LandscapeNotification.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#if WITH_EDITOR
 
#include "CoreMinimal.h"
#include "Landscape.h"
 
enum class ELandscapeNotificationType
{
    ShadingModelInvalid = 0,
    LandscapeTextureResourcesNotReady,
    LandscapeEditLayerResourcesNotReady,
};
 
struct FLandscapeNotification
{
    using FConditionCallback = TFunction<bool(void)>;
    using FUpdateTextCallback = TFunction<void(FText&)>;
 
    FLandscapeNotification(const TWeakObjectPtr<ALandscape>& InLandscape, ELandscapeNotificationType InNotificationType, FConditionCallback InConditionCallback = FConditionCallback([]() { return true; }), FUpdateTextCallback InUpdateTextCallback = [](FText& InText) {});
    ~FLandscapeNotification() = default;
 
    bool operator == (const FLandscapeNotification& Other) const;
    bool operator < (const FLandscapeNotification& Other) const;
 
    TWeakObjectPtr<ALandscape> GetLandscape() const { return Landscape; }
    ELandscapeNotificationType GetNotificationType() const { return NotificationType; }
 
    // Public wrappers for the callback functions.
    bool ShouldShowNotification() const;
    void SetNotificationText();
 
private:
    FLandscapeNotification() = delete;
 
public:
    FText NotificationText;
 
    double NotificationStartTime = -1.0;
 
private:
    TWeakObjectPtr<ALandscape> Landscape;
    ELandscapeNotificationType NotificationType;
 
    FConditionCallback ConditionCallback;
 
    FUpdateTextCallback UpdateTextCallback;
};
 
class FLandscapeNotificationManager
{
public:
    ~FLandscapeNotificationManager();
    
    void Tick();
 
    void RegisterNotification(const TWeakPtr<FLandscapeNotification>& InNotification);
    void UnregisterNotification(const TWeakPtr<FLandscapeNotification>& InNotification);
 
private:
    void ShowNotificationItem(const FText& InText);
    void HideNotificationItem();
 
private:
    TArray<TWeakPtr<FLandscapeNotification>> LandscapeNotifications;
    TWeakPtr<FLandscapeNotification> ActiveNotification;
    TWeakPtr<SNotificationItem> NotificationItem;
};
 
#endif // WITH_EDITOR