SliderLogic.h

Go to the documentation of this file.

// Copyright 2025 Lost in Game Studio. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "ComponentLogic.h"
#include "SliderLogic.generated.h"
 
class UComponentDecorator;
 
UENUM()
enum class ESliderType : uint8
{
    Horizontal,
    Vertical,
    Circle
};

UCLASS()
class TOUCHINTERFACE_API USliderLogic : public UComponentLogic
{
    GENERATED_BODY()
 
public:
    USliderLogic();
 
    virtual void Initialize_Implementation() override;
 
    virtual void OnPress_Implementation(const FGeometry& ComponentGeometry, const FPointerEvent& PointerEvent) override;
    virtual void OnMove_Implementation(const FGeometry& ComponentGeometry, const FPointerEvent& PointerEvent) override;
    virtual void OnRelease_Implementation(const FGeometry& ComponentGeometry, const FPointerEvent& PointerEvent) override;
 
    virtual void SetInputAction_Implementation(UInputAction* NewInputAction) override;
 
    //TODO: Make properties private (with allowPrivateAccess) and add getters and setters exposed to blueprint
 
#if WITH_EDITOR
    virtual void PostEditChangeProperty(struct FPropertyChangedEvent& PropertyChangedEvent) override;
#endif
 
private:
    FVector2D CalculateHandleOffset(const float InValue) const;
 
    void CalculateCircularHandleDirectionAndAlignment(const float InValue, FVector2D& Direction, FVector2D& Alignment) const;
 
    FVector2D CalculateHandleOffsetFromLocation(const FVector2D Location);
 
    void CalculateCircularHandleDirectionAndAlignmentFromLocation(const FVector2D Location, FVector2D& Direction, FVector2D& Alignment) const;
 
    float CalculateInputValue(const FVector2D Location) const;
 
    bool CanSendInput(const FVector2D Location) const;
 
public:
    //Slider the slider type
    UPROPERTY(Category="Slider", EditAnywhere, BlueprintReadWrite)
    ESliderType Type;
 
    
    // Name of decorator layer that is moved
    UPROPERTY(Category="Slider|Appearance", EditAnywhere, BlueprintReadOnly, meta=(GetOptions="GetAllDecoratorNames"))
    FName HandleDecoratorName;

    UPROPERTY(Category="Slider|Appearance", EditAnywhere, BlueprintReadWrite)
    uint8 bInvert:1;
    
    //Start angle (-180 to 180). Used only with circle type slider
    UPROPERTY(Category="Slider|Appearance", EditAnywhere, BlueprintReadWrite, meta=(EditCondition="Type==ESliderType::Circle", EditConditionHides))
    float StartAngle;
 
    //End angle (-180 to 180). Used only with circle type slider
    UPROPERTY(Category="Slider|Appearance", EditAnywhere, BlueprintReadWrite, meta=(EditCondition="Type==ESliderType::Circle", EditConditionHides))
    float EndAngle;
 
    //If enabled, set handle rotation to circle rotation based on value. Otherwise, the handle keep same rotation
    UPROPERTY(Category="Slider|Appearance", EditAnywhere, BlueprintReadWrite, meta=(EditCondition="Type==ESliderType::Circle", EditConditionHides))
    uint8 bAlignRotation:1;
    
    
    UPROPERTY(Category="Slider|Input", EditAnywhere, BlueprintReadWrite)
    TObjectPtr<UInputAction> InputAction;
 
    //Minimum value of slider
    UPROPERTY(Category="Slider|Input", EditAnywhere, BlueprintReadWrite)
    float MinValue;
    
    //Maximum value of slider
    UPROPERTY(Category="Slider|Input", EditAnywhere, BlueprintReadWrite)
    float MaxValue;
    
    //Current value of slider (0 to 1)
    UPROPERTY(Category="Slider|Input", EditAnywhere, BlueprintReadWrite, meta=(ClampMin=0.0f, ClampMax=1.0f))
    float Value;
 
    //If enabled, inject input each frame otherwise, inject only when value change.
    UPROPERTY(Category="Slider|Input", EditAnywhere, BlueprintReadWrite)
    uint8 bSendContinuousInput:1;
    
    //TODO: Inject continuously even on release. Should be stopped manually
    
 
    //The slider handle back to center when interaction ended
    UPROPERTY(Category="Slider|Advanced", EditAnywhere, BlueprintReadWrite)
    uint8 bBackToCenter:1;
    
    //If enabled, the center of handle can be moved to reach the edge of component
    UPROPERTY(Category="Slider|Advanced", EditAnywhere, BlueprintReadWrite)
    uint8 bHandleCenterToEdge:1;
 
protected:
    UPROPERTY()
    TWeakObjectPtr<UComponentDecorator> HandleDecoratorRef;
 
private:
    FVector2D OriginalDecoratorBrushOffset;
};