// 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/MultiBox/MultiBoxDefs.h"
#include "Widgets/Input/SCheckBox.h"

class SMenuAnchor;

/**
 * Custom widget to display a toggle/drop down menu.
 *	Displayed as shown:
 * +--------+-------------+
 * | Toggle | Menu button |
 * +--------+-------------+
 */
class UNREALED_API SViewportToolBarComboMenu: public SCompoundWidget
{
public:
    SLATE_BEGIN_ARGS(SViewportToolBarComboMenu): _BlockLocation(EMultiBlockLocation::Start), _MinDesiredButtonWidth(-1.0f) {}

    /** 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)

    /** Called upon state change with the value of the next state */
    SLATE_EVENT(FOnCheckStateChanged, OnCheckStateChanged)

    /** Sets the current checked state of the checkbox */
    SLATE_ATTRIBUTE(ECheckBoxState, IsChecked)

    /** Icon shown on the toggle button */
    SLATE_ATTRIBUTE(FSlateIcon, Icon)

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

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

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

    /** ToolTip shown on the toggle button */
    SLATE_ATTRIBUTE(FText, ToggleButtonToolTip)

    /** The button location */
    SLATE_ARGUMENT(EMultiBlockLocation::Type, BlockLocation)

    /** The minimum desired width of the menu button contents */
    SLATE_ARGUMENT(float, MinDesiredButtonWidth)

    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;
};