Add new ColorChangedEventArgs

src/Avalonia.Controls/ColorPicker/ColorChangedEventArgs.cs

@@ -0,0 +1,59 @@
+// Portions of this source file are adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+using System;
+using Avalonia.Media;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Holds the details of a ColorChanged event.
+    /// </summary>
+    /// <remarks>
+    /// HSV color information is intentionally not provided.
+    /// Use <see cref="Color.ToHsv()"/> to obtain it.
+    /// </remarks>
+    public class ColorChangedEventArgs : EventArgs
+    {
+        private Color _OldColor;
+        private Color _NewColor;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ColorChangedEventArgs"/> class.
+        /// </summary>
+        public ColorChangedEventArgs()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ColorChangedEventArgs"/> class.
+        /// </summary>
+        /// <param name="oldColor">The old/original color from before the change event.</param>
+        /// <param name="newColor">The new/updated color that triggered the change event.</param>
+        public ColorChangedEventArgs(Color oldColor, Color newColor)
+        {
+            _OldColor = oldColor;
+            _NewColor = newColor;
+        }
+
+        /// <summary>
+        /// Gets the old/original color from before the change event.
+        /// </summary>
+        public Color OldColor
+        {
+            get => _OldColor;
+            internal set => _OldColor = value;
+        }
+
+        /// <summary>
+        /// Gets the new/updated color that triggered the change event.
+        /// </summary>
+        public Color NewColor
+        {
+            get => _NewColor;
+            internal set => _NewColor = value;
+        }
+    }
+}