windowdestop.java

这是一个用JAVA开发的Applet程序

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.net.*;
import javax.swing.border.*;

public class WindowDestop extends Applet {
  //菜单栏图标数组
  ImageIcon[] icons = new ImageIcon[9];
  //菜单栏图标的文件名
  String[] iconFileNames = {"windowIcon.gif", "leftIcon.gif",
           "shutDownIcon.gif", "runIcon.gif", "helpIcon.gif",
           "searchIcon.gif", "setIcon.gif", "documentIcon.gif",
           "programIcon.gif"};
  //桌面图标数组
  ImageIcon[] destopIcons = new ImageIcon[3];
  //桌面图标数组的文件名
  String[] destopIconsFileNames = {"1.gif", "2.gif", "3.gif"};
  JButton[] destopBtns = new JButton[3];//桌面按钮数组
  String[] destopBtnTitles = {"程序1", "程序2", "程序3"};//控钮的标题
  MenuPane menuPane;//菜单面板
  JPanel destopPane = new JPanel(); //Window面板
  JButton menuStart = new JButton();//开始按钮
  JPanel panelBottom = new JPanel();//放置开始按钮的面板
  //设置桌面底端面板的布局
  FlowLayout flowLayout1 = new FlowLayout();
  Dimension appletSize;//Applet的大小

  //Applet的初始化方法
  public void init() {
    try {jbInit();} catch(Exception e) {}
  }

  //被初始化方法引用的方法
  private void jbInit() throws Exception {
    //取得图标的方法
    for(int i = 0; i < 9; ++i){
      icons[i] = new ImageIcon(new URL(this.getCodeBase(),
                               iconFileNames[i]));
    }
    menuPane = new MenuPane(icons);//根据图标创建菜单面板
    //设置开始按钮的代码
    menuStart.setText("开始");
    menuStart.setIcon(icons[0]);
    menuStart.setPreferredSize(new Dimension(60, 23));
    menuStart.setBorder(BorderFactory.createEtchedBorder());
    menuStart.setAlignmentY((float) 0.0);

    //为开始按钮加入按键事件,决定菜单面板的显示位置
    menuStart.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        if(menuPane.getY() == appletSize.height-285){
          menuPane.setBounds(new Rectangle(3, appletSize.height-285+1800,
                             117, 250));
        }else{
          menuPane.setBounds(new Rectangle(3, appletSize.height-285,
                             117, 250));
        }
      }
    });

    this.setLayout(new BorderLayout()); //设置Applet的布局
    destopPane.setLayout(null);          //设置桌面面板的布局
    destopPane.setBackground(new Color(98, 112, 200));
    //为桌面面扳加入鼠标移动事件,当鼠标坐标x>205,y< appletSize.height-285时
    //使菜单不可见
    destopPane.addMouseMotionListener(new java.awt.event.
                                      MouseMotionAdapter() {
      public void mouseMoved(MouseEvent e) {
        if(e.getX() > 120 || e.getY() < appletSize.height - 285) {
          menuPane.setBounds(new Rectangle(3, appletSize.height-285+1800,
                             117, 250));
        }
      }
    });
    destopPane.add(menuPane, null);//向桌面面板加入菜单面板
    //设置桌面的控件
    for(int i = 0; i < 3; ++i){
      destopIcons[i] = new ImageIcon(new URL(this.getCodeBase(),
                                     destopIconsFileNames[i]));
      destopBtns[i] = new JButton(destopBtnTitles[i], destopIcons[i]);
      destopBtns[i].setVerticalTextPosition(SwingConstants.BOTTOM);
      destopBtns[i].setHorizontalTextPosition(SwingConstants.CENTER);
      destopBtns[i].setBounds(new Rectangle(i*75+3, 3, 68, 68));
      destopPane.add(destopBtns[i],null);
    }
    panelBottom.setLayout(flowLayout1);  //设置桌面底端面板的布局
    //使桌面底端面板的布局向左对齐
    flowLayout1.setAlignment(FlowLayout.LEFT);
    //设置桌面底端面板的边框
    panelBottom.setBorder(BorderFactory.createRaisedBevelBorder());

    //设置菜单面板的位置,当Applet启动时,使菜单不可见
    appletSize = this.getSize();
    menuPane.setBounds(new Rectangle(3, appletSize.height-285+1800,
                       117, 250));
    panelBottom.add(menuStart, null); //向桌面底端面板加入开始按钮
    this.add(destopPane, BorderLayout.CENTER);//向Applet加入桌面面板
    this.add(panelBottom, BorderLayout.SOUTH);//向Applet加入桌面底端面板
  }

  //创建菜单类
  class MenuPane extends JPanel{
    //按钮的标题
    String[] btnTitle = {"关机", "运行", "帮助", "搜索",
                       "设置", "文档", "程序"};
    //声明菜单的按钮
    MenuBtn[] menuBtns = new MenuBtn[7];

    JLabel labelLeft = new JLabel();  //菜单左边的标签
    JPanel paneRight = new JPanel();  //菜单右边的面板

    public MenuPane(ImageIcon[] icons){
      super();//执行面板的父构造方法
      //设置菜单栏的边框与布局
      this.setBorder(BorderFactory.createEtchedBorder());
      this.setLayout(new BorderLayout());
      //创建菜单的七个按钮
      for(int i = 0; i < 7; ++i){
        menuBtns[i] = new MenuBtn(btnTitle[i],icons[i+2]);
      }
      //向菜单的右边面板加入按钮
      for(int i = 6; i >= 0; --i){
        paneRight.add(menuBtns[i],null);
      }
      labelLeft.setIcon(icons[1]);//设置菜单左边的图标
      //向菜单加入左边标签
      this.add(labelLeft, BorderLayout.WEST);
      //向菜单加右边标签
      this.add(paneRight, BorderLayout.CENTER);
    }
  }

  //创建菜单按钮类
  class MenuBtn extends JButton implements MouseListener, ActionListener{
    Border lineBorder;

    public MenuBtn(String title , Icon icon){
      //执行父类的方法
      super(title, icon);
      lineBorder = BorderFactory.createLineBorder(Color.lightGray,2);
      this.setBorder(lineBorder);//设置按钮的边框
      this.setPreferredSize(new Dimension(80, 28));//设置按钮的大小
      this.addMouseListener(this);//加入鼠标移动接收器
      this.addActionListener(this);//加入按钮接收器
    }
    //按钮的按键事件
    public void actionPerformed(ActionEvent e) {
      JOptionPane.showMessageDialog(null,"您好，我是" + this.getText() +
                                    "按钮");
    }

    //当鼠标进入载有鼠标接收器的容器内时,该事件被激活
    public void mouseEntered(MouseEvent e) {
      this.setBackground(new Color(98, 112, 200));
    }
    //当鼠标离开载有鼠标接收器的容器内时,该事件被激活
    public void mouseExited(MouseEvent e) {
      this.setBackground(new Color(212, 208, 200));
    }
    //当鼠标按下时,该事件被激发
    public void mousePressed(MouseEvent e) {}
    //当鼠标按下时,该事件被激发,但该事件在mousePressed事件之后
    public void mouseReleased(MouseEvent e) {}
    //当鼠标按下时,该事件被激活,但该事件在mouseReleased事件之后
    public void mouseClicked(MouseEvent e) {}
  }
}