fcs/lib/pages/widgets/show_multiple_img.dart

import 'package:fcs/helpers/theme.dart';
import 'package:fcs/pages/widgets/display_image_source.dart';
import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';
import 'package:photo_view/photo_view_gallery.dart';

class ShowMultiImage extends StatefulWidget {
  final List<DisplayImageSource> displayImageSources;
  final int initialPage;
  const ShowMultiImage(
      {Key? key, required this.displayImageSources, this.initialPage = 0})
      : super(key: key);
  @override
  _ShowMultiImageState createState() => _ShowMultiImageState();
}

class _ShowMultiImageState extends State<ShowMultiImage> {
  late PageController pageController;
  @override
  void initState() {
    pageController = PageController(initialPage: widget.initialPage);
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
          backgroundColor: primaryColor,
          body: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              IconButton(
                onPressed: () => Navigator.pop(context),
                icon: Icon(
                  Icons.close,
                  color: Colors.white,
                ),
              ),
              Expanded(
                  child: PhotoViewGallery.builder(
                scrollPhysics: const BouncingScrollPhysics(),
                builder: (BuildContext context, int index) {
                  return PhotoViewGalleryPageOptions(
                    imageProvider:
                        widget.displayImageSources[index].imageProvider,
                    initialScale: PhotoViewComputedScale.contained * 0.95,
                    heroAttributes: PhotoViewHeroAttributes(
                        tag: widget.displayImageSources[index].hashCode),
                  );
                },
                itemCount: widget.displayImageSources.length,
                loadingBuilder: (context, event) => Center(
                  child: Container(
                    width: 20.0,
                    height: 20.0,
                    child: CircularProgressIndicator(
                      value: event == null
                          ? 0
                          : event.cumulativeBytesLoaded /
                              event.expectedTotalBytes!,
                    ),
                  ),
                ),
                backgroundDecoration: const BoxDecoration(
                  color: primaryColor,
                ),
                pageController: pageController,
              )),
            ],
          )),
    );
  }
}