Clearing the viewport of a JScrollPane

Question

Please bear with me on this post; I'm having trouble explaining this.
I'm writing an application that displays text in a JTextFrame, which is attached to a JScrollPane for scrolling. The program needs to allow the user to clear the viewport, without actually deleting any text from the underlying document.
Essentially, when the user presses a button, I want the viewport to scroll past the end of the document, which would simulate the viewport being cleared. If the user then scrolled up one line, they'd see the last line of the document. Here's a little ASCII drawing to explain it a little better:
+--------+
|Data in |
|the     |
|document|
+========+
|        | <-- Empty viewport, and the next line up is the last line in
|        |     the document.
+--------+Any help would be greatly appreciated.
Thanks...

Answer 1

Aranor,
if i understand you correctly you are using a
JTextArea (not a JTextFrame).
to scroll to the end of the text you need to do a
textArea.setCaretPosition(lengthOfText);
thomasSorry, that was a typo. It's a JTextPane that's embedded in the JScrollPane, not a JTextFrame. And I don't need to set the carat to the end of the text, I need to scroll past it (please see above).