internal void BringIntoViewCore(BringIntoViewOperation bringIntoViewOperation)
{
if (bringIntoViewOperation == null)
{
return;
}
if (bringIntoViewOperation.ScrollAttempts < BringIntoViewOperation.MaxScrollAttempts)
{
if (this.IsItemInViewport(bringIntoViewOperation.RequestedItem, false))
{
if (bringIntoViewOperation.CompletedAction != null)
{
bringIntoViewOperation.CompletedAction.Invoke();
}
}
else
{
this.BringIntoView(bringIntoViewOperation);
bringIntoViewOperation.ScrollAttempts++;
this.scrollUpdateService.RegisterUpdate(new DelegateUpdate(() => BringIntoViewCore(bringIntoViewOperation)));
}
}
else
{
this.UnsubscribeRendering();
}
}
public virtual void BringIntoView(object item, Action scrollCompletedAction)
{
if (!this.IsProperlyTemplated)
{
this.initialVirtualizationItem = this.listSource.FindItem(item);
return;
}
var bringIntoViewOperation = new BringIntoViewOperation(item)
{
CompletedAction = scrollCompletedAction
};
this.BringIntoViewCore(bringIntoViewOperation);
}
internal virtual void BringIntoView(BringIntoViewOperation bringIntoViewOperation)
{
////Check whether the item to bring into view is already realized
RadVirtualizingDataControlItem foundItem = null;
foreach (RadVirtualizingDataControlItem uiItem in this.realizedItems)
{
if (object.Equals(uiItem.associatedDataItem.Value, bringIntoViewOperation.RequestedItem))
{
foundItem = uiItem;
break;
}
}
////If the item is not realized, recycle all items and start realizing from the pivot item (the one we should bring into view).
if (foundItem == null)
{
this.initialVirtualizationItem = this.listSource.FindItem(bringIntoViewOperation.RequestedItem);
if (this.initialVirtualizationItem == null)
{
throw new ArgumentException("Specified item does not exist in the Items Source.");
}
this.RecycleAllItems();
this.ApplyScrollOffsetForItem(this.initialVirtualizationItem);
this.BeginAsyncBalance();
}
else
{
////If the item is realized, calculate the smallest amount that the item can be offset so that it is fully visible in the viewport.
double offset = this.GetRealizedItemBringIntoViewOffset(foundItem);
this.virtualizationStrategy.ScrollToOffset(this.virtualizationStrategy.ScrollOffset + offset, () =>
{
////Perform a balance to ensure that all buffers are filled.
this.SubscribeRendering();
this.BalanceVisualSpace();
});
}
}
