如何更改jdesktoppane默认背景图片？

问题描述

如何使用java netbeans在MDI（多文档界面）中更改jdesktoppane背景图像？意味着我将jdesktoppane添加到java MDI中，所以现在我要更改我在java MDI中使用的jdesktoppane的默认背景图像。有什么简单的方法吗？

How to change jdesktoppane background image in MDI (Multiple Documents interface) using java netbeans? Means I added the jdesktoppane to java MDI so now I want to change default background image of that jdesktoppane which I'm using in java MDI. Any easy way?

检查附加的快照链接可能会让你更好地理解我的问题。

Check attached snapshot link may be you will better understand my question what I want.

推荐答案

+1给MadProgrammers评论。

+1 to MadProgrammers comment.

只需覆盖 JDesktopPane paintComponent（..）并调用 drawImage（Image img，int x，int y，ImageObserver io）来绘制图像。

Simply override JDesktopPane paintComponent(..) and call drawImage(Image img,int x,int y,ImageObserver io) to draw an image.

别忘了尊重油漆链并致电 super.paintComponent（g）作为第一次调用重写 paintComponent（..）方法

Dont forget to honor the paint chain and call super.paintComponent(g) as first call in overridden paintComponent(..) method

以下是一个例子：

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;

public class JInternalFrameDemo {

    private JDesktopPane jdpDesktop;
    private static int openFrameCount = 0;
    private BufferedImage img;

    public JInternalFrameDemo() {
        JFrame frame = new JFrame("JInternalFrame Usage Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        try {
            img = ImageIO.read(new URL("http://images1.wikia.nocookie.net/__cb20120817224359/villains/images/6/6a/Nine-Tailed_Fox_(Naruto).jpg"));
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        // A specialized layered pane to be used with JInternalFrames
        jdpDesktop = new JDesktopPane() {
            @Override
            protected void paintComponent(Graphics grphcs) {
                super.paintComponent(grphcs);
                grphcs.drawImage(img, 0, 0, null);
            }

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(img.getWidth(), img.getHeight());
            }
        };



        createFrame(); // Create first window

        frame.setContentPane(jdpDesktop);

        frame.setJMenuBar(createMenuBar());

        // Make dragging faster by setting drag mode to Outline
        jdpDesktop.putClientProperty("JDesktopPane.dragMode", "outline");

        frame.pack();
        frame.setVisible(true);
    }

    protected JMenuBar createMenuBar() {
        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("Frame");
        menu.setMnemonic(KeyEvent.VK_N);
        JMenuItem menuItem = new JMenuItem("New IFrame");
        menuItem.setMnemonic(KeyEvent.VK_N);
        menuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                createFrame();
            }
        });
        menu.add(menuItem);
        menuBar.add(menu);
        return menuBar;
    }

    protected void createFrame() {
        MyInternalFrame frame = new MyInternalFrame();
        frame.setVisible(true);
        // Every JInternalFrame must be added to content pane using JDesktopPane
        jdpDesktop.add(frame);
        try {
            frame.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new JInternalFrameDemo();
            }
        });
    }

    class MyInternalFrame extends JInternalFrame {

        static final int xPosition = 30, yPosition = 30;

        public MyInternalFrame() {
            super("IFrame #" + (++openFrameCount), true, // resizable
                    true, // closable
                    true, // maximizable
                    true);// iconifiable
            setSize(300, 300);
            // Set the window's location.
            setLocation(xPosition * openFrameCount, yPosition
                    * openFrameCount);
        }
    }
}

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