67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
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# AllowPreserveRatio
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- **功能描述：** 在细节面板上为FVector属性添加一个比率锁。
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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：** FVector
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- **常用程度：** ★★★
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在细节面板上为FVector属性添加一个比率锁。
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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 = VectorTest)
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FVector MyVector_Default;
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UPROPERTY(EditAnywhere, Category = VectorTest, meta = (AllowPreserveRatio))
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FVector MyVector_AllowPreserveRatio;
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UPROPERTY(EditAnywhere, Category = VectorTest, meta = (ShowNormalize))
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FVector MyVector_ShowNormalize;
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```
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## 测试结果：
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可见MyVector_AllowPreserveRatio的值在锁上之后可以形成固定的比率。
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## 原理：
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其实就是UI定制化的时候检测出AllowPreserveRatio就创建单独的UI。
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```cpp
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void FMathStructCustomization::MakeHeaderRow(TSharedRef<class IPropertyHandle>& StructPropertyHandle, FDetailWidgetRow& Row)
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{
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if (StructPropertyHandle->HasMetaData("AllowPreserveRatio"))
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{
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if (!GConfig->GetBool(TEXT("SelectionDetails"), *(StructPropertyHandle->GetProperty()->GetName() + TEXT("_PreserveScaleRatio")), bPreserveScaleRatio, GEditorPerProjectIni))
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{
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bPreserveScaleRatio = true;
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}
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HorizontalBox->AddSlot()
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.AutoWidth()
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.MaxWidth(18.0f)
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.VAlign(VAlign_Center)
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[
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// Add a checkbox to toggle between preserving the ratio of x,y,z components of scale when a value is entered
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SNew(SCheckBox)
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.IsChecked(this, &FMathStructCustomization::IsPreserveScaleRatioChecked)
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.OnCheckStateChanged(this, &FMathStructCustomization::OnPreserveScaleRatioToggled, StructWeakHandlePtr)
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.Style(FAppStyle::Get(), "TransparentCheckBox")
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.ToolTipText(LOCTEXT("PreserveScaleToolTip", "When locked, scales uniformly based on the current xyz scale values so the object maintains its shape in each direction when scaled"))
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[
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SNew(SImage)
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.Image(this, &FMathStructCustomization::GetPreserveScaleRatioImage)
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.ColorAndOpacity(FSlateColor::UseForeground())
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]
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];
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}
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}
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```
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