How to draw line sign on char when writing text in j2me

[iraqy2010]

Hi my friends
I am trying to write text editor in j2me
I need to draw line sign on the char and move the line by pressing
key right and left
This some code to draw line in main class

 e = new LineEnumeration(inputFont,currentString,inputWidth-50,g);
 
          if(caretBlinkOn && goToNextChar)
                        {
     g.drawLine(e.pr(),e.ca,e.pr(),e.ca+inputFont.getHeight());


                        }

And this cpde of class for warping text

public class LineEnumeration implements Enumeration
{    private Font font;
     private String text1;
     private int width;
     private int position=0;
     private int length;
     int  ff;
     private int start = 0;
     int ca=10;
     boolean b=false;
    int c1;
    int caretLef=0;
String s[]= 
{"","","","","","","","","","","","","","","","","","","","","","" 
,"","","","","","","","","","","","","","","","",""};
String ss;
String sss="";
int d=-1;


     public LineEnumeration(Font font, String text, int  
width,Graphics h)
     {

         this.font = font;
         this.text1 = text;
         h.setFont(font);
         this.width = width;
         this.length = text.length();
     }
   
     public boolean hasMoreElements()
     {
    return (position < (length));
     }
     public Object nextElement()
             throws NoSuchElementException
     {         try {
                   d++;
                   if(d!=0)
                   {
                   ca=ca+font.getHeight();
                   }
                 s[d]=text1.substring(start,start = next());
                
                 return  s[d];

                   }
              catch ( IndexOutOfBoundsException e )
              {
                  throw new NoSuchElementException(e.getMessage 
());
              }
      catch ( Exception e ) {
    throw new NoSuchElementException(e.getMessage());
              }
     }
    

    public void proky(int a)
    {
     
       if(c1>s[d].length())
        {d--;
 
        ca=ca-font.getHeight();
        }
     caretLef=font.substringWidth(s[d],0,a);


    }
   
    public int pr(){
    return caretLef;
    }


 
           }

And this code to process keypress

  if(keyName.equals("Right") )
       {
       c++;
     e.proky(c);
     //System.out.println("else"+e.pr());
       }

But not work correctly
Please any one edit on my code or hint on code to solve my problem

[skalogir]

Hi iraqy2010,

You could use the following code:

Midlet:

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;


public class CanvasMIDlet extends MIDlet implements CommandListener {
	
	customCanvas canvas;
	private Display display;
	Command cmd=new Command("OK",Command.OK,0);
	
	public void startApp()
	{
		canvas = new customCanvas();
		display = Display.getDisplay(this);
		display.setCurrent(canvas);
		canvas.addCommand(cmd);
		canvas.setCommandListener(this);
	}

	  public void pauseApp(){}

	  public void destroyApp(boolean unconditional){}

	  public void commandAction(Command c, Displayable d) 
	  {
		if(c==cmd)
		{
			canvas.keyPressed(2);
		}
		
	  }

}

Canvas:

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;


public class customCanvas extends Canvas implements Runnable 
{
	int fontheight;
	
	int currentline;
	int currentrow;
	
	int linesize;
	int rows;
	Thread thread;
	boolean showline;
	customCanvas()
	{
		Font font=Font.getDefaultFont();
		fontheight=font.getHeight();
		
		linesize=(getWidth()-2);		
		rows=getHeight()/fontheight;
		
		currentline=1;
		currentrow=1;
		thread=new Thread(this);
		thread.start();
		showline=true;
		
	}
	  public void paint(Graphics g)
	  {
		  int width = getWidth();
		  int height = getHeight();
		  g.setColor(255, 0, 0);
		  g.fillRect(0, 0, width - 1, height - 1);
		  g.setColor(0, 0, 255);
		  g.drawRect(0, 0, width - 1, height - 1);

		  if(showline)
			  g.setColor(255,0,0);
		  else
			  g.setColor(0,0,255);
		
		  g.drawLine(currentline, currentrow*fontheight,currentline,(currentrow-1)*fontheight);
		  
	  }
	  protected void Up()
	  {
		  if(currentrow>1)
			  currentrow--;
		  
		  repaint();
	  }
	  
	  protected void Down()
	  {
		  if(currentrow<rows)
			  currentrow++;
		  
		  repaint();
	  }
	  protected void Left()
	  {
		  if(currentline>5)
			  currentline=currentline-5;
		  
		  repaint();
	  }
	  protected void Right()
	  {
		  if(currentline<linesize-5)
			  currentline=currentline+5;
		  
		  repaint();
	  }
	  protected void keyPressed(int keyCode)
	  {
		  if(keyCode==-1)
			  Up();
		  if(keyCode==-2)
			  Down();
		  if(keyCode==-3)
			  Left();
		  if(keyCode==-4)
			  Right();
	  }
	public void run() {
		while(true)
		{
		try 
		{
			if(showline)
				showline=false;
			else
				showline=true;
			
			repaint();
			Thread.sleep(500);
		} catch (InterruptedException e) {}
		}
	}
}