public int GetElementIndex(VirtualizationInfo virtInfo)
{
if (virtInfo == null)
{
throw new ArgumentNullException(nameof(virtInfo), "Element is not a child of this ItemsRepeater.");
}
return(virtInfo.IsRealized || virtInfo.IsInUniqueIdResetPool ? virtInfo.Index : -1);
}
private void UpdateElementIndex(UIElement element, VirtualizationInfo virtInfo, int index)
{
var oldIndex = virtInfo.Index;
if (oldIndex != index)
{
virtInfo.UpdateIndex(index);
m_owner.OnElementIndexChanged(element, oldIndex, index);
}
}
private bool ClearElementToUniqueIdResetPool(UIElement element, VirtualizationInfo virtInfo)
{
if (m_isDataSourceStableResetPending)
{
m_resetPool.Add(element);
virtInfo.MoveOwnershipToUniqueIdResetPoolFromLayout();
}
return(m_isDataSourceStableResetPending);
}
public int GetElementIndex(VirtualizationInfo virtInfo)
{
if (virtInfo == null)
{
//Element is not a child of this ItemsRepeater.
return(-1);
}
return(virtInfo.IsRealized || virtInfo.IsInUniqueIdResetPool ? virtInfo.Index : -1);
}
private bool ClearElementToPinnedPool(UIElement element, VirtualizationInfo virtInfo, bool isClearedDueToCollectionChange)
{
bool moveToPinnedPool =
!isClearedDueToCollectionChange && virtInfo.IsPinned;
if (moveToPinnedPool)
{
# if DEBUG
for (int i = 0; i < m_pinnedPool.Count; ++i)
{
Debug.Assert(m_pinnedPool[i].PinnedElement != element);
}
#endif
m_pinnedPool.Add(new PinnedElementInfo(element));
virtInfo.MoveOwnershipToPinnedPool();
}
private bool ClearElementToAnimator(UIElement element, VirtualizationInfo virtInfo)
{
bool cleared = m_owner.AnimationManager.ClearElement(element);
if (cleared)
{
int clearedIndex = virtInfo.Index;
virtInfo.MoveOwnershipToAnimator();
if (m_lastFocusedElement == element)
{
// Focused element is going away. Remove the tracked last focused element
// and pick a reasonable next focus if we can find one within the layout
// realized elements.
MoveFocusFromClearedIndex(clearedIndex);
}
}
return(cleared);
}