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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;
}
}
}
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