/// <summary>
/// Subscribe to the given event on the given target object
/// </summary>
/// <param name="targetEvent"></param>
/// <param name="target"></param>
public void Subscribe(FieldInfo targetKlaxEvent, object target)
{
// Unsubscribe in case we are subscribed to another event currently
Unsubscribe();
if (TargetComponentGuid != Guid.Empty && target is CEntity baseEntity)
{
CEntityComponent targetComponent = baseEntity.GetComponentByGuid(TargetComponentGuid);
if (targetComponent == null)
{
throw new Exception("Event graphs tried to bind to a component event of a component that does not exist on the parent entity");
}
target = targetComponent;
}
//Validate that the event handler has the correct form
CKlaxScriptEventBase klaxEvent = (CKlaxScriptEventBase)TargetEvent.klaxEventInfo.GetValue(target);
if (klaxEvent == null)
{
throw new NullReferenceException("The given event has an invalid handler");
}
klaxEvent.Subscribe(Execute);
m_eventSource = target;
m_bIsSubscribed = true;
}
/// <summary>
/// Unsubscribes this graph if it is currently subscribed to an event
/// </summary>
public void Unsubscribe()
{
if (m_bIsSubscribed)
{
CKlaxScriptEventBase klaxEvent = (CKlaxScriptEventBase)TargetEvent.klaxEventInfo.GetValue(m_eventSource);
klaxEvent.Unsubscribe(Execute);
m_bIsSubscribed = false;
}
}