Small Cell Combobox Example : ComboBox « Swing Components « Java

Small Cell Combobox Example

Small Cell Combobox Example
// Example from
/* (swing1.1) */

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.event.ListDataEvent;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.plaf.basic.ComboPopup;
import javax.swing.plaf.metal.MetalComboBoxUI;
import javax.swing.table.DefaultTableModel;

 * @version 1.0 3/06/99
public class SmallCellComboExample extends JFrame {

  public SmallCellComboExample() {
    super("SmallCell Combo Example");

    DefaultTableModel dm = new DefaultTableModel(4, 10) {
      public void setValueAt(Object obj, int row, int col) {
        if (obj != null) {
          String str;
          if (obj instanceof String) {
            str = ((String) obj).substring(0, 2);
          } else {
            str = obj.toString();
          super.setValueAt(str, row, col);
    JTable table = new JTable(dm);

    String[] str = { "010 - To Time", "020 - Vacation", "030 - Feel Bad" };

    SteppedComboBox combo = new SteppedComboBox(str) {
      public void contentsChanged(ListDataEvent e) {
        selectedItemReminder = null;

    Dimension d = combo.getPreferredSize();

    DefaultCellEditor editor = new DefaultCellEditor(combo);
    table.setDefaultEditor(Object.class, editor);

    JScrollPane scroll = new JScrollPane(table);
    getContentPane().add(scroll, BorderLayout.CENTER);

  public static void main(String[] args) {
    SmallCellComboExample frame = new SmallCellComboExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
    frame.setSize(300, 120);

 * @version 1.0 12/12/98

class SteppedComboBoxUI extends MetalComboBoxUI {
  protected ComboPopup createPopup() {
    BasicComboPopup popup = new BasicComboPopup(comboBox) {

      public void show() {
        Dimension popupSize = ((SteppedComboBox) comboBox)
        Rectangle popupBounds = computePopupBounds(0, comboBox
            .getBounds().height, popupSize.width, popupSize.height);
        int selectedIndex = comboBox.getSelectedIndex();
        if (selectedIndex == -1) {
        } else {

        show(comboBox, popupBounds.x, popupBounds.y);
    return popup;

class SteppedComboBox extends JComboBox {
  protected int popupWidth;

  public SteppedComboBox(ComboBoxModel aModel) {
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;

  public SteppedComboBox(final Object[] items) {
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;

  public SteppedComboBox(Vector items) {
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;

  public void setPopupWidth(int width) {
    popupWidth = width;

  public Dimension getPopupSize() {
    Dimension size = getSize();
    if (popupWidth < 1)
      popupWidth = size.width;
    return new Dimension(popupWidth, size.height);


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