Android zoom page transition display scrim in an odd position when there are nested navigators. #116127
Description
Run on Android and tab between PageOne and PageTwo, notice the scrim darkens the screen in an unexpected manner. b/260364434
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MainPage(),
);
}
}
class MainPage extends StatelessWidget {
final navigatorKey = GlobalKey<NavigatorState>();
@override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Expanded(
child: Navigator(
key: navigatorKey,
onGenerateRoute: (route) => MaterialPageRoute(
settings: route,
builder: (context) => PageOne(),
),
),
),
BottomNavigationBar(navigatorKey)
],
),
);
}
}
class BottomNavigationBar extends StatelessWidget {
final GlobalKey<NavigatorState> navigatorKey;
BottomNavigationBar(this.navigatorKey) : assert(navigatorKey != null);
Future<void> push(Route route) {
return navigatorKey.currentState!.push(route);
}
@override
Widget build(BuildContext context) {
return Container(
color: Colors.blue,
child: ButtonBar(
alignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
TextButton(
child: Text("PageOne", style: TextStyle(color: Colors.red)),
onPressed: () {
push(MaterialPageRoute(builder: (context) => PageOne()));
},
),
TextButton(
child: Text("PageTwo", style: TextStyle(color: Colors.red)),
onPressed: () {
push(MaterialPageRoute(builder: (context) => PageTwo()));
},
)
],
),
);
}
}
class PageOne extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("Page One"),
TextButton(
onPressed: (){
Navigator.of(context).pop();
},
child: Text("Pop"),
),
],
),
);
}
}
class PageTwo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("Page Two"),
TextButton(
onPressed: (){
Navigator.of(context).pop();
},
child: Text("Pop"),
),
],
),
);
}
}