Question

How to resize the height of JWindow from JButton actions (i tried setSize and repaint but it does not work) ?

public class Gui extends JWindow implements KeyListener
{
  public static Gui mystatic;  
  private static JPanel panelBgImg;
  private final Dimension screen;
  public static int w = 0;
  public static int h = 0;

  public void paintComponent(Graphics g) 
  {
  }

  public Dimension getPreferredSize() 
  {      
      return new Dimension(100, h);
  }

  public Gui()
  {
    ....

    /* Button 1 */
    JButton jb2 = new JButton("")  
    {
        public Dimension getPreferredSize() 
        {
          return new Dimension(50,50);
        }            
    };
    jb2.setOpaque(false);
    jb2.setContentAreaFilled(false);
    jb2.setBorderPainted(false);

    jb2.addActionListener(new ActionListener() 
    {                
      public void actionPerformed(ActionEvent e) 
      {
         h = 100;         
         /* HERE i am trying to resize the JWindow itself but not working
               return new Dimension(100, h); */
         mystatic.setSize(screen.width, 100);
         mystatic.repaint();
      }
    });

    ...

}

Answer 1

for example

please don’t use Thread.sleep(int) durring EDT, as demonstrated in this code example, there is used for closing current JVM instance, otherwise this instance never gone from PC’s RAM

import java.util.logging.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.event.*;

public class SSCCE {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        final JWindow window = new JWindow();
        final JPanel windowContents = new JPanel();
        JLabel label = new JLabel("A window that is pushed into view..........");
        windowContents.add(label);
        window.add(windowContents);
        window.pack();
        window.setLocationRelativeTo(null);
        final int desiredWidth = window.getWidth();
        window.getContentPane().setLayout(null);
        window.setSize(0, window.getHeight());
        window.setVisible(true);
        Timer timer = new Timer(15, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                int newWidth = Math.min(window.getWidth() + 1, desiredWidth);
                window.setSize(newWidth, window.getHeight());
                windowContents.setLocation(newWidth - desiredWidth, 0);
                if (newWidth >= desiredWidth) {
                    ((Timer) e.getSource()).stop();
                    //restore original layout
                    window.getContentPane().setLayout(new BorderLayout());
                    window.validate();
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(SSCCE.class.getName()).log(Level.SEVERE, null, ex);
                    }
                    System.exit(0);
                }
            }
        });
        timer.start();
    }

    private SSCCE() {
    }
}