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More work on handlers

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This commit is contained in:
jyelon
2026-03-12 01:31:57 -04:00
parent d69fc4cd1e
commit cf9ffc619c
34 changed files with 88 additions and 116 deletions
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39
Plugins/BlueprintMCP/Source/BlueprintMCP/Handlers/GraphNode_Delete.h
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@@ -5,10 +5,6 @@
#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"
@@ -27,8 +23,8 @@ public:
virtual FString GetDescription() const override
{
return TEXT("Delete a node from a Blueprint graph. "
"Cannot delete entry nodes (FunctionEntry, Event, CustomEvent).");
return TEXT("Delete a node from a graph. "
"Cannot delete undeletable nodes (entry points, root nodes, etc).");
}
virtual void Handle(const FJsonObject* Json, FStringBuilderBase& Result) override
@@ -38,42 +34,21 @@ public:
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))
if (!FoundNode->CanUserDeleteNode())
{
MCPErrorCallback Error(Result);
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."),
TEXT("Cannot delete node '%s' in graph '%s' — it is not deletable."),
*NodeTitle, *GraphName));
}
F.PreEdit();
FoundNode->BreakAllNodeLinks();
Graph->RemoveNode(FoundNode);
FBlueprintEditorUtils::MarkBlueprintAsStructurallyModified(BP);
F.PostEdit();
Result.Appendf(TEXT("Deleted node '%s' from graph '%s'.\n"), *NodeTitle, *GraphName);
}