subscribe method
Implementation
void subscribe(int index, LifecycleAware lifecycleAware) {
if (_lifecycleSubscribers[index] != lifecycleAware) {
_lifecycleSubscribers[index] = lifecycleAware;
// Dispatch [LifecycleEvent.active] to initial page.
if (_curPage == index) {
if (ModalRoute.of(context)!.isCurrent) {
dispatchEvents(lifecycleEventsVisibleAndActive);
} else {
dispatchEvents([LifecycleEvent.visible]);
}
}
}
}