Started to implement GUI for session connections

Source/TurnBasedTutorial/MyMainMenu.cpp

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "MyMainMenu.h"
+
+#include "Components/Button.h"
+#include "Kismet/GameplayStatics.h"
+
+void UMyMainMenu::NativeConstruct()
+{
+	Super::NativeConstruct();
+
+	HostOnlineGameButton->OnClicked.AddDynamic(this, &ThisClass::UMyMainMenu::OnHostOnlineGameButtonClicked);
+}	
+
+void UMyMainMenu::OnHostOnlineGameButtonClicked()
+{
+	GetMyGameSubsystem()->CreateSession(2, true);
+	UGameplayStatics::OpenLevel(GetWorld(), FName(TEXT("BattleFieldMap")));
+	this->RemoveFromParent();
+}
+
+UMyGameInstanceSubsystem* UMyMainMenu::GetMyGameSubsystem() const
+{
+	const UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(GetWorld());
+	UMyGameInstanceSubsystem* GameInstanceSubsystem = GameInstance->GetSubsystem<UMyGameInstanceSubsystem>();
+	return GameInstanceSubsystem;
+}
+

Source/TurnBasedTutorial/MyMainMenu.h

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "MyGameInstanceSubsystem.h"
+
+#include "MyMainMenu.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class TURNBASEDTUTORIAL_API UMyMainMenu : public UUserWidget
+{
+	GENERATED_BODY()
+
+public:
+	UPROPERTY(meta = (BindWidget))
+	class UButton* HostOnlineGameButton;
+
+	virtual void NativeConstruct() override;
+
+protected:
+	UFUNCTION()
+	void OnHostOnlineGameButtonClicked();
+
+private:
+	UMyGameInstanceSubsystem* GetMyGameSubsystem() const;	
+};

Source/TurnBasedTutorial/MySessionListWidget.cpp

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "MySessionListWidget.h"
+
+#include "MyGameInstanceSubsystem.h"
+#include "Kismet/GameplayStatics.h"
+
+void UMySessionListWidget::NativeConstruct()
+{
+	Super::NativeConstruct();
+
+	const auto MyGameInstanceSubsystem = GetMyGameSubsystem();
+	MyGameInstanceSubsystem->OnFindSessionsCompleteEvent.AddUObject(this, &ThisClass::FillSessionListFromDelegate);
+
+
+	// Initiate search
+	MyGameInstanceSubsystem->FindSessions(10, true);
+}
+
+void UMySessionListWidget::FillSessionListFromDelegate(const TArray<FOnlineSessionSearchResult>& SessionResults,
+                                                       bool bSuccessful)
+{
+	UE_LOG(LogTemp, Warning, TEXT("FIND SESSION DELEGATED %d %d"), bSuccessful, SessionResults.Num());
+}
+
+UMyGameInstanceSubsystem* UMySessionListWidget::GetMyGameSubsystem() const
+{
+	const UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(GetWorld());
+	UMyGameInstanceSubsystem* GameInstanceSubsystem = GameInstance->GetSubsystem<UMyGameInstanceSubsystem>();
+	return GameInstanceSubsystem;
+}

Source/TurnBasedTutorial/MySessionListWidget.h

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "MyGameInstanceSubsystem.h"
+
+#include "Blueprint/UserWidget.h"
+#include "MySessionListWidget.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class TURNBASEDTUTORIAL_API UMySessionListWidget : public UUserWidget
+{
+	GENERATED_BODY()
+
+protected:
+	virtual void NativeConstruct() override;
+	
+	UPROPERTY(meta = (BindWidget))
+	class UButton* ConnectToSelectedSessionButton;
+
+	UPROPERTY(meta = (BindWidget))
+	class UButton* GoBackToMainMenuButton;
+
+	UPROPERTY(meta = (BindWidget))
+	class UListView* AvailableSessionsList;
+
+	void FillSessionListFromDelegate(const TArray<FOnlineSessionSearchResult>& SessionResults, bool bSuccessful);
+
+private:
+	UMyGameInstanceSubsystem* GetMyGameSubsystem() const;	
+};