73 lines
2.9 KiB
JavaScript
73 lines
2.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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Object.defineProperty(exports, "scrollIntoView", {
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enumerable: true,
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get: function() {
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return scrollIntoView;
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}
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});
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const scrollIntoView = (target)=>{
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if (!target) {
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return;
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}
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const scrollParent = findScrollableParent(target.parentElement);
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if (!scrollParent) {
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return;
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}
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const { offsetHeight } = target;
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const offsetTop = getTotalOffsetTop(target, scrollParent);
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const { scrollMarginTop, scrollMarginBottom } = getScrollMargins(target);
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const { offsetHeight: parentOffsetHeight, scrollTop } = scrollParent;
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const isAbove = offsetTop - scrollMarginTop < scrollTop;
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const isBelow = offsetTop + offsetHeight + scrollMarginBottom > scrollTop + parentOffsetHeight;
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const buffer = 2;
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if (isAbove) {
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scrollParent.scrollTo(0, offsetTop - scrollMarginTop - buffer);
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} else if (isBelow) {
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scrollParent.scrollTo(0, offsetTop + offsetHeight + scrollMarginBottom - parentOffsetHeight + buffer);
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}
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};
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const findScrollableParent = (element)=>{
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if (!element) {
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return null;
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}
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if (element.scrollHeight > element.offsetHeight) {
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return element;
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}
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return findScrollableParent(element.parentElement);
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};
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const getTotalOffsetTop = (element, scrollParent)=>{
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if (!element || element === scrollParent) {
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return 0;
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}
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if (element.contains(scrollParent)) {
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// subtract the scroll parent's offset top from the running total if the offsetParent is above it
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return scrollParent.offsetTop * -1;
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}
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return element.offsetTop + getTotalOffsetTop(element.offsetParent, scrollParent);
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};
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const getScrollMargins = (element)=>{
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var _element_ownerDocument;
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const win = (_element_ownerDocument = element.ownerDocument) === null || _element_ownerDocument === void 0 ? void 0 : _element_ownerDocument.defaultView;
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if (!win) {
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return {
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scrollMarginTop: 0,
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scrollMarginBottom: 0
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};
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}
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const computedStyles = win.getComputedStyle(element);
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var _getIntValueOfComputedStyle;
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const scrollMarginTop = (_getIntValueOfComputedStyle = getIntValueOfComputedStyle(computedStyles.scrollMarginTop)) !== null && _getIntValueOfComputedStyle !== void 0 ? _getIntValueOfComputedStyle : getIntValueOfComputedStyle(computedStyles.scrollMarginBlockStart);
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var _getIntValueOfComputedStyle1;
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const scrollMarginBottom = (_getIntValueOfComputedStyle1 = getIntValueOfComputedStyle(computedStyles.scrollMarginBottom)) !== null && _getIntValueOfComputedStyle1 !== void 0 ? _getIntValueOfComputedStyle1 : getIntValueOfComputedStyle(computedStyles.scrollMarginBlockEnd);
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return {
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scrollMarginTop,
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scrollMarginBottom
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};
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};
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const getIntValueOfComputedStyle = (computedStyle)=>{
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return computedStyle ? parseInt(computedStyle, 10) : 0;
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};
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