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EllipseViewRenderer.cs
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EllipseViewRenderer.cs
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using System.ComponentModel;
using Android.Content;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
[assembly: ExportRenderer(typeof(Xamarin.FormsBook.Platform.EllipseView),
typeof(Xamarin.FormsBook.Platform.Android.EllipseViewRenderer))]
namespace Xamarin.FormsBook.Platform.Android
{
public class EllipseViewRenderer : ViewRenderer<EllipseView, EllipseDrawableView>
{
double width, height;
public EllipseViewRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<EllipseView> args)
{
base.OnElementChanged(args);
if (Control == null)
{
SetNativeControl(new EllipseDrawableView(Context));
}
if (args.NewElement != null)
{
SetColor();
SetSize();
}
}
protected override void OnElementPropertyChanged(object sender,
PropertyChangedEventArgs args)
{
base.OnElementPropertyChanged(sender, args);
if (args.PropertyName == VisualElement.WidthProperty.PropertyName)
{
width = Element.Width;
SetSize();
}
else if (args.PropertyName == VisualElement.HeightProperty.PropertyName)
{
height = Element.Height;
SetSize();
}
else if (args.PropertyName == EllipseView.ColorProperty.PropertyName)
{
SetColor();
}
}
void SetColor()
{
Control.SetColor(Element.Color);
}
void SetSize()
{
Control.SetSize(width, height);
}
}
}