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import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
import 'package:path_provider/path_provider.dart';
List<CameraDescription> cameras;
IconData getCameraLensIcon(CameraLensDirection direction) {
switch (direction) {
case CameraLensDirection.back:
return Icons.camera_rear;
case CameraLensDirection.front:
return Icons.camera_front;
case CameraLensDirection.external:
return Icons.camera;
}
throw ArgumentError('Unknown lens direction');
}
class CameraWidget extends StatefulWidget {
@override
CameraState createState() => CameraState();
}
class CameraState extends State<CameraWidget> {
final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
List<CameraDescription> cameras;
CameraController controller;
bool isReady = false;
bool showCamera = true;
String imagePath;
// Inputs
TextEditingController nameController = TextEditingController();
TextEditingController countryController = TextEditingController();
TextEditingController abvController = TextEditingController();
@override
void initState() {
super.initState();
setupCameras();
}
Future<void> setupCameras() async {
try {
cameras = await availableCameras();
controller = new CameraController(cameras[0], ResolutionPreset.medium);
await controller.initialize();
} on CameraException catch (_) {
setState(() {
isReady = false;
});
}
setState(() {
isReady = true;
});
}
Widget build(BuildContext context) {
return Scaffold(
key: scaffoldKey,
body: Center(
child: SingleChildScrollView(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
Center(
child: showCamera
? Container(
height: 290,
child: Padding(
padding: const EdgeInsets.only(top: 5),
child: Center(child: cameraPreviewWidget()),
),
)
: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
imagePreviewWidget(),
editCaptureControlRowWidget(),
]),
),
showCamera ? captureControlRowWidget() : Container(),
cameraOptionsWidget(),
beerInfoInputsWidget()
],
),
)));
}
void onNewCameraSelected(CameraDescription cameraDescription) async {
if (controller != null) {
await controller.dispose();
}
controller = CameraController(cameraDescription, ResolutionPreset.high);
controller.addListener(() {
if (mounted) setState(() {});
if (controller.value.hasError) {
showInSnackBar('Camera error ${controller.value.errorDescription}');
}
});
try {
await controller.initialize();
} on CameraException catch (e) {
showInSnackBar('Camera error ${e}');
}
if (mounted) {
setState(() {});
}
}
Widget cameraOptionsWidget() {
return Padding(
padding: const EdgeInsets.all(5.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
showCamera ? cameraTogglesRowWidget() : Container(),
],
),
);
}
Widget cameraTogglesRowWidget() {
final List<Widget> toggles = <Widget>[];
if (cameras != null) {
if (cameras.isEmpty) {
return const Text('No camera found');
} else {
for (CameraDescription cameraDescription in cameras) {
toggles.add(
SizedBox(
width: 90.0,
child: RadioListTile<CameraDescription>(
title: Icon(getCameraLensIcon(cameraDescription.lensDirection)),
groupValue: controller?.description,
value: cameraDescription,
onChanged: controller != null ? onNewCameraSelected : null,
),
),
);
}
}
}
return Row(children: toggles);
}
Widget captureControlRowWidget() {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
IconButton(
icon: const Icon(Icons.camera_alt),
color: Colors.blue,
onPressed: controller != null && controller.value.isInitialized
? onTakePictureButtonPressed
: null,
),
],
);
}
Widget beerInfoInputsWidget() {
return Column(
children: [
Padding(
padding: const EdgeInsets.only(left: 3, bottom: 4.0),
child: TextField(
controller: nameController,
onChanged: (v) => nameController.text = v,
decoration: InputDecoration(
labelText: 'Name the beer',
)),
),
Padding(
padding: const EdgeInsets.only(left: 3, bottom: 4.0),
child: TextField(
controller: countryController,
onChanged: (v) => countryController.text = v,
decoration: InputDecoration(
labelText: "Country name",
)),
),
Padding(
padding: const EdgeInsets.only(left: 3),
child: TextField(
controller: abvController,
onChanged: (v) => abvController.text = v,
decoration: InputDecoration(
labelText: 'ABV',
)),
),
Padding(
padding: const EdgeInsets.all(16.0),
child: Builder(
builder: (context) {
return RaisedButton(
onPressed: () => {},
color: Colors.lightBlue,
child: Text('Add beer'),
);
},
),
),
],
);
}
Widget editCaptureControlRowWidget() {
return Padding(
padding: const EdgeInsets.only(top: 5),
child: Align(
alignment: Alignment.topCenter,
child: IconButton(
icon: const Icon(Icons.camera_alt),
color: Colors.blue,
onPressed: () => setState(() {
showCamera = true;
}),
),
),
);
}
void onTakePictureButtonPressed() {
takePicture().then((String filePath) {
if (mounted) {
setState(() {
showCamera = false;
imagePath = filePath;
});
}
});
}
void showInSnackBar(String message) {
scaffoldKey.currentState.showSnackBar(SnackBar(content: Text(message)));
}
Future<String> takePicture() async {
if (!controller.value.isInitialized) {
return null;
}
final Directory extDir = await getApplicationDocumentsDirectory();
final String dirPath = '${extDir.path}/Pictures/flutter_test';
await Directory(dirPath).create(recursive: true);
final String filePath = '$dirPath/${timestamp()}.jpg';
if (controller.value.isTakingPicture) {
return null;
}
try {
await controller.takePicture(filePath);
} on CameraException catch (e) {
return null;
}
return filePath;
}
Widget cameraPreviewWidget() {
if (!isReady || !controller.value.isInitialized) {
return Container();
}
return AspectRatio(
aspectRatio: controller.value.aspectRatio,
child: CameraPreview(controller));
}
String timestamp() => DateTime.now().millisecondsSinceEpoch.toString();
Widget imagePreviewWidget() {
return Container(
child: Padding(
padding: const EdgeInsets.only(top: 10),
child: Align(
alignment: Alignment.topCenter,
child: imagePath == null
? null
: SizedBox(
child: Image.file(File(imagePath)),
height: 290.0,
),
),
));
}
}
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