85 lines
2.2 KiB
Markdown
85 lines
2.2 KiB
Markdown
|
# Hidden
|
|||
|
|
|
|||
|
|
- **功能描述：** 隐藏UENUM的某个值
|
|||
|
|
- **使用位置：** UENUM::UMETA
|
|||
|
|
- **引擎模块：** Enum Property
|
|||
|
|
- **元数据类型：** bool
|
|||
|
|
- **限制类型：** UENUM的值
|
|||
|
|
- **常用程度：** ★★★★★
|
|||
|
|
|
|||
|
|
隐藏UENUM的某个值。
|
|||
|
|
|
|||
|
|
## 测试代码：
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
|
|||
|
|
UENUM(Blueprintable,BlueprintType)
|
|||
|
|
enum class EMyEnum_Spacer_Hidden :uint8
|
|||
|
|
{
|
|||
|
|
MyNormal,
|
|||
|
|
MySpacer UMETA(Spacer),
|
|||
|
|
MyHidden UMETA(Hidden),
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
UCLASS(BlueprintType)
|
|||
|
|
class INSIDER_API UMyEnum_Test :public UObject
|
|||
|
|
{
|
|||
|
|
GENERATED_BODY()
|
|||
|
|
public:
|
|||
|
|
UPROPERTY(EditAnywhere,BlueprintReadWrite)
|
|||
|
|
EMyEnum_Spacer_Hidden MyEnum_Spacer_Hidden;
|
|||
|
|
};
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## 测试效果：
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
但是蓝图里访问：
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
## 原理：
|
|||
|
|
|
|||
|
|
在属性细节面板里生成枚举可能的值的时候，会判断Hidden和Spacer选项来隐藏。
|
|||
|
|
|
|||
|
|
但是在SEnumComboBox和SGraphPinEnum这种在蓝图里显示的时候，只会判断Hidden，而没有（忘了？）判断Spacer，因此MySpacer是依然会被显示出来。
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
bool FPropertyHandleBase::GeneratePossibleValues(TArray<FString>& OutOptionStrings, TArray< FText >& OutToolTips, TArray<bool>& OutRestrictedItems, TArray<FText>* OutDisplayNames)
|
|||
|
|
{
|
|||
|
|
// Ignore hidden enums
|
|||
|
|
bool bShouldBeHidden = Enum->HasMetaData(TEXT("Hidden"), EnumIndex ) || Enum->HasMetaData(TEXT("Spacer"), EnumIndex );
|
|||
|
|
if (!bShouldBeHidden)
|
|||
|
|
{
|
|||
|
|
if(ValidEnumValues.Num() > 0)
|
|||
|
|
{
|
|||
|
|
bShouldBeHidden = !ValidEnumValues.Contains(Enum->GetNameByIndex(EnumIndex));
|
|||
|
|
}
|
|||
|
|
// If both are specified, InvalidEnumValues takes precedence
|
|||
|
|
else if(InvalidEnumValues.Num() > 0)
|
|||
|
|
{
|
|||
|
|
bShouldBeHidden = InvalidEnumValues.Contains(Enum->GetNameByIndex(EnumIndex));
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void SEnumComboBox::Construct(const FArguments& InArgs, const UEnum* InEnum)
|
|||
|
|
{
|
|||
|
|
if (Enum->HasMetaData(TEXT("Hidden"), Index) == false)
|
|||
|
|
{
|
|||
|
|
VisibleEnums.Emplace(Index, Enum->GetValueByIndex(Index), Enum->GetDisplayNameTextByIndex(Index), Enum->GetToolTipTextByIndex(Index));
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void SGraphPinEnum::GenerateComboBoxIndexes( TArray< TSharedPtr<int32> >& OutComboBoxIndexes )
|
|||
|
|
{
|
|||
|
|
// Ignore hidden enum values
|
|||
|
|
if( !EnumPtr->HasMetaData(TEXT("Hidden"), EnumIndex ) )
|
|||
|
|
{
|
|||
|
|
TSharedPtr<int32> EnumIdxPtr(new int32(EnumIndex));
|
|||
|
|
OutComboBoxIndexes.Add(EnumIdxPtr);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
```
|