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package bcexchanger.ui;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Gauge;
import javax.microedition.lcdui.Item;
import bcexchanger.*;

/**
 * 
 * This class implements the screen which indicates that some
 * operation is in progress. For example when inquiry, service
 * discovery, business card sending and receiving is running this
 * screen is displayed. Using this screen user can cancel the processs
 * 
 * The class is extending an example.BCExchanger.ui.Screen class
 * 
 * @version 1.0 29.09.2005
 * @see example.BCExchanger.ui.Screen Design patterns: State
 */
public class ProgressScreen extends Screen {

  private Command cancelCommand;

  private Gauge gauge;
  private Form progressBar;
  
  /**
   * Constructor
   * 
   * @param _midlet -
   *          the parent class which keeps the current UI state
   * @param message -
   *          text message to be displayed
   */
  public ProgressScreen(BCExchangerMIDlet _midlet, String message) {
    super(_midlet);

    progressBar = new Form("Please wait");

    gauge = new Gauge(message, false, Gauge.INDEFINITE, Gauge.CONTINUOUS_RUNNING);
    gauge.setLayout(Item.LAYOUT_CENTER);
    gauge.setLayout(Item.LAYOUT_VCENTER);
    progressBar.append(gauge);
    
    cancelCommand = new Command("Cancel", Command.CANCEL, 1);
    progressBar.addCommand(cancelCommand);

    progressBar.setCommandListener(this);
   
    displayable = progressBar;
    
  }

  public void commandAction(Command command, Displayable _displayable) {

    if (_displayable != progressBar) {
      // wrong displayable
      throw new RuntimeException("Internal error #21");
    }

    if (command == cancelCommand) {
      midlet.getExchanger().cancelSending();
    } else {
      // unknown command
      throw new RuntimeException("Internal error #22");
    }
  }

}