[web] Librarify semantics files (flutter/engine#27151)

engine/src/flutter/ci/licenses_golden/licenses_flutter

@@ -564,6 +564,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/pointer_binding.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/pointer_converter.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/profiler.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/rrect_renderer.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/semantics.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/semantics/accessibility.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/semantics/checkable.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/semantics/image.dart

engine/src/flutter/lib/web_ui/lib/src/engine.dart

@@ -32,7 +32,6 @@ import 'package:meta/meta.dart';
 
 import '../ui.dart' as ui;
 
-import 'engine/alarm_clock.dart';
 export 'engine/alarm_clock.dart';
 
 export 'engine/assets.dart';
@@ -131,8 +130,30 @@ export 'engine/pointer_converter.dart';
 import 'engine/profiler.dart';
 export 'engine/profiler.dart';
 
-// This import is intentionally commented out because the analyzer says it's unused.
-// import 'engine/services/buffers.dart';
+import 'engine/semantics/accessibility.dart';
+export 'engine/semantics/accessibility.dart';
+
+export 'engine/semantics/checkable.dart';
+
+export 'engine/semantics/image.dart';
+
+export 'engine/semantics/incrementable.dart';
+
+export 'engine/semantics/label_and_value.dart';
+
+export 'engine/semantics/live_region.dart';
+
+export 'engine/semantics/scrollable.dart';
+
+import 'engine/semantics/semantics.dart';
+export 'engine/semantics/semantics.dart';
+
+export 'engine/semantics/semantics_helper.dart';
+
+export 'engine/semantics/tappable.dart';
+
+export 'engine/semantics/text_field.dart';
+
 export 'engine/services/buffers.dart';
 
 import 'engine/services/message_codec.dart';
@@ -302,17 +323,6 @@ part 'engine/platform_views/content_manager.dart';
 part 'engine/platform_views/message_handler.dart';
 part 'engine/platform_views/slots.dart';
 part 'engine/rrect_renderer.dart';
-part 'engine/semantics/accessibility.dart';
-part 'engine/semantics/checkable.dart';
-part 'engine/semantics/image.dart';
-part 'engine/semantics/incrementable.dart';
-part 'engine/semantics/label_and_value.dart';
-part 'engine/semantics/live_region.dart';
-part 'engine/semantics/scrollable.dart';
-part 'engine/semantics/semantics.dart';
-part 'engine/semantics/semantics_helper.dart';
-part 'engine/semantics/tappable.dart';
-part 'engine/semantics/text_field.dart';
 part 'engine/window.dart';
 
 // The mode the app is running in.

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

@@ -207,6 +207,14 @@ bool get isDesktop => _desktopOperatingSystems.contains(operatingSystem);
 /// See [isDesktop].
 bool get isMobile => !isDesktop;
 
+/// Whether the browser is running on macOS or iOS.
+///
+/// - See [operatingSystem].
+/// - See [OperatingSystem].
+bool get isMacOrIOS =>
+    operatingSystem == OperatingSystem.iOs ||
+    operatingSystem == OperatingSystem.macOs;
+
 int? _cachedWebGLVersion;
 
 /// The highest WebGL version supported by the current browser, or -1 if WebGL

engine/src/flutter/lib/web_ui/lib/src/engine/dom_renderer.dart

@@ -387,7 +387,7 @@ class DomRenderer {
 
     // When debugging semantics, make the scene semi-transparent so that the
     // semantics tree is visible.
-    if (_debugShowSemanticsNodes) {
+    if (debugShowSemanticsNodes) {
       _sceneHostElement!.style.opacity = '0.3';
     }
 

engine/src/flutter/lib/web_ui/lib/src/engine/keyboard_binding.dart

@@ -4,11 +4,12 @@
 
 import 'dart:html' as html;
 
-import 'package:ui/src/engine.dart' show EnginePlatformDispatcher, EngineSemanticsOwner, registerHotRestartListener;
+import 'package:ui/src/engine.dart' show EnginePlatformDispatcher, registerHotRestartListener;
 import 'package:ui/ui.dart' as ui;
 
 import 'browser_detection.dart';
 import 'key_map.dart';
+import 'semantics.dart';
 
 typedef _VoidCallback = void Function();
 typedef ValueGetter<T> = T Function();

engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher.dart

@@ -760,6 +760,15 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
     invoke(_onTextScaleFactorChanged, _onTextScaleFactorChangedZone);
   }
 
+  void updateSemanticsEnabled(bool semanticsEnabled) {
+    if (semanticsEnabled != this.semanticsEnabled) {
+      _configuration = _configuration.copyWith(semanticsEnabled: semanticsEnabled);
+      if (_onSemanticsEnabledChanged != null) {
+        invokeOnSemanticsEnabledChanged();
+      }
+    }
+  }
+
   /// The setting indicating the current brightness mode of the host platform.
   /// If the platform has no preference, [platformBrightness] defaults to [Brightness.light].
   ui.Brightness get platformBrightness => configuration.platformBrightness;

engine/src/flutter/lib/web_ui/lib/src/engine/semantics.dart

@@ -0,0 +1,15 @@
+// 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.
+
+export 'semantics/accessibility.dart';
+export 'semantics/checkable.dart';
+export 'semantics/image.dart';
+export 'semantics/incrementable.dart';
+export 'semantics/label_and_value.dart';
+export 'semantics/live_region.dart';
+export 'semantics/scrollable.dart';
+export 'semantics/semantics_helper.dart';
+export 'semantics/semantics.dart';
+export 'semantics/tappable.dart';
+export 'semantics/text_field.dart';

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/accessibility.dart

@@ -2,7 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:async';
+import 'dart:html' as html;
+import 'dart:typed_data';
+
+import 'package:ui/src/engine.dart' show registerHotRestartListener;
+
+import '../services.dart';
 
 /// Singleton for accessing accessibility announcements from the platform.
 final AccessibilityAnnouncements accessibilityAnnouncements =

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/checkable.dart

@@ -11,7 +11,11 @@
 //                framework. Currently the framework does not report the
 //                grouping of radio buttons.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/ui.dart' as ui;
+
+import 'semantics.dart';
 
 /// The specific type of checkable control.
 enum _CheckableKind {

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/image.dart

@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'semantics.dart';
 
 /// Represents semantic objects that deliver information in a visual manner.
 ///

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/incrementable.dart

@@ -2,7 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/src/engine.dart' show EnginePlatformDispatcher;
+import 'package:ui/ui.dart' as ui;
+
+import 'semantics.dart';
 
 /// Adds increment/decrement event handling to a semantics object.
 ///

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/label_and_value.dart

@@ -2,7 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/ui.dart' as ui;
+
+import 'semantics.dart';
 
 /// Renders [_label] and [_value] to the semantics DOM.
 ///
@@ -96,7 +100,7 @@ class LabelAndValue extends RoleManager {
       // Normally use a small font size so that text doesn't leave the scope
       // of the semantics node. When debugging semantics, use a font size
       // that's reasonably visible.
-      _auxiliaryValueElement!.style.fontSize = _debugShowSemanticsNodes ? '12px' : '6px';
+      _auxiliaryValueElement!.style.fontSize = debugShowSemanticsNodes ? '12px' : '6px';
       semanticsObject.element.append(_auxiliaryValueElement!);
     }
     _auxiliaryValueElement!.text = combinedValue.toString();

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/live_region.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'semantics.dart';
 
 /// Manages semantics configurations that represent live regions.
 ///

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/scrollable.dart

@@ -2,7 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/src/engine.dart' show EnginePlatformDispatcher;
+import 'package:ui/ui.dart' as ui;
+
+import 'semantics.dart';
 
 /// Implements vertical and horizontal scrolling functionality for semantics
 /// objects.

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/semantics.dart

@@ -2,7 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+import 'dart:math' as math;
+import 'dart:typed_data';
+
+import 'package:ui/src/engine.dart' show domRenderer, EnginePlatformDispatcher, registerHotRestartListener;
+import 'package:ui/ui.dart' as ui;
+
+import '../alarm_clock.dart';
+import '../browser_detection.dart';
+import '../util.dart';
+import '../vector_math.dart';
+import 'checkable.dart';
+import 'image.dart';
+import 'incrementable.dart';
+import 'label_and_value.dart';
+import 'live_region.dart';
+import 'scrollable.dart';
+import 'semantics_helper.dart';
+import 'tappable.dart';
+import 'text_field.dart';
 
 /// Set this flag to `true` to cause the engine to visualize the semantics tree
 /// on the screen for debugging.
@@ -15,7 +34,7 @@ part of engine;
 /// ```
 /// flutter run -d chrome --profile --dart-define=FLUTTER_WEB_DEBUG_SHOW_SEMANTICS=true
 /// ```
-const bool _debugShowSemanticsNodes = bool.fromEnvironment(
+const bool debugShowSemanticsNodes = bool.fromEnvironment(
   'FLUTTER_WEB_DEBUG_SHOW_SEMANTICS',
   defaultValue: false,
 );
@@ -266,7 +285,7 @@ class SemanticsObject {
     element.style.position = 'absolute';
 
     // The root node has some properties that other nodes do not.
-    if (id == 0 && !_debugShowSemanticsNodes) {
+    if (id == 0 && !debugShowSemanticsNodes) {
       // Make all semantics transparent. We use `filter` instead of `opacity`
       // attribute because `filter` is stronger. `opacity` does not apply to
       // some elements, particularly on iOS, such as the slider thumb and track.
@@ -283,7 +302,7 @@ class SemanticsObject {
     // Make semantic elements visible for debugging by outlining them using a
     // green border. We do not use `border` attribute because it affects layout
     // (`outline` does not).
-    if (_debugShowSemanticsNodes) {
+    if (debugShowSemanticsNodes) {
       element.style.outline = '1px solid green';
     }
   }
@@ -1353,13 +1372,7 @@ class EngineSemanticsOwner {
       _rootSemanticsElement = null;
       _gestureModeClock?.datetime = null;
     }
-    if (_semanticsEnabled != EnginePlatformDispatcher.instance.semanticsEnabled) {
-      EnginePlatformDispatcher.instance._configuration =
-        EnginePlatformDispatcher.instance._configuration.copyWith(semanticsEnabled: _semanticsEnabled);
-      if (EnginePlatformDispatcher.instance._onSemanticsEnabledChanged != null) {
-        EnginePlatformDispatcher.instance.invokeOnSemanticsEnabledChanged();
-      }
-    }
+    EnginePlatformDispatcher.instance.updateSemanticsEnabled(_semanticsEnabled);
   }
 
   /// Controls how pointer events and browser-detected gestures are treated by

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/semantics_helper.dart

@@ -2,7 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:async';
+import 'dart:html' as html;
+
+import 'package:meta/meta.dart';
+
+import '../browser_detection.dart';
+import 'semantics.dart';
 
 /// The maximum [semanticsActivationAttempts] before we give up waiting for
 /// the user to enable semantics.

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/tappable.dart

@@ -2,7 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/src/engine.dart' show EnginePlatformDispatcher;
+import 'package:ui/ui.dart' as ui;
+
+import 'semantics.dart';
 
 /// Listens to HTML "click" gestures detected by the browser.
 ///

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/text_field.dart

@@ -2,7 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:html' as html;
+
+import 'package:ui/src/engine.dart' show EnginePlatformDispatcher;
+import 'package:ui/ui.dart' as ui;
+
+import '../text_editing/text_editing.dart';
+import '../browser_detection.dart';
+import 'semantics.dart';
 
 /// Text editing used by accesibility mode.
 ///

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

@@ -8,11 +8,12 @@ import 'dart:math' as math;
 import 'dart:typed_data';
 
 import 'package:meta/meta.dart';
-import 'package:ui/src/engine.dart' show domRenderer, EnginePlatformDispatcher, EngineSemanticsOwner, SemanticsTextEditingStrategy;
+import 'package:ui/src/engine.dart' show domRenderer, EnginePlatformDispatcher;
 import 'package:ui/ui.dart' as ui;
 
 import '../browser_detection.dart';
 import '../host_node.dart';
+import '../semantics.dart';
 import '../services.dart';
 import '../text/paragraph.dart';
 import '../util.dart';

engine/src/flutter/lib/web_ui/lib/src/engine/util.dart

@@ -425,10 +425,6 @@ const Set<String> _genericFontFamilies = <String>{
 final String _fallbackFontFamily =
     isMacOrIOS ? '-apple-system, BlinkMacSystemFont' : 'Arial';
 
-bool get isMacOrIOS =>
-    operatingSystem == OperatingSystem.iOs ||
-    operatingSystem == OperatingSystem.macOs;
-
 /// Create a font-family string appropriate for CSS.
 ///
 /// If the given [fontFamily] is a generic font-family, then just return it.

engine/src/flutter/lib/web_ui/test/engine/semantics/accessibility_test.dart

@@ -7,7 +7,8 @@ import 'dart:html';
 
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
-import 'package:ui/src/engine.dart';
+import 'package:ui/src/engine/semantics.dart';
+import 'package:ui/src/engine/services.dart';
 
 const StandardMessageCodec codec = StandardMessageCodec();
 const String testMessage = 'This is an tooltip.';

engine/src/flutter/lib/web_ui/test/engine/semantics/semantics_helper_test.dart

@@ -6,7 +6,9 @@ import 'dart:html' as html;
 
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
-import 'package:ui/src/engine.dart';
+import 'package:ui/src/engine/browser_detection.dart';
+import 'package:ui/src/engine/pointer_binding.dart';
+import 'package:ui/src/engine/semantics.dart';
 
 const PointerSupportDetector _defaultSupportDetector = PointerSupportDetector();
 

engine/src/flutter/lib/web_ui/test/engine/semantics/semantics_test.dart

@@ -12,7 +12,10 @@ import 'package:quiver/testing/async.dart';
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 
-import 'package:ui/src/engine.dart';
+import 'package:ui/src/engine.dart' show domRenderer;
+import 'package:ui/src/engine/browser_detection.dart';
+import 'package:ui/src/engine/semantics.dart';
+import 'package:ui/src/engine/vector_math.dart';
 import 'package:ui/ui.dart' as ui;
 
 import 'semantics_tester.dart';

engine/src/flutter/lib/web_ui/test/engine/semantics/semantics_tester.dart

@@ -7,7 +7,12 @@ import 'dart:html' as html;
 import 'dart:typed_data';
 
 import 'package:test/test.dart';
-import 'package:ui/src/engine.dart';
+import 'package:ui/src/engine.dart' show domRenderer, toMatrix32;
+import 'package:ui/src/engine/browser_detection.dart';
+import 'package:ui/src/engine/host_node.dart';
+import 'package:ui/src/engine/semantics.dart';
+import 'package:ui/src/engine/util.dart';
+import 'package:ui/src/engine/vector_math.dart';
 import 'package:ui/ui.dart' as ui;
 
 import '../../matchers.dart';