80 lines
3.2 KiB
Markdown
80 lines
3.2 KiB
Markdown
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# EditInlineNew
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- **功能描述：** 指定该类的对象可以在属性细节面板里直接内联创建，要和属性的Instanced配合。
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- **引擎模块：** Instance
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- **元数据类型：** bool
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- **作用机制：** 在ClassFlags中添加[CLASS_EditInlineNew](../../../../Flags/EClassFlags/CLASS_EditInlineNew.md)
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- **关联项：** NotEditInlineNew (NotEditInlineNew.md)
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- **常用程度：★★★★★**
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指定该类的对象可以在属性细节面板里直接内联创建。
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如果想在细节面板里直接创建对象，属性上也必须先标记Instanced或ShowInnerProperties。
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EditInlineNew主要是用在UObject的子类上，一般不标EditInlineNew的是用在Actor或资产的引用上。注意EditInlineNew是表明增加从属性细节面板里直接创建对象实例的能力，而非限制只能在属性细节面板里创建，当然也可以自己手动NewObject再赋值给对象引用属性。
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这个跟UPROPERTY上的Instanced能力是独立的。如果UCLASS上不加EditInlineNew，但是属性上加上Instanced，则在手动NewObject赋值该属性后，该属性也会展开内部属性来提供编辑功能。因为Instanced的属性会自动的在property上加上EditInline的meta。
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此说明符会传播到所有子类；子类可通过 NotEditInlineNew 说明符覆盖它。
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## 示例代码：
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```cpp
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UCLASS(Blueprintable, EditInlineNew)
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class INSIDER_API UMyClass_EditInlineNew :public UObject
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{
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GENERATED_BODY()
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite)
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int32 MyProperty;
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};
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UCLASS(Blueprintable, NotEditInlineNew)
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class INSIDER_API UMyClass_NotEditInlineNew :public UObject
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{
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GENERATED_BODY()
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite)
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int32 MyProperty;
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};
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UCLASS(Blueprintable, BlueprintType)
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class INSIDER_API UMyClass_Edit_Test :public UObject
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{
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GENERATED_BODY()
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Instanced, Category = InstancedProperty)
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UMyClass_EditInlineNew* MyEditInlineNew;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Instanced, Category = InstancedProperty)
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UMyClass_NotEditInlineNew* MyNotEditInlineNew;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = NormalProperty)
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UMyClass_EditInlineNew* MyEditInlineNew_NotInstanced;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = NormalProperty)
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UMyClass_NotEditInlineNew* MyNotEditInlineNew_NotInstanced;
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};
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```
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## 示例效果：
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EditInlineNew支持直接C++或BP子类创建对象实例，然后在上面编辑实例。
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而NotEditInlineNew的属性则无法找到支持的类来创建对象。
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如果属性上没有Instanced则只能尝试去引用（找不到对象）。
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## 原理：
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判断该类是否有CLASS_EditInlineNew来决定是否可内联创建编辑。
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```cpp
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template <typename TClass, typename TIsChildOfFunction>
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bool FPropertyEditorInlineClassFilter::IsClassAllowedHelper(TClass InClass, TIsChildOfFunction IsClassChildOf, TSharedRef< FClassViewerFilterFuncs > InFilterFuncs)
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{
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const bool bMatchesFlags = InClass->HasAnyClassFlags(CLASS_EditInlineNew) &&
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!InClass->HasAnyClassFlags(CLASS_Hidden | CLASS_HideDropDown | CLASS_Deprecated) &&
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(bAllowAbstract || !InClass->HasAnyClassFlags(CLASS_Abstract));
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}
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```
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