Hi,
I always thought that I do have to set the statement

txtPane.setCaretPosition(txtPane.getDocument().getLength());

for scrolling the text to the last inserted row, but the text
is beeing scolled automatically!

New rows are inserted by

document.insertString(document.getLength(), sTxt + sNewLine, attributes);


sNewLine = "\n\n" or  "\n"

document = (StyledDocument)JTextPane.this.getStyledDocument();

Any idea  how to prevent autoscrolling for this textcomponent?

Thanks in advance,
Thomas

"Thomas Barth" <th.barth@mail.isis.de> schrieb im Newsbeitrag
news:2ojb0kFbc36jU1@uni-berlin.de...
> Hi,
> I always thought that I do have to set the statement
>
> txtPane.setCaretPosition(txtPane.getDocument().getLength());
>
> for scrolling the text to the last inserted row, but the text
> is beeing scolled automatically!
>
> New rows are inserted by
>
> document.insertString(document.getLength(), sTxt + sNewLine, attributes);
>
>
> sNewLine = "\n\n" or  "\n"
>
> document = (StyledDocument)JTextPane.this.getStyledDocument();
>
> Any idea  how to prevent autoscrolling for this textcomponent?

such things made most by calling JComponent#scrollRectToVisible(Rectangle
r);
try to override it to do nothing

-- 
Andrei Kouznetsov
http://uio.dev.java.net Unified I/O for Java
http://reader.imagero.com Java image reader

Thomas Barth <th.barth@mail.isis.de> wrote:
 
> txtPane.setCaretPosition(txtPane.getDocument().getLength());
> 
> for scrolling the text to the last inserted row, but the text
> is beeing scolled automatically!
> 
> New rows are inserted by
> 
> document.insertString(document.getLength(), sTxt + sNewLine, attributes);
> 
> 
> sNewLine = "\n\n" or  "\n"
> 
> document = (StyledDocument)JTextPane.this.getStyledDocument();
> 
> Any idea  how to prevent autoscrolling for this textcomponent?


Change its Caret (DefaultCaret.ensureVisibility).



Christian

>
>
> Change its Caret (DefaultCaret.ensureVisibility).

txtPane.getCaret().setVisible(true);?

It doesn't work. What does the visibility of texpanes caret have to do with the scrolling function?

The text is still scrolled to the the inserted row. For month I have tested inserted lines in a jtextpane

 and I always could switch between true or false for scrolling

if (bAutoScroll) {

  txtPane.setCaretPosition(txtPane.getDocument().getLength());

}



Thomas

Thomas Barth <th.barth@mail.isis.de> wrote:
> 
>>
>>
>> Change its Caret (DefaultCaret.ensureVisibility).
                                  ^^^^^^
should be "adjust".
 
> txtPane.getCaret().setVisible(true);?

No.
 
> It doesn't work. What does the visibility of texpanes caret have to do with the scrolling function?

The automatic scrolling is caused by DefaultCaret.adjustVisibility (which
has nothing to do with set/isVisible).

 
> The text is still scrolled to the the inserted row. For month I have tested inserted lines in a jtextpane
> 
> and I always could switch between true or false for scrolling
> 
> if (bAutoScroll) {
> 
>  txtPane.setCaretPosition(txtPane.getDocument().getLength());
> 
> }

That does not enable/disable scrolling. It sets the caret to the
end, therefore the end is made visible by DefaultCaret.adjust-
Visibility. If the Caret happened to be at the end before that
call (as it may well be), the call has no effect.

Read the thread starting with

http://groups.google.com/groups?selm=3C04EEE5.9893AFC1%40addcom.de


Christian

Hi Christian,

I don't get it. In the API I can read the following comment for adjustVisibility:
"Scrolls the associated view (if necessary) to make the caret visible. Since
 how this should be done is somewhat of a policy, this method can be
reimplemented to change the behavior. By default the scrollRectToVisible
method is called on the associated component. "

I replementated the method adjustVisibility for invocation

MyTextPane txtPane = new MyTextPane();
txtPane.adjustVisibility(null);

class MyTextPane extends JTextPane {

  public void adjustVisibility(Rectangle rec) {

  }
}

But it's still scrolling! :-)

Thomas

> I don't get it. In the API I can read the following comment for
adjustVisibility:
> "Scrolls the associated view (if necessary) to make the caret visible.
Since
>  how this should be done is somewhat of a policy, this method can be
> reimplemented to change the behavior. By default the scrollRectToVisible
> method is called on the associated component. "
>
> I replementated the method adjustVisibility for invocation
>
> MyTextPane txtPane = new MyTextPane();
> txtPane.adjustVisibility(null);
>
> class MyTextPane extends JTextPane {
>
>   public void adjustVisibility(Rectangle rec) {
>
>   }
> }
>
> But it's still scrolling! :-)

adjustVisibility is method of DefaultCaret, not of JTextPane.
as I also mentioned you can override scrollRectToVisible of JTextPane.
Or you can install your own Caret with empty adjustVisibility.

class NonSrollingCaret extends DefaultCaret {
public void adjustVisibility(Rectangle rec) {}
}

JTextPane textPane = new JTextPane();
textPane.setCaret(new NonSrollingCaret());

-- 
Andrei Kouznetsov
http://uio.dev.java.net Unified I/O for Java
http://reader.imagero.com Java image reader