add read only semantics flag (#34683)

bin/internal/engine.version

-20d3861ac8e1f8f38c8659b16b699d0e63db01b1
+54f88ab5da4d0f3cff5337ab263dbf3385ee78df

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

@@ -832,6 +832,9 @@ class RenderCustomPaint extends RenderProxyBox {
     if (properties.textField != null) {
       config.isTextField = properties.textField;
     }
+    if (properties.readOnly != null) {
+      config.isReadOnly = properties.readOnly;
+    }
     if (properties.focused != null) {
       config.isFocused = properties.focused;
     }

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

@@ -3426,6 +3426,7 @@ class RenderSemanticsAnnotations extends RenderProxyBox {
     bool button,
     bool header,
     bool textField,
+    bool readOnly,
     bool focused,
     bool inMutuallyExclusiveGroup,
     bool obscured,
@@ -3473,6 +3474,7 @@ class RenderSemanticsAnnotations extends RenderProxyBox {
        _button = button,
        _header = header,
        _textField = textField,
+       _readOnly = readOnly,
        _focused = focused,
        _inMutuallyExclusiveGroup = inMutuallyExclusiveGroup,
        _obscured = obscured,
@@ -3629,6 +3631,16 @@ class RenderSemanticsAnnotations extends RenderProxyBox {
     markNeedsSemanticsUpdate();
   }
 
+  /// If non-null, sets the [SemanticsNode.isReadOnly] semantic to the given value.
+  bool get readOnly => _readOnly;
+  bool _readOnly;
+  set readOnly(bool value) {
+    if (readOnly == value)
+      return;
+    _readOnly = value;
+    markNeedsSemanticsUpdate();
+  }
+
   /// If non-null, sets the [SemanticsNode.isFocused] semantic to the given value.
   bool get focused => _focused;
   bool _focused;
@@ -4252,6 +4264,8 @@ class RenderSemanticsAnnotations extends RenderProxyBox {
       config.isHeader = header;
     if (textField != null)
       config.isTextField = textField;
+    if (readOnly != null)
+      config.isReadOnly = readOnly;
     if (focused != null)
       config.isFocused = focused;
     if (inMutuallyExclusiveGroup != null)

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

@@ -565,6 +565,7 @@ class SemanticsProperties extends DiagnosticableTree {
     this.button,
     this.header,
     this.textField,
+    this.readOnly,
     this.focused,
     this.inMutuallyExclusiveGroup,
     this.hidden,
@@ -651,6 +652,13 @@ class SemanticsProperties extends DiagnosticableTree {
   /// text field.
   final bool textField;
 
+  /// If non-null, indicates that this subtree is read only.
+  ///
+  /// Only applicable when [textField] is true
+  ///
+  /// TalkBack/VoiceOver will treat it as non-editable text field.
+  final bool readOnly;
+
   /// If non-null, whether the node currently holds input focus.
   ///
   /// At most one node in the tree should hold input focus at any point in time.
@@ -3506,6 +3514,14 @@ class SemanticsConfiguration {
     _setFlag(SemanticsFlag.isTextField, value);
   }
 
+  /// Whether the owning [RenderObject] is read only.
+  ///
+  /// Only applicable when [isTextField] is true.
+  bool get isReadOnly => _hasFlag(SemanticsFlag.isReadOnly);
+  set isReadOnly(bool value) {
+    _setFlag(SemanticsFlag.isReadOnly, value);
+  }
+
   /// Whether the [value] should be obscured.
   ///
   /// This option is usually set in combination with [textField] to indicate

packages/flutter/lib/src/widgets/basic.dart

@@ -5919,6 +5919,7 @@ class Semantics extends SingleChildRenderObjectWidget {
     bool button,
     bool header,
     bool textField,
+    bool readOnly,
     bool focused,
     bool inMutuallyExclusiveGroup,
     bool obscured,
@@ -5968,6 +5969,7 @@ class Semantics extends SingleChildRenderObjectWidget {
       button: button,
       header: header,
       textField: textField,
+      readOnly: readOnly,
       focused: focused,
       inMutuallyExclusiveGroup: inMutuallyExclusiveGroup,
       obscured: obscured,
@@ -6076,6 +6078,7 @@ class Semantics extends SingleChildRenderObjectWidget {
       button: properties.button,
       header: properties.header,
       textField: properties.textField,
+      readOnly: properties.readOnly,
       focused: properties.focused,
       liveRegion: properties.liveRegion,
       inMutuallyExclusiveGroup: properties.inMutuallyExclusiveGroup,
@@ -6141,6 +6144,7 @@ class Semantics extends SingleChildRenderObjectWidget {
       ..button = properties.button
       ..header = properties.header
       ..textField = properties.textField
+      ..readOnly = properties.readOnly
       ..focused = properties.focused
       ..inMutuallyExclusiveGroup = properties.inMutuallyExclusiveGroup
       ..obscured = properties.obscured

packages/flutter/test/widgets/custom_painter_test.dart

@@ -412,6 +412,7 @@ void _defineTests() {
             hidden: true,
             button: true,
             textField: true,
+            readOnly: true,
             focused: true,
             inMutuallyExclusiveGroup: true,
             header: true,
@@ -458,6 +459,7 @@ void _defineTests() {
             hidden: true,
             button: true,
             textField: true,
+            readOnly: true,
             focused: true,
             inMutuallyExclusiveGroup: true,
             header: true,

packages/flutter/test/widgets/semantics_test.dart

@@ -474,6 +474,7 @@ void main() {
           selected: true,
           button: true,
           textField: true,
+          readOnly: true,
           focused: true,
           inMutuallyExclusiveGroup: true,
           header: true,

packages/flutter_test/lib/src/matchers.dart

@@ -413,6 +413,7 @@ Matcher matchesSemantics({
   bool isButton = false,
   bool isFocused = false,
   bool isTextField = false,
+  bool isReadOnly = false,
   bool hasEnabledState = false,
   bool isEnabled = false,
   bool isInMutuallyExclusiveGroup = false,
@@ -464,6 +465,8 @@ Matcher matchesSemantics({
     flags.add(SemanticsFlag.isButton);
   if (isTextField)
     flags.add(SemanticsFlag.isTextField);
+  if (isReadOnly)
+    flags.add(SemanticsFlag.isReadOnly);
   if (isFocused)
     flags.add(SemanticsFlag.isFocused);
   if (hasEnabledState)

packages/flutter_test/test/matchers_test.dart

@@ -597,6 +597,7 @@ void main() {
          isSelected: true,
          isButton: true,
          isTextField: true,
+         isReadOnly: true,
          hasEnabledState: true,
          isFocused: true,
          isEnabled: true,