Add basic support for automation for DataGrid and DataGridRow (#15174)

* Add basic support for automation for DataGrid and DataGridRow

* Add DataGridCellAutomationPeer

* Add DataGridColumnHeaderAutomationPeer

* Add DataGridColumnHeadersPresenterAutomationPeer

* Add DataGridDetailsPresenterAutomationPeer

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridAutomationPeer.cs

@@ -0,0 +1,18 @@
+using Avalonia.Automation.Peers;
+
+namespace Avalonia.Controls.Automation.Peers;
+
+public class DataGridAutomationPeer : ControlAutomationPeer
+{
+    public DataGridAutomationPeer(DataGrid owner)
+        : base(owner)
+    {
+    }
+
+    public new DataGrid Owner => (DataGrid)base.Owner;
+
+    protected override AutomationControlType GetAutomationControlTypeCore()
+    {
+        return AutomationControlType.DataGrid;
+    }
+}

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridCellAutomationPeer.cs

@@ -0,0 +1,22 @@
+using Avalonia.Automation.Peers;
+
+namespace Avalonia.Controls.Automation.Peers;
+
+public class DataGridCellAutomationPeer : ContentControlAutomationPeer
+{
+    public DataGridCellAutomationPeer(DataGridCell owner)
+        : base(owner)
+    {
+    }
+
+    public new DataGridCell Owner => (DataGridCell)base.Owner;
+
+    protected override AutomationControlType GetAutomationControlTypeCore()
+    {
+        return AutomationControlType.Custom;
+    }
+
+    protected override bool IsContentElementCore() => true;
+
+    protected override bool IsControlElementCore() => true;
+}

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridColumnHeaderAutomationPeer.cs

@@ -0,0 +1,22 @@
+using Avalonia.Automation.Peers;
+
+namespace Avalonia.Controls.Automation.Peers;
+
+public class DataGridColumnHeaderAutomationPeer : ContentControlAutomationPeer
+{
+    public DataGridColumnHeaderAutomationPeer(DataGridColumnHeader owner)
+        : base(owner)
+    {
+    }
+
+    public new DataGridColumnHeader Owner => (DataGridColumnHeader)base.Owner;
+
+    protected override AutomationControlType GetAutomationControlTypeCore()
+    {
+        return AutomationControlType.HeaderItem;
+    }
+
+    protected override bool IsContentElementCore() => false;
+
+    protected override bool IsControlElementCore() => true;
+}

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridColumnHeadersPresenterAutomationPeer.cs

@@ -0,0 +1,23 @@
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Primitives;
+
+namespace Avalonia.Controls.Automation.Peers;
+
+public class DataGridColumnHeadersPresenterAutomationPeer : ControlAutomationPeer
+{
+    public DataGridColumnHeadersPresenterAutomationPeer(DataGridColumnHeadersPresenter owner)
+        : base(owner)
+    {
+    }
+
+    public new DataGridColumnHeadersPresenter Owner => (DataGridColumnHeadersPresenter)base.Owner;
+
+    protected override AutomationControlType GetAutomationControlTypeCore()
+    {
+        return AutomationControlType.Header;
+    }
+
+    protected override bool IsContentElementCore() => false;
+
+    protected override bool IsControlElementCore() => true;
+}

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridDetailsPresenterAutomationPeer.cs

@@ -0,0 +1,14 @@
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Primitives;
+
+namespace Avalonia.Controls.Automation.Peers;
+
+public class DataGridDetailsPresenterAutomationPeer : ControlAutomationPeer
+{
+    public DataGridDetailsPresenterAutomationPeer(DataGridDetailsPresenter owner)
+        : base(owner)
+    {
+    }
+
+    public new DataGridDetailsPresenter Owner => (DataGridDetailsPresenter)base.Owner;
+}

src/Avalonia.Controls.DataGrid/Automation/Peers/DataGridRowAutomationPeer.cs

@@ -0,0 +1,20 @@
+using Avalonia.Controls;
+
+namespace Avalonia.Automation.Peers
+{
+    public class DataGridRowAutomationPeer : ControlAutomationPeer
+    {
+        public DataGridRowAutomationPeer(DataGridRow owner)
+            : base(owner)
+        {
+        }
+
+        protected override AutomationControlType GetAutomationControlTypeCore()
+        {
+            return AutomationControlType.DataItem;
+        }
+
+        protected override bool IsContentElementCore() => true;
+        protected override bool IsControlElementCore() => true;
+    }
+}

src/Avalonia.Controls.DataGrid/DataGrid.cs

@@ -22,6 +22,8 @@ using System.Text;
 using System.Linq;
 using Avalonia.Input.Platform;
 using System.ComponentModel.DataAnnotations;
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Automation.Peers;
 using Avalonia.Controls.Utils;
 using Avalonia.Layout;
 using Avalonia.Controls.Metadata;
@@ -800,6 +802,11 @@ namespace Avalonia.Controls
             UpdatePseudoClasses();
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridAutomationPeer(this);
+        }
+
         private void SetValueNoCallback<T>(AvaloniaProperty<T> property, T value, BindingPriority priority = BindingPriority.LocalValue)
         {
             _areHandlersSuspended = true;

src/Avalonia.Controls.DataGrid/DataGridCell.cs

@@ -3,6 +3,8 @@
 // Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details.
 // All other rights reserved.
 
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Automation.Peers;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Shapes;
@@ -123,6 +125,11 @@ namespace Avalonia.Controls
             }
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridCellAutomationPeer(this);
+        }
+
         /// <summary>
         /// Builds the visual tree for the cell control when a new template is applied.
         /// </summary>

src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs

@@ -6,7 +6,9 @@
 using System;
 using System.ComponentModel;
 using System.Diagnostics;
+using Avalonia.Automation.Peers;
 using Avalonia.Collections;
+using Avalonia.Controls.Automation.Peers;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Mixins;
 using Avalonia.Controls.Utils;
@@ -87,6 +89,11 @@ namespace Avalonia.Controls
             PointerExited += DataGridColumnHeader_PointerExited;
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridColumnHeaderAutomationPeer(this);
+        }
+
         private void OnAreSeparatorsVisibleChanged(AvaloniaPropertyChangedEventArgs e)
         {
             if (!_areHandlersSuspended)

src/Avalonia.Controls.DataGrid/DataGridRow.cs

@@ -15,6 +15,7 @@ using Avalonia.Utilities;
 using Avalonia.VisualTree;
 using System;
 using System.Diagnostics;
+using Avalonia.Automation.Peers;
 using Avalonia.Reactive;
 
 namespace Avalonia.Controls
@@ -150,6 +151,11 @@ namespace Avalonia.Controls
             Cells.CellRemoved += DataGridCellCollection_CellRemoved;
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridRowAutomationPeer(this);
+        }
+
         private void SetValueNoCallback<T>(AvaloniaProperty<T> property, T value, BindingPriority priority = BindingPriority.LocalValue)
         {
             _areHandlersSuspended = true;

src/Avalonia.Controls.DataGrid/Primitives/DataGridColumnHeadersPresenter.cs

@@ -8,6 +8,8 @@ using Avalonia.Media;
 using System;
 using System.Collections.Specialized;
 using System.Diagnostics;
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Automation.Peers;
 
 namespace Avalonia.Controls.Primitives
 {
@@ -126,6 +128,11 @@ namespace Avalonia.Controls.Primitives
             return true;
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridColumnHeadersPresenterAutomationPeer(this);
+        }
+
         /// <summary>
         /// Arranges the content of the <see cref="T:Avalonia.Controls.Primitives.DataGridColumnHeadersPresenter" />.
         /// </summary>

src/Avalonia.Controls.DataGrid/Primitives/DataGridDetailsPresenter.cs

@@ -6,6 +6,8 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Automation.Peers;
 using Avalonia.Media;
 
 namespace Avalonia.Controls.Primitives
@@ -43,6 +45,11 @@ namespace Avalonia.Controls.Primitives
             AffectsMeasure<DataGridDetailsPresenter>(ContentHeightProperty);
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer()
+        {
+            return new DataGridDetailsPresenterAutomationPeer(this);
+        }
+
         /// <summary>
         /// Arranges the content of the <see cref="T:Avalonia.Controls.Primitives.DataGridDetailsPresenter" />.
         /// </summary>