전역 구조 리팩터링 및 테스트 확장

lib/features/masters/product/presentation/controllers/product_controller.dart

@@ -11,6 +11,8 @@ import '../../domain/repositories/product_repository.dart';
 enum ProductStatusFilter { all, activeOnly, inactiveOnly }
 
 class ProductController extends ChangeNotifier {
+  static const int defaultPageSize = 20;
+
   ProductController({
     required ProductRepository productRepository,
     required VendorRepository vendorRepository,
@@ -31,6 +33,7 @@ class ProductController extends ChangeNotifier {
   int? _vendorFilter;
   int? _uomFilter;
   ProductStatusFilter _statusFilter = ProductStatusFilter.all;
+  int _pageSize = defaultPageSize;
   String? _errorMessage;
 
   List<Vendor> _vendorOptions = const [];
@@ -44,6 +47,7 @@ class ProductController extends ChangeNotifier {
   int? get vendorFilter => _vendorFilter;
   int? get uomFilter => _uomFilter;
   ProductStatusFilter get statusFilter => _statusFilter;
+  int get pageSize => _pageSize;
   String? get errorMessage => _errorMessage;
   List<Vendor> get vendorOptions => _vendorOptions;
   List<Uom> get uomOptions => _uomOptions;
@@ -60,13 +64,16 @@ class ProductController extends ChangeNotifier {
       };
       final response = await _productRepository.list(
         page: page,
-        pageSize: _result?.pageSize ?? 20,
+        pageSize: _pageSize,
         query: _query.isEmpty ? null : _query,
         vendorId: _vendorFilter,
         uomId: _uomFilter,
         isActive: isActive,
       );
       _result = response;
+      if (response.pageSize > 0 && response.pageSize != _pageSize) {
+        _pageSize = response.pageSize;
+      }
     } catch (e) {
       _errorMessage = e.toString();
     } finally {
@@ -92,25 +99,45 @@ class ProductController extends ChangeNotifier {
   }
 
   void updateQuery(String value) {
+    if (_query == value) {
+      return;
+    }
     _query = value;
     notifyListeners();
   }
 
   void updateVendorFilter(int? vendorId) {
+    if (_vendorFilter == vendorId) {
+      return;
+    }
     _vendorFilter = vendorId;
     notifyListeners();
   }
 
   void updateUomFilter(int? uomId) {
+    if (_uomFilter == uomId) {
+      return;
+    }
     _uomFilter = uomId;
     notifyListeners();
   }
 
   void updateStatusFilter(ProductStatusFilter filter) {
+    if (_statusFilter == filter) {
+      return;
+    }
     _statusFilter = filter;
     notifyListeners();
   }
 
+  void updatePageSize(int size) {
+    if (size <= 0 || _pageSize == size) {
+      return;
+    }
+    _pageSize = size;
+    notifyListeners();
+  }
+
   Future<Product?> create(ProductInput input) async {
     _setSubmitting(true);
     try {