//******************************************************************************
// Typewriter.java: Applet
//
// Created by Ricardo Basto
// July 14, 1997
//
// You are free to use if no modification is done to the original file
//******************************************************************************

import java.applet.*;
import java.awt.*;
import java.net.*;

public class Typewriter extends Applet implements Runnable
{
	private Thread m_Typewriter = null;

    // Members for applet parameters
    // <type>       <MemberVar>		= <Default Value>
    //--------------------------------------------------------------------------
	private	String	m_Text			= "Ricardo Basto's Typewriter|Please e-mail me at|ricbasto@usa.net|";
	private	String	m_Target		= "mailto:ricbasto@usa.net";
	private Color	m_BGColor		= Color.white;
	private Color	m_FGColor		= Color.black;
	private Color	m_HLColor		= Color.blue;
	private int		m_FontSize		= 20;
	private	String	m_FontName		= "Dialog";
	private int		m_Delay			= 100;

    // Parameter names
    //--------------------------------------------------------------------------
	private final String PARAM_Text = "Text";
	private final String PARAM_Target = "Target";
	private final String PARAM_BGColor = "BGColor";
	private final String PARAM_FGColor = "FGColor";
	private final String PARAM_HLColor = "HLColor";
	private final String PARAM_FontSize = "FontSize";
	private final String PARAM_FontName = "FontName";
	private final String PARAM_Delay = "Delay";

	// Private data members
	//--------------------------------------------------------------------------
	private int StartY = 14;
	private int CurrentY;
	private int lPosition = -1;
	private int LastPos = 0;


	public String getAppletInfo()
	{
		return "Name: Typewriter\r\n" +
		       "Author: Ricardo Basto\r\n" +
		       "Created with Microsoft Visual J++ Version 1.1";
	}

	public String[][] getParameterInfo()
	{
		String[][] info =
		{
			{ PARAM_Text, "String", "The text to be typed" },
			{ PARAM_Target, "String", "Target URL" },
			{ PARAM_BGColor, "int", "Background color" },
			{ PARAM_FGColor, "int", "Foreground color" },
			{ PARAM_HLColor, "int", "Highlight color" },
			{ PARAM_FontSize, "int", "Font size in pixels" },
			{ PARAM_FontName, "String", "Font's typeface name" },
			{ PARAM_Delay, "int", "Typying delay" },
		};
		return info;
	}

	public void init()
	{
		String param;

		// Text: The text to be typed
		//----------------------------------------------------------------------
		param = getParameter(PARAM_Text);
		if (param != null)
			m_Text = param;

		// Text: Target URL
		//----------------------------------------------------------------------
		param = getParameter(PARAM_Target);
		if (param != null)
			m_Target = param;

		// BGColor: Background color
		//----------------------------------------------------------------------
		param = getParameter(PARAM_BGColor);
		if (param != null)
			m_BGColor = new Color(Integer.parseInt(param));

		// FGColor: Foreground color
		//----------------------------------------------------------------------
		param = getParameter(PARAM_FGColor);
		if (param != null)
			m_FGColor = new Color(Integer.parseInt(param));

		// HLColor: Highlight color
		//----------------------------------------------------------------------
		param = getParameter(PARAM_HLColor);
		if (param != null)
			m_HLColor = new Color(Integer.parseInt(param));

		// FontSize: Font size in pixels
		//----------------------------------------------------------------------
		param = getParameter(PARAM_FontSize);
		if (param != null)
			m_FontSize = Integer.parseInt(param);

		// FontName: Font's typeface name
		//----------------------------------------------------------------------
		param = getParameter(PARAM_Text);
		if (param != null)
			m_FontName = param;

		// Delay: Typying delay
		//----------------------------------------------------------------------
		param = getParameter(PARAM_Delay);
		if (param != null)
			m_Delay = Integer.parseInt(param);


		// Parameter Validation
		//----------------------------------------------------------------------
		if (m_Delay < 1) m_Delay = 1;
		if (m_FontSize < 2) m_FontSize = 2;


		// Initialization Code
		//----------------------------------------------------------------------
		StartY = m_FontSize + 2;
		CurrentY = StartY;

		setForeground(m_FGColor);
		setBackground(m_BGColor);
		setFont(new Font(m_FontName, Font.BOLD, m_FontSize));
	}


	// All drawing code is placed in the paint event
	//--------------------------------------------------------------------------
	public void paint(Graphics g)
	{
		if (m_Text.charAt(lPosition) == '|')
		{
			CurrentY-=2;
			if (CurrentY > -3) 
				lPosition--;
			else
			{
				CurrentY = StartY;
				LastPos = ++lPosition;
			}
		}

		g.drawString(m_Text.substring(LastPos, lPosition+1), 0, CurrentY);
	}

	public void start()
	{
		if (m_Typewriter == null)
		{
			m_Typewriter = new Thread(this);
			m_Typewriter.start();
		}
	}
	
	public void stop()
	{
		if (m_Typewriter != null)
		{
			m_Typewriter.stop();
			m_Typewriter = null;
		}
	}

	// All string manipulation code is placed in the thread
	//--------------------------------------------------------------------------
	public void run()
	{
		while (true)
		{
			try
			{
				lPosition++;
				if (lPosition > m_Text.length()) 
				{
					lPosition = -1;
					LastPos = 0;
					Thread.sleep(m_Delay * 10);
				}
				else
				{
					repaint();

					Thread.sleep(m_Delay);
				}
			}
			catch (InterruptedException e)
			{
				stop();
			}
		}
	}

	public boolean mouseDown(Event evt, int x, int y)
	{
		try
		{
			getAppletContext().showDocument(new URL(m_Target));
		}
		catch (MalformedURLException e)
		{
			m_Text = "Error|MalformedURLException|Target URL invalid|";
		}
		return true;
	}

	public boolean mouseEnter(Event evt, int x, int y)
	{
		setForeground(m_HLColor);
		return true;
	}

	public boolean mouseExit(Event evt, int x, int y)
	{
		setForeground(m_FGColor);
		return true;
	}
}