UE4 c++类派生蓝图类

最新推荐文章于 2023-11-22 13:58:02 发布

原创最新推荐文章于 2023-11-22 13:58:02 发布 · 1k 阅读

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#UE4文档学习

本文详细解析了在Unreal引擎中如何通过C++实现蓝图类的自定义属性计算，展示了如何使蓝图在编辑时响应属性改变并即时更新计算结果。通过具体代码示例，介绍了AMyActor类的实现，包括属性设置、函数调用以及在编辑器中响应属性变化的方法。

先列代码

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "GameFramework/Actor.h"
#include "MyActor.generated.h"

UCLASS()
class TESTUNREALC_API AMyActor : public AActor
{
GENERATED_BODY()

public:
// Sets default values for this actor's properties
AMyActor();

UPROPERTY(EditAnywhere, BlueprintReadWrite,Category = "Damage")
int32 TotalDamage;

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Damage")
float DamageTimeInSeconds;

UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Transient, Category = "Damage")
float DamagePerSecond;

UFUNCTION(BlueprintCallable, Category = "Damage")
void CalculateValues();

UFUNCTION(BlueprintImplementableEvent, Category = "DAMAGE")
void CalledFromCpp();

void CalledFromCpp_Implementation();
// Called when the game starts or when spawned
virtual void BeginPlay() override;

// Called every frame
virtual void Tick( float DeltaSeconds ) override;

virtual void PostInitProperties() override;

virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;

};

// Fill out your copyright notice in the Description page of Project Settings.

#include "testunrealc.h"
#include "MyActor.h"

// Sets default values
AMyActor::AMyActor()
{
// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = true;
TotalDamage = 200;
DamageTimeInSeconds = 1.0f;
DamagePerSecond = TotalDamage / DamageTimeInSeconds;

}

// Called when the game starts or when spawned
void AMyActor::BeginPlay()
{
Super::BeginPlay();

}

// Called every frame
void AMyActor::Tick( float DeltaTime )
{
Super::Tick( DeltaTime );

}

void AMyActor::PostInitProperties()
{
Super::PostInitProperties();
this->CalculateValues();
}

void AMyActor::CalculateValues()
{
DamagePerSecond = TotalDamage / DamageTimeInSeconds;
}

#if WITH_EDITOR
void AMyActor::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
this->CalculateValues();
Super::PostEditChangeProperty(PropertyChangedEvent);
}
#endif

void AMyActor::CalledFromCpp_Implementation()
{

}

从此类中派生出两个蓝图类，其中一个蓝图类在编辑框的值能够随着输入值的变化而变化，一个不能随时计算

原因在于

void AMyActor::PostInitProperties()
{
Super::PostInitProperties();
this->CalculateValues();
}

#if WITH_EDITOR
void AMyActor::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
this->CalculateValues();
Super::PostEditChangeProperty(PropertyChangedEvent);
}
#endif