Hi,
when adding thousends of characters to a JTextPane (Chatlog), resizing
becomes very slowly. 100% of the CPU power is used for one or two
seconds also blocking my application (WinXP, Pentium M 1,3GHz) .
It seems as if the whole text of its document is recalculates for word
and line wrapping. I hoped that only the text represented by the viewport
of a JScrollPane would be recalculated.

Placing JTextPanes
--------------------------------------

   txtDialog = new MyTextPane(sChan);

   scrollDialog = new JScrollPane();
   scrollDialog.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
   scrollDialog.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

   splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, scrollDialog, scrollUser);
   splitPane.setOneTouchExpandable(true);
   scrollDialog.getViewport().setView(txtDialog);

   this.add(splitPane, BorderLayout.CENTER);

MyTextPane itself
--------------------------
...
private StyledDocument document = (StyledDocument)MyTextPane.this.getStyledDocument();
private SimpleAttributeSet attributes = new SimpleAttributeSet();
...
private void insertStr(char ch, String sNewLine) {
   try {
     document.insertString(document.getLength(), "" + ch, attributes);
   } catch (Exception e) {
     System.out.println("Fehler document.insertString: " + e.getMessage());
   }
 }

Before adding the characters to the document, the string is analysed for its attributes
like bold, underline, color, size, font etc.

private void setAttributes() {
   StyleConstants.setFontSize(attributes, iFontSize);
   StyleConstants.setFontFamily(attributes, sFont);
   StyleConstants.setBold(attributes, bBold);
   StyleConstants.setUnderline(attributes, bUnderline);
...

Is there possibility keeping the load low other than limitting the amount of characters?

I appriciate any help you can give me,

Thomas