Web support

flutter_barcode_reader_web/lib/barcode_web.dart

@@ -0,0 +1,235 @@
+@JS()
+library jsqrscanner;
+
+import 'dart:async';
+import 'dart:html';
+
+import 'package:flutter/services.dart';
+import 'package:js/js.dart';
+import 'package:js/js_util.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+class BarcodeScanPlugin {
+  Completer<String> _completer;
+
+  static void registerWith(Registrar registrar) {
+    final MethodChannel channel = MethodChannel(
+      'de.mintware.barcode_scan',
+      const StandardMethodCodec(),
+      registrar.messenger
+    );
+    final BarcodeScanPlugin instance = new BarcodeScanPlugin();
+    channel.setMethodCallHandler(instance.handleMethodCall);
+  }
+
+  Future<String> handleMethodCall(MethodCall call) async {
+    _createCSS();
+    var script = document.createElement('script');
+    script.setAttribute('type', 'text/javascript');
+    document.querySelector('head').append(script);
+    script.setAttribute('src', 'https://cdn.jsdelivr.net/gh/jbialobr/JsQRScanner@master/war/js/jsqrscanner.nocache.js');
+    _createHTML();
+    document.querySelector('#toolbar p').addEventListener('click', (event) => _close());
+    setProperty(window, 'JsQRScannerReady', allowInterop(this.scannerReady));
+    _completer = new Completer<String>();
+    return _completer.future;
+  }
+
+  void _createCSS() {
+    var style = document.createElement('style');
+    style.appendText('''
+    * {
+      margin: 0;
+      padding: 0;
+    }
+
+    body {
+      overflow: hidden;
+    }
+
+    #container {
+      position: fixed;
+      width: 100%;
+      height: 100%;
+      background-color: #2F2F2F;
+    }
+
+    video {
+      position: relative;
+      top: 0;
+      left: 0;
+      height: 100vh;
+      width: 100vw;
+      object-fit: cover;
+    }
+
+    #cover {
+      position: absolute;
+      top: 50%;
+      left: 50%;
+      width: 70vmin;
+      height: 70vmin;
+      transform: translateX(-50%) translateY(-50%);
+      text-align: center;
+    }
+
+    #cover:after {
+      content:'';
+      position: absolute;
+      top: 0;
+      left: 0;
+      width: 100%;
+      height: 100%;
+      box-shadow: 0 0 0 999px rgba(0, 0, 0, 0.4);
+    }
+
+    #cover img {
+      width: 100%;
+      height: 100%;
+    }
+
+    #cover > div {
+      background-color: #BFE47B; 
+    }
+
+    #topleft, #lefttop {
+      position: absolute;
+      top: 0;
+      left: 0;
+    }
+
+    #topleft {
+      width: 8vmin;
+      height: 2vmin;
+    }
+
+    #lefttop {
+      width: 2vmin;
+      height: 8vmin;
+    }
+
+    #topright, #righttop {
+      position: absolute;
+      top: 0;
+      right: 0;
+    }
+
+    #topright {
+      width: 8vmin;
+      height: 2vmin;
+    }
+
+    #righttop {
+      width: 2vmin;
+      height: 8vmin;
+    }
+
+    #bottomleft, #leftbottom {
+      position: absolute;
+      bottom: 0;
+      left: 0;
+    }
+
+    #bottomleft {
+      width: 8vmin;
+      height: 2vmin;
+    }
+
+    #leftbottom {
+      width: 2vmin;
+      height: 8vmin;
+    }
+
+    #bottomright, #rightbottom {
+      position: absolute;
+      bottom: 0;
+      right: 0;
+    }
+
+    #bottomright {
+      width: 8vmin;
+      height: 2vmin;
+    }
+
+    #rightbottom {
+      width: 2vmin;
+      height: 8vmin;
+    }
+
+    #toolbar {
+      background-color: #2F2F2F;
+    }
+
+    #toolbar p {
+      float: left;
+      font-size: 24px;
+      color: white;
+      margin-left: 16px;
+      padding: 16px;
+    }
+
+    #clear {
+      clear: both;
+    }
+    ''');
+    document.querySelector('head').append(style);
+  }
+
+  void _createHTML() {
+    var containerDiv = document.createElement('div');
+    containerDiv.id = 'container';
+    containerDiv.innerHtml = '''
+    <div id="toolbar">
+      <p>X</p>
+      <div id="clear"></div>
+    </div>
+    <div id="scanner"></div>
+    <div id="cover">
+      <div id="topleft"></div>
+      <div id="lefttop"></div>
+      <div id="topright"></div>
+      <div id="righttop"></div>
+      <div id="bottomleft"></div>
+      <div id="leftbottom"></div>
+      <div id="bottomright"></div>
+      <div id="rightbottom"></div>
+    </div>
+    ''';
+    document.body.append(containerDiv);
+  }
+
+  void onQRCodeScanned(String scannedText) {
+    _completer.complete(scannedText);
+    _close();
+  }
+
+  void _close() {
+    document.getElementById('container').remove();
+  }
+
+  void scannerReady() {
+    var scanner = JsQRScanner(onQRCodeScanned, provideVideo);
+    scanner.setSnapImageMaxSize(300);
+    var scannerParentElement = document.getElementById('scanner');
+    scanner.appendTo(scannerParentElement);
+  }
+
+  Promise<MediaStream> provideVideo() {
+    return new Promise<MediaStream>(allowInterop((resolve, reject) {
+      window.navigator.getUserMedia(video: true).then(resolve, onError: reject);
+    }));
+  } 
+}
+
+@JS()
+class JsQRScanner {
+  external factory JsQRScanner(Function onQRCodeScanned, Function provideVideo);
+  external setSnapImageMaxSize(int maxSize);
+  external appendTo(Element element);
+}
+
+@JS()
+class Promise<T> {
+  external Promise(void executor(void resolve(T result), Function reject));
+  external Promise then(void onFulfilled(T result), [Function onRejected]);
+}

flutter_barcode_reader_web/pubspec.yaml

@@ -0,0 +1,22 @@
+name: barcode_scan_web
+description: A flutter plugin for scanning 2D barcodes and QRCodes via camera.
+version: 2.0.1
+homepage: https://github.com/mintware-de/flutter_barcode_reader
+
+dependencies:
+  flutter:
+    sdk: flutter
+  flutter_web_plugins:
+    sdk: flutter
+  js: ^0.6.0
+
+environment: 
+  sdk: ">=2.0.0-dev.58.0 <3.0.0" 
+  flutter: ^1.10.0
+
+flutter:
+  plugin:
+    platforms:
+      web:
+        pluginClass: BarcodeScanPlugin
+        fileName: barcode_web.dart

pubspec.yaml

@@ -7,8 +7,8 @@ dependencies:
   flutter:
     sdk: flutter
 
-environment:
-  sdk: ">=2.0.0-dev.58.0 <3.0.0"
+environment: 
+  sdk: ">=2.0.0-dev.58.0 <3.0.0" 
 
 flutter:
   plugin: