fix: Add debounce transformer to SignUpBloc form input events to reduce lag.

Signed-off-by: BURG3R5 <77491630+BURG3R5@users.noreply.github.com>

Author: BURG3R5

lib/presentation/signup/bloc/sign_up_bloc.dart

@@ -14,6 +14,7 @@ import '../../../domain/models/handle.dart';
 import '../../../domain/models/sign_up.dart';
 import '../../../domain/models/status.dart';
 import '../../../domain/repositories/user_repository.dart';
+import '../../../utils/bloc_transformer.dart';
 import '../../../utils/failures.dart';
 import '../widgets/signup_widgets.dart';
 
@@ -30,12 +31,30 @@ class SignUpBloc extends Bloc<SignUpEvent, SignUpState> {
     on<Back>(_handleBack);
     on<Next>(_handleNext);
 
-    on<EmailInput>(_updateEmail);
-    on<InstituteInput>(_updateInstitute);
-    on<NameInput>(_updateName);
-    on<PasswordInput>(_updatePassword);
-    on<PlatformHandleInput>(_updateHandles);
-    on<UsernameInput>(_updateUsername);
+    on<EmailInput>(
+      _updateEmail,
+      transformer: getDebounce<EmailInput>(),
+    );
+    on<InstituteInput>(
+      _updateInstitute,
+      transformer: getDebounce<InstituteInput>(),
+    );
+    on<NameInput>(
+      _updateName,
+      transformer: getDebounce<NameInput>(),
+    );
+    on<PasswordInput>(
+      _updatePassword,
+      transformer: getDebounce<PasswordInput>(),
+    );
+    on<PlatformHandleInput>(
+      _updateHandles,
+      transformer: getDebounce<PlatformHandleInput>(),
+    );
+    on<UsernameInput>(
+      _updateUsername,
+      transformer: getDebounce<UsernameInput>(),
+    );
 
     on<SelectImage>(_selectImage);
     on<ToggleObscure>(_toggleObscurePassword);

lib/utils/bloc_transformer.dart

@@ -0,0 +1,11 @@
+import 'package:rxdart/rxdart.dart';
+
+/// Provides a custom debounce BLoC transformer that waits till
+/// 200ms of inactivity before processing/calling event handlers.
+Stream<T> Function(Stream<T>, Stream<T> Function(T)) getDebounce<T>() {
+  return (Stream<T> events, Stream<T> Function(T) mapper) {
+    return events
+        .debounceTime(const Duration(milliseconds: 200))
+        .switchMap(mapper);
+  };
+}

pubspec.lock

@@ -843,7 +843,7 @@ packages:
     source: hosted
     version: "1.2.0"
   rxdart:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: rxdart
       url: "https://pub.dartlang.org"

pubspec.yaml

@@ -32,6 +32,7 @@ dependencies:
   image_picker: ^0.8.4+10
   intl: ^0.17.0
   json_annotation: ^4.4.0
+  rxdart: ^0.27.3
   sentry_flutter: ^6.2.2
 
 dev_dependencies: