Total Java Scripts/Total Java Scripts.iso/JavaApplets/messages/Typewriter/Typewriter.java

Java Source | 1998-10-31 | 6.1 KB | 233 lines

//******************************************************************************
// 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|[e-mail]|";
    private    String    m_Target        = "mailto:[e-mail]";
    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;
    }
}