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Published 3 years ago Dart 3 compatible
SDKFlutter
PlatformiOS
→

Metadata

Apple Maps for Flutter.

More...

example/lib/main.dart

import 'dart:collection';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'dart:math';

import 'package:apple_maps/apple_maps.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Apple Maps example'),
          ),
          body: PlaceAnnotationClusteredBody()),
    );
  }
}

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];

class PlaceAnnotationClusteredBody extends StatefulWidget {
  const PlaceAnnotationClusteredBody();

  @override
  State<StatefulWidget> createState() => PlaceAnnotationClusteredBodyState();
}

class PlaceAnnotationClusteredBodyState extends State<PlaceAnnotationClusteredBody> {
  PlaceAnnotationClusteredBodyState();
  static final LatLng center = const LatLng(-33.86711, 151.1947171);

  AppleMapsController? controller;

  void _onMapCreated(AppleMapsController controller) {
    this.controller = controller;
  }

  final Random _rng = Random();

  late BatchPinImageProcessorAnnotation _processor;

  final Set<String> markerIds = HashSet();

  @override
  void initState() {
    super.initState();
    _processor = BatchPinImageProcessorAnnotation(
        batchSize: 4,
        onBatchFinished: (list) {
          print("finished batch");
          markerIds.addAll(list.map((e) => e.id));
          controller?.addMarkers(list);
        },
        onPinSelect: (p) => print(p.url));
  }

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: <Widget>[
          Expanded(
            child: Container(
              child: AppleMap(
                onMapCreated: _onMapCreated,
                onCameraIdle: (bounds) {
                  print("idle camera $bounds");
                },
                onMarkerSelected: (id) {
                  print("Selected: $id");
                },
                initialCameraPosition: CameraPosition(
                  target: center,
                  zoom: 12,
                ),
              ),
            ),
          ),
          TextButton(
            child: const Text('add markers'),
            onPressed: () {
              final pins = imagesToLoad.map((s) {
                // _annotationIdCounter++;
                final end = 0.005;
                final start = 0.05;
                final randlat = _rng.nextDouble() * (end - start) + start;
                final randlng = _rng.nextDouble() * (end - start) + start;
                return Pin(s, LatLng(center.latitude - randlat, center.longitude + randlng));
              }).toList();
              _processor.process(pins);
            },
          ),
          TextButton(
            child: const Text('delete random half of markers'),
            onPressed: () {
              controller?.removeMarkers(markerIds.take(markerIds.length ~/ 2).toList().map((e) {
                markerIds.remove(e);
                return e;
              }).toList());
            },
          ),
        ]);
  }
}

abstract class BatchProcessor<T, R> {
  final Function(List<R>) onBatchFinished;

  BatchProcessor(this.onBatchFinished);

  void process(List<T> items);
}

abstract class BaseBatchProcessor<T, R> implements BatchProcessor<T, R> {
  int get batchSize;
  Function(List<R>) get onBatchFinished;

  List<T> _makeBatch(Queue<T> queue, int batchSizeUsed) {
    final List<T> currentBatch = [];
    while (currentBatch.length < batchSizeUsed && queue.isNotEmpty) {
      currentBatch.add(queue.removeFirst());
    }
    return currentBatch;
  }

  Future<List<R>?> processBatch(List<T> batch);

  int determineBatchSize(List<T> items) {
    return batchSize;
  }

  @override
  void process(List<T> items) async {
    if (items.isEmpty) return;
    final int batchSize = determineBatchSize(items);
    final Queue<T> itemsQueue = Queue.from(items);
    while (itemsQueue.isNotEmpty) {
      final batch = _makeBatch(itemsQueue, batchSize);
      final results = await processBatch(batch);
      if (results != null) onBatchFinished(results);
    }
  }
}

class Pin {
  final String url;
  final LatLng position;
  Uint8List? icon;

  Pin(this.url, this.position);
}

class BatchPinImageProcessorAnnotation extends BaseBatchProcessor<Pin, FlutterMarker> {
  final int batchSize;
  final Function(List<FlutterMarker>) onBatchFinished;
  final Function(Pin) onPinSelect;

  BatchPinImageProcessorAnnotation({required this.batchSize, required this.onBatchFinished, required this.onPinSelect});

  final HttpClient _httpClient = HttpClient();

  @override
  Future<List<FlutterMarker>?> processBatch(List<Pin> batch) async {
    return Future.wait(batch.map((p) => _futureForPin(p).catchError((_) => null)))
        .then((unfilteredList) => unfilteredList.where((e) => e != null).map((e) => e!).toList());
  }

  Future<FlutterMarker?> _futureForPin(Pin pin) async {
    try {
      var request = await _httpClient.getUrl(Uri.parse(pin.url));
      var response = await request.close();
      // handle invalid/empty pin icons
      if (response.statusCode == 200) {
        pin.icon = await consolidateHttpClientResponseBytes(response);
      } else {
        pin.icon = null;
      }
    } catch (_) {
      pin.icon = null;
    }
    return _markerForPin(pin);
  }

  final _chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';
  Random _rnd = Random();

  String getRandomString(int length) =>
      String.fromCharCodes(Iterable.generate(length, (_) => _chars.codeUnitAt(_rnd.nextInt(_chars.length))));

  FlutterMarker? _markerForPin(Pin pin) {
    if (pin.icon == null) return null;
    return FlutterMarker(pin.url, pin.icon!, pin.position);
  }
}

← Metadata

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popularity

Publisher

unverified uploader

Metadata

Apple Maps for Flutter.

Homepage

Documentation

API reference

License

MIT (LICENSE)

Dependencies

flutter

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