嵌套JPanel中的背景图像？ [英] Background image in a nested JPanel?

问题描述

我有一个JPanel，其中包含2个JPanel。位于左侧（左侧）和右侧（rB），我想在右侧JPanel（rB）上添加背景图像。

I have a JPanel which contains 2 more JPanel. Located on the left(leftBox) and the right(rB), I wanted to add a background image on the right JPanel (rB).

但我得到的结果是

http：/ /i.imgur.com/tHz1x.jpg

我想要的结果

http://i.imgur.com/xHbpx。 jpg

public void paintComponent(Graphics g)
{
    //this.paintComponent(g);
    if(wdimage != null) g.drawImage(wdimage,0,0,800,800,rB); //(image,location x, location y, size x, size y)

}

rB Panel正在阻止图像，我想要的是在JPanel上显示图像，并在JPanel上添加一些jlabels和文本字段，稍后再添加图像。

The rB Panel is blocking the image, what I want is to display the image on the JPanel, and add some jlabels and text field on top of the JPanel and image later on.

推荐答案

这里出现没有任何问题，看看：

Here it's appearing without any problems, have a look :

import java.awt.*;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;

public class PanelExample
{
    private void createAndDisplayGUI()
    {
        JFrame frame = new JFrame("Panel Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel contentPane = new JPanel();
        contentPane.setOpaque(true);
        contentPane.setBorder(
                    BorderFactory.createMatteBorder(
                                    5, 5, 5, 5, Color.WHITE));
        contentPane.setBackground(Color.WHITE);
        contentPane.setLayout(new BorderLayout(10, 10));

        ImagePanel imagePanel = new ImagePanel();
        //imagePanel.createGUI();
        BlankPanel blankPanel = new BlankPanel();

        contentPane.add(blankPanel, BorderLayout.LINE_START);
        contentPane.add(imagePanel, BorderLayout.CENTER);
        frame.setContentPane(contentPane);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new PanelExample().createAndDisplayGUI();
            }
        });
    }
}

class ImagePanel extends JPanel
{
    private BufferedImage image;

    public ImagePanel()
    {
        setOpaque(true);
        setBorder(BorderFactory.createLineBorder(Color.BLACK, 5));
        try
        {
            image = ImageIO.read(new URL("http://gagandeepbali.uk.to/gaganisonline/images/background.jpg"));
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        createGUI();
    }

    public void createGUI()
    {
        setLayout(new GridBagLayout());
        JPanel loginPanel = new JPanel();
        loginPanel.setOpaque(false);
        loginPanel.setLayout(new GridLayout(2, 2, 2, 2));
        JLabel userLabel = new JLabel("USERNAME : ");
        userLabel.setForeground(Color.WHITE);
        JTextField userField = new JTextField(10);
        JLabel passLabel = new JLabel("PASSWORD : ");
        passLabel.setForeground(Color.WHITE);
        JPasswordField passField = new JPasswordField(10);

        loginPanel.add(userLabel);
        loginPanel.add(userField);
        loginPanel.add(passLabel);
        loginPanel.add(passField);

        add(loginPanel);
        System.out.println("I am finished");
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(300, 300));
    }

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, this);
    }
}

class BlankPanel extends JPanel
{
    public BlankPanel()
    {
        setOpaque(true);
        setBorder(BorderFactory.createLineBorder(Color.BLACK, 5));
        setBackground(Color.WHITE);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(100, 300));
    }
}

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