BPFL_AddWindow.hpp

// .h
#pragma once

#include "CoreMinimal.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "BPFL_AddWindow.generated.h"

UCLASS()
class BLOGTEST416B_API UBPFL_AddWindow : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()
	
public:
	UFUNCTION(BlueprintCallable, Category = "Slate", meta = (HidePin = "worldContextObject_", DefaultToSelf = "worldContextObject_"))
		static void AddWindow(UObject* worldContextObject_);

};


// .cpp
#include "BPFL_AddWindow.h"
#include "Engine.h"
#include "SWindow.h"
#include "SlateApplication.h"

#define LOCTEXT_NAMESPACE "BPFL_AddWidget" 

void UBPFL_AddWindow::AddWindow(UObject* worldContextObject_)
{
	TSharedRef<SWindow> window = SNew(SWindow)
		.Title(LOCTEXT("CreateWindow", "Test Slate Window"))
		.ClientSize(FVector2D(512.0f, 512.0f))
		[
			SNew(SVerticalBox)
			+ SVerticalBox::Slot()
			.VAlign(VAlign_Center)
			.HAlign(HAlign_Center)
			[
				SNew(SButton)
				.Text(LOCTEXT("CreateButton", "Push Me!"))
			]
		];

	FSlateApplication::Get().AddWindowAsNativeChild(window, GEngine->GameViewport->GetWindow().ToSharedRef(), true);

	window->ShowWindow();
}

#undef LOCTEXT_NAMESPACE