flutter - Flutter FlatButton is deprecated - alternative solution with width and height

Question

After Flutter Upgrade "FlatButton" is deprecated and I have to use TextButton instead. I didn't find a solution for a new button-type with width and height.

This is my working FlatButton. How can I solve it with textButton or elevatedButton?

_buttonPreview(double _height, double _width) {
    return FlatButton(
      onPressed: () {  },
      height: _height,
      minWidth: _width,
      color: Colors.grey,
      padding: EdgeInsets.all(0),
      child: Text(
        "some text",
        style: TextStyle(color: Colors.white),
      ),
    );
  }

Answer 1

I followed the guide here: https://flutter.dev/docs/release/breaking-changes/buttons.

_buttonPreview(double _height, double _width) {
  final ButtonStyle flatButtonStyle = TextButton.styleFrom(
    minimumSize: Size(_width, _height),
    backgroundColor: Colors.grey,
    padding: EdgeInsets.all(0),
  );
  return TextButton(
    style: flatButtonStyle,
    onPressed: () {},
    child: Text(
      "some text",
      style: TextStyle(color: Colors.white),
    ),
  );
}

Answer 2

You could do something like this.

FlatButton To TextButton Migration

    final ButtonStyle flatButtonStyle = TextButton.styleFrom(
      primary: Colors.white,
      minimumSize: Size(88, 44),
      padding: EdgeInsets.symmetric(horizontal: 16.0),
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(2.0)),
      ),
      backgroundColor: Colors.blue,
    );

    return TextButton(
      style: flatButtonStyle,
      onPressed: () {
        print('Button pressed');
      },
      child: Text('FlatButton To TextButton Migration'),
    );
  }

Sample Buttons

Reference

Migrating to the New Material Buttons and their Themes

New Buttons and Button Themes

Answer 3

Create a style that you might use for the button like this:

final ButtonStyle flatButtonStyle = TextButton.styleFrom(
backgroundColor: Colors.blue,
padding: EdgeInsets.all(8),
//few more styles 

);

Then use the above style while replacing your flatButton

return TextButton(
style: flatButtonStyle,
onPressed: () {},
child: Text(
  "some text",
  style: TextStyle(color: Colors.white),
),);

Answer 4

FlatButton is Deprecated so that is the best option of is ElevatedButton(). Here is the code:

ElevatedButton(
        style: ElevatedButton.styleFrom(
          primary: Colors.teal,
          fixedSize: Size.fromWidth(100),
          padding: EdgeInsets.all(10)
        ),
        child: Text("Press Here"),
        onPressed: (){
          //Code Here
        },
      )

Answer 5

This worked for me, Use:

ElevatedButton(
  onPressed: () {},
  child: Text('Simple FlatButton'),
)

Instead of:

FlatButton(
  onPressed: () {},
  child: Text('Simple FlatButton'),
)