Xamarin.Forms.Platform.WinRT/ProgressBarRenderer.cs


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using System.ComponentModel;
using Windows.UI.Xaml.Controls.Primitives;
using Xamarin.Forms.Internals;

#if WINDOWS_UWP

namespace Xamarin.Forms.Platform.UWP
#else

namespace Xamarin.Forms.Platform.WinRT
#endif
{
	public class ProgressBarRenderer : ViewRenderer<ProgressBar, Windows.UI.Xaml.Controls.ProgressBar>
	{
		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				if (Control != null)
				{
					Control.ValueChanged -= ProgressBarOnValueChanged;
				}
			}

			base.Dispose(disposing);
		}

		protected override void OnElementChanged(ElementChangedEventArgs<ProgressBar> e)
		{
			base.OnElementChanged(e);

			if (e.NewElement != null)
			{
				if (Control == null)
				{
					var progressBar = new Windows.UI.Xaml.Controls.ProgressBar { Minimum = 0, Maximum = 1 };

					progressBar.ValueChanged += ProgressBarOnValueChanged;

					SetNativeControl(progressBar);
				}

				Control.Value = e.NewElement.Progress;
			}
		}

		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			base.OnElementPropertyChanged(sender, e);

			if (e.PropertyName == ProgressBar.ProgressProperty.PropertyName)
				Control.Value = Element.Progress;
		}

		void ProgressBarOnValueChanged(object sender, RangeBaseValueChangedEventArgs rangeBaseValueChangedEventArgs)
		{
			((IVisualElementController)Element)?.InvalidateMeasure(InvalidationTrigger.MeasureChanged);
		}
	}
}