internal IAsyncAction LoadImageAsync(GalleryImagePlaceHolder image)
{
var pageIndex = MathHelper.GetPageIndexOfRecord(PageSize, image.PageID - 1);
var lpAc = this.loadingPageArray[pageIndex];
if (lpAc != null && lpAc.Status == AsyncStatus.Started)
{
return(lpAc);
}
return(this.loadingPageArray[pageIndex] = Run(async token =>
{
var images = (IList <GalleryImage>)await base.LoadPageAsync(pageIndex);
var offset = MathHelper.GetStartIndexOfPage(PageSize, pageIndex);
for (var i = 0; i < images.Count; i++)
{
var ph = this[i + offset] as GalleryImagePlaceHolder;
if (ph == null)
{
continue;
}
this[i + offset] = images[i];
}
await Task.Yield();
this.loadingPageArray[pageIndex] = null;
}).AsMulticast());
}
protected IAsyncOperation <IEnumerable <GalleryImage> > LoadPageLocalilyAsync(int pageIndex)
{
return(Task.Run <IEnumerable <GalleryImage> >(async() =>
{
this.LoadImageModels();
var currentPageSize = MathHelper.GetSizeOfPage(this.RecordCount, PageSize, pageIndex);
var loadList = new GalleryImage[currentPageSize];
for (var i = 0; i < currentPageSize; i++)
{
var model = this.GalleryImageModels[this.Count + i];
if (model == null)
{
loadList[i] = new GalleryImagePlaceHolder(this, this.Count + i + 1);
}
else
{
loadList[i] = await GalleryImage.LoadCachedImageAsync(this, model, model.Image);
}
}
return loadList;
}).AsAsyncOperation());
}