java 如何制作透明的 JFrame 但保持其他一切不变？
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How to make a transparent JFrame but keep everything else the same?
提问by r1nzler
I want to make the JFrametransparent, but the image on top of it to be non-transparent. This is what I have now:
我想让它JFrame透明，但它上面的图像是不透明的。这就是我现在所拥有的：
Does anyone know a way to make only the JFrametransparent?
有谁知道只制作JFrame透明的方法？
Here's my code:
这是我的代码：
import javax.swing.*;
import java.awt.*;
import com.sun.awt.AWTUtilities;
import static java.awt.GraphicsDevice.WindowTranslucency.*;
public class SplashDemo extends JFrame
{
public SplashDemo()
{
setUndecorated(true);
setSize(200, 200);
add(new JLabel(new ImageIcon("puppy2.png")));
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
setOpacity(0.85f);
}
public static void main(String[] args)
{
new SplashDemo();
}
}
回答by MadProgrammer
Basically, you need to make a transparent window and a translucent content pane. This will mean anything added to the content pane will continue to be rendered without additional alphering...
基本上，您需要制作一个透明的窗口和一个半透明的内容窗格。这意味着添加到内容窗格的任何内容都将继续呈现而无需额外的 alphering...
public class TranscluentWindow {
public static void main(String[] args) {
new TranscluentWindow();
}
public TranscluentWindow() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JWindow frame = new JWindow();
frame.setAlwaysOnTop(true);
frame.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
SwingUtilities.getWindowAncestor(e.getComponent()).dispose();
}
}
});
frame.setBackground(new Color(0,0,0,0));
frame.setContentPane(new TranslucentPane());
frame.add(new JLabel(new ImageIcon(ImageIO.read(getClass().getResource("/Puppy.png")))));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
}
public class TranslucentPane extends JPanel {
public TranslucentPane() {
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(0.85f));
g2d.setColor(getBackground());
g2d.fillRect(0, 0, getWidth(), getHeight());
}
}
}
