Java Reference
In-Depth Information
public class PopupSample {
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
JFrame frame = new JFrame("Popup Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JPopupMenu popup = new JPopupMenu();
JMenuItem menuItem1 = new JMenuItem("Option 1");
popup.add(menuItem1);
JMenuItem menuItem2 = new JMenuItem("Option 2");
popup.add(menuItem2);
final JTextField textField = new JTextField();
frame.add(textField, BorderLayout.NORTH);
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
try {
int dotPosition = textField.getCaretPosition();
Rectangle popupLocation = textField.modelToView(dotPosition);
popup.show(textField, popupLocation.x, popupLocation.y);
} catch (BadLocationException badLocationException) {
System.err.println("Oops");
}
}
};
KeyStroke keystroke =
KeyStroke.getKeyStroke(KeyEvent.VK_PERIOD, 0, false);
textField.registerKeyboardAction(actionListener, keystroke,
JComponent.WHEN_FOCUSED);
frame.setSize(250, 150);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
CaretListener Interface and CaretEvent Class
You can listen for cursor movements in two ways: associate a
ChangeListener
with the
Caret
or
associate a
CaretListener
with the
JTextComponent
. Working directly with the
JTextComponent
is the easier approach, though both will function equally well.
