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