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flutter - How to create circular ElevatedButton

Flutter - Circular ElevatedButton
The ElevatedButton class represents a material design elevated button. The flutter developers can use elevated buttons to add dimension to otherwise mostly flat layouts such as in long busy lists of content, or in wide spaces. The flutter developers should avoid using elevated buttons on already-elevated content such as dialogs or cards. The flutter developers can override the ElevatedButton style with its style parameter. The static styleFrom() method is a convenient way to create an ElevatedButton ButtonStyle from simple values.

The following flutter application development tutorial will demonstrate how we can create a circular ElevatedButton. Here we will use the ElevatedButton class’s style property to display a circle-shaped ElevatedButton widget.

The ElevatedButton class’s style property value is a ButtonStyle object which customizes this button's appearance.

The ButtonStyle class represents the visual properties that most buttons have in common. The ButtonStyle class’s all properties are null by default.

ButtonStyle class’s many properties are MaterialStateProperty objects which resolve to different values depending on the button's state. The material state properties represent values that depend on a widget's material state.

The flutter developers can create a circular ElevatedButton by sending a value to the ButtonStyle class’s shape property.

The ButtonStyle class’s shape property defines the shape of the button's underlying Material.

The MaterialStateProperty resolveWith() is a convenient method for creating a MaterialStateProperty from a MaterialPropertyResolver function alone.

The CircleBorder class represents a border that fits a circle within the available space. In this example, we set the same width and height for the ElevatedButton, so CircleBorder() constructor creates a circular ElevatedButton.
main.dart

import 'package:flutter/material.dart';

void main(){
  runApp(
    MaterialApp(
      theme: ThemeData(primarySwatch: Colors.indigo),
      home: Scaffold(
          appBar: AppBar(
              title: const Text("Flutter - ElevatedButton Circular")
          ),
          body: Center(
            child: ElevatedButton(
                onPressed: (){},
                child: const Text("Click Me"),
                style: ButtonStyle(
                    shape: MaterialStateProperty.resolveWith(
                            (states) => const CircleBorder()
                    ),
                    fixedSize: MaterialStateProperty.resolveWith(
                            (states) => const Size(125, 125)
                    )
                )
            ),
          )
      ),
    ),
  );
}
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