@override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      body: Stack(
        children: <Widget>[
          FutureBuilder<void>(
            future: _initializeControllerFuture,
            builder: (context, snapshot) {

              if (snapshot.connectionState == ConnectionState.done) {
                return Stack(
                  alignment: FractionalOffset.center,
                  children: <Widget>[
                    new Positioned.fill(
                      child: _getCameraPreview(context),
                    ),
                    new Positioned.fill(
                      child: new Opacity(
                          opacity: 0.7,
                          child: Image.asset(
                            _layoutPath,
                            scale: 5,
                            fit: BoxFit.none,
                            alignment: Alignment(0.2, 0.1),
                          )),
                    ),
                  ],
                );
              } else {
                return Center(child: CircularProgressIndicator());
              }
            },
          ),
          Align(
            alignment: Alignment.bottomCenter,
            child: BottomAppBar(
              color: Color.fromARGB(0, 0, 0, 0),
              child: _getBottomAppBarRow(context),
            ),
          ),
        ],
      ),
    );
  }

  _getCameraPreview(BuildContext context) {
    final size = MediaQuery.of(context).size;
    final deviceRatio = size.width / size.height;
    return Transform.scale(
      scale: _controller.value.aspectRatio / deviceRatio,
      child: Center(
        child: AspectRatio(
          aspectRatio: _controller.value.aspectRatio,
          child: CameraPreview(_controller),
        ),
      ),
    );
  }

final shutterButton = Material(
      elevation: 5.0,
      borderRadius: BorderRadius.circular(30.0),
      color: AppColors.white,
      child: FloatingActionButton(
        child: Icon(
          Icons.camera,
          color: AppColors.white,
          size: 24,
        ),
        onPressed: () async {
          try {
            await _initializeControllerFuture;

            final path = join(
              (await getTemporaryDirectory()).path,
              '${DateTime.now()}.png',
            );
            await _controller.takePicture(path);

            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => DisplayPictureScreen(imagePath: path),
              ),
            );
            _controller.dispose();
          } catch (e) {
            print(e);
          }
        },
      ),
    );