Flutter UI Widgets

Nov 9 2021 · Dart 2.14, Flutter 2.5, VS Code 1.61

Part 1: Flutter UI Widgets

02. Explore Basic Widgets

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Previous episode: 01. Understand Flutter's UI Approach Next episode: 03. Build Layouts

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Open the starter project for this episode in Visual Studio Code. I’m using version 1.60. Inside the main.dart file, you have the main method that runs the root widget of the application. The root widget; MyApp which is a stateless widget returns an empty Container in its build method. More on the Container widget later on.

...
  return const MaterialApp(
    title: 'Flutter UI Widgets',
    home: MainPage(),
  );
...

class MainPage extends StatelessWidget {
  const MainPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter UI Widgets'),
      ),
      body: const Center(
        child: Text('Main Page'),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          print('Clicked');
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}

...
return Container(
  margin: cosnt EdgeInsets.all(32),
  padding: cosnt EdgeInsets.all(16),
  width: 200,
  height: 200,
  color: Colors.green,
  child: const Text('Main Page'),
)
...

...
decoration: BoxDecoration(
  borderRadius: BorderRadius.circular(16),
  border: Border.all(width: 2.0, color: Colors.red),
  color: Colors.green,
),
...

...
child: Column(
  children: <Widget>[
    const Text('1'),
    const Text('2'),
    const Text('3'),
  ],
),
...

const Text('1', style: TextStyle(fontSize: 32)),
const Text('2', style: TextStyle(fontSize: 32)),
const Text('3', style: TextStyle(fontSize: 32)),

mainAxisAlignment: MainAxisAlignment.spaceEvenly,

crossAxisAlignment: CrossAxisAlignment.stretch

Container(
  color: Colors.blue,
  child: const Text(
    '1',
    textAlign: TextAlign.center,
    style: TextStyle(fontSize: 32),
  ),
),
// Repeat this for the remaining 2 

textAlign: TextAlign.center