protected void RequestImageFromSource (string source, NIPhotoScrollViewPhotoSize photoSize, int photoIndex)
{
var isThumbnail = photoSize == NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeThumbnail;
var identifier = IdentifierWithPhotoSize (photoSize, photoIndex);
var identifierKey = IdentifierKeyFromIdentifier (identifier);
// avoid duplicate requests
if (ActiveRequests.Contains (identifierKey))
return;
NSUrl url = null;
if (source.StartsWith ("http")) {
url = new NSUrl (source);
} else {
url = new NSUrl (source, true);
}
NSMutableUrlRequest request = new NSMutableUrlRequest (url);
request.TimeoutInterval = 30;
var photoIndexKey = CacheKeyForPhotoIndex (photoIndex);
var readOp = AFImageRequestOperation.ImageRequestOperationWithRequest (request, null,
(NSUrlRequest req, NSHttpUrlResponse resp, UIImage img) =>
{
// Store the image in the correct image cache.
if (isThumbnail) {
ThumbnailImageCache.StoreObject(img, photoIndexKey);
} else {
HighQualityImageCache.StoreObject(img, photoIndexKey);
}
// If you decide to move this code around then ensure that this method is called from
// the main thread. Calling it from any other thread will have undefined results.
PhotoAlbumView.DidLoadPhoto(img, photoIndex, photoSize);
if(isThumbnail) {
if(PhotoScrubberView != null)
PhotoScrubberView.DidLoadThumbnail(img, photoIndex);
}
this.ActiveRequests.Remove(identifierKey);
}, (NSUrlRequest req, NSHttpUrlResponse resp, NSError er) => {
});
readOp.ImageScale = 1;
// Set the operation priority level.
if(photoSize == NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeThumbnail)
{
readOp.QueuePriority = NSOperationQueuePriority.Low;
}else
{
readOp.QueuePriority = NSOperationQueuePriority.Normal;
}
// Start the operation.
ActiveRequests.Add(identifierKey);
Queue.AddOperation(readOp);
}
public override NSObject PhotoAlbumScrollView (NIPhotoAlbumScrollView photoAlbumScrollView, int photoIndex, out NIPhotoScrollViewPhotoSize photoSize, out bool isLoading, out SizeF originalPhotoDimensions)
{
isLoading = false;
photoSize = NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeUnknown;
UIImage image;
var photoIndexKey = _controller.CacheKeyForPhotoIndex (photoIndex);
var photo = Photos [photoIndex];
originalPhotoDimensions = photo.Dimensions;
image = (UIImage)_controller.HighQualityImageCache.ObjectWithName (photoIndexKey);
if (image != null) {
photoSize = NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeOriginal;
} else {
var source = photo.OriginalSource;
_controller.RequestImageFromSource (source, NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeOriginal, photoIndex);
isLoading = true;
// try to load the thumbnail if we can
image = (UIImage)_controller.ThumbnailImageCache.ObjectWithName (photoIndexKey);
if (image != null) {
photoSize = NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeThumbnail;
} else {
_controller.RequestImageFromSource(photo.ThumbnailSoruce, NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeThumbnail, photoIndex);
}
}
return image;
}
protected int IdentifierWithPhotoSize (NIPhotoScrollViewPhotoSize photoSize, int photoIndex)
{
var isThumbnail = photoSize == NIPhotoScrollViewPhotoSize.NIPhotoScrollViewPhotoSizeThumbnail;
return isThumbnail ? -(photoIndex + 1) : photoIndex;
}
