public boolean step() throws SyntaxError {
Note note = diagram.getDataProvider().getNote();
if (note != null) {
freeNoteNumber = Math.max(freeNoteNumber, note.getNumber() + 1);
diagram.getPaintDevice().addSequenceElement(note);
notes.add(note);
closeNote(note.getLocation().getName());
diagram.getFragmentManager().openFragments();
diagram.getPaintDevice().announce(note.getHeight());
note.setTop(diagram.getVerticalPosition());
if (note.isConsuming()) {
diagram.extendLifelines(note.getHeight());
} else {
pendingNotes.put(note.getLocation().getName(), note);
}
if (diagram.getDataProvider().getState() != null) {
diagram.addToStateMap(note, diagram.getDataProvider().getState());
}
diagram.getFragmentManager().clearLabels();
return true;
}
Pair<Lifeline, Integer> eventAssoc = diagram.getDataProvider().getEventAssociation();
if (eventAssoc != null) {
associateEvent(eventAssoc.getFirst(), eventAssoc.getSecond());
return true;
}
return false;
}
