// Token: 0x06004E08 RID: 19976 RVA: 0x0015FBB4 File Offset: 0x0015DDB4
private static void OnExpanded(object sender, RoutedEventArgs e)
{
GroupItem groupItem = sender as GroupItem;
if (groupItem != null && groupItem._expander != null && groupItem._expander.IsExpanded)
{
ItemsControl parentItemsControl = groupItem.ParentItemsControl;
if (parentItemsControl != null && VirtualizingPanel.GetIsVirtualizing(parentItemsControl) && VirtualizingPanel.GetVirtualizationMode(parentItemsControl) == VirtualizationMode.Recycling)
{
ItemsPresenter itemsHostPresenter = groupItem.ItemsHostPresenter;
if (itemsHostPresenter != null)
{
groupItem.InvalidateMeasure();
Helper.InvalidateMeasureOnPath(itemsHostPresenter, groupItem, false);
}
}
}
}
private static void OnExpanded(object sender, RoutedEventArgs e)
{
GroupItem groupItem = sender as GroupItem;
if (groupItem != null && groupItem._expander != null && groupItem._expander.IsExpanded)
{
ItemsControl itemsControl = groupItem.ParentItemsControl;
if (itemsControl != null && VirtualizingPanel.GetIsVirtualizing(itemsControl) && VirtualizingPanel.GetVirtualizationMode(itemsControl) == VirtualizationMode.Recycling)
{
ItemsPresenter itemsHostPresenter = groupItem.ItemsHostPresenter;
if (itemsHostPresenter != null)
{
// In case a GroupItem that wasn't previously expanded is now
// recycled to represent an entity that is expanded, we face a situation
// where the ItemsHost isn't connected yet but we do need to synchronously
// remeasure the sub tree through the ItemsPresenter leading up to the
// ItemsHost panel. If we didnt do this the offsets could get skewed.
groupItem.InvalidateMeasure();
Helper.InvalidateMeasureOnPath(itemsHostPresenter, groupItem, false /*duringMeasure*/);
}
}
}
}
