Update color picker (#668)

src/Calculator/EquationStylePanelControl.xaml.h

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+#include "EquationStylePanelControl.g.h"
+#include "CalcViewModel/Common/Utils.h"
+
+namespace CalculatorApp
+{
+	[Windows::Foundation::Metadata::WebHostHidden] public ref class EquationStylePanelControl sealed
+	{
+	public:
+        EquationStylePanelControl();
+        DEPENDENCY_PROPERTY_OWNER(EquationStylePanelControl);
+
+        DEPENDENCY_PROPERTY_WITH_CALLBACK(Windows::UI::Xaml::Media::SolidColorBrush ^, SelectedColor);
+
+        property Windows::Foundation::Collections::IVector<Windows::UI::Xaml::Media::SolidColorBrush^>^ AvailableColors
+        {
+            Windows::Foundation::Collections::IVector<Windows::UI::Xaml::Media::SolidColorBrush^>^ get() {
+                return m_AvailableColors;
+            }
+        }
+
+	private:
+        void InitializeAvailableColors();
+        void SelectionChanged(Platform::Object ^ sender, Windows::UI::Xaml::Controls::SelectionChangedEventArgs ^ e);
+        void OnSelectedColorPropertyChanged(Windows::UI::Xaml::Media::SolidColorBrush ^ oldValue, Windows::UI::Xaml::Media::SolidColorBrush ^ newValue);
+        void ColorChooserLoaded(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
+        void SelectColor(Windows::UI::Xaml::Media::SolidColorBrush ^ selectedColor);
+
+        Windows::Foundation::Collections::IVector<Windows::UI::Xaml::Media::SolidColorBrush ^>^ m_AvailableColors;
+    };
+}