chore: separated System.Windows.Interactivity code

src/Shared/System.Windows.Interactivity/EventTrigger.cs

@@ -0,0 +1,28 @@
+using System.Windows;
+
+namespace HandyControl.Interactivity;
+
+public class EventTrigger : EventTriggerBase<object>
+{
+    public static readonly DependencyProperty EventNameProperty = DependencyProperty.Register("EventName", typeof(string), typeof(EventTrigger), new FrameworkPropertyMetadata("Loaded", OnEventNameChanged));
+
+    public EventTrigger()
+    {
+    }
+
+    public EventTrigger(string eventName) => EventName = eventName;
+
+    protected override string GetEventName() => EventName;
+
+    private static void OnEventNameChanged(object sender, DependencyPropertyChangedEventArgs args)
+    {
+        ((EventTrigger) sender).OnEventNameChanged((string) args.OldValue, (string) args.NewValue);
+    }
+
+    public string EventName
+    {
+        get => (string) GetValue(EventNameProperty);
+
+        set => SetValue(EventNameProperty, value);
+    }
+}