Here's a JComboBox that uses a JTable for it's drop-down instead of a JList. You need to give it table data (a List of Lists) instead of the usual. Sorry, there's no auto-complete.
I've been using this for years. It works, but I make no promises. Heck, there may even be some dead code in there leftover from experimentation. It's just a mish-mosh from different ideas I grabbed from different code samples over the years. I'm sure there's room for improvement.
DetailedComboBox:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.basic.*;
import javax.swing.plaf.metal.*;
import javax.swing.table.*;
/**
* A JComboBox that has a JTable as a drop-down instead of a JList
*/
public class DetailedComboBox extends JComboBox
{
public static enum Alignment {LEFT, RIGHT}
private List<List<? extends Object>> tableData;
private String[] columnNames;
private int[] columnWidths;
private int displayColumn;
private Alignment popupAlignment = Alignment.LEFT;
/**
* Construct a TableComboBox object
*/
public DetailedComboBox(String[] colNames, int[] colWidths,
int displayColumnIndex)
{
super();
this.columnNames = colNames;
this.columnWidths = colWidths;
this.displayColumn = displayColumnIndex;
setUI(new TableComboBoxUI());
setEditable(false);
}
/**
* Set the type of alignment for the popup table
*/
public void setPopupAlignment(Alignment alignment)
{
popupAlignment = alignment;
}
/**
* Populate the combobox and drop-down table with the supplied data.
* If the supplied List is non-null and non-empty, it is assumed that
* the data is a List of Lists to be used for the drop-down table.
* The combobox is also populated with the column data from the
* column defined by <code>displayColumn</code>.
*/
public void setTableData(List<List<? extends Object>> tableData)
{
this.tableData = (tableData == null ?
new ArrayList<List<? extends Object>>() : tableData);
// even though the incoming data is for the table, we must also
// populate the combobox's data, so first clear the previous list.
removeAllItems();
// then load the combobox with data from the appropriate column
Iterator<List<? extends Object>> iter = this.tableData.iterator();
while (iter.hasNext())
{
List<? extends Object> rowData = iter.next();
addItem(rowData.get(displayColumn));
}
}
public List<? extends Object> getSelectedRow()
{
return tableData.get(getSelectedIndex());
}
/**
* The handler for the combobox's components
*/
private class TableComboBoxUI extends MetalComboBoxUI
{
/**
* Create a popup component for the ComboBox
*/
@Override
protected ComboPopup createPopup()
{
return new TableComboPopup(comboBox, this);
}
/**
* Return the JList component
*/
public JList getList()
{
return listBox;
}
}
/**
* The drop-down of the combobox, which is a JTable instead of a JList.
*/
private class TableComboPopup extends BasicComboPopup
implements ListSelectionListener, ItemListener
{
private final JTable table;
private TableComboBoxUI comboBoxUI;
private PopupTableModel tableModel;
private JScrollPane scroll;
// private JList list = new JList();
// private ListSelectionListener selectionListener;
// private ItemListener itemListener;
/**
* Construct a popup component that's a table
*/
public TableComboPopup(JComboBox combo, TableComboBoxUI ui)
{
super(combo);
this.comboBoxUI = ui;
tableModel = new PopupTableModel();
table = new JTable(tableModel);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.getTableHeader().setReorderingAllowed(false);
TableColumnModel tableColumnModel = table.getColumnModel();
tableColumnModel.setColumnSelectionAllowed(false);
for (int index = 0; index < table.getColumnCount(); index++)
{
TableColumn tableColumn = tableColumnModel.getColumn(index);
tableColumn.setPreferredWidth(columnWidths[index]);
}
scroll = new JScrollPane(table);
scroll.setHorizontalScrollBarPolicy(
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
ListSelectionModel selectionModel = table.getSelectionModel();
selectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
selectionModel.addListSelectionListener(this);
combo.addItemListener(this);
table.addMouseListener(new MouseAdapter()
{
@Override
public void mousePressed(MouseEvent event)
{
Point p = event.getPoint();
int row = table.rowAtPoint(p);
comboBox.setSelectedIndex(row);
hide();
}
});
table.setBackground(UIManager.getColor("ComboBox.listBackground"));
table.setForeground(UIManager.getColor("ComboBox.listForeground"));
}
/**
* This method is overridden from BasicComboPopup
*/
@Override
public void show()
{
if (isEnabled())
{
super.removeAll();
int scrollWidth = table.getPreferredSize().width +
((Integer) UIManager.get("ScrollBar.width")).intValue() + 1;
int scrollHeight = comboBoxUI.getList().
getPreferredScrollableViewportSize().height;
scroll.setPreferredSize(new Dimension(scrollWidth, scrollHeight));
super.add(scroll);
ListSelectionModel selectionModel = table.getSelectionModel();
selectionModel.removeListSelectionListener(this);
selectRow();
selectionModel.addListSelectionListener(this);
int scrollX = 0;
int scrollY = comboBox.getBounds().height;
if (popupAlignment == Alignment.RIGHT)
{
scrollX = comboBox.getBounds().width - scrollWidth;
}
show(comboBox, scrollX, scrollY);
}
}
/**
* Implemention of ListSelectionListener
*/
public void valueChanged(ListSelectionEvent event)
{
comboBox.setSelectedIndex(table.getSelectedRow());
}
/**
* Implemention of ItemListener
*/
public void itemStateChanged(ItemEvent event)
{
if (event.getStateChange() != ItemEvent.DESELECTED)
{
ListSelectionModel selectionModel = table.getSelectionModel();
selectionModel.removeListSelectionListener(this);
selectRow();
selectionModel.addListSelectionListener(this);
}
}
/**
* Sync the selected row of the table with the selected row of the combo.
*/
private void selectRow()
{
int index = comboBox.getSelectedIndex();
if (index != -1)
{
table.setRowSelectionInterval(index, index);
table.scrollRectToVisible(table.getCellRect(index, 0, true));
}
}
}
/**
* A model for the popup table's data
*/
private class PopupTableModel extends AbstractTableModel
{
/**
* Return the # of columns in the drop-down table
*/
public int getColumnCount()
{
return columnNames.length;
}
/**
* Return the # of rows in the drop-down table
*/
public int getRowCount()
{
return tableData == null ? 0 : tableData.size();
}
/**
* Determine the value for a given cell
*/
public Object getValueAt(int row, int col)
{
if (tableData == null || tableData.size() == 0)
{
return "";
}
return tableData.get(row).get(col);
}
/**
* All cells in the drop-down table are uneditable
*/
@Override
public boolean isCellEditable(int row, int col)
{
return false;
}
/**
* Pull the column names out of the tableInfo object for the header
*/
@Override
public String getColumnName(int column)
{
String columnName = null;
if (column >= 0 && column < columnNames.length)
{
columnName = columnNames[column].toString();
}
return (columnName == null) ? super.getColumnName(column) : columnName;
}
}
}
Driver:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
public class DetailedComboBoxDemo implements Runnable
{
private DetailedComboBox combo;
private JTextField name;
private JTextField capital;
public void run()
{
List<List<?>> tableData = new ArrayList<List<?>>();
tableData.add(new ArrayList<String>(
Arrays.asList("MD", "Maryland", "Annapolis")));
tableData.add(new ArrayList<String>(
Arrays.asList("NH", "New Hampshire", "Concord")));
tableData.add(new ArrayList<String>(
Arrays.asList("NJ", "New Jersey", "Trenton")));
tableData.add(new ArrayList<String>(
Arrays.asList("NM", "New Mexico", "Santa Fe")));
tableData.add(new ArrayList<String>(
Arrays.asList("ND", "North Dakota", "Bismark")));
String[] columns = new String[]{"State", "Name", "Capital"};
int[] widths = new int[]{50, 100, 100};
combo = new DetailedComboBox(columns, widths, 0);
combo.setTableData(tableData);
combo.setSelectedIndex(-1);
combo.setPopupAlignment(DetailedComboBox.Alignment.LEFT);
combo.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
showDetails();
}
});
name = new JTextField(10);
capital = new JTextField(10);
name.setEditable(false);
capital.setEditable(false);
JPanel p = new JPanel(new FlowLayout());
p.add(new JLabel("State"));
p.add(combo);
p.add(new JLabel("Name"));
p.add(name);
p.add(new JLabel("Capital"));
p.add(capital);
JFrame frame = new JFrame("DetailedComboBox Demo");
frame.getContentPane().add(p, BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private void showDetails()
{
List<? extends Object> rowData = combo.getSelectedRow();
name.setText(rowData.get(1).toString());
capital.setText(rowData.get(2).toString());
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new DetailedComboBoxDemo());
}
}
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