opt: query data

fix: webdav backup

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/http/loading_state.dart

@@ -2,25 +2,52 @@ abstract class LoadingState<T> {
   const LoadingState();
 
   factory LoadingState.loading() = Loading;
-  // factory LoadingState.empty() = Empty;
   factory LoadingState.success(T response) = Success<T>;
   factory LoadingState.error(String errMsg) = Error;
 }
 
 class Loading extends LoadingState<Never> {
-  const Loading();
-}
+  Loading._internal();
 
-// class Empty extends LoadingState<Never> {
-//   const Empty();
-// }
+  static final Loading _instance = Loading._internal();
+
+  factory Loading() => _instance;
+}
 
 class Success<T> extends LoadingState<T> {
   final T response;
   const Success(this.response);
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) {
+      return true;
+    }
+    if (other is Success) {
+      return response == other.response;
+    }
+    return false;
+  }
+
+  @override
+  int get hashCode => response.hashCode;
 }
 
 class Error extends LoadingState<Never> {
   final String errMsg;
   const Error(this.errMsg);
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) {
+      return true;
+    }
+    if (other is Error) {
+      return errMsg == other.errMsg;
+    }
+    return false;
+  }
+
+  @override
+  int get hashCode => errMsg.hashCode;
 }