1). 前提(condition)+ jedit4.2final+ jdk 1.42). 步骤(steps)1. add this at org.gjt.sp.jedit.textarea.TextAreaPainterin method paintComponent(…)after: extensionMgr.paintScreenLineRange(textArea, gfx, firstInvalid, lastInvalid, y, height);add: { // paint wallpaper after all that should be paint Rectangle rect = this.getVisibleRect(); Wallpaper.paintWallpaper(gfx, rect.x, rect.y, rect.width, rect.width, this); } 2. add in org.gjt.sp.jedit.textarea.JEditTextArea // {{{ changeWallpaperDialog() method // for change the wallpaper /** * Displays the ‘changeWallpaperDialog’ dialog box. * @author neoedmund */ public void changeWallpaperDialog() { if (Wallpaper.changeWallpaper(this)){ repaint(); } } //}}}3. add new class org.gjt.sp.jedit.textarea.Wallpaper/* * Created on 2005-3-26 */package org.gjt.sp.jedit.textarea;import java.awt.AlphaComposite;import java.awt.Composite;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import javax.imageio.ImageIO;import javax.swing.JComponent;import javax.swing.JFileChooser;/** * @author neoe */public class Wallpaper { static BufferedImage pic; private static final String DEFALUT_IMG = "org/gjt/sp/jedit/icons/wallpaper.jpg"; static{ System.out.println("hello Wallpaper"); loadPic(ClassLoader .getSystemResourceAsStream(DEFALUT_IMG)); } static AlphaComposite alpha = AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 0.2f); /** * @param gfx * @param width * @param height */ public static void paintWallpaper(Graphics2D g, int cx, int cy, int width, int height, JComponent view) { if (pic==null){ return; } int y = 0; int w = pic.getWidth(); int h = pic.getHeight(); Composite old = g.getComposite(); g.setComposite(alpha); while (true) { int x = 0; while (true) { g.drawImage(pic, cx+x, cy+y, view); x += w; if (w <= 0 || x >= width) { break; } } y += h; if (h <= 0 || y >= height) { break; } } g.setComposite(old); } /** * @param in */ private static void loadPic(InputStream in) { try { pic = ImageIO.read(in); } catch (IOException e) { e.printStackTrace(); } } static File f; /** * */ public static boolean changeWallpaper(JComponent parent) { JFileChooser jfc = new JFileChooser(f); int returnVal = jfc.showOpenDialog(parent); if (returnVal == JFileChooser.APPROVE_OPTION) { f = jfc.getSelectedFile(); try { loadPic(new FileInputStream(f)); return true; } catch (IOException e1) { e1.printStackTrace(); } } return false; }}4. copy default wallpaper whatever you like into org/gjt/sp/jedit/icons/wallpaper.jpg5. add this into org/gjt p/jedit/actions.xml<ACTION NAME="change-wallpaper"> <CODE> textArea.changeWallpaperDialog(); </CODE></ACTION>6. change org/gjt p/jedit/jedit_gui.props, add "change-wallpaper" in tool bar#{{{ Tool barview.toolbar=new-file open-file close-buffer save – print page-setup – / undo redo cut copy paste – find find-next – new-view unsplit / split-horizontal split-vertical – buffer-options global-options – / plugin-manager – help – change-wallpaper………change-wallpaper.icon=Help.png……..change-wallpaper.label=Change $Wallpaper7. last step, rebuild source, restart jedit, have fun. notes: I don`t know if it is something slowdown, but I like it 
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