public void ComposeCell (DataItemCollectionViewCell cell, DataItem dataItem)
{
var operationQueue = OperationQueueForCell (cell);
operationQueue.CancelAllOperations ();
cell.RepresentedDataItem = dataItem;
cell.Label.Text = dataItem.Title;
cell.ImageView.Alpha = 1f;
cell.ImageView.Image = (UIImage)processedImageCache.ObjectForKey ((NSString)dataItem.Identifier);
if (cell.ImageView.Image != null)
return;
var processImageOperation = new NSBlockOperation ();
processImageOperation.AddExecutionBlock (() => {
if (processImageOperation.IsCancelled)
return;
UIImage image = null;
DispatchQueue.MainQueue.DispatchSync (() => {
image = ProcessImageNamed (dataItem.ImageName);
});
if (image == null)
return;
processedImageCache.SetObjectforKey (image, (NSString)dataItem.Identifier);
NSOperationQueue.MainQueue.AddOperation (() => {
if (cell.RepresentedDataItem == null)
return;
cell.ImageView.Alpha = 0f;
cell.ImageView.Image = image;
UIView.Animate (0.25, () => cell.ImageView.Alpha = 1f);
});
});
operationQueue.AddOperation (processImageOperation);
}
public void ConfigureWithDataItem (DataItem dataItem)
{
DataItem = dataItem;
}
public void ConfigureWithDataItems (DataItem[] dataItems)
{
this.dataItems = dataItems;
CollectionView.ReloadData ();
}