Add ColorViewTab enum

src/Avalonia.Controls.ColorPicker/ColorView/ColorViewTab.cs

@@ -0,0 +1,23 @@
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Defines a specific tab (subview) within the <see cref="ColorView"/>.
+    /// </summary>
+    public enum ColorViewTab
+    {
+        /// <summary>
+        /// The components view with sliders and numeric input boxes.
+        /// </summary>
+        Components,
+
+        /// <summary>
+        /// The color palette view with a grid of colors and shades.
+        /// </summary>
+        Palette,
+
+        /// <summary>
+        /// The color spectrum view with a box/ring spectrum and sliders.
+        /// </summary>
+        Spectrum,
+    }
+}