/// <summary>
/// Determines whether the specified data item is currently visible.
/// </summary>
/// <param name="dataItem"></param>
/// <param name="includePartiallyVisibleItems">
/// If this parameter is set to <c>true</c>, then the partially visible items will also be included.
/// </param>
public bool IsItemInViewport(object dataItem, bool includePartiallyVisibleItems = true)
{
if (!this.IsOperational())
{
return(false);
}
RadVirtualizingDataControlItem container = this.virtualizationStrategy.GetTopVisibleContainer();
int iterationStart = container.associatedDataItem.Index - this.firstItemCache.associatedDataItem.Index;
double bottomViewportEdge = this.virtualizationStrategy.ViewportLength;
for (int i = iterationStart; i < this.realizedItems.Count; i++)
{
container = this.realizedItems[i];
var itemTop = this.virtualizationStrategy.GetItemRelativeOffset(container);
if (itemTop < bottomViewportEdge)
{
if (!includePartiallyVisibleItems && (itemTop < 0 || itemTop + virtualizationStrategy.GetItemLength(container) > bottomViewportEdge))
{
continue;
}
if (dataItem.Equals(container.associatedDataItem.Value) && container.Visibility == Visibility.Visible)
{
return(true);
}
}
else
{
break;
}
}
return(false);
}
