Support keyboard types on mobile browsers (#13044)

Author: mdebbar

ci/licenses_golden/licenses_flutter

@@ -426,7 +426,8 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/text/ruler.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/text/unicode_range.dart
 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.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_editing.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/util.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/validators.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/vector_math.dart

lib/web_ui/lib/src/engine.dart

@@ -93,7 +93,8 @@ part 'engine/text/ruler.dart';
 part 'engine/text/unicode_range.dart';
 part 'engine/text/word_break_properties.dart';
 part 'engine/text/word_breaker.dart';
-part 'engine/text_editing.dart';
+part 'engine/text_editing/input_type.dart';
+part 'engine/text_editing/text_editing.dart';
 part 'engine/util.dart';
 part 'engine/validators.dart';
 part 'engine/vector_math.dart';

lib/web_ui/lib/src/engine/browser_detection.dart

@@ -77,19 +77,35 @@ OperatingSystem _operatingSystem;
 ///
 /// This is used to implement operating system specific behavior such as
 /// soft keyboards.
-OperatingSystem get operatingSystem =>
-    _operatingSystem ??= _detectOperatingSystem();
+OperatingSystem get operatingSystem {
+  if (debugOperatingSystemOverride != null) {
+    return debugOperatingSystemOverride;
+  }
+  return _operatingSystem ??= _detectOperatingSystem();
+}
+
+/// Override the value of [operatingSystem].
+///
+/// Setting this to `null` lets [operatingSystem] detect the real OS that the
+/// app is running on.
+///
+/// This is intended to be used for testing and debugging only.
+OperatingSystem debugOperatingSystemOverride;
 
 OperatingSystem _detectOperatingSystem() {
   final String platform = html.window.navigator.platform;
+  final String userAgent = html.window.navigator.userAgent;
 
   if (platform.startsWith('Mac')) {
     return OperatingSystem.macOs;
   } else if (platform.toLowerCase().contains('iphone') ||
       platform.toLowerCase().contains('ipad') ||
       platform.toLowerCase().contains('ipod')) {
     return OperatingSystem.iOs;
-  } else if (platform.toLowerCase().contains('android')) {
+  } else if (userAgent.contains('Android')) {
+    // The Android OS reports itself as "Linux armv8l" in
+    // [html.window.navigator.platform]. So we have to check the user-agent to
+    // determine if the OS is Android or not.
     return OperatingSystem.android;
   } else if (platform.startsWith('Linux')) {
     return OperatingSystem.linux;

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

@@ -0,0 +1,129 @@
+// 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;
+
+/// Various types of inputs used in text fields.
+///
+/// These types are coming from Flutter's [TextInputType]. Currently, we don't
+/// support all the types. We fallback to [EngineInputType.text] when Flutter
+/// sends a type that isn't supported.
+// TODO(flutter_web): Support more types.
+abstract class EngineInputType {
+  const EngineInputType();
+
+  static EngineInputType fromName(String name) {
+    switch (name) {
+      case 'TextInputType.number':
+        return number;
+      case 'TextInputType.phone':
+        return phone;
+      case 'TextInputType.emailAddress':
+        return emailAddress;
+      case 'TextInputType.url':
+        return url;
+      case 'TextInputType.multiline':
+        return multiline;
+
+      case 'TextInputType.text':
+      default:
+        return text;
+    }
+  }
+
+  /// Single-line text input type.
+  static const TextInputType text = TextInputType();
+
+  /// Numeric input type.
+  static const NumberInputType number = NumberInputType();
+
+  /// Phone number input type.
+  static const PhoneInputType phone = PhoneInputType();
+
+  /// Email address input type.
+  static const EmailInputType emailAddress = EmailInputType();
+
+  /// URL input type.
+  static const UrlInputType url = UrlInputType();
+
+  /// Multi-line text input type.
+  static const MultilineInputType multiline = MultilineInputType();
+
+  /// The HTML `inputmode` attribute to be set on the DOM element.
+  ///
+  /// This HTML attribute helps the browser decide what kind of keyboard works
+  /// best for this text field.
+  ///
+  /// For various `inputmode` values supported by browsers, see:
+  /// <https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inputmode>.
+  String get inputmodeAttribute;
+
+  /// Create the appropriate DOM element for this input type.
+  html.HtmlElement createDomElement() => html.InputElement();
+
+  /// Given a [domElement], set attributes that are specific to this input type.
+  void configureDomElement(html.HtmlElement domElement) {
+    if (inputmodeAttribute == null) {
+      return;
+    }
+
+    // Only apply `inputmode` in mobile browsers so that the right virtual
+    // keyboard shows up.
+    if (operatingSystem == OperatingSystem.iOs ||
+        operatingSystem == OperatingSystem.android) {
+      domElement.setAttribute('inputmode', inputmodeAttribute);
+    }
+  }
+}
+
+/// Single-line text input type.
+class TextInputType extends EngineInputType {
+  const TextInputType();
+
+  @override
+  final String inputmodeAttribute = 'text';
+}
+
+/// Numeric input type.
+class NumberInputType extends EngineInputType {
+  const NumberInputType();
+
+  @override
+  final String inputmodeAttribute = 'numeric';
+}
+
+/// Phone number input type.
+class PhoneInputType extends EngineInputType {
+  const PhoneInputType();
+
+  @override
+  final String inputmodeAttribute = 'tel';
+}
+
+/// Email address input type.
+class EmailInputType extends EngineInputType {
+  const EmailInputType();
+
+  @override
+  final String inputmodeAttribute = 'email';
+}
+
+/// URL input type.
+class UrlInputType extends EngineInputType {
+  const UrlInputType();
+
+  @override
+  final String inputmodeAttribute = 'url';
+}
+
+/// Multi-line text input type.
+class MultilineInputType extends EngineInputType {
+  const MultilineInputType();
+
+  @override
+  final String inputmodeAttribute = null;
+
+  @override
+  html.HtmlElement createDomElement() => html.TextAreaElement();
+}

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

@@ -163,31 +163,6 @@ class EditingState {
   }
 }
 
-/// Various types of inputs used in text fields.
-///
-/// These types are coming from Flutter's [TextInputType]. Currently, we don't
-/// support all the types. We fallback to [InputType.text] when Flutter sends
-/// a type that isn't supported.
-// TODO(flutter_web): Support more types.
-enum InputType {
-  /// Single-line plain text.
-  text,
-
-  /// Multi-line text.
-  multiline,
-}
-
-InputType _getInputTypeFromString(String inputType) {
-  switch (inputType) {
-    case 'TextInputType.multiline':
-      return InputType.multiline;
-
-    case 'TextInputType.text':
-    default:
-      return InputType.text;
-  }
-}
-
 /// Controls the appearance of the input control being edited.
 ///
 /// For example, [inputType] determines whether we should use `<input>` or
@@ -201,12 +176,12 @@ class InputConfiguration {
   });
 
   InputConfiguration.fromFlutter(Map<String, dynamic> flutterInputConfiguration)
-      : inputType = _getInputTypeFromString(
+      : inputType = EngineInputType.fromName(
             flutterInputConfiguration['inputType']['name']),
         obscureText = flutterInputConfiguration['obscureText'];
 
   /// The type of information being edited in the input control.
-  final InputType inputType;
+  final EngineInputType inputType;
 
   /// Whether to hide the text being edited.
   final bool obscureText;
@@ -341,6 +316,7 @@ class TextEditingElement {
       _subscriptions.add(domElement.onKeyUp.listen((event) {
         _handleChange(event);
       }));
+
       /// In Firefox the context menu item "Select All" does not work without
       /// listening to onSelect. On the other browsers onSelectionChange is
       /// enough for covering "Select All" functionality.
@@ -370,19 +346,10 @@ class TextEditingElement {
   }
 
   void _initDomElement(InputConfiguration inputConfig) {
-    switch (inputConfig.inputType) {
-      case InputType.text:
-        domElement = owner.createInputElement();
-        break;
-
-      case InputType.multiline:
-        domElement = owner.createTextAreaElement();
-        break;
-
-      default:
-        throw UnsupportedError(
-            'Unsupported input type: ${inputConfig.inputType}');
-    }
+    domElement = inputConfig.inputType.createDomElement();
+    inputConfig.inputType.configureDomElement(domElement);
+    _setStaticStyleAttributes(domElement);
+    owner._setDynamicStyleAttributes(domElement);
     domRenderer.glassPaneElement.append(domElement);
   }
 
@@ -757,20 +724,6 @@ class HybridTextEditing {
   void setStyleOutsideOfScreen(html.HtmlElement domElement) {
     domElement.style.transform = 'translate(-9999px, -9999px)';
   }
-
-  html.InputElement createInputElement() {
-    final html.InputElement input = html.InputElement();
-    _setStaticStyleAttributes(input);
-    _setDynamicStyleAttributes(input);
-    return input;
-  }
-
-  html.TextAreaElement createTextAreaElement() {
-    final html.TextAreaElement textarea = html.TextAreaElement();
-    _setStaticStyleAttributes(textarea);
-    _setDynamicStyleAttributes(textarea);
-    return textarea;
-  }
 }
 
 /// Information on the font and alignment of a text editing element.