public LoadThumbnailResult(ThumbnailDescriptor descriptor, Exception error)
{
Platform.CheckForNullReference(descriptor, "descriptor");
Platform.CheckForNullReference(error, "error");
Descriptor = descriptor;
Error = error;
}
public LoadThumbnailResult(ThumbnailDescriptor descriptor, IImageData thumbnailData, Size size)
{
Platform.CheckForNullReference(descriptor, "descriptor");
Platform.CheckForNullReference(thumbnailData, "thumbnailData");
Size = size;
Descriptor = descriptor;
ThumbnailData = thumbnailData;
}
public LoadThumbnailRequest(ThumbnailDescriptor descriptor, Size size, Action <LoadThumbnailResult> resultCallback)
{
Platform.CheckForNullReference(descriptor, "descriptor");
Platform.CheckForNullReference(resultCallback, "resultCallback");
Descriptor = descriptor;
Size = size;
ResultCallback = resultCallback;
}
private void UpdateImage()
{
if (_isImageLoaded || ThumbnailSize.IsEmpty)
{
return;
}
var descriptor = ThumbnailDescriptor.Create((IDisplaySet)Item, true);
if (descriptor == null)
{
if (!_isImageValid)
{
ImageData = Loader.GetDummyThumbnail(_factory.NoImagesMessage, _thumbnailSize);
_isImageValid = true;
}
}
else
{
IImageData imageData;
if (!_isImageValid && Loader.TryGetThumbnail(descriptor, _thumbnailSize, out imageData))
{
ImageData = imageData;
_isImageValid = _isImageLoaded = true;
}
else
{
if (!_isImageValid)
{
ImageData = Loader.GetDummyThumbnail(_factory.LoadingMessage, _thumbnailSize);
_isImageValid = true;
}
Loader.LoadThumbnailAsync(new LoadThumbnailRequest(descriptor, _thumbnailSize, OnThumbnailLoadedAsync));
}
}
}
public override IImageData GetThumbnail(ThumbnailDescriptor descriptor, Size size)
{
return(_factory.CreateImage(descriptor.ReferenceImage, size));
}
public override bool TryGetThumbnail(ThumbnailDescriptor descriptor, Size size, out IImageData thumbnail)
{
thumbnail = null;
return(false);
}
public abstract IImageData GetThumbnail(ThumbnailDescriptor descriptor, Size size);
public abstract bool TryGetThumbnail(ThumbnailDescriptor descriptor, Size size, out IImageData thumbnail);
public bool TryGetThumbnail(ThumbnailDescriptor descriptor, Size size, out IImageData bitmap)
{
return(_repository.TryGetThumbnail(descriptor, size, out bitmap));
}