ParameterSourcesFloat.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "BaseGizmos/GizmoInterfaces.h"
#include "CoreMinimal.h"
#include "Delegates/Delegate.h"
#include "Misc/AssertionMacros.h"
#include "UObject/Object.h"
#include "UObject/ObjectMacros.h"
#include "UObject/UObjectGlobals.h"
 
#include "ParameterSourcesFloat.generated.h"
 
USTRUCT()
struct FGizmoFloatParameterChange
{
    GENERATED_BODY()
 
    UPROPERTY()
    float InitialValue = 0;
 
    UPROPERTY()
    float CurrentValue = 0;
 
 
    float GetChangeDelta() const
    {
        return CurrentValue - InitialValue;
    }
 
    explicit FGizmoFloatParameterChange(float StartValue = 0)
    {
        InitialValue = CurrentValue = StartValue;
    }
};
 
 
UCLASS(MinimalAPI)
class UGizmoBaseFloatParameterSource : public UObject, public IGizmoFloatParameterSource
{
    GENERATED_BODY()
public:
    virtual float GetParameter() const
    {
        check(false);    // this is an abstract base class
        return 0.0f;
    }
 
    virtual void SetParameter(float NewValue)
    {
        check(false);    // this is an abstract base class
    }
 
 
    virtual void BeginModify()
    {
    }
 
    virtual void EndModify()
    {
    }
 
 
public:
    DECLARE_MULTICAST_DELEGATE_TwoParams(FOnGizmoFloatParameterSourceChanged, IGizmoFloatParameterSource*, FGizmoFloatParameterChange);
    FOnGizmoFloatParameterSourceChanged OnParameterChanged;
};
 
 
 
UCLASS(MinimalAPI)
class UGizmoLocalFloatParameterSource : public UGizmoBaseFloatParameterSource
{
    GENERATED_BODY()
public:
    virtual float GetParameter() const override
    {
        return Value;
    }
 
    virtual void SetParameter(float NewValue) override
    {
        Value = NewValue;
        LastChange.CurrentValue = NewValue;
        OnParameterChanged.Broadcast(this, LastChange);
    }
 
    virtual void BeginModify()
    {
        LastChange = FGizmoFloatParameterChange(Value);
    }
 
    virtual void EndModify()
    {
    }
 
 
public:
 
    UPROPERTY()
    float Value = 0.0f;
 
    UPROPERTY()
    FGizmoFloatParameterChange LastChange;
};