initial commit

lib/network/download.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/widgets.dart' show ChangeNotifier;
+
+abstract class DownloadTask with ChangeNotifier {
+  int get current;
+
+  int get total;
+
+  double get progress => current / total;
+
+  bool get isComplete => current == total;
+
+  int get speed;
+
+  void cancel();
+
+  void pause();
+
+  void resume();
+
+  String get title;
+
+  String? get cover;
+}