SVirtualControlJoystick.h

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// Copyright Lost in Game Studio, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "SVirtualControl.h"

class TOUCHINTERFACE_API SVirtualControlJoystick : public SVirtualControl
{
public:
    SLATE_BEGIN_ARGS(SVirtualControlJoystick)
    : _TouchInterface(nullptr)
    , _VirtualInput(nullptr)
    , _Slot(nullptr)
    , _AutoPositioning(true)
    , _UseInputAction(false)
    , _ParentOffset(ForceInitToZero)
    {}
 
    SLATE_ARGUMENT(TSharedPtr<SDeprecatedTouchInterface>, TouchInterface)
    SLATE_ARGUMENT(FVirtualControl, VirtualControl)
    SLATE_ARGUMENT(UVirtualInput*, VirtualInput)
    SLATE_ARGUMENT(SConstraintCanvas::FSlot*, Slot)
    SLATE_ARGUMENT(bool, AutoPositioning)
    SLATE_ARGUMENT(bool, UseInputAction)
    SLATE_ARGUMENT(FVector2D, ParentOffset)
    SLATE_ARGUMENT(ULocalPlayer*, LocalPlayer)
    
    SLATE_ATTRIBUTE(float, Opacity)
    SLATE_ATTRIBUTE(float, ScaleFactor)
    SLATE_ATTRIBUTE(bool, DrawDebug)
    
    SLATE_END_ARGS()
 
    SVirtualControlJoystick();
    
    void Construct(const FArguments& InArgs);
 
    //SVirtualControl
    virtual bool OnPress(const FGeometry& MyGeometry, const FPointerEvent& Event) override;
    virtual void OnMove(const FGeometry& MyGeometry, const FPointerEvent& Event) override;
    virtual void OnRelease(const FGeometry& MyGeometry, const FPointerEvent& Event) override;
    virtual void OnTick(const FGeometry& MyGeometry, const float InScaleFactor, const double InCurrentTime, const float InDeltaTime, const bool InForceUpdate, const bool OrientToLandscape) override;
    
    virtual void CalculateCorrectedValues(const FVector2D& Center, const FVector2D Offset, const FGeometry& AllottedGeometry, const float InScaleFactor) override;
    virtual void Recenter(const FVector2D DesiredPosition) override;
    //SVirtualControl
 
    //SWidget
    //virtual void Tick(const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime) override;
    virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
    virtual FVector2D ComputeDesiredSize(float LayoutScaleMultiplier) const override;
    //SWidget

    bool LockThumb();

    bool LockThumbAtDesiredPosition(const FVector2D LockPosition, const bool Clamp = true);

    void UnlockThumb(const bool bRecenter);
 
    FVector2D GetThumbPosition(const bool bNormalized) const;
 
    FVector2D GetThumbOffset() const { return ThumbOffset; }
 
    //TODO: Get Normalized offset
 
    float GetAngleDelta() const { return LastAngleDelta; }
 
    FVector2D GetRawValue(const bool bApplyModifiers = false);
    FVector2D GetLastRawValue() const { return LastNormalizedOffsetScaled; }
 
private:
    //Send one more joystick update in tick for centering thumbstick
    uint8 bSendOneMoreEvent:1;
    uint8 bThumbIsLocked:1;
    
    float LastAngleDelta;
 
    FVector2D LockedPosition;
    FVector2D LastNormalizedOffset;
    FVector2D LastNormalizedOffsetScaled;
    FVector2D CorrectedThumbSize;
 
    // Thumb position clamped to visual size
    FVector2D ThumbPosition;
 
    // Thumb position (not clamped)
    FVector2D ThumbOffset;
};