private void NodeExpanded(DiagramNode sender, RoutedEventArgs eventArguments)
{
rootNode.Location = new Point(
(double)GetValue(Canvas.ActualWidthProperty) / 2.0,
(double)GetValue(Canvas.ActualHeightProperty) / 2.0);
MakeChildrenVisible(sender);
if (sender.DiagramParent != null)
{
sender.DiagramParent.Visibility = Visibility.Visible;
foreach (DiagramNode sibling in sender.DiagramParent.DiagramChildren)
{
if (sibling != sender)
{
sibling.Visibility = Visibility.Collapsed;
}
}
if (sender.DiagramParent.DiagramParent != null)
{
sender.DiagramParent.DiagramParent.Visibility = Visibility.Collapsed;
}
}
if (sender.DiagramChildren.Count > 0)
{
double startAngle = CalculateStartAngle(sender);
double angleBetweenChildren = (sender == rootNode ? Math.PI * 2.0 : Math.PI) / ((double)sender.DiagramChildren.Count - 0);
double legDistance = CalculateLegDistance(sender, angleBetweenChildren);
for (int i = 0; i < sender.DiagramChildren.Count; ++i)
{
DiagramNode child = sender.DiagramChildren[i];
child.Selected += new NodeStateChangedHandler(NodeSelected);
child.Expanded += new NodeStateChangedHandler(NodeExpanded);
child.Collapsed += new NodeStateChangedHandler(NodeCollapsed);
Point parentLocation = sender.Location;
child.Location = new Point(
parentLocation.X + Math.Cos(startAngle + angleBetweenChildren * (double)i) * legDistance,
parentLocation.Y + Math.Sin(startAngle + angleBetweenChildren * (double)i) * legDistance);
foreach (DiagramNode childsChild in child.DiagramChildren)
{
childsChild.Visibility = Visibility.Collapsed;
}
}
}
BaseCanvas.InvalidateArrange();
BaseCanvas.UpdateLayout();
BaseCanvas.InvalidateVisual();
}
private void NodeCollapsed(DiagramNode sender, RoutedEventArgs eventArguments)
{
foreach (DiagramNode child in sender.DiagramChildren)
{
child.Visibility = Visibility.Collapsed;
foreach (DiagramNode grandChildren in child.DiagramChildren)
{
grandChildren.Visibility = Visibility.Collapsed;
}
}
BaseCanvas.InvalidateArrange();
BaseCanvas.UpdateLayout();
BaseCanvas.InvalidateVisual();
}
private void MakeChildrenVisible(DiagramNode sender)
{
foreach (DiagramNode child in sender.DiagramChildren)
{
if (!BaseCanvas.Children.Contains(child))
{
BaseCanvas.Children.Add(child);
}
else
{
child.Visibility = Visibility.Visible;
}
}
BaseCanvas.InvalidateArrange();
BaseCanvas.UpdateLayout();
BaseCanvas.InvalidateVisual();
}