| Код |
import javax.swing.*;
import javax.swing.text.*;
public class Julietta_class extends PlainDocument {
JComboBox comboBox;
ComboBoxModel model;
JTextComponent editor;
boolean selecting=false;
public Julietta_class(final JComboBox comboBox) {
this.comboBox = comboBox;
model = comboBox.getModel();
editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
}
public void remove(int offs, int len) throws BadLocationException {
if (selecting) return;
super.remove(offs, len);
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
if (selecting) return;
super.insertString(offs, str, a);
Object item = lookupItem(getText(0, getLength()));
if (item != null) {
setSelectedItem(item);
} else {
item = comboBox.getSelectedItem();
offs = offs-str.length();
comboBox.getToolkit().beep();
}
setText(item.toString());
highlightCompletedText(offs+str.length());
}
private void setText(String text) throws BadLocationException {
super.remove(0, getLength());
super.insertString(0, text, null);
}
private void highlightCompletedText(int start) {
editor.setSelectionStart(start);
editor.setSelectionEnd(getLength());
}
private void setSelectedItem(Object item) {
selecting = true;
model.setSelectedItem(item);
selecting = false;
}
private Object lookupItem(String pattern) {
Object selectedItem = model.getSelectedItem();
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);
if (startsWithIgnoreCase(currentItem.toString(), pattern)) {
return currentItem;
}
}
}
System.out.println("Исключение '" + pattern + "'");
return null;
}
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}
private static void startMyGUI() {
JComboBox comboBox = new JComboBox(new Object[] {"Julietta", "Juli", "Peter", "Masha", "Sveta"});
comboBox.setEditable(true);
JTextComponent editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
editor.setDocument(new Julietta_class(comboBox));
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() {
startMyGUI();
}
});
}
}
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