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// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
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// purposes only.
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package bcexchanger.ui;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
import bcexchanger.*;

/**
 * 
 * This class represents a screen displaying an alert message. The
 * class is extending an example.BCExchanger.ui.Screen class
 * 
 * @version 1.0 20.09.2005
 * @see example.BCExchanger.ui.Screen Design patterns: State
 */
public class AlertMessage extends Screen {

  Alert alert;
  Screen nextScreen = null;
  boolean quitAfterDismiss = false;

  /**
   * Constructor
   * 
   * @param _midlet -
   *          the parent class which keeps the current UI state
   * @param message -
   *          text to display
   * @param _nextScreen -
   *          UI screen should be displayed after the alarm message is
   *          dismissed
   */
  public AlertMessage(BCExchangerMIDlet _midlet, String message,
      Screen _nextScreen) {
    super(_midlet);

    nextScreen = _nextScreen;
    init(message);
  }

  /**
   * Constructor
   * 
   * If this constructor is used, the application will exit after the
   * alert is dismissed
   * 
   * @param _midlet -
   *          the parent class which keeps the current UI state
   * @param message -
   *          text to display
   */
  public AlertMessage(BCExchangerMIDlet _midlet, String message) {
    super(_midlet);

    //quitAfterDismiss = true;
    init(message);
  }

  /**
   * Initialise the displayable
   * 
   * @param message -
   *          text to display
   */
  private void init(String message) {

    alert = new Alert("", message, null, null);
    alert.setCommandListener(this);

    displayable = alert;
  }

  public void commandAction(Command command, Displayable _displayable) {
    if (_displayable != alert) {
      // wrong displayable
      throw new RuntimeException("Internal error #28");
    }

    if (command == Alert.DISMISS_COMMAND) {
      if (quitAfterDismiss) {
        midlet.quit();
      } else {
        if (nextScreen != null) {
          midlet.changeScreen(nextScreen);
        }
      }
    } else {
      // unknown command
      throw new RuntimeException("Internal error #29");
    }
  }

}