Colorizing a Box

[Dan Howard]

Hi All,

I tried to use a Box in my BoxLayout and it lays out OK but I can't seem to change it's color. Any ideas?

        
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        JLabel label = new JLabel("Option");
        label.setAlignmentX(Component.LEFT_ALIGNMENT);
        panel.add(label);
        panel.setBackground(Color.DARK_GRAY);

        JLabel a = new JLabel ("A");
        JLabel b = new JLabel ("B");
        JLabel c = new JLabel ("C");
        JLabel d = new JLabel ("D");
        JLabel e = new JLabel ("E");

        Box box = Box.createVerticalBox();
        box.setBackground(Color.DARK_GRAY);
        box.add(a);
        box.add(b);
        box.add(c);
        box.add(d);
        box.add(e);

        JScrollPane jscrlpBox = new JScrollPane(box);
        jscrlpBox.setAlignmentX(Component.LEFT_ALIGNMENT);
        
        jscrlpBox.setPreferredSize(new Dimension(140, 90));
        panel.add(jscrlpBox);

[pete stein]

Are Box's opaque? I'm betting not.

[Dan Howard]

Opacity of course!
Thanks!

[Brian Cole]

pete stein wrote:Are Box's opaque? I'm betting not.

One thing you might (or might not) have to worry about is that
until JDK4 Box wasn't even a Component. (It was a direct subclass
of Container.) As such, it doesn't have a setOpaque() method
when running under JDK1.3.1 or earlier: NoSuchMethodError

If this is a problem, you could instead set a BoxLayout on a JPanel.

[Dan Howard]

Good to know. But I'm on Java 6 so I should be good.