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    <p>I have tested default behaviour of a combobox. And when I am scrolling over the popup it is fine it will not close it. But when I scroll outside it or even over the combobox itself then it disappears. </p> <p>I do not know if you are after something like this but I have added the mouse wheel listener to the combobox this way if I detect the movement over the combobox there I am reshowing the popup. -- This bit only partially solves the issue that the mouse wheeling will not show the combo box when scrolling over the combobox.</p> <pre><code>import java.awt.HeadlessException; import java.awt.event.MouseWheelEvent; import java.awt.event.MouseWheelListener; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class ComboBoxMouseWheel { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { createGUI(); } }); } private static void createGUI() throws HeadlessException { String[] items = new String[] { "oasoas", "saas", "saasas" }; final JComboBox jcb = new JComboBox(items); jcb.addMouseWheelListener(new MouseWheelListener() { @Override public void mouseWheelMoved(MouseWheelEvent e) { System.out.println("ohjasajs"); e.consume(); jcb.showPopup(); } }); JPanel p = new JPanel(); p.add(jcb); JPanel contentPane = new JPanel(); contentPane.add(p); JFrame f = new JFrame(); f.setContentPane(contentPane); f.setSize(300, 300); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } } </code></pre> <p>I hope this is helpful even a bit. If you manage to solve other way please do share it with us. The solution provided by @trashgod seems doable but it looks so elaborated :), thus I propose mine approach an alternative.</p> <p>Good luck, Boro.</p>
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    1. POScrolling on a JComboBox popup hide it
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    1. COThank you for your answer. Maybe it does this only with Java on Mac OS X (which is not a standard Mac OS X behavior). Swing use a nested component for its popup, so the mouseWheelMoved responds only when using wheel over the JComboBox area and not its popup.
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    2. COYea. You are completely right. Just tested it on my mates Mac and I must admit that my hack actually doesn't solve anything in fact it makes it worse. First of all why the heck Mac makes the JComboBox to look like JSpinner? BTW is there a component which works like Mac's combobox, i.e. looks like spinner, allows you to use them to select an item but still lets you to chose from list of options, like combo box?
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    3. COIt looks like that because of the Mac Aqua look and feel.
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