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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.detectScrollType = detectScrollType;
exports.getNormalizedScrollLeft = getNormalizedScrollLeft;
// Source from https://github.com/alitaheri/normalize-scroll-left
let cachedType;
/**
* Based on the jquery plugin https://github.com/othree/jquery.rtl-scroll-type
*
* Types of scrollLeft, assuming scrollWidth=100 and direction is rtl.
*
* Type | <- Most Left | Most Right -> | Initial
* ---------------- | ------------ | ------------- | -------
* default | 0 | 100 | 100
* negative (spec*) | -100 | 0 | 0
* reverse | 100 | 0 | 0
*
* Edge 85: default
* Safari 14: negative
* Chrome 85: negative
* Firefox 81: negative
* IE11: reverse
*
* spec* https://drafts.csswg.org/cssom-view/#dom-window-scroll
*/
function detectScrollType() {
if (cachedType) {
return cachedType;
}
const dummy = document.createElement('div');
const container = document.createElement('div');
container.style.width = '10px';
container.style.height = '1px';
dummy.appendChild(container);
dummy.dir = 'rtl';
dummy.style.fontSize = '14px';
dummy.style.width = '4px';
dummy.style.height = '1px';
dummy.style.position = 'absolute';
dummy.style.top = '-1000px';
dummy.style.overflow = 'scroll';
document.body.appendChild(dummy);
cachedType = 'reverse';
if (dummy.scrollLeft > 0) {
cachedType = 'default';
} else {
dummy.scrollLeft = 1;
if (dummy.scrollLeft === 0) {
cachedType = 'negative';
}
}
document.body.removeChild(dummy);
return cachedType;
}
// Based on https://stackoverflow.com/a/24394376
function getNormalizedScrollLeft(element, direction) {
const scrollLeft = element.scrollLeft;
// Perform the calculations only when direction is rtl to avoid messing up the ltr behavior
if (direction !== 'rtl') {
return scrollLeft;
}
const type = detectScrollType();
switch (type) {
case 'negative':
return element.scrollWidth - element.clientWidth + scrollLeft;
case 'reverse':
return element.scrollWidth - element.clientWidth - scrollLeft;
default:
return scrollLeft;
}
}