// Create some toggle buttons (and subclasses).
tog = new JToggleButton("ToggleButton");
cb = new JCheckBox("CheckBox");
radio = new JRadioButton("RadioButton");
// Add our listener to the buttons.
SimpleListener sl = new SimpleListener();
tog.addActionListener(sl);
cb.addActionListener(sl);
radio.addActionListener(sl);
// Lay out the buttons.
Box buttonBox = new Box(BoxLayout.Y_AXIS);
buttonBox.add(tog);
buttonBox.add(cb);
buttonBox.add(radio);
// Create undo, redo, start, and end buttons.
startButton = new JButton("Start");
endButton = new JButton("End");
undoButton = new JButton("Undo");
redoButton = new JButton("Redo");
startButton.setEnabled(true);
endButton.setEnabled(false);
undoButton.setEnabled(false);
redoButton.setEnabled(false);
// Add a listener to the start button. It creates a new StateEdit,
// passing in this frame as the StateEditable.
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
edit = new StateEdit(UndoableToggleApp4.this);
startButton.setEnabled(false);
endButton.setEnabled(true);
//undoButton.setEnabled(edit.canUndo());
//
// NOTE: We really don't want to be able to undo until end() is pressed,
// but StateEdit does not enforce this for us!
undoButton.setEnabled(false);
redoButton.setEnabled(edit.canRedo());
}
});
// Add a listener to the end button. It will call end() on the StateEdit.
endButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
edit.end();
startButton.setEnabled(true);
endButton.setEnabled(false);
undoButton.setEnabled(edit.canUndo());
redoButton.setEnabled(edit.canRedo());
}
});
// 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.
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());
}
}
});
// Lay out the state/end and undo/redo buttons.
Box undoRedoBox = new Box(BoxLayout.X_AXIS);
undoRedoBox.add(Box.createGlue());
undoRedoBox.add(startButton);
undoRedoBox.add(Box.createHorizontalStrut(2));
undoRedoBox.add(endButton);
undoRedoBox.add(Box.createHorizontalStrut(2));
undoRedoBox.add(undoButton);
undoRedoBox.add(Box.createHorizontalStrut(2));
undoRedoBox.add(redoButton);
undoRedoBox.add(Box.createGlue());
// Lay out the main frame.
Container content = getContentPane();
content.setLayout(new BorderLayout());
content.add(buttonBox, BorderLayout.CENTER);
content.add(undoRedoBox, BorderLayout.SOUTH);
setSize(400, 150);
