46 lines
1.3 KiB
Markdown
46 lines
1.3 KiB
Markdown
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# HideAlphaChannel
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- **功能描述：** 使FColor或FLinearColor属性在编辑的时候隐藏Alpha通道。
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- **使用位置：** UPROPERTY
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- **引擎模块：** Numeric Property
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- **元数据类型：** bool
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- **限制类型：** FColor , FLinearColor
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- **常用程度：** ★★★
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使FColor或FLinearColor属性在编辑的时候隐藏Alpha通道。
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## 测试代码：
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```cpp
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public:
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UPROPERTY(EditAnywhere, Category = AlphaTest)
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FColor MyColor;
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UPROPERTY(EditAnywhere, Category = AlphaTest, meta = (HideAlphaChannel))
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FColor MyColor_HideAlphaChannel;
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UPROPERTY(EditAnywhere, Category = AlphaTest)
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FLinearColor MyLinearColor;
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UPROPERTY(EditAnywhere, Category = AlphaTest, meta = (HideAlphaChannel))
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FLinearColor MyLinearColor_HideAlphaChannel;
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```
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## 测试结果：
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可见带有HideAlphaChannel的属性就没有了Alpha通道。
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## 原理：
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```cpp
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void FColorStructCustomization::CustomizeHeader(TSharedRef<class IPropertyHandle> InStructPropertyHandle, class FDetailWidgetRow& InHeaderRow, IPropertyTypeCustomizationUtils& StructCustomizationUtils)
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{
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bIgnoreAlpha = TypeSupportsAlpha() == false || StructPropertyHandle->GetProperty()->HasMetaData(TEXT("HideAlphaChannel"));
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}
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.AlphaDisplayMode(bIgnoreAlpha ? EColorBlockAlphaDisplayMode::Ignore : EColorBlockAlphaDisplayMode::Separate)
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```
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