"use strict";
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exports.__esModule = true;
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exports.getScroller = getScroller;
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exports.getScrollTop = getScrollTop;
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exports.setScrollTop = setScrollTop;
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exports.getRootScrollTop = getRootScrollTop;
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exports.setRootScrollTop = setRootScrollTop;
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exports.getElementTop = getElementTop;
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exports.getVisibleHeight = getVisibleHeight;
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exports.getVisibleTop = getVisibleTop;
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function isWindow(val) {
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return val === window;
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} // get nearest scroll element
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// https://github.com/vant-ui/vant/issues/3823
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var overflowScrollReg = /scroll|auto|overlay/i;
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function getScroller(el, root) {
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if (root === void 0) {
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root = window;
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}
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var node = el;
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while (node && node.tagName !== 'HTML' && node.tagName !== 'BODY' && node.nodeType === 1 && node !== root) {
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var _window$getComputedSt = window.getComputedStyle(node),
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overflowY = _window$getComputedSt.overflowY;
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if (overflowScrollReg.test(overflowY)) {
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return node;
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}
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node = node.parentNode;
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}
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return root;
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}
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function getScrollTop(el) {
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var top = 'scrollTop' in el ? el.scrollTop : el.pageYOffset; // iOS scroll bounce cause minus scrollTop
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return Math.max(top, 0);
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}
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function setScrollTop(el, value) {
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if ('scrollTop' in el) {
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el.scrollTop = value;
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} else {
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el.scrollTo(el.scrollX, value);
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}
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}
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function getRootScrollTop() {
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return window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
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}
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function setRootScrollTop(value) {
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setScrollTop(window, value);
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setScrollTop(document.body, value);
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} // get distance from element top to page top or scroller top
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function getElementTop(el, scroller) {
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if (isWindow(el)) {
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return 0;
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}
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var scrollTop = scroller ? getScrollTop(scroller) : getRootScrollTop();
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return el.getBoundingClientRect().top + scrollTop;
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}
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function getVisibleHeight(el) {
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if (isWindow(el)) {
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return el.innerHeight;
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}
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return el.getBoundingClientRect().height;
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}
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function getVisibleTop(el) {
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if (isWindow(el)) {
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return 0;
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}
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return el.getBoundingClientRect().top;
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}
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