Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a
Name Type Description
module:ol/events/Event~BaseEvent | string
falseif anyone called preventDefault on the event object or if any of the listeners returned false.
Load the image or retry if loading previously failed. Loading is taken care of by the tile queue, and calling this method is only needed for preloading or for reloading in case of an error.