UndoableToggleApp4public class UndoableToggleApp4 extends JFrame implements StateEditable, ActionListener
| Fields Summary |
|---|
| private JToggleButton | tog | | private JCheckBox | cb | | private JRadioButton | radio | | private JButton | undoButton | | private JButton | redoButton | | private JButton | startButton | | private JButton | endButton | | private StateEdit | edit |
| Constructors Summary |
|---|
public UndoableToggleApp4()
// Create some toggle buttons (and subclasses)
tog = new JToggleButton("ToggleButton");
cb = new JCheckBox("CheckBox");
radio = new JRadioButton("RadioButton");
// Add this frame as a listener to the buttons
tog.addActionListener(this);
cb.addActionListener(this);
radio.addActionListener(this);
// 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(StateEditable.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);
|
| Methods Summary |
|---|
| public void | actionPerformed(java.awt.event.ActionEvent ev)
undoButton.setEnabled(false);
redoButton.setEnabled(false);
| | public static void | main(java.lang.String[] args)
JFrame f = new UndoableToggleApp4();
f.addWindowListener(new BasicWindowMonitor());
f.setVisible(true);
| | public void | restoreState(java.util.Hashtable ht)
Boolean b1 = (Boolean)ht.get(tog);
if (b1 != null)
tog.setSelected(b1.booleanValue());
Boolean b2 = (Boolean)ht.get(cb);
if (b2 != null)
cb.setSelected(b2.booleanValue());
Boolean b3 = (Boolean)ht.get(radio);
if (b3 != null)
radio.setSelected(b3.booleanValue());
| | public void | storeState(java.util.Hashtable ht)
ht.put(tog, new Boolean(tog.isSelected()));
ht.put(cb, new Boolean(cb.isSelected()));
ht.put(radio, new Boolean(radio.isSelected()));
|
|
