async Task DownloadImages()
{
if (DownloadedImages.Count >= LoadedWork.PageCount)
{
return;
}
var lworkid = LoadedWork.Id;
using (await locker.LockAsync())
{
try
{
if (lworkid != LoadedWork.Id)
{
return;
}
SetProgressBar(true);
for (int i = 0; i < LoadedWork.PageCount; i++)
{
// if page is not yet downloaded, download it
ImageSource dimg = null;
var page = DownloadedImages.Find(x => x.Page == i + 1);
if (page == null)
{
// start downloading it - befor and after download - check if work has been switched
if (isClosing || lworkid != LoadedWork.Id)
{
break;
}
dimg = await Task.Run(() => PixivWork.GetImage(LoadedWork.GetImageUri(LoadedWork.OriginalImageUrl, i)));
if (isClosing || lworkid != LoadedWork.Id)
{
break;
}
}
else
{
dimg = page.ImageData;
}
// cache image and update status
var dwImage = new DownloadedImageData(i + 1, dimg);
DownloadedImages.Add(dwImage);
CacheDownloads(lworkid.Value, dwImage);
SetPageStatus();
ImageDownloaded?.Invoke(this, dimg);
}
}
finally
{
isClosing = false;
SetProgressBar(false);
}
}
}
void CacheDownloads(long wrkId, DownloadedImageData img) => PreviousDownloadsCache.Add(new Tuple <long, DownloadedImageData>(wrkId, img), x => x.Item1 == wrkId && x.Item2.Page == img.Page);
