main.dart
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/*import 'package:flutter/widgets.dart';
import 'src/first_method.dart' as firstMethod;
import 'src/second_method.dart' as secondMethod;
void main() {
const method = int.fromEnvironment('method', defaultValue: 1);
runApp(method == 1 ? firstMethod.MyApp() : secondMethod.MyApp());
}
*/
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
void main() {
runApp(ScreenUtilInit(
builder: (child) => MaterialApp(
key: GlobalObjectKey('screenutil'),
theme: ThemeData(
textTheme: TextTheme(
bodyText2: TextStyle(fontSize: 32.sp),
),
),
home: child,
),
child: ThirdPage(),
));
}
class MyStatelessElement<T extends TestPage> extends StatelessElement {
MyStatelessElement(T widget) : super(widget);
@override
T get widget => super.widget as T;
@override
void mount(Element? parent, Object? newSlot) {
super.mount(parent, newSlot);
print('${widget.text()} is mounted');
}
@override
void unmount() {
print('${widget.text()} is unmounted');
super.unmount();
}
}
abstract class TestPage extends StatelessWidget {
String text() => runtimeType.toString();
Widget goto();
@override
StatelessElement createElement() => MyStatelessElement(this);
@override
Widget build(BuildContext context) {
Timer(const Duration(seconds: 5), () {
Navigator.of(context).pushAndRemoveUntil(
MaterialPageRoute(builder: (context) => goto()),
(route) => false,
);
});
return Scaffold(
body: SafeArea(
child: Padding(
padding: const EdgeInsets.all(20).r,
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
TextField(),
Text(
text(),
style: TextStyle(fontSize: 32.sp),
),
Text(text()),
Expanded(
child: ListView.separated(
shrinkWrap: true,
itemBuilder: (context, index) => Text('$index'),
separatorBuilder: (_, __) => Container(
height: 50.h,
color: Colors.green,
),
itemCount: 10,
),
),
],
),
),
),
);
}
}
class FirstPage extends TestPage {
@override
Widget goto() => SecondPage();
}
class SecondPage extends TestPage {
@override
Widget goto() => FirstPage();
}
class ThirdPage extends TestPage {
@override
Widget goto() => FirstPage();
}