[Input] JoystickHatState is now IEquatable

Source/OpenTK/Input/JoystickHatState.cs

@@ -34,7 +34,7 @@ namespace OpenTK.Input
     /// <summary>
     /// Describes the state of a joystick hat.
     /// </summary>
-    public struct JoystickHatState
+    public struct JoystickHatState : IEquatable<JoystickHatState>
     {
         HatPosition position;
 
@@ -113,6 +113,58 @@ namespace OpenTK.Input
                     Position == HatPosition.DownRight;
             }
         }
+
+        /// <summary>
+        /// Returns a <see cref="System.String"/> that represents the current <see cref="OpenTK.Input.JoystickHatState"/>.
+        /// </summary>
+        /// <returns>A <see cref="System.String"/> that represents the current <see cref="OpenTK.Input.JoystickHatState"/>.</returns>
+        public override string ToString()
+        {
+            return String.Format(
+                "{{{0}{1}{2}{3}}}",
+                IsUp ? "U" : String.Empty,
+                IsLeft ? "L" : String.Empty,
+                IsDown ? "D" : String.Empty,
+                IsRight ? "R" : String.Empty);
+        }
+
+        /// <summary>
+        /// Serves as a hash function for a <see cref="OpenTK.Input.JoystickHatState"/> object.
+        /// </summary>
+        /// <returns>A hash code for this instance that is suitable for use in hashing algorithms and data structures such as a
+        /// hash table.</returns>
+        public override int GetHashCode()
+        {
+            return Position.GetHashCode();
+        }
+
+        /// <summary>
+        /// Determines whether the specified <see cref="System.Object"/> is equal to the current <see cref="OpenTK.Input.JoystickHatState"/>.
+        /// </summary>
+        /// <param name="obj">The <see cref="System.Object"/> to compare with the current <see cref="OpenTK.Input.JoystickHatState"/>.</param>
+        /// <returns><c>true</c> if the specified <see cref="System.Object"/> is equal to the current
+        /// <see cref="OpenTK.Input.JoystickHatState"/>; otherwise, <c>false</c>.</returns>
+        public override bool Equals(object obj)
+        {
+            return
+                obj is JoystickHatState &&
+                Equals((JoystickHatState)obj);
+        }
+
+        #region IEquatable<JoystickHatState> implementation
+
+        /// <summary>
+        /// Determines whether the specified <see cref="OpenTK.Input.JoystickHatState"/> is equal to the current <see cref="OpenTK.Input.JoystickHatState"/>.
+        /// </summary>
+        /// <param name="other">The <see cref="OpenTK.Input.JoystickHatState"/> to compare with the current <see cref="OpenTK.Input.JoystickHatState"/>.</param>
+        /// <returns><c>true</c> if the specified <see cref="OpenTK.Input.JoystickHatState"/> is equal to the current
+        /// <see cref="OpenTK.Input.JoystickHatState"/>; otherwise, <c>false</c>.</returns>
+        public bool Equals(JoystickHatState other)
+        {
+            return Position == other.Position;
+        }
+
+        #endregion
     }
 }