C++ UEdGraphNode::SnapToGrid方法代码示例

//------------------------------------------------------------------------------
static UEdGraphNode* FBlueprintMenuActionItemImpl::InvokeAction(const UBlueprintNodeSpawner* Action, UEdGraph* ParentGraph, FVector2D const Location, IBlueprintNodeBinder::FBindingSet const& Bindings, bool& bOutNewNode)
{
	int32 const PreSpawnNodeCount = ParentGraph->Nodes.Num();
	// this could return an existing node
	UEdGraphNode* SpawnedNode = Action->Invoke(ParentGraph, Bindings, Location);

	// if a returned node wasn't one that previously existed in the graph
	const bool bNewNode = PreSpawnNodeCount < ParentGraph->Nodes.Num();
	bOutNewNode = bNewNode;
	if (bNewNode)
	{
		check(SpawnedNode != nullptr);
		SpawnedNode->SnapToGrid(SNodePanel::GetSnapGridSize());

		FBlueprintEditorUtils::AnalyticsTrackNewNode(SpawnedNode);
	}
	// if this node already existed, then we just want to focus on that node...
	// some node types are only allowed one instance per blueprint (like events)
	else if (SpawnedNode != nullptr)
	{
		FKismetEditorUtilities::BringKismetToFocusAttentionOnObject(SpawnedNode);
	}

	return SpawnedNode;
}

UEdGraphNode* FEdGraphSchemaAction_K2NewNode::CreateNode(class UEdGraph* ParentGraph, UEdGraphPin* FromPin, const FVector2D Location, class UK2Node* NodeTemplate, bool bSelectNewNode/* = true*/)
{
	// Smart pointer that handles fixup after potential node reconstruction
	FWeakGraphPinPtr FromPinPtr = FromPin;

	// Duplicate template node to create new node
	UEdGraphNode* ResultNode = DuplicateObject<UK2Node>(NodeTemplate, ParentGraph);
	ResultNode->SetFlags(RF_Transactional);

	ParentGraph->AddNode(ResultNode, true, bSelectNewNode);

	ResultNode->CreateNewGuid();
	ResultNode->PostPlacedNewNode();
	ResultNode->AllocateDefaultPins();

	// For input pins, new node will generally overlap node being dragged off
	// Work out if we want to visually push away from connected node
	int32 XLocation = Location.X;
	if (FromPinPtr.IsValid() && FromPinPtr->Direction == EGPD_Input)
	{
		UEdGraphNode* PinNode = FromPinPtr->GetOwningNode();
		const float XDelta = FMath::Abs(PinNode->NodePosX - Location.X);

		if (XDelta < NodeDistance)
		{
			// Set location to edge of current node minus the max move distance
			// to force node to push off from connect node enough to give selection handle
			XLocation = PinNode->NodePosX - NodeDistance;
		}
	}
	ResultNode->NodePosX = XLocation;
	ResultNode->NodePosY = Location.Y;
	ResultNode->SnapToGrid(SNAP_GRID);

	// make sure to auto-wire after we position the new node (in case the 
	// auto-wire creates a conversion node to put between them)
	ResultNode->AutowireNewNode(FromPinPtr);

	// Update Analytics for the new nodes
	FBlueprintEditorUtils::AnalyticsTrackNewNode( ResultNode );
	// NOTE: At this point the node may have been reconstructed, depending on node type!

	return ResultNode;
}

UEdGraphNode* FEdGraphSchemaAction_NewNode::CreateNode(class UEdGraph* ParentGraph, UEdGraphPin* FromPin, const FVector2D Location, class UEdGraphNode* NodeTemplate)
{
	// Duplicate template node to create new node
	UEdGraphNode* ResultNode = NULL;

#if WITH_EDITOR
	ResultNode = DuplicateObject<UEdGraphNode>(NodeTemplate, ParentGraph);
	ResultNode->SetFlags(RF_Transactional);

	ParentGraph->AddNode(ResultNode, true);

	ResultNode->CreateNewGuid();
	ResultNode->PostPlacedNewNode();
	ResultNode->AllocateDefaultPins();
	ResultNode->AutowireNewNode(FromPin);

	// For input pins, new node will generally overlap node being dragged off
	// Work out if we want to visually push away from connected node
	int32 XLocation = Location.X;
	if (FromPin && FromPin->Direction == EGPD_Input)
	{
		UEdGraphNode* PinNode = FromPin->GetOwningNode();
		const float XDelta = FMath::Abs(PinNode->NodePosX - Location.X);

		if (XDelta < NodeDistance)
		{
			// Set location to edge of current node minus the max move distance
			// to force node to push off from connect node enough to give selection handle
			XLocation = PinNode->NodePosX - NodeDistance;
		}
	}

	ResultNode->NodePosX = XLocation;
	ResultNode->NodePosY = Location.Y;
	ResultNode->SnapToGrid(SNAP_GRID);
#endif // WITH_EDITOR

	return ResultNode;
}

void FSoundCueEditor::PasteNodesHere(const FVector2D& Location)
{
	// Undo/Redo support
	const FScopedTransaction Transaction( NSLOCTEXT("UnrealEd", "SoundCueEditorPaste", "Paste Sound Cue Node") );
	SoundCue->GetGraph()->Modify();
	SoundCue->Modify();

	// Clear the selection set (newly pasted stuff will be selected)
	SoundCueGraphEditor->ClearSelectionSet();

	// Grab the text to paste from the clipboard.
	FString TextToImport;
	FPlatformMisc::ClipboardPaste(TextToImport);

	// Import the nodes
	TSet<UEdGraphNode*> PastedNodes;
	FEdGraphUtilities::ImportNodesFromText(SoundCue->GetGraph(), TextToImport, /*out*/ PastedNodes);

	//Average position of nodes so we can move them while still maintaining relative distances to each other
	FVector2D AvgNodePosition(0.0f,0.0f);

	for (TSet<UEdGraphNode*>::TIterator It(PastedNodes); It; ++It)
	{
		UEdGraphNode* Node = *It;
		AvgNodePosition.X += Node->NodePosX;
		AvgNodePosition.Y += Node->NodePosY;
	}

	if ( PastedNodes.Num() > 0 )
	{
		float InvNumNodes = 1.0f/float(PastedNodes.Num());
		AvgNodePosition.X *= InvNumNodes;
		AvgNodePosition.Y *= InvNumNodes;
	}

	for (TSet<UEdGraphNode*>::TIterator It(PastedNodes); It; ++It)
	{
		UEdGraphNode* Node = *It;

		if (USoundCueGraphNode* SoundGraphNode = Cast<USoundCueGraphNode>(Node))
		{
			SoundCue->AllNodes.Add(SoundGraphNode->SoundNode);
		}

		// Select the newly pasted stuff
		SoundCueGraphEditor->SetNodeSelection(Node, true);

		Node->NodePosX = (Node->NodePosX - AvgNodePosition.X) + Location.X ;
		Node->NodePosY = (Node->NodePosY - AvgNodePosition.Y) + Location.Y ;

		Node->SnapToGrid(SNodePanel::GetSnapGridSize());

		// Give new node a different Guid from the old one
		Node->CreateNewGuid();
	}

	// Force new pasted SoundNodes to have same connections as graph nodes
	SoundCue->CompileSoundNodesFromGraphNodes();

	// Update UI
	SoundCueGraphEditor->NotifyGraphChanged();

	SoundCue->PostEditChange();
	SoundCue->MarkPackageDirty();
}

void FNiagaraEditor::PasteNodesHere(const FVector2D& Location)
{
	TSharedPtr<SGraphEditor> CurrentGraphEditor = NodeGraphEditorPtr.Pin();
	if (!CurrentGraphEditor.IsValid())
	{
		return;
	}

	// Undo/Redo support
	const FScopedTransaction Transaction(FGenericCommands::Get().Paste->GetDescription());
	UEdGraph* EdGraph = Cast<UEdGraph>(CurrentGraphEditor->GetCurrentGraph());
	EdGraph->Modify();

	const FGraphPanelSelectionSet SelectedNodes = CurrentGraphEditor->GetSelectedNodes();

	// Clear the selection set (newly pasted stuff will be selected)
	CurrentGraphEditor->ClearSelectionSet();

	// Grab the text to paste from the clipboard.
	FString TextToImport;
	FPlatformMisc::ClipboardPaste(TextToImport);

	// Import the nodes
	TSet<UEdGraphNode*> PastedNodes;
	FEdGraphUtilities::ImportNodesFromText(EdGraph, TextToImport, /*out*/ PastedNodes);

	//Average position of nodes so we can move them while still maintaining relative distances to each other
	FVector2D AvgNodePosition(0.0f, 0.0f);

	for (TSet<UEdGraphNode*>::TIterator It(PastedNodes); It; ++It)
	{
		UEdGraphNode* Node = (*It);
		if (Node)
		{
			AvgNodePosition.X += Node->NodePosX;
			AvgNodePosition.Y += Node->NodePosY;
		}
	}

	if (PastedNodes.Num() > 0)
	{
		float InvNumNodes = 1.0f / float(PastedNodes.Num());
		AvgNodePosition.X *= InvNumNodes;
		AvgNodePosition.Y *= InvNumNodes;
	}
	
	for (TSet<UEdGraphNode*>::TIterator It(PastedNodes); It; ++It)
	{
		UEdGraphNode* PasteNode = (*It);
		if (PasteNode)
		{
			// Select the newly pasted stuff
			CurrentGraphEditor->SetNodeSelection(PasteNode, true);

			PasteNode->NodePosX = (PasteNode->NodePosX - AvgNodePosition.X) + Location.X;
			PasteNode->NodePosY = (PasteNode->NodePosY - AvgNodePosition.Y) + Location.Y;

			PasteNode->SnapToGrid(16);

			// Give new node a different Guid from the old one
			PasteNode->CreateNewGuid();
		}
	}


	// Update UI
	CurrentGraphEditor->NotifyGraphChanged();

	UObject* GraphOwner = EdGraph->GetOuter();
	if (GraphOwner)
	{
		GraphOwner->PostEditChange();
		GraphOwner->MarkPackageDirty();
	}
}