Custom Checkbox Flutter

A checkbox is a type of input widget which holds the Boolean value. In flutter, we have a Material Checkbox. But it has some limitations like we can not edit border color.

So to solve this we can create a CustomCheckbox.

The CustomCheckbox have the following parameters.

isChecked – This is used to set the initial value of the checkbox. The default value is false
size – To set the size of our custom checkbox
iconSize – Size of the check icon
selectedColor – Selected color of the Checkbox background
selectedIconColor – Selected Icon Color
borderColor– Set the color of the border
checkIcon – Change the check Icon

Code

import 'package:flutter/material.dart';

class CustomCheckbox extends StatefulWidget {
  final Function onChange;
  final bool isChecked;
  final double size;
  final double iconSize;
  final Color selectedColor;
  final Color selectedIconColor;
  final Color borderColor;
  final Icon checkIcon;

  CustomCheckbox(
      {this.isChecked,
      this.onChange,
      this.size,
      this.iconSize,
      this.selectedColor,
      this.selectedIconColor,
      this.borderColor,
      this.checkIcon});

  @override
  _CustomCheckboxState createState() => _CustomCheckboxState();
}

class _CustomCheckboxState extends State<CustomCheckbox> {
  bool _isSelected = false;

  @override
  void initState() {
    _isSelected = widget.isChecked ?? false;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        setState(() {
          _isSelected = !_isSelected;
          widget.onChange(_isSelected);
        });
      },
      child: AnimatedContainer(
        margin: EdgeInsets.all(4),
        duration: Duration(milliseconds: 500),
        curve: Curves.fastLinearToSlowEaseIn,
        decoration: BoxDecoration(
            color: _isSelected
                ? widget.selectedColor ?? Colors.blue
                : Colors.transparent,
            borderRadius: BorderRadius.circular(3.0),
            border: Border.all(
              color: widget.borderColor ?? Colors.black,
              width: 1.5,
            )),
        width: widget.size ?? 18,
        height: widget.size ?? 18,
        child: _isSelected
            ? Icon(
                Icons.check,
                color: widget.selectedIconColor ?? Colors.white,
                size: widget.iconSize ?? 14,
              )
            : null,
      ),
    );
  }
}

Thanks for Reading