refactor: replace shelltranslationservice with validationMessage input

example/lib/example_pages/age_page.dart

@@ -35,6 +35,7 @@ class _AgePageState extends State<AgePage> {
           minValue: 12,
           maxValue: 120,
           controller: widget.inputController,
+          validationMessage: 'Please fill in your age.',
         ),
       ],
     );

example/lib/example_pages/carousel_page.dart

@@ -34,7 +34,10 @@ class _CarouselPageState extends State<CarouselPage> {
       amountOfPages: 4,
       flutterFormWidgets: [
         FlutterFormInputCarousel(
-            controller: widget.inputController, items: getCars())
+          controller: widget.inputController,
+          items: getCars(),
+          validationMessage: 'Validation error message.',
+        )
       ],
     );
   }

example/lib/example_pages/date_page.dart

@@ -46,6 +46,7 @@ class _DatePageState extends State<DatePage> {
             ),
             label: const Text("Custom date label"),
             controller: widget.dateController,
+            validationMessage: 'Please fill in a date.',
           ),
         ),
       ],

example/lib/example_pages/name_page.dart

@@ -40,6 +40,7 @@ class _NamePageState extends State<NamePage> {
           child: FlutterFormInputPlainText(
             label: const Text("First Name"),
             controller: widget.firstNameController,
+            validationMessage: 'Please fill in your first name.',
           ),
         ),
         if (widget.showLastName)
@@ -48,6 +49,7 @@ class _NamePageState extends State<NamePage> {
             child: FlutterFormInputPlainText(
               label: const Text("Last Name"),
               controller: widget.lastNameController,
+              validationMessage: 'Please fill in your last name.',
             ),
           ),
       ],

example/lib/form_example.dart

@@ -189,6 +189,7 @@ class _FormExampleState extends ConsumerState<FormExample> {
                   child: Center(
                     child: FlutterFormInputPhone(
                       controller: phoneInputController,
+                      validationMessage: 'Please fill in a valid phone number',
                     ),
                   ),
                 ),

lib/flutter_form.dart

@@ -9,4 +9,3 @@ export 'src/form.dart';
 export 'src/widgets/input/abstractions.dart';
 export 'src/widgets/input/input_types/input_types.dart';
 export 'utils/form.dart';
-export 'utils/translation_service.dart';

lib/src/widgets/input/abstractions.dart

@@ -122,6 +122,6 @@ abstract class FlutterFormInputController<T> {
   /// [onValidate] is used to validate the given input by the user.
   String? onValidate(
     T? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   );
 }

lib/src/widgets/input/input_types/input_carousel/input_carousel.dart

@@ -16,24 +16,27 @@ import 'package:flutter_input_library/flutter_input_library.dart' as input;
 class FlutterFormInputCarousel extends FlutterFormInputWidget<int> {
   const FlutterFormInputCarousel({
     required super.controller,
+    required this.validationMessage,
     required this.items,
     super.key,
     super.label,
+    this.validator,
     this.height = 425,
   });
 
   final List<Widget> items;
   final double height;
+  final String validationMessage;
+  final String? Function(int?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     return input.FlutterFormInputCarousel(
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: controller.onChanged,
       initialValue: controller.value ?? 0,
       items: items,
@@ -86,7 +89,7 @@ class FlutterFormInputCarouselController
   @override
   String? onValidate(
     int? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {}
 

lib/src/widgets/input/input_types/input_date_picker/input_date_picker.dart

@@ -33,9 +33,11 @@ class FlutterFormInputDateTime extends FlutterFormInputWidget<String> {
     required super.controller,
     required this.inputType,
     required this.dateFormat,
+    required this.validationMessage,
     super.key,
     super.label,
     this.showIcon = true,
+    this.validator,
     this.firstDate,
     this.lastDate,
     this.initialDate,
@@ -54,10 +56,11 @@ class FlutterFormInputDateTime extends FlutterFormInputWidget<String> {
   final IconData icon;
   final bool enabled;
   final bool onTapEnabled;
+  final String validationMessage;
+  final String? Function(String?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
     super.registerController(context);
 
     return input.FlutterFormInputDateTime(
@@ -71,7 +74,8 @@ class FlutterFormInputDateTime extends FlutterFormInputWidget<String> {
       inputType: inputType,
       onChanged: (value) => controller.onChanged?.call(value),
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       initialValue: controller.value,
       dateFormat: dateFormat,
       initialDate: initialDate,
@@ -143,11 +147,11 @@ class FlutterFormInputDateTimeController
   @override
   String? onValidate(
     String? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {
       if (value == null || value.isEmpty) {
-        return translator('shell.form.error.empty');
+        return validationMessage;
       }
     }
 

lib/src/widgets/input/input_types/input_email.dart

@@ -16,21 +16,23 @@ class FlutterFormInputEmail extends FlutterFormInputWidget<String> {
   /// The [key], [focusNode], [label], and [enabled] parameters are optional.
   const FlutterFormInputEmail({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
     bool? enabled,
+    this.validator,
     this.decoration,
   }) : super(
           enabled: enabled ?? true,
         );
 
   final InputDecoration? decoration;
+  final String validationMessage;
+  final String? Function(String?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     return input.FlutterFormInputPlainText(
@@ -40,7 +42,8 @@ class FlutterFormInputEmail extends FlutterFormInputWidget<String> {
         controller.onSaved(value);
       },
       focusNode: focusNode,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: (value) => controller.onChanged?.call(value),
       decoration: decoration,
     );
@@ -98,17 +101,17 @@ class FlutterFormInputEmailController
   @override
   String? onValidate(
     String? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {
       if (value == null || value.isEmpty) {
-        return translator('shell.form.error.empty');
+        return validationMessage;
       }
 
       if (!RegExp(
         r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+",
       ).hasMatch(value)) {
-        return translator('shell.form.error.email.notValid');
+        return validationMessage;
       }
     }
 

lib/src/widgets/input/input_types/input_number_picker/input_number_picker.dart

@@ -15,26 +15,29 @@ import 'package:flutter_input_library/flutter_input_library.dart' as input;
 class FlutterFormInputNumberPicker extends FlutterFormInputWidget<int> {
   const FlutterFormInputNumberPicker({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.label,
+    this.validator,
     this.minValue = 0,
     this.maxValue = 100,
   }) : assert(minValue < maxValue, 'minValue must be less than maxValue');
 
   final int minValue;
   final int maxValue;
+  final String validationMessage;
+  final String? Function(int?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     return input.FlutterFormInputNumberPicker(
       minValue: minValue,
       maxValue: maxValue,
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: (value) => controller.onChanged?.call(value),
       initialValue: controller.value ?? minValue,
     );
@@ -91,7 +94,7 @@ class FlutterFormInputNumberPickerController
   @override
   String? onValidate(
     int? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {}
 

lib/src/widgets/input/input_types/input_password/input_password.dart

@@ -12,29 +12,31 @@ import 'package:flutter_input_library/flutter_input_library.dart' as input;
 class FlutterFormInputPassword extends FlutterFormInputWidget<String> {
   const FlutterFormInputPassword({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
     bool? enabled,
+    this.validator,
     this.decoration,
   }) : super(
           enabled: enabled ?? true,
         );
 
   final InputDecoration? decoration;
+  final String validationMessage;
+  final String? Function(String?)? validator;
 
   @override
   Widget build(BuildContext context) {
     super.registerController(context);
-
-    var translator = getTranslator(context);
-
     return input.FlutterFormInputPassword(
       enabled: enabled,
       initialValue: controller.value,
       focusNode: focusNode,
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: (value) => controller.onChanged?.call(value),
       onFieldSubmitted: (value) => controller.onSubmit?.call(value),
       decoration: decoration,
@@ -93,15 +95,15 @@ class FlutterFormInputPasswordController
   @override
   String? onValidate(
     String? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {
       if (value == null || value.isEmpty) {
-        return translator('Field can not be empty');
+        return validationMessage;
       }
 
       if (value.length < 6) {
-        return translator('Field should be at least 6 characters long');
+        return validationMessage;
       }
     }
 

lib/src/widgets/input/input_types/input_phone.dart

@@ -14,12 +14,14 @@ import 'package:flutter_input_library/flutter_input_library.dart' as input;
 class FlutterFormInputPhone extends FlutterFormInputWidget<input.PhoneNumber?> {
   const FlutterFormInputPhone({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
     this.decoration,
     this.enabled = true,
     this.numberFieldStyle,
+    this.validator,
     this.dialCodeSelectorStyle,
     this.dialCodeSelectorPadding = const EdgeInsets.only(top: 6),
     this.textAlignVertical = TextAlignVertical.top,
@@ -32,11 +34,11 @@ class FlutterFormInputPhone extends FlutterFormInputWidget<input.PhoneNumber?> {
   final TextStyle? dialCodeSelectorStyle;
   final EdgeInsets dialCodeSelectorPadding;
   final TextAlignVertical textAlignVertical;
+  final String validationMessage;
+  final String? Function(PhoneNumber?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     var inputDecoration = decoration ??
@@ -50,7 +52,8 @@ class FlutterFormInputPhone extends FlutterFormInputWidget<input.PhoneNumber?> {
       enabled: enabled,
       initialValue: controller.value,
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: (value) => controller.onChanged?.call(value),
       onFieldSubmitted: (value) => controller.onSubmit?.call(value),
       decoration: inputDecoration,
@@ -100,11 +103,11 @@ class FlutterFormInputPhoneController
   @override
   String? onValidate(
     input.PhoneNumber? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {
       if (value == null || value.number == null) {
-        return translator('Field can not be empty');
+        return validationMessage;
       }
     }
 

lib/src/widgets/input/input_types/input_plain_text.dart

@@ -20,6 +20,7 @@ class FlutterFormInputPlainText extends FlutterFormInputWidget<String> {
   /// [enabled], [style], and [textCapitalization] parameters are optional.
   const FlutterFormInputPlainText({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
@@ -30,6 +31,7 @@ class FlutterFormInputPlainText extends FlutterFormInputWidget<String> {
     this.scrollPadding,
     this.maxLength,
     this.keyboardType,
+    this.validator,
     this.enabled = true,
     this.style,
     this.textCapitalization = TextCapitalization.none,
@@ -46,11 +48,11 @@ class FlutterFormInputPlainText extends FlutterFormInputWidget<String> {
   final bool enabled;
   final TextStyle? style;
   final TextCapitalization textCapitalization;
+  final String validationMessage;
+  final String? Function(String?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     var inputDecoration = decoration ??
@@ -65,7 +67,8 @@ class FlutterFormInputPlainText extends FlutterFormInputWidget<String> {
       initialValue: controller.value,
       focusNode: focusNode,
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       onChanged: (value) => controller.onChanged?.call(value),
       onFieldSubmitted: (value) => controller.onSubmit?.call(value),
       decoration: inputDecoration,
@@ -89,10 +92,12 @@ class FlutterFormInputPlainText extends FlutterFormInputWidget<String> {
 class FlutterFormInputMultiLine extends StatelessWidget {
   const FlutterFormInputMultiLine({
     required this.controller,
+    required this.validationMessage,
     super.key,
     this.focusNode,
     this.label,
     this.hint,
+    this.validator,
     this.maxCharacters,
     this.enabled = true,
     this.textCapitalization = TextCapitalization.sentences,
@@ -119,11 +124,12 @@ class FlutterFormInputMultiLine extends StatelessWidget {
   /// The capitalization behavior for the input field.
   final TextCapitalization textCapitalization;
 
-  @override
+  final String validationMessage;
-  Widget build(BuildContext context) {
-    var translator = getTranslator(context);
 
-    return input.FlutterFormInputMultiLine(
+  final String? Function(String?)? validator;
+
+  @override
+  Widget build(BuildContext context) => input.FlutterFormInputMultiLine(
         enabled: enabled,
         label: label,
         hint: hint,
@@ -132,11 +138,11 @@ class FlutterFormInputMultiLine extends StatelessWidget {
         maxCharacters: maxCharacters,
         onChanged: controller.onChanged,
         onSaved: controller.onSaved,
-      validator: (v) => controller.onValidate(v, translator),
+        validator: validator ??
+            (value) => controller.onValidate(value, validationMessage),
         textCapitalization: textCapitalization,
       );
 }
-}
 
 /// Controller for plain text used by a [FlutterFormInputWidget] used in a
 /// [FlutterForm].
@@ -189,11 +195,11 @@ class FlutterFormInputPlainTextController
   @override
   String? onValidate(
     String? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {
       if (value == null || value.isEmpty) {
-        return translator('Field can not be empty');
+        return validationMessage;
       }
     }
 

lib/src/widgets/input/input_types/input_slider/input_slider.dart

@@ -19,26 +19,29 @@ class FlutterFormInputSlider extends FlutterFormInputWidget<double> {
   /// The [enabled] parameter specifies whether the input field is enabled.
   const FlutterFormInputSlider({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
+    this.validator,
     this.minValue = 0,
     this.maxValue = 100,
   }) : assert(minValue < maxValue, 'minValue must be less than maxValue');
 
   final int minValue;
   final int maxValue;
+  final String validationMessage;
+  final String? Function(double?)? validator;
 
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     return input.FlutterFormInputSlider(
       focusNode: focusNode,
       onSaved: controller.onSaved,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
     );
   }
 }
@@ -93,7 +96,7 @@ class FlutterFormInputSliderController
   @override
   String? onValidate(
     double? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) {
     if (mandatory) {}
 

lib/src/widgets/input/input_types/input_switch/input_switch.dart

@@ -14,22 +14,26 @@ import 'package:flutter_input_library/flutter_input_library.dart' as input;
 class FlutterFormInputSwitch extends FlutterFormInputWidget<bool> {
   const FlutterFormInputSwitch({
     required super.controller,
+    required this.validationMessage,
     super.key,
     super.focusNode,
     super.label,
+    this.validator,
   });
 
+  final String validationMessage;
+  final String? Function(bool?)? validator;
+
   @override
   Widget build(BuildContext context) {
-    var translator = getTranslator(context);
-
     super.registerController(context);
 
     return input.FlutterFormInputBool(
       focusNode: focusNode,
       onSaved: controller.onSaved,
       onChanged: controller.onChanged,
-      validator: (value) => controller.onValidate(value, translator),
+      validator: validator ??
+          (value) => controller.onValidate(value, validationMessage),
       initialValue: controller.value ?? false,
       widgetType: input.BoolWidgetType.switchWidget,
     );
@@ -86,7 +90,7 @@ class FlutterFormInputSwitchController
   @override
   String? onValidate(
     bool? value,
-    String Function(String, {List<String>? params}) translator,
+    String validationMessage,
   ) =>
       null;
 }

lib/utils/translation_service.dart

@@ -1,48 +0,0 @@
-// SPDX-FileCopyrightText: 2022 Iconica
-//
-// SPDX-License-Identifier: BSD-3-Clause
-
-import 'package:flutter/material.dart';
-
-abstract class TranslationService {
-  TranslationService._();
-
-  String translate(
-    BuildContext context,
-    String key, {
-    List<String>? params,
-  });
-
-  String number(double value);
-}
-
-typedef Translator = String Function(
-  String, {
-  List<String>? params,
-});
-
-class ShellTranslationService implements TranslationService {
-  @override
-  String number(double value) => value.toStringAsFixed(2);
-
-  @override
-  String translate(BuildContext context, String key, {List<String>? params}) =>
-      key;
-}
-
-Translator getTranslator(BuildContext context) {
-  try {
-    var translator = ShellTranslationService().translate;
-    return (
-      String key, {
-      List<String>? params,
-    }) =>
-        translator(context, key, params: params);
-  } on Exception catch (_) {
-    return (
-      String key, {
-      List<String>? params,
-    }) =>
-        key;
-  }
-}

test/flutter_form_test.dart

@@ -56,6 +56,7 @@ void main() {
                     child: FlutterFormInputPlainText(
                       label: const Text('Field1Label'),
                       controller: testField1Controller,
+                      validationMessage: 'Please fill in this field',
                     ),
                   ),
                 ),
@@ -64,6 +65,7 @@ void main() {
                     child: FlutterFormInputPlainText(
                       label: const Text('Field2Label'),
                       controller: testField2Controller,
+                      validationMessage: 'Please fill in this field',
                     ),
                   ),
                 ),
@@ -154,6 +156,7 @@ void main() {
                     child: FlutterFormInputPlainText(
                       label: const Text('Field1Label'),
                       controller: testField1Controller,
+                      validationMessage: 'Please fill in this field',
                     ),
                   ),
                 ),
@@ -162,6 +165,7 @@ void main() {
                     child: FlutterFormInputPlainText(
                       label: const Text('Field2Label'),
                       controller: testField2Controller,
+                      validationMessage: 'Please fill in this field',
                     ),
                   ),
                 ),
@@ -260,6 +264,7 @@ void main() {
                     child: FlutterFormInputPlainText(
                       label: const Text('Field1Label'),
                       controller: testField1Controller,
+                      validationMessage: 'Field can not be empty',
                     ),
                   ),
                 ),