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VDownload.Toolkit/VDownload.Toolkit.UI/VDownload.Toolkit.UI.Behaviors/EventToCommandBehavior.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.Xaml.Interactivity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace VDownload.Toolkit.UI.Behaviors
+{
+    public class EventToCommandBehavior : Behavior<FrameworkElement>
+    {
+        #region FIELDS
+
+        private Delegate _handler;
+        private EventInfo _oldEvent;
+
+        #endregion
+
+
+
+        #region PROPERTIES
+
+        public string Event { get { return (string)GetValue(EventProperty); } set { SetValue(EventProperty, value); } }
+        public static readonly DependencyProperty EventProperty = DependencyProperty.Register("Event", typeof(string), typeof(EventToCommandBehavior), new PropertyMetadata(null, OnEventChanged));
+
+        public ICommand Command { get { return (ICommand)GetValue(CommandProperty); } set { SetValue(CommandProperty, value); } }
+        public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(EventToCommandBehavior), new PropertyMetadata(null));
+
+        public bool PassArguments { get { return (bool)GetValue(PassArgumentsProperty); } set { SetValue(PassArgumentsProperty, value); } }
+        public static readonly DependencyProperty PassArgumentsProperty = DependencyProperty.Register("PassArguments", typeof(bool), typeof(EventToCommandBehavior), new PropertyMetadata(false));
+
+        #endregion
+
+
+
+        #region PRIVATE METHODS
+
+        private static void OnEventChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            EventToCommandBehavior beh = (EventToCommandBehavior)d;
+
+            if (beh.AssociatedObject != null)
+            {
+                beh.AttachHandler((string)e.NewValue);
+            }
+        }
+
+        protected override void OnAttached()
+        {
+            AttachHandler(this.Event);
+        }
+
+        private void AttachHandler(string eventName)
+        {
+            if (_oldEvent != null)
+            {
+                _oldEvent.RemoveEventHandler(this.AssociatedObject, _handler);
+            }
+
+            if (!string.IsNullOrEmpty(eventName))
+            {
+                EventInfo ei = this.AssociatedObject.GetType().GetEvent(eventName);
+                if (ei != null)
+                {
+                    MethodInfo mi = this.GetType().GetMethod("ExecuteCommand", BindingFlags.Instance | BindingFlags.NonPublic);
+                    _handler = Delegate.CreateDelegate(ei.EventHandlerType, this, mi);
+                    ei.AddEventHandler(this.AssociatedObject, _handler);
+                    _oldEvent = ei;
+                }
+                else
+                {
+                    throw new ArgumentException(string.Format("The event '{0}' was not found on type '{1}'", eventName, this.AssociatedObject.GetType().Name));
+                }
+            }
+        }
+
+        private void ExecuteCommand(object sender, object e)
+        {
+            object parameter = this.PassArguments ? e : null;
+            if (this.Command != null && this.Command.CanExecute(parameter))
+            {
+                this.Command.Execute(parameter);
+            }
+        }
+
+        #endregion
+    }
+}