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main.dart
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main.dart
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import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(debugShowCheckedModeBanner: false, home: Home());
}
}
class Home extends StatefulWidget {
@override
State<Home> createState() => _HomeState();
}
class _HomeState extends State<Home> {
ScrollController scrollController = ScrollController();
bool showbtn = false;
List<String> countries = [
"Indonesia",
"USA",
"United Kingdom",
"China",
"Russia",
"Brazil",
"India",
"Pakistan",
"Nepal",
"Bangladesh",
"Sri Lanka",
"Japan",
"South Korea",
"Mongolia"
];
@override
void initState() {
scrollController.addListener(() {
double showoffset = 10.0;
if (scrollController.offset > showoffset) {
showbtn = true;
setState(() {});
} else {
showbtn = false;
setState(() {});
}
});
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Scroll Back to Top"),
backgroundColor: Colors.orangeAccent),
floatingActionButton: AnimatedOpacity(
duration: const Duration(milliseconds: 1000),
opacity: showbtn ? 1.0 : 0.0,
child: FloatingActionButton(
onPressed: () {
scrollController.animateTo(0, duration: const Duration(milliseconds: 500),
curve: Curves.fastOutSlowIn
);
},
backgroundColor: Colors.orangeAccent,
child: const Icon(Icons.arrow_upward, color: Colors.white,),
),
),
body: SingleChildScrollView(
controller: scrollController, //set controller
child: Column(
children: countries.map((country) {
return Card(
child: ListTile(
title: Text(country)));
}).toList(),
)));
}
}