void FWidgetBlueprintEditor::UpdatePreview(UBlueprint* InBlueprint, bool bInForceFullUpdate)
{
UUserWidget* PreviewActor = GetPreview();
// Signal that we're going to be constructing editor components
if ( InBlueprint != nullptr && InBlueprint->SimpleConstructionScript != nullptr )
{
InBlueprint->SimpleConstructionScript->BeginEditorComponentConstruction();
}
// If the Blueprint is changing
if ( InBlueprint != PreviewBlueprint || bInForceFullUpdate )
{
// Destroy the previous actor instance
DestroyPreview();
// Save the Blueprint we're creating a preview for
PreviewBlueprint = Cast<UWidgetBlueprint>(InBlueprint);
// Update the generated class'es widget tree to match the blueprint tree. That way the preview can update
// without needing to do a full recompile.
Cast<UWidgetBlueprintGeneratedClass>(PreviewBlueprint->GeneratedClass)->DesignerWidgetTree = DuplicateObject<UWidgetTree>(PreviewBlueprint->WidgetTree, PreviewBlueprint->GeneratedClass);
PreviewActor = CreateWidget<UUserWidget>(PreviewScene.GetWorld(), PreviewBlueprint->GeneratedClass);
PreviewActor->SetFlags(RF_Transactional);
// Configure all the widgets to be set to design time.
PreviewActor->SetDesignerFlags(GetCurrentDesignerFlags());
// Store a reference to the preview actor.
PreviewWidgetPtr = PreviewActor;
}
OnWidgetPreviewUpdated.Broadcast();
}
UUserWidget* UWidgetBlueprintLibrary::Create(UObject* WorldContextObject, TSubclassOf<UUserWidget> WidgetType, APlayerController* OwningPlayer)
{
if ( WidgetType == nullptr || WidgetType->HasAnyClassFlags(CLASS_Abstract) )
{
return nullptr;
}
UUserWidget* UserWidget = nullptr;
if ( OwningPlayer == nullptr )
{
UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject);
UserWidget = CreateWidget<UUserWidget>(World, WidgetType);
}
else
{
UserWidget = CreateWidget<UUserWidget>(OwningPlayer, WidgetType);
}
if (UserWidget)
{
UserWidget->SetFlags(RF_StrongRefOnFrame);
}
return UserWidget;
}