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using System.ComponentModel;
using System.Threading.Tasks;
using AppKit;
using Foundation;
namespace Xamarin.Forms.Platform.MacOS
{
public class ImageCellRenderer : TextCellRenderer
{
public override NSView GetCell(Cell item, NSView reusableView, NSTableView tv)
{
var tvc = reusableView as CellNSView ?? new CellNSView(NSTableViewCellStyle.ImageSubtitle);
var result = (CellNSView)base.GetCell(item, tvc, tv);
var imageCell = (ImageCell)item;
WireUpForceUpdateSizeRequested(item, result, tv);
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
SetImage(imageCell, result);
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
return result;
}
protected override async void HandlePropertyChanged(object sender, PropertyChangedEventArgs args)
{
var tvc = (CellNSView)sender;
var imageCell = (ImageCell)tvc.Cell;
base.HandlePropertyChanged(sender, args);
if (args.PropertyName == ImageCell.ImageSourceProperty.PropertyName)
await SetImage(imageCell, tvc);
}
static async Task SetImage(ImageCell cell, CellNSView target)
{
var source = cell.ImageSource;
target.ImageView.Image = null;
IImageSourceHandler handler;
if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null)
{
NSImage uiimage;
try
{
uiimage = await handler.LoadImageAsync(source).ConfigureAwait(false);
}
catch (TaskCanceledException)
{
uiimage = null;
}
NSRunLoop.Main.BeginInvokeOnMainThread(() =>
{
target.ImageView.Image = uiimage;
target.NeedsLayout = true;
});
}
else
target.ImageView.Image = null;
}
}
}
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