import javax.swing.*;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.Rectangle;

public class ResizableDecorator extends JComponent {

  // decorated component
  protected JComponent child;
  private JButton button = new JButton();
  boolean minimum = false;
  private Rectangle r;

  public ResizableDecorator(JComponent component) {
    child = component;
    this.setLayout(new BorderLayout());
    this.add(child);
    child.setLayout(null);
    button.setBounds(0, 0, 8, 8);
    child.add(button);
    button.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button_actionPerformed(e);
      }
    });
  }

  void button_actionPerformed(ActionEvent e) {
    if (minimum) {
      this.setBounds(r);
    }
    else {
      r = this.getBounds();
      this.setBounds(r.x, r.y, 8, 8);
    }
    minimum = !minimum;
  }

}