QuickColorTween.h

// Copyright 2025 Juan Pablo Hernandez Mosti. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "QuickTweenBase.h"
#include "QuickColorTween.generated.h"
 
class UQuickColorTween;
DECLARE_DELEGATE_RetVal_OneParam(FColor, FNativeColorGetter, UQuickColorTween*);
DECLARE_DELEGATE_TwoParams( FNativeColorSetter, const FColor&, UQuickColorTween* );

UCLASS(BlueprintType)
class QUICKTWEEN_API UQuickColorTween : public UQuickTweenBase
{
    GENERATED_BODY()
private:
    UQuickColorTween() = default;

    void SetUp(
        const UObject* worldContextObject,
        FNativeColorGetter from,
        FNativeColorGetter to,
        FNativeColorSetter setter,
        float duration = 1.0f,
        float timeScale = 1.0f,
        EEaseType easeType = EEaseType::Linear,
        UCurveFloat* easeCurve = nullptr,
        int32 loops = 1,
        ELoopType loopType = ELoopType::Restart,
        const FString& tweenTag = FString(),
        bool bShouldAutoKill = true,
        bool bShouldPlayWhilePaused = false,
        bool bShouldAutoPlay = false)
    {
        From = MoveTemp(from);
        To = MoveTemp(to);
        Setter = MoveTemp(setter);
        UQuickTweenBase::SetUp(
            worldContextObject,
            duration,
            timeScale,
            easeType,
            easeCurve,
            loops,
            loopType,
            tweenTag,
            bShouldAutoKill,
            bShouldPlayWhilePaused,
            bShouldAutoPlay);
 
    }
public:

    static UQuickColorTween* CreateTween(
        UObject* worldContextObject,
        FNativeColorGetter from,
        FNativeColorGetter to,
        FNativeColorSetter setter,
        float duration = 1.0f,
        float timeScale = 1.0f,
        EEaseType easeType = EEaseType::Linear,
        UCurveFloat* easeCurve = nullptr,
        int32 loops = 1,
        ELoopType loopType = ELoopType::Restart,
        const FString& tweenTag = FString(),
        bool bShouldAutoKill = true,
        bool bShouldPlayWhilePaused = false,
        bool bShouldAutoPlay = false)
    {
        if (!from.IsBound() || !to.IsBound() || !setter.IsBound())
        {
            UE_LOG(LogQuickTweenBase, Warning, TEXT("UQuickColorTween::CreateTween: One or more delegate functions are not bound."));
            return nullptr;
        }
        
        UQuickColorTween* tween = NewObject<UQuickColorTween>(worldContextObject);
        tween->SetUp(
            worldContextObject,
            MoveTemp(from),
            MoveTemp(to),
            MoveTemp(setter),
            duration,
            timeScale,
            easeType,
            easeCurve,
            loops,
            loopType,
            tweenTag,
            bShouldAutoKill,
            bShouldPlayWhilePaused,
            bShouldAutoPlay);
        return tween;
    }

    UFUNCTION(BlueprintPure, meta = (Keywords = "Tween"), Category = "Tween|Info")
    [[nodiscard]] FColor GetCurrentValue() const { return CurrentValue; }

    UFUNCTION(BlueprintPure, meta = (Keywords = "Tween"), Category = "Tween|Info")
    [[nodiscard]] FColor GetStartValue() const { return StartValue.Get(FColor::White); }

    UFUNCTION(BlueprintPure, meta = (Keywords = "Tween"), Category = "Tween|Info")
    [[nodiscard]] FColor GetEndValue() const { return EndValue.Get(FColor::White); }
protected:
    virtual void ApplyAlphaValue(float alpha) override;
 
    virtual void HandleOnStart() override;
 
    virtual void HandleOnComplete() override;
 
private:
    FNativeColorGetter From;

    FNativeColorGetter To;

    TOptional<FColor> StartValue;

    TOptional<FColor> EndValue;

    FNativeColorSetter Setter;

    FColor CurrentValue;
};