Move semantics stuff from rendering to a top-level semantics/ library (#12793)

packages/flutter/lib/rendering.dart

@@ -28,6 +28,7 @@ export 'package:flutter/foundation.dart' show
   ValueGetter,
   ValueSetter,
   DiagnosticLevel;
+export 'package:flutter/semantics.dart';
 export 'package:vector_math/vector_math_64.dart' show Matrix4;
 
 export 'src/rendering/animated_size.dart';
@@ -47,7 +48,6 @@ export 'src/rendering/paragraph.dart';
 export 'src/rendering/performance_overlay.dart';
 export 'src/rendering/proxy_box.dart';
 export 'src/rendering/rotated_box.dart';
-export 'src/rendering/semantics.dart';
 export 'src/rendering/shifted_box.dart';
 export 'src/rendering/sliver.dart';
 export 'src/rendering/sliver_fill.dart';

packages/flutter/lib/semantics.dart

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// The Flutter semantics package.
+///
+/// To use, import `package:flutter/semantics.dart`.
+///
+/// The [SemanticsEvent] classes define the protocol for sending semantic events
+/// to the platform.
+///
+/// The [SemanticsNode] hierarchy represents the semantic structure of the UI
+/// and is used to by the platform-specific accessibility services.
+library semantics;
+
+export 'src/semantics/semantics.dart';

packages/flutter/lib/src/painting/matrix_utils.dart

@@ -5,6 +5,7 @@
 import 'dart:math' as math;
 import 'dart:typed_data';
 
+import 'package:flutter/foundation.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'basic_types.dart';
@@ -169,3 +170,51 @@ class MatrixUtils {
     return transformRect(transform, rect);
   }
 }
+
+/// Returns a list of strings representing the given transform in a format
+/// useful for [TransformProperty].
+///
+/// If the argument is null, returns a list with the single string "null".
+List<String> debugDescribeTransform(Matrix4 transform) {
+  if (transform == null)
+    return const <String>['null'];
+  final List<String> matrix = transform.toString().split('\n').map((String s) => '  $s').toList();
+  matrix.removeLast();
+  return matrix;
+}
+
+/// Property which handles [Matrix4] that represent transforms.
+class TransformProperty extends DiagnosticsProperty<Matrix4> {
+  /// Create a diagnostics property for [Matrix4] objects.
+  ///
+  /// The [showName] and [level] arguments must not be null.
+  TransformProperty(String name, Matrix4 value, {
+    bool showName: true,
+    Object defaultValue: kNoDefaultValue,
+    DiagnosticLevel level: DiagnosticLevel.info,
+  }) : assert(showName != null),
+       assert(level != null),
+       super(
+         name,
+         value,
+         showName: showName,
+         defaultValue: defaultValue,
+         level: level,
+       );
+
+  @override
+  String valueToString({ TextTreeConfiguration parentConfiguration }) {
+    if (parentConfiguration != null && !parentConfiguration.lineBreakProperties) {
+      // Format the value on a single line to be compatible with the parent's
+      // style.
+      final List<Vector4> rows = <Vector4>[
+        value.getRow(0),
+        value.getRow(1),
+        value.getRow(2),
+        value.getRow(3),
+      ];
+      return '[${rows.join("; ")}]';
+    }
+    return debugDescribeTransform(value).join('\n');
+  }
+}

packages/flutter/lib/src/rendering/binding.dart

@@ -9,12 +9,12 @@ import 'dart:ui' as ui show window;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter/services.dart';
 
 import 'box.dart';
 import 'debug.dart';
 import 'object.dart';
-import 'semantics.dart';
 import 'view.dart';
 
 export 'package:flutter/gestures.dart' show HitTestResult;

packages/flutter/lib/src/rendering/debug.dart

@@ -4,30 +4,12 @@
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
-import 'package:vector_math/vector_math_64.dart';
 
 export 'package:flutter/foundation.dart' show debugPrint;
 
 // Any changes to this file should be reflected in the debugAssertAllRenderVarsUnset()
 // function below.
 
-/// Used by [debugDumpSemanticsTree] to specify the order in which child nodes
-/// are printed.
-enum DebugSemanticsDumpOrder {
-  /// Print nodes in inverse hit test order.
-  ///
-  /// In inverse hit test order, the last child of a [SemanticsNode] will be
-  /// asked first if it wants to respond to a user's interaction, followed by
-  /// the second last, etc. until a taker is found.
-  inverseHitTest,
-
-  /// Print nodes in traversal order.
-  ///
-  /// Traversal order defines how the user can move the accessibility focus from
-  /// one node to another.
-  traversal,
-}
-
 const HSVColor _kDebugDefaultRepaintColor = const HSVColor.fromAHSV(0.4, 60.0, 1.0, 1.0);
 
 /// Causes each RenderBox to paint a box around its bounds, and some extra
@@ -130,54 +112,6 @@ bool debugCheckIntrinsicSizes = false;
 bool debugProfilePaintsEnabled = false;
 
 
-/// Returns a list of strings representing the given transform in a format
-/// useful for [TransformProperty].
-///
-/// If the argument is null, returns a list with the single string "null".
-List<String> debugDescribeTransform(Matrix4 transform) {
-  if (transform == null)
-    return const <String>['null'];
-  final List<String> matrix = transform.toString().split('\n').map((String s) => '  $s').toList();
-  matrix.removeLast();
-  return matrix;
-}
-
-/// Property which handles [Matrix4] that represent transforms.
-class TransformProperty extends DiagnosticsProperty<Matrix4> {
-  /// Create a diagnostics property for [Matrix4] objects.
-  ///
-  /// The [showName] and [level] arguments must not be null.
-  TransformProperty(String name, Matrix4 value, {
-    bool showName: true,
-    Object defaultValue: kNoDefaultValue,
-    DiagnosticLevel level: DiagnosticLevel.info,
-  }) : assert(showName != null),
-       assert(level != null),
-       super(
-         name,
-         value,
-         showName: showName,
-         defaultValue: defaultValue,
-         level: level,
-       );
-
-  @override
-  String valueToString({ TextTreeConfiguration parentConfiguration }) {
-    if (parentConfiguration != null && !parentConfiguration.lineBreakProperties) {
-      // Format the value on a single line to be compatible with the parent's
-      // style.
-      final List<Vector4> rows = <Vector4>[
-        value.getRow(0),
-        value.getRow(1),
-        value.getRow(2),
-        value.getRow(3),
-      ];
-      return '[${rows.join("; ")}]';
-    }
-    return debugDescribeTransform(value).join('\n');
-  }
-}
-
 void _debugDrawDoubleRect(Canvas canvas, Rect outerRect, Rect innerRect, Color color) {
   final Path path = new Path()
     ..fillType = PathFillType.evenOdd

packages/flutter/lib/src/rendering/editable.dart

@@ -7,11 +7,11 @@ import 'dart:ui' as ui show TextBox;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter/services.dart';
 
 import 'box.dart';
 import 'object.dart';
-import 'semantics.dart';
 import 'viewport_offset.dart';
 
 const double _kCaretGap = 1.0; // pixels

packages/flutter/lib/src/rendering/layer.dart

@@ -10,8 +10,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
 import 'package:vector_math/vector_math_64.dart';
 
-import 'debug.dart';
-
 /// A composited layer.
 ///
 /// During painting, the render tree generates a tree of composited layers that

packages/flutter/lib/src/rendering/object.dart

@@ -9,12 +9,12 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:flutter/semantics.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';
 import 'debug.dart';
 import 'layer.dart';
-import 'semantics.dart';
 
 export 'package:flutter/foundation.dart' show FlutterError, InformationCollector, DiagnosticsNode, DiagnosticsProperty, StringProperty, DoubleProperty, EnumProperty, FlagProperty, IntProperty, DiagnosticPropertiesBuilder;
 export 'package:flutter/gestures.dart' show HitTestEntry, HitTestResult;

packages/flutter/lib/src/rendering/paragraph.dart

@@ -6,13 +6,13 @@ import 'dart:ui' as ui show Gradient, Shader, TextBox;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter/services.dart';
 
 
 import 'box.dart';
 import 'debug.dart';
 import 'object.dart';
-import 'semantics.dart';
 
 /// How overflowing text should be handled.
 enum TextOverflow {

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -7,15 +7,14 @@ import 'dart:ui' as ui show ImageFilter, Gradient;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/painting.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter/services.dart';
 
 import 'package:vector_math/vector_math_64.dart';
 
 import 'box.dart';
-import 'debug.dart';
 import 'layer.dart';
 import 'object.dart';
-import 'semantics.dart';
 
 export 'package:flutter/gestures.dart' show
   PointerEvent,

packages/flutter/lib/src/rendering/sliver_persistent_header.dart

@@ -8,13 +8,13 @@ import 'package:flutter/animation.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:flutter/semantics.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';
 import 'box.dart';
 import 'object.dart';
 import 'proxy_box.dart';
-import 'semantics.dart';
 import 'sliver.dart';
 import 'viewport_offset.dart';
 

packages/flutter/lib/src/rendering/viewport.dart

@@ -6,13 +6,13 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
+import 'package:flutter/semantics.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';
 import 'box.dart';
 import 'object.dart';
 import 'proxy_box.dart';
-import 'semantics.dart';
 import 'sliver.dart';
 import 'viewport_offset.dart';
 

packages/flutter/lib/src/rendering/semantics.dart → packages/flutter/lib/src/semantics/semantics.dart

@@ -4,14 +4,15 @@
 
 import 'dart:typed_data';
 import 'dart:ui' as ui;
-import 'dart:ui' show Rect, SemanticsAction, SemanticsFlags;
+import 'dart:ui' show Offset, Rect, SemanticsAction, SemanticsFlags,
+       TextDirection;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/painting.dart';
+import 'package:flutter/painting.dart' show MatrixUtils, TransformProperty;
 import 'package:flutter/services.dart';
 import 'package:vector_math/vector_math_64.dart';
 
-import 'debug.dart';
+
 import 'semantics_event.dart';
 
 export 'dart:ui' show SemanticsAction;
@@ -197,7 +198,7 @@ class SemanticsData extends Diagnosticable {
   }
 
   @override
-  int get hashCode => hashValues(flags, actions, label, textDirection, rect, tags, transform);
+  int get hashCode => ui.hashValues(flags, actions, label, textDirection, rect, tags, transform);
 }
 
 class _SemanticsDiagnosticableNode extends DiagnosticableNode<SemanticsNode> {
@@ -1376,6 +1377,23 @@ class SemanticsConfiguration {
   }
 }
 
+/// Used by [debugDumpSemanticsTree] to specify the order in which child nodes
+/// are printed.
+enum DebugSemanticsDumpOrder {
+  /// Print nodes in inverse hit test order.
+  ///
+  /// In inverse hit test order, the last child of a [SemanticsNode] will be
+  /// asked first if it wants to respond to a user's interaction, followed by
+  /// the second last, etc. until a taker is found.
+  inverseHitTest,
+
+  /// Print nodes in traversal order.
+  ///
+  /// Traversal order defines how the user can move the accessibility focus from
+  /// one node to another.
+  traversal,
+}
+
 String _concatStrings({
   @required String thisString,
   @required String otherString,

packages/flutter/test/rendering/semantics_test.dart → packages/flutter/test/semantics/semantics_test.dart

@@ -3,10 +3,11 @@
 // found in the LICENSE file.
 
 import 'package:flutter/rendering.dart';
+import 'package:flutter/semantics.dart';
 import 'package:test/test.dart';
 import 'package:vector_math/vector_math_64.dart';
 
-import 'rendering_tester.dart';
+import '../rendering/rendering_tester.dart';
 
 
 void main() {

packages/flutter/test/widgets/semantics_event_test.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.
 
-import 'package:flutter/rendering.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {

packages/flutter/test/widgets/semantics_test.dart

@@ -4,6 +4,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';