In flutter, how to take screenshot of whole image after scrolling image horizontally?

Question

current I am struggling to take whole screenshot from Stack Widget(used screenshot package from pub.dev). But after scrolling image horizontally and taking screenshot, I don't get missing part of image. Below is my code I have used. Thanks for advance.

Screenshot(
          controller: screenshotController,
          child: Stack(
            children: [
              // buildCurrentPath(context),
              BlocBuilder<PatientBloc, PatientState>(
                builder: (context, state) {
                  return Container(
                    child: LayoutBuilder(
                      builder: (context, constraints) => RepaintBoundary(
                        child: SingleChildScrollView(
                          // physics: NeverScrollableScrollPhysics(),
                          scrollDirection: Axis.horizontal,
                          child: SizedBox(
                            height: constraints.biggest.height,
                            // height: constraints.biggest.height,
                            // width: 200,
                            child: Image(
                              fit: BoxFit.cover,
                              image: FileImage(
                                File(
                                    "/storage/emulated/0/Android/data/com.kk/files/test.png"),
                              ),
                            ),
                          ),
                        ),
                      ),
                    ),
                  );
                },
              ),
            ],
          ),
        ),