1 files changed, 66 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/ProgressBarRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/ProgressBarRenderer.cs
new file mode 100644
index 00000000..7b3c84ae
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Renderers/ProgressBarRenderer.cs
@@ -0,0 +1,66 @@
+using System.ComponentModel;
+using AppKit;
+using CoreImage;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	public class ProgressBarRenderer : ViewRenderer<ProgressBar, NSProgressIndicator>
+	{
+		static CIColorPolynomial s_currentColorFilter;
+		static NSColor s_currentColor;
+
+		protected override void OnElementChanged(ElementChangedEventArgs<ProgressBar> e)
+		{
+			if (e.NewElement == null) return;
+			if (Control == null)
+				SetNativeControl(new NSProgressIndicator
+				{
+					IsDisplayedWhenStopped = true,
+					Style = NSProgressIndicatorStyle.Bar,
+					MinValue = 0,
+					MaxValue = 1
+				});
+			UpdateProgress();
+		}
+
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			base.OnElementPropertyChanged(sender, e);
+
+			if (e.PropertyName == ProgressBar.ProgressProperty.PropertyName)
+				UpdateProgress();
+		}
+
+		protected override void SetBackgroundColor(Color color)
+		{
+			if (Control == null)
+				return;
+
+			if (s_currentColorFilter == null && color.IsDefault)
+				return;
+
+			if (color.IsDefault)
+				Control.ContentFilters = new CIFilter[0];
+
+			var newColor = Element.BackgroundColor.ToNSColor();
+			if (Equals(s_currentColor, newColor))
+				return;
+
+			s_currentColor = newColor;
+
+			s_currentColorFilter = new CIColorPolynomial
+			{
+				RedCoefficients = new CIVector(s_currentColor.RedComponent),
+				BlueCoefficients = new CIVector(s_currentColor.BlueComponent),
+				GreenCoefficients = new CIVector(s_currentColor.GreenComponent)
+			};
+
+			Control.ContentFilters = new CIFilter[] { s_currentColorFilter };
+		}
+
+		void UpdateProgress()
+		{
+			Control.DoubleValue = Element.Progress;
+		}
+	}
+}
+\ No newline at end of file