upd

optimus/lib/src/form/input_field.dart

@@ -83,6 +83,10 @@ class OptimusInputField extends StatefulWidget {
   final int? maxCharacters;
 
   /// {@macro flutter.widgets.editableText.minLines}
+  ///
+  /// If the input is multi-lined we recommend you to set the [keyboardType] to
+  /// [TextInputType.multiline] otherwise the move to the next line won't work
+  /// properly.
   final int? minLines;
   final TextEditingController? controller;
   final String? error;

storybook/lib/stories/input.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
 import 'package:optimus/optimus.dart';
 import 'package:storybook/utils.dart';
 import 'package:storybook_flutter/storybook_flutter.dart';
@@ -45,6 +45,11 @@ final Story inputStory = Story(
     }
     final minLines =
         k.sliderInt(label: 'Min lines', initial: 1, min: 1, max: 10);
+    final keyboardType = k.options(
+      label: 'Keyboard Type:',
+      initial: null,
+      options: KeyboardType.values.toOptions().withEmpty(),
+    );
     final inline = k.boolean(label: 'Inline', initial: false);
     final autoCollapse = k.boolean(label: 'Auto Collapse', initial: true);
 
@@ -65,6 +70,7 @@ final Story inputStory = Story(
           maxCharacters: maxChars,
           minLines: minLines,
           maxLines: minLines,
+          keyboardType: keyboardType?.inputType,
           prefix: prefix.isNotEmpty ? Text(prefix) : null,
           suffix: suffix.isNotEmpty ? Text(suffix) : null,
           leading: leadingIcon == null ? null : Icon(leadingIcon),
@@ -92,3 +98,16 @@ final Story inputStory = Story(
     );
   },
 );
+
+enum KeyboardType {
+  text(TextInputType.text),
+  multiline(TextInputType.multiline),
+  number(TextInputType.number),
+  phone(TextInputType.phone),
+  datetime(TextInputType.datetime),
+  emailAddress(TextInputType.emailAddress),
+  url(TextInputType.url);
+
+  const KeyboardType(this.inputType);
+  final TextInputType inputType;
+}