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;

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 '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';
import 'package:flutter/rendering.dart';

void main() => runApp(new MyApp());

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => new MyAppState();
}

zmtzawqlp

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(

zmtzawqlp

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

///弹出下拉框
class MyPopupMenuItem<T> extends MyPopupMenuEntry<T> {
  /// Creates an item for a popup menu.
  ///
  /// By default, the item is [enabled].
  ///

zmtzawqlp

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',

zmtzawqlp

import 'package:flutter/material.dart';


void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        home: MyHomePage(),
      );

zmtzawqlp

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(

zmtzawqlp

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: PullDownRefresh(),
    );