java - 如何使用 Java 中的 JButton 操作调整 JWindow 的宽度和高度？

Question

如何通过 JButton 操作调整 JWindow 的高度(我尝试了 setSize 和 repaint 但它不起作用)？

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

例如

请不要在 EDT 期间使用 Thread.sleep(int)，如本代码示例所示，它用于关闭当前 JVM 实例，否则该实例永远不会从 PC 的 RAM 中消失

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() {
    }
}