Added basic date/time picker automation peers. (#17426)

src/Avalonia.Controls/Automation/Peers/DatePickerAutomationPeer.cs

@@ -0,0 +1,25 @@
+using System;
+using Avalonia.Automation.Provider;
+using Avalonia.Controls;
+
+namespace Avalonia.Automation.Peers;
+
+public class DatePickerAutomationPeer : ControlAutomationPeer, IValueProvider
+{
+    public DatePickerAutomationPeer(DatePicker owner)
+        : base(owner)
+    {
+    }
+
+    public bool IsReadOnly => false;
+    public new DatePicker Owner => (DatePicker)base.Owner;
+    public string? Value => Owner.SelectedDate?.ToString();
+
+    public void SetValue(string? value)
+    {
+        if (DateTimeOffset.TryParse(value, out var result))
+            Owner.SelectedDate = result;
+    }
+
+    protected override AutomationControlType GetAutomationControlTypeCore() => AutomationControlType.Custom;
+}

src/Avalonia.Controls/Automation/Peers/TimePickerAutomationPeer.cs

@@ -0,0 +1,25 @@
+using System;
+using Avalonia.Automation.Provider;
+using Avalonia.Controls;
+
+namespace Avalonia.Automation.Peers;
+
+public class TimePickerAutomationPeer : ControlAutomationPeer, IValueProvider
+{
+    public TimePickerAutomationPeer(TimePicker owner)
+        : base(owner)
+    {
+    }
+
+    public bool IsReadOnly => false;
+    public new TimePicker Owner => (TimePicker)base.Owner;
+    public string? Value => Owner.SelectedTime?.ToString();
+
+    public void SetValue(string? value)
+    {
+        if (TimeSpan.TryParse(value, out var result))
+            Owner.SelectedTime = result;
+    }
+
+    protected override AutomationControlType GetAutomationControlTypeCore() => AutomationControlType.Custom;
+}

src/Avalonia.Controls/DateTimePickers/DatePicker.cs

@@ -1,4 +1,5 @@
-using Avalonia.Controls.Metadata;
+using Avalonia.Automation.Peers;
+using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Shapes;
 using Avalonia.Data;
@@ -267,6 +268,8 @@ namespace Avalonia.Controls
             }
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer() => new DatePickerAutomationPeer(this);
+
         protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
         {
             base.OnPropertyChanged(change);

src/Avalonia.Controls/DateTimePickers/TimePicker.cs

@@ -6,6 +6,7 @@ using Avalonia.Layout;
 using System;
 using System.Globalization;
 using Avalonia.Controls.Utils;
+using Avalonia.Automation.Peers;
 
 namespace Avalonia.Controls
 {
@@ -330,6 +331,8 @@ namespace Avalonia.Controls
             }
         }
 
+        protected override AutomationPeer OnCreateAutomationPeer() => new TimePickerAutomationPeer(this);
+
         protected virtual void OnSelectedTimeChanged(TimeSpan? oldTime, TimeSpan? newTime)
         {
             SelectedTimeChanged?.Invoke(this, new TimePickerSelectedValueChangedEventArgs(oldTime, newTime));