function scrollActions()

in static/js/scroll-apiref.js [45:105]
46 lines of code
9 McCabe index (conditional complexity)

    function scrollActions(scrollPosition) {
        var activeSection = checkNodePositions(toc, tocFlat, scrollPosition);
        var activeSubSection,
            prevL1Nav,
            currL1Nav,
            prevL2Nav,
            currL2Nav;

        // No active section - return existing activeTokensObj (may be empty)
        if (!activeSection) {
            return activeTokensObj;
        }

        /**
         * This block deals with L1Nav sections
         */

        // If no previous token, set previous to current active and show L1Nav
        if (!prevSectionToken) {
            prevSectionToken = activeSection.token;
            currL1Nav = getNavNode(activeSection.token);
            currL1Nav.show('fast');
        } 
        // If active is not the same as previous, hide previous L1Nav and show current L1Nav; set previous to current
        else if (activeSection.token !== prevSectionToken) {
            prevL1Nav = getNavNode(prevSectionToken);
            currL1Nav = getNavNode(activeSection.token);
            prevL1Nav.hide('fast');
            currL1Nav.show('fast');
            prevSectionToken = activeSection.token;
        }

        /**
         * This block deals with L2Nav subsections
         */

        // If there is a subsections array and it has a non-zero length, set active subsection
        if (activeSection.subsections && activeSection.subsections.length !== 0) {
            activeSubSection = checkNodePositions(activeSection.subsections, tocFlat, scrollPosition);
            if (activeSubSection) {
                if (!prevSubsectionToken) {
                    prevSubsectionToken = activeSubSection.token;
                    currL2Nav = getNavNode(activeSubSection.token);
                    currL2Nav.show('fast');
                } else if (activeSubSection.token !== prevSubsectionToken) {
                    prevL2Nav = getNavNode(prevSubsectionToken);
                    currL2Nav = getNavNode(activeSubSection.token);
                    prevL2Nav.hide('fast');
                    currL2Nav.show('fast');
                    prevSubsectionToken = activeSubSection.token;
                }
            } else {
                prevL2Nav = getNavNode(prevSubsectionToken);
                prevL2Nav.hide('fast');
                prevSubsectionToken = null;
            }
        }
        activeTokensObj.L1 = prevSectionToken;
        activeTokensObj.L2 = prevSubsectionToken;
        return activeTokensObj;
    }