private void SetIndent(TreeViewItem parent, ref int siblingIndex)
{
while(true)
{
TreeViewItem child = (TreeViewItem)m_treeView.GetItemContainer(siblingIndex + 1);
if(child == null)
{
return;
}
if(child.Parent != parent)
{
return;
}
child.m_indent = parent.m_indent + m_treeView.Indent;
child.m_itemLayout.padding.left = child.m_indent;
siblingIndex++;
SetIndent(child, ref siblingIndex);
}
}
/// <summary>
/// Get Next Child Of TreeViewItem
/// </summary>
/// <param name="currentChild"></param>
/// <returns>next treeview item after current child</returns>
public TreeViewItem NextChild(TreeViewItem currentChild)
{
if(currentChild == null)
{
throw new ArgumentNullException("currentChild");
}
int siblingIndex = currentChild.transform.GetSiblingIndex();
siblingIndex++;
TreeViewItem nextChild = (TreeViewItem)m_treeView.GetItemContainer(siblingIndex);
while(nextChild != null && nextChild.IsDescendantOf(this))
{
if(nextChild.Parent == this)
{
return nextChild;
}
siblingIndex++;
nextChild = (TreeViewItem)m_treeView.GetItemContainer(siblingIndex);
}
return null;
}
/// <summary>
/// Is treeviewitem is descendant of another element
/// </summary>
/// <param name="ancestor">treeview item to test</param>
/// <returns>true if treeview item is descendant of ancestor</returns>
public bool IsDescendantOf(TreeViewItem ancestor)
{
if (ancestor == null)
{
return true;
}
if(ancestor == this)
{
return false;
}
TreeViewItem testItem = this;
while (testItem != null)
{
if (ancestor == testItem)
{
return true;
}
testItem = testItem.Parent;
}
return false;
}
public ParentChangedEventArgs(TreeViewItem oldParent, TreeViewItem newParent)
{
OldParent = oldParent;
NewParent = newParent;
}
public ParentChangedEventArgs(TreeViewItem oldParent, TreeViewItem newParent)
{
OldParent = oldParent;
NewParent = newParent;
}
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;
m_expandSilently = true;
tvDropTarget.IsExpanded = true;
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))
{
DropItemAfter(lastChild, tvItem);
}
}
if (dragItemChild != null)
{
MoveSubtree(tvItem, dragItemChild);
}
if (oldParent != null && !oldParent.HasChildren)
{
oldParent.CanExpand = false;
}
}
