First designs for ui

hartmann-foto-documentation-frontend/lib/controller/customer_controller.dart

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+import 'package:fotodocumentation/controller/base_controller.dart';
+import 'package:fotodocumentation/dto/customer_dto.dart';
+
+abstract interface class CustomerController {
+  Future<List<CustomerListDto>> getAll(String query, String startsWith);
+
+  Future<CustomerDto?> get({required int id});
+}
+
+class CustomerControllerImpl extends BaseController implements CustomerController {
+  final String path = "customer";
+
+  @override
+  Future<List<CustomerListDto>> getAll(String query, String startsWith) async {
+    String uriStr = '${uriUtils.getBaseUrl()}$path?query=$query&startsWith=$startsWith';
+    return runGetListWithAuth(uriStr, (p0) {
+      List<CustomerListDto> retVal = [];
+      for (var elem in p0) {
+        var entity = CustomerListDto.fromJson(elem);
+        retVal.add(entity);
+      }
+      return retVal;
+    });
+  }
+
+  @override
+  Future<CustomerDto?> get({required int id}) {
+    String uriStr = '${uriUtils.getBaseUrl()}$path/$id';
+    return runGetWithAuth(uriStr, (json) => CustomerDto.fromJson(json));
+  }
+}

hartmann-foto-documentation-frontend/lib/controller/picture_controller.dart

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+import 'package:fotodocumentation/controller/base_controller.dart';
+import 'package:fotodocumentation/dto/customer_dto.dart';
+
+abstract interface class PictureController {
+  Future<PictureDto?> get({required int id});
+  Future<bool> delete(PictureDto dto);
+}
+
+class PictureControllerImpl extends BaseController implements PictureController {
+  final String path = "picture";
+
+  @override
+  Future<PictureDto?> get({required int id}) {
+    String uriStr = '${uriUtils.getBaseUrl()}$path/$id';
+    return runGetWithAuth(uriStr, (json) => PictureDto.fromJson(json));
+  }
+
+  @override
+  Future<bool> delete(PictureDto dto) {
+    // TODO: implement delete
+    throw UnimplementedError();
+  }
+}