutter
Run and test an original Responsive UI & Accessibility example with small and large screens, text scaling, empty/loading/error states, rapid interaction, navigation restoration, and disposal cases. Use flutter analyze, widget tests, and profile mode where relevant.
After This Lesson
LayoutBuilder(
builder: (context, constraints) {
final wide = constraints.maxWidth >= 700;
return Semantics(
label: 'Task list',
child: wide
? const Row(children: [Expanded(child: TaskList()), Expanded(child: TaskDetails())])
: const TaskList(),
);
},
)The layout adapts at 700px and exposes a semantic labelTry It Yourself
Run and test an original Responsive UI & Accessibility example with small and large screens, text scaling, empty/loading/error states, rapid interaction, navigation restoration, and disposal cases. Use flutter analyze, widget tests, and profile mode where relevant.
Lifecycle and Performance Warning
Assuming one screen's sample output proves every rebuild, overflow, accessibility, async, and lifecycle path.
Accessibility — Flutter