reportStoryOpened method
A story was opened (ring/thumbnail tapped) — drives open rate and forwards
every opening to the CEP. itemIndex is the 1-based item opened.
Implementation
void reportStoryOpened(CEPTriggerPayload payload, {required int itemIndex}) {
_events.toBoth(
ExperienceClicked(elementId: 'story_item_$itemIndex'),
const StoriesOpened(),
payload,
);
}