80 lines
1.6 KiB
Markdown
80 lines
1.6 KiB
Markdown
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# HiddenNode
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- **功能描述：** 把指定的UBTNode隐藏不在右键菜单中显示。
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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：** bool
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- **限制类型：** UBTNode
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- **常用程度：** ★
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把指定的UBTNode隐藏不在右键菜单中显示。
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## 测试代码：
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```cpp
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UCLASS(MinimalAPI,meta = ())
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class UMyBT_NotHiddenNode : public UBTDecorator
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{
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GENERATED_UCLASS_BODY()
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UPROPERTY(Category = Node, EditAnywhere)
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float MyFloat;
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};
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UCLASS(MinimalAPI,meta = (HiddenNode))
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class UMyBT_HiddenNode : public UBTDecorator
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{
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GENERATED_UCLASS_BODY()
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UPROPERTY(Category = Node, EditAnywhere)
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float MyFloat;
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};
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```
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## 测试结果：
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可见只有UMyBT_NotHiddenNode 显示了出来，而UMyBT_HiddenNode 被隐藏了。
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## 原理：
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原理比较简单，就是坚持元数据标记，然后设置bIsHidden 。
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```cpp
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bool FGraphNodeClassHelper::IsHidingClass(UClass* Class)
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{
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static FName MetaHideInEditor = TEXT("HiddenNode");
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return
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Class &&
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((Class->HasAnyClassFlags(CLASS_Native) && Class->HasMetaData(MetaHideInEditor))
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|| ForcedHiddenClasses.Contains(Class));
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}
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//D:\github\UnrealEngine\Engine\Source\Editor\AIGraph\Private\AIGraphTypes.cpp
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void FGraphNodeClassHelper::BuildClassGraph()
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{
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for (TObjectIterator<UClass> It; It; ++It)
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{
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UClass* TestClass = *It;
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if (TestClass->HasAnyClassFlags(CLASS_Native) && TestClass->IsChildOf(RootNodeClass))
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{
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NewData.bIsHidden = IsHidingClass(TestClass);
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NewNode->Data = NewData;
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if (TestClass == RootNodeClass)
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{
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RootNode = NewNode;
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}
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NodeList.Add(NewNode);
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}
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}
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}
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```
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