feat: #1480 support error builder

.github/workflows/base-beta.yaml

@@ -0,0 +1,39 @@
+name: Base (beta)
+
+on:
+  schedule:
+    - cron: '0 0 */15 * *' # Runs every 15 days for verifying changes on Flutter beta channel
+  push:
+    branches: [beta]
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+-*'
+
+  pull_request:
+    branches: [beta]
+
+  workflow_dispatch:
+
+# This ensures that previous jobs for the PR are canceled when PR is updated
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    uses: flutter-form-builder-ecosystem/.github/.github/workflows/minimal-quality.yaml@main
+    with:
+      codecov-name: flutter_form_builder
+      enable-fix-tests: true
+      fvm-flavor: beta
+  example:
+    uses: flutter-form-builder-ecosystem/.github/.github/workflows/build-examples.yaml@main
+    with:
+      fvm-flavor: beta
+
+
+  deployment:
+    permissions:
+      id-token: write
+    uses: flutter-form-builder-ecosystem/.github/.github/workflows/deployment.yaml@main
+    if: ${{ github.ref_type == 'tag' }}
+    needs: [build, example]

.github/workflows/base.yaml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [main]
     tags:
-      - '[0-9]+.[0-9]+.[0-9]+*'
+      - '[0-9]+.[0-9]+.[0-9]+'
 
   pull_request:
     branches: [main]

example/lib/sources/complete_form.dart

@@ -89,6 +89,20 @@ class _CompleteFormState extends State<CompleteForm> {
                   validator: FormBuilderValidators.compose([
                     FormBuilderValidators.min(6),
                   ]),
+                  errorBuilder: (context, errorText) => TextButton(
+                    onPressed: () {
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(
+                          content: Text(errorText),
+                          duration: const Duration(seconds: 2),
+                        ),
+                      );
+                    },
+                    child: Text(
+                      errorText,
+                      style: const TextStyle(color: Colors.red),
+                    ),
+                  ),
                   onChanged: _onChanged,
                   min: 0.0,
                   max: 10.0,

example/pubspec.lock

@@ -5,10 +5,10 @@ packages:
     dependency: transitive
     description:
       name: async
-      sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
       url: "https://pub.dev"
     source: hosted
-    version: "2.12.0"
+    version: "2.13.0"
   boolean_selector:
     dependency: transitive
     description:

lib/src/fields/form_builder_checkbox.dart

@@ -106,6 +106,7 @@ class FormBuilderCheckbox extends FormBuilderFieldDecoration<bool> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.title,
     this.activeColor,
     this.autofocus = false,

lib/src/fields/form_builder_checkbox_group.dart

@@ -45,6 +45,7 @@ class FormBuilderCheckboxGroup<T> extends FormBuilderFieldDecoration<List<T>> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.options,
     this.activeColor,
     this.checkColor,

lib/src/fields/form_builder_choice_chips.dart

@@ -359,6 +359,7 @@ class FormBuilderChoiceChips<T> extends FormBuilderFieldDecoration<T> {
     super.onChanged,
     super.valueTransformer,
     super.onReset,
+    super.errorBuilder,
     this.alignment = WrapAlignment.start,
     this.avatarBorder = const CircleBorder(),
     this.backgroundColor,

lib/src/fields/form_builder_date_range_picker.dart

@@ -79,6 +79,7 @@ class FormBuilderDateRangePicker
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.firstDate,
     required this.lastDate,
     this.format,

lib/src/fields/form_builder_date_time_picker.dart

@@ -138,6 +138,7 @@ class FormBuilderDateTimePicker extends FormBuilderFieldDecoration<DateTime> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     this.inputType = InputType.both,
     this.scrollPadding = const EdgeInsets.all(20.0),
     this.cursorWidth = 2.0,

lib/src/fields/form_builder_dropdown.dart

@@ -264,6 +264,7 @@ class FormBuilderDropdown<T> extends FormBuilderFieldDecoration<T> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.items,
     this.isExpanded = true,
     this.isDense = true,

lib/src/fields/form_builder_filter_chips.dart

@@ -46,6 +46,7 @@ class FormBuilderFilterChips<T> extends FormBuilderFieldDecoration<List<T>> {
     super.initialValue,
     required super.name,
     super.restorationId,
+    super.errorBuilder,
     required this.options,
     this.alignment = WrapAlignment.start,
     this.avatarBorder = const CircleBorder(),

lib/src/fields/form_builder_radio_group.dart

@@ -38,6 +38,11 @@ class FormBuilderRadioGroup<T> extends FormBuilderFieldDecoration<T> {
     required super.name,
     required this.options,
     super.initialValue,
+    super.onChanged,
+    super.valueTransformer,
+    super.onReset,
+    super.restorationId,
+    super.errorBuilder,
     this.activeColor,
     this.controlAffinity = ControlAffinity.leading,
     this.disabled,
@@ -54,10 +59,6 @@ class FormBuilderRadioGroup<T> extends FormBuilderFieldDecoration<T> {
     this.wrapSpacing = 0.0,
     this.wrapTextDirection,
     this.wrapVerticalDirection = VerticalDirection.down,
-    super.onChanged,
-    super.valueTransformer,
-    super.onReset,
-    super.restorationId,
     this.itemDecoration,
   }) : super(
          builder: (FormFieldState<T?> field) {

lib/src/fields/form_builder_range_slider.dart

@@ -174,6 +174,7 @@ class FormBuilderRangeSlider extends FormBuilderFieldDecoration<RangeValues> {
     super.autovalidateMode = AutovalidateMode.disabled,
     super.onReset,
     super.focusNode,
+    super.errorBuilder,
     required this.min,
     required this.max,
     this.divisions,

lib/src/fields/form_builder_slider.dart

@@ -195,6 +195,7 @@ class FormBuilderSlider extends FormBuilderFieldDecoration<double> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.min,
     required this.max,
     this.divisions,

lib/src/fields/form_builder_switch.dart

@@ -103,6 +103,7 @@ class FormBuilderSwitch extends FormBuilderFieldDecoration<bool> {
     super.onReset,
     super.focusNode,
     super.restorationId,
+    super.errorBuilder,
     required this.title,
     this.activeColor,
     this.activeTrackColor,

lib/src/fields/form_builder_text_field.dart

@@ -379,6 +379,7 @@ class FormBuilderTextField extends FormBuilderFieldDecoration<String> {
     super.focusNode,
     super.restorationId,
     String? initialValue,
+    super.errorBuilder,
     this.readOnly = false,
     this.maxLines = 1,
     this.obscureText = false,

lib/src/form_builder_field.dart

@@ -53,6 +53,7 @@ class FormBuilderField<T> extends FormField<T> {
     super.validator,
     super.restorationId,
     required super.builder,
+    super.errorBuilder,
     required this.name,
     this.valueTransformer,
     this.onChanged,

lib/src/form_builder_field_decoration.dart

@@ -19,6 +19,7 @@ class FormBuilderFieldDecoration<T> extends FormBuilderField<T> {
     super.onChanged,
     super.onReset,
     super.focusNode,
+    super.errorBuilder,
     required super.builder,
     this.decoration = const InputDecoration(),
   }) : assert(
@@ -45,15 +46,22 @@ class FormBuilderFieldDecorationState<
   F get widget => super.widget as F;
 
   /// Get the decoration with the current state
-  InputDecoration get decoration => widget.decoration.copyWith(
-    // Read only allow show error to support property skipDisabled
-    errorText:
+  InputDecoration get decoration {
+    final String? efectiveErrorText =
         widget.enabled || readOnly
             ? widget.decoration.errorText ?? errorText
-            : null,
-    enabled:
-        widget.decoration.enabled ? widget.enabled : widget.decoration.enabled,
-  );
+            : null;
+
+    return widget.decoration.copyWith(
+      // Read only allow show error to support property skipDisabled
+      errorText: widget.errorBuilder != null ? null : efectiveErrorText,
+      error:
+          widget.errorBuilder != null && efectiveErrorText != null
+              ? widget.errorBuilder!(context, efectiveErrorText)
+              : null,
+      enabled: widget.decoration.enabled ? widget.enabled : false,
+    );
+  }
 
   @override
   bool get hasError => super.hasError || widget.decoration.errorText != null;

pubspec.lock

@@ -5,10 +5,10 @@ packages:
     dependency: transitive
     description:
       name: async
-      sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
       url: "https://pub.dev"
     source: hosted
-    version: "2.12.0"
+    version: "2.13.0"
   boolean_selector:
     dependency: transitive
     description:

test/src/form_builder_field_decoration_test.dart

@@ -43,6 +43,53 @@ void main() {
       // The field should be valid again
       expect(decorationFieldKey.currentState?.isValid, isTrue);
     });
+
+    testWidgets('when set errorBuilder then show a custom widget on error', (
+      widgetTester,
+    ) async {
+      final decorationFieldKey = GlobalKey<FormBuilderFieldDecorationState>();
+      const name = 'testField';
+      const errorTextField = 'error text field';
+      final errorTextKey = Key('errorTextKey');
+      final widget = FormBuilderFieldDecoration<String>(
+        key: decorationFieldKey,
+        name: name,
+        errorBuilder: (context, errorText) {
+          return Text(
+            errorText,
+            key: errorTextKey,
+            style: const TextStyle(color: Colors.red),
+          );
+        },
+        builder: (FormFieldState<String?> field) {
+          return InputDecorator(
+            decoration: (field as FormBuilderFieldDecorationState).decoration,
+            child: TextField(
+              onChanged: (value) {
+                field.didChange(value);
+              },
+            ),
+          );
+        },
+      );
+
+      await widgetTester.pumpWidget(buildTestableFieldWidget(widget));
+
+      // Initially, the field should be valid
+      expect(decorationFieldKey.currentState?.isValid, isTrue);
+
+      decorationFieldKey.currentState?.invalidate(errorTextField);
+
+      // The field should be invalid
+      expect(decorationFieldKey.currentState?.isValid, isFalse);
+
+      await widgetTester.pumpAndSettle();
+
+      // Check if the custom error widget is displayed
+      expect(find.text(errorTextField), findsOneWidget);
+      expect(find.byKey(errorTextKey), findsOneWidget);
+    });
+
     group('decoration enabled -', () {
       testWidgets(
         'when change the error text then the field should be invalid',