public GalleryCategories(IRibbonControl ribbonControl, IUICollection fromGallery)
{
if (ribbonControl == null)
{
throw new ArgumentNullException(nameof(ribbonControl));
}
_ribbonControl = ribbonControl;
if (fromGallery == null)
{
throw new ArgumentException(ribbonControl.ToString() + " not initialized");
}
_collectionChanged = new UICollectionChangedEvent();
_collectionChanged.ChangedEvent += CollectionChanged_ChangedEvent;
_collectionChanged.Attach(fromGallery);
uint count;
object item;
fromGallery.GetCount(out count);
for (uint i = 0; i < count; i++)
{
fromGallery.GetItem(i, out item);
GalleryItemPropertySet galleryItem = GetItemPropertySet(item);
_controlItems.Add(galleryItem);
}
}