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using System;
using System.ComponentModel;
using System.IO;
using System.Threading.Tasks;
using Android.Graphics;
using AImageView = Android.Widget.ImageView;
namespace Xamarin.Forms.Platform.Android
{
public class ImageRenderer : ViewRenderer<Image, AImageView>
{
bool _isDisposed;
IElementController ElementController => Element as IElementController;
public ImageRenderer()
{
AutoPackage = false;
}
protected override void Dispose(bool disposing)
{
if (_isDisposed)
return;
_isDisposed = true;
base.Dispose(disposing);
}
protected override AImageView CreateNativeControl()
{
return new FormsImageView(Context);
}
protected override void OnElementChanged(ElementChangedEventArgs<Image> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
var view = CreateNativeControl();
SetNativeControl(view);
}
UpdateBitmap(e.OldElement);
UpdateAspect();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Image.SourceProperty.PropertyName)
UpdateBitmap();
else if (e.PropertyName == Image.AspectProperty.PropertyName)
UpdateAspect();
}
void UpdateAspect()
{
AImageView.ScaleType type = Element.Aspect.ToScaleType();
Control.SetScaleType(type);
}
async void UpdateBitmap(Image previous = null)
{
if (Device.IsInvokeRequired)
throw new InvalidOperationException("Image Bitmap must not be updated from background thread");
Bitmap bitmap = null;
ImageSource source = Element.Source;
IImageSourceHandler handler;
if (previous != null && Equals(previous.Source, Element.Source))
return;
((IImageController)Element).SetIsLoading(true);
var formsImageView = Control as FormsImageView;
if (formsImageView != null)
formsImageView.SkipInvalidate();
Control.SetImageResource(global::Android.Resource.Color.Transparent);
if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null)
{
try
{
bitmap = await handler.LoadImageAsync(source, Context);
}
catch (TaskCanceledException)
{
}
catch (IOException ex)
{
Log.Warning("Xamarin.Forms.Platform.Android.ImageRenderer", "Error updating bitmap: {0}", ex);
}
}
if (Element == null || !Equals(Element.Source, source))
return;
if (!_isDisposed)
{
Control.SetImageBitmap(bitmap);
bitmap?.Dispose();
((IImageController)Element).SetIsLoading(false);
((IVisualElementController)Element).NativeSizeChanged();
}
}
}
}
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