private async Task OnHandlingStepEvent(ScreenEvent triggeredEvent, IUiFlowContextData contextData)
{
if (_eventHandlers.ContainsKey(triggeredEvent))
{
var eventHandler = _eventHandlers[triggeredEvent];
await eventHandler(triggeredEvent, contextData);
}
}
public bool ValidateTransitionAttempt(ScreenEvent triggeredEvent,
IUiFlowContextData contextData, out string errorMessage)
{
TraceBegin(nameof(HandleStepEvent), contextData, triggeredEvent);
LifecycleStage = ScreenLifecycleStage.ValidatingTransition;
var isValid = OnValidate(triggeredEvent, contextData, out errorMessage);
LifecycleStage = isValid
? ScreenLifecycleStage.ValidateTransitionCompleted
: ScreenLifecycleStage.ValidateTransitionCompletedWithErrors;
TraceEnd(nameof(HandleStepEvent), contextData, triggeredEvent);
return(isValid);
}
public async Task HandleStepEvent(ScreenEvent triggeredEvent, IUiFlowContextData contextData)
{
TraceBegin(nameof(HandleStepEvent), contextData, triggeredEvent);
LifecycleStage = ScreenLifecycleStage.HandlingEvent;
//TDO: inline next
await OnHandlingStepEvent(triggeredEvent, contextData);
var uiFlowStepData = contextData.GetCurrentStepData <UiFlowScreenModel>();
if (uiFlowStepData != null)
{
uiFlowStepData.Errors = new List <UiFlowUserInputError>();
}
LifecycleStage = ScreenLifecycleStage.HandleEventCompleted;
TraceEnd(nameof(HandleStepEvent), contextData, triggeredEvent);
}
protected virtual bool OnValidate(ScreenEvent triggeredEvent,
IUiFlowContextData contextData, out string errorMessage)
{
errorMessage = null;
return(true);
}
public virtual bool MustExecuteAnotherTransition(out ScreenEvent screenEvent)
{
screenEvent = null;
return(false);
}
