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using System;
using System.ComponentModel;
using AppKit;
namespace Xamarin.Forms.Platform.MacOS
{
public class ImageRenderer : ViewRenderer<Image, NSImageView>
{
bool _isDisposed;
protected override void Dispose(bool disposing)
{
if (_isDisposed)
return;
if (disposing)
{
NSImage oldUIImage;
if (Control != null && (oldUIImage = Control.Image) != null)
{
oldUIImage.Dispose();
}
}
_isDisposed = true;
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs<Image> e)
{
if (Control == null)
{
var imageView = new FormsNSImageView();
SetNativeControl(imageView);
}
if (e.NewElement != null)
{
SetAspect();
SetImage(e.OldElement);
SetOpacity();
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Image.SourceProperty.PropertyName)
SetImage();
else if (e.PropertyName == Image.IsOpaqueProperty.PropertyName)
SetOpacity();
else if (e.PropertyName == Image.AspectProperty.PropertyName)
SetAspect();
}
void SetAspect()
{
//TODO: Implement set Image Aspect
//Control.ContentMode = Element.Aspect.ToUIViewContentMode();
}
async void SetImage(Image oldElement = null)
{
var source = Element.Source;
if (oldElement != null)
{
var oldSource = oldElement.Source;
if (Equals(oldSource, source))
return;
var imageSource = oldSource as FileImageSource;
if (imageSource != null && source is FileImageSource && imageSource.File == ((FileImageSource)source).File)
return;
Control.Image = null;
}
IImageSourceHandler handler;
((IImageController)Element).SetIsLoading(true);
if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null)
{
NSImage uiimage;
try
{
uiimage = await handler.LoadImageAsync(source, scale: (float)NSScreen.MainScreen.BackingScaleFactor);
}
catch (OperationCanceledException)
{
uiimage = null;
}
var imageView = Control;
if (imageView != null)
imageView.Image = uiimage;
if (!_isDisposed)
((IVisualElementController)Element).NativeSizeChanged();
}
else
Control.Image = null;
if (!_isDisposed)
((IImageController)Element).SetIsLoading(false);
}
void SetOpacity()
{
(Control as FormsNSImageView)?.SetIsOpaque(Element.IsOpaque);
}
}
}
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