scrollbar question..

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Frances - 07 Oct 2005 04:02 GMT

how do you get scrollbar to go along w/bottom end of text content in a
JTextPane? i.e., if there is a lot of text in JTextPane I can't see
text at bottom (beyond height of JTextPane..) I have to scroll down to
see where text ends, but I would like scrollbar to 'move' as text is
inserted so end of text is always visible...

I found a JScrollBar class, where I read the following:

An implementation of a scrollbar. The user positions the knob
in the scrollbar to determine the contents of the viewing area.
The program typically adjusts the display so that the end of
the scrollbar represents the end of the displayable contents,
or 100% of the contents.

it seems this is what I'm looking for, just can't find how to set this
up.. I mean if I have a JScrollPane that already includes a scrollbar
how do I use/implement this JScrollBar class? (if I need to... but
don't know if I do..) thank you..

Frances

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Michael Rauscher - 08 Oct 2005 15:42 GMT

Frances schrieb:

> it seems this is what I'm looking for, just can't find how to set this
> up.. I mean if I have a JScrollPane that already includes a scrollbar
> how do I use/implement this JScrollBar class? (if I need to... but
> don't know if I do..) thank you..

You don't need to use JScrollBar directly if you use JScrollPane. The
latter displays the scrollbars accordingly to the "scrollbar policy". By
default JScrollPane displays scrollbars as needed.

E.g.

// Test.java
import javax.swing.*;

public class Test {
public static final void main( String args[] ) {
JPanel panel = new JPanel();
panel.add(new JLabel("A Label that is larger than the frame"));
JFrame frame = new JFrame("Test");
frame.getContentPane().add(new JScrollPane(panel));
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
// EOF: Test.java

If you compile and run this class, you'll get a frame that is large
enough to display the whole label. As soon as you set the window to a
little smaller size, the scrollbar(s) get displayed.

Bye
Michael

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waqas ahmed - 11 Oct 2005 04:03 GMT

Use the following method:

textArea.setCaretPosition(textArea.getDocument().getLength());

> how do you get scrollbar to go along w/bottom end of text content in a
> JTextPane? i.e., if there is a lot of text in JTextPane I can't see
[quoted text clipped - 16 lines]
>
> Frances

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scrollbar question..

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