protected override void SetDataContext(object item)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
// When TableflowViewItemsHost is used and an EmptyDataItem is detected. We also want to avoid getting an animation when the container is sticky
if (!(item is EmptyDataItem) &&
(dataGridContext != null) &&
(dataGridContext.DataGridControl.GetView() is TableflowView) &&
!(TableflowViewItemsHost.GetIsSticky(this)) &&
TableflowViewItemsHost.GetShouldDelayDataContext(this))
{
this.ApplyAnimationClock(Row.CellContentOpacityProperty, null);
this.SetValue(Row.CellContentOpacityProperty, 0d);
// We set the DataContext to an EmptyDataItem to have the real data item set later on with an opacity animation.
this.DataContext = this.EmptyDataItem;
this.UpdateUnboundDataItemContext();
// Dispatch a call to SetDataContextDispatched that will update the DataContext of the Row and every CreatedCells to the
// DataItem the Row must display. We use a low priority to limit the impact on scrolling.
if (m_affectDataContextOperation == null)
{
m_affectDataContextOperation = this.Dispatcher.BeginInvoke(new Action <object>(this.SetDataContextDispatched), DispatcherPriority.Background, item);
}
}
else
{
this.DataContext = item;
this.UpdateUnboundDataItemContext();
this.ApplyAnimationClock(Row.CellContentOpacityProperty, null);
this.ClearValue(Row.CellContentOpacityProperty);
}
}
internal static bool IsDataItemHiddenBySticky( DataGridContext dataGridContext, object tempValue )
{
// We only want to do special handling for a TableflowItemsHost.
TableflowViewItemsHost itemsHost = dataGridContext.DataGridControl.ItemsHost as TableflowViewItemsHost;
if( itemsHost == null )
return false;
int index = dataGridContext.CustomItemContainerGenerator.FindIndexForItem( tempValue, dataGridContext );
if( index > -1 )
{
return itemsHost.IsDataItemHiddenBySticky( index );
}
return false;
}
internal ItemContextVisitor(TableflowViewItemsHost itemsHost, double firstItemHiddenRatio)
{
m_itemsHost = itemsHost;
m_firstItemHiddenRatio = firstItemHiddenRatio;
}
