Java模拟Windows开始菜单

package windowcomponents;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.GradientPaint;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.Insets;

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JPopupMenu;

public class WindowsStartMenuSimulation {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

DemoWindow15 dw = new DemoWindow15("模拟Windows开始菜单");

dw.setBounds(dw.getToolkit().getScreenSize().width / 3, dw.getToolkit()

.getScreenSize().height / 3,

dw.getToolkit().getScreenSize().width / 3, dw.getToolkit()

.getScreenSize().height / 3);

dw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

dw.setVisible(true);

}

}

class DemoWindow15 extends JFrame implements ActionListener {

// 菜单项图片

Image updateImage = new ImageIcon("images/update.gif").getImage();

Image programImage = new ImageIcon("images/program.gif").getImage();

Image documentImage = new ImageIcon("images/document.gif").getImage();

Image setImage = new ImageIcon("images/set.gif").getImage();

Image findImage = new ImageIcon("images/find.gif").getImage();

Image helpImage = new ImageIcon("images/help.gif").getImage();

Image runImage = new ImageIcon("images/run.gif").getImage();

Image logoutImage = new ImageIcon("images/logout.gif").getImage();

Image shutdownImage = new ImageIcon("images/shutdown.gif").getImage();

// 按钮图片

ImageIcon windowsImage = new ImageIcon("images/windows.gif");

// “开始”按钮

JButton jb = new JButton("开始", windowsImage);

StartMenu sm = new StartMenu();

// 布局面板

JPanel jp1 = new JPanel();

JPanel jp2 = new JPanel();

ImageMenu1 im = null;

public DemoWindow15(String title) {

super(title);

jb.setFont(new Font("宋体", Font.BOLD, 18));

jp2.setLayout(new BorderLayout());

jp2.add(jb, BorderLayout.WEST);

add(jp1, BorderLayout.CENTER);

add(jp2, BorderLayout.SOUTH);

im = new ImageMenu1("Windows Update", updateImage); im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("程序", programImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("文档", documentImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("设置", setImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("搜索", findImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("帮助和支持", helpImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("运行", runImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("注销", logoutImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

im = new ImageMenu1("关机", shutdownImage);

im.setFont(new Font("宋体", Font.BOLD, 22));

sm.add(im);

// 添加事件监听器

jb.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

// 设置菜单可见，获得菜单的高度，便于下一步设置菜单的位置

sm.setVisible(true);

// 显示图片菜单，通过位置设置，显示向上弹出的效果

sm.show(jp1, 0, jp1.getHeight() - sm.getHeight());

}

}

class StartMenu extends JPopupMenu {

// 显示Windows XP professional的文字图片

private Image image = null;

public StartMenu() {

// 创建文字图片

image = createImage();

}

public Image createImage() {

String text = "Windows XP Professional";

// 创建缓冲图片类变量

BufferedImage bi = new BufferedImage(30, 400,

BufferedImage.TYPE_INT_ARGB);

// 获取缓冲图片的2D绘图类变量

Graphics2D g2d = bi.createGraphics();

// 绘制渐变背景

GradientPaint paint = new GradientPaint(0, 0, Color.black, 100, 100,

Color.blue, true);

g2d.setPaint(paint);

g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());

// 逆时针旋转绘制角度90度

AffineTransform at = new AffineTransform();

at.rotate(-Math.PI / 2);

g2d.setTransform(at);

g2d.setColor(Color.white);

g2d.setFont(new Font("宋体", Font.BOLD, 16));

// 获取文字尺寸

FontMetrics metrics = g2d.getFontMetrics();

int width = metrics.stringWidth(text);

int height = metrics.getAscent();

// 居中绘制文字

g2d.drawString(text, -width - 50, bi.getWidth() / 2);

return bi;

}

public Insets getInsets() {

Insets insets = (Insets) super.getInsets().clone();

insets.left += image.getWidth(null);

return insets;

}

public void paint(Graphics g) {

super.paint(g);

if (image != null) {

Insets insets = getInsets();

g.drawImage(image, insets.left - image.getWidth(null), insets.top,

null);

}

}

}

// 图片菜单项类

class ImageMenu1 extends JMenuItem {

private Image image = null;

public ImageMenu1(String title, Image image) {

super(title);

this.image = image;

}

// 设置菜单项中显示文字图片的间隔大小

public Insets getInsets() {

Insets insets = (Insets) super.getInsets().clone();

insets.left += image.getWidth(null);

return insets;

}

// 重载绘图函数

public void paint(Graphics g) {

super.paint(g);

if (image != null) {

// 获取间隔

Insets insets = getInsets();

g.drawImage(image, 0, 0, null);

}

}

}