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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]
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "Containers/Array.h"
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#include "Containers/UnrealString.h"
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#include "GraphEditorDragDropAction.h"
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#include "Input/DragAndDrop.h"
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#include "Input/Reply.h"
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#include "Math/Vector2D.h"
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#include "SGraphPin.h"
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#include "Templates/SharedPointer.h"
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class SGraphPanel;
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class SWidget;
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class UEdGraph;
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class UEdGraphPin;
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struct FPointerEvent;
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class FDragConnection : public FGraphEditorDragDropAction
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{
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public:
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DRAG_DROP_OPERATOR_TYPE(FDragConnection, FGraphEditorDragDropAction)
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enum EDragMode : uint8
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{
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CreateConnection = 0,
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RelinkConnection
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};
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typedef TArray<FGraphPinHandle> FDraggedPinTable;
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static TSharedRef<FDragConnection> New(const TSharedRef<SGraphPanel>& InGraphPanel, const FDraggedPinTable& InStartingPins);
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// FDragDropOperation interface
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virtual void OnDrop( bool bDropWasHandled, const FPointerEvent& MouseEvent ) override;
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// End of FDragDropOperation interface
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// FGraphEditorDragDropAction interface
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virtual void HoverTargetChanged() override;
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virtual FReply DroppedOnPin(FVector2D ScreenPosition, FVector2D GraphPosition) override;
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virtual FReply DroppedOnNode(FVector2D ScreenPosition, FVector2D GraphPosition) override;
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virtual FReply DroppedOnPanel(const TSharedRef< SWidget >& Panel, FVector2D ScreenPosition, FVector2D GraphPosition, UEdGraph& Graph) override;
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virtual void OnDragged(const class FDragDropEvent& DragDropEvent) override;
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// End of FGraphEditorDragDropAction interface
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/*
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* Function to check validity of graph pins in the StartPins list. This check helps to prevent processing graph pins which are outdated.
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*/
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virtual void ValidateGraphPinList(TArray<UEdGraphPin*>& OutValidPins);
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protected:
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typedef FGraphEditorDragDropAction Super;
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// Constructor: Make sure to call Construct() after factorying one of these
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FDragConnection(const TSharedRef<SGraphPanel>& GraphPanel, const FDraggedPinTable& DraggedPins);
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protected:
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TSharedPtr<SGraphPanel> GraphPanel;
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FDraggedPinTable DraggingPins;
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EDragMode DragMode = EDragMode::CreateConnection;
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/** Offset information for the decorator widget */
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FVector2D DecoratorAdjust;
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FGraphPinHandle SourcePinHandle;
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FGraphPinHandle TargetPinHandle;
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};
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