scrollpane not scrolling

[Nikos Stavros]

my Jtext area does not scroll when overflowing, any ideas?

package testers;
 
import javax.swing.*;
 
import graphics_serious.PulseTrainDisplay;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
//import ij.gui.GenericDialog;
//import ij.io.OpenDialog;
//import ij.io.SaveDialog;
import java.awt.*;
 

import javax.swing.JFileChooser;
 

public class Scroller extends JFrame{
 
private JFileChooser fc;
privateJTextArea jTextArea;
privateJButton open;
privateJTextField risingETV, fallingETV, risingMinV, fallingMinV;
private JLabel risingET, fallingET, risingMin, fallingMin, blank;
private Container contentPane;
private JPanel basics;

public Scroller(){
contentPane = this.getContentPane();
contentPane.setLayout(new BorderLayout());
basics = new JPanel(new GridLayout(5,2));
fc = new  JFileChooser();
risingET = new JLabel("Rising Edge Threshold"); 
fallingET = new JLabel("Falling Edge Threshold");
risingMin = new JLabel("Raised state Min Points");
fallingMin = new JLabel("Lowered state Min Points");
blank = new JLabel("");


risingETV = new JTextField();
fallingETV = new JTextField();
risingMinV = new JTextField();
fallingMinV  = new JTextField();

basics.add(risingET);
basics.add(risingETV);
basics.add(risingMin);
basics.add(risingMinV);
basics.add(fallingET);
basics.add(fallingETV);
basics.add(fallingMin);
basics.add(fallingMinV);


open = new JButton("Open File");
basics.add(open);
contentPane.add(basics, BorderLayout.NORTH);

jTextArea = new JTextArea();
Dimension d = new Dimension(100,100);
jTextArea.setPreferredSize(d);


///////////////////////////------------------------------------


contentPane.add(new JScrollPane(jTextArea),BorderLayout.SOUTH);



setVisible(true);
pack();
}
public static void main(String[] args){
new Scroller();
}

}
 

    

[Campbell Ritchie]

You haven't put any scrolling components onto your app.
Have a look at JScrollPane in the API.

[Michael Dunn]

give the preferredSize to the scrollpane, not the textArea

replace
jTextArea = new JTextArea();
Dimension d = new Dimension(100,100);
jTextArea.setPreferredSize(d);
contentPane.add(new JScrollPane(jTextArea),BorderLayout.SOUTH);

with this
jTextArea = new JTextArea();
JScrollPane sp = new JScrollPane(jTextArea);
Dimension d = new Dimension(100,100);
sp.setPreferredSize(d);
contentPane.add(sp,BorderLayout.SOUTH);

[Nikos Stavros]

Thanks, thats great. I wonder why thats the only way it works.

I have another question. How do you write a new line to a JTextArea, similar to System.out.println.

[Campbell Ritchie]

How do you write a new line to a JTextArea

Let's see if I can get it right this time; I was mistaken earlier.

What about the append method?

[Nikos Stavros]

yes that works by using

  \n  

but it seems rather clumsy.

How would you go about enabling a right mouse click over a JTextArea to bring a copy past menu. Is there code avail that does this

[ July 04, 2006: Message edited by: Nikos Katsikanis ]
[ July 04, 2006: Message edited by: Nikos Katsikanis ]

[Michael Dunn]

> How would you go about enabling a right mouse click over a JTextArea to bring a copy past menu.
> Is there code avail that does this

Nothing standard, but not difficult to do with a JPopupMenu