Add SetEnabledAction

src/Avalonia.Xaml.Interactions.Custom/Actions/SetEnabledAction.cs

@@ -0,0 +1,66 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// Sets the <see cref="Control.IsEnabled"/> property of a control when executed.
+/// </summary>
+public class SetEnabledAction : StyledElementAction
+{
+    /// <summary>
+    /// Identifies the <seealso cref="TargetControl"/> avalonia property.
+    /// </summary>
+    public static readonly StyledProperty<Control?> TargetControlProperty =
+        AvaloniaProperty.Register<SetEnabledAction, Control?>(nameof(TargetControl));
+
+    /// <summary>
+    /// Identifies the <seealso cref="IsEnabledValue"/> avalonia property.
+    /// </summary>
+    public static readonly StyledProperty<bool> IsEnabledValueProperty =
+        AvaloniaProperty.Register<SetEnabledAction, bool>(nameof(IsEnabledValue), true);
+
+    /// <summary>
+    /// Gets or sets the target control. This is an avalonia property.
+    /// </summary>
+    [ResolveByName]
+    public Control? TargetControl
+    {
+        get => GetValue(TargetControlProperty);
+        set => SetValue(TargetControlProperty, value);
+    }
+
+    /// <summary>
+    /// Gets or sets the value to assign to <see cref="Control.IsEnabled"/>.
+    /// This is an avalonia property.
+    /// </summary>
+    public bool IsEnabledValue
+    {
+        get => GetValue(IsEnabledValueProperty);
+        set => SetValue(IsEnabledValueProperty, value);
+    }
+
+    /// <summary>
+    /// Executes the action.
+    /// </summary>
+    /// <param name="sender">The <see cref="object"/> that is passed to the action by the behavior.</param>
+    /// <param name="parameter">The value of this parameter is determined by the caller.</param>
+    /// <returns>True if the property is successfully updated; else false.</returns>
+    public override object Execute(object? sender, object? parameter)
+    {
+        if (!IsEnabled)
+        {
+            return false;
+        }
+
+        var control = TargetControl ?? sender as Control;
+        if (control is null)
+        {
+            return false;
+        }
+
+        control.SetCurrentValue(InputElement.IsEnabledProperty, IsEnabledValue);
+        return true;
+    }
+}