我正尝试使用VLCJ构建自己的视频播放器，但是我遇到了问题。将JPanel背景设置为透明

我的代码是

import java.awt.*;

import javax.swing.*;

import com.sun.jna.*;

import uk.co.caprica.vlcj.component.*;

import uk.co.caprica.vlcj.runtime.*;

public class MainFrame extends JFrame {

public MainFrame(String vlcPath, String username) {

super("Player");

setSize(1366,700);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

NativeLibrary.addSearchPath(RuntimeUtil.getLibVlcLibraryName(), vlcPath);

EmbeddedMediaPlayerComponent player = new EmbeddedMediaPlayerComponent();

setContentPane(player);

JPanel panel = new JPanel();

player.add(panel, BorderLayout.EAST);

Dimension d = new Dimension(300,200);

panel.setOpaque(false);

panel.setLayout(null);

panel.setPreferredSize(d);

panel.setSize(d);

setVisible(true);

player.getMediaPlayer().playMedia("path to video");

}

}

现在，你可以看到，我想视频播放器是在整个屏幕上，我想在右侧透明背景的叠加。

此代码给我下面的：

的JPanel的背景是由于某种原因黑色，不透明。我尝试创建自己的类来扩展JPanel并重写paintComponent(Graphics g)，但结果是一样的。

问题是，我怎样才能使它透明？

2014-12-21

vsakos

I need to know if a JPanel`s bacground can be set to Transparent?

My frame is has two Jpanels

Image Panel and Feature Panel, Feature Panel is overlapping Image Panel, the Image Panel is working as a background and it is loading image from a remote Url, now I want to draw shaps on Feature Panel , but now Image Panel cannot be seen due to Feature Panel's background color. I need to make Feature Panel background transparent while still drawing its shapes and i want Image Panel to be visible since it is doing tiling and cache function of images. I need to seperate the image drawing and shape drawing thats why I`m using two jPanels! is there anyway the overlapping Jpanel have a transparent background?

thanks

解决方案

Alternatively, consider The Glass Pane, discussed in the article How to Use Root Panes. You could draw your "Feature" content in the glass pane's paintComponent() method.

Addendum: Working with the GlassPaneDemo, I added an image:

/* Set up the content pane, where the "main GUI" lives. */

frame.add(changeButton, BorderLayout.SOUTH);

frame.add(new JLabel(new ImageIcon("img.jpg")), BorderLayout.CENTER);

and altered the glass pane's paintComponent() method:

protected void paintComponent(Graphics g) {

if (point != null) {

Graphics2D g2d = (Graphics2D) g;

g2d.setRenderingHint(

RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2d.setComposite(AlphaComposite.getInstance(

AlphaComposite.SRC_OVER, 0.3f));

g2d.setColor(Color.yellow);

g2d.fillOval(point.x, point.y, 120, 60);

}

}