Function preventFocus

packages/react-aria/src/interactions/utils.ts:121–190

(target: FocusableElement | null)

 * using a capturing listener on the window and stopping propagation.
 */
export function preventFocus(target: FocusableElement | null): (() => void) | undefined {
  // The browser will focus the nearest focusable ancestor of our target.
  while (target && !isFocusable(target, {skipVisibilityCheck: true})) {
    target = target.parentElement;
  }

  let window = getOwnerWindow(target);
  let activeElement = window.document.activeElement as FocusableElement | null;
  if (!activeElement || activeElement === target) {
    return;
  }

  ignoreFocusEvent = true;
  let isRefocusing = false;
  let onBlur = (e: FocusEvent) => {
    if (getEventTarget(e) === activeElement || isRefocusing) {
      e.stopImmediatePropagation();
    }
  };

  let onFocusOut = (e: FocusEvent) => {
    if (getEventTarget(e) === activeElement || isRefocusing) {
      e.stopImmediatePropagation();

      // If there was no focusable ancestor, we don't expect a focus event.
      // Re-focus the original active element here.
      if (!target && !isRefocusing) {
        isRefocusing = true;
        focusWithoutScrolling(activeElement);
        cleanup();
      }
    }
  };

  let onFocus = (e: FocusEvent) => {
    if (getEventTarget(e) === target || isRefocusing) {
      e.stopImmediatePropagation();
    }
  };

  let onFocusIn = (e: FocusEvent) => {
    if (getEventTarget(e) === target || isRefocusing) {
      e.stopImmediatePropagation();

      if (!isRefocusing) {
        isRefocusing = true;
        focusWithoutScrolling(activeElement);
        cleanup();
      }
    }
  };

  window.addEventListener('blur', onBlur, true);
  window.addEventListener('focusout', onFocusOut, true);
  window.addEventListener('focusin', onFocusIn, true);
  window.addEventListener('focus', onFocus, true);

  let cleanup = () => {