Change font size of a JPanel and all its elements

Question

I am trying to create a Swing panel whose elements have a different font size than the rest of the swing application. Initially, using setFont for a couple of c

Answer 1

You could use this trick:

import java.awt.*;

public class FrameTest {

    public static void setUIFont(FontUIResource f) {
        Enumeration keys = UIManager.getDefaults().keys();
        while (keys.hasMoreElements()) {
            Object key = keys.nextElement();
            Object value = UIManager.get(key);
            if (value instanceof FontUIResource) {
                FontUIResource orig = (FontUIResource) value;
                Font font = new Font(f.getFontName(), orig.getStyle(), f.getSize());
                UIManager.put(key, new FontUIResource(font));
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {

        setUIFont(new FontUIResource(new Font("Arial", 0, 20)));

        JFrame f = new JFrame("Demo");
        f.getContentPane().setLayout(new BorderLayout());

        JPanel p = new JPanel();
        p.add(new JLabel("hello"));
        p.setBorder(BorderFactory.createTitledBorder("Test Title"));

        f.add(p);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(300, 300);
        f.setVisible(true);
    }
}

Produces:

Answer 2

you could override the add method on your base component and apply the font to the added components and their children there. this would save you applying the font manually when components are added later.