Add back the autovalidate class property (#66267)

* Add back autovalidate property

* Add autovalidate property back (include tests)

* Fix typos

* One more test :)

packages/flutter/lib/src/widgets/form.dart

@@ -77,11 +77,11 @@ class Form extends StatefulWidget {
     Key? key,
     required this.child,
     @Deprecated(
-      'Use autoValidateMode parameter which provide more specific '
-      'behaviour related to auto validation. '
+      'Use autoValidateMode parameter which provides more specific '
+      'behavior related to auto validation. '
       'This feature was deprecated after v1.19.0.'
     )
-    bool autovalidate = false,
+    this.autovalidate = false,
     this.onWillPop,
     this.onChanged,
     AutovalidateMode? autovalidateMode,
@@ -92,9 +92,8 @@ class Form extends StatefulWidget {
          autovalidate == true && autovalidateMode == null,
          'autovalidate and autovalidateMode should not be used together.'
        ),
-       autovalidateMode = autovalidate
-           ? AutovalidateMode.always
-           : (autovalidateMode ?? AutovalidateMode.disabled),
+       autovalidateMode = autovalidateMode ??
+         (autovalidate ? AutovalidateMode.always : AutovalidateMode.disabled),
        super(key: key);
 
   /// Returns the closest [FormState] which encloses the given context.
@@ -141,6 +140,15 @@ class Form extends StatefulWidget {
   /// {@macro flutter.widgets.form.autovalidateMode}
   final AutovalidateMode autovalidateMode;
 
+  /// Used to enable/disable form fields auto validation and update their error
+  /// text.
+  @Deprecated(
+    'Use autoValidateMode parameter which provides more specific '
+    'behavior related to auto validation. '
+    'This feature was deprecated after v1.19.0.'
+  )
+  final bool autovalidate;
+
   @override
   FormState createState() => FormState();
 }
@@ -318,11 +326,11 @@ class FormField<T> extends StatefulWidget {
     this.validator,
     this.initialValue,
     @Deprecated(
-      'Use autoValidateMode parameter which provide more specific '
-      'behaviour related to auto validation. '
+      'Use autoValidateMode parameter which provides more specific '
+      'behavior related to auto validation. '
       'This feature was deprecated after v1.19.0.'
     )
-    bool autovalidate = false,
+    this.autovalidate = false,
     this.enabled = true,
     AutovalidateMode? autovalidateMode,
   }) : assert(builder != null),
@@ -331,9 +339,8 @@ class FormField<T> extends StatefulWidget {
          autovalidate == true && autovalidateMode == null,
          'autovalidate and autovalidateMode should not be used together.'
        ),
-       autovalidateMode = autovalidate
-           ? AutovalidateMode.always
-           : (autovalidateMode ?? AutovalidateMode.disabled),
+        autovalidateMode = autovalidateMode ??
+          (autovalidate ? AutovalidateMode.always : AutovalidateMode.disabled),
        super(key: key);
 
   /// An optional method to call with the final value when the form is saved via
@@ -385,6 +392,15 @@ class FormField<T> extends StatefulWidget {
   /// {@endtemplate}
   final AutovalidateMode autovalidateMode;
 
+  /// Used to enable/disable auto validation and update their error
+  /// text.
+  @Deprecated(
+    'Use autoValidateMode parameter which provides more specific '
+    'behavior related to auto validation. '
+    'This feature was deprecated after v1.19.0.'
+  )
+  final bool autovalidate;
+
   @override
   FormFieldState<T> createState() => FormFieldState<T>();
 }

packages/flutter/test/widgets/form_test.dart

@@ -886,4 +886,87 @@ void main() {
     expect(fieldValue, '123456');
     expect(formKey.currentState.validate(), isFalse);
   });
+
+  testWidgets('FormField.autovalidate parameter is passed into class the property', (WidgetTester tester) async {
+    String errorText(String value) => '$value/error';
+    const ObjectKey widgetKey = ObjectKey('key');
+
+    Widget builder({@required bool autovalidate}) {
+      return MaterialApp(
+        home: MediaQuery(
+          data: const MediaQueryData(devicePixelRatio: 1.0),
+          child: Directionality(
+            textDirection: TextDirection.ltr,
+            child: Center(
+              child: Material(
+                child: FormField<String>(
+                  key: widgetKey,
+                  initialValue: 'foo',
+                  autovalidate: autovalidate,
+                  builder: (FormFieldState<String> state) {
+                    return Container();
+                  },
+                  validator: errorText,
+                ),
+              ),
+            ),
+          ),
+        ),
+      );
+    }
+
+    // When autovalidate is true
+    await tester.pumpWidget(builder(autovalidate: true));
+
+    final Finder formFieldFinder = find.byKey(widgetKey);
+    FormField<String> formField = tester.widget(formFieldFinder);
+    expect(formField.autovalidate, isTrue);
+    expect(formField.autovalidateMode, equals(AutovalidateMode.always));
+
+    // When autovalidate is false
+    await tester.pumpWidget(builder(autovalidate: false));
+
+    formField = tester.widget(formFieldFinder);
+    expect(formField.autovalidate, isFalse);
+    expect(formField.autovalidateMode, equals(AutovalidateMode.disabled));
+  });
+
+  testWidgets('Form.autovalidate parameter is passed into class the property', (WidgetTester tester) async {
+    const ObjectKey widgetKey = ObjectKey('key');
+
+    Widget builder({@required bool autovalidate}) {
+      return MaterialApp(
+        home: MediaQuery(
+          data: const MediaQueryData(devicePixelRatio: 1.0),
+          child: Directionality(
+            textDirection: TextDirection.ltr,
+            child: Center(
+              child: Material(
+                child: Form(
+                  key: widgetKey,
+                  autovalidate: autovalidate,
+                  child: Container(),
+                ),
+              ),
+            ),
+          ),
+        ),
+      );
+    }
+
+    // When autovalidate is true
+    await tester.pumpWidget(builder(autovalidate: true));
+
+    final Finder formFinder = find.byKey(widgetKey);
+    Form formWidget = tester.widget(formFinder);
+    expect(formWidget.autovalidate, isTrue);
+    expect(formWidget.autovalidateMode, equals(AutovalidateMode.always));
+
+    // When autovalidate is false
+    await tester.pumpWidget(builder(autovalidate: false));
+
+    formWidget = tester.widget(formFinder);
+    expect(formWidget.autovalidate, isFalse);
+    expect(formWidget.autovalidateMode, equals(AutovalidateMode.disabled));
+  });
 }