JTextPane, how to set only a part of text editable?

Question

How to set only a part of text in JTextPane editable? For example I want to forbid changing text after 'enter'. JTextPane has method setEditable but this works only for whole JTextPane.
Plz help!!!

Answer 1

I'm working on some application similar to unix console. It can't be done relatively simply with the provided components (for example two textfileds), but then it will not look like console :) .
Now some technical problems:
Anyway, use a DocumentListener and have it ignore any changes
in areas you deem to be protected.I have no idea how to ignore changes using DocumentListener. Could you give more information abut this?
I found "my own way". I create MyDefaultStyledDocument which extends DefaultStyledDocument. Then I overwrite two methods: insertString and remove. Using offsets values I manage to block everything before " > ", and I protect output from editing. But I still have a problem:
This works fine (add "> " to JTextPane text):
            String s = console.getText();
            s = s+"> ";
            console.setText(s); but this doesn't work (for example replace last word):
                String all = parent.getText();
                all = all.substring(0,all.length() - cut);
                all = all+text+" ";
                parent.setText(all);where: parent = console = JTextPane
Why?
And one more question. Why when I typed "enter", Document remove all text and paste it again :/