让JComboBox有自动查找和完成功能

转载：http://lyx262.iteye.com/blog/766792

package cn.edu.cuit.isi.benzeph;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.util.Arrays;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;/** * @author SamZheng 带有自动检查功能的CombBox */@SuppressWarnings("unchecked")public class JAutoCompleteComboBox extends JComboBox {private static final long serialVersionUID = 1L;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;}/* * 测试方法 */public static void main(String[] args) {JFrame frame = new JFrame();Object[] items = new Object[] { "zzz", "zba", "aab", "abc", "aab","dfg", "aba", "hpp", "pp", "hlp" };// 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);frame.getContentPane().add(cmb);frame.setSize(400, 80);frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}}/** * 自动完成器。自动找到最匹配的项目，并排在列表的最前面。 *  * @author SamZheng */@SuppressWarnings("unchecked")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);}/** * 自动完成。根据输入的内容，在列表中找到相似的项目. */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();}}}}/** *  * 找到相似的项目, 并且将之排列到数组的最前面。 *  * @param str * @return 返回所有项目的列表。 */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();}}}}}