// ScrollDemo.java
// A simple JScrollPane demonstration.
//
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class ScrollDemo 
{public JFrame prozor_sus = new JFrame("SUSTAV");
	int n=0;
  public JTextField [][] TextBox ;
  public static JScrollPane scrollpane;
  public static JPanel p = new JPanel();
  public ScrollDemo() {
	  prozor_sus.setSize(1000, 700);
	
    init(15 );
    prozor_sus.setVisible(true);
  }

  
  
  
  public void init(int n1) {
	 
		  n= n1;
	   KeyListener listener = new KeyListener() {
		   public void keyPressed(KeyEvent e  ) {
		   String ime= e.getComponent().getName();
	       String br=ime.substring(7,  ime.length());
		   int  ibr= Integer.valueOf(br);
		   int i = (int)((ibr-1)/(n+1));
		   int j= ibr-(n+1)*i-1;
		  if (j<0)
		    {
		    	j=0;
		    }
	       if (e.getKeyCode()==39  ||  e.getKeyCode()==10)
		     {
                j++;
		 		  if (j>n)
	                {
		        	 j=0;
		        	 i++;		        	         	 
		             }
		 		  if(i>=n)
		 		  {
		 			  i=n-1;
		 		  }
 		  TextBox[i][j].requestFocus();
     	     }
		     if (e.getKeyCode()==37)
		     {
		    	  j--;
		          	 if(j<0)
		        	 {
		        	 j=n;
                   i--;
		        	 }
		             if (i<0)
		             {
		            	 i=0;
		            	 
		             }
	
		    	 TextBox[i][j].requestFocus();
		     }	  
		    	  
		     if (e.getKeyCode()==38)
		     {
		    
		    	 i--;
		    	 if (i<0)
		    	 {
		    		 i=0;
		    		 
		    	 }
		    	 
		    	 
		    	 TextBox[i][j].requestFocus();
			     }
		    	
		     if (e.getKeyCode()==40)
		     {
		    
		    	 i++;
		    	 if( i >=n )
		    	 {
		    		 i=n-1;
		    		 
		    		 
		    	 }
		    	 
		    	 TextBox[i][j].requestFocus();
		    	 
		    	 
		     }

		     }
		  
 public void keyReleased(KeyEvent e) {
		   String ime= e.getComponent().getName();
		   String br=ime.substring(7,  ime.length());
	        int  ibr= Integer.valueOf(br);
		    int i = (int)((ibr-1)/(n+1));
		    int j= ibr-(n+1)*i-1;
		    if (j<0)
		    {
		    	j=0;
		    	
		    }

		     if (! ((  (e.getKeyChar() >= '0') && (e.getKeyChar()<= '9')) || (e.getKeyChar() == '.') || (e.getKeyChar() == '-') || (e.getKeyCode()==40  || e.getKeyCode()==37 || e.getKeyCode()==38 || e.getKeyCode()==39)   ) ) 
			 	{			
			
			 String text= TextBox[i][j].getText();
	    	 try
	    	 {
			 text=text.substring(0, text.length()-1);
	    	 }
	    	 catch(Exception ep)
	    	 {
	    	System.out.println(ep.getMessage());	 
	    	 }
			 TextBox[i][j].setText( text );
	    	 
			 	}
		   
		      }
 

public void keyTyped(KeyEvent e) {
		      
		      }

		   
		  };

	  int duzina_ulaza=120;
	 int  visina_ulaz=25;
    
    p.setSize(duzina_ulaza*(n1)+140, visina_ulaz*(n1)+100);
    GridLayout gl = new GridLayout(n1,n1+1,5,2);
 
  // gl.minimumLayoutSize( new Dimension(120,25);
    gl.minimumLayoutSize( new Container() );
   
    p.setLayout(gl);
   
   // p.
    
    
   // p.setLayout(new GridLayout(n1, n1+1,5,2));
  
    TextBox= new  JTextField[n1][n1+1];
    int k=0 ;
    int  j=0;
     for( k=0; k<=n1-1; k++)
		{
		  for(j=0;j<=n1;j++)
		  { 
     String ime= "TextBox"+String.valueOf((n1+1)*(k)+j+1);
    	TextBox[k][j]= new JTextField();	  
        TextBox[k][j].setBounds(duzina_ulaza*(j)+40 , visina_ulaz*(k)+60, duzina_ulaza-10, visina_ulaz-3);
		TextBox[k][j].setBackground(Color.white) ;
		TextBox[k][j].setName(ime);
	    TextBox[k][j].setMinimumSize( new Dimension(120,25));
		TextBox[k][j].setMaximumSize(new Dimension(120,25));
	    TextBox[k][j].setAutoscrolls(false);
	   // TextBox[k][j].setIgnoreRepaint(true);
	    //TextBox[k][j].setSize(120,25);
		TextBox[k][j].setText(" ");
		TextBox[k][j].addKeyListener(listener);
	    
		p.add(TextBox[k][j],n1*k+j);
	 	
	      
       	}	
		
	    }
    
     scrollpane = new JScrollPane(p);
    // scrollpane.add(p);
   
    prozor_sus.add(scrollpane);
    

    
  }

 
 
}