internal void SetParent(GroupNode parent)
{
// Make sure we don't create a loop in the heirarchy structure.
IDiagramPositionable node = parent;
while (node != null)
{
if (node == this)
{
return;
}
node = node.Parent;
}
if (this.ParentNode != parent)
{
// Detach event handlers.
if (this.ParentNode != null)
{
this.ParentNode.BoundsChanged -= new EventHandler(Parent_BoundsChanged);
GroupNode group = this.ParentNode as GroupNode;
if (group != null)
{
group.IsExpandedChanged -= new EventHandler(Group_IsExpandedChanged);
group.IsVisibleChanged -= new EventHandler(Group_IsVisibleChanged);
}
}
this.ParentNode = parent; // Set the parent.
// Attach event handlers.
if (this.ParentNode != null)
{
this.ParentNode.BoundsChanged += new EventHandler(Parent_BoundsChanged);
GroupNode group = this.ParentNode as GroupNode;
if (group != null)
{
group.IsExpandedChanged += new EventHandler(Group_IsExpandedChanged);
group.IsVisibleChanged += new EventHandler(Group_IsVisibleChanged);
}
}
}
this.ParentNode.AddChild(this);
}
private void Group_IsExpandedChanged(object sender, EventArgs e)
{
GroupNode group = sender as GroupNode;
IsVisible = group.IsVisible && group.IsExpanded;
}