ActionRPG-1-RPGAbilitySystemComponent

技能系统组件(AbilitySystemComponent)是整个GAS的核心，用于管理各种技能和处理技能系统的所有交互

该组件附加在需要拥有技能的角色上，并可以把技能赋予角色

 

#pragma once

#include "ActionRPG.h"
#include "AbilitySystemComponent.h"
#include "Abilities/RPGAbilityTypes.h"
#include "RPGAbilitySystemComponent.generated.h"

class URPGGameplayAbility;

/**
 * Subclass of ability system component with game-specific data
 * Most games will need to make a game-specific subclass to provide utility functions
 */
UCLASS()
class ACTIONRPG_API URPGAbilitySystemComponent : public UAbilitySystemComponent
{
	GENERATED_BODY()

public:
	// Constructors and overrides
	URPGAbilitySystemComponent();
    
    /**
     * @brief Returns a list of currently active ability instances that match the tags
     * @brief 返回与标记匹配的当前活动能力实例的列表
     * @param GameplayTagContainer 
     * @param ActiveAbilities
     */
	void GetActiveAbilitiesWithTags(const FGameplayTagContainer& GameplayTagContainer, TArray<URPGGameplayAbility*>& ActiveAbilities);
    
	/**
     * @brief Returns the default level used for ability activations, derived from the character
     * @brief 返回用于从角色派生的能力激活的默认级别
     */
	int32 GetDefaultAbilityLevel() const;
    
	/**
     * @brief Version of function in AbilitySystemGlobals that returns correct type
     * @brief AbilitySystemGlobals中返回正确类型的函数的版本
     */
	static URPGAbilitySystemComponent* GetAbilitySystemComponentFromActor(const AActor* Actor, bool LookForComponent = false);

};

 

#include "Abilities/RPGAbilitySystemComponent.h"
#include "RPGCharacterBase.h"
#include "Abilities/RPGGameplayAbility.h"
#include "AbilitySystemGlobals.h"

URPGAbilitySystemComponent::URPGAbilitySystemComponent() {}

void URPGAbilitySystemComponent::GetActiveAbilitiesWithTags(const FGameplayTagContainer& GameplayTagContainer, TArray<URPGGameplayAbility*>& ActiveAbilities) {
	TArray<FGameplayAbilitySpec*> AbilitiesToActivate;
    // 通过匹配标签获取可激活的GA列表。第一个参数表示协议匹配的标签契合，第二个参数表示函数输出的结果，第三个参数表示知否只查找已激活的GA
	GetActivatableGameplayAbilitySpecsByAllMatchingTags(GameplayTagContainer, AbilitiesToActivate, false);

	// Iterate the list of all ability specs
	for (FGameplayAbilitySpec* Spec : AbilitiesToActivate) {
		// Iterate all instances on this ability spec
		TArray<UGameplayAbility*> AbilityInstances = Spec->GetAbilityInstances();
        for (UGameplayAbility* ActiveAbility : AbilityInstances) {
			ActiveAbilities.Add(Cast<URPGGameplayAbility>(ActiveAbility));
		}
	}
}

int32 URPGAbilitySystemComponent::GetDefaultAbilityLevel() const {
	ARPGCharacterBase* OwningCharacter = Cast<ARPGCharacterBase>(GetOwnerActor());

	if (OwningCharacter) {
		return OwningCharacter->GetCharacterLevel();
	}
	return 1;
}

URPGAbilitySystemComponent* URPGAbilitySystemComponent::GetAbilitySystemComponentFromActor(const AActor* Actor, bool LookForComponent) {
	return Cast<URPGAbilitySystemComponent>(UAbilitySystemGlobals::GetAbilitySystemComponentFromActor(Actor, LookForComponent));
}