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simple.dart
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simple.dart
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import 'package:flutter/material.dart';
import 'package:universe/universe.dart';
class ControllerMap extends StatefulWidget {
const ControllerMap({super.key});
@override
State<ControllerMap> createState() => _ControllerMapState();
}
class _ControllerMapState extends State<ControllerMap> {
final _mapKey = UniqueKey();
final _mapController = MapController();
MapData? _mapData;
@override
void dispose() {
_mapController.dispose();
super.dispose();
}
void _listenPositionStream() {
if (mounted) {
setState(() {
_mapData = MapData(
center: _mapController.center,
zoom: _mapController.zoom!,
);
});
}
// listen everytime the map data changes (move or zoom)
_mapController.positionStream?.listen((data) {
if (mounted) {
setState(() {
_mapData = data;
});
}
});
}
@override
Widget build(BuildContext context) {
return Stack(
children: [
U.OpenStreetMap(
key: _mapKey,
controller: _mapController,
center: [51.555158, -0.108343],
zoom: 15,
onReady: () {
_listenPositionStream(); // start listening after controller ready
},
),
if (_mapData != null)
Align(
alignment: Alignment.bottomLeft,
child: Container(
margin: const EdgeInsets.only(
left: 20,
bottom: 90,
right: 40,
),
child: Material(
elevation: 6,
child: Container(
color: Colors.white,
padding: const EdgeInsets.symmetric(
vertical: 7,
horizontal: 10,
),
child: Text(
'Center: ${_mapData!.center.toSimpleString()}\nZoom: ${_mapData!.zoom}',
),
),
),
),
),
],
);
}
}