using text capitalization value in web (flutter#19564)

* using text capitalization value in web engine

* update editing state

* add capitalization support to autofill fields

* add autocapitalize attribute for mobile browsers which effects on screen keyboards

* removing changes on the input value. only keeping onscreen keyboard changes

* update unit tests. tests are added for ios-safari. android chrome is still not supported

* changing license files this time don't update LICENSES file

* Update licenses_flutter

* addresing reviewer comments

Author: nturgut

ci/licenses_golden/licenses_flutter

@@ -521,6 +521,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/text/word_break_properties.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/text/word_breaker.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/text_editing/autofill_hint.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/text_editing/input_type.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/text_editing/text_capitalization.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/text_editing/text_editing.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/util.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/validators.dart

lib/web_ui/lib/src/engine.dart

@@ -129,6 +129,7 @@ part 'engine/text/word_break_properties.dart';
 part 'engine/text/word_breaker.dart';
 part 'engine/text_editing/autofill_hint.dart';
 part 'engine/text_editing/input_type.dart';
+part 'engine/text_editing/text_capitalization.dart';
 part 'engine/text_editing/text_editing.dart';
 part 'engine/util.dart';
 part 'engine/validators.dart';

lib/web_ui/lib/src/engine/text_editing/text_capitalization.dart

@@ -0,0 +1,91 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of engine;
+
+/// Controls the capitalization of the text.
+///
+/// This corresponds to Flutter's [TextCapitalization].
+///
+/// Uses `text-transform` css property.
+/// See: https://developer.mozilla.org/en-US/docs/Web/CSS/text-transform
+enum TextCapitalization {
+  /// Uppercase for the first letter of each word.
+  words,
+
+  /// Currently not implemented on Flutter Web. Uppercase for the first letter
+  /// of each sentence.
+  sentences,
+
+  /// Uppercase for each letter.
+  characters,
+
+  /// Lowercase for each letter.
+  none,
+}
+
+/// Helper class for text capitalization.
+///
+/// Uses `autocapitalize` attribute on input element.
+/// See: https://developers.google.com/web/updates/2015/04/autocapitalize
+/// https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/autocapitalize
+class TextCapitalizationConfig {
+  final TextCapitalization textCapitalization;
+
+  const TextCapitalizationConfig.defaultCapitalization()
+      : textCapitalization = TextCapitalization.none;
+
+  TextCapitalizationConfig.fromInputConfiguration(String inputConfiguration)
+      : this.textCapitalization =
+            inputConfiguration == 'TextCapitalization.words'
+                ? TextCapitalization.words
+                : inputConfiguration == 'TextCapitalization.characters'
+                    ? TextCapitalization.characters
+                    : inputConfiguration == 'TextCapitalization.sentences'
+                        ? TextCapitalization.sentences
+                        : TextCapitalization.none;
+
+  /// Sets `autocapitalize` attribute on input elements.
+  ///
+  /// This attribute is only available for mobile browsers.
+  ///
+  /// Note that in mobile browsers the onscreen keyboards provide sentence
+  /// level capitalization as default as apposed to no capitalization on desktop
+  /// browser.
+  ///
+  /// See: https://developers.google.com/web/updates/2015/04/autocapitalize
+  /// https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/autocapitalize
+  void setAutocapitalizeAttribute(html.HtmlElement domElement) {
+    String autocapitalize = '';
+    switch (textCapitalization) {
+      case TextCapitalization.words:
+        // TODO: There is a bug for `words` level capitalization in IOS now.
+        // For now go back to default. Remove the check after bug is resolved.
+        // https://bugs.webkit.org/show_bug.cgi?id=148504
+        if (browserEngine == BrowserEngine.webkit) {
+          autocapitalize = 'sentences';
+        } else {
+          autocapitalize = 'words';
+        }
+        break;
+      case TextCapitalization.characters:
+        autocapitalize = 'characters';
+        break;
+      case TextCapitalization.sentences:
+        autocapitalize = 'sentences';
+        break;
+      case TextCapitalization.none:
+      default:
+        autocapitalize = 'off';
+        break;
+    }
+    if (domElement is html.InputElement) {
+      html.InputElement element = domElement;
+      element.setAttribute('autocapitalize', autocapitalize);
+    } else if (domElement is html.TextAreaElement) {
+      html.TextAreaElement element = domElement;
+      element.setAttribute('autocapitalize', autocapitalize);
+    }
+  }
+}

lib/web_ui/lib/src/engine/text_editing/text_editing.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-
 part of engine;
 
 /// Make the content editable span visible to facilitate debugging.
@@ -115,8 +114,10 @@ class EngineAutofillForm {
     if (fields != null) {
       for (Map<String, dynamic> field in fields.cast<Map<String, dynamic>>()) {
         final Map<String, dynamic> autofillInfo = field['autofill'];
-        final AutofillInfo autofill =
-            AutofillInfo.fromFrameworkMessage(autofillInfo);
+        final AutofillInfo autofill = AutofillInfo.fromFrameworkMessage(
+            autofillInfo,
+            textCapitalization: TextCapitalizationConfig.fromInputConfiguration(
+                field['textCapitalization']));
 
         // The focused text editing element will not be created here.
         final AutofillInfo focusedElement =
@@ -170,16 +171,24 @@ class EngineAutofillForm {
     keys.forEach((String key) {
       final html.Element element = elements![key]!;
       subscriptions.add(element.onInput.listen((html.Event e) {
-        _handleChange(element, key);
+        if (items![key] == null) {
+          throw StateError(
+              'Autofill would not work withuot Autofill value set');
+        } else {
+          final AutofillInfo autofillInfo = items![key] as AutofillInfo;
+          _handleChange(element, autofillInfo);
+        }
       }));
     });
     return subscriptions;
   }
 
-  void _handleChange(html.Element domElement, String? tag) {
-    EditingState newEditingState = EditingState.fromDomElement(domElement as html.HtmlElement?);
+  void _handleChange(html.Element domElement, AutofillInfo autofillInfo) {
+    EditingState newEditingState = EditingState.fromDomElement(
+        domElement as html.HtmlElement?,
+        textCapitalization: autofillInfo.textCapitalization);
 
-    _sendAutofillEditingState(tag, newEditingState);
+    _sendAutofillEditingState(autofillInfo.uniqueIdentifier, newEditingState);
   }
 
   /// Sends the 'TextInputClient.updateEditingStateWithTag' message to the framework.
@@ -207,7 +216,11 @@ class EngineAutofillForm {
 /// These values are to be used when a text field have autofill enabled.
 @visibleForTesting
 class AutofillInfo {
-  AutofillInfo({required this.editingState, required this.uniqueIdentifier, required this.hint});
+  AutofillInfo(
+      {required this.editingState,
+      required this.uniqueIdentifier,
+      required this.hint,
+      required this.textCapitalization});
 
   /// The current text and selection state of a text field.
   final EditingState editingState;
@@ -217,14 +230,29 @@ class AutofillInfo {
   /// Used as id of the text field.
   final String uniqueIdentifier;
 
+  /// Information on how should autofilled text capitalized.
+  ///
+  /// For example for [TextCapitalization.characters] each letter is converted
+  /// to upper case.
+  ///
+  /// This value is not necessary for autofilling the focused element since
+  /// [DefaultTextEditingStrategy._inputConfiguration] already has this
+  /// information.
+  ///
+  /// On the other hand for the multi element forms, for the input elements
+  /// other the focused field, we need to use this information.
+  final TextCapitalizationConfig textCapitalization;
+
   /// Attribute used for autofill.
   ///
   /// Used as a guidance to the browser as to the type of information expected
   /// in the field.
   /// See: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete
   final String hint;
 
-  factory AutofillInfo.fromFrameworkMessage(Map<String, dynamic> autofill) {
+  factory AutofillInfo.fromFrameworkMessage(Map<String, dynamic> autofill,
+      {TextCapitalizationConfig textCapitalization =
+          const TextCapitalizationConfig.defaultCapitalization()}) {
     assert(autofill != null); // ignore: unnecessary_null_comparison
     final String uniqueIdentifier = autofill['uniqueIdentifier']!;
     final List<dynamic> hintsList = autofill['hints'];
@@ -233,7 +261,8 @@ class AutofillInfo {
     return AutofillInfo(
         uniqueIdentifier: uniqueIdentifier,
         hint: BrowserAutofillHints.instance.flutterToEngine(hintsList[0]),
-        editingState: editingState);
+        editingState: editingState,
+        textCapitalization: textCapitalization);
   }
 
   void applyToDomElement(html.HtmlElement domElement,
@@ -302,7 +331,9 @@ class EditingState {
   ///
   /// [domElement] can be a [InputElement] or a [TextAreaElement] depending on
   /// the [InputType] of the text field.
-  factory EditingState.fromDomElement(html.HtmlElement? domElement) {
+  factory EditingState.fromDomElement(html.HtmlElement? domElement,
+      {TextCapitalizationConfig textCapitalization =
+          const TextCapitalizationConfig.defaultCapitalization()}) {
     if (domElement is html.InputElement) {
       html.InputElement element = domElement;
       return EditingState(
@@ -352,10 +383,10 @@ class EditingState {
     if (runtimeType != other.runtimeType) {
       return false;
     }
-    return other is EditingState
-        && other.text == text
-        && other.baseOffset == baseOffset
-        && other.extentOffset == extentOffset;
+    return other is EditingState &&
+        other.text == text &&
+        other.baseOffset == baseOffset &&
+        other.extentOffset == extentOffset;
   }
 
   @override
@@ -396,6 +427,7 @@ class InputConfiguration {
     required this.inputAction,
     required this.obscureText,
     required this.autocorrect,
+    required this.textCapitalization,
     this.autofill,
     this.autofillGroup,
   });
@@ -407,9 +439,12 @@ class InputConfiguration {
         inputAction = flutterInputConfiguration['inputAction'],
         obscureText = flutterInputConfiguration['obscureText'],
         autocorrect = flutterInputConfiguration['autocorrect'],
+        textCapitalization = TextCapitalizationConfig.fromInputConfiguration(
+            flutterInputConfiguration['textCapitalization']),
         autofill = flutterInputConfiguration.containsKey('autofill')
-          ? AutofillInfo.fromFrameworkMessage(flutterInputConfiguration['autofill'])
-          : null,
+            ? AutofillInfo.fromFrameworkMessage(
+                flutterInputConfiguration['autofill'])
+            : null,
         autofillGroup = EngineAutofillForm.fromFrameworkMessage(
             flutterInputConfiguration['autofill'],
             flutterInputConfiguration['fields']);
@@ -435,6 +470,8 @@ class InputConfiguration {
   final AutofillInfo? autofill;
 
   final EngineAutofillForm? autofillGroup;
+
+  final TextCapitalizationConfig textCapitalization;
 }
 
 typedef _OnChangeCallback = void Function(EditingState? editingState);
@@ -500,18 +537,18 @@ class GloballyPositionedTextEditingStrategy extends DefaultTextEditingStrategy {
   void placeElement() {
     super.placeElement();
     if (hasAutofillGroup) {
-       _geometry?.applyToDomElement(focusedFormElement!);
-       placeForm();
-       // On Chrome, when a form is focused, it opens an autofill menu
-       // immeddiately.
-       // Flutter framework sends `setEditableSizeAndTransform` for informing
-       // the engine about the location of the text field. This call will
-       // arrive after `show` call.
-       // Therefore on Chrome we place the element when
-       //  `setEditableSizeAndTransform` method is called and focus on the form
-       // only after placing it to the correct position. Hence autofill menu
-       // does not appear on top-left of the page.
-       focusedFormElement!.focus();
+      _geometry?.applyToDomElement(focusedFormElement!);
+      placeForm();
+      // On Chrome, when a form is focused, it opens an autofill menu
+      // immeddiately.
+      // Flutter framework sends `setEditableSizeAndTransform` for informing
+      // the engine about the location of the text field. This call will
+      // arrive after `show` call.
+      // Therefore on Chrome we place the element when
+      //  `setEditableSizeAndTransform` method is called and focus on the form
+      // only after placing it to the correct position. Hence autofill menu
+      // does not appear on top-left of the page.
+      focusedFormElement!.focus();
     } else {
       _geometry?.applyToDomElement(domElement);
     }
@@ -551,6 +588,7 @@ abstract class DefaultTextEditingStrategy implements TextEditingStrategy {
   set domElement(html.HtmlElement element) {
     _domElement = element;
   }
+
   html.HtmlElement? _domElement;
 
   late InputConfiguration _inputConfiguration;
@@ -694,7 +732,8 @@ abstract class DefaultTextEditingStrategy implements TextEditingStrategy {
   void _handleChange(html.Event event) {
     assert(isEnabled);
 
-    EditingState newEditingState = EditingState.fromDomElement(domElement);
+    EditingState newEditingState = EditingState.fromDomElement(domElement,
+        textCapitalization: _inputConfiguration.textCapitalization);
 
     if (newEditingState != _lastEditingState) {
       _lastEditingState = newEditingState;
@@ -818,6 +857,7 @@ class IOSTextEditingStrategy extends GloballyPositionedTextEditingStrategy {
     } else {
       domRenderer.glassPaneElement!.append(domElement);
     }
+    inputConfig.textCapitalization.setAutocapitalizeAttribute(domElement);
   }
 
   @override
@@ -948,6 +988,7 @@ class AndroidTextEditingStrategy extends GloballyPositionedTextEditingStrategy {
     } else {
       domRenderer.glassPaneElement!.append(domElement);
     }
+    inputConfig.textCapitalization.setAutocapitalizeAttribute(domElement);
   }
 
   @override