Adding text editing controllers for email and password in signInScreen

packages/firebase_ui_auth/lib/src/screens/internal/login_screen.dart

@@ -57,6 +57,14 @@ class LoginScreen extends StatelessWidget {
   /// {@macro ui.auth.screens.responsive_page.max_width}
   final double? maxWidth;
 
+    /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? emailTextEditingController;
+
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? passwordTextEditingController;
+
   const LoginScreen({
     super.key,
     required this.action,
@@ -77,6 +85,8 @@ class LoginScreen extends StatelessWidget {
     this.styles,
     this.showPasswordVisibilityToggle = false,
     this.maxWidth,
+    this.emailTextEditingController,
+    this.passwordTextEditingController,
   });
 
   @override
@@ -86,6 +96,8 @@ class LoginScreen extends StatelessWidget {
       child: Padding(
         padding: const EdgeInsets.all(30),
         child: LoginView(
+          emailTextEditingController: emailTextEditingController,
+          passwordTextEditingController: passwordTextEditingController,
           key: loginViewKey,
           action: action,
           auth: auth,

packages/firebase_ui_auth/lib/src/screens/sign_in_screen.dart

@@ -101,11 +101,21 @@ class SignInScreen extends MultiProviderScreen {
   /// {@macro ui.auth.screens.responsive_page.max_width}
   final double? maxWidth;
 
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller 
+  final TextEditingController? emailTextEditingController;
+
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller 
+  final TextEditingController? passwordTextEditingController;
+
   /// {@macro ui.auth.screens.sign_in_screen}
   const SignInScreen({
     super.key,
     super.providers,
     super.auth,
+    this.emailTextEditingController,
+    this.passwordTextEditingController,
     this.headerMaxExtent,
     this.headerBuilder,
     this.sideBuilder,
@@ -161,6 +171,8 @@ class SignInScreen extends MultiProviderScreen {
       actions: actions,
       child: LoginScreen(
         styles: styles,
+        emailTextEditingController: emailTextEditingController,
+        passwordTextEditingController: passwordTextEditingController,
         loginViewKey: loginViewKey,
         action: AuthAction.signIn,
         providers: providers,

packages/firebase_ui_auth/lib/src/views/login_view.dart

@@ -58,6 +58,14 @@ class LoginView extends StatefulWidget {
   /// {@macro ui.auth.widgets.email_from.showPasswordVisibilityToggle}
   final bool showPasswordVisibilityToggle;
 
+    /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? emailTextEditingController;
+
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? passwordTextEditingController;
+
   /// {@macro ui.auth.views.login_view}
   const LoginView({
     super.key,
@@ -72,6 +80,8 @@ class LoginView extends StatefulWidget {
     this.subtitleBuilder,
     this.actionButtonLabelOverride,
     this.showPasswordVisibilityToggle = false,
+    this.emailTextEditingController,
+    this.passwordTextEditingController,
   });
 
   @override
@@ -220,6 +230,8 @@ class _LoginViewState extends State<LoginView> {
               if (provider is EmailAuthProvider) ...[
                 const SizedBox(height: 8),
                 EmailForm(
+                  passwordTextEditingController: widget.passwordTextEditingController,
+                  emailTextEditingController: widget.emailTextEditingController,
                   key: ValueKey(_action),
                   auth: widget.auth,
                   action: _action,

packages/firebase_ui_auth/lib/src/widgets/email_form.dart

@@ -100,6 +100,14 @@ class EmailForm extends StatelessWidget {
   /// A label that would be used for the "Sign in" button.
   final String? actionButtonLabelOverride;
 
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? emailTextEditingController;
+
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? passwordTextEditingController;
+
   /// An object that is being used to apply styling configuration to the email
   /// form.
   ///
@@ -140,6 +148,8 @@ class EmailForm extends StatelessWidget {
   const EmailForm({
     super.key,
     this.action,
+    this.emailTextEditingController,
+    this.passwordTextEditingController,
     this.auth,
     this.provider,
     this.onSubmit,
@@ -160,6 +170,8 @@ class EmailForm extends StatelessWidget {
       actionButtonLabelOverride: actionButtonLabelOverride,
       style: style,
       showPasswordVisibilityToggle: showPasswordVisibilityToggle,
+      emailTextEditingController: emailTextEditingController,
+      passwordTextEditingController: passwordTextEditingController,
     );
 
     return AuthFlowBuilder<EmailAuthController>(
@@ -186,6 +198,14 @@ class _SignInFormContent extends StatefulWidget {
 
   final EmailFormStyle? style;
 
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? emailTextEditingController;
+
+  /// {@macro ui.auth.screens.sign_in_screen}
+  /// Email text editing controller
+  final TextEditingController? passwordTextEditingController;
+
   const _SignInFormContent({
     this.auth,
     this.onSubmit,
@@ -195,22 +215,32 @@ class _SignInFormContent extends StatefulWidget {
     this.actionButtonLabelOverride,
     this.style,
     this.showPasswordVisibilityToggle = false,
+    this.emailTextEditingController,
+    this.passwordTextEditingController,
   });
 
   @override
   _SignInFormContentState createState() => _SignInFormContentState();
 }
 
 class _SignInFormContentState extends State<_SignInFormContent> {
-  final emailCtrl = TextEditingController();
-  final passwordCtrl = TextEditingController();
+  late final TextEditingController emailCtrl;
+  late final TextEditingController passwordCtrl;
   final confirmPasswordCtrl = TextEditingController();
   final formKey = GlobalKey<FormState>();
 
   final emailFocusNode = FocusNode();
   final passwordFocusNode = FocusNode();
   final confirmPasswordFocusNode = FocusNode();
 
+  @override
+  void initState() {
+    emailCtrl = widget.emailTextEditingController ?? TextEditingController();
+    passwordCtrl =
+        widget.passwordTextEditingController ?? TextEditingController();
+    super.initState();
+  }
+
   String _chooseButtonLabel() {
     final ctrl = AuthController.ofType<EmailAuthController>(context);
     final l = FirebaseUILocalizations.labelsOf(context);