Small Cell Combobox Example
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html /* (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; super.contentsChanged(e); } }; Dimension d = combo.getPreferredSize(); combo.setPopupWidth(d.width); 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) { System.exit(0); } }); frame.setSize(300, 120); frame.setVisible(true); } } /** * @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) .getPopupSize(); popupSize .setSize(popupSize.width, getPopupHeightForRowCount(comboBox .getMaximumRowCount())); Rectangle popupBounds = computePopupBounds(0, comboBox .getBounds().height, popupSize.width, popupSize.height); scroller.setMaximumSize(popupBounds.getSize()); scroller.setPreferredSize(popupBounds.getSize()); scroller.setMinimumSize(popupBounds.getSize()); list.invalidate(); int selectedIndex = comboBox.getSelectedIndex(); if (selectedIndex == -1) { list.clearSelection(); } else { list.setSelectedIndex(selectedIndex); } list.ensureIndexIsVisible(list.getSelectedIndex()); setLightWeightPopupEnabled(comboBox.isLightWeightPopupEnabled()); show(comboBox, popupBounds.x, popupBounds.y); } }; popup.getAccessibleContext().setAccessibleParent(comboBox); return popup; } } class SteppedComboBox extends JComboBox { protected int popupWidth; public SteppedComboBox(ComboBoxModel aModel) { super(aModel); setUI(new SteppedComboBoxUI()); popupWidth = 0; } public SteppedComboBox(final Object[] items) { super(items); setUI(new SteppedComboBoxUI()); popupWidth = 0; } public SteppedComboBox(Vector items) { super(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); } }