Its a live blur view for flutter

liveBlur.dart

import 'dart:ui';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

// ignore: must_be_immutable
class MovableStackItem extends StatefulWidget {
  Widget _child;
  double _radius;
  Color _color;

  Widget get getChild => _child;

  double get getRadius => _radius;

  Color get getColor => _color;

  MovableStackItem(
      {Widget child,
      Color color = Colors.transparent,
      double blurRadius = 15.0}) {
    _child = child;
    _color = color;
    _radius = blurRadius;
  }

  @override
  State<StatefulWidget> createState() {
    return MovableStackItemState(this);
  }
}

class MovableStackItemState extends State<MovableStackItem> {
  MovableStackItem parent;
  double xPosition = 0;
  double yPosition = 0;

  MovableStackItemState(this.parent);

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Positioned(
      top: yPosition,
      left: xPosition,
      child: GestureDetector(
        onPanUpdate: (tapInfo) {
          setState(() {
            xPosition += tapInfo.delta.dx;
            yPosition += tapInfo.delta.dy;
          });
        },
        child: ClipRect(
          child: BackdropFilter(
            filter: ImageFilter.blur(
                sigmaX: parent._radius, sigmaY: parent._radius),
            child: Container(
              color: parent.getColor,
              child: parent.getChild,
            ),
          ),
        ),
      ),
    );
  }
}