Review PR, adjustments

src/Umbraco.Core/Events/CancellableObjectEventArgsOfTEventObject.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+
+namespace Umbraco.Core.Events
+{
+    /// <summary>
+    /// Represent event data, for events that support cancellation, and expose an impacted object.
+    /// </summary>
+    /// <typeparam name="TEventObject">The type of the exposed, impacted object.</typeparam>
+    public class CancellableObjectEventArgs<TEventObject> : CancellableObjectEventArgs, IEquatable<CancellableObjectEventArgs<TEventObject>>
+    {
+        public CancellableObjectEventArgs(TEventObject eventObject, bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
+            : base(eventObject, canCancel, messages, additionalData)
+        {
+        }
+
+        public CancellableObjectEventArgs(TEventObject eventObject, bool canCancel, EventMessages eventMessages)
+            : base(eventObject, canCancel, eventMessages)
+        {
+        }
+
+        public CancellableObjectEventArgs(TEventObject eventObject, EventMessages eventMessages)
+            : base(eventObject, eventMessages)
+        {
+        }
+
+        public CancellableObjectEventArgs(TEventObject eventObject, bool canCancel)
+            : base(eventObject, canCancel)
+        {
+        }
+
+        public CancellableObjectEventArgs(TEventObject eventObject)
+            : base(eventObject)
+        {
+        }
+
+        /// <summary>
+        /// Gets or sets the impacted object.
+        /// </summary>
+        /// <remarks>
+        /// This is protected so that inheritors can expose it with their own name
+        /// </remarks>
+        protected new TEventObject EventObject
+        {
+            get => (TEventObject) base.EventObject;
+            set => base.EventObject = value;
+        }
+
+        public bool Equals(CancellableObjectEventArgs<TEventObject> other)
+        {
+            if (other is null) return false;
+            if (ReferenceEquals(this, other)) return true;
+            return base.Equals(other) && EqualityComparer<TEventObject>.Default.Equals(EventObject, other.EventObject);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is null) return false;
+            if (ReferenceEquals(this, obj)) return true;
+            if (obj.GetType() != this.GetType()) return false;
+            return Equals((CancellableObjectEventArgs<TEventObject>)obj);
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                return (base.GetHashCode() * 397) ^ EqualityComparer<TEventObject>.Default.GetHashCode(EventObject);
+            }
+        }
+
+        public static bool operator ==(CancellableObjectEventArgs<TEventObject> left, CancellableObjectEventArgs<TEventObject> right)
+        {
+            return Equals(left, right);
+        }
+
+        public static bool operator !=(CancellableObjectEventArgs<TEventObject> left, CancellableObjectEventArgs<TEventObject> right)
+        {
+            return !Equals(left, right);
+        }
+    }
+}