private void OnTreeViewItemParentChanged(object sender, ParentChangedEventArgs e)
{
TreeViewItem tvItem = (TreeViewItem)sender;
if (!CanHandleEvent(tvItem))
{
return;
}
TreeViewItem oldParent = e.OldParent;
if (DropMarker.Action != ItemDropAction.SetLastChild && DropMarker.Action != ItemDropAction.None)
{
if (oldParent != null && !oldParent.HasChildren)
{
oldParent.CanExpand = false;
}
return;
}
TreeViewItem tvDropTarget = e.NewParent;
if (tvDropTarget != null)
{
if (tvDropTarget.CanExpand)
{
tvDropTarget.IsExpanded = true;
}
else
{
tvDropTarget.CanExpand = true;
try
{
m_expandSilently = true;
tvDropTarget.IsExpanded = true;
}
finally
{
m_expandSilently = false;
}
}
}
TreeViewItem dragItemChild = tvItem.FirstChild();
TreeViewItem lastChild = null;
if (tvDropTarget != null)
{
lastChild = tvDropTarget.LastChild();
if (lastChild == null)
{
lastChild = tvDropTarget;
}
}
else
{
lastChild = (TreeViewItem)LastItemContainer();
}
if (lastChild != tvItem)
{
TreeViewItem lastDescendant = lastChild.LastDescendant();
if (lastDescendant != null)
{
lastChild = lastDescendant;
}
if (!lastChild.IsDescendantOf(tvItem))
{
base.SetNextSibling(lastChild, tvItem);
}
}
if (dragItemChild != null)
{
MoveSubtree(tvItem, dragItemChild);
}
if (oldParent != null && !oldParent.HasChildren)
{
oldParent.CanExpand = false;
}
}
private void OnTreeViewItemParentChanged(object sender, ParentChangedEventArgs e)
{
TreeViewItem treeViewItem1 = (TreeViewItem)sender;
if (!this.CanHandleEvent((object)treeViewItem1))
{
return;
}
TreeViewItem oldParent = e.OldParent;
if (this.DropMarker.Action != ItemDropAction.SetLastChild && this.DropMarker.Action != ItemDropAction.None)
{
if (!Object.op_Inequality((Object)oldParent, (Object)null) || oldParent.HasChildren)
{
return;
}
oldParent.CanExpand = false;
}
else
{
TreeViewItem newParent = e.NewParent;
if (Object.op_Inequality((Object)newParent, (Object)null))
{
if (newParent.CanExpand)
{
newParent.IsExpanded = true;
}
else
{
newParent.CanExpand = true;
try
{
this.m_expandSilently = true;
newParent.IsExpanded = true;
}
finally
{
this.m_expandSilently = false;
}
}
}
TreeViewItem child = treeViewItem1.FirstChild();
TreeViewItem treeViewItem2;
if (Object.op_Inequality((Object)newParent, (Object)null))
{
treeViewItem2 = newParent.LastChild();
if (Object.op_Equality((Object)treeViewItem2, (Object)null))
{
treeViewItem2 = newParent;
}
}
else
{
treeViewItem2 = (TreeViewItem)this.LastItemContainer();
}
if (Object.op_Inequality((Object)treeViewItem2, (Object)treeViewItem1))
{
TreeViewItem treeViewItem3 = treeViewItem2.LastDescendant();
if (Object.op_Inequality((Object)treeViewItem3, (Object)null))
{
treeViewItem2 = treeViewItem3;
}
if (!treeViewItem2.IsDescendantOf(treeViewItem1))
{
base.SetNextSibling((ItemContainer)treeViewItem2, (ItemContainer)treeViewItem1);
}
}
if (Object.op_Inequality((Object)child, (Object)null))
{
this.MoveSubtree(treeViewItem1, child);
}
if (!Object.op_Inequality((Object)oldParent, (Object)null) || oldParent.HasChildren)
{
return;
}
oldParent.CanExpand = false;
}
}