feat(ui_layout): add loading & error widget to component theme (close #69)

packages/wyatt_ui_components/lib/src/domain/entities/component.dart

@@ -0,0 +1,5 @@
+import 'package:flutter/material.dart';
+
+abstract class Component extends StatelessWidget {
+  const Component({super.key});
+}

packages/wyatt_ui_components/lib/src/domain/entities/components.dart

@@ -15,19 +15,16 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 import 'package:flutter/material.dart';
+import 'package:wyatt_ui_components/src/domain/entities/component.dart';
 
-abstract class AppBarComponent extends PreferredSize {
+abstract class AppBarComponent extends Component {
   final String? title;
-  const AppBarComponent({this.title, super.key})
+  const AppBarComponent({this.title, super.key});
-      : super(
-          preferredSize: const Size.fromHeight(60),
-          child: const SizedBox.shrink(),
-        );
 
   AppBarComponent configure({String? title});
 }
 
-abstract class BottomNavigationBarComponent extends StatelessWidget {
+abstract class BottomNavigationBarComponent extends Component {
   final int currentIndex;
   final void Function(BuildContext, int)? onTap;
   const BottomNavigationBarComponent({
@@ -41,3 +38,12 @@ abstract class BottomNavigationBarComponent extends StatelessWidget {
     int currentIndex = 0,
   });
 }
+
+abstract class ErrorWidget extends Component {
+  final String error;
+  const ErrorWidget({required this.error, super.key});
+}
+
+abstract class LoadingWidget extends Component {
+  const LoadingWidget({super.key});
+}

packages/wyatt_ui_components/lib/src/features/component_theme_data.dart

@@ -19,9 +19,13 @@ import 'package:wyatt_ui_components/src/domain/entities/components.dart';
 class ComponentThemeData {
   final AppBarComponent appBar;
   final BottomNavigationBarComponent bottomNavigationBar;
+  final ErrorWidget errorWidget;
+  final LoadingWidget loadingWidget;
 
   const ComponentThemeData.raw({
     required this.appBar,
     required this.bottomNavigationBar,
+    required this.errorWidget,
+    required this.loadingWidget,
   });
 }