/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package uk.chromis.pos.util;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.ComboBoxEditor;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
public class AutoCompleteComboBox extends PlainDocument {
private JComboBox comboBox;
private ComboBoxModel model;
private JTextComponent editor;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
private boolean selecting = false;
private boolean hidePopupOnFocusLoss;
private boolean hitBackspace = false;
private boolean hitBackspaceOnSelection;
private KeyListener editorKeyListener;
private FocusListener editorFocusListener;
public AutoCompleteComboBox(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()) {
case KeyEvent.VK_BACK_SPACE:
hitBackspace = true;
hitBackspaceOnSelection = editor.getSelectionStart() != editor.getSelectionEnd();
break;
case KeyEvent.VK_DELETE:
e.consume();
Toolkit.getDefaultToolkit().beep();
break;
}
}
};
editorFocusListener = new FocusAdapter() {
public void focusGained(FocusEvent e) {
highlightCompletedText(0);
}
};
configureEditor(comboBox.getEditor());
Object selected = comboBox.getSelectedItem();
if (selected != null) {
setText(selected.toString());
}
highlightCompletedText(0);
}
public static void enable(JComboBox comboBox) {
comboBox.setEditable(true);
new AutoCompleteComboBox(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 offSet, int len) throws BadLocationException {
if (selecting) {
return;
}
if (hitBackspace) {
switch (offSet) {
case 0:
setText("");
model.setSelectedItem(null);
break;
default:
if (hitBackspaceOnSelection) {
offSet--;
if (offSet == 0) {
setText("");
model.setSelectedItem(null);
}
}
break;
}
highlightCompletedText(offSet);
} else {
super.remove(offSet, len);
}
}
public void insertString(int offSet, String str, AttributeSet a) throws BadLocationException {
if (selecting) {
return;
}
super.insertString(offSet, str, a);
Object item = lookupItem(getText(0, getLength()));
if (item != null) {
setSelectedItem(item);
} else {
item = comboBox.getSelectedItem();
offSet = offSet - str.length();// - 1;
if (offSet < 0) {
offSet = 0;
}
Toolkit.getDefaultToolkit().beep();
}
if (item != null) {
setText(item.toString());
highlightCompletedText(offSet + str.length());
} else {
super.remove(0, getLength());
}
}
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 {
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;
}
}
}
return null;
}
// checks if str1 starts with str2 - ignores case
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}
}