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import 'dart:async';

import 'package:flutter/material.dart';
import 'package:pull_to_refresh_notification/pull_to_refresh_notification.dart';

class PullToRefreshHeader extends StatefulWidget {
  @override
  _PullToRefreshHeaderState createState() => _PullToRefreshHeaderState();
}

zmtzawqlp

import 'package:flutter/material.dart';

class CustomScrollBehavior extends ScrollBehavior {
  @override
  Widget buildViewportChrome(
      BuildContext context, Widget child, AxisDirection axisDirection) {
    // TODO: implement buildViewportChrome
    switch (getPlatform(context)) {
      case TargetPlatform.iOS:
        return child;

zmtzawqlp

import 'package:flutter/material.dart';

typedef OnMySliverAppBarScroll = void Function(double shrinkOffset);

///Sliver App bar
class MySliverAppBar extends StatefulWidget {
  final Color backgroundColor;


  final double expandedHeight;