Started radial menu setup

Source/NakedDesire/UI/RadialMenu/RadialSliceWidget.h

@@ -0,0 +1,55 @@
+// RadialSliceWidget.h
+// A single wedge of the radial menu. One of these exists per entry, each with
+// its own dynamic material instance. It knows its own angular span and whether
+// it is currently the hovered slice — nothing about its neighbours.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "RadialSliceWidget.generated.h"
+
+class UImage;
+class UMaterialInstanceDynamic;
+
+UCLASS(Abstract)
+class URadialSliceWidget : public UUserWidget
+{
+	GENERATED_BODY()
+
+public:
+	// Called once when the slice is created. StartAngle/AngleSize are degrees,
+	// clockwise from 12 o'clock; the material uses them to draw just this wedge.
+	void Setup(UMaterialInterface* InSliceMaterial, float StartAngleDeg,
+		float AngleSizeDeg, UTexture2D* Icon, bool bEnabled);
+
+	// Smoothly animate this slice's highlight toward target (0 = off, 1 = on).
+	// Called every tick by the container with the *undilated* delta.
+	void UpdateHighlight(bool bIsHovered, float UndilatedDelta);
+
+protected:
+	virtual void NativeConstruct() override;
+
+	UPROPERTY(meta = (BindWidget))
+	TObjectPtr<UImage> WedgeImage = nullptr;
+
+	UPROPERTY(meta = (BindWidget))
+	TObjectPtr<UImage> IconImage = nullptr;
+
+	// Speed of the highlight ease. Higher = snappier.
+	UPROPERTY(EditDefaultsOnly, Category = "Radial Menu")
+	float HighlightInterpSpeed = 16.f;
+
+	// Distance in px from the menu center to the icon, placing it on the slice's
+	// centerline. Should sit between the material's InnerRadius and OuterRadius:
+	// roughly (InnerRadius + OuterRadius) * 0.5 * MenuDiameter.
+	UPROPERTY(EditDefaultsOnly, Category = "Radial Menu")
+	float IconRadius = 164.f;
+
+private:
+	UPROPERTY(Transient)
+	TObjectPtr<UMaterialInstanceDynamic> WedgeMID = nullptr;
+
+	bool bSliceEnabled = true;
+	float CurrentHighlight = 0.f;
+};