Add TextInputType.none (#83974)

packages/flutter/lib/src/services/text_input.dart

@@ -174,14 +174,17 @@ class TextInputType {
   /// [TYPE_TEXT_VARIATION_POSTAL_ADDRESS](https://developer.android.com/reference/android/text/InputType#TYPE_TEXT_VARIATION_POSTAL_ADDRESS).
   static const TextInputType streetAddress = TextInputType._(9);
 
+  /// Prevent the OS from showing the on-screen virtual keyboard.
+  static const TextInputType none = TextInputType._(10);
+
   /// All possible enum values.
   static const List<TextInputType> values = <TextInputType>[
-    text, multiline, number, phone, datetime, emailAddress, url, visiblePassword, name, streetAddress,
+    text, multiline, number, phone, datetime, emailAddress, url, visiblePassword, name, streetAddress, none,
   ];
 
   // Corresponding string name for each of the [values].
   static const List<String> _names = <String>[
-    'text', 'multiline', 'number', 'phone', 'datetime', 'emailAddress', 'url', 'visiblePassword', 'name', 'address',
+    'text', 'multiline', 'number', 'phone', 'datetime', 'emailAddress', 'url', 'visiblePassword', 'name', 'address', 'none',
   ];
 
   // Enum value name, this is what enum.toString() would normally return.

packages/flutter/test/services/text_input_test.dart

@@ -154,6 +154,7 @@ void main() {
       expect(TextInputType.visiblePassword.toString(), 'TextInputType(name: TextInputType.visiblePassword, signed: null, decimal: null)');
       expect(TextInputType.name.toString(), 'TextInputType(name: TextInputType.name, signed: null, decimal: null)');
       expect(TextInputType.streetAddress.toString(), 'TextInputType(name: TextInputType.address, signed: null, decimal: null)');
+      expect(TextInputType.none.toString(), 'TextInputType(name: TextInputType.none, signed: null, decimal: null)');
 
       expect(text == number, false);
       expect(number == number2, true);
@@ -181,6 +182,7 @@ void main() {
       expect(TextInputType.visiblePassword.index, 7);
       expect(TextInputType.name.index, 8);
       expect(TextInputType.streetAddress.index, 9);
+      expect(TextInputType.none.index, 10);
 
       expect(TextEditingValue.empty.toString(),
           'TextEditingValue(text: \u2524\u251C, selection: ${const TextSelection.collapsed(offset: -1)}, composing: ${TextRange.empty})');