JoystickLogic.h

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// Copyright 2024 Lost in Game Studio. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "ComponentLogic.h"
#include "JoystickLogic.generated.h"
 
class UComponentDecorator;
 
//Base class for joystick logic
UCLASS()
class TOUCHINTERFACE_API UJoystickLogic : public UComponentLogic
{
    GENERATED_BODY()
 
public:
    UJoystickLogic();
 
    //Begin LayoutComponentLogic Implementation
    virtual void Initialize_Implementation() override;
 
protected:
    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 CalculateThumbPosition(const FGeometry& ComponentGeometry, const FPointerEvent& PointerEvent);
 
public:
    virtual void SetInputAction_Implementation(UInputAction* NewInputAction) override;
    
    //End LayoutComponentLogic Implementation
    
    //TODO: Bindable event
    //OnThumbstickValueChanged
 
    //TODO: Slate Space or World Space?
    UFUNCTION(Category="Joystick", BlueprintCallable, BlueprintPure)
    FVector2D GetThumbPosition(const bool bNormalized) const;
 
    UFUNCTION(Category="Joystick", BlueprintCallable, BlueprintPure)
    FVector2D GetThumbOffset() const { return ThumbPosition; }
 
    UFUNCTION(Category="Joystick", BlueprintCallable, BlueprintPure)
    UComponentDecorator* GetThumbstickLayer() const { return ThumbstickLayerRef.Get(); }
 
    //TODO: Get Normalized offset
 
    float GetAngleDelta() const { return LastAngleDelta; }
 
    FVector2D GetRawValue(const bool bApplyModifiers = false);
    FVector2D GetRawValueBasedOnPosition(const FGeometry& ComponentGeometry, const FVector2D InThumbPosition);
    //FVector2D GetLastRawValue() const { return LastNormalizedOffsetScaled; }
 
    UFUNCTION(Category="Joystick", BlueprintCallable)
    void SetThumbstickLayerName(FName LayerName);
    
 
public:
    //TODO: If decorator is deleted, the property should be reset to none
    // Name of decorator that is used as thumbstick
    UPROPERTY(Category="Joystick", EditAnywhere, BlueprintReadOnly, meta=(AllowPrivateAccess="true"), meta=(GetOptions="GetAllDecoratorNames"))
    FName ThumbstickDecoratorName;
    
    // If enabled, the logic set the rotation of decorator instead of position
    UPROPERTY(Category="Joystick", EditAnywhere, BlueprintReadOnly, meta=(AllowPrivateAccess="true"))
    uint8 bDirectionOnly:1;
    
    UPROPERTY(Category="Joystick", EditAnywhere, BlueprintReadOnly, meta=(AllowPrivateAccess="true"), meta=(EditCondition="bDirectionOnly==true", EditConditionHide))
    uint8 bResetDirectionToZero:1;
 
    //TODO: Support legacy input
    
    UPROPERTY(Category="Joystick", EditAnywhere, BlueprintReadOnly, meta=(AllowPrivateAccess="true"))
    TObjectPtr<UInputAction> InputAction;

    UPROPERTY(Category="Joystick", EditAnywhere, BlueprintReadOnly, meta=(AllowPrivateAccess="true"))
    bool bClampThumbstickPosition;
 
protected:
    UPROPERTY(Transient)
    TWeakObjectPtr<UComponentDecorator> ThumbstickLayerRef;
 
    FVector2D RawValue;
 
    // Thumb position (not clamped)
    FVector2D ThumbPosition;
    
    // Thumb position clamped to visual size
    FVector2D ClampedThumbPosition;
    
    float LastAngleDelta;
    
    FVector2D LastNormalizedOffset;
    
    float LastRotation;
};