Function constructSelectEvent

docs/external/js/react-dom.development.js:9773–9797

* Poll selection to see whether it's changed. * * @param {object} nativeEvent * @param {object} nativeEventTarget * @return {?SyntheticEvent}

(nativeEvent, nativeEventTarget)

  function constructSelectEvent(nativeEvent, nativeEventTarget) {
    // Ensure we have the right element, and that the user is not dragging a
    // selection (this matches native `select` event behavior). In HTML5, select
    // fires only on input and textarea thus if there's no focused element we
    // won't dispatch.
    var doc = getEventTargetDocument(nativeEventTarget);

    if (mouseDown || activeElement$1 == null || activeElement$1 !== getActiveElement(doc)) {
      return null;
    } // Only fire when selection has actually changed.


    var currentSelection = getSelection$1(activeElement$1);

    if (!lastSelection || !shallowEqual(lastSelection, currentSelection)) {
      lastSelection = currentSelection;
      var syntheticEvent = SyntheticEvent.getPooled(eventTypes$3.select, activeElementInst$1, nativeEvent, nativeEventTarget);
      syntheticEvent.type = 'select';
      syntheticEvent.target = activeElement$1;
      accumulateTwoPhaseDispatches(syntheticEvent);
      return syntheticEvent;
    }

    return null;
  }
  /**
   * This plugin creates an `onSelect` event that normalizes select events
   * across form elements.