LyraStarterGame/Source/LyraGame/GameFeatures/GameFeatureAction_AddWidget.cpp

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

#include "GameFeatureAction_AddWidget.h"
#include "Components/GameFrameworkComponentManager.h"
#include "Engine/GameInstance.h"
#include "GameFeatures/GameFeatureAction_WorldActionBase.h"
#include "GameFeaturesSubsystemSettings.h"
#include "CommonUIExtensions.h"
#include "UI/LyraHUD.h"

#if WITH_EDITOR
#include "Misc/DataValidation.h"
#endif

#include UE_INLINE_GENERATED_CPP_BY_NAME(GameFeatureAction_AddWidget)

#define LOCTEXT_NAMESPACE "LyraGameFeatures"

//////////////////////////////////////////////////////////////////////
// UGameFeatureAction_AddWidgets

void UGameFeatureAction_AddWidgets::OnGameFeatureDeactivating(FGameFeatureDeactivatingContext& Context)
{
	Super::OnGameFeatureDeactivating(Context);

	FPerContextData* ActiveData = ContextData.Find(Context);
	if ensure(ActiveData)
	{
		Reset(*ActiveData);
	}
}

#if WITH_EDITORONLY_DATA
void UGameFeatureAction_AddWidgets::AddAdditionalAssetBundleData(FAssetBundleData& AssetBundleData)
{
	for (const FLyraHUDElementEntry& Entry : Widgets)
	{
		AssetBundleData.AddBundleAsset(UGameFeaturesSubsystemSettings::LoadStateClient, Entry.WidgetClass.ToSoftObjectPath().GetAssetPath());
	}
}
#endif

#if WITH_EDITOR
EDataValidationResult UGameFeatureAction_AddWidgets::IsDataValid(FDataValidationContext& Context) const
{
	EDataValidationResult Result = CombineDataValidationResults(Super::IsDataValid(Context), EDataValidationResult::Valid);

	{
		int32 EntryIndex = 0;
		for (const FLyraHUDLayoutRequest& Entry : Layout)
		{
			if (Entry.LayoutClass.IsNull())
			{
				Result = EDataValidationResult::Invalid;
				Context.AddError(FText::Format(LOCTEXT("LayoutHasNullClass", "Null WidgetClass at index {0} in Layout"), FText::AsNumber(EntryIndex)));
			}

			if (!Entry.LayerID.IsValid())
			{
				Result = EDataValidationResult::Invalid;
				Context.AddError(FText::Format(LOCTEXT("LayoutHasNoTag", "LayerID is not set at index {0} in Widgets"), FText::AsNumber(EntryIndex)));
			}

			++EntryIndex;
		}
	}

	{
		int32 EntryIndex = 0;
		for (const FLyraHUDElementEntry& Entry : Widgets)
		{
			if (Entry.WidgetClass.IsNull())
			{
				Result = EDataValidationResult::Invalid;
				Context.AddError(FText::Format(LOCTEXT("EntryHasNullClass", "Null WidgetClass at index {0} in Widgets"), FText::AsNumber(EntryIndex)));
			}

			if (!Entry.SlotID.IsValid())
			{
				Result = EDataValidationResult::Invalid;
				Context.AddError(FText::Format(LOCTEXT("EntryHasNoTag", "SlotID is not set at index {0} in Widgets"), FText::AsNumber(EntryIndex)));
			}
			++EntryIndex;
		}
	}

	return Result;
}
#endif

void UGameFeatureAction_AddWidgets::AddToWorld(const FWorldContext& WorldContext, const FGameFeatureStateChangeContext& ChangeContext)
{
	UWorld* World = WorldContext.World();
	UGameInstance* GameInstance = WorldContext.OwningGameInstance;
	FPerContextData& ActiveData = ContextData.FindOrAdd(ChangeContext);

	if ((GameInstance != nullptr) && (World != nullptr) && World->IsGameWorld())
	{
		if (UGameFrameworkComponentManager* ComponentManager = UGameInstance::GetSubsystem<UGameFrameworkComponentManager>(GameInstance))
		{			
			TSoftClassPtr<AActor> HUDActorClass = ALyraHUD::StaticClass();

			TSharedPtr<FComponentRequestHandle> ExtensionRequestHandle = ComponentManager->AddExtensionHandler(
				HUDActorClass,
				UGameFrameworkComponentManager::FExtensionHandlerDelegate::CreateUObject(this, &ThisClass::HandleActorExtension, ChangeContext));
			ActiveData.ComponentRequests.Add(ExtensionRequestHandle);
		}
	}
}

void UGameFeatureAction_AddWidgets::Reset(FPerContextData& ActiveData)
{
	ActiveData.ComponentRequests.Empty();

	for (TPair<FObjectKey, FPerActorData>& Pair : ActiveData.ActorData)
	{
		for (FUIExtensionHandle& Handle : Pair.Value.ExtensionHandles)
		{
			Handle.Unregister();
		}
	}
	ActiveData.ActorData.Empty();
}

void UGameFeatureAction_AddWidgets::HandleActorExtension(AActor* Actor, FName EventName, FGameFeatureStateChangeContext ChangeContext)
{
	FPerContextData& ActiveData = ContextData.FindOrAdd(ChangeContext);
	if ((EventName == UGameFrameworkComponentManager::NAME_ExtensionRemoved) || (EventName == UGameFrameworkComponentManager::NAME_ReceiverRemoved))
	{
		RemoveWidgets(Actor, ActiveData);
	}
	else if ((EventName == UGameFrameworkComponentManager::NAME_ExtensionAdded) || (EventName == UGameFrameworkComponentManager::NAME_GameActorReady))
	{
		AddWidgets(Actor, ActiveData);
	}
}

void UGameFeatureAction_AddWidgets::AddWidgets(AActor* Actor, FPerContextData& ActiveData)
{
	ALyraHUD* HUD = CastChecked<ALyraHUD>(Actor);

	if (!HUD->GetOwningPlayerController())
	{
		return;
	}

	if (ULocalPlayer* LocalPlayer = Cast<ULocalPlayer>(HUD->GetOwningPlayerController()->Player))
	{
		FPerActorData& ActorData = ActiveData.ActorData.FindOrAdd(HUD);

		for (const FLyraHUDLayoutRequest& Entry : Layout)
		{
			if (TSubclassOf<UCommonActivatableWidget> ConcreteWidgetClass = Entry.LayoutClass.Get())
			{
				ActorData.LayoutsAdded.Add(UCommonUIExtensions::PushContentToLayer_ForPlayer(LocalPlayer, Entry.LayerID, ConcreteWidgetClass));
			}
		}

		UUIExtensionSubsystem* ExtensionSubsystem = HUD->GetWorld()->GetSubsystem<UUIExtensionSubsystem>();
		for (const FLyraHUDElementEntry& Entry : Widgets)
		{
			ActorData.ExtensionHandles.Add(ExtensionSubsystem->RegisterExtensionAsWidgetForContext(Entry.SlotID, LocalPlayer, Entry.WidgetClass.Get(), -1));
		}
	}
}

void UGameFeatureAction_AddWidgets::RemoveWidgets(AActor* Actor, FPerContextData& ActiveData)
{
	ALyraHUD* HUD = CastChecked<ALyraHUD>(Actor);

	// Only unregister if this is the same HUD actor that was registered, there can be multiple active at once on the client
	FPerActorData* ActorData = ActiveData.ActorData.Find(HUD);

	if (ActorData)
	{
		for (TWeakObjectPtr<UCommonActivatableWidget>& AddedLayout : ActorData->LayoutsAdded)
		{
			if (AddedLayout.IsValid())
			{
				AddedLayout->DeactivateWidget();
			}
		}

		for (FUIExtensionHandle& Handle : ActorData->ExtensionHandles)
		{
			Handle.Unregister();
		}
		ActiveData.ActorData.Remove(HUD);
	}
}

#undef LOCTEXT_NAMESPACE