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Auto complete or search in a JComboBox
import java.awt.Component;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboBoxEditor;
import javax.swing.text.*;
public class AutoCompleteComboBox extends JComboBox
{
private static final Locale[] INSTALLED_LOCALES = Locale.getAvailableLocales();
private ComboBoxModel model = null;
public static void main(String[] args)
{
JFrame f = new JFrame(“AutoCompleteComboBox”);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
AutoCompleteComboBox box = new AutoCompleteComboBox(INSTALLED_LOCALES, false);
f.getContentPane().add(box);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
/** * Constructor for AutoCompleteComboBox –
* The Default Model is a TreeSet which is alphabetically sorted and doesnt allow
duplicates. * @param items */
public AutoCompleteComboBox(Object[] items, boolean caseSensitive)
{
super(items);
model = new ComboBoxModel(items);
setModel(model);
setEditable(true);
setEditor(new AutoCompleteEditor(this, caseSensitive));
}
/** * Constructor for AutoCompleteComboBox –
* The Default Model is a TreeSet which is alphabetically sorted and doesnt allow
duplicates. * @param items */
public AutoCompleteComboBox(Vector items, boolean caseSensitive)
{
super(items);
model = new ComboBoxModel(items);
setModel(model);
setEditable(true);
setEditor(new AutoCompleteEditor(this, caseSensitive));
}
/** * Constructor for AutoCompleteComboBox –
* This constructor uses JComboBox’s Default Model which is a Vector.
* @param caseSensitive */
public AutoCompleteComboBox(boolean caseSensitive)
{
super();
setEditable(true);
setEditor(new AutoCompleteEditor(this, caseSensitive));
}
/* * ComboBoxModel.java */
public class ComboBoxModel extends DefaultComboBoxModel
{
/** * The TreeSet which holds the combobox’s data (ordered no duplicates)
*/
private TreeSet values = null;
public ComboBoxModel(List items)
{
super();
this.values = new TreeSet();
int i, c;
for (i = 0, c = items.size(); i < c; i++)
values.add(items.get(i).toString());
Iterator it = values.iterator();
while (it.hasNext())
super.addElement(it.next().toString());
}
public ComboBoxModel(final Object items[])
{
this(Arrays.asList(items));
}
}
/* * AutoCompleteEditor.java */
public class AutoCompleteEditor extends BasicComboBoxEditor
{
private JTextField editor = null;
public AutoCompleteEditor(JComboBox combo, boolean caseSensitive)
{
super();
editor = new AutoCompleteEditorComponent(combo, caseSensitive);
}
/**
* overrides BasicComboBox’s getEditorComponent to return custom TextField
(AutoCompleteEditorComponent) */
public Component getEditorComponent()
{
return editor;
}
}
/* * AutoCompleteEditorComponent.java */
public class AutoCompleteEditorComponent extends JTextField
{
JComboBox combo = null;
boolean caseSensitive = false;
public AutoCompleteEditorComponent(JComboBox combo, boolean caseSensitive)
{
super();
this.combo = combo;
this.caseSensitive = caseSensitive;
}
/**
* overwritten to return custom PlainDocument which does the work*/
protected Document createDefaultModel()
{
return new PlainDocument()
{
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException
{
if (str == null || str.length() == 0)
return;
int size = combo.getItemCount();
String text = getText(0, getLength());
for (int i = 0; i < size; i++)
{
String item = combo.getItemAt(i).toString();
if (getLength() + str.length() > item.length())
continue;
if (!caseSensitive)
{
if ((text + str).equalsIgnoreCase(item))
{
combo.setSelectedIndex(i);
//if (!combo.isPopupVisible())
// combo.setPopupVisible(true);
super.remove(0, getLength());
super.insertString(0, item, a);
return;
}
else if (item.substring(0, getLength() + str.length()).equalsIgnoreCase(text + str))
{
combo.setSelectedIndex(i);
if (!combo.isPopupVisible())
combo.setPopupVisible(true);
super.remove(0, getLength());
super.insertString(0, item, a);
return;
}
}
else if (caseSensitive)
{
if ((text + str).equals(item))
{
combo.setSelectedIndex(i);
if (!combo.isPopupVisible())
combo.setPopupVisible(true);
super.remove(0, getLength());
super.insertString(0, item, a);
return;
}
else if (item.substring(0, getLength() + str.length()).equals(text + str))
{
combo.setSelectedIndex(i);
if (!combo.isPopupVisible())
combo.setPopupVisible(true);
super.remove(0, getLength());
super.insertString(0, item, a);
return;
}
}
}
}
};
}
}
}
