Does an AutoCompleten exist for java?
Like when you go to google or yahoo, and you type in text at the search field, and a window drops down displaying similar text, and the text most similiar to it is in the search field.
It could be any forum because there could be a plug-in under apache that I don't know about.
The one that I come across a lot is this one and it has a huge error.
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import javax.swing.text.*;
/* This work is hereby released into the Public Domain.
* To view a copy of the public domain dedication, visit
* http://creativecommons.org/licenses/publicdomain/
*/
public class AutoCompletion extends PlainDocument {
JComboBox comboBox;
ComboBoxModel model;
JTextComponent editor;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
boolean selecting=false;
boolean hidePopupOnFocusLoss;
boolean hitBackspace=false;
boolean hitBackspaceOnSelection;
KeyListener editorKeyListener;
FocusListener editorFocusListener;
public AutoCompletion(final JComboBox comboBox) {
this.comboBox = comboBox;
model = comboBox.getModel();
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!selecting) highlightCompletedText(0);
}
});
comboBox.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent e) {
if (e.getPropertyName().equals("editor")) configureEditor((ComboBoxEditor) e.getNewValue());
if (e.getPropertyName().equals("model")) model = (ComboBoxModel) e.getNewValue();
}
});
editorKeyListener = new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (comboBox.isDisplayable()) comboBox.setPopupVisible(true);
hitBackspace=false;
switch (e.getKeyCode()) {
// determine if the pressed key is backspace (needed by the remove method)
case KeyEvent.VK_BACK_SPACE : hitBackspace=true;
hitBackspaceOnSelection=editor.getSelectionStart()!=editor.getSelectionEnd();
break;
// ignore delete key
case KeyEvent.VK_DELETE : e.consume();
comboBox.getToolkit().beep();
break;
}
}
};
// Bug 5100422 on Java 1.5: Editable JComboBox won't hide popup when tabbing out
hidePopupOnFocusLoss=System.getProperty("java.version").startsWith("1.5");
// Highlight whole text when gaining focus
editorFocusListener = new FocusAdapter() {
public void focusGained(FocusEvent e) {
highlightCompletedText(0);
}
public void focusLost(FocusEvent e) {
// Workaround for Bug 5100422 - Hide Popup on focus loss
if (hidePopupOnFocusLoss) comboBox.setPopupVisible(false);
}
};
configureEditor(comboBox.getEditor());
// Handle initially selected object
Object selected = comboBox.getSelectedItem();
if (selected!=null) setText(selected.toString());
highlightCompletedText(0);
}
public static void enable(JComboBox comboBox) {
// has to be editable
comboBox.setEditable(true);
// change the editor's document
new AutoCompletion(comboBox);
}
void configureEditor(ComboBoxEditor newEditor) {
if (editor != null) {
editor.removeKeyListener(editorKeyListener);
editor.removeFocusListener(editorFocusListener);
}
if (newEditor != null) {
editor = (JTextComponent) newEditor.getEditorComponent();
editor.addKeyListener(editorKeyListener);
editor.addFocusListener(editorFocusListener);
editor.setDocument(this);
}
}
public void remove(int offs, int len) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
if (hitBackspace) {
// user hit backspace => move the selection backwards
// old item keeps being selected
if (offs>0) {
if (hitBackspaceOnSelection) offs--;
} else {
// User hit backspace with the cursor positioned on the start => beep
comboBox.getToolkit().beep(); // when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);
}
highlightCompletedText(offs);
} else {
super.remove(offs, len);
}
}
private final boolean strict_match = false;
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
// insert the string into the document
super.insertString(offs, str, a);
// lookup and select a matching item
Object item = lookupItem(getText(0, getLength()));
if(strict_match) {
if (item != null) {
setSelectedItem(item);
} else {
// keep old item selected if there is no match
item = comboBox.getSelectedItem();
// imitate no insert (later on offs will be incremented by str.length(): selection won't move forward)
offs = offs-str.length();
// provide feedback to the user that his input has been received but can not be accepted
comboBox.getToolkit().beep(); // when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);
}
setText(item.toString());
// select the completed part
highlightCompletedText(offs+str.length());
} else {
boolean listContainsSelectedItem = true;
if (item == null) {
// no item matches => use the current input as selected item
item=getText(0, getLength());
listContainsSelectedItem=false;
} else {
setSelectedItem(item);
}
setText(item.toString());
// select the completed part
if (listContainsSelectedItem) highlightCompletedText(offs+str.length());
}
}
private void setText(String text) {
try {
// remove all text and insert the completed string
super.remove(0, getLength());
super.insertString(0, text, null);
} catch (BadLocationException e) {
throw new RuntimeException(e.toString());
}
}
private void highlightCompletedText(int start) {
editor.setCaretPosition(getLength());
editor.moveCaretPosition(start);
}
private void setSelectedItem(Object item) {
selecting = true;
model.setSelectedItem(item);
selecting = false;
}
private Object lookupItem(String pattern) {
Object selectedItem = model.getSelectedItem();
// only search for a different item if the currently selected does not match
if (selectedItem != null && startsWithIgnoreCase(selectedItem.toString(), pattern)) {
return selectedItem;
} else {
// iterate over all items
for (int i=0, n=model.getSize(); i < n; i++) {
Object currentItem = model.getElementAt(i);
// current item starts with the pattern?
if (currentItem != null && startsWithIgnoreCase(currentItem.toString(), pattern)) {
return currentItem;
}
}
}
// no item starts with the pattern => return null
return null;
}
// checks if str1 starts with str2 - ignores case
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}
private static void createAndShowGUI() {
// the combo box (add/modify items if you like to)
final JComboBox test_comboBox = new JComboBox(new Object[] {"Ester", "Jordi", "Jordina", "Jorge", "Sergi"});
enable(test_comboBox);
// create and show a window containing the combo box
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(3);
frame.getContentPane().add(test_comboBox);
frame.pack(); frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.plaf.basic.*;
class Test
{
private JComboBox_ cb = null;
public Test() {
JFrame fr=new JFrame("TEST ComboBox");
JPanel p = new JPanel();
p.setLayout( new BorderLayout() );
String[] ss = new String[]
{ "112","1123","1124","1134",
"first",
"second",
"third",
"third 1 before",
"third 2",
"third 1 after",
"third quarter",
"fourth",
"fourth and more",
"fourth and more and more"
};
fr.getContentPane().add(p);
cb = new JComboBox_(ss);
p.add("South",cb);
p.add("Center",new JButton("test combo box"));
fr.pack();
fr.show();
}
public static void main( String[] args ) {
Test test=new Test();
}
}
class JComboBox_ extends JComboBox {
public int caretPos=0;
public JTextField tf=null;
public JComboBox_(final Object items[]) {
super(items);
this.setEditor(new BasicComboBoxEditor());
this.setEditable(true);
}
public void setSelectedIndex(int ind) {
super.setSelectedIndex(ind);
tf.setText(getItemAt(ind).toString());
tf.setSelectionEnd(caretPos+tf.getText().length());
tf.moveCaretPosition(caretPos);
//tf.setSelectionStart(caretPos);
}
public void setEditor(ComboBoxEditor anEditor) {
super.setEditor(anEditor);
if (anEditor.getEditorComponent() instanceof JTextField) {
tf=(JTextField)anEditor.getEditorComponent();
tf.addKeyListener(new KeyAdapter()
{
public void keyReleased( KeyEvent ev )
{
char key=ev.getKeyChar();
if (! (Character.isLetterOrDigit(key)||Character.isSpaceChar(key) )) return;
String s = tf.getText();
caretPos=tf.getCaretPosition();
String text="";
try {
text=tf.getText(0,caretPos);
}
catch (Exception ex) {
ex.printStackTrace();
}
int n=getItemCount();
for (int i=0; i<n; i++) {
int ind=((String)getItemAt(i)).indexOf(text);
if (ind==0) {
setSelectedIndex(i);
return;
}
}
}
} );
}
}
}
Hope this helps.
Regards,
Stas>