TMap Crash

BaseNavigableMenuStructure.cpp

// Copyright 2015 Hypercane Studios

#include "SpaceGame.h"
#include "BaseNavigableMenuStructure.h"

UBaseNavigableMenuStructure::UBaseNavigableMenuStructure(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	Up = nullptr;
	Down = nullptr;
	Left = nullptr;
	Right = nullptr;
}

BaseNavigableMenuStructure.h

// Copyright 2015 Hypercane Studios

#pragma once

#include "UMG.h"
#include "BaseNavigableMenuStructure.generated.h"
/**
 * 
 */
UCLASS()
class SPACEGAME_API UBaseNavigableMenuStructure : public UObject
{
	GENERATED_BODY()
public:
	UBaseNavigableMenuStructure(const FObjectInitializer& ObjectInitializer);

	// Item above you
	UPROPERTY()
	UWidget* Up;

	// Item below you
	UPROPERTY()
	UWidget* Down;

	// Item to the left of you
	UPROPERTY()
	UWidget* Left;

	// Item to the right of you
	UPROPERTY()
	UWidget* Right;

	// The index of this entry in the InventoryArray
	UPROPERTY()
	int32 InventoryArrayIndex;
};

GamepadNavigableUserWidget.cpp

#include "SpaceGame.h"
#include "GamepadNavigableUserWidget.h"

void UGamepadNavigableUserWidget::NativeConstruct()
{
	Super::NativeConstruct();
	
	for (auto& MenuX : BlueprintDefinedMenuNavigation)
	{
		UWidget* menuItem = WidgetTree->FindWidget(MenuX.MenuItem);
		UWidget* left = WidgetTree->FindWidget(MenuX.Left);
		UWidget* right = WidgetTree->FindWidget(MenuX.Right);
		UWidget* up = WidgetTree->FindWidget(MenuX.Up);
		UWidget* down = WidgetTree->FindWidget(MenuX.Down);
		
		UBaseNavigableMenuStructure* navigation = NewObject<UBaseNavigableMenuStructure>(UBaseNavigableMenuStructure::StaticClass());
		navigation->Up = up;
		navigation->Down = down;
		navigation->Left = left;
		navigation->Right = right;

		NavigationMap.Add(menuItem, navigation);
	}
}

GamepadNavigableUserWidget.h

// Copyright 2015 Hypercane Studios

#pragma once

#include "Blueprint/UserWidget.h"
#include "UMG.h"
#include "BaseNavigableMenuStructure.h"
#include "GamepadNavigableUserWidget.generated.h"

// This struct is used to define a menu item via blueprint
USTRUCT(Blueprintable)
struct FMenuNavigationStructure
{
	GENERATED_USTRUCT_BODY()
	
	// The name of this menu item
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Navigation")
	FName MenuItem;

	// The name of the menu item above this item (or None)
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Navigation")
	FName Up;

	// The name of the menu item below this item (or None)
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Navigation")
	FName Down;

	// The name of the menu item left of this item (or None)
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Navigation")
	FName Left;

	// The name of the menu item right of this item (or None)
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Navigation")
	FName Right;
};

UCLASS()
class SPACEGAME_API UGamepadNavigableUserWidget : public UUserWidget
{
	GENERATED_BODY()
public:
	virtual void NativeConstruct() override;

	// This allows defining menu layout from blueprint
	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "HUD")
	TArray<FMenuNavigationStructure> BlueprintDefinedMenuNavigation;
	
	// Used to hold the navigation map for the menu
	UPROPERTY()
	TMap<UWidget*, UBaseNavigableMenuStructure*> NavigationMap;
};