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[UE-168360] User can create a transition from a state into the entry state * Relinking multiple transitions (transition nodes at once) when none of the transition nodes is selected. * Selective relinking in case a subset of the transition nodes on a transitions are selected. * Special case handling for transitions from entry state (they don't have a transition node connected). * Drawing circle indicator around the arrow head in case the mouse cursor is approaching the transition. * Hovering the arrow head of a transition highlights it by filling the circle with solid orange color and turning the arrow black. * Ending the relink operation in empty space or the entry node will cancel the relink operation. * Fixed bug that prevents creating new transitions ending in an entry state. #jira https://jira.it.epicgames.com/browse/UE-136096 #jira https://jira.it.epicgames.com/browse/UE-168360 #preflight 636a169963037c10262bc421 [CL 23025287 by benjamin jillich in ue5-main branch]
63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "ConnectionDrawingPolicy.h"
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#include "Containers/Map.h"
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#include "HAL/Platform.h"
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#include "Math/Vector2D.h"
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#include "Templates/SharedPointer.h"
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class FArrangedChildren;
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class FArrangedWidget;
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class FSlateRect;
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class FSlateWindowElementList;
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class SWidget;
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class UEdGraph;
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class UEdGraphNode;
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class UEdGraphPin;
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struct FGeometry;
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/////////////////////////////////////////////////////
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// FStateMachineConnectionDrawingPolicy
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// This class draws the connections for an UEdGraph with a state machine schema
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class FStateMachineConnectionDrawingPolicy : public FConnectionDrawingPolicy
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{
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protected:
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UEdGraph* GraphObj;
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TMap<UEdGraphNode*, int32> NodeWidgetMap;
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public:
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// @Note FConnectionParams.bUserFlag2: Is used here to indicate whether the drawn arrow is a preview transition or a real one.
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//
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FStateMachineConnectionDrawingPolicy(int32 InBackLayerID, int32 InFrontLayerID, float ZoomFactor, const FSlateRect& InClippingRect, FSlateWindowElementList& InDrawElements, UEdGraph* InGraphObj);
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// FConnectionDrawingPolicy interface
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virtual void DetermineWiringStyle(UEdGraphPin* OutputPin, UEdGraphPin* InputPin, /*inout*/ FConnectionParams& Params) override;
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virtual void Draw(TMap<TSharedRef<SWidget>, FArrangedWidget>& PinGeometries, FArrangedChildren& ArrangedNodes) override;
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virtual void DetermineLinkGeometry(
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FArrangedChildren& ArrangedNodes,
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TSharedRef<SWidget>& OutputPinWidget,
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UEdGraphPin* OutputPin,
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UEdGraphPin* InputPin,
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/*out*/ FArrangedWidget*& StartWidgetGeometry,
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/*out*/ FArrangedWidget*& EndWidgetGeometry
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) override;
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virtual void DrawSplineWithArrow(const FGeometry& StartGeom, const FGeometry& EndGeom, const FConnectionParams& Params) override;
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virtual void DrawSplineWithArrow(const FVector2D& StartPoint, const FVector2D& EndPoint, const FConnectionParams& Params) override;
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virtual void DrawPreviewConnector(const FGeometry& PinGeometry, const FVector2D& StartPoint, const FVector2D& EndPoint, UEdGraphPin* Pin) override;
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virtual FVector2D ComputeSplineTangent(const FVector2D& Start, const FVector2D& End) const override;
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// End of FConnectionDrawingPolicy interface
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protected:
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void Internal_DrawLineWithArrow(const FVector2D& StartAnchorPoint, const FVector2D& EndAnchorPoint, const FConnectionParams& Params);
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// Draw line-based circle (no solid filling)
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void DrawCircle(const FVector2D& Center, float Radius, const FLinearColor& Color, const int NumLineSegments);
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TArray<FVector2D> TempPoints;
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static constexpr float RelinkHandleHoverRadius = 20.0f;
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};
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