Function trapBubbledEvent

code/composition/public/app.js:6023–6032

* Traps top-level events by using event bubbling. * * @param {string} topLevelType Record from `BrowserEventConstants`. * @param {string} handlerBaseName Event name (e.g. "click"). * @param {object} element Element on which to attach listener. * @return {?object} An object with a remove functio

(topLevelType, handlerBaseName, element)

 * @internal
 */
function trapBubbledEvent(topLevelType, handlerBaseName, element) {
  if (!element) {
    return null;
  }
  var dispatch = isInteractiveTopLevelEventType(topLevelType) ? dispatchInteractiveEvent : dispatchEvent;

  addEventBubbleListener(element, handlerBaseName,
  // Check if interactive and wrap in interactiveUpdates
  dispatch.bind(null, topLevelType));
}

/**
 * Traps a top-level event by using event capturing.