Thanks for the links Glenn. I've already read Knuth's paper and I understand
how it works. FOP implementation is also clear to me, more or less...I'm not
trying to reinvent Knuth algorithm neither to modify it, all I want is to
know how to create a layout manager for my <fox:best-fit-block> element. The
latter is too simple, it doesn't have any FO properties and can only contain
a single <fo:block>.
I managed to write the following class but it doesn't generate any content
in the output document:
public class BestFitBlockLayoutManager extends AbstractLayoutManager {
static Log log = LogFactory.getLog(BestFitBlockLayoutManager.class);
public BestFitBlockLayoutManager(BestFitBlock node) {
super(node);
}
/** {@inheritDoc} */
public List getNextKnuthElements(LayoutContext context, int alignment) {
if (isFinished())
return null;
List returnList = null;
if (getChildLM() != null) {
returnList = getChildLM().getNextKnuthElements(context,
alignment);
// add a penalty element, representing a forced page break
returnList.add(new BreakElement(new NonLeafPosition(this, new
Position(this)),
Constants.EN_PAGE, -KnuthElement.INFINITE, EN_PAGE,
context));
}
setFinished(true);
notifyEndOfLayout();
return returnList;
}
}
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