// Create some toggle buttons (and subclasses)
JToggleButton tog = new JToggleButton("ToggleButton");
JCheckBox cb = new JCheckBox("CheckBox");
JRadioButton radio = new JRadioButton("RadioButton");
// Add this object as a listener to each toggle button
tog.addActionListener(this);
cb.addActionListener(this);
radio.addActionListener(this);
// Layout the buttons
Box buttonBox = new Box(BoxLayout.Y_AXIS);
buttonBox.add(tog);
buttonBox.add(cb);
buttonBox.add(radio);
// 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
// current edit, then enables/disables the undo/redo buttons as appropriate.
undoButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
try {
edit.undo();
} catch (CannotUndoException ex) { ex.printStackTrace(); }
finally {
undoButton.setEnabled(edit.canUndo());
redoButton.setEnabled(edit.canRedo());
}
}
});
// Add a redo listener: just like the undo listener, but for redo this time.
redoButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
try {
edit.redo();
} catch (CannotRedoException ex) { ex.printStackTrace(); }
finally {
undoButton.setEnabled(edit.canUndo());
redoButton.setEnabled(edit.canRedo());
}
}
});
// Layout 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());
// Layout the main frame
Container content = getContentPane();
content.setLayout(new BorderLayout());
content.add(buttonBox, BorderLayout.CENTER);
content.add(undoRedoBox, BorderLayout.SOUTH);
setSize(400, 150);
