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position.js
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Sat, Dec 14, 02:28

position.js
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import _extends from "@babel/runtime/helpers/esm/extends";
import css from './css';
import getOffset from './offset';
import getOffsetParent from './offsetParent';
import scrollLeft from './scrollLeft';
import scrollTop from './scrollTop';
var nodeName = function nodeName(node) {
return node.nodeName && node.nodeName.toLowerCase();
};
/**
* Returns the relative position of a given element.
*
* @param node the element
* @param offsetParent the offset parent
*/
export default function position(node, offsetParent) {
var parentOffset = {
top: 0,
left: 0
};
var offset; // Fixed elements are offset from window (parentOffset = {top:0, left: 0},
// because it is its only offset parent
if (css(node, 'position') === 'fixed') {
offset = node.getBoundingClientRect();
} else {
var parent = offsetParent || getOffsetParent(node);
offset = getOffset(node);
if (nodeName(parent) !== 'html') parentOffset = getOffset(parent);
var borderTop = String(css(parent, 'borderTopWidth') || 0);
parentOffset.top += parseInt(borderTop, 10) - scrollTop(parent) || 0;
var borderLeft = String(css(parent, 'borderLeftWidth') || 0);
parentOffset.left += parseInt(borderLeft, 10) - scrollLeft(parent) || 0;
}
var marginTop = String(css(node, 'marginTop') || 0);
var marginLeft = String(css(node, 'marginLeft') || 0); // Subtract parent offsets and node margins
return _extends({}, offset, {
top: offset.top - parentOffset.top - (parseInt(marginTop, 10) || 0),
left: offset.left - parentOffset.left - (parseInt(marginLeft, 10) || 0)
});
}

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