// Update the metrics of this node.
public override void UpdateMetrics(TextLayout layout, bool force)
{
if(force || !valid)
{
// clear the metrics information
size = Size.Empty;
// get the first child of this group
TextNode child = first;
// update child metrics and add to group's metrics
while(child != null)
{
// update the child's metrics information
child.UpdateMetrics(layout, force);
// add the metrics information
size = layout.AddMetrics(size, child.size);
// move to the next child
child = child.next;
}
// flag that the metrics information is now valid
valid = true;
}
}
