: 前几天在java.sun.com上看见一个用Applet写的菜单程序。由于Applet目前不支持Menu( 据我所知）,: 也许这个程序对你有些帮助。 原来的程序好像不完整，无法编译，我特地到java.sun.com上又载了一个， source如下： /* Copyright: Sun Microsystems 1997. All rights reserved. Author: Patrick Chan (www.xeo.com) 7/19/96 Version: 1.1 */ import java.applet.*; import java.awt.*; import java.util.*; import java.net.*; public class XeoMenu extends Applet { // The background image. This had better not be null. Image image; // These two fields are used to do double-buffering. // The dimensions of bbuf is exactly the dimensions of the applet. Image bbuf; Graphics bbufG; // This field is set to true only when the background image has // completely loaded. boolean imageDone; /* Menu data */ Rectangle[] hitArea; Rectangle[] srcRect; Point[] dstPt; boolean[] down; String[] url; /* Submenu data */ String[][] itemUrl; String[][] item; // If >= 0, this fields holds the index of the current menu. // If -1, no menu is current. int curMenu; // If >= 0, this fields holds the index of the current menu item. // If -1, no menu item is current. int curMenuItem; // This is an array of rectangles - one rectangle for each menu item. // Each rectangle specifies the // location (relative to the left-corner of the applet) of a menu item. // // menuItemRect is null when curMenu is -1. // It becomes non-null when curMenu >= 0. // // Note: it would have been better programming to define classes for // the menu and menu items. However, I decided for this little applet // to keep the number of class files to a minimum to minimize the download // time. Rectangle[] menuItemRect; // This is the color to paint "behind" the image. Color bgColor; // [0] is the text color of a menu item; [1] is the text color of a highlig hted // menu item. Color fgMenuColor[] = new Color[2]; // This is the background of a menu item; [1] is the background color of a // highlighted menu item. Color bgMenuColor[] = new Color[2]; // marginH is the number of pixels on the left and right edges of the menu. // marginV is the number of pixels on the top and bottom edges of the menu. int marginH, marginV; // This is the font used to display the menu item labels. Font f; // This is the font metrics of 'f'. FontMetrics fm; public void init() { int[] ints; // Grab applet parameters. image = getImage(getCodeBase(), getParameter("image")); marginH = Integer.parseInt(getParameter("marginh")); marginV = Integer.parseInt(getParameter("marginv")); // Get color parameters. ints = parseInt(getParameter("bg-color"), " "); bgColor = new Color(ints[0], ints[1], ints[2]); ints = parseInt(getParameter("fg-menu-color"), " "); fgMenuColor[0] = new Color(ints[0], ints[1], ints[2]); ints = parseInt(getParameter("fg-hi-menu-color"), " "); fgMenuColor[1] = new Color(ints[0], ints[1], ints[2]); ints = parseInt(getParameter("bg-menu-color"), " "); bgMenuColor[0] = new Color(ints[0], ints[1], ints[2]); ints = parseInt(getParameter("bg-hi-menu-color"), " "); bgMenuColor[1] = new Color(ints[0], ints[1], ints[2]); // Create back buffer for double-buffering. bbuf = createImage(size().width, size().height); bbufG = bbuf.getGraphics(); // Determine the font from the font-height. int fh = Integer.parseInt(getParameter("font-height")); int i = fh; while (i > 10) { f = new Font(getParameter("font"), Font.PLAIN, i); fm = getFontMetrics(f); if (fm.getHeight() <= fh) { break; } i--; } // Get the menu parameters. for (i=0; ; i++) { if (getParameter("menu"+i) == null) { hitArea = new Rectangle[i]; srcRect = new Rectangle[i]; dstPt = new Point[i]; url = new String[i]; down = new boolean[i]; itemUrl = new String[i][]; item = new String[i][]; break; } } for (i=0; i String[] fields = parse(getParameter("menu"+i), getParameter("separ ator")); // Get the hit area. ints = parseInt(fields[0], " "); hitArea[i] = new Rectangle(ints[0], ints[1], ints[2], ints[3]); // Get the source image. ints = parseInt(fields[1], " "); srcRect[i] = new Rectangle(ints[0], ints[1], ints[2], ints[3]); // Get the destination point. ints = parseInt(fields[2], " "); dstPt[i] = new Point(ints[0], ints[1]); down[i] = fields[3].equals("d"); url[i] = fields[4]; item[i] = new String[(fields.length-5)/2]; itemUrl[i] = new String[(fields.length-5)/2]; for (int j=0; j item[i][j] = fields[j*2+5]; itemUrl[i][j] = fields[j*2+6]; } } } // s is a string containing 'sep' separators. This method // breaks up the string at the separators and returns the resulting // strings in an array. The result may have zero length but is never null. String[] parse(String s, String sep) { StringTokenizer st = new StringTokenizer(s, sep); String result[] = new String[st.countTokens()]; for (int i=0; i result[i] = st.nextToken(); } return result; } // This method is similar to parse() except that the strings are // assumed to be decimal integers. This method coverts these integer // strings into integers and returns them in an array. // The result may have zero length but is never null. int[] parseInt(String s, String sep) { StringTokenizer st = new StringTokenizer(s, sep); int[] result = new int[st.countTokens()]; for (int i=0; i result[i] = Integer.parseInt(st.nextToken()); } return result; } public void paint(Graphics g) { imageDone = false; update(g); } public void update(Graphics g) { Graphics g2; if (!imageDone) { imageDone = g.drawImage(image, 0, 0, this); return; } bbufG.setColor(bgColor); bbufG.fillRect(0, 0, size().width, size().height); bbufG.drawImage(image, 0, 0, this); if (curMenu >= 0) { g2 = bbuf.getGraphics(); // Paint the overlay image g2.clipRect(dstPt[curMenu].x, dstPt[curMenu].y, srcRect[curMenu].width, srcRect[curMenu].height); g2.drawImage(image, dstPt[curMenu].x-srcRect[curMenu].x, dstPt[curMenu].y-srcRect[curMenu].y, this); g2.dispose(); g2 = bbuf.getGraphics(); for (int i=0; i drawMenuItem(g2, i); } g2.dispose(); } g.drawImage(bbuf, 0, 0, this); } void drawMenuItem(Graphics g, int i) { int x, y, w, height; // break the menu item label into lines. String[] line = parse(item[curMenu][i], getParameter("newline")); int hi = 0; if (i == curMenuItem) { hi = 1; getAppletContext().showStatus(itemUrl[curMenu][i]); } g.setColor(bgMenuColor[hi]); g.fillRect(menuItemRect[i].x, menuItemRect[i].y, menuItemRect[i].width, menuItemRect[i].height); // set color for text and box g.setColor(fgMenuColor[hi]); // draw box around menu item. g.drawRect(menuItemRect[i].x, menuItemRect[i].y, menuItemRect[i].width, menuItemRect[i].height); // draw label g.setFont(f); y = menuItemRect[i].y + marginV; for (i=0; i g.drawString(line[i], menuItemRect[i].x+menuItemRect[i].width-fm.stringWidth(line[i]) -marginH, y + fm.getAscent()); y += fm.getHeight(); } } public boolean mouseExit(Event evt, int x, int y) { curMenuItem = curMenu = -1; repaint(); return true; } public boolean mouseEnter(Event evt, int x, int y) { return mouseMove(evt, x, y); } public boolean mouseDown(Event evt, int x, int y) { try { String u = null; if (curMenuItem >= 0 && itemUrl[curMenu].length > 0) { u = itemUrl[curMenu][curMenuItem]; } else if (curMenu >= 0) { u = url[curMenu]; } if (u != null) { URL url = new URL (getDocumentBase(), u); if (getParameter("target") != null) { getAppletContext().showDocument(url, getParameter("target") ); } else { getAppletContext().showDocument(url); } } } catch (Exception e) { e.printStackTrace(); } return true; } public boolean mouseMove(Event evt, int x, int y) { if (curMenu >= 0) { int sm = inMenu(menuItemRect, x, y); if (curMenuItem != sm) { curMenuItem = sm; repaint(); } if (sm >= 0) { return true; } curMenu = -1; } int m = inMenu(hitArea, x, y); if (m != curMenu) { curMenu = m; // A new menu is now active so compute menuItemRect. if (m >= 0) { // Minimum width int maxWidth = 50; int maxHeight = 0; menuItemRect = new Rectangle[item[curMenu].length]; for (int i=0; i String[] line = parse(item[curMenu][i], "^"); for (int j=0; j int w = fm.stringWidth(line[j]); if (w > maxWidth) { maxWidth = w; } } menuItemRect[i] = new Rectangle(); menuItemRect[i].height = parse(item[curMenu][i], "^").length * fm.getHeight() + 2 * marginV; maxHeight += menuItemRect[i].height; } // Determine domain of submenus // Add one extra pixel for the left edge. maxWidth += 2 * marginH + 1; if (down[m]) { y = Math.max(0, Math.min(size().height-maxHeight-1, dstPt[curMenu].y + srcRect[curMenu].height-1)); } else { y = Math.max(0, Math.min(size().height-maxHeight-1, dstPt[curMenu].y - maxHeight)); } x = dstPt[curMenu].x + srcRect[curMenu].width-maxWidth-1; for (int i=0; i menuItemRect[i].x = x; menuItemRect[i].y = y; menuItemRect[i].width = maxWidth; y += menuItemRect[i].height; } getAppletContext().showStatus(url[curMenu]); } } repaint(); } return true; } // Returns the index of the rectangle in rs containing x and y. // Returns -1 if either rs is null or x and y is not in rs. int inMenu(Rectangle[] rs, int x, int y) { if (rs != null) { for (int i=0; i if (rs[i].inside(x, y)) { return i; } } } return -1; } } -- 风雨送春归 .-+-. 飞雪迎春到 ___) | (___ 已是悬崖万丈冰 `---' 犹有花枝俏 ※ 来源:?日月光华站 bbs.fudan.edu.cn?[FROM: ms]