如何更改jdesktoppane默认背景图片？

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，所以现在我想更改我在java MDI中使用的jdesktoppane的默认背景图像。 任何简单的方法？

检查附加的快照链接可能是您将更好地了解我的问题我想要什么。

http://sofzh.miximages.com/java/iml1e9.jpg

Answer 1

+1给MadProgrammers评论。

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

别忘了尊重paint链并调用super.paintComponent(g)作为重写的paintComponent(..)方法中的第一个调用

这是一个例子：

 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); } } } 

Answer 2

我在一个单独的函数中解决它来创建一个桌面对象。

代码如下

 private JDesktopPane intializeDesktop(JDesktopPane mydesktop,String imagePath,int scalx,int scaly) { // A specialized layered pane to be used with JInternalFrames mydesktop = new JDesktopPane() { ImageIcon icon = new ImageIcon(imagePath); Image image = icon.getImage(); Image newimage = image.getScaledInstance(scalx, scaly, Image.SCALE_SMOOTH); @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(newimage, 0, 0, this); } }; return mydesktop; }