vault backup: 2024-10-12 17:19:45

03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Blueprint/Param/HideSpawnParms/HideSpawnParms.md

@@ -0,0 +1,41 @@
+# HideSpawnParms
+
+- **功能描述：** 在UGamelayTask子类生成的蓝图异步节点上隐藏UGamelayTask子类继承链中某些属性。
+- **使用位置：** UFUNCTION
+- **元数据类型：** strings="a，b，c"
+- **关联项：** [ExposedAsyncProxy](../../ExposedAsyncProxy/ExposedAsyncProxy.md)
+
+在UGamelayTask子类生成的蓝图异步节点上隐藏UGamelayTask子类继承链中某些属性。
+
+HideSpawnParms 只在UK2Node_LatentGameplayTaskCall中判断，因此只作用于UGameplayTask的子类。在源码中找到的唯一用法是 HideSpawnParms = "Instigator”，但是其UGamelayTask子类继承链中并无该属性，因此其实是不发挥作用的。
+
+```cpp
+	UFUNCTION(BlueprintCallable, Meta = (HidePin = "OwningAbility", DefaultToSelf = "OwningAbility", BlueprintInternalUseOnly = "true", HideSpawnParms = "Instigator"), Category = "Ability|Tasks")
+	static UAbilityTask_StartAbilityState* StartAbilityState(UGameplayAbility* OwningAbility, FName StateName, bool bEndCurrentState = true);
+```
+
+保留和去掉HideSpawnParms 的蓝图的节点都为：
+
+![Untitled](Untitled.png)
+
+## 源码里发生的位置：
+
+```cpp
+void UK2Node_LatentGameplayTaskCall::CreatePinsForClass(UClass* InClass)
+{
+	// Tasks can hide spawn parameters by doing meta = (HideSpawnParms="PropertyA,PropertyB")
+	// (For example, hide Instigator in situations where instigator is not relevant to your task)
+
+	TArray<FString> IgnorePropertyList;
+	{
+		UFunction* ProxyFunction = ProxyFactoryClass->FindFunctionByName(ProxyFactoryFunctionName);
+	
+		const FString& IgnorePropertyListStr = ProxyFunction->GetMetaData(FName(TEXT("HideSpawnParms")));
+	
+		if (!IgnorePropertyListStr.IsEmpty())
+		{
+			IgnorePropertyListStr.ParseIntoArray(IgnorePropertyList, TEXT(","), true);
+		}
+	}
+}
+```