65 lines
2.7 KiB
Markdown
65 lines
2.7 KiB
Markdown
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# ShowOnlyInnerProperties
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- **功能描述：** 把结构属性的内部属性直接上提一个层级直接展示
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- **使用位置：** UPROPERTY
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- **元数据类型：** bool
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- **限制类型：** FStruct属性
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- **关联项：** [ShowInnerProperties](../ShowInnerProperties/ShowInnerProperties.md)
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- **常用程度：** ★★★
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把结构属性的内部属性直接上提一个层级直接展示，而不是像默认一样归属于一个可展开的父级结构。
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## 测试代码：
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```cpp
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UPROPERTY(EditAnywhere, BlueprintReadWrite)
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FMyPropertyInner InnerStruct;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (ShowOnlyInnerProperties))
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FMyPropertyInner InnerStruct_ShowOnlyInnerProperties;
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```
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## 效果对比：
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可以发现InnerStruct_ShowOnlyInnerProperties的内部属性直接就显示在对象的当前层级上，而InnerStruct的属性有一个结构名称作为Category来展开。
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## 原理：
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在遇见FStructProperty的时候，会开始判断ShowOnlyInnerProperties来决定是否要创建一个可展开的Category，或者还是直接把内部属性展示出来。有了ShowOnlyInnerProperties，就会直接递归迭代到其内部属性。
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```cpp
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void DetailLayoutHelpers::UpdateSinglePropertyMapRecursive(FPropertyNode& InNode, FName CurCategory, FComplexPropertyNode* CurObjectNode, FUpdatePropertyMapArgs& InUpdateArgs)
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{
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static FName ShowOnlyInners("ShowOnlyInnerProperties");
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// Whether or not to push out struct properties to their own categories or show them inside an expandable struct
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// This recursively applies for any nested structs that have the ShowOnlyInners metadata
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const bool bPushOutStructProps = bIsStruct && !bIsCustomizedStruct && Property->HasMetaData(ShowOnlyInners);
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if (bRecurseIntoChildren || LocalUpdateFavoriteSystemOnly)
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{
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// Built in struct properties or children of arras
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UpdateSinglePropertyMapRecursive(ChildNode, CurCategory, CurObjectNode, ChildArgs);
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}
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}
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void FObjectPropertyNode::GetCategoryProperties(const TSet<UClass*>& ClassesToConsider, const FProperty* CurrentProperty, bool bShouldShowDisableEditOnInstance, bool bShouldShowHiddenProperties,
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const TSet<FName>& CategoriesFromBlueprints, TSet<FName>& CategoriesFromProperties, TArray<FName>& SortedCategories)
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{
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if (CurrentProperty->HasMetaData(Name_ShowOnlyInnerProperties))
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{
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const FStructProperty* StructProperty = CastField<const FStructProperty>(CurrentProperty);
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if (StructProperty)
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{
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for (TFieldIterator<FProperty> It(StructProperty->Struct); It; ++It)
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{
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GetCategoryProperties(ClassesToConsider, *It, bShouldShowDisableEditOnInstance, bShouldShowHiddenProperties, CategoriesFromBlueprints, CategoriesFromProperties, SortedCategories);
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}
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}
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}
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}
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```
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