flutter_ocr_text_recognization 0.0.1

依赖 google_mlkit_text_recognition 实现的 OCR 文本识别相机，支持局部识别

example/lib/main.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_ocr_text_recognization/flutter_ocr_text_recognization.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'OCR Text Scan',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'OCR Text Scan'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String text = "";
  final StreamController<String> controller = StreamController<String>();

  void setText(value) {
    controller.add(value);
  }

  @override
  void dispose() {
    controller.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.symmetric(
                  vertical: 10,
                  horizontal: 10,
                ),
                child: TextOrcScan(
                  paintboxCustom: Paint()
                    ..style = PaintingStyle.stroke
                    ..strokeWidth = 4.0
                    ..color = const Color.fromARGB(153, 102, 160, 241),
                  boxRadius: 12,
                  painBoxLeftOff: 5,
                  painBoxBottomOff: 2.5,
                  painBoxRightOff: 5,
                  painBoxTopOff: 2.5,
                  widgetHeight: MediaQuery.of(context).size.height / 3,
                  getScannedText: (value) {
                    setText(value);
                  },
                ),
              ),
              StreamBuilder<String>(
                stream: controller.stream,
                builder:
                    (BuildContext context, AsyncSnapshot<String> snapshot) {
                  return ScanResult(
                      text: snapshot.data != null ? snapshot.data! : "");
                },
              )
            ],
          ),
        ));
  }
}

class ScanResult extends StatelessWidget {
  const ScanResult({
    Key? key,
    required this.text,
  }) : super(key: key);

  final String text;

  @override
  Widget build(BuildContext context) {
    return Text("识别结果 : $text");
  }
}