JComboBox: adding automatic completion-Fixed Auto Selection
//Code from: http://www.orbital-computer.de/JComboBox/
/*
Inside JComboBox: adding automatic completion
Author: Thomas Bierhance
thomas@orbital-computer.de
*/
import javax.swing.*;
import javax.swing.text.*;
public class S03FixedAutoSelection extends PlainDocument {
ComboBoxModel model;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
boolean selecting=false;
public S03FixedAutoSelection(ComboBoxModel model) {
this.model = model;
}
public void remove(int offs, int len) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
super.remove(offs, len);
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
System.out.println("insert " + str + " at " + offs);
// insert the string into the document
super.insertString(offs, str, a);
// get the resulting string
String content = getText(0, getLength());
// lookup a matching item
Object item = lookupItem(content);
// select the item (or deselect if null)
if(item!=model.getSelectedItem()) System.out.println("Selecting '" + item + "'");
selecting = true;
model.setSelectedItem(item);
selecting = false;
}
private Object lookupItem(String pattern) {
// 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.toString().startsWith(pattern)) {
return currentItem;
}
}
// no item starts with the pattern => return null
return null;
}
private static void createAndShowGUI() {
// the combo box (add/modify items if you like to)
JComboBox comboBox = new JComboBox(new Object[] {"Ester", "Jordi", "Jordina", "Jorge", "Sergi"});
// has to be editable
comboBox.setEditable(true);
// get the combo boxes editor component
JTextComponent editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
// change the editor's document
editor.setDocument(new S03FixedAutoSelection(comboBox.getModel()));
// create and show a window containing the combo box
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(3);
frame.getContentPane().add(comboBox);
frame.pack(); frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
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