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POHow can I create a "Drop-Down" menu in a Java Swing toolbar?
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copied!<p>I've created a drop-down menu on my Swing JToolBar. But it doesn't create behave the way I want. I'm aiming for it to work like Firefox's "Smart Bookmarks" button.</p> <p>It disappears when the user selects a menu item: CORRECT!</p> <p>It disappears when the user presses ESC: CORRECT!</p> <p>It disappears when the user clicks somewhere in the main frame outside of the menu: CORRECT!</p> <p>But it doesn't disappear when the user clicks a second time on the button that shows the drop-down menu: INCORRECT... :-(</p> <p>My question is how can I add this behaviour, that it does disappear when the clicks on the button that shows the menu a second time.</p> <p>Here's my current code, from Java 6 on the Mac:</p> <pre><code>import javax.swing.*; import javax.swing.event.PopupMenuEvent; import javax.swing.event.PopupMenuListener; import java.awt.*; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; public class ScratchSpace { public static void main(String[] arguments) { SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame frame = new JFrame("Toolbar with Popup Menu demo"); final JToolBar toolBar = new JToolBar(); toolBar.add(createMoreButton()); final JPanel panel = new JPanel(new BorderLayout()); panel.add(toolBar, BorderLayout.NORTH); panel.setPreferredSize(new Dimension(600, 400)); frame.getContentPane().add(panel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } private static AbstractButton createMoreButton() { final JToggleButton moreButton = new JToggleButton("More..."); moreButton.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { if (e.getStateChange() == ItemEvent.SELECTED) { createAndShowMenu((JComponent) e.getSource(), moreButton); } } }); moreButton.setFocusable(false); moreButton.setHorizontalTextPosition(SwingConstants.LEADING); return moreButton; } private static void createAndShowMenu(final JComponent component, final AbstractButton moreButton) { JPopupMenu menu = new JPopupMenu(); menu.add(new JMenuItem("Black")); menu.add(new JMenuItem("Red")); menu.addPopupMenuListener(new PopupMenuListener() { public void popupMenuWillBecomeVisible(PopupMenuEvent e) { } public void popupMenuWillBecomeInvisible(PopupMenuEvent e) { moreButton.setSelected(false); } public void popupMenuCanceled(PopupMenuEvent e) { moreButton.setSelected(false); } }); menu.show(component, 0, component.getHeight()); } } </code></pre>

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