Java透明窗口 [英] Java transparent window

问题描述

我正在尝试创建一个跟随鼠标的圆形窗口，并将点击传递给底层窗口。

I am trying to create a circle-shaped window that follows the mouse and pass clicks to the underlying windows.

我是用Python和Qt做的（见 Python覆盖窗口）但随后我切换到Java和Swing。但是我无法使窗口透明。我试过这种方法，但它不起作用，不过我认为我的系统支持透明度，因为如果我开始 Screencast-O-Matic （这是在Java中，矩形实际上是透明的。

I was doing this with Python and Qt (see Python overlay window) but then I switched to Java and Swing. However I'm not able to make the window transparent. I tried this method but it doesn't work, however I think that my system supports the transparency because if I start Screencast-O-Matic (which is in Java), the rectangle is actually transparent.

我怎样才能实现这样的目标？ （我在Linux KDE4上）

How can I achieve something like that? (I'm on Linux KDE4)

推荐答案

为什么Java教程如何创建半透明和形状的Windows 无效？您使用的是最新版本的Java 6还是Java 7？
在 Java杂志的5月/ 6月刊中，有一个有关需要java的形状和透明窗口的教程7.您可能需要注册Java杂志才能阅读它。看看你是否可以在你的系统上运行它：

Why did the Java tutorial How to Create Translucent and Shaped Windows fail to work? Are you using the latest version of Java 6 or Java 7? In the May/June issue of Java Magazine, there was a tutorial on shaped and transparent windows requiring java 7. You will probably need to sign up for Java magazine in order to read it. See if you can get this to run on your system:

import java.awt.*; //Graphics2D, LinearGradientPaint, Point, Window, Window.Type;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
 * From JavaMagazine May/June 2012
 * @author josh
 */
public class ShapedAboutWindowDemo {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //switch to the right thread
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame("About box");
                //turn of window decorations
                frame.setUndecorated(true);
                //turn off the background
                frame.setBackground(new Color(0,0,0,0));
                frame.setContentPane(new AboutComponent());
                frame.pack();
                //size the window
                frame.setSize(500, 200);
                frame.setVisible(true);
                //center on screen
                frame.setLocationRelativeTo(null);
            }
        }
        );
    }

    private static class AboutComponent extends JComponent {
        public void paintComponent(Graphics graphics) {
            Graphics2D g = (Graphics2D) graphics;

            //create a translucent gradient
            Color[] colors = new Color[]{
                           new Color(0,0,0,0)
                            ,new Color(0.3f,0.3f,0.3f,1f)
                            ,new Color(0.3f,0.3f,0.3f,1f)
                            ,new Color(0,0,0,0)};
            float[] stops = new float[]{0,0.2f,0.8f,1f};
            LinearGradientPaint paint = new LinearGradientPaint(
                                        new Point(0,0), new Point(500,0),
                                        stops,colors);
            //fill a rect then paint with text
            g.setPaint(paint);
            g.fillRect(0, 0, 500, 200);
            g.setPaint(Color.WHITE);
            g.drawString("My Killer App", 200, 100);
        }
    }
}

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