Broad rearrangement of handlers

2026-03-12 00:44:17 -04:00
parent 2e058035f3
commit d69fc4cd1e
98 changed files with 270 additions and 1032 deletions
--- a/Plugins/BlueprintMCP/Source/BlueprintMCP/Handlers/GraphNode_Delete.h
+++ b/Plugins/BlueprintMCP/Source/BlueprintMCP/Handlers/GraphNode_Delete.h
@@ -0,0 +1,80 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "MCPHandler.h"
+#include "MCPFetcher.h"
+#include "MCPUtils.h"
+#include "EdGraph/EdGraphNode.h"
+#include "K2Node_Event.h"
+#include "K2Node_CustomEvent.h"
+#include "K2Node_FunctionEntry.h"
+#include "Kismet2/BlueprintEditorUtils.h"
+#include "GraphNode_Delete.generated.h"
+
+
+// ---------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
+
+UCLASS()
+class UMCP_GraphNode_Delete : public UObject, public IMCPHandler
+{
+	GENERATED_BODY()
+
+public:
+	UPROPERTY(meta=(Description="Path to the node, e.g. /Game/Foo,graph:EventGraph,node:MyNode"))
+	FString Node;
+
+	virtual FString GetDescription() const override
+	{
+		return TEXT("Delete a node from a Blueprint graph. "
+			"Cannot delete entry nodes (FunctionEntry, Event, CustomEvent).");
+	}
+
+	virtual void Handle(const FJsonObject* Json, FStringBuilderBase& Result) override
+	{
+		MCPFetcher F(Result);
+		UEdGraphNode* FoundNode = F.Walk(Node).Cast<UEdGraphNode>();
+		if (!FoundNode) return;
+
+		UEdGraph* Graph = FoundNode->GetGraph();
+		UBlueprint* BP = FBlueprintEditorUtils::FindBlueprintForNodeChecked(FoundNode);
+
+		// Protect root/entry nodes — deleting these leaves the graph in an invalid
+		// state with no root node, causing compiler errors that can't be fixed
+		// without recreating the entire function/event.
+		MCPErrorCallback Error(Result);
+		FString NodeTitle = MCPUtils::FormatName(FoundNode);
+		FString GraphName = MCPUtils::FormatName(Graph);
+
+		if (Cast<UK2Node_FunctionEntry>(FoundNode))
+		{
+			return Error.SetError(FString::Printf(
+				TEXT("Cannot delete FunctionEntry node '%s' in graph '%s'. ")
+				TEXT("This is the root node of the function — removing it would leave an empty, uncompilable graph. ")
+				TEXT("To remove the entire function, delete it from the Blueprint editor."),
+				*NodeTitle, *GraphName));
+		}
+		if (Cast<UK2Node_Event>(FoundNode))
+		{
+			return Error.SetError(FString::Printf(
+				TEXT("Cannot delete event entry node '%s' in graph '%s'. ")
+				TEXT("This is the root node of the event handler — removing it would leave an empty, uncompilable graph."),
+				*NodeTitle, *GraphName));
+		}
+		if (Cast<UK2Node_CustomEvent>(FoundNode))
+		{
+			return Error.SetError(FString::Printf(
+				TEXT("Cannot delete CustomEvent entry node '%s' in graph '%s'. ")
+				TEXT("This is the root node of the custom event — removing it would leave an empty, uncompilable graph."),
+				*NodeTitle, *GraphName));
+		}
+
+		FoundNode->BreakAllNodeLinks();
+		Graph->RemoveNode(FoundNode);
+
+		FBlueprintEditorUtils::MarkBlueprintAsStructurallyModified(BP);
+
+		Result.Appendf(TEXT("Deleted node '%s' from graph '%s'.\n"), *NodeTitle, *GraphName);
+	}
+};