feat: lines first iteration

Source/UTAD_UI/SkillTree/SkillTreeConnectionsWidget.h

@@ -0,0 +1,106 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "SkillTreeTypes.h"
+#include "SkillTreeConnectionsWidget.generated.h"
+
+class USkillTreeComponent;
+class UUserWidget;
+class UWidget;
+
+/**
+ * Widget that automatically draws connection lines between skill tree nodes
+ * Place this widget in your skill tree UI and it will handle all line rendering
+ */
+UCLASS()
+class UTAD_UI_API USkillTreeConnectionsWidget : public UUserWidget
+{
+	GENERATED_BODY()
+
+public:
+	USkillTreeConnectionsWidget(const FObjectInitializer& ObjectInitializer);
+
+	// Parent widget to search for skill nodes (can be the skill tree widget
+	// itself) If not set, will search from the outer widget
+	UPROPERTY(EditAnywhere, BlueprintReadWrite,
+			  Category = "Skill Tree Connections")
+	UUserWidget* SkillTreeWidget;
+
+	// Reference to the skill tree component (set this in Blueprint)
+	UPROPERTY(EditAnywhere, BlueprintReadWrite,
+			  Category = "Skill Tree Connections")
+	USkillTreeComponent* SkillTreeComponent;
+
+	// Widget class for skill nodes
+	UPROPERTY(EditAnywhere, BlueprintReadWrite,
+			  Category = "Skill Tree Connections")
+	TSubclassOf<UUserWidget> SkillNodeWidgetClass;
+
+	// Line thickness in pixels
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Line Appearance",
+			  meta = (ClampMin = "0.5", ClampMax = "10.0"))
+	float LineThickness = 2.0f;
+
+	// Colors for different states
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Line Colors")
+	FLinearColor LockedColor = FLinearColor(0.3f, 0.3f, 0.3f, 1.0f);
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Line Colors")
+	FLinearColor AvailableColor = FLinearColor(1.0f, 1.0f, 1.0f, 1.0f);
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Line Colors")
+	FLinearColor SelectedColor = FLinearColor(1.0f, 0.84f, 0.0f, 1.0f);
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Line Colors")
+	FLinearColor PurchasedColor = FLinearColor(0.0f, 1.0f, 0.0f, 1.0f);
+
+	// Call this to refresh the lines (useful when skill states change)
+	UFUNCTION(BlueprintCallable, Category = "Skill Tree Connections")
+	void RefreshConnections();
+
+protected:
+	virtual int32 NativePaint(const FPaintArgs&		   Args,
+							  const FGeometry&		   AllottedGeometry,
+							  const FSlateRect&		   MyCullingRect,
+							  FSlateWindowElementList& OutDrawElements,
+							  int32 LayerId, const FWidgetStyle& InWidgetStyle,
+							  bool bParentEnabled) const override;
+
+	virtual void NativeConstruct() override;
+	virtual void NativeDestruct() override;
+
+private:
+	// Event handlers for skill tree component events
+	UFUNCTION()
+	void OnSkillStateChangedHandler(FName SkillID);
+	UFUNCTION()
+	void OnSkillSelectionChangedHandler(int32 TotalCost);
+	UFUNCTION()
+	void OnSkillPurchasedHandler(FName SkillID);
+
+	// Helper struct to store node information for drawing
+	struct FSkillNodeInfo
+	{
+		FName			SkillID;
+		FVector2D		Position;
+		ESkillNodeState State;
+		TArray<FName>	Prerequisites;
+	};
+
+	// Build the list of nodes and their info
+	void BuildNodeInfoList(TArray<FSkillNodeInfo>& OutNodeInfo) const;
+
+	// Recursively find all widgets of a specific class in the widget hierarchy
+	void FindWidgetsOfClass(UWidget* Root, TSubclassOf<UUserWidget> WidgetClass,
+							TArray<UUserWidget*>& OutWidgets) const;
+
+	// Get the color for a line based on the dependent node's state
+	FLinearColor GetLineColorForState(ESkillNodeState State) const;
+
+	// Get SkillID from a skill node widget (looks for "SkillID" property)
+	bool GetSkillIDFromWidget(UUserWidget* Widget, FName& OutSkillID) const;
+
+	// Cache for forcing redraws
+	mutable bool bNeedsRedraw = true;
+};