56 lines
2.2 KiB
Markdown
56 lines
2.2 KiB
Markdown
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# CustomFieldNotify
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- **功能描述：** 阻止UHT为该类生成FieldNotify的相关代码。
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- **引擎模块：** UHT
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- **元数据类型：** bool
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- **作用机制：** 在ClassFlags中增加[HasCustomFieldNotify](../../../Flags/EClassFlags/HasCustomFieldNotify.md)
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- **常用程度：** 0
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阻止UHT为该类生成FieldNotify的相关代码。
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在源码里只在UWidget上使用，例如该类里面的bIsEnabled是FieldNotify，正常来说UHT要为其生成代码。但如果该类想自己手动书写这些UHT代码，则可以加上CustomFieldNotify来阻止UHT生成。UWidget的cpp里因为要用别的方式UE_FIELD_NOTIFICATION_IMPLEMENT_CLASS_DESCRIPTOR，因此要拒绝UHT生成。
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如果自己的类也要自己UE_FIELD_NOTIFICATION_IMPLEMENT_CLASS_DESCRIPTOR，则可以用上CustomFieldNotify。
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## 源码例子：
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```cpp
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//E:\P4V\Engine\Source\Runtime\UMG\Public\FieldNotification\FieldNotificationDeclaration.h
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UCLASS(Abstract, BlueprintType, Blueprintable, CustomFieldNotify)
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class UMG_API UWidget : public UVisual, public INotifyFieldValueChanged
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{
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GENERATED_UCLASS_BODY()
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public:
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UE_FIELD_NOTIFICATION_DECLARE_CLASS_DESCRIPTOR_BASE_BEGIN(UMG_API)
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UE_FIELD_NOTIFICATION_DECLARE_FIELD(ToolTipText)
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UE_FIELD_NOTIFICATION_DECLARE_FIELD(Visibility)
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UE_FIELD_NOTIFICATION_DECLARE_FIELD(bIsEnabled)
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UE_FIELD_NOTIFICATION_DECLARE_ENUM_FIELD_BEGIN(ToolTipText)
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UE_FIELD_NOTIFICATION_DECLARE_ENUM_FIELD(Visibility)
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UE_FIELD_NOTIFICATION_DECLARE_ENUM_FIELD(bIsEnabled)
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UE_FIELD_NOTIFICATION_DECLARE_ENUM_FIELD_END()
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UE_FIELD_NOTIFICATION_DECLARE_CLASS_DESCRIPTOR_BASE_END();
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UPROPERTY(EditAnywhere, BlueprintReadWrite, FieldNotify, Getter="GetIsEnabled", Setter="SetIsEnabled", BlueprintGetter="GetIsEnabled", BlueprintSetter="SetIsEnabled", Category="Behavior")
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uint8 bIsEnabled:1;
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//cpp
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UE_FIELD_NOTIFICATION_IMPLEMENT_CLASS_DESCRIPTOR_ThreeFields(UWidget, ToolTipText, Visibility, bIsEnabled);
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```
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## 原理：
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在判断条件上可见HasCustomFieldNotify的判断。
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```cpp
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protected static bool NeedFieldNotifyCodeGen(UhtClass classObj)
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{
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return
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!classObj.ClassExportFlags.HasAnyFlags(UhtClassExportFlags.HasCustomFieldNotify) &&
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classObj.ClassExportFlags.HasAnyFlags(UhtClassExportFlags.HasFieldNotify);
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}
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```
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