Zalberth Zalberth - 7 months ago 33
Java Question

How to set a size for JMenuItem?

enter image description here

As you can see, it's ugly to have these kind of

JMenuItem
s. The width of the menu items is quite small.

Here is the code:

JMenu menuOne=new JMenu("MenuOne");
JMenu menuTwo=new JMenu("MenuTwo");
JMenu menuThree=new JMenu("MenuThree");
JMenu menuFour=new JMenu("MenuFour");
JMenuBar mbar=new JMenuBar();
//add the menu to menubar
mbar.add(menuOne);
JMenuItem OneItOne=new JMenuItem("1");

JMenuItem OneItTwo=new JMenuItem("2");
menuOne.add(OneItOne);
menuOne.addSeparator();
menuOne.add(OneItTwo);
mbar.add(menuTwo);
mbar.add(menuThree);
mbar.add(menuFour);
setJMenuBar(mbar);


Simply adding some blanks in the String is okay (e.g.
"1     "
), but is there any better way to set a preferred length of
JMenuItem
? I've tried
OneItTwo.setSize()
, but failed.

Answer

setPreferredSize(new Dimension(...)); works on menu items. setMinimumSize does not work though; it does not seem to be honored by the menu layout manager, so if you want to set a minimum that may be overridden by having larger content, or you want to set a minimum or preferred width without changing the height, you must override getPreferredSize() in a subclass. E.g.,

menuOne.add(new JMenuItem("1") {
    @Override
    public Dimension getPreferredSize() {
        Dimension d = super.getPreferredSize();
        d.width = Math.max(d.width, 400); // set minimums
        d.height = Math.max(d.height, 300);
        return d;
    }
});