package  utils;

 import  javax.swing.*;
 import  java.awt.event.*;
 import  java.util.Vector;

 public   class  comboFilter  extends  JComboBox {
    model oModel =  new  model();

     public  comboFilter() {
         this .setModel(oModel);
         this .setEditable(true);

         this .getEditor().getEditorComponent().addKeyListener((KeyListener)  new  KeyAdapter() {
             public   void  keyReleased(KeyEvent e) {

                 if  (e.getKeyCode() == KeyEvent.VK_UP | e.getKeyCode() == KeyEvent.VK_DOWN) {
                    comboFilter. this .getEditor().setItem(oModel.getSelectedItem());
                     return ;
                }

                String s = (String) comboFilter. this .getEditor().getItem();
                oModel.setSelectedItem(s);
                oModel.setFilter((String) comboFilter. this .getEditor().getItem());

                hidePopup();//для перерасчёта высоты попап-меню.
                showPopup();
            }
        });
    }

     void  setValue(Vector val) {
        oModel.vsrc = val;
        oModel.setFilter("");
    }


     class  model  extends  AbstractListModel  implements  ComboBoxModel {
        Object selectItem;
        String filter = "";

         public   void  setSelectedItem(Object anItem) {
             this .selectItem = anItem;
        }

         public  Object getSelectedItem() {
             return  selectItem;
        }

        //////////////////////////////////////////////////////////

        Vector vsrc =  new  Vector();
        Vector v =  new  Vector();

         public   int  getSize() {
             return  v.size();
        }
        
         public  Object getElementAt( int  index) {
             return  v.get(index);
        }
        //выставляем фильтр и фильтруем содержание
         public   void  setFilter(String s) {
             if  (s ==  null ) filter = "";
             else  filter = s;

            v.removeAllElements();
             for  ( int  q =  0 ; q < vsrc.size(); q++) {
                 if  (vsrc.get(q) ==  null )  continue ;
                String src = vsrc.get(q).toString();
                 if  (src ==  null )  continue ;
                 if  (src.startsWith(filter))
                    v.add(vsrc.get(q));
            }

             this .fireContentsChanged( this ,  0 , vsrc.size());
        }
    }

     public   static   void  main(String arg[]) {
        comboFilter combo =  new  comboFilter();
        JFrame fr =  new  JFrame();
        fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        
        fr.setContentPane(combo);
        fr.pack();
        fr.setVisible(true);

        Vector v =  new  Vector();
        v.add("1");
        v.add("a");
        v.add("abc");
        v.add("asd");
        v.add("agb");
        v.add("ash");
        v.add("asdv");

        combo.setValue(v);
    }
}