start method
Returns true if the guide was started, false if preconditions fail or one is already showing.
Implementation
bool start(CampaignModel campaign, CEPTriggerPayload payload) {
final config = campaign.config;
if (campaign.campaignType != 'guide' || config is! GuideCampaignConfig) {
return false;
}
if (config.guideConfig.stepCount == 0) return false;
if (_state != null) return false;
_state = ActiveGuideState(
campaign: campaign,
payload: payload,
token: ++_tokenCounter,
);
notifyListeners();
return true;
}