Michael Michael - 1 year ago 66
Java Question

Swing Component - disabling resize in layout

I have a custom GUI compomemt, which is based on Swing's JPanel. This component is placed in a JFrame, that uses BorderLayout. When I resize the frame, this component keeps resizing. How can I avoid this? I would like the component to keep the same size whatever happens. I've tried setSize, setPreferredSize, setMinimumSize with no success.

Thanks in advance!


Answer Source

You have a few options:

  • Nest the component in an inner panel with a LayoutManager that does not resize your component

  • Use a more sophisticated LayoutManager than BorderLayout. Seems to me like GridBagLayout would suit your needs better here.

Example of the first solution:

import java.awt.*;
import javax.swing.*;

public class FrameTestBase extends JFrame {

    public static void main(String args[]) {
        FrameTestBase t = new FrameTestBase();

        JPanel mainPanel = new JPanel(new BorderLayout());

        // Create some component
        JLabel l = new JLabel("hello world");

        JPanel extraPanel = new JPanel(new FlowLayout());
        l.setPreferredSize(new Dimension(100, 100));

        // Instead of adding l to the mainPanel (BorderLayout),
        // add it to the extra panel

        // Now add the extra panel instead of l
        mainPanel.add(extraPanel, BorderLayout.CENTER);


        t.setSize(400, 200);


enter image description here

Green component placed in BorderLayout.CENTER, red component maintains preferred size.

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