attempt to fake UnrealHeaderTool

Author: Roberto De Ioris

Source/UnrealEnginePython/Private/PyUserWidget.cpp

@@ -339,22 +339,55 @@ bool UPyUserWidget::NativeIsInteractable() const
 	return false;
 }
 
+#if ENGINE_MINOR_VERSION < 20
 void UPyUserWidget::NativePaint(FPaintContext & InContext) const
+#else
+int32 UPyUserWidget::NativePaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
+#endif
 {
+
+#if ENGINE_MINOR_VERSION >= 20
+	FPaintContext InContext(AllottedGeometry, MyCullingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
+#endif
+
 	if (!py_user_widget_instance)
+#if ENGINE_MINOR_VERSION >= 20
+		return -1;
+#else
 		return;
+#endif
 
 	FScopePythonGIL gil;
 
 	if (!PyObject_HasAttrString(py_user_widget_instance, (char *)"paint"))
+#if ENGINE_MINOR_VERSION >= 20
+		return -1;
+#else
 		return;
+#endif
 
 	PyObject *ret = PyObject_CallMethod(py_user_widget_instance, (char *)"paint", (char *)"O", py_ue_new_fpaint_context(InContext));
 	if (!ret) {
 		unreal_engine_py_log_error();
+#if ENGINE_MINOR_VERSION >= 20
+		return -1;
+#else
 		return;
+#endif
 	}
+#if ENGINE_MINOR_VERSION >= 20
+	int32 RetValue = -1;
+	if (PyNumber_Check(ret))
+	{
+		PyObject *py_value = PyNumber_Long(ret);
+		RetValue = PyLong_AsLong(py_value);
+		Py_DECREF(py_value);
+	}
+#endif
 	Py_DECREF(ret);
+#if ENGINE_MINOR_VERSION >= 20
+	return RetValue;
+#endif
 }
 
 UPyUserWidget::UPyUserWidget(const FObjectInitializer& ObjectInitializer)

Source/UnrealEnginePython/Public/PyUserWidget.h

@@ -2,9 +2,16 @@
 
 #include "Runtime/UMG/Public/Blueprint/UserWidget.h"
 #include "UnrealEnginePython.h"
+#include "Runtime/Launch/Resources/Version.h"
 #include "PyUserWidget.generated.h"
 
-
+#if ENGINE_MINOR_VERSION < 20
+#define NativePaintArgs FPaintContext & InContext
+#define NativePaintRetValue void
+#else
+#define NativePaintArgs const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled
+#define NativePaintRetValue int32
+#endif
 
 UCLASS(BlueprintType, Blueprintable)
 class UNREALENGINEPYTHON_API UPyUserWidget : public UUserWidget
@@ -21,7 +28,7 @@ class UNREALENGINEPYTHON_API UPyUserWidget : public UUserWidget
 	// Called every frame
 	virtual void NativeTick(const FGeometry & MyGeometry, float InDeltaTime) override;
 
-	virtual void NativePaint(FPaintContext & InContext) const override;
+	virtual NativePaintRetValue NativePaint(NativePaintArgs) const override;
 
 	virtual bool NativeIsInteractable() const override;