import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class MainFrame
    extends JFrame
    implements ActionListener {
  JPanel panel1;
  Container c;
  JMenuBar menuB;
  JMenu systemMenu, bookMGRMenu, borrowBookMenu, returnBookMenu,
      infoBrowseMenu, userMGRMenu,aboutMenu;
  JMenuItem userLoginMenuItem, userAddMenuItem, userModifyMenuItem,
      userDeleteMenuItem, exitMenuItem, bookAddMenuItem, bookModifyMenuItem,
      bookDeleteMenuItem,
      borrowBookMenuItem, borrowInfoMenuItem, returnBookMenuItem,
      returnInfoMenuItem,
      bookListMenuItem, borrowBookListMenuItem, userListMenuItem,bookBrowseListMenuItem,
      aboutMenuItem;
  public MainFrame() {
    super("圖書館管理系統");
    //--系統管理菜單--
    menuB = new JMenuBar();
    systemMenu = new JMenu("系統管理");
    userMGRMenu = new JMenu("用戶管理");
    userLoginMenuItem = new JMenuItem("用戶登錄");
    userAddMenuItem = new JMenuItem("添加用戶");
    userModifyMenuItem = new JMenuItem("修改密碼");
    userDeleteMenuItem = new JMenuItem("刪除用戶");
    exitMenuItem = new JMenuItem("退出");
    systemMenu.add(userLoginMenuItem);
    userMGRMenu.add(userAddMenuItem);
    userMGRMenu.add(userModifyMenuItem);
    userMGRMenu.add(userDeleteMenuItem);
    systemMenu.add(userMGRMenu);
    systemMenu.add(exitMenuItem);
    userLoginMenuItem.addActionListener(this);
    userAddMenuItem.addActionListener(this);
    userModifyMenuItem.addActionListener(this);
    userDeleteMenuItem.addActionListener(this);
    exitMenuItem.addActionListener(this);
    menuB.add(systemMenu);
    //---書籍管理菜單--
    bookMGRMenu = new JMenu("書籍管理");
    bookAddMenuItem = new JMenuItem("添加書籍");
    bookModifyMenuItem = new JMenuItem("修改書籍");
    bookDeleteMenuItem = new JMenuItem("刪除書籍");
    bookMGRMenu.add(bookAddMenuItem);
    bookMGRMenu.add(bookModifyMenuItem);
    bookMGRMenu.add(bookDeleteMenuItem);
    bookAddMenuItem.addActionListener(this);
    bookModifyMenuItem.addActionListener(this);
    bookDeleteMenuItem.addActionListener(this);
    menuB.add(bookMGRMenu);
    //--借書管理菜單--
    borrowBookMenu = new JMenu("借書管理");
    borrowBookMenuItem = new JMenuItem("書籍出借");
    borrowInfoMenuItem = new JMenuItem("出借信息修改");
    borrowBookMenu.add(borrowBookMenuItem);
    borrowBookMenu.add(borrowInfoMenuItem);
    borrowBookMenuItem.addActionListener(this);
    borrowInfoMenuItem.addActionListener(this);
    menuB.add(borrowBookMenu);
    //--還書管理菜單--
    returnBookMenu = new JMenu("還書管理");
    returnBookMenuItem = new JMenuItem("書籍還入");
    returnInfoMenuItem = new JMenuItem("書籍還入信息修改");
    returnBookMenu.add(returnBookMenuItem);
    returnBookMenu.add(returnInfoMenuItem);
    returnBookMenuItem.addActionListener(this);
    returnInfoMenuItem.addActionListener(this);
    menuB.add(returnBookMenu);
    //--信息一覽菜單--
    infoBrowseMenu = new JMenu("信息查詢");
    bookListMenuItem = new JMenuItem("書籍信息查詢");
    borrowBookListMenuItem = new JMenuItem("借閱信息查詢");
    userListMenuItem = new JMenuItem("用戶列表");
  //bookBrowseListMenuItem = new JMenuItem("借閱情況覽表")；
    infoBrowseMenu.add(bookListMenuItem);
    infoBrowseMenu.add(borrowBookListMenuItem);
    infoBrowseMenu.add(userListMenuItem);
  //  infoBrowseMenu.add(bookBrowseListMenuItem);
    bookListMenuItem.addActionListener(this);
    borrowBookListMenuItem.addActionListener(this);
    userListMenuItem.addActionListener(this);
  //  bookBrowseListMenuItem.addActionListener(this);
    menuB.add(infoBrowseMenu);
    //--關于菜單--
    aboutMenu=new JMenu("幫助");
    aboutMenuItem = new JMenuItem("關于");
    aboutMenuItem.addActionListener(this);
    aboutMenu.add(aboutMenuItem);
    menuB.add(aboutMenu);
    //----------------------------------
    setJMenuBar(menuB);

    c = getContentPane();
    c.setLayout(new BorderLayout());
    panel1 = new JPanel();
    panel1.setLayout(new BorderLayout());

    c.add(panel1, BorderLayout.CENTER);

    //--設置初始功能:--
    userMGRMenu.setEnabled(false);
    bookMGRMenu.setEnabled(false);
    borrowBookMenu.setEnabled(false);
    returnBookMenu.setEnabled(false);
    infoBrowseMenu.setEnabled(false);
    aboutMenu.setEnabled(false);
  }

  //--設置每個菜單點擊后出現的窗口和窗口顯示的位置--
  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand() == "用戶登錄") {
      UserLogin UserLoginFrame = new UserLogin(this);//創建用例類實例對象
      Dimension FrameSize = UserLoginFrame.getPreferredSize();//子窗口大小
      Dimension MainFrameSize = getSize();//主窗口大小
      Point loc = getLocation();//主窗口位置
      UserLoginFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                 loc.x,
                                 (MainFrameSize.height - FrameSize.height) / 2 +
                                 loc.y);//設置子窗口的位置位于主窗口的中央
      UserLoginFrame.pack();
      UserLoginFrame.show();
    }
    else if (e.getActionCommand() == "添加用戶") {
      UserAdd UserAddFrame = new UserAdd();
      Dimension FrameSize = UserAddFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserAddFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                               loc.x,
                               (MainFrameSize.height - FrameSize.height) / 2 +
                               loc.y);
      UserAddFrame.pack();
      UserAddFrame.show();
    }
    else if (e.getActionCommand() == "修改密碼") {
      UserModify UserModifyFrame = new UserModify();
      Dimension FrameSize = UserModifyFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserModifyFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      UserModifyFrame.pack();
      UserModifyFrame.show();
    }
    else if (e.getActionCommand() == "刪除用戶") {
      UserDelete UserDeleteFrame = new UserDelete();
      Dimension FrameSize = UserDeleteFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserDeleteFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      UserDeleteFrame.pack();
      UserDeleteFrame.show();
    }
    else if (e.getActionCommand() == "添加書籍") {
      BookAdd BookAddFrame = new BookAdd();
      Dimension FrameSize = BookAddFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookAddFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                               loc.x,
                               (MainFrameSize.height - FrameSize.height) / 2 +
                               loc.y);
      BookAddFrame.pack();
      BookAddFrame.show();
    }
    else if (e.getActionCommand() == "修改書籍") {
      BookModify BookModifyFrame = new BookModify();
      Dimension FrameSize = BookModifyFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookModifyFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      BookModifyFrame.pack();
      BookModifyFrame.show();