public int setCurrentPageNext() {
        int increment = 0;
        if (documentViewModel != null) {
            increment = documentView.getNextPageIncrement();
            int current = documentViewModel.getViewCurrentPageIndex();
            if ((current + increment) < document.getNumberOfPages()) {
                documentViewModel.setViewCurrentPageIndex(current + increment);
            } else {
                documentViewModel.setViewCurrentPageIndex(document.getNumberOfPages() - 1);
            }
        }
        return increment;
    }