75 lines
3.3 KiB
Markdown
75 lines
3.3 KiB
Markdown
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# KismetHideOverrides
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- **功能描述：** 不允许被覆盖的蓝图事件的列表。
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- **使用位置：** UCLASS
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- **引擎模块：** Blueprint
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- **元数据类型：** strings="a，b，c"
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在源码中发现ALevelScriptActor上面定义了很多，用来阻止被覆盖。
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## 样例：
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```cpp
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UCLASS(notplaceable, meta=(ChildCanTick, KismetHideOverrides = "ReceiveAnyDamage,ReceivePointDamage,ReceiveRadialDamage,ReceiveActorBeginOverlap,ReceiveActorEndOverlap,ReceiveHit,ReceiveDestroyed,ReceiveActorBeginCursorOver,ReceiveActorEndCursorOver,ReceiveActorOnClicked,ReceiveActorOnReleased,ReceiveActorOnInputTouchBegin,ReceiveActorOnInputTouchEnd,ReceiveActorOnInputTouchEnter,ReceiveActorOnInputTouchLeave"), HideCategories=(Collision,Rendering,Transformation), MinimalAPI)
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class ALevelScriptActor : public AActor
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{}
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```
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但是实际在LevelScriptActor的子类中依然可以覆盖该事件。有一些被隐藏的Event是其实通过HideCategories来做到的。因此该Meta其实并没有实现，如果要达到该效果，还是要通过HideFunctions或HideCategories来达成。
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## 原理：
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可以看到这里面的判断，并没有用到该Meta
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```cpp
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void SMyBlueprint::CollectAllActions(FGraphActionListBuilderBase& OutAllActions)
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{
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// Cache potentially overridable functions
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UClass* ParentClass = BlueprintObj->SkeletonGeneratedClass ? BlueprintObj->SkeletonGeneratedClass->GetSuperClass() : *BlueprintObj->ParentClass;
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for ( TFieldIterator<UFunction> FunctionIt(ParentClass, EFieldIteratorFlags::IncludeSuper); FunctionIt; ++FunctionIt )
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{
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const UFunction* Function = *FunctionIt;
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const FName FunctionName = Function->GetFName();
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UClass *OuterClass = CastChecked<UClass>(Function->GetOuter());
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// ignore skeleton classes and convert them into their "authoritative" types so they
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// can be found in the graph
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if(UBlueprintGeneratedClass *GeneratedOuterClass = Cast<UBlueprintGeneratedClass>(OuterClass))
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{
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OuterClass = GeneratedOuterClass->GetAuthoritativeClass();
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}
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if ( UEdGraphSchema_K2::CanKismetOverrideFunction(Function)
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&& !OverridableFunctionNames.Contains(FunctionName)
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&& !ImplementedFunctionCache.Contains(FunctionName)
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&& !FObjectEditorUtils::IsFunctionHiddenFromClass(Function, ParentClass)
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&& !FBlueprintEditorUtils::FindOverrideForFunction(BlueprintObj, OuterClass, Function->GetFName())
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&& Blueprint->AllowFunctionOverride(Function)
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)
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{
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FText FunctionTooltip = FText::FromString(UK2Node_CallFunction::GetDefaultTooltipForFunction(Function));
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FText FunctionDesc = K2Schema->GetFriendlySignatureName(Function);
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if ( FunctionDesc.IsEmpty() )
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{
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FunctionDesc = FText::FromString(Function->GetName());
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}
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if (Function->HasMetaData(FBlueprintMetadata::MD_DeprecatedFunction))
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{
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FunctionDesc = FBlueprintEditorUtils::GetDeprecatedMemberMenuItemName(FunctionDesc);
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}
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FText FunctionCategory = FObjectEditorUtils::GetCategoryText(Function);
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TSharedPtr<FEdGraphSchemaAction_K2Graph> NewFuncAction = MakeShareable(new FEdGraphSchemaAction_K2Graph(EEdGraphSchemaAction_K2Graph::Function, FunctionCategory, FunctionDesc, FunctionTooltip, 1, NodeSectionID::FUNCTION_OVERRIDABLE));
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NewFuncAction->FuncName = FunctionName;
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OverridableFunctionActions.Add(NewFuncAction);
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OverridableFunctionNames.Add(FunctionName);
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}
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}
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}
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```
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