External Screen
Let's say their is a flutter screen already built or their is a screen which can't be made with Ensemble at the moment, you can construct that screen and Ensemble allows you to navigate to that custom screen.
[NOTE]
You can find the entire source code here (opens in a new tab).
How it works.
This is our beloved counter widget. Let's see how you can specify this widget and call it in your Ensemble App.
class CounterWidget extends StatefulWidget {
const CounterWidget({
super.key,
this.message,
});
final String? message;
@override
State<CounterWidget> createState() => _CounterWidgetState();
}
class _CounterWidgetState extends State<CounterWidget> {
int counter = 0;
void _incrementCounter() {
setState(() {
counter++;
});
}
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: const Text('Flutter Page'),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
widget.message ?? 'You have pushed the button this many times:',
),
Text(
'$counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
);
}
}
First we need to specify a map of name and builder widget. The builder has context and args as parameters.
The args are basically passed using navigateScreen
's inputs.
void main() async {
WidgetsFlutterBinding.ensureInitialized();
Ensemble().setExternalScreenWidgets({
'counterScreen': (context, args) {
final message = args?['message'];
return CounterWidget(message: message);
},
});
runApp(const EnsembleApp());
}
Now, the ensemble framework know about external screen named counterScreen
. We can now navigate to external screen like following.
Button:
label: Navigate external screen
onTap:
navigateScreen:
name: counterScreen
external: true
inputs:
message: Hello world