getBoundaries.js
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import getScrollParent from './getScrollParent';
import getParentNode from './getParentNode';
import findCommonOffsetParent from './findCommonOffsetParent';
import getOffsetRectRelativeToArbitraryNode from './getOffsetRectRelativeToArbitraryNode';
import getViewportOffsetRectRelativeToArtbitraryNode from './getViewportOffsetRectRelativeToArtbitraryNode';
import getWindowSizes from './getWindowSizes';
import isFixed from './isFixed';
/**
* Computed the boundaries limits and return them
* @method
* @memberof Popper.Utils
* @param {HTMLElement} popper
* @param {HTMLElement} reference
* @param {number} padding
* @param {HTMLElement} boundariesElement - Element used to define the boundaries
* @returns {Object} Coordinates of the boundaries
*/
export default function getBoundaries(
popper,
reference,
padding,
boundariesElement
) {
// NOTE: 1 DOM access here
let boundaries = { top: 0, left: 0 };
const offsetParent = findCommonOffsetParent(popper, reference);
// Handle viewport case
if (boundariesElement === 'viewport') {
boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);
} else {
// Handle other cases based on DOM element used as boundaries
let boundariesNode;
if (boundariesElement === 'scrollParent') {
boundariesNode = getScrollParent(getParentNode(popper));
if (boundariesNode.nodeName === 'BODY') {
boundariesNode = popper.ownerDocument.documentElement;
}
} else if (boundariesElement === 'window') {
boundariesNode = popper.ownerDocument.documentElement;
} else {
boundariesNode = boundariesElement;
}
const offsets = getOffsetRectRelativeToArbitraryNode(
boundariesNode,
offsetParent
);
// In case of HTML, we need a different computation
if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
const { height, width } = getWindowSizes();
boundaries.top += offsets.top - offsets.marginTop;
boundaries.bottom = height + offsets.top;
boundaries.left += offsets.left - offsets.marginLeft;
boundaries.right = width + offsets.left;
} else {
// for all the other DOM elements, this one is good
boundaries = offsets;
}
}
// Add paddings
boundaries.left += padding;
boundaries.top += padding;
boundaries.right -= padding;
boundaries.bottom -= padding;
return boundaries;
}