2.3 KiB
2.3 KiB
BlueprintReadOnly
- 功能描述： 此属性可由蓝图读取，但不能被修改。
- 元数据类型： bool
- 引擎模块： Blueprint
- 作用机制： 在PropertyFlags中加入CPF_BlueprintVisible, CPF_BlueprintReadOnly
- 常用程度： ★★★★★
此属性可由蓝图读取，但不能被修改。此说明符与 BlueprintReadWrite 说明符不兼容。
示例代码：
public:
//PropertyFlags: CPF_BlueprintVisible | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPublic
UPROPERTY(BlueprintReadWrite, Category = Blueprint)
int32 MyInt_ReadWrite = 123;
//PropertyFlags: CPF_BlueprintVisible | CPF_BlueprintReadOnly | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPublic
UPROPERTY(BlueprintReadOnly, Category = Blueprint)
int32 MyInt_ReadOnly = 123;
示例效果：
指定蓝图中只读：
原理：
有CPF_BlueprintVisible 就可以Get
加上CPF_BlueprintReadOnly 后就不能修改。
EPropertyAccessResultFlags PropertyAccessUtil::CanGetPropertyValue(const FProperty* InProp)
{
if (!InProp->HasAnyPropertyFlags(CPF_Edit | CPF_BlueprintVisible | CPF_BlueprintAssignable))
{
return EPropertyAccessResultFlags::PermissionDenied | EPropertyAccessResultFlags::AccessProtected;
}
return EPropertyAccessResultFlags::Success;
}
FBlueprintEditorUtils::EPropertyWritableState FBlueprintEditorUtils::IsPropertyWritableInBlueprint(const UBlueprint* Blueprint, const FProperty* Property)
{
if (Property)
{
if (!Property->HasAnyPropertyFlags(CPF_BlueprintVisible))
{
return EPropertyWritableState::NotBlueprintVisible;
}
if (Property->HasAnyPropertyFlags(CPF_BlueprintReadOnly))
{
return EPropertyWritableState::BlueprintReadOnly;
}
if (Property->GetBoolMetaData(FBlueprintMetadata::MD_Private))
{
const UClass* OwningClass = Property->GetOwnerChecked<UClass>();
if (OwningClass->ClassGeneratedBy.Get() != Blueprint)
{
return EPropertyWritableState::Private;
}
}
}
return EPropertyWritableState::Writable;
}