jobiqo-cl/lib/node_modules/react-remove-scroll/dist/es2015/handleScroll.js

[](https://circleci.com/gh/jobiqo/jobiqo-cl)

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var elementCouldBeVScrolled = function (node) {
    var styles = window.getComputedStyle(node);
    return (styles.overflowY !== 'hidden' && // not-not-scrollable
        !(styles.overflowY === styles.overflowX && styles.overflowY === 'visible') // scrollable
    );
};
var elementCouldBeHScrolled = function (node) {
    var styles = window.getComputedStyle(node);
    return (styles.overflowX !== 'hidden' && // not-not-scrollable
        !(styles.overflowY === styles.overflowX && styles.overflowX === 'visible') // scrollable
    );
};
var locationCouldBeScrolled = function (axis, node) {
    var current = node;
    do {
        var isScrollable = elementCouldBeScrolled(axis, current);
        if (isScrollable) {
            var _a = getScrollVariables(axis, current), s = _a[1], d = _a[2];
            if (s > d) {
                return true;
            }
        }
        current = current.parentNode;
    } while (current && current !== document.body);
    return false;
};
var getVScrollVariables = function (_a) {
    var scrollTop = _a.scrollTop, scrollHeight = _a.scrollHeight, clientHeight = _a.clientHeight;
    return [scrollTop, scrollHeight, clientHeight];
};
var getHScrollVariables = function (_a) {
    var scrollLeft = _a.scrollLeft, scrollWidth = _a.scrollWidth, clientWidth = _a.clientWidth;
    return [scrollLeft, scrollWidth, clientWidth];
};
var elementCouldBeScrolled = function (axis, node) {
    return axis === 'v' ? elementCouldBeVScrolled(node) : elementCouldBeHScrolled(node);
};
var getScrollVariables = function (axis, node) {
    return axis === 'v' ? getVScrollVariables(node) : getHScrollVariables(node);
};
var handleScroll = function (axis, endTarget, event, sourceDelta, noOverscroll) {
    var delta = sourceDelta;
    // find scrollable target
    var target = event.target;
    var targetInLock = endTarget.contains(target);
    var shouldCancelScroll = false;
    var isDeltaPositive = delta > 0;
    var availableScroll = 0;
    var availableScrollTop = 0;
    do {
        var _a = getScrollVariables(axis, target), position = _a[0], scroll_1 = _a[1], capacity = _a[2];
        var elementScroll = scroll_1 - capacity - position;
        if (position || elementScroll) {
            if (elementCouldBeScrolled(axis, target)) {
                availableScroll += elementScroll;
                availableScrollTop += position;
            }
        }
        target = target.parentNode;
    } while (
    // portaled content
    (!targetInLock && target !== document.body) ||
        // self content
        (targetInLock && (endTarget.contains(target) || endTarget === target)));
    if (isDeltaPositive &&
        ((noOverscroll && availableScroll === 0) ||
            (!noOverscroll && delta > availableScroll))) {
        shouldCancelScroll = true;
    }
    else if (!isDeltaPositive &&
        ((noOverscroll && availableScrollTop === 0) ||
            (!noOverscroll && -delta > availableScrollTop))) {
        shouldCancelScroll = true;
    }
    return shouldCancelScroll;
};

exports.handleScroll = handleScroll;
exports.locationCouldBeScrolled = locationCouldBeScrolled;