59 lines
2.0 KiB
Markdown
59 lines
2.0 KiB
Markdown
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# MakeEditWidget
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- **功能描述：** 使FVector和FTranform在场景编辑器里出现一个可移动的控件。
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- **使用位置：** UPROPERTY
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- **引擎模块：** Scene
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- **元数据类型：** bool
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- **限制类型：** FVector，FTranform
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- **关联项：** [ValidateWidgetUsing](../ValidateWidgetUsing/ValidateWidgetUsing.md)
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- **常用程度：** ★★★
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使FVector和FTranform在场景编辑器里出现一个可移动的控件。
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这样相比直接的数值编辑更加的直观一些。
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## 测试代码：
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```cpp
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UCLASS(BlueprintType)
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class INSIDER_API AMyActor_EditWidget :public AActor
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{
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GENERATED_BODY()
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public:
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UPROPERTY(EditAnywhere,BlueprintReadWrite,Category="EditWidget")
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FVector MyVector;
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UPROPERTY(EditAnywhere,BlueprintReadWrite,Category="EditWidget",meta=(MakeEditWidget))
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FVector MyVector_MakeEditWidget;
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};
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```
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## 测试结果：
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在蓝图里继承的AMyActor_EditWidget 子类里加上另外一个FTransform变量，可以看见“Show 3D Widget”的选项，这个和MyVector_MakeEditWidget都在场景里出现了可移动的控件。
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## 原理：
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判断如果是FVector或FTransform，并且有MakeEditWidget属性，则可以创建控件。
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```cpp
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/** Value of UPROPERTY can be edited with a widget in the editor (translation, rotation) */
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static UNREALED_API const FName MD_MakeEditWidget;
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/** Specifies a function used for validation of the current value of a property. The function returns a string that is empty if the value is valid, or contains an error description if the value is invalid */
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static UNREALED_API const FName MD_ValidateWidgetUsing;
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bool FLegacyEdModeWidgetHelper::CanCreateWidgetForStructure(const UStruct* InPropStruct)
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{
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return InPropStruct && (InPropStruct->GetFName() == NAME_Vector || InPropStruct->GetFName() == NAME_Transform);
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}
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bool FLegacyEdModeWidgetHelper::ShouldCreateWidgetForProperty(FProperty* InProp)
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{
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return CanCreateWidgetForProperty(InProp) && InProp->HasMetaData(MD_MakeEditWidget);
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}
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```
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