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

#pragma once

#include "CoreMinimal.h"
#include "Engine/EngineBaseTypes.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SCompoundWidget.h"
#include "Animation/CurveSequence.h"
#include "Editor/UnrealEdTypes.h"

class SMenuAnchor;

/**
 * A level viewport toolbar widget that is placed in a viewport
 */
class UNREALED_API SViewportToolBar: public SCompoundWidget
{
public:
    SLATE_BEGIN_ARGS(SViewportToolBar) {}
    SLATE_END_ARGS()

    void Construct(const FArguments& InArgs);

    /**
     * @return The currently open pull down menu if there is one
     */
    TWeakPtr<SMenuAnchor> GetOpenMenu() const;

    /**
     * Sets the open menu to a new menu and closes any currently opened one
     *
     * @param NewMenu The new menu that is opened
     */
    void SetOpenMenu(TSharedPtr<SMenuAnchor>& NewMenu);

    /**
     * @return The color and opacity of this viewport.
     */
    FLinearColor OnGetColorAndOpacity() const;

    /** @return Whether the given viewmode is supported. */
    virtual bool IsViewModeSupported(EViewModeIndex ViewModeIndex) const;

private:
    /**
     * Called when the mouse enters the toolbar area.  We fade in the toolbar when this happens
     *
     * @param MyGeometry	Information about the size of the toolbar
     * @param MouseEvent	The mouse event that triggered this function
     */
    virtual void OnMouseEnter(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;

    /**
     * Called when the mouse leaves the toolbar area.  We fade out the toolbar when this happens
     *
     * @param MouseEvent	The mouse event that triggered this function
     */
    virtual void OnMouseLeave(const FPointerEvent& MouseEvent) override;

protected:
    /**
     * Returns the label for the "Camera" tool bar menu based on based viewport type
     *
     * @param ViewportType	The Viewport type we want the label for
     *
     * @return	Label to use for this menu label
     */
    virtual FText GetCameraMenuLabelFromViewportType(const ELevelViewportType ViewportType) const;

    /**
     * Returns the label icon for the "Camera" tool bar menu, which changes depending on the viewport type
     *
     * @param ViewportType	The Viewport type we want the icon for
     *
     * @return	Label icon to use for this menu label
     */
    virtual const FSlateBrush* GetCameraMenuLabelIconFromViewportType(const ELevelViewportType ViewportType) const;

private:
    /** Curve sequence for fading out the toolbar */
    FCurveSequence FadeOutSequence;
    /** Curve sequence for fading in the toolbar */
    FCurveSequence FadeInSequence;
    /** The pulldown menu that is open if any */
    TWeakPtr<SMenuAnchor> OpenedMenu;
    /** True if the mouse is inside the toolbar */
    bool bIsHovered;
};