116 lines
3.7 KiB
Markdown
116 lines
3.7 KiB
Markdown
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# ProhibitedInterfaces
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- **功能描述：** 列出与蓝图类不兼容的接口，阻止实现
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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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- **常用程度：** ★★
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## 测试代码：
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```cpp
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UINTERFACE(Blueprintable,MinimalAPI)
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class UMyInterface_First:public UInterface
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{
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GENERATED_UINTERFACE_BODY()
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};
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class INSIDER_API IMyInterface_First
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{
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GENERATED_IINTERFACE_BODY()
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public:
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UFUNCTION(BlueprintCallable, BlueprintImplementableEvent)
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void FirstFunc() const;
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};
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UINTERFACE(Blueprintable,MinimalAPI)
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class UMyInterface_Second:public UInterface
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{
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GENERATED_UINTERFACE_BODY()
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};
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class INSIDER_API IMyInterface_Second
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{
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GENERATED_IINTERFACE_BODY()
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public:
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UFUNCTION(BlueprintCallable, BlueprintImplementableEvent)
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void SecondFunc() const;
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};
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UCLASS(Blueprintable,meta=(ProhibitedInterfaces="UMyInterface_Second"))
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class INSIDER_API UMyClass_ProhibitedInterfaces :public UObject
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{
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GENERATED_BODY()
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public:
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};
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```
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## 测试结果：
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发现UMyInterface_Second被阻止实现了，但是UMyInterface_First依然可以被实现
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## 原理代码：
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可以看到在构造列表的时候，进行了过滤筛选。同时发现了.RightChop(1);的使用，因此填的接口名称，要加上U的前缀。如果UMyInterface_Second
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```cpp
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TSharedRef<SWidget> FBlueprintEditorUtils::ConstructBlueprintInterfaceClassPicker( const TArray< UBlueprint* >& Blueprints, const FOnClassPicked& OnPicked)
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{
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//...
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UClass const* const ParentClass = Blueprint->ParentClass;
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// see if the parent class has any prohibited interfaces
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if ((ParentClass != nullptr) && ParentClass->HasMetaData(FBlueprintMetadata::MD_ProhibitedInterfaces))
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{
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FString const& ProhibitedList = Blueprint->ParentClass->GetMetaData(FBlueprintMetadata::MD_ProhibitedInterfaces);
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TArray<FString> ProhibitedInterfaceNames;
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ProhibitedList.ParseIntoArray(ProhibitedInterfaceNames, TEXT(","), true);
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// loop over all the prohibited interfaces
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for (int32 ExclusionIndex = 0; ExclusionIndex < ProhibitedInterfaceNames.Num(); ++ExclusionIndex)
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{
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ProhibitedInterfaceNames[ExclusionIndex].TrimStartInline();
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FString const& ProhibitedInterfaceName = ProhibitedInterfaceNames[ExclusionIndex].RightChop(1);
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UClass* ProhibitedInterface = UClass::TryFindTypeSlow<UClass>(ProhibitedInterfaceName);
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if(ProhibitedInterface)
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{
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Filter->DisallowedClasses.Add(ProhibitedInterface);
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Filter->DisallowedChildrenOfClasses.Add(ProhibitedInterface);
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}
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}
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}
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// Do not allow adding interfaces that are already added to the Blueprint
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TArray<UClass*> InterfaceClasses;
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FindImplementedInterfaces(Blueprint, true, InterfaceClasses);
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for(UClass* InterfaceClass : InterfaceClasses)
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{
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Filter->DisallowedClasses.Add(InterfaceClass);
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}
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// Include a class viewer filter for imported namespaces if the class picker is being hosted in an editor context
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TSharedPtr<IToolkit> AssetEditor = FToolkitManager::Get().FindEditorForAsset(Blueprint);
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if (AssetEditor.IsValid() && AssetEditor->IsBlueprintEditor())
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{
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TSharedPtr<IBlueprintEditor> BlueprintEditor = StaticCastSharedPtr<IBlueprintEditor>(AssetEditor);
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TSharedPtr<IClassViewerFilter> ImportedClassViewerFilter = BlueprintEditor->GetImportedClassViewerFilter();
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if (ImportedClassViewerFilter.IsValid())
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{
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Options.ClassFilters.AddUnique(ImportedClassViewerFilter.ToSharedRef());
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}
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}
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}
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// never allow parenting to children of itself
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for (UClass* BPClass : BlueprintClasses)
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{
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Filter->DisallowedChildrenOfClasses.Add(BPClass);
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}
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return FModuleManager::LoadModuleChecked<FClassViewerModule>("ClassViewer").CreateClassViewer(Options, OnPicked);
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}
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```
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