@gechiui/dom/build-module/dom/caret-range-from-point.js

DOM utilities module for GeChiUI.

/**
 * Polyfill.
 * Get a collapsed range for a given point.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/Document/caretRangeFromPoint
 *
 * @param {DocumentMaybeWithCaretPositionFromPoint} doc The document of the range.
 * @param {number}                                  x   Horizontal position within the current viewport.
 * @param {number}                                  y   Vertical position within the current viewport.
 *
 * @return {Range | null} The best range for the given point.
 */
export default function caretRangeFromPoint(doc, x, y) {
  if (doc.caretRangeFromPoint) {
    return doc.caretRangeFromPoint(x, y);
  }

  if (!doc.caretPositionFromPoint) {
    return null;
  }

  const point = doc.caretPositionFromPoint(x, y); // If x or y are negative, outside viewport, or there is no text entry node.
  // https://developer.mozilla.org/en-US/docs/Web/API/Document/caretRangeFromPoint

  if (!point) {
    return null;
  }

  const range = doc.createRange();
  range.setStart(point.offsetNode, point.offset);
  range.collapse(true);
  return range;
}
/**
 * @typedef {{caretPositionFromPoint?: (x: number, y: number)=> CaretPosition | null} & Document } DocumentMaybeWithCaretPositionFromPoint
 * @typedef {{ readonly offset: number; readonly offsetNode: Node; getClientRect(): DOMRect | null; }} CaretPosition
 */
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