ScrollyZoomy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Input/CursorReply.h"
#include "Input/Reply.h"
#include "Framework/Layout/InertialScrollManager.h"
 
class FSlateWindowElementList;
class SWidget;
 
class IScrollableZoomable
{
public:
 
    virtual bool ScrollBy(const FVector2D& Offset) = 0;
 
    virtual bool ZoomBy(const float Amount) = 0;
};
 
 
class FScrollyZoomy
{
public:
 
    SLATE_API FScrollyZoomy(const bool InUseInertialScrolling = true);
 
    SLATE_API void Tick(const float DeltaTime, IScrollableZoomable& ScrollableZoomable);
 
    SLATE_API FReply OnMouseButtonDown(const FPointerEvent& MouseEvent);
 
    SLATE_API FReply OnMouseButtonUp(const TSharedRef<SWidget> MyWidget, const FGeometry& MyGeometry, const FPointerEvent& MouseEvent);
        
    SLATE_API FReply OnMouseMove(const TSharedRef<SWidget> MyWidget, IScrollableZoomable& ScrollableZoomable, const FGeometry& MyGeometry, const FPointerEvent& MouseEvent);
 
    SLATE_API void OnMouseLeave(const TSharedRef<SWidget> MyWidget, const FPointerEvent& MouseEvent);
        
    SLATE_API FReply OnMouseWheel(const FPointerEvent& MouseEvent, IScrollableZoomable& ScrollableZoomable);
 
    SLATE_API FCursorReply OnCursorQuery() const;
 
    SLATE_API bool IsRightClickScrolling() const;
 
    SLATE_API bool NeedsSoftwareCursor() const;
 
    SLATE_API UE::Slate::FDeprecateVector2DResult GetSoftwareCursorPosition() const;
 
    SLATE_API int32 PaintSoftwareCursorIfNeeded(const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId) const;
 
private:
 
    float AmountScrolledWhileRightMouseDown;
 
    bool bShowSoftwareCursor;
 
    FVector2f SoftwareCursorPosition;
 
    bool UseInertialScrolling;
 
    FInertialScrollManager HorizontalIntertia;
 
    FInertialScrollManager VerticalIntertia;
};