InputBehaviorModifierStates.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "InputState.h"
#include "BehaviorTargetInterfaces.h"
 
class FInputBehaviorModifierStates
{
public:
    typedef TFunction<bool(const FInputDeviceState&)> FModifierTestFunction;
 
protected:
    TArray<int> ModifierIDs;
    TMap<int, FModifierTestFunction> ModifierTests;
 
public:
    
    void RegisterModifier(int ModifierID, const FModifierTestFunction& ModifierTest)
    {
        check(ModifierIDs.Contains(ModifierID) == false);
        ModifierIDs.Add(ModifierID);
        ModifierTests.Add(ModifierID, ModifierTest);
    }
 
 
    bool HasModifiers() const
    {
        return (ModifierIDs.Num() > 0);
    }
 
 
    void UpdateModifiers(const FInputDeviceState& Input, IModifierToggleBehaviorTarget* ModifiersTarget) const
    {
        for (int ModifierID : ModifierIDs)
        {
            bool bIsOn = ModifierTests[ModifierID](Input);
            ModifiersTarget->OnUpdateModifierState(ModifierID, bIsOn);
        }
    }
};