Menu
Javadoc for JPopupMenu constructor says the following:
JPopupMenu
public JPopupMenu(String label)
Constructs a JPopupMenu with the specified title. Parameters: label - the string that a UI **may** use to display as a title for the popup menu.
Key word being "may". Evidently in the default UI, such titles are ignored when creating a popup menu. I very much want such titles in some of my popup menus to be used regardless of whether or not the L&F thinks I should. I can't find the hook to make it so. Evidently, this is buried deep in the UI code somewhere. Is there a way to override this default?
Failing that, I have tried adding a disabled menu item as the first item of the menu. Trouble with that is then I lose control of its rendering, and it renders in the "greyed out" style instead of appearing as the important title. If I don't disable it, then it renders as I want, but is selectable, which a title would not be.
So bottom line, how do I either force the UI to display my title, or failing that, how do I add a non-selectable menu item at the top of the menu that I have full rendering control over?
554
I had similar problem (I mean the original question). I solved it this way:
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.SwingConstants;
public class LabeledPopupMenu extends JPopupMenu
{
private String originalLabelText = null;
private final JLabel label;
private static String replaceHTMLEntities(String text)
{
if (-1 != text.indexOf("<") ||
-1 != text.indexOf(">") ||
-1 != text.indexOf("&"))
{
text = text.replaceAll("&", "&");
text = text.replaceAll("<", "<");
text = text.replaceAll(">", ">");
}
return text;
}
public LabeledPopupMenu()
{
super();
this.label = null;
}
public LabeledPopupMenu(String label)
{
super();
originalLabelText = label;
this.label = new JLabel("<html><b>" +
replaceHTMLEntities(label) + "</b></html>");
this.label.setHorizontalAlignment(SwingConstants.CENTER);
add(this.label);
addSeparator();
}
@Override public void setLabel(String text)
{
if (null == label) return;
originalLabelText = text;
label.setText("<html><b>" +
replaceHTMLEntities(text) +
"</b></html>");
}
@Override public String getLabel()
{
return originalLabelText;
}
}
I have tested it ony on Mac with default L&F, but it worked for me:
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(100, 100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(100, 100);
frame.setVisible(true);
LabeledPopupMenu myPopup = new LabeledPopupMenu("Say & <something>");
myPopup.add(new JMenuItem("Sample item"));
myPopup.show(frame, 50, 50);
}
answered Nov 03 '25 08:11
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