Add ColorPicker base enums

src/Avalonia.Controls/ColorPicker/ColorPickerHsvChannel.cs

@@ -0,0 +1,33 @@
+// This source file is adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Defines a specific HSV color model channel.
+    /// </summary>
+    public enum ColorPickerHsvChannel
+    {
+        /// <summary>
+        /// The Hue channel.
+        /// </summary>
+        Hue,
+
+        /// <summary>
+        /// The Saturation channel.
+        /// </summary>
+        Saturation,
+
+        /// <summary>
+        /// The Value channel.
+        /// </summary>
+        Value,
+
+        /// <summary>
+        /// The Alpha channel.
+        /// </summary>
+        Alpha
+    };
+}

src/Avalonia.Controls/ColorPicker/ColorSpectrum/IncrementAmount.cs

@@ -0,0 +1,23 @@
+// This source file is adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+namespace Avalonia.Controls.Primitives
+{
+    /// <summary>
+    /// Defines a relative amount that a color channel should be incremented.
+    /// </summary>
+    internal enum IncrementAmount
+    {
+        /// <summary>
+        /// A smaller change in value.
+        /// </summary>
+        Small,
+
+        /// <summary>
+        /// A larger change in value.
+        /// </summary>
+        Large,
+    };
+}

src/Avalonia.Controls/ColorPicker/ColorSpectrum/IncrementDirection.cs

@@ -0,0 +1,23 @@
+// This source file is adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+namespace Avalonia.Controls.Primitives
+{
+    /// <summary>
+    /// Defines the direction a color channel should be incremented.
+    /// </summary>
+    internal enum IncrementDirection
+    {
+        /// <summary>
+        /// Decreasing in value towards zero.
+        /// </summary>
+        Lower,
+
+        /// <summary>
+        /// Increasing in value towards positive infinity.
+        /// </summary>
+        Higher,
+    };
+}

src/Avalonia.Controls/ColorPicker/ColorSpectrumChannels.cs

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+// This source file is adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+using Avalonia.Controls.Primitives;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Defines the two HSV color channels displayed by a <see cref="ColorSpectrum"/>.
+    /// Order of the color channels is important.
+    /// </summary>
+    public enum ColorSpectrumChannels
+    {
+        /// <summary>
+        /// The Hue and Value channels.
+        /// </summary>
+        HueValue,
+
+        /// <summary>
+        /// The Value and Hue channels.
+        /// </summary>
+        ValueHue,
+
+        /// <summary>
+        /// The Hue and Saturation channels.
+        /// </summary>
+        HueSaturation,
+
+        /// <summary>
+        /// The Saturation and Hue channels.
+        /// </summary>
+        SaturationHue,
+
+        /// <summary>
+        /// The Saturation and Value channels.
+        /// </summary>
+        SaturationValue,
+
+        /// <summary>
+        /// The Value and Saturation channels.
+        /// </summary>
+        ValueSaturation,
+    };
+}

src/Avalonia.Controls/ColorPicker/ColorSpectrumShape.cs

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+// This source file is adapted from the WinUI project.
+// (https://github.com/microsoft/microsoft-ui-xaml)
+//
+// Licensed to The Avalonia Project under the MIT License.
+
+using Avalonia.Controls.Primitives;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Defines the shape of a <see cref="ColorSpectrum"/>.
+    /// </summary>
+    public enum ColorSpectrumShape
+    {
+        /// <summary>
+        /// The spectrum is in the shape of a rectangular or square box.
+        /// Note that more colors are visible to the user in Box shape.
+        /// </summary>
+        Box,
+
+        /// <summary>
+        /// The spectrum is in the shape of an ellipse or circle.
+        /// </summary>
+        Ring,
+    };
+}