clean up

lib/pages/widgets/display_image_source.dart

@@ -0,0 +1,30 @@
+import 'dart:io';
+
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/widgets.dart';
+
+class DisplayImageSource {
+  String url;
+  File file;
+  DisplayImageSource({this.url, this.file});
+
+  ImageProvider get imageProvider =>
+      file == null ? CachedNetworkImageProvider(url) : FileImage(file);
+
+  @override
+  bool operator ==(other) {
+    if (identical(this, other)) {
+      return true;
+    }
+    return (other.file == this.file &&
+            (other.file != null || this.file != null)) ||
+        (other.url == this.url && (other.url != null || this.url != null));
+  }
+
+  @override
+  int get hashCode {
+    int result = 17;
+    result = 37 * result + file.hashCode;
+    return result;
+  }
+}