// Application for processing key code on canvas

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class PrintKeyCode extends MIDlet {

  private Display display;
  private KeyCodeCanvas canvas; // reference to a canvas

  // constructor
  public PrintKeyCode(){
    display = Display.getDisplay(this);
    canvas = new KeyCodeCanvas(this);
  }

  // startApp
  protected void startApp(){
    display.setCurrent(canvas);
  }

// pauseApp
  protected void pauseApp(){

  }

  // destroyApp
  protected void destroyApp(boolean unconditional){

  }
  public void exitMIDlet(){
    destroyApp(true);
    notifyDestroyed();
  }
}

/* Class PrintKeyCanvas - Key codes & commands for event handling */

class KeyCodeCanvas extends Canvas implements CommandListener{

  private Command cmExit;
  private String keyText = null;
  private PrintKeyCode midlet;

  // Constructor
  public KeyCodeCanvas(PrintKeyCode midlet){
    this.midlet = midlet;

    // create exit command & Listen for events
    cmExit = new Command("Exit", Command.EXIT, 1);
    addCommand(cmExit);
    setCommandListener(this);
  }

  // paint the text representing the keycode
  
  // The Graphics object is used to render directly onto the Canvas
  protected void paint(Graphics g){
      // Clear the background i.e. clear the display

      g.setColor(255,255,255); // white
      g.fillRect(0, 0, getWidth(), getHeight());
      System.out.println("Graphics area is:" +getWidth() + ","+getHeight());

      // set colour and draw text
      if(keyText != null){
        // draw with black pen
        g.setColor(0,0,0);
        // centre the text
        g.drawString(keyText, getWidth()/2, getHeight()/2, Graphics.TOP | Graphics.HCENTER);
      }
  }

  /* Command event handling */

      public void commandAction(Command c, Displayable d){
        if (c == cmExit)
          midlet.exitMIDlet();
      }
/* Key code event handling */
      protected void keyPressed(int KeyCode){
        keyText = getKeyName(KeyCode);
        repaint();
      }
}