todos-contra-el-fuego-mobile/lib/genericMap.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:map_view/map_view.dart';
import 'globals.dart' as globals;

class GenericMap extends StatefulWidget {
  final String title;
  final double latitude;
  final double longitude;

  GenericMap(
      {@required this.title,
      @required this.latitude,
      @required this.longitude});

  @override
  _GenericMapState createState() => new _GenericMapState(
      title: this.title, latitude: this.latitude, longitude: this.longitude);
}

class _GenericMapState extends State<GenericMap> {
  MapView mapView = new MapView();
  CameraPosition cameraPosition;
  var compositeSubscription = new CompositeSubscription();
  var staticMapProvider;
  Uri staticMapUri;
  final String title;
  Location location;

  _GenericMapState(
      {@required this.title, @required latitude, @required longitude}) {
    MapView.setApiKey(globals.gmapKey);
    this.staticMapProvider = new StaticMapProvider(globals.gmapKey);
    this.location = new Location(latitude, longitude);
  }

  List<Marker> _markers = <Marker>[
    new Marker("1", "Work", 45.523970, -122.663081, color: Colors.blue),
    new Marker("2", "Nossa Familia Coffee", 45.528788, -122.684633),
  ];

  @override
  initState() {
    super.initState();
    cameraPosition = new CameraPosition(location, 2.0);
    staticMapUri = staticMapProvider.getStaticUri(location, 12,
        width: 900, height: 400, mapType: StaticMapViewType.roadmap);
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text(title),
        ),
        body: new Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              new Container(
                height: 250.0,
                child: new Stack(
                  children: <Widget>[
                    new InkWell(
                      child: new Center(
                        child: new Image.network(staticMapUri.toString()),
                      ),
                      onTap: showMap,
                    )
                  ],
                ),
              ),
              new Container(
                padding: new EdgeInsets.only(top: 10.0),
                child: new Text(
                  "Tap the map to interact",
                  style: new TextStyle(fontWeight: FontWeight.bold),
                ),
              ),
            ]));
  }

  showMap() {
    mapView.show(
        new MapOptions(
            mapViewType: MapViewType.normal,
            showUserLocation: true,
            initialCameraPosition: new CameraPosition(new Location(45.5235258, -122.6732493), 14.0),
            title: this.title),
        toolbarActions: [new ToolbarAction("Close", 1)]);

    var sub = mapView.onMapReady.listen((_) {
      mapView.setMarkers(_markers);
      mapView.addMarker(new Marker("3", "10 Barrel", 45.5259467, -122.687747,
          color: Colors.purple));
      mapView.zoomToFit(padding: 100);
    });
    compositeSubscription.add(sub);

    sub = mapView.onLocationUpdated
        .listen((location) => print("Location updated $location"));
    compositeSubscription.add(sub);

    sub = mapView.onTouchAnnotation
        .listen((annotation) => print("annotation tapped"));
    compositeSubscription.add(sub);

    sub = mapView.onMapTapped
        .listen((location) => print("Touched location $location"));
    compositeSubscription.add(sub);

    sub = mapView.onCameraChanged.listen((cameraPosition) =>
        this.setState(() => this.cameraPosition = cameraPosition));
    compositeSubscription.add(sub);

    sub = mapView.onToolbarAction.listen((id) {
      if (id == 1) {
        _handleDismiss();
      }
    });
    compositeSubscription.add(sub);

    sub = mapView.onInfoWindowTapped.listen((marker) {
      print("Info Window Tapped for ${marker.title}");
    });
    compositeSubscription.add(sub);
  }

  _handleDismiss() async {
    double zoomLevel = await mapView.zoomLevel;
    Location centerLocation = await mapView.centerLocation;
    List<Marker> visibleAnnotations = await mapView.visibleAnnotations;
    print("Zoom Level: $zoomLevel");
    print("Center: $centerLocation");
    print("Visible Annotation Count: ${visibleAnnotations.length}");
    var uri = await staticMapProvider.getImageUriFromMap(mapView,
        width: 900, height: 400);
    setState(() => staticMapUri = uri);
    mapView.dismiss();
    compositeSubscription.cancel();
  }
}

class CompositeSubscription {
  Set<StreamSubscription> _subscriptions = new Set();

  void cancel() {
    for (var n in this._subscriptions) {
      n.cancel();
    }
    this._subscriptions = new Set();
  }

  void add(StreamSubscription subscription) {
    this._subscriptions.add(subscription);
  }

  void addAll(Iterable<StreamSubscription> subs) {
    _subscriptions.addAll(subs);
  }

  bool remove(StreamSubscription subscription) {
    return this._subscriptions.remove(subscription);
  }

  bool contains(StreamSubscription subscription) {
    return this._subscriptions.contains(subscription);
  }

  List<StreamSubscription> toList() {
    return this._subscriptions.toList();
  }
}