Java餐馆订单服务系统源代码

package booksys.presentation ; import booksys.application.domain.* ; import java.awt.* ; import java.awt.event.* ; import java.sql.Date ; import java.sql.Time ; import java.util.* ; public class StaffUI extends Canvas implements BookingObserver { final static int LEFT_MARGIN = 50 ; final static int TOP_MARGIN = 50 ; final static int BOTTOM_MARGIN = 50 ; final static int ROW_HEIGHT = 30 ; final static int COL_WIDTH = 60 ; final static int PPM = 2 ; // Pixels per minute final static int PPH = 60 * PPM ; // Pixels per hours final static int TZERO = 18 ; // Earliest time shown final static int SLOTS = 12 ; // Number of booking slots shown // Routines to convert between (x, y) and (time, table)，为的是确定一个“预定”项的显示位置 private int timeToX(Time time) { return LEFT_MARGIN + PPH * (time.getHours() - TZERO) + PPM * time.getMinutes() ; } private Time xToTime(int x) { x -= LEFT_MARGIN ; int h = (x / PPH) + TZERO ; int m = (x % PPH) / PPM ; return new Time(h, m, 0) ; } private int tableToY(int table) { return TOP_MARGIN + (ROW_HEIGHT * (table - 1)) ; } private int yToTable(int y) { return ((y - TOP_MARGIN) / ROW_HEIGHT) + 1 ; } // Data members private Frame parentFrame ; //用户界面的容器 private BookingSystem bs ; //包含对一个BookingSystem对象的引用 private Image offscreen ; private Vector tableNumbers ; //包含该餐馆的所有桌面 private int firstX, firstY, currentX, currentY ; private boolean mouseDown ; public StaffUI(Frame f) { parentFrame = f ; //update() ;2006.7.25 tableNumbers = BookingSystem.getTableNumbers() ; setSize(LEFT_MARGIN + (SLOTS * COL_WIDTH), TOP_MARGIN + tableNumbers.size()*ROW_HEIGHT + BOTTOM_MARGIN) ;//设置界面的大小 setBackground(Color.white) ; bs = BookingSystem.getInstance() ; //创建一个BookingSystem对象 bs.addObserver(this) ; //告诉这一BookingSystem对象“谁”在关注它 Calendar now = Calendar.getInstance() ; bs.display(new Date(now.getTimeInMillis())) ; //显示在当天被预定的桌子 //用鼠标选择一个预定项 addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { currentX = firstX = e.getX() ; currentY = firstY = e.getY() ; if (e.getButton() == MouseEvent.BUTTON1) { mouseDown = true ; bs.selectBooking(yToTable(firstY), xToTime(firstX)) ; } } }); addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) { mouseDown = false ; bs.transfer(xToTime(currentX), yToTable(currentY)) ; //确定被选定项的预定时间和桌面 } }); //侦听鼠标被拖动时，鼠标的坐标，并更新它！ addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { currentX = e.getX() ; currentY = e.getY() ; update() ; } }) ; } public void update() { repaint() ; } public void paint(Graphics g) { update(g) ; } public void update(Graphics g) { Dimension canvasSize = getSize() ; if (offscreen == null) { offscreen = this.createImage(canvasSize.width, canvasSize.height) ; } Graphics og = offscreen.getGraphics() ; og.setColor(getBackground()) ; og.fillRect(0, 0, canvasSize.width, canvasSize.height) ; og.setColor(Color.black) ; // Draw screen outlines og.drawLine(LEFT_MARGIN, 0, LEFT_MARGIN, canvasSize.height) ; og.drawLine(0, TOP_MARGIN, canvasSize.width, TOP_MARGIN) ; // Write table numbers and horizontal rules for (int i = 0; i < tableNumbers.size(); i++) { int y = TOP_MARGIN + (i+1)*ROW_HEIGHT ; og.drawString(Integer.toString(i+1), 0, y) ; og.drawLine(LEFT_MARGIN, y, canvasSize.width, y) ; } // Write time labels and vertical rules for (int i = 0; i < SLOTS; i++) { String tmp = (TZERO+(i/2)) + (i%2 == 0? ":00" : ":30") ; int x = LEFT_MARGIN + i*COL_WIDTH ; og.drawString(tmp, x, 40) ; og.drawLine(x, TOP_MARGIN, x, canvasSize.height-BOTTOM_MARGIN) ; } // Display booking information /* og.drawString(((java.util.Date) bs.getCurrentDate()).toString(), LEFT_MARGIN, 20) ; Enumeration enum = bs.getBookings() ; while (enum.hasMoreElements()) { Booking b = (Booking) enum.nextElement() ; int x = timeToX(b.getTime()) ; int y = tableToY(b.getTable().getNumber()) ; og.setColor(Color.gray) ; og.fillRect(x, y, 4*COL_WIDTH, ROW_HEIGHT) ; if (b == bs.getSelectedBooking()) { og.setColor(Color.red) ; og.drawRect(x, y, 4*COL_WIDTH, ROW_HEIGHT) ; } og.setColor(Color.white) ; og.drawString(b.getDetails(), x, y + ROW_HEIGHT/2) ; } // Draw an outline to represent position of dragged booking Booking b = bs.getSelectedBooking() ; if (mouseDown && b != null) { int x = timeToX(b.getTime()) + currentX - firstX ; int y = tableToY(b.getTable().getNumber()) + currentY - firstY ; og.setColor(Color.red) ; og.drawRect(x, y, 4*COL_WIDTH, ROW_HEIGHT) ; } // Write to canvas */ g.drawImage(offscreen, 0, 0, this) ; } public boolean message(String message, boolean confirm) { ConfirmDialog d = new ConfirmDialog(parentFrame, message, confirm) ; d.show() ; return d.isConfirmed() ; } void displayDate() { DateDialog d = new DateDialog(parentFrame, "Enter a date") ; d.show() ; if (d.isConfirmed()) { Date date = d.getDate() ; bs.display(date) ; } } void addReservation() { ReservationDialog d = new ReservationDialog(parentFrame, "Enter reservation details") ; d.show() ; if (d.isConfirmed()) { bs.makeReservation(d.getCovers(), bs.getCurrentDate(), d.getTime(), d.getTableNumber(), d.getCustomerName(), d.getPhoneNumber()) ; } } void addWalkIn() { WalkInDialog d = new WalkInDialog(parentFrame, "Enter walk-in details") ; d.show() ; if (d.isConfirmed()) { bs.makeWalkIn(d.getCovers(), bs.getCurrentDate(), d.getTime(), d.getTableNumber()) ; } } void cancel() { bs.cancel() ; } void recordArrival() { Calendar now = Calendar.getInstance() ; bs.recordArrival(new Time(now.getTimeInMillis())) ; } }