58 lines
2.3 KiB
Markdown
58 lines
2.3 KiB
Markdown
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# BlueprintSetter
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- **功能描述：** 采用一个自定义的set函数来读取。
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- **元数据类型：** string="abc"
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- **引擎模块：** Blueprint
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- **作用机制：** 在PropertyFlags中加入[CPF_BlueprintVisible](../../../Flags/EPropertyFlags/CPF_BlueprintVisible.md)，在Meta中加入[BlueprintSetter](../../../Meta/Blueprint/BlueprintSetter.md)
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- **常用程度：** ★★★
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采用一个自定义的set函数来读取。
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会默认设置BlueprintReadWrite。
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## 测试代码：
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```cpp
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public:
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//(BlueprintGetter = , Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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UFUNCTION(BlueprintGetter, Category = Blueprint) //or BlueprintPure
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int32 MyInt_Getter()const { return MyInt_WithGetter * 2; }
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//(BlueprintSetter = , Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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UFUNCTION(BlueprintSetter, Category = Blueprint) //or BlueprintCallable
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void MyInt_Setter(int NewValue) { MyInt_WithSetter = NewValue / 4; }
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private:
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//(BlueprintGetter = MyInt_Getter, Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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//PropertyFlags: CPF_BlueprintVisible | CPF_BlueprintReadOnly | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPrivate
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UPROPERTY(BlueprintGetter = MyInt_Getter, Category = Blueprint)
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int32 MyInt_WithGetter = 123;
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//(BlueprintSetter = MyInt_Setter, Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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//PropertyFlags: CPF_BlueprintVisible | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPrivate
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UPROPERTY(BlueprintSetter = MyInt_Setter, Category = Blueprint)
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int32 MyInt_WithSetter = 123;
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```
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## 蓝图表现：
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## 原理：
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如果有MD_PropertySetFunction则用它来作为Set的调用。
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```cpp
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void UK2Node_VariableSet::ExpandNode(class FKismetCompilerContext& CompilerContext, UEdGraph* SourceGraph)
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{
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// If property has a BlueprintSetter accessor, then replace the variable get node with a call function
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if (VariableProperty)
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{
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// todo check with BP team if we need to test if the variable has native Setter
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const FString& SetFunctionName = VariableProperty->GetMetaData(FBlueprintMetadata::MD_PropertySetFunction);
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if (!SetFunctionName.IsEmpty())
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{
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}
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}
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}
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```
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