问在图片上绘制CustomPainter图像加载PB

EN

class MyHomePage extends StatefulWidget {
   _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  var image=null;
  bool isImageloaded = false;
  void initState() {
    super.initState();
    init();
  }

  Future <Null> init() async {
    final ByteData data = await rootBundle.load('img/Capture5.PNG');
    this.image = await loadImage(Uint8List.view(data.buffer));
  }

  Future<ui.Image> loadImage(List<int> img) async {
    return decodeImageFromList(Uint8List.fromList(img));
  }

  Widget _buildImage() {
    if (image!=null) {
      print ("image fin de chargement");
      return CustomPaint(
        painter: ImageEditor(image: image),
      );
    } else {
      print ("is not Loading");
      return Center(child: Text('loading'));
    }
  }
  @override
  Widget build(BuildContext context) {

    return Scaffold(
        appBar: AppBar(
          title: Text('My aplly'),
        ),
        body: Container(
          child: _buildImage(),
        )
    );
  }
}