Finding the position of the end of a line in a JTextPane

I'm trying to make a JTextPane which expands horizontally if the text being typed in it reaches the right hand edge. To do this I need to know the position in the Document of the end of the current line.
I've managed to write a method which expands the JTextPane vertically using getEndPosition() in AbstractDocument.
There is an endLineAction in the DefaultEditorKit which moves the Caret to the end of the line but I don't want to move the Caret, just find the position of the end of the line. I did have a method before which moved the Caret to the end of the line, stored the position and moved it back but that wasn't suitable.
I suspected the answer was to do with the View but I can't figure out how the View relates to the JTextPane or Document.
Can anyone help?

Well, personally I don't think its a good idea to keep changing the size of the text pane as text is being typed and I doubt the solution will be as easy as you think.
As you type the text will automatically wrap so it will be a little late trying to change the width after the text has wrapped, which means you would need to increase the width "before" text is typed. But then you have another problem because you don't know how much to increase the width by since a single character could be typed or a string of text could be pasted into the text area (people always forget about pasting when doing stuff like this).
Also if text is removed you would need to iterate through all the line to find the longest line and reset the width.
Anyway the only way to know the width would be to play with the modelToView() method. If you want to find the end of the current line then you can use the Element.
Check out my [Text Utilities|http://www.camick.com/java/blog.html?name=text-utilities] class which might give you some ideas on how to use the Element class and modelToView() method.
which has example of using the above Class and method that might give you some ideas.

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