Question

Looking for Java Applet...

Asked by: mtech

Some time ago I found and used a free java applet that allowed the contents of one html page (including graphics and links) to be scrolled through a defined area at a defined speed. It looked a bit like a marquee tag but maintained all the layout and formatting of the source page - including still working links.

Unfortunately I have lost this code and have been unable to locate it again. Does anyone know where I can get it or something similar - needs to be cross browser compat.

thanks
mtech

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Asked On
2001-03-16 at 01:56:03ID20092559
Tags

marquee

,

java

Topics

Java Programming Language

,

New to Java Programming

Participating Experts
2
Points
50
Comments
5

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Answers

 

by: scientistPosted on 2001-03-16 at 12:00:45ID: 5935877

You can learn to write applet by studying the tutorial for applet provided by number of sites:
The Links are:
http://java.sun.com/docs/books/tutorial/applet/index.html
These people gives you number of sites providing free appletes and applet tutorials:
http://www.freesitetools.com/programming_languages/java/applets.html

 

by: omry_yPosted on 2001-03-16 at 12:40:57ID: 5935955

this is a Java applet I once wrote that scroll text.
it does not support graphics or links, though.

------------------------------------------------
this applet accept three parameters at the html :

speed : the speed of the scrolling.
delay : ms to delay when a line got to the top of the applet.
filename : the headlines filename on the server, a headlines files is a text file, where each line is
a headline.
new line (enter)  seperate headlines.

example :

-- headlines.txt begin --
new! scroller applet by the man!
blah!
blah!
another blah!!




-- headlines.txt end --

I put some extra lines to make it nice.
this file goes to the applet codebase on the http server.

feel free to modify it, but leave the comment specifying I am the author.
(you may want to change colors and stuff)


//-------------- scroller.java begin ---


/*
   Scroller applet , Omry Yadan 2000.
*/


import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;
import java.util.*;
import java.io.*;

public class scroller extends Applet implements Runnable
{
       private volatile Thread scroller;

       int speed;
       int delay;
       String filename;


       Vector strings = new Vector();
       boolean headline_at_top = false; // when head line at top, its time to pause (wait the dalay)
       int current_shown_line = 0;
       int current_line_pos = 0; // 0 is the buttom of the applet.

       final int headlines_gap = 5; // gap in pixels between headlines.
       final int line_height = 20;


       //Get a parameter value
       public String getParameter(String key, String def)
       {
               return  getParameter(key) != null ? getParameter(key) : def;
       }

       //Construct the applet
       public scroller()
       {
       }

       //Initialize the applet
       public void init()
       {
               try
               {
                       speed = Integer.parseInt(this.getParameter("speed", "5"));
               }
               catch(Exception e)
               {
                       e.printStackTrace();
               }
               try { speed = Integer.parseInt(this.getParameter("speed", "5")); } catch (Exception
e) { e.printStackTrace(); }
               try
               {
                       delay = Integer.parseInt(this.getParameter("delay", "500"));
               }
               catch(Exception e)
               {
                       e.printStackTrace();
               }
               try { delay = Integer.parseInt(this.getParameter("delay", "500")); } catch (Exception
e) { e.printStackTrace(); }
               try
               {
                       filename = this.getParameter("filename", "headlines.txt");
               }
               catch(Exception e)
               {
                       e.printStackTrace();
               }

               try
               {
                       loadHeadlines();
                       jbInit();
               }
               catch(Exception e)
               {
                       e.printStackTrace();
               }
       }

       //Component initialization
       private void jbInit() throws Exception
       {
       }

       public void reshape(int x, int y, int w, int h)
       {
               super.reshape(x,y,w,h);
               current_line_pos= bounds().height;
       }

               //Start the applet
       public void start()
       {
               scroller = new Thread(this);
               scroller.start();
       }

       //Stop the applet
       public void stop()
       {
               scroller = null;
       }

       //Destroy the applet
       public void destroy()
       {
       }

       //Get Applet information
       public String getAppletInfo()
       {
               return "Applet Information";
       }

       //Get parameter info
       public String[][] getParameterInfo()
       {
               String[][] pinfo =
                       {
                       {"speed", "int", "1 to 10"},
                       {"delay", "int", ""},
                       {"filename", "String", ""},
                       };
               return pinfo;
       }

       private void loadHeadlines()
       {
               try {
                   URL headlines = new URL(getCodeBase(),filename);
                   DataInputStream text=new DataInputStream(new BufferedInputStream(headlines.openStream()));
                   String s = null;
                   while((s = text.readLine()) != null)
                   {
                           strings.addElement(s);
                   }
               }
               catch (Exception ex) {
                     ex.printStackTrace();
               }
       }


       public void run()
       {
               Thread thisThread = Thread.currentThread();
               while (scroller == thisThread)
               {
                       try
                       {
                               thisThread.sleep(speed * 10);
                               if(headline_at_top)
                               {
                                       Object first = strings.elementAt(0);
                                       strings.removeElementAt(0);
                                       strings.addElement(first);
                                       System.err.println(strings);
                                       thisThread.sleep(delay);
                                       headline_at_top = false;
                                       current_line_pos += heightOf(current_shown_line);
                                       System.err.println("");
                                       current_shown_line++;
                               }
                       }
                       catch (InterruptedException e){}
                       repaint();
                       current_line_pos--;
               }
        }

       private int heightOf(int index)
       {
               return line_height; // currently hardcoded, should be implemented better.
       }

       public void paint(Graphics g)
       {
               int y = 0;

               if(current_line_pos <= 0)
                                   headline_at_top = true;


               for (int i =0;i<strings.size();i++ )
               {
                       String line = (String)strings.elementAt(i);
                       g.drawString(line,5,current_line_pos + line_height * i);
              }
       }

}


//-------------- scroller.java end ----

 

by: mtechPosted on 2001-03-20 at 07:31:09ID: 5942802

Ah

Found one myself (AXScroller 3.0) at http://javaboutique.internet.com/text/Vert/AXScroller/

Thanks
mtech

 

by: omry_yPosted on 2001-03-20 at 07:35:19ID: 5942816

yeah, and what are you going to do with the question?

 

by: mtechPosted on 2001-03-21 at 07:09:47ID: 5946089

Well - let me see..

omry y
provided me with a script that was not what I needed, but similar to what I wanted

scientist
pointed me to some links on how to learn java - definitely not what I wanted

I could ask for the points to be refunded but I think to be fair to omry y I will give him the points. I only posted the solution I found so that the question has some value at a later date.
mtech

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