seatingplanui.java

来自「SUN公司发布的SmartTicket 2.0蓝图」· Java 代码 · 共 422 行

/*
 * Copyright 2001, 2002, 2003 Sun Microsystems, Inc. All Rights Reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistribution in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Sun Microsystems, Inc., the 'Java Smart Ticket
 * Sample Application', 'Java', 'Java'-based names, or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Java Smart Ticket Sample Application 1.2 graphics and images may not
 * be reproduced in any form, in whole or in part, by any means without
 * prior written authorization of Sun and its licensors, if any.
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES OR LIABILITIES
 * SUFFERED BY LICENSEE AS A RESULT OF OR RELATING TO USE, MODIFICATION
 * OR DISTRIBUTION OF THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL
 * SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA,
 * OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
 * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * You acknowledge that Software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 * $Id: SeatingPlanUI.java,v 1.4 2003/06/02 08:01:32 ro89390 Exp $
 */
package com.sun.j2me.blueprints.smartticket.client.midp.ui;

import javax.microedition.lcdui.*;
import java.util.*;
import com.sun.j2me.blueprints.smartticket.client.midp.util.ApplicationUtilities;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.Movie;
import com.sun.j2me.blueprints.smartticket.shared.midp.model.SeatingPlan;
import com.sun.j2me.blueprints.smartticket.client.midp.ui.UIController.EventIds;

public class SeatingPlanUI extends Canvas implements CommandListener {
    // Often-used colors.
    private static final int WHITE = 0xffffff;
    private static final int RED = 0xff6d00;
    private static final int GREEN = 0x006d55;
    private static final int BLUE = 0x0000ff;
    private static final int BURGUNDY = 0xb60055;
    private Command reserveCommand;
    private Command buyCommand;
    private Command cancelCommand;
    private int currentRowNumber;
    private int currentSeatNumber;
    // Off-screen buffer.
    private Image buffer;
    // Canvas and individual seat dimensions.
    private int canvasW, canvasH, seatH, seatW;
    // Margins for the seating plan.
    private int marginT, marginB, marginL, marginR;
    // Is the cursor on?
    private Timer timer;
    private boolean cursorOn;
    private UIController uiController;
    private SeatingPlan seatingPlan;

    /**
     * @link dependency
     */
    /* # TicketPurchaseUI lnkTicketPurchaseUI; */
    public SeatingPlanUI(UIController uiController) {
        this.uiController = uiController;
        cancelCommand = 
            new Command(uiController.getString(UIMessageCodes.CANCEL), 
                        Command.CANCEL, 1);

        addCommand(cancelCommand);

        reserveCommand = 
            new Command(uiController.getString(UIMessageCodes.RESERVE), 
                        Command.SCREEN, 1);

        setCommandListener(this);
    }

    /**
     * Initialize the seating canvas variables.
     * @exception IOException  when some type of network error occurs.
     */
    public void init(SeatingPlan seatingPlan, Movie movie, int[] showTime) {
        this.seatingPlan = seatingPlan;

        removeCommand(reserveCommand);

        canvasW = getWidth();
        canvasH = getHeight();
        buffer = Image.createImage(canvasW, canvasH);

        Graphics g = buffer.getGraphics();
        Font f = g.getFont();

        // Paint the canvas background.
        g.setColor(WHITE);
        g.fillRect(0, 0, canvasW, canvasH);
        // Draw static textual information on canvas.
        g.setColor(BURGUNDY);
        g.drawString(uiController.getString(UIMessageCodes.SCREEN), canvasW, 
                     0, Graphics.TOP | Graphics.RIGHT);

        // FIXME
        String titleText = movie.getTitle();
        String showTimeText = ApplicationUtilities.showTimeToString(showTime);
        int titleWidth = f.stringWidth(titleText);
        int showTimeWidth = f.stringWidth(showTimeText);

        if (titleWidth + showTimeWidth < canvasW) {
            g.drawString(titleText, 0, canvasH, 
                         Graphics.BASELINE | Graphics.LEFT);
        } else {
            int targetWidth = canvasW - showTimeWidth;
            int l = titleText.length() - 1;

            while (l > 0) {
                if (f.substringWidth(titleText, 0, l) < targetWidth) {
                    break;
                } else {
                    l--;
                } 
            } 

            g.drawString(titleText.substring(0, l), 0, canvasH, 
                         Graphics.BASELINE | Graphics.LEFT);
        } 

        g.setColor(BLUE);
        g.drawString(showTimeText, canvasW, canvasH, 
                     Graphics.BASELINE | Graphics.RIGHT);

        // Adjust left and top margins to center seating plan.
        marginT = f.getHeight() + (canvasH % seatingPlan.getRowCount()) / 2;
        marginB = f.getHeight();
        marginL = (canvasW % seatingPlan.getRowLength()) / 2;
        marginR = 0;
        // Calculate seat width and height.
        seatW = (canvasW - (marginL + marginR)) / seatingPlan.getRowLength();
        seatH = (canvasH - (marginT + marginB)) / seatingPlan.getRowCount();

        // Position the cursor on the first empty seat.
        for (int r = 0; r != seatingPlan.getRowCount(); r++) {
            for (int s = 0; s != seatingPlan.getRowLength(); s++) {
                if (seatingPlan.getStatusOf(r, s) == SeatingPlan.AVAILABLE) {
                    currentRowNumber = r;
                    currentSeatNumber = s;
                } 
            } 
        } 

        // Draw the seating plan.
        for (int r = 0; r != seatingPlan.getRowCount(); r++) {
            for (int s = 0; s != seatingPlan.getRowLength(); s++) {
                drawSeat(r, s);
            } 
        } 

        drawSeatID();
    } 

    public void commandAction(Command command, Displayable displayable) {
        if (command == reserveCommand) {
            uiController.handleEvent(EventIds.EVENT_ID_SEATS_SELECTED, 
                                     new Object[] {
                seatingPlan.getBookedSeats()
            });
        } else if (command == cancelCommand) {
            uiController.handleEvent(EventIds.EVENT_ID_SEAT_SELECTION_CANCELLED);
        } else {
            uiController.commandAction(command, displayable);
        } 
    } 

    /**
     * Draw individual seat with current status.
     */
    void drawSeat(int rowNumber, int seatNumber) {
        drawSeat(rowNumber, seatNumber, -1);
    } 

    /**
     * Draw individual seat with over-riding color.
     * @param  color the color to draw seat.
     */
    synchronized void drawSeat(int rowNumber, int seatNumber, int color) {
        int x = marginL + seatNumber * seatW;
        int y = marginT + rowNumber * seatH;

        // If no color was specified, pick an appropriate color.
        if (color == -1) {
            switch (seatingPlan.getStatusOf(rowNumber, seatNumber)) {

            case SeatingPlan.AVAILABLE:
                color = WHITE;

                break;

            case SeatingPlan.BOOKED:
                color = BLUE;

                break;

            case SeatingPlan.UNAVAILABLE:
                color = RED;

                break;

            default:
                return;
            }
        } 

        // Paint the seat and draw its border.
        if (seatingPlan.getStatusOf(rowNumber, seatNumber) 
                != SeatingPlan.AISLE) {
            Graphics g = buffer.getGraphics();

            g.setColor(color);
            g.fillRect(x, y, seatW, seatH);
            g.setColor(GREEN);
            g.drawRect(x, y, seatW, seatH);
            repaint(x, y, seatW, seatH);
        } 
    } 

    /**
     * Draw the position on the screen.
     */
    synchronized void drawSeatID() {
        Graphics g = buffer.getGraphics();
        Font f = g.getFont();
        String pos = "R" + currentRowNumber + " S" + currentSeatNumber;

        g.setColor(WHITE);
        g.fillRect(0, 0, f.stringWidth(pos + "  "), f.getHeight());
        g.setColor(BLUE);
        g.drawString(pos, 0, 0, Graphics.TOP | Graphics.LEFT);
        repaint(0, 0, f.stringWidth(pos + "  "), f.getHeight());
    } 

    /**
     * Draw the cursor object.
     */
    void drawCursor() {
        if (cursorOn) {
            drawSeat(currentRowNumber, currentSeatNumber, BURGUNDY);
        } else {
            drawSeat(currentRowNumber, currentSeatNumber);
        } 
    } 

    /**
     * Book or unbook the given seat.
     */
    void toggleSeat(int rowNumber, int seatNumber) {
        if (seatingPlan.getStatusOf(rowNumber, seatNumber) 
                == SeatingPlan.BOOKED) {
            seatingPlan.setStatusOf(rowNumber, seatNumber, 
                                    SeatingPlan.AVAILABLE);
        } else if (seatingPlan.getStatusOf(rowNumber, seatNumber) 
                   == SeatingPlan.AVAILABLE) {
            seatingPlan.setStatusOf(rowNumber, seatNumber, 
                                    SeatingPlan.BOOKED);
        } else {
            return;
        } 

        if (seatingPlan.getBookedSeatsCount() > 0) {
            addCommand(reserveCommand);
        } else {
            removeCommand(reserveCommand);
        } 
    } 

    // Overridden methods
    protected void paint(Graphics g) {
        g.drawImage(buffer, 0, 0, Graphics.TOP | Graphics.LEFT);
    } 

    protected void keyPressed(int keyCode) {
        int oldRowNumber = currentRowNumber;
        int oldSeatNumber = currentSeatNumber;
        int action = getGameAction(keyCode);

        switch (action) {

        case Canvas.FIRE:
            toggleSeat(currentRowNumber, currentSeatNumber);

            break;

        case Canvas.LEFT:
            for (int s = (currentSeatNumber - 1); s >= 0; s--) {
                int status = seatingPlan.getStatusOf(currentRowNumber, s);

                if (status == SeatingPlan.BOOKED 
                        || status == SeatingPlan.AVAILABLE) {
                    currentSeatNumber = s;

                    break;
                } 
            } 

            break;

        case Canvas.RIGHT:
            for (int s = (currentSeatNumber + 1); 
                    s < seatingPlan.getRowLength(); s++) {
                int status = seatingPlan.getStatusOf(currentRowNumber, s);

                if (status == SeatingPlan.BOOKED 
                        || status == SeatingPlan.AVAILABLE) {
                    currentSeatNumber = s;

                    break;
                } 
            } 

            break;

        case Canvas.UP:
            for (int r = (currentRowNumber - 1); r >= 0; r--) {
                int status = seatingPlan.getStatusOf(r, currentSeatNumber);

                if (status == SeatingPlan.BOOKED 
                        || status == SeatingPlan.AVAILABLE) {
                    currentRowNumber = r;

                    break;
                } 
            } 

            break;

        case Canvas.DOWN:
            for (int r = (currentRowNumber + 1); 
                    r < seatingPlan.getRowCount(); r++) {
                int status = seatingPlan.getStatusOf(r, currentSeatNumber);

                if (status == SeatingPlan.BOOKED 
                        || status == SeatingPlan.AVAILABLE) {
                    currentRowNumber = r;

                    break;
                } 
            } 

            break;

        default:
            return;
        }

        // Draw new seat and re-draw old seat.
        drawCursor();
        drawSeat(oldRowNumber, oldSeatNumber);
        drawSeatID();
    } 

    protected void pointerPressed(int x, int y) {
        // Get the clicked position based on x and y coordinates.
        int rowNumber = (y - marginT) / seatH;
        int seatNumber = (x - marginL) / seatW;

        if (rowNumber < 0 || rowNumber >= seatingPlan.getRowCount() 
                || seatNumber < 0 
                || seatNumber >= seatingPlan.getRowLength()) {
            return;
        } 

        int oldRowNumber = currentRowNumber;
        int oldSeatNumber = currentSeatNumber;
        int currentStatus = seatingPlan.getStatusOf(currentRowNumber, 
                                                    currentSeatNumber);

        if (currentStatus == SeatingPlan.AVAILABLE 
                || currentStatus == SeatingPlan.BOOKED) {
            currentRowNumber = rowNumber;
            currentSeatNumber = seatNumber;

            toggleSeat(currentRowNumber, currentSeatNumber);
            // Draw new seat and re-draw old seat.
            drawCursor();
            drawSeat(oldRowNumber, oldSeatNumber);
            drawSeatID();
        } 
    } 

    protected void showNotify() {
        // Start the timer for the cursor.
        timer = new Timer();

        TimerTask task = new TimerTask() {
            public void run() {
                cursorOn = !cursorOn;

                drawCursor();
            } 

        };

        timer.schedule(task, 750, 750);
    } 

    protected void hideNotify() {
        // Stop the timer for the cursor.
        timer.cancel();
    } 

}