Switch to a global cache

lib/core/cache/image_cache.dart

@@ -1,5 +1,4 @@
 import 'dart:io' as dart;
-import 'dart:typed_data';
 
 import 'package:photos/core/cache/lru_map.dart';
 import 'package:photos/models/file.dart';
@@ -27,15 +26,3 @@ class ThumbnailFileLruCache {
     _map.put(file.tag(), imageData);
   }
 }
-
-class BytesLruCache {
-  static LRUMap<String, Uint8List> _map = LRUMap(25);
-
-  static Uint8List get(File file) {
-    return _map.get(file.tag());
-  }
-
-  static void put(File file, Uint8List imageData) {
-    _map.put(file.tag(), imageData);
-  }
-}

lib/ui/zoomable_image.dart

@@ -94,24 +94,14 @@ class _ZoomableImageState extends State<ZoomableImage>
       _loadedSmallThumbnail = true;
     }
     if (!_loadedFinalImage) {
-      if (BytesLruCache.get(_photo) != null) {
+      DefaultCacheManager().getSingleFile(_photo.getDownloadUrl()).then((file) {
         _onFinalImageLoaded(
-            Image.memory(
-              BytesLruCache.get(_photo),
+            Image.file(
+              file,
               gaplessPlayback: true,
             ).image,
             context);
-      } else {
-        _photo.getBytes().then((data) {
-          _onFinalImageLoaded(
-              Image.memory(
-                data,
-                gaplessPlayback: true,
-              ).image,
-              context);
-          BytesLruCache.put(_photo, data);
-        });
-      }
+      });
     }
   }