88 lines
2.0 KiB
Markdown
88 lines
2.0 KiB
Markdown
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# Visible
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- **功能描述：** 指定FRigUnit下的该属性为常量引脚，无法连接变量。
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- **使用位置：** UPROPERTY
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- **引擎模块：** RigVMStruct
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- **元数据类型：** bool
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- **限制类型：** FRigUnit中属性
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- **关联项：** [Input](../Input/Input.md)
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- **常用程度：** ★★★
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指定FRigUnit下的该属性为常量引脚，无法连接变量。
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Visible和Input+Constant的效果是一致的。
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## 测试代码：
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```cpp
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USTRUCT(meta = (DisplayName = "MyRig"))
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struct INSIDER_API FRigUnit_MyRig : public FRigUnit
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{
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GENERATED_BODY()
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RIGVM_METHOD()
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virtual void Execute() override;
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public:
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UPROPERTY()
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float MyFloat_Normal;
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UPROPERTY(meta = (Input))
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float MyFloat_Input;
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UPROPERTY(meta = (Output))
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float MyFloat_Output;
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UPROPERTY(meta = (Input, Output))
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float MyFloat_IO;
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UPROPERTY(meta = (Hidden))
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float MyFloat_Hidden;
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UPROPERTY(meta = (Visible))
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float MyFloat_Visible;
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UPROPERTY(meta = (Input, Constant))
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float MyFloat_Constant;
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};
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```
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## 测试效果：
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Visible和Input+Constant的效果是一致的，也是成为一个常量。
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## 原理：
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```cpp
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UENUM(BlueprintType)
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enum class ERigVMPinDirection : uint8
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{
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Input, // A const input value
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Output, // A mutable output value
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IO, // A mutable input and output value
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Visible, // A const value that cannot be connected to
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Hidden, // A mutable hidden value (used for interal state)
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Invalid // The max value for this enum - used for guarding.
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};
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FRigVMPinInfo::FRigVMPinInfo(FProperty* InProperty, ERigVMPinDirection InDirection, int32 InParentIndex, const uint8* InDefaultValueMemory)
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{
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bIsConstant = InProperty->HasMetaData(TEXT("Constant"));
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}
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void URigVMController::ConfigurePinFromProperty(FProperty* InProperty, URigVMPin* InOutPin, ERigVMPinDirection InPinDirection) const
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{
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InOutPin->bIsConstant = InProperty->HasMetaData(TEXT("Constant"));
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}
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bool URigVMPin::CanBeBoundToVariable(const FRigVMExternalVariable& InExternalVariable, const FString& InSegmentPath) const
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{
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if (bIsConstant)
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{
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return false;
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}
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}
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```
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