This question is build on top of a previously asked question: MVP Communication between presenters?
I am implementing the pattern outlined in the previous post. However I've run into an issue when trying to retrieve state from Presenter B based on some event in Presenter A.
For example, Presenter A responds to a view event, SaveButtonClicked.
Presenter A needs to get some state from Presenter B's view, View B.
So far what I've tried is:
class PresenterA
{
void PresenterA()
{
EventHub.Register(EventType.SendStateToPresenterA, HandleSendStateToPresenterA);
}
void HandleSaveClick(int productId)
{
EventHub.Publish(EventType.GetStateFromPresenterB, productId);
}
void HandleSendStateToPresenterA(string state)
{
// save to db
}
}
class PresenterB
{
void PresenterB
{
EventHub.Register(EventType.GetStateFromPresenterB, HandleGetStateFromPresenterB);
}
public void HandleProductChanged(int state)
{
EventHub.Publish(EventType.SendStateToPresenterA, "I am state!");
}
}
The problem with this approach is that it is overly complex if I have more than 2 presenters.
What are some ways to handle this?
