fcs/lib/pages/widgets/show_img.dart

import 'dart:io';

import 'package:fcs/helpers/theme.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';

class ShowImage extends StatefulWidget {
  final String url;
  final File imageFile;
  final String fileName;
  final String localImage;
  const ShowImage(
      {Key key, this.imageFile, this.fileName, this.url, this.localImage})
      : super(key: key);
  @override
  _ShowImageState createState() => _ShowImageState();
}

class _ShowImageState extends State<ShowImage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: new IconButton(
          icon: new Icon(Icons.close),
          onPressed: () => Navigator.of(context).pop(),
        ),
        backgroundColor: primaryColor,
        shadowColor: Colors.transparent,
        iconTheme: new IconThemeData(color: Colors.white),
      ),
      body: Center(
          child: PhotoView(
              backgroundDecoration: const BoxDecoration(
                color: primaryColor,
              ),
              imageProvider: widget.url != null
                  ? NetworkImage(widget.url)
                  : widget.imageFile != null
                      ? FileImage(widget.imageFile)
                      : AssetImage(widget.localImage),
              minScale: PhotoViewComputedScale.contained * 1)),
    );
  }
}