123 lines
2.5 KiB
C++
123 lines
2.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "BaseGizmos/GizmoInterfaces.h"
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#include "ParameterSourcesVec2.generated.h"
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//
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// various implementations of IGizmoVec2ParameterSource
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//
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/**
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* FGizmoVec2ParameterChange represents a change in the value of an IGizmoVec2ParameterSource.
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* IGizmoVec2ParameterSource implementations use this to track changes and emit delta information.
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*/
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USTRUCT()
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struct FGizmoVec2ParameterChange
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{
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GENERATED_BODY()
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UPROPERTY()
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FVector2D InitialValue = FVector2D::ZeroVector;
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UPROPERTY()
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FVector2D CurrentValue = FVector2D::ZeroVector;
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FVector2D GetChangeDelta() const
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{
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return CurrentValue - InitialValue;
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}
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explicit FGizmoVec2ParameterChange(const FVector2D& StartValue = FVector2D::ZeroVector)
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{
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InitialValue = CurrentValue = StartValue;
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}
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};
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/**
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* UGizmoBaseVec2ParameterSource is a base implementation of IGizmoVec2ParameterSource,
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* which is not functional but adds an OnParameterChanged delegate for further subclasses.
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*/
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UCLASS(MinimalAPI)
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class UGizmoBaseVec2ParameterSource : public UObject, public IGizmoVec2ParameterSource
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{
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GENERATED_BODY()
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public:
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virtual FVector2D GetParameter() const
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{
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check(false); // this is an abstract base class
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return FVector2D::ZeroVector;
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}
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virtual void SetParameter(const FVector2D& NewValue)
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{
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check(false); // this is an abstract base class
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}
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virtual void BeginModify()
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{
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}
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virtual void EndModify()
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{
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}
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public:
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DECLARE_MULTICAST_DELEGATE_TwoParams(FOnGizmoVec2ParameterSourceChanged, IGizmoVec2ParameterSource*, FGizmoVec2ParameterChange);
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FOnGizmoVec2ParameterSourceChanged OnParameterChanged;
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};
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/**
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* UGizmoBaseVec2ParameterSource is an implementation of IGizmoVec2ParameterSource
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* (by way of UGizmoBaseVec2ParameterSource) which locally stores the relevant Parameter
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* and emits update events via the OnParameterChanged delegate.
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*/
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UCLASS(MinimalAPI)
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class UGizmoLocalVec2ParameterSource : public UGizmoBaseVec2ParameterSource
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{
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GENERATED_BODY()
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public:
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virtual FVector2D GetParameter() const override
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{
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return Value;
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}
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virtual void SetParameter(const FVector2D& NewValue) override
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{
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Value = NewValue;
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LastChange.CurrentValue = NewValue;
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OnParameterChanged.Broadcast(this, LastChange);
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}
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virtual void BeginModify()
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{
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LastChange = FGizmoVec2ParameterChange(Value);
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}
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virtual void EndModify()
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{
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}
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public:
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UPROPERTY()
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FVector2D Value = FVector2D::ZeroVector;
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UPROPERTY()
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FGizmoVec2ParameterChange LastChange;
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};
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