123 lines
4.7 KiB
Markdown
123 lines
4.7 KiB
Markdown
---
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title: Untitled
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date: 2024-01-29 13:23:24
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excerpt:
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tags:
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rating: ⭐
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---
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# 前言
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相关函数主要为：
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- AbilitySystemComponent->BindToInputComponent()：只绑定名称为AbilityConfirm与AbilityCancel的InputAction。
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- AbilitySystemComponent->BindAbilityActivationToInputComponent()：输入InputComponent、FGameplayAbilityInputBinds、FTopLevelAssetPath（枚举类路径）、枚举ID，之后绑定GA与Input。
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- AbilitySystemComponent->SetBlockAbilityBindingsArray()：设置Block列表。
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# GAS
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BindAbilityActivationToInputComponent()的绑定方式如果ASC在Character中，可以在SetupPlayerInputComponent()中进行绑定：
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```c
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// Bind to AbilitySystemComponent
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FTopLevelAssetPath AbilityEnumAssetPath = FTopLevelAssetPath(FName("/Script/GASDocumentation"), FName("EGDAbilityInputID"));
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AbilitySystemComponent->BindAbilityActivationToInputComponent(PlayerInputComponent, FGameplayAbilityInputBinds(FString("ConfirmTarget"),
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FString("CancelTarget"), AbilityEnumAssetPath, static_cast<int32>(EGDAbilityInputID::Confirm), static_cast<int32>(EGDAbilityInputID::Cancel)));
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```
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其内部主要是类似这样的方式进行绑定：
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```c++
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// Pressed event
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{
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FInputActionBinding AB(FName(*FullStr), IE_Pressed);
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AB.ActionDelegate.GetDelegateForManualSet().BindUObject(this, &UAbilitySystemComponent::AbilityLocalInputPressed, idx);
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InputComponent->AddActionBinding(AB);
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}
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// Released event
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{
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FInputActionBinding AB(FName(*FullStr), IE_Released);
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AB.ActionDelegate.GetDelegateForManualSet().BindUObject(this, &UAbilitySystemComponent::AbilityLocalInputReleased, idx);
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InputComponent->AddActionBinding(AB);
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}
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```
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AbilityLocalInputPressed()与AbilityLocalInputReleased()会执行：
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1. 触发多播委托
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2. TryActivateAbility() 或者 AbilitySpecInputPressed()。
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感觉可以自己实现一个BindAbilityActivationToInputComponent()的绑定逻辑，ASC自带的逻辑有点2。
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GAS使用的是**InputComponent->AddActionBinding**，而增强输入使用**PlayerEnhancedInputComponent->BindAction**。本质是一样的。
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```c++
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FInputActionBinding& BindAction( const FName ActionName, const EInputEvent KeyEvent, UserClass* Object, typename FInputActionHandlerSignature::TMethodPtr< UserClass > Func )
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{
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FInputActionBinding AB( ActionName, KeyEvent );
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AB.ActionDelegate.BindDelegate(Object, Func);
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return AddActionBinding(MoveTemp(AB));
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}
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```
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## 绑定输入而不激活能力
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如果您不希望`GameplayAbilities`在按下输入时自动激活，但仍将它们绑定到输入以与 一起使用`AbilityTasks`，则可以向您的`UGameplayAbility`子类添加一个新的 bool 变量`bActivateOnInput`，该变量默认为`true`并覆盖`UAbilitySystemComponent::AbilityLocalInputPressed()`。
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```c
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void UGSAbilitySystemComponent::AbilityLocalInputPressed(int32 InputID)
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{
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// Consume the input if this InputID is overloaded with GenericConfirm/Cancel and the GenericConfim/Cancel callback is bound
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if (IsGenericConfirmInputBound(InputID))
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{
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LocalInputConfirm();
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return;
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}
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if (IsGenericCancelInputBound(InputID))
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{
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LocalInputCancel();
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return;
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}
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// ---------------------------------------------------------
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ABILITYLIST_SCOPE_LOCK();
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for (FGameplayAbilitySpec& Spec : ActivatableAbilities.Items)
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{
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if (Spec.InputID == InputID)
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{
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if (Spec.Ability)
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{
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Spec.InputPressed = true;
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if (Spec.IsActive())
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{
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if (Spec.Ability->bReplicateInputDirectly && IsOwnerActorAuthoritative() == false)
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{
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ServerSetInputPressed(Spec.Handle);
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}
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AbilitySpecInputPressed(Spec);
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// Invoke the InputPressed event. This is not replicated here. If someone is listening, they may replicate the InputPressed event to the server.
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InvokeReplicatedEvent(EAbilityGenericReplicatedEvent::InputPressed, Spec.Handle, Spec.ActivationInfo.GetActivationPredictionKey());
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}
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else
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{
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UGSGameplayAbility* GA = Cast<UGSGameplayAbility>(Spec.Ability);
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if (GA && GA->bActivateOnInput)
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{
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// Ability is not active, so try to activate it
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TryActivateAbility(Spec.Handle);
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}
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}
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}
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}
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}
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}
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```
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# SDHGame
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李兄是在状态机每个节点的StateBegin()中调用CreateDynamicSkillInputActionMappingContext()进行动态绑定的。FSDHSkillInputActionBinding里包含FEnhancedActionKeyMapping相关数据。
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```c++
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void USDHSMStateIns::OutputActionKeyMapping(TArray<FEnhancedActionKeyMapping>& OutBindings, const TArray<FSDHSkillInputActionBinding>& InputSkillBinding)
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{
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for (int32 i = 0; i < InputSkillBinding.Num(); i++)
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{
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FEnhancedActionKeyMapping NewMapping;
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NewMapping.Key = InputSkillBinding[i].Key;
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NewMapping.Action = InputSkillBinding[i].Action;
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OutBindings.Add(MoveTemp(NewMapping));
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}
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}
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``` |