flutter-fqreader/lib/fqreader.dart

library fqreader;


import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';

part "scan_view.dart";

typedef ScanEvent = Future<bool> Function(ScanResult value);

class Fqreader {
  static const MethodChannel _channel =
  const MethodChannel('fqreader');

  static Future<ScanResult> decodeImg(File file,List<ScanType> scanType) async{
    var scanStr = new List<String>();
    scanType.forEach((item){
      scanStr.add(item.toString());
    });

    List<int> data = file.readAsBytesSync();
    Uint8List uData = new Uint8List.fromList(data);

    var result = await  _channel.invokeMethod('decodeImg',{
      "image": uData,
      "scanType": scanStr
    });
    if(result == null)
      return null;

    return ScanResult(
      scanType: _parseScanType(result['scanType']),
      data: result['data'],
    );
  }

  static Future<InitResult> _initView({
      @required Size viewSize,
      @required List<ScanType> scanType,
      double devicePixelRatio
  }) async {
    var scanStr = new List<String>();
    scanType.forEach((item){
      scanStr.add(item.toString());
    });

    final Map<dynamic,dynamic> result = await _channel.invokeMethod('initView',{
      "viewSize":{
        "width":(viewSize.width* devicePixelRatio).toInt(),
        "height":(viewSize.height* devicePixelRatio).toInt(),
      },
      "scanType": scanStr
    });
    
    return InitResult(
      cameraSize: Size(result['cameraHeight'] / devicePixelRatio, result['cameraWidth']  / devicePixelRatio),
      textureID: result['textureID']
    );
  }
  static Future _setScanRect(
      Rect scanRect,
      double devicePixelRatio) async{
    await _channel.invokeMethod('setScanRect',{
    "scanRect":{
    "left":(scanRect.left* devicePixelRatio).toInt(),
    "top":(scanRect.top* devicePixelRatio).toInt(),
    "right":(scanRect.right* devicePixelRatio).toInt(),
    "bottom":(scanRect.bottom* devicePixelRatio).toInt(),
    }});
  }
  static Future _startScan() async{
    await _channel.invokeMethod('startScan');
  }

  static Future _stopScan() async{
    await _channel.invokeMethod('stopScan');
  }
  static Future _turnOn() async{
    await _channel.invokeMethod("turnOn");
  }
  static Future _turnOff() async{
    await _channel.invokeMethod("turnOff");
  }
  static Future _release() async{
    await _channel.invokeMethod("release");
  }
}

class InitResult{
  final Size cameraSize;
  final int textureID;
  const InitResult({this.cameraSize,this.textureID});
}

class ScanResult{
  final String data;
  final ScanType scanType;
  const ScanResult({this.data,this.scanType});
}

enum ScanType{
  /**
   * 所有条形码
   */
  ALL,
  /**
   *  普通二维码
   */
  QR_CODE,
  /**
   *  二维码 主要用于航空。比如坐飞机行李箱上贴的便签
   */
  AZTEC,
  /**
   * 条形码
   */
  CODABAR,
  /**
   * CODE 39 条形码
   */
  CODE_39,
  /**
   * CODE 92 条形码
   */
  CODE_93,
  /**
   *  CODE 128 条形码
   */
  CODE_128,
  /**
   * 商品用条形码 EAN8
   */
  EAN8,
  /**
   * 商品用条形码 EAN13
   */
  EAN13,
  /**
   * 全球贸易货号。主要用于运输方面的条形码
   */
  ITF,
  /**
   * 一种二维码
   */
  DATA_MATRIX,
  /**
   * PDF417条码是一种高密度、高信息含量的便携式数据文件
   */
  PDF_417,
}

ScanType _parseScanType(String str){
  switch(str){
    case 'ScanType.ALL':
      return ScanType.ALL;
    case 'ScanType.QR_CODE':
      return ScanType.QR_CODE;
    case 'ScanType.AZTEC':
      return ScanType.AZTEC;
    case 'ScanType.CODABAR':
      return ScanType.CODABAR;
    case 'ScanType.CODE_39':
      return ScanType.CODE_39;
    case 'ScanType.CODE_93':
      return ScanType.CODE_93;
    case 'ScanType.CODE_128':
      return ScanType.CODE_128;
    case 'ScanType.EAN8':
      return ScanType.EAN8;
    case 'ScanType.EAN13':
      return ScanType.EAN13;
    case 'ScanType.ITF':
      return ScanType.ITF;
    case 'ScanType.DATA_MATRIX':
      return ScanType.DATA_MATRIX;
    case 'ScanType.PDF_417':
      return ScanType.PDF_417;
  }
  return null;
}