How can I add "..." to GUI.Label if it goes past its bounds?

I made this a while ago, not sure its particularly efficient but it appears to do the job!

 var myString : String;
 private var tempString : String;
 private var stringSize : Vector2;
 var labelWidth = 100;
 
 function Start () {
     if(labelWidth < 15){
         labelWidth = 15;
     }
 }
 
 function OnGUI () {
     myString = GUI.TextField(Rect(10, 10, 300, 20), myString);
     stringSize = GUI.skin.GetStyle("Box").CalcSize(GUIContent(myString));
     
     if(stringSize.x > labelWidth){
         CalcSubstring();
         GUI.Label(Rect(10, 40, labelWidth, 20), tempString + "...");
     }else{
         GUI.Label(Rect(10, 40, labelWidth, 20), myString);
     }
 }
 
 function CalcSubstring () {
     tempString = myString;
     while(GUI.skin.GetStyle("Box").CalcSize(GUIContent(tempString)).x > labelWidth-8){
         tempString = tempString.Substring(0, tempString.Length - 1);
     }
 }

Scribe

P.S

please include a description of your problem in future