tab stops ?

[fullmetalcoder]

But this doesn't help since, it doesn't allow me to clampse the text to the right border of the text.

I'm afraid this is not the purpose of tabs. You'll probably have to play with tables/frames and alignment attributes to achieve that or you'll have to work at a lower level (QAbstractTextDocumentLayout for instance) and tweak the behavior of the document framework so that tabs mean what you want them to but that won't be easy.

Plus I wasn't able to figure out how to set the QTextDocument format in order that it would have the dimension of an A4 sheet.

QTextDocument::setPageSize(const QSize&) maybe?