mainmenu.java

孤单惊魂

import javax.microedition.lcdui.*;

public class MainMenu
    extends Canvas implements CommandListener {
  private int SCREEN_WIDTH = getWidth();
  private int SCREEN_HEIGHT = getHeight();
  private int N = 7, menuindex = 0;
  private String menustr[] = new String[N];
  private Image button1, button2;
  private static Displayable instance;
  synchronized public static Displayable getInstance() {
    if (instance == null) {
      instance = new MainMenu();
    }
    return instance;
  }

  private MainMenu() {
    menustr[0] = "新游戏";
    menustr[1] = "载入游戏";
    menustr[2] = "玩家积分";
    menustr[3] = "设置";
    menustr[4] = "帮助";
    menustr[5] = "关于";
    menustr[6] = "退出";
    try {
      button1 = Image.createImage("/button1.png");
      button2 = Image.createImage("/button2.png");
    }
    catch (Exception ex) {}
    addCommand(new Command("确定", Command.OK, 1));
    setCommandListener(this);
  }

  protected void keyPressed(int key) {
    if (menuindex < N) {
      switch (getGameAction(key)) {
        case Canvas.UP:
          menuindex--;
          if (menuindex < 0) {
            menuindex = N - 1;
          }
          break;
        case Canvas.DOWN:
          menuindex++;
          if (menuindex > (N - 1)) {
            menuindex = 0;
          }
          break;
      }
      repaint();
    }
  }

  protected void paint(Graphics g) {
    g.setColor(74, 50, 0);
    g.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    g.setColor(200, 10, 0);
    g.setFont(Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD,
                           Font.SIZE_LARGE));
    g.drawString("孤 胆 惊 魂", SCREEN_WIDTH / 2,1,
                 Graphics.HCENTER | Graphics.TOP);
    g.setFont(Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD,
                           Font.SIZE_MEDIUM));
    for (int i = 0; i < N; i++) {
      if (i == menuindex) {
        g.drawImage(button2, this.getWidth() / 2,
                    this.getHeight() / 9 * (1 + i),
                    Graphics.HCENTER | Graphics.TOP);
        g.setColor(255, 0, 0);
      }
      else {
        g.drawImage(button1, this.getWidth() / 2,
                    this.getHeight() / 9 * (1 + i),
                    Graphics.HCENTER | Graphics.TOP);
        g.setColor(255, 255, 255);
      }
      g.drawString(menustr[i], this.getWidth() / 2,
                   this.getHeight() / 9 * (1 + i),
                   Graphics.HCENTER | Graphics.TOP);
    }
  }

  public void commandAction(Command c, Displayable s) {
    String cmd = String.valueOf(menuindex);
    Navigator.flow(cmd);
  }
}