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flutter - How to create a circular TextButton

Flutter - Circular TextButton
The TextButton class represents a material design text button. The flutter developers can use text buttons on toolbars, in dialogs, or in line with other content. Text buttons do not have visible borders. The flutter developers should avoid using text buttons where they would blend in with other content such as in the middle of lists. The TextButton style can be overridden with its style parameter.

The following flutter application development tutorial will demonstrate how we can create a circular TextButton. That means we will make circle shaped TextButton. In the below example code, we will use the TextButton class’s styleFrom() method to create a circular TextButton widget.

The TextButton class’s styleFrom() method is a static convenience method that constructs a text button ButtonStyle given simple values. By default, TextButton class styleFrom() method returns a ButtonStyle that doesn't override anything.

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

The flutter developers can create a circular TextButton with a border by passing a value to the styleFrom() method’s shape parameter.

The styleFrom() method’s shape parameter value is an OutlinedBorder instance which adds a border to the TextButton.

The OutlinedBorder class represents a ShapeBorder that draws an outline with the width and color specified by the side. Here we will pass a CircleBorder instance for the shape parameter value.

The CircleBorder class represents a border that fits a circle within the available space. By using this parameter value we make the circular TextButton. We also have to set the same value for the TextButton widget’s width and height.

The CircleBorder class side property value is a BorderSide instance. The BorderSide class represents a side of a border of a box. The BorderSide class color property value is a Color that is the color of this side of the border. The BorderSide class width property value is a double instance that is the width of this side of the border, in logical pixels.

The flutter developers can change a TextButton’s width and height (size) by passing a value to the styleFrom() method’s fixedSize parameter.

The styleFrom() method’s fixedSize parameter value is a Size instance, which holds a 2D floating-point size. Here we used the Size class Size(double width, double height) constructors to create a Size with the given width and height.

So we can pass our specified width and height value to this Size(double width, double height) constructor to set the specified size of the TextButton widget. Here we set the same value for the width and height to create a circular TextButton.
main.dart

import 'package:flutter/material.dart';

void main(){
  runApp(
    MaterialApp(
      theme: ThemeData(primarySwatch: Colors.indigo),
      home: Scaffold(
          appBar: AppBar(
              title: const Text("Flutter - Circular TextButton")
          ),
          body: Center(
            child: TextButton(
                onPressed: (){},
                child: const Text("Click Me"),
                style: TextButton.styleFrom(
                    shape: const CircleBorder(
                        side: BorderSide(
                            color: Colors.indigo, width: 1
                        )
                    ),
                    fixedSize: const Size(125,125)
                )
            ),
          )
      ),
    ),
  );
}
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