Return a Value from a SubState

Ferrari177

I am passing in a value as "trigger" to a substate, that works fine. My problem is I am setting a Bool flag in the substate that I want to pass back to the parent, but it dont know how to return it.
I tried setting up a Global state that I import, but that didn't seem to work. Help!

Thanks Lee

	var tempState:StoryState = new StoryState();
	tempState.isPersistant = true;
	tempState.trigger = trigger;  // pass trigger number into substate.
	openSubState(tempState);

I just close it when I return

close();
return ;

HappinessSam

Quite a few different ways you could add a public FlxSignal to StoryState and have a function in your parent state subscribe to it, then dispatch it before you call close().

So for example StoryState would have in the declarations
public var triggerSignal:FlxTypedSignal<Bool->Void>
in it's constructor
triggerSignal = new FlxTypedSignal<Bool->Void>()
and when its closes itself it dispatches it

triggerSignal.dispatch(trigger);
close();
return ;

Your main state would have a function to receive the dispatch

function substateTriggerHandler(trigger:Bool):Void
{
}

Which it would add to the signal when it creates the state

var tempState:StoryState = new StoryState();
tempState.triggerSignal.add(substateTriggerHandler);

If you care about encapulation you could pass substateTriggerHandler to as a parameter to StoryState, I guess.

Ferrari177

Thanks I will try to get this working. Seems overly complex for returning a value. Shame there is not easy way of creating a variable that is truly global. I tried have a gloabal state but when you import it into antoher state then the value goes back to null. Lee

HappinessSam

@Ferrari177 If you just want a global value you could use a static variable in StoryState, eg
public static var trigger:Bool;
A static value is one that is a property of the class rather than an instance of the class, so you can access it anywhere as
StoryState.trigger

Extra

And of course you can simply run any state method from substate on substate's closing:

(cast _parentState).AnyMethod(); 
close();
return ;

Note: Cast disables the check for the existence of such a method in a class at compile time and at runtime, it means that the correctness of the method name and parameters - at your own risk.

Ferrari177

AHH yes! thats what I needed. Thanks. Got the data going back, Thanks again.