mobile_scanner.dart
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import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
enum Ratio { ratio_4_3, ratio_16_9 }
/// A widget showing a live camera preview.
class MobileScanner extends StatefulWidget {
/// The controller of the camera.
final MobileScannerController? controller;
/// Function that gets called when a Barcode is detected.
///
/// [barcode] The barcode object with all information about the scanned code.
/// [args] Information about the state of the MobileScanner widget
final Function(Barcode barcode, MobileScannerArguments? args)? onDetect;
/// TODO: Function that gets called when the Widget is initialized. Can be usefull
/// to check wether the device has a torch(flash) or not.
///
/// [args] Information about the state of the MobileScanner widget
// final Function(MobileScannerArguments args)? onInitialize;
/// Handles how the widget should fit the screen.
final BoxFit fit;
/// Set to false if you don't want duplicate scans.
final bool allowDuplicates;
/// Create a [MobileScanner] with a [controller], the [controller] must has been initialized.
const MobileScanner(
{Key? key,
this.onDetect,
this.controller,
this.fit = BoxFit.cover,
this.allowDuplicates = false, })
: super(key: key);
@override
State<MobileScanner> createState() => _MobileScannerState();
}
class _MobileScannerState extends State<MobileScanner>
with WidgetsBindingObserver {
late MobileScannerController controller;
@override
void initState() {
super.initState();
WidgetsBinding.instance?.addObserver(this);
controller = widget.controller ?? MobileScannerController();
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
switch (state) {
case AppLifecycleState.resumed:
if (!controller.isStarting) controller.start();
break;
case AppLifecycleState.inactive:
case AppLifecycleState.paused:
case AppLifecycleState.detached:
controller.stop();
break;
}
}
String? lastScanned;
@override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, BoxConstraints constraints) {
return ValueListenableBuilder(
valueListenable: controller.args,
builder: (context, value, child) {
value = value as MobileScannerArguments?;
if (value == null) {
return Container(color: Colors.black);
} else {
controller.barcodes.listen((barcode) {
if (!widget.allowDuplicates) {
if (lastScanned != barcode.rawValue) {
lastScanned = barcode.rawValue;
widget.onDetect!(barcode, value! as MobileScannerArguments);
}
} else {
widget.onDetect!(barcode, value! as MobileScannerArguments);
}
});
return ClipRect(
child: SizedBox(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
child: FittedBox(
fit: widget.fit,
child: SizedBox(
width: value.size.width,
height: value.size.height,
child: kIsWeb
? HtmlElementView(viewType: value.webId!)
: Texture(textureId: value.textureId!),
),
),
),
);
}
},);
},);
}
@override
void didUpdateWidget(covariant MobileScanner oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.controller == null) {
if (widget.controller != null) {
controller.dispose();
controller = widget.controller!;
}
} else {
if (widget.controller == null) {
controller = MobileScannerController();
} else if (oldWidget.controller != widget.controller) {
controller = widget.controller!;
}
}
}
@override
void dispose() {
controller.dispose();
WidgetsBinding.instance?.removeObserver(this);
super.dispose();
}
}