feat(ColorPicker): Add ColorPicker, ColorPickerSlider & ColorSpectrum

src/Uno.UI/Helpers/WinUI/DownlevelHelper.cs

@@ -0,0 +1,13 @@
+namespace Uno.UI.Helpers.WinUI
+{
+	// Uno Docs: This is implemented completely differently from the WinUI source which is generated.
+	// Several properties/methods are also omitted.
+	// See: https://github.com/microsoft/microsoft-ui-xaml/blob/master/dev/inc/DownlevelHelper.h
+	internal class DownlevelHelper
+	{
+		public static bool ToDisplayNameExists()
+		{
+			return false;
+		}
+	}
+}

src/Uno.UI/Helpers/WinUI/ResourceAccessor.ResourceKeys.cs

@@ -0,0 +1,52 @@
+namespace Uno.UI.Helpers.WinUI
+{
+	internal partial class ResourceAccessor
+	{
+		// ColorPicker, ColorPickerSlider, ColorSpectrum
+		public const string SR_TextAlphaLabel = "TextAlphaLabel";
+		public const string SR_AutomationNameAlphaSlider = "AutomationNameAlphaSlider";
+		public const string SR_AutomationNameAlphaTextBox = "AutomationNameAlphaTextBox";
+		public const string SR_AutomationNameHueSlider = "AutomationNameHueSlider";
+		public const string SR_AutomationNameSaturationSlider = "AutomationNameSaturationSlider";
+		public const string SR_AutomationNameValueSlider = "AutomationNameValueSlider";
+		public const string SR_TextBlueLabel = "TextBlueLabel";
+		public const string SR_AutomationNameBlueTextBox = "AutomationNameBlueTextBox";
+		public const string SR_AutomationNameColorModelComboBox = "AutomationNameColorModelComboBox";
+		public const string SR_AutomationNameColorSpectrum = "AutomationNameColorSpectrum";
+		public const string SR_TextGreenLabel = "TextGreenLabel";
+		public const string SR_AutomationNameGreenTextBox = "AutomationNameGreenTextBox";
+		public const string SR_HelpTextColorSpectrum = "HelpTextColorSpectrum";
+		public const string SR_AutomationNameHexTextBox = "AutomationNameHexTextBox";
+		public const string SR_ContentHSVComboBoxItem = "ContentHSVComboBoxItem";
+		public const string SR_TextHueLabel = "TextHueLabel";
+		public const string SR_AutomationNameHueTextBox = "AutomationNameHueTextBox";
+		public const string SR_LocalizedControlTypeColorSpectrum = "LocalizedControlTypeColorSpectrum";
+		public const string SR_TextRedLabel = "TextRedLabel";
+		public const string SR_AutomationNameRedTextBox = "AutomationNameRedTextBox";
+		public const string SR_ContentRGBComboBoxItem = "ContentRGBComboBoxItem";
+		public const string SR_TextSaturationLabel = "TextSaturationLabel";
+		public const string SR_AutomationNameSaturationTextBox = "AutomationNameSaturationTextBox";
+		public const string SR_TextValueLabel = "TextValueLabel";
+		public const string SR_ValueStringColorSpectrumWithColorName = "ValueStringColorSpectrumWithColorName";
+		public const string SR_ValueStringColorSpectrumWithoutColorName = "ValueStringColorSpectrumWithoutColorName";
+		public const string SR_ValueStringHueSliderWithColorName = "ValueStringHueSliderWithColorName";
+		public const string SR_ValueStringHueSliderWithoutColorName = "ValueStringHueSliderWithoutColorName";
+		public const string SR_ValueStringSaturationSliderWithColorName = "ValueStringSaturationSliderWithColorName";
+		public const string SR_ValueStringSaturationSliderWithoutColorName = "ValueStringSaturationSliderWithoutColorName";
+		public const string SR_ValueStringValueSliderWithColorName = "ValueStringValueSliderWithColorName";
+		public const string SR_ValueStringValueSliderWithoutColorName = "ValueStringValueSliderWithoutColorName";
+		public const string SR_AutomationNameValueTextBox = "AutomationNameValueTextBox";
+		public const string SR_ToolTipStringAlphaSlider = "ToolTipStringAlphaSlider";
+		public const string SR_ToolTipStringHueSliderWithColorName = "ToolTipStringHueSliderWithColorName";
+		public const string SR_ToolTipStringHueSliderWithoutColorName = "ToolTipStringHueSliderWithoutColorName";
+		public const string SR_ToolTipStringSaturationSliderWithColorName = "ToolTipStringSaturationSliderWithColorName";
+		public const string SR_ToolTipStringSaturationSliderWithoutColorName = "ToolTipStringSaturationSliderWithoutColorName";
+		public const string SR_ToolTipStringValueSliderWithColorName = "ToolTipStringValueSliderWithColorName";
+		public const string SR_ToolTipStringValueSliderWithoutColorName = "ToolTipStringValueSliderWithoutColorName";
+		public const string SR_AutomationNameMoreButtonCollapsed = "AutomationNameMoreButtonCollapsed";
+		public const string SR_AutomationNameMoreButtonExpanded = "AutomationNameMoreButtonExpanded";
+		public const string SR_HelpTextMoreButton = "HelpTextMoreButton";
+		public const string SR_TextMoreButtonLabelCollapsed = "TextMoreButtonLabelCollapsed";
+		public const string SR_TextMoreButtonLabelExpanded = "TextMoreButtonLabelExpanded";
+	}
+}

src/Uno.UI/Helpers/WinUI/ResourceAccessor.cs

@@ -17,7 +17,7 @@
 
 namespace Uno.UI.Helpers.WinUI
 {
-	internal class ResourceAccessor
+	internal partial class ResourceAccessor
 	{
 		public const string MUXCONTROLS_PACKAGE_NAME = "Microsoft.UI.Xaml.3.0";
 		private const string c_resourceLoc = "Microsoft.UI.Xaml/Resources";

src/Uno.UI/Microsoft/UI/Xaml/Controls/ColorPicker/ColorChangedEventArgs.cs

@@ -0,0 +1,22 @@
+using Windows.UI;
+
+namespace Microsoft.UI.Xaml.Controls
+{
+	public class ColorChangedEventArgs : IColorChangedEventArgs
+	{
+		private Color m_oldColor;
+		private Color m_newColor;
+
+		public Color OldColor
+		{
+			get => m_oldColor;
+			internal set => m_oldColor = value;
+		}
+
+		public Color NewColor
+		{
+			get => m_newColor;
+			internal set => m_newColor = value;
+		}
+	}
+}