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using System.IO;
using System.Threading;
using System.Threading.Tasks;
using AppKit;
namespace Xamarin.Forms.Platform.MacOS
{
public interface IImageSourceHandler : IRegisterable
{
Task<NSImage> LoadImageAsync(ImageSource imagesource, CancellationToken cancelationToken = default(CancellationToken),
float scale = 1);
}
public sealed class FileImageSourceHandler : IImageSourceHandler
{
public Task<NSImage> LoadImageAsync(ImageSource imagesource,
CancellationToken cancelationToken = default(CancellationToken), float scale = 1f)
{
NSImage image = null;
var filesource = imagesource as FileImageSource;
var file = filesource?.File;
if (!string.IsNullOrEmpty(file))
image = File.Exists(file) ? new NSImage(file) : null;
return Task.FromResult(image);
}
}
public sealed class StreamImagesourceHandler : IImageSourceHandler
{
public async Task<NSImage> LoadImageAsync(ImageSource imagesource,
CancellationToken cancelationToken = default(CancellationToken), float scale = 1f)
{
NSImage image = null;
var streamsource = imagesource as StreamImageSource;
if (streamsource?.Stream == null) return null;
using (
var streamImage = await ((IStreamImageSource)streamsource).GetStreamAsync(cancelationToken).ConfigureAwait(false))
{
if (streamImage != null)
image = NSImage.FromStream(streamImage);
}
return image;
}
}
public sealed class ImageLoaderSourceHandler : IImageSourceHandler
{
public async Task<NSImage> LoadImageAsync(ImageSource imagesource,
CancellationToken cancelationToken = default(CancellationToken), float scale = 1f)
{
NSImage image = null;
var imageLoader = imagesource as UriImageSource;
if (imageLoader != null && imageLoader.Uri != null)
{
using (var streamImage = await imageLoader.GetStreamAsync(cancelationToken).ConfigureAwait(false))
{
if (streamImage != null)
image = NSImage.FromStream(streamImage);
}
}
return image;
}
}
}
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