Programming Flutter

The Finished Layout

If you have done everything correctly, you probably have ended up with the following code in main.dart:

layout/calculator_part2/lib/main.dart

import "package:flutter/material.dart";


class ExpandedButton extends StatelessWidget {

  ExpandedButton({this.onPressed, this.child, this.color});

  final Widget child;
  final VoidCallback onPressed;
  final Color color;

  @override
  Widget build(BuildContext context) =>
    Expanded(
      flex:1,
      child: FlatButton(
        onPressed: onPressed,
        child: child,
        color: color,
      ),
    );
}

class ExpandedRow extends StatelessWidget {

  ExpandedRow({this.children, this.crossAxisAlignment});

  final List<Widget> children;
  final CrossAxisAlignment ...