Post NSAccessibility notifications for property changes on macOS (#21074)

native/Avalonia.Native/src/OSX/AvnWindow.mm

@@ -656,6 +656,18 @@
 
 - (void)raisePropertyChanged:(AvnAutomationProperty)property
 {
+    switch (property)
+    {
+        case AutomationPeer_Name:
+            NSAccessibilityPostNotification(self, NSAccessibilityTitleChangedNotification);
+            break;
+        case AutomationPeer_BoundingRectangle:
+            NSAccessibilityPostNotification(self, NSAccessibilityMovedNotification);
+            NSAccessibilityPostNotification(self, NSAccessibilityResizedNotification);
+            break;
+        default:
+            break;
+    }
 }
 
 @end

native/Avalonia.Native/src/OSX/automation.mm

@@ -488,8 +488,32 @@
 
 - (void)raisePropertyChanged:(AvnAutomationProperty)property
 {
-    if (property == AutomationPeer_Name && _peer->GetLiveSetting() != LiveSettingOff)
-        [self raiseLiveRegionChanged];
+    switch (property)
+    {
+        case AutomationPeer_Name:
+            NSAccessibilityPostNotification(self, NSAccessibilityTitleChangedNotification);
+            if (_peer->GetLiveSetting() != LiveSettingOff)
+                [self raiseLiveRegionChanged];
+            break;
+        case ValueProvider_Value:
+        case RangeValueProvider_Value:
+            NSAccessibilityPostNotification(self, NSAccessibilityValueChangedNotification);
+            break;
+        case AutomationPeer_BoundingRectangle:
+            NSAccessibilityPostNotification(self, NSAccessibilityMovedNotification);
+            NSAccessibilityPostNotification(self, NSAccessibilityResizedNotification);
+            break;
+        case SelectionItemProvider_IsSelected:
+        case SelectionProvider_Selection:
+            NSAccessibilityPostNotification(self, NSAccessibilitySelectedChildrenChangedNotification);
+            break;
+        case ToggleProvider_ToggleState:
+        case ExpandCollapseProvider_ExpandCollapseState:
+            NSAccessibilityPostNotification(self, NSAccessibilityValueChangedNotification);
+            break;
+        default:
+            break;
+    }
 }
 
 - (void)raiseLiveRegionChanged

src/Avalonia.Native/AvnAutomationPeer.cs

@@ -19,6 +19,11 @@ namespace Avalonia.Native
             { AutomationElementIdentifiers.ClassNameProperty, AvnAutomationProperty.AutomationPeer_ClassName },
             { AutomationElementIdentifiers.NameProperty, AvnAutomationProperty.AutomationPeer_Name },
             { RangeValuePatternIdentifiers.ValueProperty, AvnAutomationProperty.RangeValueProvider_Value },
+            { ValuePatternIdentifiers.ValueProperty, AvnAutomationProperty.ValueProvider_Value },
+            { TogglePatternIdentifiers.ToggleStateProperty, AvnAutomationProperty.ToggleProvider_ToggleState },
+            { ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty, AvnAutomationProperty.ExpandCollapseProvider_ExpandCollapseState },
+            { SelectionItemPatternIdentifiers.IsSelectedProperty, AvnAutomationProperty.SelectionItemProvider_IsSelected },
+            { SelectionPatternIdentifiers.SelectionProperty, AvnAutomationProperty.SelectionProvider_Selection },
         };
 
         private static readonly ConditionalWeakTable<AutomationPeer, AvnAutomationPeer> s_wrappers = new();

src/Avalonia.Native/avn.idl

@@ -403,6 +403,11 @@ enum AvnAutomationProperty
     AutomationPeer_ClassName,
     AutomationPeer_Name,
     RangeValueProvider_Value,
+    ValueProvider_Value,
+    ToggleProvider_ToggleState,
+    ExpandCollapseProvider_ExpandCollapseState,
+    SelectionItemProvider_IsSelected,
+    SelectionProvider_Selection,
 }
 
 struct AvnSize