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Add Google Maps Place Tracker sample app to flutter/samples. (#20)
Sample app that displays places on a map. Add/edit places. Interact with map. Iterations to follow.
This commit is contained in:
Kenzie Schmoll
GitHub
433
place_tracker/lib/place_map.dart
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433
place_tracker/lib/place_map.dart
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:google_maps_flutter/google_maps_flutter.dart';
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import 'place.dart';
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import 'place_stub_data.dart';
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import 'place_details.dart';
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class PlaceMap extends StatefulWidget {
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const PlaceMap({
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Key key,
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this.center,
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}) : super(key: key);
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final LatLng center;
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@override
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PlaceMapState createState() => PlaceMapState();
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}
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class PlaceMapState extends State<PlaceMap> {
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static BitmapDescriptor _getPlaceMarkerIcon(PlaceCategory category) {
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// TODO(kenzieschmoll): use custom marker assets.
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double markerHue;
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switch (category) {
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case PlaceCategory.favorite:
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markerHue = BitmapDescriptor.hueRed;
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break;
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case PlaceCategory.visited:
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markerHue = BitmapDescriptor.hueViolet;
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break;
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case PlaceCategory.wantToGo:
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default:
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markerHue = BitmapDescriptor.hueAzure;
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}
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return BitmapDescriptor.defaultMarkerWithHue(markerHue);
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}
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static List<Place> _getPlacesForCategory(PlaceCategory category, Map<Marker, Place> places) {
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return places.values.where((Place place) => place.category == category).toList();
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}
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GoogleMapController mapController;
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PlaceCategory _selectedPlaceCategory = PlaceCategory.favorite;
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Map<Marker, Place> _places = Map<Marker, Place>();
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Marker _pendingMarker;
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void onMapCreated(GoogleMapController controller) async {
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mapController = controller;
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mapController.onInfoWindowTapped.add(_onInfoWindowTapped);
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// Add stub data on creation so we have something interesting to look at.
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final Map<Marker, Place> places = await _initializeStubPlaces();
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_zoomToFitPlaces(_getPlacesForCategory(_selectedPlaceCategory, places));
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}
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Future<Map<Marker, Place>> _initializeStubPlaces() async {
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await Future.wait(PlaceStubData.places.map((Place place) => _initializeStubPlace(place)));
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return _places;
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}
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Future<void> _initializeStubPlace(Place place) async {
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final Marker marker = await mapController.addMarker(
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MarkerOptions(
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position: place.latLng,
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icon: _getPlaceMarkerIcon(place.category),
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infoWindowText: InfoWindowText(
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place.name,
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'${place.starRating} Star Rating',
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),
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visible: place.category == _selectedPlaceCategory,
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),
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);
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_places[marker] = place;
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}
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void _onInfoWindowTapped(Marker marker) async {
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_pushPlaceDetailsScreen(marker);
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}
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Future<void> _pushPlaceDetailsScreen(Marker marker) async {
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assert(marker != null);
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Navigator.push(
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context,
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MaterialPageRoute(builder: (context) {
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return PlaceDetails(
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place: _places[marker],
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onChanged: (Place value) {
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_updatePlaceAndMarker(value, marker);
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},
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);
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}),
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);
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}
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Future<void> _updatePlaceAndMarker(Place place, Marker marker) async {
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_places[marker] = place;
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// Set marker visibility to false to ensure the info window is hidden. Once
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// the plugin fully supports the Google Maps API, use hideInfoWindow()
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// instead.
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await mapController.updateMarker(
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marker,
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MarkerOptions(
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visible: false,
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),
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);
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await mapController.updateMarker(
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marker,
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MarkerOptions(
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infoWindowText: InfoWindowText(
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place.name,
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place.starRating != 0
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? '${place.starRating} Star Rating'
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: null,
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),
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visible: true,
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),
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);
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}
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void _updatePlaces(PlaceCategory category) {
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setState(() {
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_selectedPlaceCategory = category;
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_showPlacesForSelectedCategory();
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});
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}
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void _showPlacesForSelectedCategory() {
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_places.forEach((Marker marker, Place place) {
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mapController.updateMarker(
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marker,
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MarkerOptions(
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visible: place.category == _selectedPlaceCategory,
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),
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);
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});
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_zoomToFitPlaces(_getPlacesForCategory(_selectedPlaceCategory, _places));
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}
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void _zoomToFitPlaces(List<Place> places) {
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// Default min/max values to latitude and longitude of center.
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double minLat = widget.center.latitude;
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double maxLat = widget.center.latitude;
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double minLong = widget.center.longitude;
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double maxLong = widget.center.longitude;
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for (Place place in places) {
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minLat = min(minLat, place.latitude);
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maxLat = max(maxLat, place.latitude);
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minLong = min(minLong, place.longitude);
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maxLong = max(maxLong, place.longitude);
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}
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mapController.animateCamera(
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CameraUpdate.newLatLngBounds(
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LatLngBounds(
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southwest: LatLng(minLat, minLong),
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northeast: LatLng(maxLat, maxLong),
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),
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48.0,
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),
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);
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}
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void _onAddPlaceFabPressed() async {
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Marker newMarker = await mapController.addMarker(
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MarkerOptions(
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position: LatLng(
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mapController.cameraPosition.target.latitude,
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mapController.cameraPosition.target.longitude,
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),
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draggable: true,
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icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueGreen),
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),
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);
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setState(() {
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_pendingMarker = newMarker;
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});
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}
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void _confirmAddPlace(BuildContext context) async {
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if (_pendingMarker != null) {
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await mapController.updateMarker(
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_pendingMarker,
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MarkerOptions(
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icon: _getPlaceMarkerIcon(_selectedPlaceCategory),
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infoWindowText: InfoWindowText('New Place', null),
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draggable: false,
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),
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);
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// Store a reference to the new marker so that we can pass it to the
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// snackbar action. We cannot pass [_pendingMarker] since it will get
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// reset to null.
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Marker newMarker = _pendingMarker;
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Scaffold.of(context).showSnackBar(
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SnackBar(
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duration: Duration(seconds: 3),
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content: const Text(
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'New place added.',
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style: const TextStyle(fontSize: 16.0)
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),
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action: SnackBarAction(
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label: 'Edit',
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onPressed: () async {
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_pushPlaceDetailsScreen(newMarker);
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},
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),
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),
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);
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setState(() {
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// Create a new Place and map it to the marker we just added.
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_places[_pendingMarker] = Place(
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latLng: _pendingMarker.options.position,
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name: _pendingMarker.options.infoWindowText.title,
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category: _selectedPlaceCategory,
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);
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_pendingMarker = null;
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});
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}
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}
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void _cancelAddPlace() {
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if (_pendingMarker != null) {
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mapController.removeMarker(_pendingMarker);
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setState(() {
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_pendingMarker = null;
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});
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Row(
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crossAxisAlignment: CrossAxisAlignment.center,
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children: const <Widget>[
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Padding(
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padding: EdgeInsets.fromLTRB(0.0, 0.0, 8.0, 0.0),
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child: Icon(Icons.pin_drop, size: 24.0),
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),
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Text('Place Tracker'),
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],
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),
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backgroundColor: Colors.green[700],
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),
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// We need this additional builder here so that we can pass its context to
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// _AddPlaceButtonBar's onSavePressed callback. This callback shows a
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// SnackBar and to do this, we need a build context that has Scaffold as
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// an ancestor.
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body: Builder(builder: (BuildContext context) {
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return Center(
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child: Stack(
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children: <Widget>[
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GoogleMap(
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onMapCreated: onMapCreated,
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options: GoogleMapOptions(
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trackCameraPosition: true,
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cameraPosition: CameraPosition(
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target: widget.center,
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zoom: 11.0,
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),
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),
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),
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_CategoryButtonBar(
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selectedPlaceCategory: _selectedPlaceCategory,
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visible: _pendingMarker == null,
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onChanged: _updatePlaces,
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),
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_AddPlaceButtonBar(
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visible: _pendingMarker != null,
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onSavePressed: () => _confirmAddPlace(context),
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onCancelPressed: _cancelAddPlace,
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),
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_AddPlaceFab(
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visible: _pendingMarker == null,
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onPressed: _onAddPlaceFabPressed,
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),
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],
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),
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);
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}),
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);
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}
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}
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class _CategoryButtonBar extends StatelessWidget {
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const _CategoryButtonBar({
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Key key,
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@required this.selectedPlaceCategory,
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@required this.visible,
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@required this.onChanged,
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}) : assert(selectedPlaceCategory != null),
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assert(visible != null),
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assert(onChanged != null),
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super(key: key);
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final PlaceCategory selectedPlaceCategory;
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final bool visible;
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final ValueChanged<PlaceCategory> onChanged;
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@override
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Widget build(BuildContext context) {
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return Opacity(
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opacity: visible ? 1.0 : 0.0,
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child: Container(
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padding: const EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 14.0),
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alignment: Alignment.bottomCenter,
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child: ButtonBar(
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alignment: MainAxisAlignment.center,
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children: <Widget>[
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RaisedButton(
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color: selectedPlaceCategory == PlaceCategory.favorite
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? Colors.green[700]
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: Colors.lightGreen,
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child: const Text(
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'Favorites',
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style: TextStyle(color: Colors.white, fontSize: 14.0),
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),
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onPressed: () => onChanged(PlaceCategory.favorite),
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),
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RaisedButton(
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color: selectedPlaceCategory == PlaceCategory.visited
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? Colors.green[700]
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: Colors.lightGreen,
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child: const Text(
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'Visited',
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style: TextStyle(color: Colors.white, fontSize: 14.0),
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),
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onPressed: () => onChanged(PlaceCategory.visited),
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),
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RaisedButton(
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color: selectedPlaceCategory == PlaceCategory.wantToGo
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? Colors.green[700]
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: Colors.lightGreen,
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child: const Text(
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'Want To Go',
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style: TextStyle(color: Colors.white, fontSize: 14.0),
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),
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onPressed: () => onChanged(PlaceCategory.wantToGo),
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),
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],
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),
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),
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);
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}
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}
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class _AddPlaceButtonBar extends StatelessWidget {
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const _AddPlaceButtonBar({
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Key key,
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@required this.visible,
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@required this.onSavePressed,
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@required this.onCancelPressed,
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}) : assert(visible != null),
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assert(onSavePressed != null),
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assert(onCancelPressed != null),
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super(key: key);
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final bool visible;
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final VoidCallback onSavePressed;
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final VoidCallback onCancelPressed;
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@override
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Widget build(BuildContext context) {
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return Opacity(
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opacity: visible ? 1.0 : 0.0,
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child: Container(
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padding: const EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 14.0),
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alignment: Alignment.bottomCenter,
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child: ButtonBar(
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alignment: MainAxisAlignment.center,
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children: <Widget>[
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RaisedButton(
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color: Colors.blue,
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child: const Text(
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'Save',
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style: TextStyle(color: Colors.white, fontSize: 16.0),
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),
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onPressed: onSavePressed,
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),
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RaisedButton(
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color: Colors.red,
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child: const Text(
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'Cancel',
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style: TextStyle(color: Colors.white, fontSize: 16.0),
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),
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onPressed: onCancelPressed,
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),
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],
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),
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),
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);
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}
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}
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class _AddPlaceFab extends StatelessWidget {
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const _AddPlaceFab({
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Key key,
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@required this.visible,
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@required this.onPressed,
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}) : assert(visible != null),
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assert(onPressed != null),
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super(key: key);
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final bool visible;
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final VoidCallback onPressed;
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@override
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Widget build(BuildContext context) {
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return Opacity(
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opacity: visible ? 1.0 : 0.0,
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child: Padding(
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padding: const EdgeInsets.all(16.0),
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child: Align(
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alignment: Alignment.topRight,
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child: FloatingActionButton(
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onPressed: onPressed,
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materialTapTargetSize: MaterialTapTargetSize.padded,
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backgroundColor: Colors.green,
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child: const Icon(Icons.add_location, size: 36.0),
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),
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),
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),
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);
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}
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}
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