java - 如何在启动画面上显示 jbutton

Question

如何将按钮添加到启动画面

嗨，我必须创建 java splashscreen在飞溅过程中，它会停止/暂停并显示确定按钮。每次编译 netbean 时，我都会运行启动画面。

public class Main
{
  static SplashScreen mySplash;    // instantiated by JVM we use it to
                                   // get graphics
 static Graphics2D splashGraphics;  // graphics context for overlay of the
                                   // splash image
 static Rectangle2D.Double splashTextArea;       // area where we draw the text

 static Rectangle2D.Double splashProgressArea;   // area where we draw the progress bar

 static Font font;                               // used to draw our text

 public static void main(String[] args)
 {
   splashInit();           // initialize splash overlay drawing parameters

}

 //create button here
 private static void splashInit()
{

  //do coding here for mannipulating splash screen
  //put ok button here

 }
}

我们怎么可能把按钮放到闪屏上？通常我只能把JButton放在JFrame或者JPanel上。是否可以在启动画面等图像上放置按钮？

引用:Splashscreen beginner netbean

Answer 1

"Can you kind enough to instruct me on how to make jdialog as splash screen? "

在下面的示例中，这是我所做的事情。

• 创建一个JDialog 类并确保它是未修饰的

  public class SplashDialog extends JDialog {
      ....
      setUndecorated(true);
  

• 给它一个背景图片

  JLabel background = new JLabel(createImage());
  background.setLayout(new BorderLayout());
  setContentPane(background);
  

• 将带有JButton 的JPanel 添加到背景。但是将 JPanel 设置为不可见，也只是为了添加一些样式，给 JPanel 一点透明度，所以当您确实将它设置为可见时，你仍然可以看到背景图像

  final JPanel panel = new JPanel(new GridBagLayout());
  panel.setVisible(false);
  panel.setBackground(new Color(0, 0, 0, 150));
  JButton okBut = new JButton("OK");
  panel.add(okBut);
  background.add(panel);
  

• 使用 javax.swing.Timer 设置按钮出现的延迟。

  Timer timer = new Timer(5000, new ActionListener(){
      public void actionPerformed(ActionEvent e) {
          panel.setVisible(true);
      }
  });
  timer.setRepeats(false);
  timer.start();
  

• 确保框架不可见，但是当按下按钮时，框架变得可见并且 JDialog 处理

  okBut.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e) {
          dispose();
          parent.setVisible(true);
      }
  });
  

现在你有了一个简单的斜杠屏幕

初始启动

5 秒后飞溅

import java.awt.*;
import java.awt.event.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.*;
import javax.swing.*;

public class SplashDialogDemo {

    public SplashDialogDemo() {
        JPanel panel = new JPanel() {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(400, 400);
            }
        };
        panel.setBackground(Color.BLACK);

        JFrame frame = new JFrame();
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBackground(Color.BLACK);
        frame.pack();
        frame.setLocationRelativeTo(null);

        SplashDialog splash = new SplashDialog(frame, true);
    }

    public class SplashDialog extends JDialog {

        public SplashDialog(final JFrame parent, boolean modal) {
            super(parent, modal);

            JLabel background = new JLabel(createImage());
            background.setLayout(new BorderLayout());
            setContentPane(background);

            final JPanel panel = new JPanel(new GridBagLayout());
            panel.setVisible(false);
            panel.setBackground(new Color(0, 0, 0, 150));
            JButton okBut = new JButton("OK");
            panel.add(okBut);
            background.add(panel);

            okBut.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    dispose();
                    parent.setVisible(true);
                }
            });

            Timer timer = new Timer(5000, new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    panel.setVisible(true);
                }
            });
            timer.setRepeats(false);
            timer.start();

            addWindowListener(new WindowAdapter() {
                @Override
                public void windowClosing(WindowEvent e) {
                    System.exit(0);
                }
            });

            setUndecorated(true);
            pack();
            setLocationRelativeTo(parent);
            setVisible(true);
        }

        private ImageIcon createImage() {
            ImageIcon icon = null;
            try {
                URL url = new URL("http://www.iconsdb.com/icons/download/black/stackoverflow-2-256.png");
                icon = new ImageIcon(url);
            } catch (MalformedURLException ex) {
                Logger.getLogger(SplashDialogDemo.class.getName()).log(Level.SEVERE, null, ex);
            }
            return icon;
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    Logger.getLogger(SplashDialogDemo.class.getName()).log(Level.SEVERE, null, ex);
                }
                new SplashDialogDemo();
            }
        });
    }
}