Menu.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Input/PopupMethodReply.h"
#include "Framework/Application/IMenu.h"
 
class SWidget;
class SWindow;
 
class FMenuBase : public IMenu, public TSharedFromThis<FMenuBase>
{
public:
    virtual FOnMenuDismissed& GetOnMenuDismissed() override { return OnMenuDismissed; }
    virtual TSharedPtr<SWidget> GetContent() const override { return Content; }
    bool IsCollapsedByParent() const { return bIsCollapsedByParent; }
    virtual bool UsingApplicationMenuStack() const override { return true; }
 
protected:
    FMenuBase(TSharedRef<SWidget> InContent, const bool bCollapsedByParent);
 
    FOnMenuDismissed OnMenuDismissed;
    TSharedRef<SWidget> Content;
    bool bDismissing;
    bool bIsCollapsedByParent;
};
 
class FMenuInWindow : public FMenuBase
{
public:
    FMenuInWindow(TSharedRef<SWindow> InWindow, TSharedRef<SWidget> InContent, const bool bIsCollapsedByParent);
    virtual ~FMenuInWindow() {}
 
    virtual EPopupMethod GetPopupMethod() const override { return EPopupMethod::CreateNewWindow; }
    virtual TSharedPtr<SWindow> GetParentWindow() const override;
    virtual TSharedPtr<SWindow> GetOwnedWindow() const override { return GetParentWindow(); }
    virtual void Dismiss() override;
 
private:
    TWeakPtr<SWindow> Window;
};
 
class FMenuInPopup : public FMenuBase
{
public:
    FMenuInPopup(TSharedRef<SWidget> InContent, const bool bIsCollapsedByParent);
    virtual ~FMenuInPopup() {}
 
    virtual EPopupMethod GetPopupMethod() const { return EPopupMethod::UseCurrentWindow; }
    virtual TSharedPtr<SWindow> GetParentWindow() const;
    virtual TSharedPtr<SWindow> GetOwnedWindow() const { return TSharedPtr<SWindow>(); }
    virtual void Dismiss() override;
};
 
class FMenuInHostWidget : public FMenuBase
{
public:
    FMenuInHostWidget(TSharedRef<IMenuHost> InHost, const TSharedRef<SWidget>& InContent, const bool bIsCollapsedByParent);
    virtual ~FMenuInHostWidget() {}
 
    virtual EPopupMethod GetPopupMethod() const { return EPopupMethod::UseCurrentWindow; }
    virtual TSharedPtr<SWindow> GetParentWindow() const;
    virtual TSharedPtr<SWindow> GetOwnedWindow() const { return TSharedPtr<SWindow>(); }
    virtual void Dismiss() override;
    virtual bool UsingApplicationMenuStack() const override;
 
private:
    TWeakPtr<IMenuHost> MenuHost;
};