// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Input/Reply.h"
#include "Textures/SlateIcon.h"
#include "Widgets/SCompoundWidget.h"
#include "SViewportToolBar.h"
#include "Framework/SlateDelegates.h"

class SMenuAnchor;

/**
 * Custom widget to display an icon/drop down menu.
 *	Displayed as shown:
 * +--------+-------------+
 * | Icon     Menu button |
 * +--------+-------------+
 */
class UNREALED_API SViewportToolBarIconMenu: public SCompoundWidget
{
public:
    SLATE_BEGIN_ARGS(SViewportToolBarIconMenu) {}

    /** We need to know about the toolbar we are in */
    SLATE_ARGUMENT(TSharedPtr<class SViewportToolBar>, ParentToolBar);

    /** Content for the drop down menu  */
    SLATE_EVENT(FOnGetContent, OnGetMenuContent)

    /** Icon shown */
    SLATE_ATTRIBUTE(FSlateIcon, Icon)

    /** Label shown on the menu button */
    SLATE_ATTRIBUTE(FText, Label)

    /** Overall style */
    SLATE_ATTRIBUTE(FName, Style)

    SLATE_END_ARGS()

    /**
     * Construct this widget
     *
     * @param	InArgs	The declaration data for this widget
     */
    void Construct(const FArguments& InArgs);

private:
    /**
     * Called when the menu button is clicked.  Will toggle the visibility of the menu content
     */
    FReply OnMenuClicked();

    /**
     * Called when the mouse enters a menu button.  If there was a menu previously opened
     * we open this menu automatically
     */
    void OnMouseEnter(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent);

private:
    /** Our menus anchor */
    TSharedPtr<SMenuAnchor> MenuAnchor;

    /** Parent tool bar for querying other open menus */
    TWeakPtr<class SViewportToolBar> ParentToolBar;
};