Click on the hamburger menu-like
JButton placed on the
JToolBar to switch this with the
JMenuBar
Code
JMenuBar mainMenuBar = makeMenuBar();
JButton button = makeHamburgerMenuButton(mainMenuBar);
JMenuBar wrappingMenuBar = new JMenuBar();
wrappingMenuBar.add(makeToolBar(button));
EventQueue.invokeLater(() -> getRootPane().setJMenuBar(wrappingMenuBar));
PopupMenuListener handler = new PopupMenuListener() {
@Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
// not need
}
@Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
EventQueue.invokeLater(() -> {
if (MenuSelectionManager.defaultManager().getSelectedPath().length == 0) {
getRootPane().setJMenuBar(wrappingMenuBar);
}
});
}
@Override public void popupMenuCanceled(PopupMenuEvent e) {
EventQueue.invokeLater(() -> getRootPane().setJMenuBar(wrappingMenuBar));
}
};
for (int i = 0; i < mainMenuBar.getMenuCount(); i++) {
mainMenuBar.getMenu(i).getPopupMenu().addPopupMenuListener(handler);
}
// ...
private JButton makeHamburgerMenuButton(JMenuBar menuBar) {
JButton button = new JButton("Ξ") {
@Override public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
d.height = menuBar.getMenu(0).getPreferredSize().height;
return d;
}
@Override public void updateUI() {
super.updateUI();
setContentAreaFilled(false);
setFocusPainted(false);
setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2));
}
};
button.addActionListener(e -> {
getRootPane().setJMenuBar(menuBar);
getRootPane().revalidate();
EventQueue.invokeLater(() -> menuBar.getMenu(0).doClick());
});
button.setMnemonic('\\');
button.setToolTipText("Main Menu(Alt+\\)");
return button;
}
References
