void FGraphEditorDragDropAction::SetSimpleFeedbackMessage(const FSlateBrush* Icon, const FSlateColor& IconColor, const FText& Message)
{
// Let the user know the status of making this connection.
// Use CreateRaw as we cannot using anything that will create a shared ptr from within an objects construction, this should be
// safe though as we will destroy our window before we get destroyed.
TAttribute<EVisibility> ErrorIconVisibility = TAttribute<EVisibility>::Create(TAttribute<EVisibility>::FGetter::CreateRaw(this, &FGraphEditorDragDropAction::GetErrorIconVisible));
TAttribute<EVisibility> IconVisibility = TAttribute<EVisibility>::Create(TAttribute<EVisibility>::FGetter::CreateRaw(this, &FGraphEditorDragDropAction::GetIconVisible));
SetFeedbackMessage(
SNew(SHorizontalBox)
+SHorizontalBox::Slot()
.AutoWidth()
.Padding(3.0f)
[
SNew(SScaleBox)
.Stretch(EStretch::ScaleToFit)
[
SNew(SImage)
.Visibility(ErrorIconVisibility)
.Image( FEditorStyle::GetBrush( TEXT("Graph.ConnectorFeedback.Error") ))
.ColorAndOpacity( FLinearColor::White )
]
]
+SHorizontalBox::Slot()
.AutoWidth()
.Padding(3.0f)
[
SNew(SScaleBox)
.Stretch(EStretch::ScaleToFit)
[
SNew(SImage)
.Visibility(IconVisibility)
.Image( Icon )
.ColorAndOpacity( IconColor )
]
]
+SHorizontalBox::Slot()
.AutoWidth()
.MaxWidth(500)
.VAlign(VAlign_Center)
[
SNew(STextBlock)
.WrapTextAt( 480 )
.Text( Message )
]
);
}
void FDragConnection::HoverTargetChanged()
{
TArray<FPinConnectionResponse> UniqueMessages;
if (UEdGraphPin* TargetPinObj = GetHoveredPin())
{
TArray<UEdGraphPin*> ValidSourcePins;
ValidateGraphPinList(/*out*/ ValidSourcePins);
// Check the schema for connection responses
for (UEdGraphPin* StartingPinObj : ValidSourcePins)
{
if (TargetPinObj != StartingPinObj)
{
// The Graph object in which the pins reside.
UEdGraph* GraphObj = StartingPinObj->GetOwningNode()->GetGraph();
// Determine what the schema thinks about the wiring action
const FPinConnectionResponse Response = GraphObj->GetSchema()->CanCreateConnection( StartingPinObj, TargetPinObj );
if (Response.Response == ECanCreateConnectionResponse::CONNECT_RESPONSE_DISALLOW)
{
TSharedPtr<SGraphNode> NodeWidget = TargetPinObj->GetOwningNode()->NodeWidget.Pin();
if (NodeWidget.IsValid())
{
NodeWidget->NotifyDisallowedPinConnection(StartingPinObj, TargetPinObj);
}
}
UniqueMessages.AddUnique(Response);
}
}
}
else if(UEdGraphNode* TargetNodeObj = GetHoveredNode())
{
TArray<UEdGraphPin*> ValidSourcePins;
ValidateGraphPinList(/*out*/ ValidSourcePins);
// Check the schema for connection responses
for (UEdGraphPin* StartingPinObj : ValidSourcePins)
{
FPinConnectionResponse Response;
FText ResponseText;
if (StartingPinObj->GetOwningNode() != TargetNodeObj && StartingPinObj->GetSchema()->SupportsDropPinOnNode(TargetNodeObj, StartingPinObj->PinType, StartingPinObj->Direction, ResponseText))
{
Response.Response = ECanCreateConnectionResponse::CONNECT_RESPONSE_MAKE;
}
else
{
Response.Response = ECanCreateConnectionResponse::CONNECT_RESPONSE_DISALLOW;
}
// Do not display an error if there is no message
if (!ResponseText.IsEmpty())
{
Response.Message = ResponseText;
UniqueMessages.AddUnique(Response);
}
}
}
// Let the user know the status of dropping now
if (UniqueMessages.Num() == 0)
{
// Display the place a new node icon, we're not over a valid pin
SetSimpleFeedbackMessage(
FEditorStyle::GetBrush(TEXT("Graph.ConnectorFeedback.NewNode")),
FLinearColor::White,
NSLOCTEXT("GraphEditor.Feedback", "PlaceNewNode", "Place a new node."));
}
else
{
// Take the unique responses and create visual feedback for it
TSharedRef<SVerticalBox> FeedbackBox = SNew(SVerticalBox);
for (auto ResponseIt = UniqueMessages.CreateConstIterator(); ResponseIt; ++ResponseIt)
{
// Determine the icon
const FSlateBrush* StatusSymbol = NULL;
switch (ResponseIt->Response)
{
case CONNECT_RESPONSE_MAKE:
case CONNECT_RESPONSE_BREAK_OTHERS_A:
case CONNECT_RESPONSE_BREAK_OTHERS_B:
case CONNECT_RESPONSE_BREAK_OTHERS_AB:
StatusSymbol = FEditorStyle::GetBrush(TEXT("Graph.ConnectorFeedback.OK"));
break;
case CONNECT_RESPONSE_MAKE_WITH_CONVERSION_NODE:
StatusSymbol = FEditorStyle::GetBrush(TEXT("Graph.ConnectorFeedback.ViaCast"));
break;
case CONNECT_RESPONSE_DISALLOW:
default:
StatusSymbol = FEditorStyle::GetBrush(TEXT("Graph.ConnectorFeedback.Error"));
break;
}
// Add a new message row
FeedbackBox->AddSlot()
.AutoHeight()
[
SNew(SHorizontalBox)
+SHorizontalBox::Slot()
.AutoWidth()
.Padding(3.0f)
[
SNew(SImage) .Image( StatusSymbol )
]
+SHorizontalBox::Slot()
.AutoWidth()
.VAlign(VAlign_Center)
[
SNew(STextBlock) .Text( ResponseIt->Message )
]
];
}
SetFeedbackMessage(FeedbackBox);
}
}