protected override void SetNextSibling(ItemContainer sibling, ItemContainer nextSibling)
{
TreeViewItem treeViewItem1 = (TreeViewItem)sibling;
TreeViewItem treeViewItem2 = treeViewItem1.LastDescendant();
if (Object.op_Equality((Object)treeViewItem2, (Object)null))
{
treeViewItem2 = treeViewItem1;
}
TreeViewItem parent = (TreeViewItem)nextSibling;
TreeViewItem child = parent.FirstChild();
base.SetNextSibling((ItemContainer)treeViewItem2, nextSibling);
if (Object.op_Inequality((Object)child, (Object)null))
{
this.MoveSubtree(parent, child);
}
parent.Parent = treeViewItem1.Parent;
}
protected override void SetNextSibling(ItemContainer sibling, ItemContainer nextSibling)
{
TreeViewItem tvSibling = (TreeViewItem)sibling;
TreeViewItem lastDescendant = tvSibling.LastDescendant();
if (lastDescendant == null)
{
lastDescendant = tvSibling;
}
TreeViewItem tvItem = (TreeViewItem)nextSibling;
TreeViewItem dragItemChild = tvItem.FirstChild();
base.SetNextSibling(lastDescendant, nextSibling);
if (dragItemChild != null)
{
MoveSubtree(tvItem, dragItemChild);
}
tvItem.Parent = tvSibling.Parent;
}
/// <summary>
/// Add data item as last child of parent
/// </summary>
/// <param name="parent">parent data item</param>
/// <param name="item">data item to add</param>
public void AddChild(object parent, object item)
{
if (parent == null)
{
Add(item);
}
else
{
TreeViewItem parentContainer = (TreeViewItem)GetItemContainer(parent);
if (parentContainer == null)
{
return;
}
int index = -1;
if (parentContainer.IsExpanded)
{
if (parentContainer.HasChildren)
{
TreeViewItem lastDescendant = parentContainer.LastDescendant();
index = IndexOf(lastDescendant.Item) + 1;
}
else
{
index = IndexOf(parentContainer.Item) + 1;
}
}
else
{
parentContainer.CanExpand = true;
}
if (index > -1)
{
TreeViewItem addedItem = (TreeViewItem)Insert(index, item);
addedItem.Parent = parentContainer;
}
}
}
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;
}
}
public void AddChild(object parent, object item)
{
if (parent == null)
{
this.Add(item);
}
else
{
TreeViewItem itemContainer = (TreeViewItem)this.GetItemContainer(parent);
if (Object.op_Equality((Object)itemContainer, (Object)null))
{
return;
}
int index = -1;
if (itemContainer.IsExpanded)
{
index = !itemContainer.HasChildren ? this.IndexOf(itemContainer.Item) + 1 : this.IndexOf(itemContainer.LastDescendant().Item) + 1;
}
else
{
itemContainer.CanExpand = true;
}
if (index <= -1)
{
return;
}
((TreeViewItem)this.Insert(index, item)).Parent = itemContainer;
}
}