From 264612785157ac54b7e7fb65de33fd0ebbd03440 Mon Sep 17 00:00:00 2001
From: Jumar Macato <16554748+jmacato@users.noreply.github.com>
Date: Wed, 17 Jun 2026 02:03:31 +0800
Subject: [PATCH] Report read-only value state to macOS accessibility (#21597)

AvnAccessibilityElement answers accessibilityIsAttributeSettable for the value attribute using IValueProvider.IsReadOnly, so AX clients see a read-only TextBox as not settable.
---
 native/Avalonia.Native/src/OSX/automation.mm | 14 ++++++++++++++
 src/Avalonia.Native/AvnAutomationPeer.cs     |  1 +
 src/Avalonia.Native/avn.idl                  |  1 +
 3 files changed, 16 insertions(+)

diff --git a/native/Avalonia.Native/src/OSX/automation.mm b/native/Avalonia.Native/src/OSX/automation.mm
index a6ae754c43..7897a76973 100644
--- a/native/Avalonia.Native/src/OSX/automation.mm
+++ b/native/Avalonia.Native/src/OSX/automation.mm
@@ -274,6 +274,20 @@
     }
 }
 
+- (BOOL)accessibilityIsAttributeSettable:(NSAccessibilityAttributeName)attribute
+{
+    if ([attribute isEqualToString:NSAccessibilityValueAttribute])
+    {
+        if (_peer->IsValueProvider())
+            return !_peer->ValueProvider_IsReadOnly();
+        if (_peer->IsRangeValueProvider())
+            return YES;
+        return NO;
+    }
+
+    return [super accessibilityIsAttributeSettable:attribute];
+}
+
 - (id)accessibilityMinValue
 {
     if (_peer->IsRangeValueProvider())
diff --git a/src/Avalonia.Native/AvnAutomationPeer.cs b/src/Avalonia.Native/AvnAutomationPeer.cs
index 659ba78200..4a679e3ed7 100644
--- a/src/Avalonia.Native/AvnAutomationPeer.cs
+++ b/src/Avalonia.Native/AvnAutomationPeer.cs
@@ -201,6 +201,7 @@ namespace Avalonia.Native
         public int IsValueProvider() => IsProvider<IValueProvider>();
         public IAvnString? ValueProvider_GetValue() => ValueProvider.Value.ToAvnString();
         public void ValueProvider_SetValue(string value) => ValueProvider.SetValue(value);
+        public int ValueProvider_IsReadOnly() => ValueProvider.IsReadOnly.AsComBool();
 
         [return: NotNullIfNotNull("peer")]
         public static AvnAutomationPeer? Wrap(AutomationPeer? peer)
diff --git a/src/Avalonia.Native/avn.idl b/src/Avalonia.Native/avn.idl
index 1b9ee376c6..a1b57f7d14 100644
--- a/src/Avalonia.Native/avn.idl
+++ b/src/Avalonia.Native/avn.idl
@@ -1329,6 +1329,7 @@ interface IAvnAutomationPeer : IUnknown
      bool IsValueProvider();
      IAvnString* ValueProvider_GetValue();
      void ValueProvider_SetValue([const] char* value);
+     bool ValueProvider_IsReadOnly();
 
      IAvnString* GetHelpText();
      IAvnString* GetPlaceholderText();