RSAsyncWatchAttribute.h

GAS Helpers v0.2.0 · 46 lines · C++ · MIT license

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1	// Copyright (c) 2026 Reignance Studios. MIT License, see LICENSE.
2
3	#pragma once
4
5	#include "CoreMinimal.h"
6	#include "Engine/CancellableAsyncAction.h"
7	#include "AttributeSet.h"
8	#include "GameplayEffectTypes.h"
9	#include "RSAsyncWatchAttribute.generated.h"
10
11	class UAbilitySystemComponent;
12
13	DECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FRSAttributeChanged, FGameplayAttribute, Attribute, float, NewValue, float, OldValue);
14
15	/**
16	* Watches one or more attributes and fires OnChanged when any of them changes.
17	* Fires once right away with the current value, so a widget can bind in
18	* Construct and never poll in Tick. Works on clients: attribute replication
19	* runs the same change delegate.
20	*
21	* Call Cancel (or let the widget's Destruct call it) to unbind.
22	*/
23	UCLASS(meta = (ExposedAsyncProxy = "AsyncTask"))
24	class RSGASHELPERS_API URSAsyncWatchAttribute : public UCancellableAsyncAction
25	{
26	GENERATED_BODY()
27
28	public:
29	UPROPERTY(BlueprintAssignable)
30	FRSAttributeChanged OnChanged;
31
32	/** Watch attributes on the actor's ASC (PlayerState setups included). */
33	UFUNCTION(BlueprintCallable, Category = "RS\|GAS", meta = (BlueprintInternalUseOnly = "true", DefaultToSelf = "Actor"))
34	static URSAsyncWatchAttribute* WatchAttributes(AActor* Actor, const TArray<FGameplayAttribute>& Attributes, bool bFireInitialValue = true);
35
36	virtual void Activate() override;
37	virtual void Cancel() override;
38
39	private:
40	void HandleChange(const FOnAttributeChangeData& Data);
41
42	TWeakObjectPtr<UAbilitySystemComponent> WeakASC;
43	TArray<FGameplayAttribute> Watched;
44	TArray<TPair<FGameplayAttribute, FDelegateHandle>> Bindings;
45	bool bFireInitial = true;
46	};

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