/**
* ScrollText.java - Scrolling text widget (simple version)
*
* This class presents a text message that scrolls through rectangular 
* area from right to left.
*
* @author	Philip Meese
* @version	1.0, 3/16/96 Java Tutor, Second Column
* @copyright	Copyright 1996 Philip Meese, All Rights Reserved
*/
import java.awt.*;

public class ScrollText extends Canvas implements Runnable{
	private Thread		_thread;
	private String		_message;
	private int		_speed=50;	// medium speed default
	private Font		_font;
	private FontMetrics	_fontMetrics;
	private int		_msgWidth;
	private Rectangle	_rect;
	private int		_msgX, _msgY;
	private boolean		stat;

	/**
	* Constructor which sets message, width and height of display area
	*
	* @arg message_	The message to be displayed
	* @arg width_		The initial width of the display area
	* @arg height_		The initial height of the display area
	*/
	public ScrollText(String message_, int width_, int height){
	     _message=message_;
	     _font=new Font("TimesRoman", Font.BOLD, 56);
	     _rect=new Rectangle(0, 0, width_, height);
		 
	    reshape(0, 0, width_, height);
	     _msgX=width_;			// offscreen, right
	     
	     _thread=new Thread(this);
	}
	/**
	* Sets the scrolling speed
	*
	* @arg speed_ 	A value between 1 and 100 (slowest to fastest)
	*/
	public void speed(int speed_){
	     if(speed_ > 0 && speed_ < 100)
		  _speed=speed_;
	}

	public void status (boolean t){
		stat = t;
		if (stat)
			repaint();
		System.out.println(stat);
	}
	/**
	* Your standard paint function. Called by your standard update()
	*
	* @arg g_	The Graphics object to paint on
	*/
	public void paint(Graphics g_){
	     _rect=bounds();				// the space we live in
	     g_.setFont(_font);
	     _fontMetrics=g_.getFontMetrics(_font);
	     _msgY=_fontMetrics.getAscent();
	     _msgWidth=_fontMetrics.stringWidth(_message);

		 if (!stat)
			{
			 paintBackground(g_, Color.blue);
			paintMessage(g_, Color.yellow);
			System.out.println("stat false");
			}
		 else
			 {
			 paintBackground(g_, Color.white);
			 printMessage(g_, Color.blue);
			 System.out.println("stat true");
			}

	}
	/**
	* A painter's helper: Paints the message at it's current position
	*
	* @arg g_	The Graphics object to paint on
	* @arg c_	The color to use for painting
	*/
	private void paintMessage(Graphics g_, Color c_){
	     g_.setColor(c_);
	     g_.drawString(_message, _msgX, _msgY);
	}

	private void printMessage(Graphics g_, Color c_){
		Font _fonta;

		 _fonta=new Font("Helvetica", Font.PLAIN, 14);
		 g_.setFont(_fonta);
	     g_.setColor(c_);
	     g_.drawString(_message, 10, 40);
	}
	/**
	* Another painter's helper: Fills in background color
	*
	* @arg g_	The Graphics object to paint on
	* @arg c_	The color to use for painting
	*/
	private void paintBackground(Graphics g_, Color c_){
	     g_.setColor(c_);
	     g_.fillRect(_rect.x, _rect.y, _rect.width, _rect.height);
		
	}
	/**
	* This function makes us "runnable" and is called as a result
	* of calling _thread.start()
	*/
	public void run(){
	     while(true){	// forever is a long time
		  try{
		       _thread.sleep(100 - _speed);
		       _msgX=_msgX -= 1;

			   //_msgX = _msgX -1;	Fnctional Equivalent ??
			   //System.out.println(_msgX);

		       if(_msgX <= -1 * _msgWidth)
			    _msgX = _rect.width;
		       repaint();
		  } 
		  catch(InterruptedException e) { break; }
	     }
	}		
	/**
	* Starts scrolling action by starting our timing thread
	*/
	public void start(){
	     _thread.start();
	}
	/**
	* Stops scrolling
	*/
	public void suspend(){
	     _thread.suspend();
	}
	/**
	* Resumes scrolling after a suspension
	*/
	public void resume(){
	     _thread.resume();
	}


} // end class ScrollText