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@ -1,147 +1,173 @@
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import 'dart:async';
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import 'package:cuttle/utils/mlkit_utils.dart';
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import 'package:camerawesome/camerawesome_plugin.dart';
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import 'package:flutter/material.dart';
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import 'ffi.dart' if (dart.library.html) 'ffi_web.dart';
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import 'package:google_mlkit_barcode_scanning/google_mlkit_barcode_scanning.dart';
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import 'package:rxdart/rxdart.dart';
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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const MyApp({super.key});
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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title: 'camerAwesome App',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// Try running your application with "flutter run". You'll see the
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// application has a blue toolbar. Then, without quitting the app, try
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// changing the primarySwatch below to Colors.green and then invoke
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// "hot reload" (press "r" in the console where you ran "flutter run",
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// or simply save your changes to "hot reload" in a Flutter IDE).
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// Notice that the counter didn't reset back to zero; the application
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// is not restarted.
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primarySwatch: Colors.blue,
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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home: const MyHomePage(),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({Key? key, required this.title}) : super(key: key);
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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const MyHomePage({super.key});
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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// These futures belong to the state and are only initialized once,
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// in the initState method.
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late Future<Platform> platform;
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late Future<bool> isRelease;
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final _barcodeScanner = BarcodeScanner(formats: [BarcodeFormat.qrCode]);
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final _buffer = <String>[];
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final _barcodesController = BehaviorSubject<List<String>>();
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late final Stream<List<String>> _barcodesStream = _barcodesController.stream;
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final _scrollController = ScrollController();
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@override
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void initState() {
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super.initState();
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platform = api.platform();
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isRelease = api.rustReleaseMode();
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void dispose() {
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_barcodesController.close();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Invoke "debug painting" (press "p" in the console, choose the
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// "Toggle Debug Paint" action from the Flutter Inspector in Android
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// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
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// to see the wireframe for each widget.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text("You're running on"),
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// To render the results of a Future, a FutureBuilder is used which
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// turns a Future into an AsyncSnapshot, which can be used to
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// extract the error state, the loading state and the data if
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// available.
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//
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// Here, the generic type that the FutureBuilder manages is
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// explicitly named, because if omitted the snapshot will have the
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// type of AsyncSnapshot<Object?>.
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FutureBuilder<List<dynamic>>(
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// We await two unrelated futures here, so the type has to be
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// List<dynamic>.
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future: Future.wait([platform, isRelease]),
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builder: (context, snap) {
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final style = Theme.of(context).textTheme.headlineMedium;
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if (snap.error != null) {
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// An error has been encountered, so give an appropriate response and
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// pass the error details to an unobstructive tooltip.
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debugPrint(snap.error.toString());
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return Tooltip(
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message: snap.error.toString(),
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child: Text('Unknown OS', style: style),
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);
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}
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// Guard return here, the data is not ready yet.
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final data = snap.data;
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if (data == null) return const CircularProgressIndicator();
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// Finally, retrieve the data expected in the same order provided
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// to the FutureBuilder.future.
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final Platform platform = data[0];
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final release = data[1] ? 'Release' : 'Debug';
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final text = const {
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Platform.AndroidBish: 'Android, bish',
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Platform.Ios: 'iOS',
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Platform.MacApple: 'MacOS with Apple Silicon',
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Platform.MacIntel: 'MacOS',
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Platform.Windows: 'Windows',
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Platform.Unix: 'Unix',
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Platform.Wasm: 'the Web',
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}[platform] ??
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'Unknown OS';
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return Text('$text ($release)', style: style);
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},
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)
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],
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body: CameraAwesomeBuilder.previewOnly(
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onImageForAnalysis: (img) => _processImageBarcode(img),
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imageAnalysisConfig: AnalysisConfig(
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androidOptions: const AndroidAnalysisOptions.nv21(
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width: 1024,
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),
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maxFramesPerSecond: 5,
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autoStart: false,
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),
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builder: (cameraModeState, previewSize, previewRect) {
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return _BarcodeDisplayWidget(
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barcodesStream: _barcodesStream,
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scrollController: _scrollController,
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analysisController: cameraModeState.analysisController!,
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);
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},
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),
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);
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}
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Future _processImageBarcode(AnalysisImage img) async {
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final inputImage = toInputImage(img as Nv21Image);
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try {
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var recognizedBarCodes = await _barcodeScanner.processImage(inputImage);
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for (Barcode barcode in recognizedBarCodes) {
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debugPrint("Barcode: [${barcode.format}]: ${barcode.rawBytes}");
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_addBarcode("[${barcode.format.name}]: ${barcode.rawValue}");
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}
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} catch (error) {
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debugPrint("...sending image resulted error $error");
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}
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}
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void _addBarcode(String value) {
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try {
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if (_buffer.length > 300) {
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_buffer.removeRange(_buffer.length - 300, _buffer.length);
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}
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if (_buffer.isEmpty || value != _buffer[0]) {
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_buffer.insert(0, value);
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_barcodesController.add(_buffer);
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_scrollController.animateTo(
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0,
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duration: const Duration(milliseconds: 400),
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curve: Curves.fastLinearToSlowEaseIn,
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);
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}
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} catch (err) {
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debugPrint("...logging error $err");
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}
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}
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}
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class _BarcodeDisplayWidget extends StatefulWidget {
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final Stream<List<String>> barcodesStream;
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final ScrollController scrollController;
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final AnalysisController analysisController;
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const _BarcodeDisplayWidget({
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// ignore: unused_element
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super.key,
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required this.barcodesStream,
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required this.scrollController,
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required this.analysisController,
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});
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@override
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State<_BarcodeDisplayWidget> createState() => _BarcodeDisplayWidgetState();
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}
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class _BarcodeDisplayWidgetState extends State<_BarcodeDisplayWidget> {
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@override
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Widget build(BuildContext context) {
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return Align(
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alignment: Alignment.bottomCenter,
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child: Container(
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decoration: BoxDecoration(
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color: Colors.tealAccent.withOpacity(0.7),
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),
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child: Column(mainAxisSize: MainAxisSize.min, children: [
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Material(
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color: Colors.transparent,
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child: CheckboxListTile(
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value: widget.analysisController.enabled,
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onChanged: (newValue) async {
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if (widget.analysisController.enabled == true) {
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await widget.analysisController.stop();
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} else {
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await widget.analysisController.start();
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}
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setState(() {});
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},
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title: const Text(
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"Enable barcode scan",
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style: TextStyle(fontWeight: FontWeight.bold),
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),
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),
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),
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Container(
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height: 120,
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padding: const EdgeInsets.symmetric(horizontal: 16),
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child: StreamBuilder<List<String>>(
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stream: widget.barcodesStream,
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builder: (context, value) => !value.hasData
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? const SizedBox.expand()
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: ListView.separated(
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padding: const EdgeInsets.only(top: 8),
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controller: widget.scrollController,
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itemCount: value.data!.length,
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separatorBuilder: (context, index) =>
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const SizedBox(height: 4),
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itemBuilder: (context, index) => Text(value.data![index]),
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),
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),
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),
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]),
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),
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);
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}
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Joe Ardent