Toggle Menu Item
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski
ISBN: 1-893115-78-X
Publisher: APress
*/
import java.awt.Color;
import java.awt.Component;
import java.awt.Event;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import javax.swing.Action;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JToggleButton;
import javax.swing.KeyStroke;
import javax.swing.MenuElement;
import javax.swing.MenuSelectionManager;
import javax.swing.event.MouseInputListener;
public class ToggleSample {
public static void main(String args[]) {
JFrame frame = new JFrame("JToggleButtonMenuItem Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar bar = new JMenuBar();
JMenu file = new JMenu("File");
file.setMnemonic('f');
JMenuItem newItem = new JMenuItem("New", 'N');
file.add(newItem);
JMenuItem openItem = new JMenuItem("Open", 'O');
file.add(openItem);
JMenuItem closeItem = new JMenuItem("Close", 'C');
file.add(closeItem);
file.addSeparator();
JMenuItem saveItem = new JMenuItem("Save", 'S');
file.add(saveItem);
file.addSeparator();
JMenuItem exitItem = new JMenuItem("Exit", 'X');
file.add(exitItem);
bar.add(file);
JMenu edit = new JMenu("Edit");
JMenuItem cutItem = new JMenuItem("Cut", 'T');
cutItem.setAccelerator(KeyStroke.getKeyStroke('X', Event.CTRL_MASK));
edit.add(cutItem);
JMenuItem copyItem = new JMenuItem("Copy", 'C');
copyItem.setAccelerator(KeyStroke.getKeyStroke('C', Event.CTRL_MASK));
edit.add(copyItem);
JMenuItem pasteItem = new JMenuItem("Paste", 'P');
pasteItem.setAccelerator(KeyStroke.getKeyStroke('V', Event.CTRL_MASK));
pasteItem.setEnabled(false);
edit.add(pasteItem);
edit.addSeparator();
JMenuItem findItem = new JMenuItem("Find", 'F');
findItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3, 0));
edit.add(findItem);
edit.setMnemonic('e');
Icon atIcon = new ImageIcon("at.gif");
JMenu findOptions = new JMenu("Options");
findOptions.setIcon(atIcon);
findOptions.setMnemonic('O');
ButtonGroup directionGroup = new ButtonGroup();
JRadioButtonMenuItem forward = new JRadioButtonMenuItem("Forward", true);
findOptions.add(forward);
directionGroup.add(forward);
JRadioButtonMenuItem backward = new JRadioButtonMenuItem("Backward");
findOptions.add(backward);
directionGroup.add(backward);
findOptions.addSeparator();
JCheckBoxMenuItem caseItem = new JCheckBoxMenuItem("Case Insensitive");
findOptions.add(caseItem);
edit.add(findOptions);
JToggleButtonMenuItem toggleItem = new JToggleButtonMenuItem(
"Ballon Help");
toggleItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Selected");
}
});
edit.add(toggleItem);
bar.add(edit);
frame.setJMenuBar(bar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
class JToggleButtonMenuItem extends JToggleButton implements MenuElement {
Color savedForeground = null;
private static MenuElement NO_SUB_ELEMENTS[] = new MenuElement[0];
public JToggleButtonMenuItem() {
init();
}
public JToggleButtonMenuItem(String label) {
super(label);
init();
}
public JToggleButtonMenuItem(String label, Icon icon) {
super(label, icon);
init();
}
public JToggleButtonMenuItem(Action action) {
super(action);
init();
}
private void init() {
updateUI();
setRequestFocusEnabled(false);
// Borrows heavily from BasicMenuUI
MouseInputListener mouseInputListener = new MouseInputListener() {
// If mouse released over this menu item, activate it
public void mouseReleased(MouseEvent mouseEvent) {
MenuSelectionManager menuSelectionManager = MenuSelectionManager
.defaultManager();
Point point = mouseEvent.getPoint();
if ((point.x >= 0) && (point.x < getWidth()) && (point.y >= 0)
&& (point.y < getHeight())) {
menuSelectionManager.clearSelectedPath();
// component automatically handles "selection" at this point
// doClick(0); // not necessary
} else {
menuSelectionManager.processMouseEvent(mouseEvent);
}
}
// If mouse moves over menu item, add to selection path, so it
// becomes armed
public void mouseEntered(MouseEvent mouseEvent) {
MenuSelectionManager menuSelectionManager = MenuSelectionManager
.defaultManager();
menuSelectionManager.setSelectedPath(getPath());
}
// When mouse moves away from menu item, disaarm it and select
// something else
public void mouseExited(MouseEvent mouseEvent) {
MenuSelectionManager menuSelectionManager = MenuSelectionManager
.defaultManager();
MenuElement path[] = menuSelectionManager.getSelectedPath();
if (path.length > 1) {
MenuElement newPath[] = new MenuElement[path.length - 1];
for (int i = 0, c = path.length - 1; i < c; i++) {
newPath[i] = path[i];
}
menuSelectionManager.setSelectedPath(newPath);
}
}
// Pass along drag events
public void mouseDragged(MouseEvent mouseEvent) {
MenuSelectionManager.defaultManager().processMouseEvent(
mouseEvent);
}
public void mouseClicked(MouseEvent mouseEvent) {
}
public void mousePressed(MouseEvent mouseEvent) {
}
public void mouseMoved(MouseEvent mouseEvent) {
}
};
addMouseListener(mouseInputListener);
addMouseMotionListener(mouseInputListener);
}
// MenuElement methods
public Component getComponent() {
return this;
}
public MenuElement[] getSubElements() {
// no subelements
return NO_SUB_ELEMENTS;
}
public void menuSelectionChanged(boolean isIncluded) {
ButtonModel model = getModel();
// only change armed state if different
if (model.isArmed() != isIncluded) {
model.setArmed(isIncluded);
}
if (isIncluded) {
savedForeground = getForeground();
if (!savedForeground.equals(Color.blue)) {
setForeground(Color.blue);
} else {
// In case foreground blue, use something different
setForeground(Color.red);
}
} else {
setForeground(savedForeground);
// if null, get foreground from installed look and feel
if (savedForeground == null) {
updateUI();
}
}
}
public void processKeyEvent(KeyEvent keyEvent, MenuElement path[],
MenuSelectionManager manager) {
// If user presses space while menu item armed, select it
if (getModel().isArmed()) {
int keyChar = keyEvent.getKeyChar();
if (keyChar == KeyEvent.VK_SPACE) {
manager.clearSelectedPath();
doClick(0); // inherited from AbstractButton
}
}
}
public void processMouseEvent(MouseEvent mouseEvent, MenuElement path[],
MenuSelectionManager manager) {
// For when mouse dragged over menu and button released
if (mouseEvent.getID() == MouseEvent.MOUSE_RELEASED) {
manager.clearSelectedPath();
doClick(0); // inherited from AbstractButton
}
}
// Borrows heavily from BasicMenuItemUI.getPath()
private MenuElement[] getPath() {
MenuSelectionManager menuSelectionManager = MenuSelectionManager
.defaultManager();
MenuElement oldPath[] = menuSelectionManager.getSelectedPath();
MenuElement newPath[];
int oldPathLength = oldPath.length;
if (oldPathLength == 0)
return new MenuElement[0];
Component parent = getParent();
if (oldPath[oldPathLength - 1].getComponent() == parent) {
// Going deeper under the parent menu
newPath = new MenuElement[oldPathLength + 1];
System.arraycopy(oldPath, 0, newPath, 0, oldPathLength);
newPath[oldPathLength] = this;
} else {
// Sibling/child menu item currently selected
int newPathPosition;
for (newPathPosition = oldPath.length - 1; newPathPosition >= 0; newPathPosition--) {
if (oldPath[newPathPosition].getComponent() == parent) {
break;
}
}
newPath = new MenuElement[newPathPosition + 2];
System.arraycopy(oldPath, 0, newPath, 0, newPathPosition + 1);
newPath[newPathPosition + 1] = this;
}
return newPath;
}
}
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