// Create some toggle buttons
UndoableJToggleButton tog1 = new UndoableJToggleButton("One");
UndoableJToggleButton tog2 = new UndoableJToggleButton("Two");
UndoableJToggleButton tog3 = new UndoableJToggleButton("Three");
// Add this object as a listener to each toggle button
tog1.addUndoableEditListener(this);
tog2.addUndoableEditListener(this);
tog3.addUndoableEditListener(this);
// Lay out the buttons
Box buttonBox = new Box(BoxLayout.Y_AXIS);
buttonBox.add(tog1);
buttonBox.add(tog2);
buttonBox.add(tog3);
// Create undo and redo buttons (initially disabled)
undoButton = new JButton("Undo");
redoButton = new JButton("Redo");
undoButton.setEnabled(false);
redoButton.setEnabled(false);
// Add a listener to the undo button. It attempts to call undo() on the
// UndoManager, then enables/disables the undo/redo buttons as appropriate.
undoButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
try {
manager.undo();
} catch (CannotUndoException ex) { ex.printStackTrace(); }
finally {
updateButtons();
}
}
});
// Add a redo listener: just like the undo listener.
redoButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
try {
manager.redo();
} catch (CannotRedoException ex) { ex.printStackTrace(); }
finally {
updateButtons();
}
}
});
// Lay out the undo/redo buttons
Box undoRedoBox = new Box(BoxLayout.X_AXIS);
undoRedoBox.add(Box.createGlue());
undoRedoBox.add(undoButton);
undoRedoBox.add(Box.createHorizontalStrut(2));
undoRedoBox.add(redoButton);
undoRedoBox.add(Box.createGlue());
// Lay out the main frame
getContentPane().setLayout(new BorderLayout());
getContentPane().add(buttonBox, BorderLayout.CENTER);
getContentPane().add(undoRedoBox, BorderLayout.SOUTH);
setSize(400, 150);
