You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

276 lines
7.1 KiB

import 'dart:async';
import 'dart:io' show Platform;
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';
class ScanPage extends StatefulWidget {
ScanPage({Key key}) : super(key: key);
@override
_ScanPageState createState() => _ScanPageState();
}
class _ScanPageState extends State<ScanPage> {
ScanResult scanResult;
final _flashOnController = TextEditingController(text: "Flash on");
final _flashOffController = TextEditingController(text: "Flash off");
final _cancelController = TextEditingController(text: "Cancel");
var _aspectTolerance = 0.00;
var _numberOfCameras = 0;
var _selectedCamera = -1;
var _useAutoFocus = true;
var _autoEnableFlash = false;
static final _possibleFormats = BarcodeFormat.values.toList()
..removeWhere((e) => e == BarcodeFormat.unknown);
List<BarcodeFormat> selectedFormats = [..._possibleFormats];
@override
// ignore: type_annotate_public_apis
initState() {
super.initState();
Future.delayed(Duration.zero, () async {
_numberOfCameras = await BarcodeScanner.numberOfCameras;
setState(() {});
});
}
@override
Widget build(BuildContext context) {
var contentList = <Widget>[
if (scanResult != null)
Card(
child: Column(
children: <Widget>[
ListTile(
title: Text("Result Type"),
subtitle: Text(scanResult.type?.toString() ?? ""),
),
ListTile(
title: Text("Raw Content"),
subtitle: Text(scanResult.rawContent ?? ""),
),
ListTile(
title: Text("Format"),
subtitle: Text(scanResult.format?.toString() ?? ""),
),
ListTile(
title: Text("Format note"),
subtitle: Text(scanResult.formatNote ?? ""),
),
],
),
),
ListTile(
title: Text("Camera selection"),
dense: true,
enabled: false,
),
RadioListTile(
onChanged: (v) => setState(() => _selectedCamera = -1),
value: -1,
title: Text("Default camera"),
groupValue: _selectedCamera,
),
];
for (var i = 0; i < _numberOfCameras; i++) {
contentList.add(RadioListTile(
onChanged: (v) => setState(() => _selectedCamera = i),
value: i,
title: Text("Camera ${i + 1}"),
groupValue: _selectedCamera,
));
}
contentList.addAll([
ListTile(
title: Text("Button Texts"),
dense: true,
enabled: false,
),
ListTile(
title: TextField(
decoration: InputDecoration(
labelText: "Flash On",
),
controller: _flashOnController,
),
),
ListTile(
title: TextField(
decoration: InputDecoration(
labelText: "Flash Off",
),
controller: _flashOffController,
),
),
ListTile(
title: TextField(
decoration: InputDecoration(
labelText: "Cancel",
),
controller: _cancelController,
),
),
]);
if (Platform.isAndroid) {
contentList.addAll([
ListTile(
title: Text("Android specific options"),
dense: true,
enabled: false,
),
ListTile(
title:
Text("Aspect tolerance (${_aspectTolerance.toStringAsFixed(2)})"),
subtitle: Slider(
min: -1.0,
max: 1.0,
value: _aspectTolerance,
onChanged: (value) {
setState(() {
_aspectTolerance = value;
});
},
),
),
CheckboxListTile(
title: Text("Use autofocus"),
value: _useAutoFocus,
onChanged: (checked) {
setState(() {
_useAutoFocus = checked;
});
},
)
]);
}
contentList.addAll([
ListTile(
title: Text("Other options"),
dense: true,
enabled: false,
),
CheckboxListTile(
title: Text("Start with flash"),
value: _autoEnableFlash,
onChanged: (checked) {
setState(() {
_autoEnableFlash = checked;
});
},
)
]);
contentList.addAll([
ListTile(
title: Text("Barcode formats"),
dense: true,
enabled: false,
),
ListTile(
trailing: Checkbox(
tristate: true,
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
value: selectedFormats.length == _possibleFormats.length
? true
: selectedFormats.length == 0
? false
: null,
onChanged: (checked) {
setState(() {
selectedFormats = [
if (checked ?? false) ..._possibleFormats,
];
});
},
),
dense: true,
enabled: false,
title: Text("Detect barcode formats"),
subtitle: Text(
'If all are unselected, all possible platform formats will be used',
),
),
]);
contentList.addAll(_possibleFormats.map(
(format) => CheckboxListTile(
value: selectedFormats.contains(format),
onChanged: (i) {
setState(() => selectedFormats.contains(format)
? selectedFormats.remove(format)
: selectedFormats.add(format));
},
title: Text(format.toString()),
),
));
return Scaffold(
appBar: AppBar(
title: Text('Barcode Scanner Example'),
actions: <Widget>[
IconButton(
icon: Icon(Icons.camera),
tooltip: "Scan",
onPressed: scan,
)
],
),
body: ListView(
scrollDirection: Axis.vertical,
shrinkWrap: true,
children: contentList,
),
);
}
Future scan() async {
try {
var options = ScanOptions(
strings: {
"cancel": _cancelController.text,
"flash_on": _flashOnController.text,
"flash_off": _flashOffController.text,
},
restrictFormat: selectedFormats,
useCamera: _selectedCamera,
autoEnableFlash: _autoEnableFlash,
android: AndroidOptions(
aspectTolerance: _aspectTolerance,
useAutoFocus: _useAutoFocus,
),
);
var result = await BarcodeScanner.scan(options: options);
setState(() => scanResult = result);
} on PlatformException catch (e) {
var result = ScanResult(
type: ResultType.Error,
format: BarcodeFormat.unknown,
);
if (e.code == BarcodeScanner.cameraAccessDenied) {
setState(() {
result.rawContent = 'The user did not grant the camera permission!';
});
} else {
result.rawContent = 'Unknown error: $e';
}
setState(() {
scanResult = result;
});
}
}
}