Java Swing How to - Layout with SpringLayout

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Question

We would like to know how to layout with SpringLayout.

Answer

import static javax.swing.SpringLayout.EAST;
import static javax.swing.SpringLayout.SOUTH;
import static javax.swing.SpringLayout.WIDTH;
/*www. j a  v a2s.  co  m*/
import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Spring;
import javax.swing.SpringLayout;
import javax.swing.SwingConstants;
import javax.swing.WindowConstants;

public class Main {
  public static void main(String[] args) {
    SpringLayout layout = new SpringLayout();
    JPanel p = new JPanel(layout);
    p.setBorder(BorderFactory.createLineBorder(Color.GREEN, 10));

    JLabel l1 = new JLabel("label: width=90%", SwingConstants.CENTER);
    l1.setBorder(BorderFactory.createLineBorder(Color.RED, 1));
    JButton l2 = new JButton("button: width=50%");

    Spring panelw = layout.getConstraint(WIDTH, p);

    SpringLayout.Constraints c1 = layout.getConstraints(l1);
    c1.setX(Spring.constant(0));
    c1.setY(Spring.constant(20));
    c1.setWidth(Spring.scale(panelw, 0.9f));
    p.add(l1);

    SpringLayout.Constraints c2 = layout.getConstraints(l2);
    c2.setWidth(Spring.scale(panelw, 0.5f));
    layout.putConstraint(SOUTH, l2, -20, SOUTH, p);
    layout.putConstraint(EAST, l2, -20, EAST, p);
    p.add(l2);

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(p);
    f.setSize(320, 240);
    f.setVisible(true);
  }
}

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