帶有自動檢查功能的CombBox

package com.test;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.util.List;

import java.util.Vector;

import javax.swing.ComboBoxModel;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JTextField;

import java.util.Collections;

import java.util.Arrays;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JOptionPane;

public class JAutoCompleteComboBox

    extends JComboBox {

private AutoCompleter completer;

public JAutoCompleteComboBox() {

    super();

    addCompleter();

}

public JAutoCompleteComboBox(ComboBoxModel cm) {

    super(cm);

    addCompleter();

}

public JAutoCompleteComboBox(Object[] items) {

    super(items);

    addCompleter();

}

public JAutoCompleteComboBox(List v) {

    super( (Vector) v);

    addCompleter();

}

private void addCompleter() {

    setEditable(true);

    completer = new AutoCompleter(this);

}

public void autoComplete(String str) {

    this.completer.autoComplete(str, str.length());

}

public String getText() {

    return ( (JTextField) getEditor().getEditorComponent()).getText();

}

public void setText(String text) {

    ( (JTextField) getEditor().getEditorComponent()).setText(text);

}

public boolean containsItem(String itemString) {

    for (int i = 0; i < this.getModel().getSize(); i++) {

      String _item = "" + this.getModel().getElementAt(i);

      if (_item.equals(itemString)) {

        return true;

      }

    }

    return false;

}

public static void main(String[] args) {

    JFrame frame = new JFrame();

    Object[] items = new Object[] {

        "http://baidu.com/jb/pie","http://yahoo.com","http://www.sina.com.cn/blog/trunk","http://www.1263.com.cn/blog/trunk", "http://www.8866.com.cn/blog/trunk","http://www.sina.com.cn/blog/trunk","http://www.sina.com.cn/blog/trunk", "http://www.sina.com.cn/blog/trunk", "http://www.sina.com.cn/blog/trunk", "http://www.sina.com.cn/blog/trunk"};

    //排序内容

    //java.util.ArrayList list = new java.util.ArrayList(Arrays.asList(items));

    //Collections.sort(list);

    //JComboBox cmb = new JAutoCompleteComboBox(list.toArray());

    Arrays.sort(items);

    JComboBox cmb = new JAutoCompleteComboBox(items);

    cmb.setSelectedIndex(-1);

    cmb.setSize(800, 80);

    frame.getContentPane().add(cmb);

    frame.setSize(400, 80);

    frame.setVisible(true);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

class AutoCompleter

    implements KeyListener, ItemListener {

private JComboBox owner = null;

private JTextField editor = null;

private ComboBoxModel model = null;

public AutoCompleter(JComboBox comboBox) {

    owner = comboBox;

    editor = (JTextField) comboBox.getEditor().getEditorComponent();

    editor.addKeyListener(this);

    model = comboBox.getModel();

    owner.addItemListener(this);

}

public void keyTyped(KeyEvent e) {}

public void keyPressed(KeyEvent e) {}

public void keyReleased(KeyEvent e) {

    char ch = e.getKeyChar();

    if (ch == KeyEvent.CHAR_UNDEFINED || Character.isISOControl(ch) ||

        ch == KeyEvent.VK_DELETE) {

      return;

    }

    int caretPosition = editor.getCaretPosition();

    String str = editor.getText();

    if (str.length() == 0) {

      return;

    }

    autoComplete(str, caretPosition);

}

protected void autoComplete(String strf, int caretPosition) {

    Object[] opts;

    opts = getMatchingOptions(strf.substring(0, caretPosition));

    if (owner != null) {

      model = new DefaultComboBoxModel(opts);

      owner.setModel(model);

    }

    if (opts.length > 0) {

      String str = opts[0].toString();

      if(caretPosition>editor.getText().length()) return;

      editor.setCaretPosition(caretPosition);

      editor.setText(editor.getText().trim().substring(0,caretPosition));

      if (owner != null) {

        try {

          owner.showPopup();

        }

        catch (Exception ex) {

          ex.printStackTrace();

        }

      }

    }

}

protected Object[] getMatchingOptions(String str) {

    List v = new Vector();

    List v1 = new Vector();

    for (int k = 0; k < model.getSize(); k++) {

      Object itemObj = model.getElementAt(k);

      if (itemObj != null) {

        String item = itemObj.toString().toLowerCase();

        if (item.startsWith(str.toLowerCase())) {

          v.add(model.getElementAt(k));

        }

        else {

          v1.add(model.getElementAt(k));

        }

      }

      else {

        v1.add(model.getElementAt(k));

      }

    }

    for (int i = 0; i < v1.size(); i++) {

      v.add(v1.get(i));

    }

    if (v.isEmpty()) {

      v.add(str);

    }

    return v.toArray();

}

public void itemStateChanged(ItemEvent event) {

    if (event.getStateChange() == ItemEvent.SELECTED) {

      int caretPosition = editor.getCaretPosition();

      if (caretPosition != -1) {

        try {

          editor.moveCaretPosition(caretPosition);

        }

        catch (IllegalArgumentException ex) {

          ex.printStackTrace();

        }

      }

    }

}

}