Merge pull request #3224 from M-Lipin/Issue_3223_ListView_UIA_Accessi…

…bility

src/System.Windows.Forms.Primitives/src/Interop/UiaCore/Interop.IMultipleViewProvider.cs

@@ -0,0 +1,25 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class UiaCore
+    {
+        [ComImport]
+        [Guid("6278cab1-b556-4a1a-b4e0-418acc523201")]
+        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+        public interface IMultipleViewProvider
+        {
+            string? GetViewName(int viewId);
+
+            void SetCurrentView(int viewId);
+
+            int CurrentView { get; }
+
+            int[]? GetSupportedViews();
+        }
+    }
+}

src/System.Windows.Forms/src/Resources/SR.resx

@@ -6722,4 +6722,7 @@ Stack trace where the illegal operation occurred was:
   <data name="TextFormatFlagsModifyStringNotAllowed" xml:space="preserve">
     <value>TextFormatFlags.ModifyString is not allowed.</value>
   </data>
+  <data name="AccessibleActionDoubleClick" xml:space="preserve">
+    <value>Double Click</value>
+  </data>
 </root>

src/System.Windows.Forms/src/System/Windows/Forms/AccessibleObject.cs

@@ -42,7 +42,8 @@ public partial class AccessibleObject :
         UiaCore.ISelectionProvider,
         UiaCore.ISelectionItemProvider,
         UiaCore.IRawElementProviderHwndOverride,
-        UiaCore.IScrollItemProvider
+        UiaCore.IScrollItemProvider,
+        UiaCore.IMultipleViewProvider
     {
         /// <summary>
         ///  Specifies the <see cref='IAccessible'/> interface used by this <see cref='AccessibleObject'/>.
@@ -482,6 +483,16 @@ internal virtual void SetValue(string? newValue)
 
         internal virtual UiaCore.IRawElementProviderSimple? GetOverrideProviderForHwnd(IntPtr hwnd) => null;
 
+        internal virtual int GetMultiViewProviderCurrentView() => 0;
+
+        internal virtual int[]? GetMultiViewProviderSupportedViews() => Array.Empty<int>();
+
+        internal virtual string GetMultiViewProviderViewName(int viewId) => string.Empty;
+
+        internal virtual void SetMultiViewProviderCurrentView(int viewId)
+        {
+        }
+
         internal virtual void SetValue(double newValue)
         {
         }
@@ -1782,6 +1793,14 @@ MemberInfo[] IReflect.GetMembers(BindingFlags bindingAttr)
         UiaCore.IRawElementProviderSimple? UiaCore.IRawElementProviderHwndOverride.GetOverrideProviderForHwnd(IntPtr hwnd)
             => GetOverrideProviderForHwnd(hwnd);
 
+        int UiaCore.IMultipleViewProvider.CurrentView => GetMultiViewProviderCurrentView();
+
+        int[]? UiaCore.IMultipleViewProvider.GetSupportedViews() => GetMultiViewProviderSupportedViews();
+
+        string? UiaCore.IMultipleViewProvider.GetViewName(int viewId) => GetMultiViewProviderViewName(viewId);
+
+        void UiaCore.IMultipleViewProvider.SetCurrentView(int viewId) => SetMultiViewProviderCurrentView(viewId);
+
         BOOL UiaCore.IRangeValueProvider.IsReadOnly => IsReadOnly ? BOOL.TRUE : BOOL.FALSE;
 
         double UiaCore.IRangeValueProvider.LargeChange => LargeChange;

src/System.Windows.Forms/src/System/Windows/Forms/ColumnHeader.ListViewColumnHeaderAccessibleObject.cs

@@ -0,0 +1,29 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using static Interop.UiaCore;
+
+namespace System.Windows.Forms
+{
+    public partial class ColumnHeader
+    {
+        internal class ListViewColumnHeaderAccessibleObject : AccessibleObject
+        {
+            private readonly ColumnHeader _owningColumnHeader;
+
+            public ListViewColumnHeaderAccessibleObject(ColumnHeader columnHeader)
+            {
+                _owningColumnHeader = columnHeader ?? throw new ArgumentNullException(nameof(columnHeader));
+            }
+
+            internal override object? GetPropertyValue(UIA propertyID)
+                => propertyID switch
+                {
+                    UIA.ControlTypePropertyId => UIA.HeaderItemControlTypeId,
+                    UIA.NamePropertyId => _owningColumnHeader.Text,
+                    _ => base.GetPropertyValue(propertyID)
+                };
+        }
+    }
+}

src/System.Windows.Forms/src/System/Windows/Forms/ColumnHeader.cs

@@ -19,7 +19,7 @@ namespace System.Windows.Forms
     [DesignTimeVisible(false)]
     [DefaultProperty(nameof(Text))]
     [TypeConverter(typeof(ColumnHeaderConverter))]
-    public class ColumnHeader : Component, ICloneable
+    public partial class ColumnHeader : Component, ICloneable
     {
         // disable csharp compiler warning #0414: field assigned unused value
 #pragma warning disable 0414
@@ -32,6 +32,7 @@ public class ColumnHeader : Component, ICloneable
         // Use TextAlign property instead of this member variable, always
         private HorizontalAlignment _textAlign = HorizontalAlignment.Left;
         private bool _textAlignInitialized;
+        private AccessibleObject _accessibilityObject;
         private readonly ColumnHeaderImageListIndexer _imageIndexer;
 
         // We need to send some messages to ListView when it gets initialized.
@@ -76,6 +77,19 @@ public ColumnHeader(string imageKey) : this()
             ImageKey = imageKey;
         }
 
+        internal AccessibleObject AccessibilityObject
+        {
+            get
+            {
+                if (_accessibilityObject is null)
+                {
+                    _accessibilityObject = new ListViewColumnHeaderAccessibleObject(this);
+                }
+
+                return _accessibilityObject;
+            }
+        }
+
         internal int ActualImageIndex_Internal
         {
             get