Problem creating UI using C++

Development Programming & Scripting UI
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1

Hello everyone,

I’m trying to create my widgets in C++ in the NativeConstruct method. Here’s what I have so far:

void UUIController::NativeConstruct()
{
    Super::NativeConstruct();
    UHorizontalBox *panel = WidgetTree->ConstructWidget<UHorizontalBox>();
    WidgetTree->RootWidget = panel;
    for (int i = 0; i < towerInfos.Num(); i++)
    {
        FTowerInfo *current = &towerInfos[i];
        if (towerWidget)
        {
            UUserWidget *newWidget = WidgetTree->ConstructWidget<UUserWidget>(towerWidget);
            if (newWidget)
            {
                UE_LOG (LogTemp, Warning, TEXT ("Instantiating New Widget."));
                panel->AddChildToHorizontalBox(newWidget);
                UCallbackButton *button = (UCallbackButton*)newWidget->GetWidgetFromName("MyButton");
                if (button)
                {
                    button->Initialize (FString::FromInt(i));
                    button->buttonCallback.AddUObject(this, &UUIController::OnButtonClicked);
                    UTextBlock *text = (UTextBlock*)button->GetChildAt(0);
                    if (text && current)
                    {
                        text->SetText(FText::FromString(current->name));
                    }
                }
            }
        }
    }
}

My widgets are being correctly instantiated using WidgetTree->ConstructWidget and towerWidget is set through a blueprint that inherits from UUIController.

In my Pawn I’m creating the widget in the BeginPlay method:

void ACameraMovementController::BeginPlay()
{
	Super::BeginPlay();
    SpawnEntity ();
    if (uiController)
    {
        UUIController *controller = CreateWidget<UUIController>(GetWorld(), uiController);
        if(controller)
        {
            controller->AddToViewport();
        }
    }
}

I get no error while on play mode. The widgets simply don’t appear.

Is there a quick solution for this? Maybe am I missing something?

Thank you for your attention.

2

When I replace the line

UUserWidget *newWidget = WidgetTree->ConstructWidget<UUserWidget>(towerWidget);

by

UUserWidget *newWidget = CreateWidget<UUserWidget>(towerWidget);

and

panel->AddChildToHorizontalBox(newWidget);

by

newWidget->AddToViewport();

It works. Of course I don’t get the desired effect of all my widets horizontally laid out. And I can’t both add the widget as a child of the panel and to the viewport. It throws an error in real time.

Any tips on how to solve this would be much appreciated.

3

Solved it by moving the code from void NativeConstruct to bool Initialize.