How to apply theme on MaterialButton or RaisedButton?

Question

Can someone help to point how do we define base theme for button and use it on every button? Everywhere I look only found textTheme but not buttonTheme

Answer 1

[August 2020 - Flutter 1.20]

Since 1.20 you can create different button theme configurations based on button types.

Sample code for color settings:

void main() {
  runApp(
    MaterialApp(
      home: Home(),
      theme: ThemeData.from(
        colorScheme: ColorScheme.light(),
      ).copyWith(
        textButtonTheme: TextButtonThemeData(
          style: TextButton.styleFrom(
            primary: Colors.orange,
          ),
        ),
        elevatedButtonTheme: ElevatedButtonThemeData(
          style: ElevatedButton.styleFrom(
            onPrimary: Colors.yellow,
            primary: Colors.blue,
          ),
        ),
        outlinedButtonTheme: OutlinedButtonThemeData(
          style: OutlinedButton.styleFrom(
            primary: Colors.purple,
            backgroundColor: Colors.green,
          ),
        ),
      ),
    ),
  );
}

class Home extends StatelessWidget {
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            TextButton(
              onPressed: () {},
              child: Text('TextButton'),
            ),
            ElevatedButton(
              onPressed: () {},
              child: Text('ElevatedButton'),
            ),
            OutlinedButton(
              onPressed: () {},
              child: Text('OutlinedButton'),
            ),
          ],
        ),
      ),
    );
  }
}

Important release notes from flutter (you can find more information about the options in the migration guide):

FlatButton, RaisedButton, and OutlineButton have been replaced by TextButton, ElevatedButton, and OutlinedButton respectively. ButtonTheme has been replaced by TextButtonTheme, ElevatedButtonTheme, and OutlinedButtonTheme. The original classes will be deprecated soon, please migrate code that uses them. There's a detailed migration guide for the new button and button theme classes in flutter.dev/go/material-button-migration-guide.