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import getScrollParent from './getScrollParent';
import getWindow from './getWindow';
function attachToScrollParents(scrollParent, event, callback, scrollParents) {
const isBody = scrollParent.nodeName === 'BODY';
const target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
target.addEventListener(event, callback, { passive: true });
if (!isBody) {
attachToScrollParents(
getScrollParent(target.parentNode),
event,
callback,
scrollParents
);
}
scrollParents.push(target);
}
/**
* Setup needed event listeners used to update the popper position
* @method
* @memberof Popper.Utils
* @private
*/
export default function setupEventListeners(
reference,
options,
state,
updateBound
) {
// Resize event listener on window
state.updateBound = updateBound;
getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
// Scroll event listener on scroll parents
const scrollElement = getScrollParent(reference);
attachToScrollParents(
scrollElement,
'scroll',
state.updateBound,
state.scrollParents
);
state.scrollElement = scrollElement;
state.eventsEnabled = true;
return state;
}