TextArea Mouse Position

add the following methods to your MouseListener

public void mouseClicked(MouseEvent event)
{
}

public void mouseEntered(MouseEvent event)
{
}

public void mouseExited(MouseEvent event)
{
}

public void mousePressed(MouseEvent event)
{
 }

public void mouseReleased(MouseEvent event)
{
}

To be notified of mouse movement you will also need to impleement MouseMotionListener

http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/MouseMotionListener.html


some background on implementing mouse listeners

http://java.sun.com/docs/books/tutorial/post1.0/ui/mouselistener.html

Yah, i figured that out a few minutes ago...below is my current code, however, the problem I have with it is this, it doesnt get the columns correctly. I was trying to have 25 cols....however, only 21 are displayed...


import java.applet.Applet;
import java.awt.*;          
import java.awt.event.*;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.FontMetrics;
import java.awt.Font;


public class mathDesign extends Applet  
{  
   /* these variables are used to keep track of what the user is doing */
   boolean allowedToDraw = false;
   boolean drawingLine = false;
   int drawingObject = 0;
   
   
   int numRows = 25;
   int numCols = 75;
   int textWidth;
   int textHeight;
   
   char myCanvas[][] = new char [numRows][numCols];
   char myTmpCanvas[][] = new char [numRows][numCols];
   
   Button    drawLineButton           = new Button("Draw Line");
   Button    insertLabelButton        = new Button("Insert Label");
   
   TextArea  textCanvas               = new TextArea(
                                            "Loading...",
                                            numRows ,
                                             numCols+1,
                                            TextArea.SCROLLBARS_VERTICAL_ONLY
                                          );
   Label statusHeader = new Label("Status: ");
   Label statusLabel = new Label("");
   
   Label fillChar_label = new Label("Fill Char: ");
   TextField fillChar_text = new TextField(1);
   Label labelStart = new Label("Label: ");
   TextField labelStart_text = new TextField(1);

 
     
   public void init( )
   {      
      add(drawLineButton);
      //drawLineButton.setEnabled(false);
     
           
      /* dont allow user to edit the text box */
      /* all functions should be available to allow user to make changes */
      textCanvas.setEditable(false);
      textCanvas.setFont(Font.decode("Monospaced"));

   
     
      add(fillChar_label);
     
      fillChar_text.setText("*");
      add(fillChar_text);
     
      /* get font metrics */
      FontMetrics currentMetrics = getFontMetrics(Font.decode("Monospaced"));
      textWidth = currentMetrics.charWidth('A');
      textHeight = currentMetrics.getHeight();
           
     
      addNewLine( );
      add(insertLabelButton);
     
      labelStart_text.setText("A");
      add(labelStart);
      add(labelStart_text);
      addNewLine( );
     
      statusHeader.setAlignment(statusHeader.LEFT);
      add(statusHeader);
     
      statusLabel.setAlignment(statusLabel.LEFT);
      statusLabel.setSize(100,10);
      add(statusLabel);
     
      addNewLine( );
     
      add(textCanvas);
     
      addNewLine( );
     
      drawLineButton.addActionListener(new drawLineListner( ));
      textCanvas.setText("Loading MathDesign applet...");
      textCanvas.addMouseListener( new myMouseListner() );
      textCanvas.addMouseMotionListener(new myMouseMotion() );
     
      clearCanvas(myCanvas,numRows,numCols);
      copyCanvas(myTmpCanvas,myCanvas,numRows,numCols);
      displayCanvas(myCanvas,numRows,numCols);
      setStatus("Ready");
   }
 
   private void setStatus(String myStatus)
   {
       statusLabel.setText(myStatus);      
   }
   
   //will copy what is in the 2 dimensional array into the text area
   //it will stop at row r.
   private void displayCanvas(char theCanvas[][],int r,int c)
   {
       StringBuilder tmp = new StringBuilder();
         for (int i = 0; i < (r);++i )
         {
             tmp.append(theCanvas[i]).append("\n");
          }
     
       textCanvas.setText(tmp.toString());
   }
   
   
   
   private void clearCanvas(char theCanvas[][],int r, int c)
   {
          for (int i = 0; i < (r); ++i )
          {
            for (int j = 0; j < (c); ++j )
            {
                    theCanvas[i][j] = 'W';
            }
          }
   }
   
   /* ASSUMES BOTH ARRAYS HAVE THE SAME SIZE!!!!!! */
   private void copyCanvas(char dest[][], char from[][], int r, int c)
   {
         for (int i = 0; i < (r); ++i )
          {
            for (int j = 0; j < (c); ++j )
            {
                dest[i][j] = from[i][j];
            }
          }
             
   }
   
   
   class drawLineListner implements ActionListener
   {
      public void actionPerformed(ActionEvent event)
      {
          setStatus("Ready to draw line, click a point to start drawing.");
          allowedToDraw = true;
      }                  
   }
   
  class myMouseListner implements MouseListener
   {
    public void mouseClicked (MouseEvent me)
    {
        a(me);
   
    }
    public void mousePressed (MouseEvent me) {}
    public void mouseReleased (MouseEvent me) {}  
    public void mouseEntered (MouseEvent me) {}
    public void mouseExited (MouseEvent me) {}
   }
 
  class myMouseMotion implements MouseMotionListener
  {
      public void mouseMoved(MouseEvent me)
      {
           if (!allowedToDraw)
               a(me);  
      }
      public void mouseDragged(MouseEvent me){}
  }
 
  private void a(MouseEvent m)
  {
        StringBuilder tmp = new StringBuilder();
         int xpos = m.getX();
         int ypos =m.getY();
         int row = getRow(m);
         int col = getCol(m);
         
         tmp.append(xpos);
         tmp.append(",");
         tmp.append(ypos);
         tmp.append("(");
         tmp.append(row);
         tmp.append(",");
         tmp.append(col);
         tmp.append(")");
     
         setStatus(tmp.toString());
     
     
  }
 
   private int getRow(MouseEvent m)
   {
       int y = m.getY();
       int row = 0;
       if (textHeight!=0)
        row = y/textHeight;
       return row;
   }
   
   private int getCol(MouseEvent m)
   {
       int x = m.getX();
       int col = 0;
       if (textHeight!=0)
        col = x/textWidth;
       return col;
   }
   private void addHorizontalLine(Color c)
   {  
      Canvas line = new Canvas( );
      line.setSize(10000,1);
      line.setBackground(c);
      add(line);
   }
   
   private void addNewLine( )
   {  
      addHorizontalLine(getBackground( ));
   }

     
}