java again, JScrollPane's

[abc123]

I have given a JTextArea to a JScrollPane so i can scroll it, but, because the Jtextarea (x) receives data without me typing it in it, it will not automatically adjust the "viewport" so i permenantly stuck at the top of the damn thing

i have tried looking in the api numerous times but i can't figure out how to re-adjust it

i briefly tried getting the number of lines in x (x.getLineCount()) but this gave me very weird numbers in a rather odd pattern so i am completely confused

anyone got any clues?

[technobard]

My Swing knowledge is severely limited, so take this with a grain of salt. From your text it looks like you might be using a constructor where the only parameter is the String to populate the JtextArea. There is another constructor which allows you to specify an initial row, column and text. You might try that.

Also, can you post the code (or a suitable portion)?

[abc123]

heh, i also hate the gui area of java, anyhow here is some code:

private JTextArea output; //the text area in question

output = new JTextArea(); //constructing it in another method somewhere
p.add(new JScrollPane(output), GDC); //adding it to my JPanel with GridBagConstraints

// in an inner class...
inData = in.readLine().trim().toLowerCase();
print(output, inData); //a print method i have

private void print(JTextArea jt, String s) //the print method
{
        jt.setText(jt.getText()+s+"\n");
}

that is pretty much all the neccessary code, im not sure if it makes any sense


but basically the inner class area is always calling the "print" method while data is coming in from the socket (in).. it may be better to use jt.append in the print method so i will try that now but i don't think that'll fix the prob

thanks for ur help

--- EDIT ---
.append() did nothing

[technobard]

I think I get it. It sounds like you need to refresh the JScrollPane after updating it. You could either use a listener or just call the JScrollPane.revalidate() method followed by the .repaint() method. Also, I still think you need to initialize the size of either the JTextArea or of the JScrollPane. I saw some reference to making sure you do this on the Sun website, but not what the consequences are. JScrollPane.setPreferredSize(rowsize, columnsize) can be used, for example.

Good luck. Let me know how it turns out.

[abc123]

fixed it with this:

JScrollPane jsOut = new JScrollPane(yep);
jsOut.getVerticalScrollBar().setValue(jsOut.getVerticalScrollBar().getMaximum());