ParameterSourcesVec2.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "BaseGizmos/GizmoInterfaces.h"
#include "ParameterSourcesVec2.generated.h"
 
//
// various implementations of IGizmoVec2ParameterSource
// 
 
 
USTRUCT()
struct FGizmoVec2ParameterChange
{
    GENERATED_BODY()
 
    UPROPERTY()
    FVector2D InitialValue = FVector2D::ZeroVector;
 
    UPROPERTY()
    FVector2D CurrentValue = FVector2D::ZeroVector;
 
 
    FVector2D GetChangeDelta() const
    {
        return CurrentValue - InitialValue;
    }
 
    explicit FGizmoVec2ParameterChange(const FVector2D& StartValue = FVector2D::ZeroVector)
    {
        InitialValue = CurrentValue = StartValue;
    }
};
 
 
 
UCLASS(MinimalAPI)
class UGizmoBaseVec2ParameterSource : public UObject, public IGizmoVec2ParameterSource
{
    GENERATED_BODY()
public:
    virtual FVector2D GetParameter() const
    {
        check(false);    // this is an abstract base class
        return FVector2D::ZeroVector;
    }
 
    virtual void SetParameter(const FVector2D& NewValue)
    {
        check(false);    // this is an abstract base class
    }
 
 
    virtual void BeginModify()
    {
    }
 
    virtual void EndModify()
    {
    }
 
 
public:
    DECLARE_MULTICAST_DELEGATE_TwoParams(FOnGizmoVec2ParameterSourceChanged, IGizmoVec2ParameterSource*, FGizmoVec2ParameterChange);
    FOnGizmoVec2ParameterSourceChanged OnParameterChanged;
};
 
 
 
UCLASS(MinimalAPI)
class UGizmoLocalVec2ParameterSource : public UGizmoBaseVec2ParameterSource
{
    GENERATED_BODY()
public:
    virtual FVector2D GetParameter() const override
    {
        return Value;
    }
 
    virtual void SetParameter(const FVector2D& NewValue) override
    {
        Value = NewValue;
        LastChange.CurrentValue = NewValue;
        OnParameterChanged.Broadcast(this, LastChange);
    }
 
    virtual void BeginModify()
    {
        LastChange = FGizmoVec2ParameterChange(Value);
    }
 
    virtual void EndModify()
    {
    }
 
 
public:
 
    UPROPERTY()
    FVector2D Value = FVector2D::ZeroVector;
 
    UPROPERTY()
    FGizmoVec2ParameterChange LastChange;
};