Create an UMG Widget, or subclass an existing UMG widget
In the previous tutorial we covered creating a C++ subclass of
UUserWidget.
The alternative to this is to create a C++ subclass of an existing
Good for creating new compound widgets that you want to re-use everywhere
e.g. a button with an icon and text
RebuildWidget() is where you set up stuff
Look at existing widgets to see how they work
We can see inside the RebuildWidget() function for UButton
It creates a new instance of the Slate class SButton.
TSharedRef<SWidget> UButton::RebuildWidget()
{
MyButton = SNew(SButton)
.OnClicked(BIND_UOBJECT_DELEGATE(FOnClicked,
SlateHandleClicked))
.OnPressed(BIND_UOBJECT_DELEGATE(FSimpleDelegate,
SlateHandlePressed))
.OnReleased(BIND_UOBJECT_DELEGATE(FSimpleDelegate,
SlateHandleReleased))
.OnHovered_UObject(this, &ThisClass::SlateHandleHovered)
.OnUnhovered_UObject(this, &ThisClass::SlateHandleUnhovered)
.ButtonStyle(&WidgetStyle)
.ClickMethod(ClickMethod)
.TouchMethod(TouchMethod)
.IsFocusable(IsFocusable)
;
if ( GetChildrenCount() > 0 )
{
Cast<UButtonSlot>(GetContentSlot())
->BuildSlot(MyButton.ToSharedRef());
}
return MyButton.ToSharedRef();
}
ExampleOverlay.h
// .h file
UCLASS()
class UExampleOverlay : public UOverlay
{
GENERATED_UCLASS_BODY()
public:
#if WITH_EDITOR
virtual const FText GetPaletteCategory() override;
#endif
protected:
// UWidget interface
virtual TSharedRef<SWidget> RebuildWidget() override;
// End of UWidget interface
};
ExampleOverlay.cpp
// .cpp file
#define LOCTEXT_NAMESPACE "ExampleUMG"
TSharedRef<SWidget> UExampleOverlay::RebuildWidget()
{
auto Result = Super::RebuildWidget();
for (UPanelSlot* InSlot : Slots)
{
// Do something custom
}
return Result;
}
#if WITH_EDITOR
const FText UExampleOverlay::GetPaletteCategory()
{
return LOCTEXT("ExampleUI", "ExampleOverlay");
}
#endif
In the next and final tutorial of the series, we will discuss how to create subclasses of Slate widgets.
