SSubMenuHandler.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SCompoundWidget.h"
#include "Widgets/Layout/SMenuOwner.h"
 
class FActiveTimerHandle;
 
class SSubMenuHandler : public SCompoundWidget
{
public:
    SLATE_BEGIN_ARGS( SSubMenuHandler )
        : _Placement( EMenuPlacement::MenuPlacement_MenuRight )
    {}
        SLATE_DEFAULT_SLOT( FArguments, Content )
        SLATE_ARGUMENT( TSharedPtr<SMenuAnchor>, MenuAnchor )
        SLATE_ARGUMENT( TSharedPtr<SWidget>, MenuContent )
        SLATE_ATTRIBUTE( EMenuPlacement, Placement )
        SLATE_EVENT( FOnGetContent, OnGetMenuContent )
    SLATE_END_ARGS()
 
    SLATE_API void Construct(const FArguments& InArgs, TWeakPtr<SMenuOwner> InMenuOwner);
 
public:
    // SWidget interface
    SLATE_API virtual void OnMouseEnter( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent ) override;
    SLATE_API virtual void OnMouseLeave( const FPointerEvent& MouseEvent ) override;
    // End of SWidget interface
    
    SLATE_API bool ShouldSubMenuAppearHovered() const;
 
    SLATE_API void RequestSubMenuToggle( bool bOpenMenu, const bool bClobber, const bool bImmediate = false);
    
    SLATE_API void CancelPendingSubMenu();
 
    bool HasSubMenu() const
    {
        return MenuAnchor.IsValid();
    }
 
    SLATE_API bool IsSubMenuOpen() const;
 
protected:
    SLATE_API EActiveTimerReturnType UpdateSubMenuState(double InCurrentTime, float InDeltaTime, bool bWantsOpen);
 
    TWeakPtr<FActiveTimerHandle> ActiveTimerHandle;
 
    TWeakPtr< SMenuAnchor > MenuAnchor;
 
    TWeakPtr< class SMenuOwner > MenuOwnerWidget;
};