gistfile1.txt

- (CPDragOperation)draggingEntered:(id)sender
{
    if(_delegate && [_delegate respondsToSelector:@selector(collectionView:validateDrop:)]) {
        return [_delegate collectionView:self validateDrop:sender];
    }
    
    return CPDragOperationNone;
}

/*
    @ignore
*/
- (BOOL)performDragOperation:(id)sender
{
    return [_delegate collectionView:self acceptDrop:sender];
}

/*
    @ignore
*/
- (void)concludeDragOperation:(id)sender
{
    [self reloadContent];
}