void MakeThumbnail(Book.Book book, int height, Control invokeTarget)
{
bool done = false;
string error = null;
HtmlThumbNailer.ThumbnailOptions options = new HtmlThumbNailer.ThumbnailOptions()
{
CenterImageUsingTransparentPadding = false,
//since this is destined for HTML, it's much easier to handle if there is no pre-padding
Height = height,
Width = -1,
FileName = "thumbnail-" + height + ".png"
};
book.RebuildThumbNailAsync(options, (info, image) => done = true,
(info, ex) =>
{
done = true;
throw ex;
});
var giveUpTime = DateTime.Now.AddSeconds(15);
while (!done && DateTime.Now < giveUpTime)
{
Thread.Sleep(100);
Application.DoEvents();
// In the context of bulk upload, when a model dialog is the only window, apparently Application.Idle is never invoked.
// So we need a trick to allow the thumbnailer to actually make some progress, since it usually works while idle.
this._htmlThumbnailer.Advance(invokeTarget);
}
if (!done)
{
throw new ApplicationException(string.Format("Gave up waiting for the {0} to be created. This usually means Bloom is busy making thumbnails for other things. Wait a bit, and try again.", options.FileName));
}
}
public void UpdateThumbnailAsync(Book.Book book, HtmlThumbNailer.ThumbnailOptions thumbnailOptions, Action <Book.BookInfo, Image> callback, Action <Book.BookInfo, Exception> errorCallback)
{
book.RebuildThumbNailAsync(thumbnailOptions, callback, errorCallback);
}
