private void OnTreeViewItemParentChanging(object sender, VirtualizingParentChangedEventArgs e)
{
if (!CanHandleEvent(sender))
{
return;
}
TreeViewItemContainerData tvItem = (TreeViewItemContainerData)sender;
TreeViewItemContainerData oldParent = e.OldParent;
if (DropMarker.Action != ItemDropAction.SetLastChild && DropMarker.Action != ItemDropAction.None)
{
if (oldParent != null && !oldParent.HasChildren(this))
{
VirtualizingTreeViewItem tvOldParent = (VirtualizingTreeViewItem)GetItemContainer(oldParent.Item);
if (tvOldParent != null)
{
tvOldParent.CanExpand = false;
}
else
{
oldParent.CanExpand = false;
}
}
return;
}
TreeViewItemContainerData tvDropTargetData = e.NewParent;
VirtualizingTreeViewItem tvDropTarget = null;
if (tvDropTargetData != null)
{
tvDropTarget = (VirtualizingTreeViewItem)GetItemContainer(tvDropTargetData.Item);
}
if (tvDropTarget != null)
{
if (tvDropTarget.CanExpand)
{
tvDropTarget.IsExpanded = true;
}
else
{
tvDropTarget.CanExpand = true;
try
{
m_expandSilently = true;
tvDropTarget.IsExpanded = true;
}
finally
{
m_expandSilently = false;
}
}
}
else
{
if (tvDropTargetData != null)
{
tvDropTargetData.CanExpand = true;
tvDropTargetData.IsExpanded = true;
}
}
TreeViewItemContainerData dragItemChild = tvItem.FirstChild(this);
TreeViewItemContainerData lastChild = null;
if (tvDropTargetData != null)
{
lastChild = tvDropTargetData.LastChild(this);
if (lastChild == null)
{
lastChild = tvDropTargetData;
}
}
else
{
lastChild = (TreeViewItemContainerData)LastItemContainerData();
}
if (lastChild != tvItem)
{
TreeViewItemContainerData lastDescendant = lastChild.LastDescendant(this);
if (lastDescendant != null)
{
lastChild = lastDescendant;
}
if (!lastChild.IsDescendantOf(tvItem))
{
base.SetNextSiblingInternal(lastChild, tvItem);
}
}
if (dragItemChild != null)
{
MoveSubtree(tvItem, dragItemChild);
}
if (oldParent != null && !oldParent.HasChildren(this))
{
VirtualizingTreeViewItem tvOldParent = (VirtualizingTreeViewItem)GetItemContainer(oldParent.Item);
if (tvOldParent != null)
{
tvOldParent.CanExpand = false;
}
else
{
oldParent.CanExpand = false;
}
}
}
private void OnTreeViewItemParentChanged(object sender, VirtualizingParentChangedEventArgs e)
{
if (!this.CanHandleEvent(sender))
{
return;
}
TreeViewItemContainerData itemContainerData1 = (TreeViewItemContainerData)sender;
TreeViewItemContainerData oldParent = e.OldParent;
if (this.DropMarker.Action != ItemDropAction.SetLastChild && this.DropMarker.Action != ItemDropAction.None)
{
if (oldParent == null || oldParent.HasChildren(this))
{
return;
}
VirtualizingTreeViewItem itemContainer = (VirtualizingTreeViewItem)this.GetItemContainer(oldParent.Item);
if (Object.op_Inequality((Object)itemContainer, (Object)null))
{
itemContainer.CanExpand = false;
}
else
{
oldParent.CanExpand = false;
}
}
else
{
TreeViewItemContainerData newParent = e.NewParent;
VirtualizingTreeViewItem virtualizingTreeViewItem = (VirtualizingTreeViewItem)null;
if (newParent != null)
{
virtualizingTreeViewItem = (VirtualizingTreeViewItem)this.GetItemContainer(newParent.Item);
}
if (Object.op_Inequality((Object)virtualizingTreeViewItem, (Object)null))
{
if (virtualizingTreeViewItem.CanExpand)
{
virtualizingTreeViewItem.IsExpanded = true;
}
else
{
virtualizingTreeViewItem.CanExpand = true;
try
{
this.m_expandSilently = true;
virtualizingTreeViewItem.IsExpanded = true;
}
finally
{
this.m_expandSilently = false;
}
}
}
else if (newParent != null)
{
newParent.CanExpand = true;
newParent.IsExpanded = true;
}
TreeViewItemContainerData child = itemContainerData1.FirstChild(this);
TreeViewItemContainerData itemContainerData2 = newParent == null ? (TreeViewItemContainerData)this.LastItemContainerData() : newParent.LastChild(this) ?? newParent;
if (itemContainerData2 != itemContainerData1)
{
TreeViewItemContainerData itemContainerData3 = itemContainerData2.LastDescendant(this);
if (itemContainerData3 != null)
{
itemContainerData2 = itemContainerData3;
}
if (!itemContainerData2.IsDescendantOf(itemContainerData1))
{
base.SetNextSiblingInternal((ItemContainerData)itemContainerData2, (ItemContainerData)itemContainerData1);
}
}
if (child != null)
{
this.MoveSubtree(itemContainerData1, child);
}
if (oldParent == null || oldParent.HasChildren(this))
{
return;
}
VirtualizingTreeViewItem itemContainer = (VirtualizingTreeViewItem)this.GetItemContainer(oldParent.Item);
if (Object.op_Inequality((Object)itemContainer, (Object)null))
{
itemContainer.CanExpand = false;
}
else
{
oldParent.CanExpand = false;
}
}
}
