在Java Swing中创建透明的JFrame [英] Create a transparent JFrame in java swing

问题描述

大家好，我在Java中制作了一个swing应用程序，但问题是我如何才能在Java中实现透明框架.

Hello everyone im made a swing application in java, but problem is that how i can achive the transparent frame in java.

我想像附加图像中那样进行用户界面设计，但是探针是框架不是透明的，因此如果该层上没有组件，它将显示默认颜色.

I want to make a user interface design as in attach image, but probem is that frames is not transparent, so it showing the default color if there is no components on that layer.

就像在右侧，我想将此框架显示为顶部自由和底部自由的透明部分，

Like on the right side i want to show this frame as a transparent on the top free and bottom free portion,

我使用AWTUtilities，但不适用于我.

I use AWTUtilities, but it not works for me.

我该怎么做，请回复，

还给了我一个提示，可以在未装饰的窗口中按标题栏拖动窗口

also give me a hint to drag the window by title bar, in undecorated window

提前感谢

推荐答案

透明背景组件

public class TransparentBackground extends Jcomponent { 
    private JFrame frame; 
    private Image background;

public TransparentBackground(JFrame frame) {
    this.frame = frame;
    updateBackground( );
}

public void updateBackground( ) {
    try {
        Robot rbt = new Robot( );
        Toolkit tk = Toolkit.getDefaultToolkit( );
        Dimension dim = tk.getScreenSize( );
        background = rbt.createScreenCapture(
        new Rectangle(0,0,(int)dim.getWidth( ),
                          (int)dim.getHeight( )));
    } catch (Exception ex) {
        p(ex.toString( ));
        ex.printStackTrace( );
    }
}
public void paintComponent(Graphics g) {
    Point pos = this.getLocationOnScreen( );
    Point offset = new Point(-pos.x,-pos.y);
    g.drawImage(background,offset.x,offset.y,null);
}
}

您可以使用简单的main()方法来运行它，将一些组件放到面板上并将其放入框架中:

You can run this with a simple main( ) method, dropping a few components onto the panel and putting it into a frame:

public static void main(String[] args) {
    JFrame frame = new JFrame("Transparent Window");
    TransparentBackground bg = new TransparentBackground(frame);
    bg.setLayout(new BorderLayout( ));
    JButton button = new JButton("This is a button");
    bg.add("North",button);
    JLabel label = new JLabel("This is a label");
    bg.add("South",label);
    frame.getContentPane( ).add("Center",bg);
    frame.pack( );
    frame.setSize(150,100);
    frame.show( );
}

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