Function getPageBar

Pagetual/pagetual.user.js:11534–11565

()

    }

    function getPageBar() {
        let preBar = null, nextBar = null;
        let pageBars = [].slice.call(document.querySelectorAll(".pagetual_pageBar"));
        for (let i = 0; i < pageBars.length; i++) {
            let pageBar = pageBars[i];
            if (!pageBar || !getBody(document).contains(pageBar)) continue;
            let {
                top,
                right,
                bottom,
                left
            } = pageBar.getBoundingClientRect();
            if (top > 500) {
                nextBar = pageBar;
                preBar = (i - 1 >= 0 ? pageBars[i - 1] : null);
                if (pageBar && getBody(document).contains(pageBar)) {
                    let {
                        top,
                        right,
                        bottom,
                        left
                    } = pageBar.getBoundingClientRect();
                    if (top < -500) {
                        preBar = pageBar;
                    } else preBar = (i - 2 >= 0 ? pageBars[i - 2] : null);
                }
                break;
            }
        }
        if (!nextBar) preBar = pageBars[pageBars.length - 2];
        return {preBar: preBar, nextBar: nextBar};
    }

    var urlChanged = false;
    var urlChanging = false;