An update to the UndoableJTextField class to avoid some compiler warnings (jdk21).
```
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.undo.*;
public class UndoableTextField extends JTextField {
KeyStroke undoKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_Z,
InputEvent.CTRL_DOWN_MASK);
KeyStroke redoKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_Y,
InputEvent.CTRL_DOWN_MASK);
public UndoableTextField() {
UndoManager undoManager = new UndoManager();
getDocument().addUndoableEditListener(new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent e) {
undoManager.addEdit(e.getEdit());
}
});
getInputMap().put(undoKeyStroke, "undoKeyStroke");
getActionMap().put("undoKeyStroke", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
undoManager.undo();
}
catch (CannotUndoException cue) {
}
}
});
getInputMap().put(redoKeyStroke, "redoKeyStroke");
getActionMap().put("redoKeyStroke", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
undoManager.redo();
}
catch (CannotRedoException cre) {
}
}
});
}
}
```
From you're example, it's difficult to know how much you've done, but I was able to get this to work...
private UndoManager undoManager;
// In the constructor
undoManager = new UndoManager();
Document doc = textArea.getDocument();
doc.addUndoableEditListener(new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent e) {
System.out.println("Add edit");
undoManager.addEdit(e.getEdit());
}
});
InputMap im = textArea.getInputMap(JComponent.WHEN_FOCUSED);
ActionMap am = textArea.getActionMap();
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_Z, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()), "Undo");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_Y, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()), "Redo");
am.put("Undo", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
if (undoManager.canUndo()) {
undoManager.undo();
}
} catch (CannotUndoException exp) {
exp.printStackTrace();
}
}
});
am.put("Redo", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
if (undoManager.canRedo()) {
undoManager.redo();
}
} catch (CannotUndoException exp) {
exp.printStackTrace();
}
}
});
