flutter_map_tile_caching 4.0.0-dev.7 
flutter_map_tile_caching: ^4.0.0-dev.7 copied to clipboard
jaffaketchup.devPlugin for 'flutter_map' providing advanced caching functionality, with ability to download map regions for offline use. Also includes useful prebuilt widgets.
//! TODO: Add 'flutter_map', 'flutter_map_tile_caching' & 'sliding_up_panel' to pubspec.yaml
//! TODO: Follow main installation instructions (/ see below)
// It is not recommended to copy UI components directly from here, especially if performance matters. I'm spending more time on the actual library than the example: therefore it is likely to have bugs/weird behaviour/performance issues. These are usually not reflective of the library itself.
// TESTED WITH FOLLOWING BUILD SDK VERSIONS:
// compileSdkVersion = 31
// targetSdkVersion = 29
// minSdkVersion = 23
import 'dart:async';
import 'dart:io';
import 'dart:ui';
import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import 'package:sliding_up_panel/sliding_up_panel.dart';
import 'package:flutter_map_tile_caching/flutter_map_tile_caching.dart';
void main() {
runApp(DemoApp());
}
class DemoApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'flutter_map_tile_caching Demo',
home: MapScreen(),
theme: ThemeData(
primarySwatch: Colors.green,
),
debugShowCheckedModeBanner: false,
);
}
}
class MapScreen extends StatefulWidget {
@override
_MapScreenState createState() => _MapScreenState();
}
class _MapScreenState extends State<MapScreen> {
late final MapController mapController;
late final PanelController panelController;
late final TextEditingController newStoreInputController;
late TextEditingController renameStoreInputController;
late TextEditingController maxZoomInputController;
late TextEditingController minZoomInputController;
final Duration animationDuration = Duration(milliseconds: 250);
final Duration animationDurationSlow = Duration(milliseconds: 500);
final Curve animationCurve = Curves.easeInOut;
bool forceUseCellular = false;
bool lockRotation = true;
StreamController<Null> resetController = StreamController.broadcast();
String? storeName;
bool renaming = false;
double panelUIOpacity = 0;
RegionType? selectingDownloadRegion;
List<LatLng> prevTappedLocations = [];
List<LatLng> tappedLocations = [];
double lineWidthSelected = 500;
bool lineReady = false;
bool lockPreventRedownload = false;
bool enablePreventRedownload = false;
bool enableSeaTileRemoval = true;
int prevMinZoom = -1;
int prevMaxZoom = -1;
int prevEstTiles = -1;
int minZoom = 1;
int maxZoom = 18;
bool downloadInProgress = false;
bool downloadJustFinished = false;
bool downloadingInBackground = false;
bool cancelBackgroundFlag = false;
double percentageComplete = 0;
String durationElapsed = '';
String estRemainingDuration = '';
String successfulTiles = '0';
String failedTiles = '0';
StorageCachingTileProvider? downloadProvider;
void newStoreNameSubmitted(
String _storeName,
CacheDirectory parentDirectory,
) {
if (renaming)
MapCachingManager(parentDirectory, storeName!).renameStore(_storeName);
setState(() {
storeName = _storeName.trim();
renameStoreInputController = TextEditingController(text: storeName!);
renaming = false;
resetController.add(null);
});
final RecoveredRegion? recovered = StorageCachingTileProvider(
parentDirectory: parentDirectory, storeName: storeName!)
.recoverDownload();
if (recovered == null) return;
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Found an incomplete download'),
action: recovered.type == RegionType.line
? null
: SnackBarAction(
label: 'Recover It',
onPressed: () {
if (recovered.type == RegionType.rectangle) {
setState(() {
tappedLocations = [
recovered.bounds!.northWest,
recovered.bounds!.southEast,
];
selectingDownloadRegion = RegionType.rectangle;
});
} else {
setState(() {
tappedLocations = [
recovered.center!,
Distance()
.offset(recovered.center!, recovered.radius!, 0),
];
selectingDownloadRegion = RegionType.circle;
});
}
setState(() {
minZoomInputController.text = recovered.minZoom.toString();
maxZoomInputController.text = recovered.maxZoom.toString();
enablePreventRedownload = recovered.preventRedownload;
enableSeaTileRemoval = recovered.seaTileRemoval;
lockPreventRedownload = true;
downloadInProgress = false;
});
}),
duration: Duration(seconds: 10),
),
);
}
void startDownload(CacheDirectory parentDirectory, DownloadableRegion region,
{bool background = false, bool noRecovery = false}) async {
setState(() {
downloadInProgress = true;
selectingDownloadRegion = null;
downloadProvider = StorageCachingTileProvider(
parentDirectory: parentDirectory,
storeName: storeName!,
);
});
if (background) {
setState(() {
downloadingInBackground = true;
});
try {
downloadProvider!.downloadRegionBackground(
region,
downloadProvider!,
preDownloadChecksCallback: (c, b, s) async {
if ((b! > 15 || s == ChargingStatus.Charging) &&
(c == ConnectivityResult.wifi ||
c == ConnectivityResult.ethernet)) return true;
if (c == ConnectivityResult.none) return false;
return await showDialog(
context: context,
builder: (BuildContext context) => AlertDialog(
title: Text('Careful!'),
content: SingleChildScrollView(
child: Text(
'One or more of the pre-download checks failed! It could be because either:\n - Your battery is below 15% and not charging\n - You are connected to the Internet through cellular/mobile data\n\nPlease check whether you want to continue.',
),
),
actions: [
TextButton(
onPressed: () => Navigator.of(context).pop(true),
child: Text('Continue'),
),
TextButton(
onPressed: () => Navigator.of(context).pop(false),
child: Text('Cancel'),
),
],
),
);
},
preDownloadChecksFailedCallback: () {
setState(() {
downloadInProgress = false;
downloadJustFinished = false;
selectingDownloadRegion = null;
prevTappedLocations = [];
tappedLocations = [];
successfulTiles = '0';
failedTiles = '0';
durationElapsed = '0:00:00';
estRemainingDuration = '0:00:00';
percentageComplete = 0;
lockPreventRedownload = false;
});
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('Failed to meet the pre-download checks')),
);
return;
},
callback: (DownloadProgress progress) {
setState(() {
percentageComplete = progress.percentageProgress;
durationElapsed = progress.duration.toString().split('.')[0];
estRemainingDuration =
progress.estRemainingDuration.toString().split('.')[0];
successfulTiles = progress.successfulTiles.toString();
failedTiles = progress.failedTiles.length.toString();
if (progress.percentageProgress == 100) {
downloadJustFinished = true;
downloadingInBackground = false;
}
});
if (cancelBackgroundFlag) {
setState(() {
cancelBackgroundFlag = false;
downloadingInBackground = false;
});
return true;
}
return false;
},
useAltMethod: true,
);
} catch (e) {
if (e is StateError) {
setState(() {
downloadInProgress = false;
});
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content:
Text('An error occurred:\nFailed to create recovery session'),
),
);
}
rethrow;
}
} else {
late final Stream<DownloadProgress> downloadStream;
try {
downloadStream = downloadProvider!.downloadRegion(
region,
disableRecovery: noRecovery,
preDownloadChecksCallback: (c, b, s) async {
if ((b! > 15 || s == ChargingStatus.Charging) &&
(c == ConnectivityResult.wifi ||
c == ConnectivityResult.ethernet)) return true;
if (c == ConnectivityResult.none) return false;
return await showDialog(
context: context,
builder: (BuildContext context) => AlertDialog(
title: Text('Careful!'),
content: SingleChildScrollView(
child: Text(
'One or more of the pre-download checks failed! It could be because either:\n - Your battery is below 15% and not charging\n - You are connected to the Internet through cellular/mobile data\n\nPlease check whether you want to continue.',
),
),
actions: [
TextButton(
onPressed: () => Navigator.of(context).pop(true),
child: Text('Continue'),
),
TextButton(
onPressed: () => Navigator.of(context).pop(false),
child: Text('Cancel'),
),
],
),
);
},
).asBroadcastStream();
if (await downloadStream.isEmpty) {
setState(() {
downloadInProgress = false;
downloadJustFinished = false;
selectingDownloadRegion = null;
prevTappedLocations = [];
tappedLocations = [];
successfulTiles = '0';
failedTiles = '0';
durationElapsed = '0:00:00';
estRemainingDuration = '0:00:00';
percentageComplete = 0;
lockPreventRedownload = false;
});
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('Failed to meet the pre-download checks')),
);
return;
}
} catch (e) {
if (e is StateError) {
setState(() {
downloadInProgress = false;
});
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content:
Text('An error occurred:\nFailed to create recovery session'),
action: SnackBarAction(
label: 'Retry Without Recovery',
onPressed: () {
startDownload(
parentDirectory,
region,
background: background,
noRecovery: true,
);
},
),
),
);
}
rethrow;
}
downloadStream.listen((progress) {
setState(() {
percentageComplete = progress.percentageProgress;
durationElapsed = progress.duration.toString().split('.')[0];
estRemainingDuration =
progress.estRemainingDuration.toString().split('.')[0];
successfulTiles = progress.successfulTiles.toString();
failedTiles = progress.failedTiles.length.toString();
if (progress.percentageProgress == 100) {
downloadJustFinished = true;
}
});
});
}
}
@override
void initState() {
mapController = MapController();
panelController = PanelController();
newStoreInputController = TextEditingController();
maxZoomInputController = TextEditingController()..text = '18';
minZoomInputController = TextEditingController()..text = '1';
WidgetsBinding.instance!.addPostFrameCallback((_) async {
await showDialog(
context: context,
builder: (BuildContext context) => AlertDialog(
title: Text('Important Notice'),
content: SingleChildScrollView(
child: Text(
'By using this application, you agree to/view these rules/terms:\n\n - OpenStreetMaps\' Tile Server Usage Policy, available at https://operations.osmfoundation.org/policies/tiles/\n - This application must not be used except for testing the library and finding new features to use in your own app: ie. do not distribute\n - You agree to the licenses of all third-party dependencies; a list of dependencies is available at https://pub.dev/packages/flutter_map_tile_caching\n\n - This application may not be indicative of the performance of the library: always test performance using your own build\n - It is not recommended to directly copy UI elements from this application: I\'m spending more time on the actual library than the example: therefore it is likely to have bugs/weird behaviour/performance issues. These are usually not reflective of the library itself.',
),
),
actions: [
TextButton(
onPressed: () => Navigator.of(context).pop(),
child: Text('OK'),
),
],
),
);
});
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('flutter_map_tile_caching Demo'),
),
body: FutureBuilder<CacheDirectory>(
future: MapCachingManager.normalCache,
builder: (context, dir) {
if (dir.data == null)
return Center(
child: CircularProgressIndicator(),
);
final TileLayerOptions tileLayerOptions = TileLayerOptions(
urlTemplate: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
subdomains: ['a', 'b', 'c'],
tileProvider: storeName == null
? NonCachingNetworkTileProvider()
: StorageCachingTileProvider(
parentDirectory: dir.data!,
storeName: storeName!,
),
maxNativeZoom: 18,
maxZoom: 22,
reset: resetController.stream,
);
return SlidingUpPanel(
controller: panelController,
onPanelSlide: (num) => setState(() {
panelUIOpacity = num;
}),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(24),
topRight: Radius.circular(24),
),
backdropEnabled: true,
panel: Padding(
padding: const EdgeInsets.only(left: 10, right: 10),
child: Stack(
alignment: Alignment.center,
children: [
Column(
mainAxisSize: MainAxisSize.max,
children: [
SizedBox(height: 8),
Container(
height: 5,
width: MediaQuery.of(context).size.width / 4,
decoration: BoxDecoration(
color: Colors.black,
borderRadius: BorderRadius.all(Radius.circular(5)),
),
),
SizedBox(
height: 80,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
'Cache Manager',
style: TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold,
),
),
SizedBox(height: 11),
],
),
),
],
),
Opacity(
opacity: 1,
child: Column(
mainAxisSize: MainAxisSize.max,
children: [
SizedBox(
height: 100,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: [
SizedBox(height: 35),
Visibility(
visible: storeName == null,
child: Opacity(
opacity: 1 - panelUIOpacity,
child: Text('No cache chosen'),
),
),
Visibility(
visible: storeName != null,
child: Text('Caching to: $storeName'),
),
],
),
),
],
),
),
Opacity(
opacity: panelUIOpacity,
child: Column(
children: [
SizedBox(height: 100),
Expanded(
child: storeName == null || renaming
? Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(
!renaming
? Icons.file_download_off
: Icons.edit,
size: 56,
),
SizedBox(height: 6),
Text(
renaming
? 'Enter a new name for the store:'
: 'You aren\'t caching anything yet\nGet started by choosing a name:',
style: TextStyle(
fontSize: 20,
),
textAlign: TextAlign.center,
),
SizedBox(height: 10),
Padding(
padding:
EdgeInsets.only(left: 15, right: 15),
child: TextField(
controller: newStoreInputController,
maxLengthEnforcement:
MaxLengthEnforcement.none,
maxLength: 40,
textCapitalization:
TextCapitalization.words,
decoration: InputDecoration(
hintText: renaming ? null : 'London',
helperText: renaming
? 'Enter the new name for the store \'$storeName\''
: 'Enter the name of a new or existing store',
suffixIcon: IconButton(
onPressed: newStoreInputController
.text ==
''
? null
: () => newStoreNameSubmitted(
newStoreInputController
.text,
dir.data!,
),
icon: Icon(Icons.arrow_forward),
),
),
onSubmitted: (String str) => str != ''
? newStoreNameSubmitted(
str, dir.data!)
: null,
onChanged: (_) => setState(() {}),
textAlignVertical:
TextAlignVertical.center,
),
),
],
)
: Column(
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Column(
children: [
Text(
(MapCachingManager(
dir.data!,
storeName!,
)
.storeSize
?.bytesToMegabytes ??
0)
.toStringAsFixed(2) +
' MB',
style: TextStyle(
fontSize: 30,
fontWeight: FontWeight.bold,
),
),
Text(
'Total Size',
style: TextStyle(
fontSize: 18,
),
),
],
),
Column(
children: [
Text(
(MapCachingManager(
dir.data!,
storeName!,
).storeLength ??
0)
.toString(),
style: TextStyle(
fontSize: 30,
fontWeight: FontWeight.bold,
),
),
Text(
'Total Tiles',
style: TextStyle(
fontSize: 18,
),
),
],
),
Column(
children: [
Text(
((((MapCachingManager(
dir.data!,
storeName!,
).storeSize ??
0) /
1024) /
(MapCachingManager(
dir.data!,
storeName!,
).storeLength ??
0))
.isNaN
? 0
: (((MapCachingManager(
dir.data!,
storeName!,
).storeSize ??
0) /
1024) /
(MapCachingManager(
dir.data!,
storeName!,
).storeLength ??
0)))
.toStringAsFixed(2) +
' KB',
style: TextStyle(
fontSize: 30,
fontWeight: FontWeight.bold,
),
),
Text(
'Avg. Tile Size',
style: TextStyle(
fontSize: 18,
),
),
],
),
],
),
SizedBox(height: 10),
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Expanded(
child: OutlinedButton(
onPressed: downloadInProgress &&
!downloadJustFinished
? null
: () {
setState(() {
renaming = true;
});
},
child: Text('Rename'),
),
),
SizedBox(width: 5),
Expanded(
child: OutlinedButton(
onPressed: downloadInProgress &&
!downloadJustFinished
? null
: () {
setState(() {
MapCachingManager(
dir.data!,
storeName!,
).deleteStore();
storeName = null;
});
},
child: Text('Delete'),
),
),
SizedBox(width: 15),
Expanded(
child: OutlinedButton(
onPressed: downloadInProgress &&
!downloadJustFinished
? null
: () {
setState(() {
storeName = null;
});
},
child: Text('Disable'),
),
),
],
),
SizedBox(height: 30),
Visibility(
visible:
selectingDownloadRegion == null &&
!downloadInProgress,
child: Column(
children: [
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
selectingDownloadRegion =
RegionType.rectangle;
});
},
child: Text(
'Download Rectangular Region'),
),
),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
selectingDownloadRegion =
RegionType.circle;
});
},
child: Text(
'Download Circular Region'),
),
),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
selectingDownloadRegion =
RegionType.line;
});
},
child: Text(
'Download Line-Based Region'),
),
),
],
),
),
Visibility(
visible:
selectingDownloadRegion != null &&
(tappedLocations.length < 2 ||
(selectingDownloadRegion ==
RegionType.line &&
!lineReady)),
child: Column(
children: [
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
selectingDownloadRegion =
null;
tappedLocations = [];
});
},
child: Text('Cancel'),
),
),
SizedBox(height: 10),
Row(
children: [
Icon(
Icons.touch_app,
size: 32,
),
SizedBox(width: 10),
Expanded(
child: Text(
selectingDownloadRegion ==
RegionType.rectangle
? 'To select a rectangular area to download, tap on the top-left and bottom-right of the area in that order. Alternatively, cancel the selection above.'
: selectingDownloadRegion ==
RegionType.circle
? 'To select a circular area to download, tap on the center of the circle, then on the edge of the circle. Alternatively, cancel the selection above.'
: 'To select a line-based area to download, tap on each corner of the line in turn. Then choose a width using the slider below, and tap \'Done\'. Alternatively, cancel the selection above.',
textAlign: TextAlign.center,
),
),
],
),
Visibility(
visible: selectingDownloadRegion ==
RegionType.line,
child: Column(
children: [
Slider(
value: lineWidthSelected,
onChanged: (double newVal) =>
setState(() =>
lineWidthSelected =
newVal),
min: 500,
max: 2000,
label: lineWidthSelected
.toStringAsFixed(0) +
'm',
divisions: 300,
),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
lineReady = true;
});
},
child: Text('Done'),
),
),
],
),
),
],
),
),
Visibility(
visible:
selectingDownloadRegion != null &&
tappedLocations.length >= 2 &&
(selectingDownloadRegion !=
RegionType.line ||
lineReady),
child: Column(
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Column(
children: [
FutureBuilder<int>(
future: minZoom > maxZoom
? Future.sync(() => -1)
: selectingDownloadRegion !=
null &&
tappedLocations.length >=
2 &&
(selectingDownloadRegion !=
RegionType
.line ||
lineReady)
? minZoom !=
prevMinZoom ||
maxZoom !=
prevMaxZoom ||
!ListEquality().equals(
tappedLocations,
prevTappedLocations)
? (tappedLocations
.length ==
2
? StorageCachingTileProvider
.checkRegion(
selectingDownloadRegion ==
RegionType.rectangle
? RectangleRegion(
LatLngBounds(tappedLocations[0], tappedLocations[1]),
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
)
: selectingDownloadRegion == RegionType.circle
? CircleRegion(
tappedLocations[0],
Distance().distance(tappedLocations[0], tappedLocations[1]) / 1000,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
)
: LineRegion(
tappedLocations,
lineWidthSelected,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
),
)
: Future.sync(
() =>
0))
: Future.sync(() =>
prevEstTiles)
: Future.sync(
() => 0),
builder:
(context, tilesLength) {
if (!tilesLength
.hasData ||
tilesLength
.connectionState !=
ConnectionState
.done) {
if (prevEstTiles ==
-1 ||
minZoom !=
prevMinZoom ||
maxZoom !=
prevMaxZoom ||
!ListEquality().equals(
tappedLocations,
prevTappedLocations))
return CircularProgressIndicator();
return Text(
prevEstTiles
.toString(),
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
);
}
prevMinZoom = minZoom;
prevMaxZoom = maxZoom;
prevEstTiles =
tilesLength.data!;
prevTappedLocations =
tappedLocations;
return Text(
tilesLength.data
.toString(),
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
);
},
),
Text(
'Estimated Tiles',
style: TextStyle(
fontSize: 18,
),
),
],
),
Column(
crossAxisAlignment:
CrossAxisAlignment.end,
children: [
Row(
children: [
SizedBox(
height: 20,
child: Switch(
value:
enablePreventRedownload,
onChanged: lockPreventRedownload
? null
: (bool newVal) =>
setState(() =>
enablePreventRedownload =
newVal),
),
),
Text('Prevent Redownload')
],
),
Row(
mainAxisAlignment:
MainAxisAlignment
.spaceBetween,
children: [
SizedBox(
height: 20,
child: Switch(
value:
enableSeaTileRemoval,
onChanged: (bool
newVal) =>
setState(() =>
enableSeaTileRemoval =
newVal),
),
),
SizedBox(width: 21),
Text('Sea Tile Removal')
],
),
],
),
],
),
SizedBox(height: 10),
Row(
children: [
Expanded(
child: TextField(
controller:
minZoomInputController,
keyboardType: TextInputType
.numberWithOptions(),
inputFormatters: [
FilteringTextInputFormatter
.digitsOnly,
NumericalRangeFormatter(
min: 1, max: 22),
],
decoration: InputDecoration(
hintText: '1',
labelText: 'Minimum Zoom',
),
onChanged: (String newZoom) {
if (newZoom == '') return;
setState(() {
minZoom =
int.parse(newZoom);
});
},
textAlignVertical:
TextAlignVertical.center,
textAlign: TextAlign.start,
),
),
SizedBox(width: 10),
Expanded(
child: TextField(
controller:
maxZoomInputController,
keyboardType:
TextInputType.number,
inputFormatters: [
FilteringTextInputFormatter
.digitsOnly,
NumericalRangeFormatter(
min: 1, max: 22),
],
decoration: InputDecoration(
hintText: '18',
labelText: 'Maximum Zoom',
),
onChanged: (String newZoom) {
if (newZoom == '') return;
setState(() {
maxZoom =
int.parse(newZoom);
});
},
textAlignVertical:
TextAlignVertical.center,
textAlign: TextAlign.end,
),
),
],
),
SizedBox(height: 10),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: () {
setState(() {
selectingDownloadRegion =
null;
tappedLocations = [];
lineReady = false;
});
},
child: Text('Cancel'),
),
),
SizedBox(
width: double.infinity,
child: Row(
children: [
Expanded(
flex: 3,
child: OutlinedButton(
onPressed: () {
startDownload(
dir.data!,
selectingDownloadRegion ==
RegionType
.rectangle
? RectangleRegion(
LatLngBounds(
tappedLocations[
0],
tappedLocations[
1]),
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload:
enablePreventRedownload,
seaTileRemoval:
enableSeaTileRemoval,
parallelThreads:
2,
)
: selectingDownloadRegion ==
RegionType
.circle
? CircleRegion(
tappedLocations[
0],
Distance().distance(
tappedLocations[0],
tappedLocations[1]) /
1000,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload:
enablePreventRedownload,
seaTileRemoval:
enableSeaTileRemoval,
parallelThreads:
2,
)
: LineRegion(
tappedLocations,
lineWidthSelected,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload:
enablePreventRedownload,
seaTileRemoval:
enableSeaTileRemoval,
parallelThreads:
2,
),
);
},
child:
Text('Start Download'),
),
),
SizedBox(width: 5),
Expanded(
flex: 2,
child: OutlinedButton(
onPressed:
Platform.isAndroid
? () {
StorageCachingTileProvider
.requestIgnoreBatteryOptimizations(
context);
startDownload(
dir.data!,
selectingDownloadRegion ==
RegionType
.rectangle
? RectangleRegion(
LatLngBounds(
tappedLocations[0],
tappedLocations[1]),
)
.toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload:
enablePreventRedownload,
seaTileRemoval:
enableSeaTileRemoval,
parallelThreads:
2,
)
: selectingDownloadRegion ==
RegionType.circle
? CircleRegion(
tappedLocations[0],
Distance().distance(tappedLocations[0], tappedLocations[1]) / 1000,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload: enablePreventRedownload,
seaTileRemoval: enableSeaTileRemoval,
parallelThreads: 2,
)
: LineRegion(
tappedLocations,
lineWidthSelected,
).toDownloadable(
minZoom,
maxZoom,
tileLayerOptions,
preventRedownload: enablePreventRedownload,
seaTileRemoval: enableSeaTileRemoval,
parallelThreads: 2,
),
background:
true,
);
}
: null,
child:
Text('In Background'),
),
),
],
),
),
],
),
),
Visibility(
visible: downloadInProgress &&
percentageComplete != 0,
child: Column(
children: [
Visibility(
visible: !downloadJustFinished,
child: Column(
children: [
LinearProgressIndicator(
value:
percentageComplete / 100,
),
SizedBox(height: 10),
Row(
mainAxisAlignment:
MainAxisAlignment
.spaceEvenly,
children: [
Column(
children: [
Text(
(int.parse(successfulTiles) +
int.parse(
failedTiles))
.toString(),
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
Text(
'Complete',
style: TextStyle(
fontSize: 18,
),
textAlign:
TextAlign.center,
),
],
),
Column(
children: [
Text(
successfulTiles,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
Text(
'Successful',
style: TextStyle(
fontSize: 18,
),
textAlign:
TextAlign.center,
),
],
),
Column(
children: [
Text(
failedTiles,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
color:
failedTiles !=
'0'
? Colors.red
: null,
),
),
Text(
'Failed',
style: TextStyle(
fontSize: 18,
color:
failedTiles !=
'0'
? Colors.red
: null,
),
textAlign:
TextAlign.center,
),
],
),
],
),
SizedBox(height: 10),
Row(
mainAxisAlignment:
MainAxisAlignment
.spaceEvenly,
children: [
Column(
children: [
Text(
durationElapsed,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
Text(
'Elapsed Duration',
style: TextStyle(
fontSize: 18,
),
textAlign:
TextAlign.center,
),
],
),
Column(
children: [
Text(
estRemainingDuration,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
Text(
'Remaining Duration',
style: TextStyle(
fontSize: 18,
),
textAlign:
TextAlign.center,
),
],
),
],
),
],
),
),
Visibility(
visible: downloadJustFinished,
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
Icon(
percentageComplete == 100
? Icons.done_all
: Icons.cancel_outlined,
color:
percentageComplete == 100
? Colors.green
: Colors.red,
size: 56,
),
SizedBox(width: 40),
Column(
crossAxisAlignment:
CrossAxisAlignment.end,
children: [
Text(
successfulTiles,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
Text(
percentageComplete == 100
? failedTiles
: (percentageComplete
.toStringAsFixed(
2) +
'%'),
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
color: failedTiles !=
'0' &&
percentageComplete ==
100
? Colors.red
: null,
),
),
Text(
durationElapsed,
style: TextStyle(
fontSize: 30,
fontWeight:
FontWeight.bold,
),
),
],
),
SizedBox(width: 20),
Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text('successful\ntiles'),
SizedBox(height: 3),
Text(
percentageComplete == 100
? 'failed\ntiles'
: 'completed\npercentage',
style: TextStyle(
color: failedTiles !=
'0' &&
percentageComplete ==
100
? Colors.red
: null,
),
),
SizedBox(height: 3),
Text('total\nduration'),
],
),
],
),
),
SizedBox(height: 20),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: downloadJustFinished
? null
: () {
if (downloadingInBackground)
cancelBackgroundFlag =
true;
else
downloadProvider!
.cancelDownload();
setState(() {
downloadJustFinished =
true;
});
},
child: Text('Cancel'),
),
),
SizedBox(
width: double.infinity,
child: OutlinedButton(
onPressed: !downloadJustFinished
? null
: () {
setState(() {
downloadInProgress =
false;
downloadJustFinished =
false;
selectingDownloadRegion =
null;
prevTappedLocations =
[];
tappedLocations = [];
successfulTiles = '0';
failedTiles = '0';
durationElapsed =
'0:00:00';
estRemainingDuration =
'0:00:00';
percentageComplete = 0;
lockPreventRedownload =
false;
});
},
child: Text('Reset'),
),
),
],
),
),
Visibility(
visible: downloadInProgress &&
percentageComplete == 0,
child: Column(
mainAxisAlignment:
MainAxisAlignment.center,
children: [
CircularProgressIndicator(),
SizedBox(height: 10),
Text(
'Preparing Your Download\nPlease Bear With Us',
textAlign: TextAlign.center,
),
],
),
),
],
),
),
],
),
),
],
),
),
body: Stack(
children: [
FlutterMap(
mapController: mapController,
options: MapOptions(
center: LatLng(51.50497044472158, -0.6690676698303173),
zoom: 13.0,
interactiveFlags: lockRotation
? InteractiveFlag.all & ~InteractiveFlag.rotate
: InteractiveFlag.all,
onTap: (_, LatLng location) {
if (selectingDownloadRegion != null) {
setState(() {
tappedLocations.add(location);
});
if (tappedLocations.length == 1 ||
selectingDownloadRegion == RegionType.line) return;
panelController.open();
}
},
),
children: <Widget>[
TileLayerWidget(
options: tileLayerOptions,
),
PolygonLayerWidget(
options: selectingDownloadRegion == null ||
tappedLocations.length < 2 &&
!(downloadInProgress || downloadJustFinished)
? PolygonLayerOptions()
: selectingDownloadRegion == RegionType.rectangle
? RectangleRegion(
LatLngBounds(
tappedLocations[0], tappedLocations[1]),
).toDrawable(
Colors.green.withAlpha(128),
Colors.green,
)
: selectingDownloadRegion == RegionType.circle
? CircleRegion(
tappedLocations[0],
Distance().distance(tappedLocations[0],
tappedLocations[1]) /
1000,
).toDrawable(
Colors.green.withAlpha(128),
Colors.green,
)
: LineRegion(
tappedLocations,
lineWidthSelected,
).toDrawable(
Colors.green.withAlpha(128),
Colors.green,
),
),
],
),
FutureBuilder(
future: mapController.onReady,
builder: (context, _) {
return StreamBuilder(
stream: mapController.mapEventStream,
builder: (context, snapshot) {
return Stack(
children: [
AnimatedPositioned(
duration: animationDurationSlow,
curve: animationCurve,
right: mapController.rotation == 0 ? -48 : 0,
top: 48,
child: IgnorePointer(
ignoring: mapController.rotation == 0,
child: AnimatedOpacity(
duration: animationDuration,
curve: animationCurve,
opacity: mapController.rotation == 0 ? 0 : 1,
child: FloatingActionButton(
mini: true,
onPressed: () => mapController.rotate(0),
child: Icon(Icons.north),
tooltip: 'North Up',
),
),
),
),
Positioned(
right: 0,
child: FloatingActionButton(
mini: true,
onPressed: () => setState(
() => lockRotation = !lockRotation),
child: Icon(
lockRotation
? Icons.screen_lock_rotation
: Icons.screen_rotation,
),
tooltip: 'Lock Rotation',
),
),
AnimatedPositioned(
duration: animationDurationSlow,
curve: animationCurve,
right: tappedLocations.length != 2 ||
selectingDownloadRegion == RegionType.line
? -48
: 0,
top: mapController.rotation == 0 ? 48 : 96,
child: IgnorePointer(
ignoring: tappedLocations.length != 2,
child: AnimatedOpacity(
duration: animationDuration,
curve: animationCurve,
opacity: tappedLocations.length != 2 ? 0 : 1,
child: FloatingActionButton(
mini: true,
onPressed: () {
mapController.rotate(0);
if (selectingDownloadRegion ==
RegionType.circle)
mapController.fitBounds(
LatLngBounds(
_moveByBottomPadding(
LatLng(
Distance()
.offset(
tappedLocations[0],
Distance().distance(
tappedLocations[0],
tappedLocations[1]),
0,
)
.latitude,
Distance()
.offset(
tappedLocations[0],
Distance().distance(
tappedLocations[0],
tappedLocations[1]),
270,
)
.longitude,
),
mapController.zoom,
100,
),
_moveByBottomPadding(
LatLng(
Distance()
.offset(
tappedLocations[0],
Distance().distance(
tappedLocations[0],
tappedLocations[1]),
180,
)
.latitude,
Distance()
.offset(
tappedLocations[0],
Distance().distance(
tappedLocations[0],
tappedLocations[1]),
90,
)
.longitude,
),
mapController.zoom,
100,
),
),
);
else
mapController.fitBounds(
LatLngBounds(
_moveByBottomPadding(
tappedLocations[0],
mapController.zoom,
100,
),
_moveByBottomPadding(
tappedLocations[1],
mapController.zoom,
100,
),
),
);
},
child: Icon(Icons.center_focus_strong),
tooltip: 'Focus On Region',
),
),
),
),
],
);
},
);
},
),
],
),
);
},
),
);
}
}
class NumericalRangeFormatter extends TextInputFormatter {
final double min;
final double max;
NumericalRangeFormatter({required this.min, required this.max});
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue,
TextEditingValue newValue,
) {
if (newValue.text == '')
return newValue;
else if (int.parse(newValue.text) < min)
return TextEditingValue().copyWith(text: min.toStringAsFixed(2));
else
return int.parse(newValue.text) > max ? oldValue : newValue;
}
}
LatLng _moveByBottomPadding(
LatLng coordinates, double zoomLevel, double bottomOffset) {
final crs = const Epsg3857();
final oldCenterPt = crs.latLngToPoint(coordinates, zoomLevel);
final offset = CustomPoint(0, bottomOffset);
final newCenterPt = oldCenterPt + offset;
final newCenter = crs.pointToLatLng(newCenterPt, zoomLevel);
return newCenter!;
}Metadata
115
likes
0
pub points
95%
popularity
Publisher
Metadata
Plugin for 'flutter_map' providing advanced caching functionality, with ability to download map regions for offline use. Also includes useful prebuilt widgets.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
background_fetch, battery_info, bezier, collection, connectivity_plus, flutter, flutter_local_notifications, flutter_map, http, latlong2, meta, path, path_provider, permission_handler, queue, vector_math
