'Preview widget screenshot flutter

Hello guys I am new to flutter.

How can I take a screenshot from a widget, preview it to a new page and decide if I would like to save it in the gallery or not?

Here is my code

takeScreenShot(BuildContext context) async {
    final path= join((await getTemporaryDirectory()).path,"${DateTime.now()}.png");
    RenderRepaintBoundary boundary =
    _globalKey.currentContext.findRenderObject();
    var image = await boundary.toImage();
    var byteData = await image.toByteData(format: ImageByteFormat.png);
    var pngBytes = byteData.buffer.asUint8List();        
    Navigator.push(context, MaterialPageRoute(builder: (builder)=>ScreenshotViewPage(path: path,)));
  }

The global key is added to the root widget.

fluttersavescreenshotpreview


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