NumberLabelGroup Class

The NumberLabelGroup class provides a mechanism for exclusive selection among a set of NumberLabel objects. If a NumberLabel object belongs to a NumberLabelGroup, then the NumberLabel invokes the NumberLabelGroup select() and unselect() methods as appropriate. The curNL() method returns the currently selected NumberLabel, or null if none are selected.

package MyAwt;

import java.awt.*;

public class NumberLabelGroup extends Object {

   private NumberLabel p_curNL=null;

   public void select(NumberLabel numberLabel) {
      if (p_curNL!=null && p_curNL!=numberLabel)
         p_curNL.selected(false);
      p_curNL=numberLabel;
   }

   public void unselect(NumberLabel numberLabel) {
      if (p_curNL==numberLabel)
         p_curNL=null;
   }

   public NumberLabel curNL() { return p_curNL; }

}