class PhotoViewerFiles extends StatefulWidget {
  final List<File> bilder;

  const PhotoViewerFiles({Key key, this.bilder}) : super(key: key);
  @override
  _PhotoViewerFilesState createState() => _PhotoViewerFilesState();
}

class _PhotoViewerFilesState extends State<PhotoViewerFiles> {
  Color backcolor = Colors.black; //Colors.transparent;
  PageController _pageController;
  List<File> mybilder;
  @override
  void initState() {
    super.initState();
    _pageController = PageController(
      initialPage: 1,
    );
    mybilder = [widget.bilder.last, ...widget.bilder, widget.bilder.first];

  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  void onpageChanged(idx) {
    debugPrint('onpageChanged$idx');
    if (idx == 0) {
      Future.delayed(Duration(milliseconds: 350), () {
        _pageController.jumpToPage(mybilder.length - 2);
      });
} else if (idx == (mybilder.length - 1)) {
      Future.delayed(Duration(milliseconds: 350), () {
        _pageController.jumpToPage(1);
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        color: backcolor,
        child: Stack(
          children: [
            Hero(
              tag: widget.bilder[0].path,
              child: PhotoViewGallery.builder(
                itemCount: mybilder.length,
                onPageChanged: onpageChanged,
                pageController: _pageController,