83 lines
4.5 KiB
Markdown
83 lines
4.5 KiB
Markdown
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# Grouping
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- **功能描述：** Enum /Script/Engine.EAlphaBlendOption
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- **使用位置：** UENUM::UMETA
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- **引擎模块：** Enum Property
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- **元数据类型：** bool
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- **常用程度：** 0
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感觉是用在Sequencer里面的，只用在SEasingFunctionGridWidget里面。
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## 源码例子：
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```cpp
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UENUM()
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enum class EAlphaBlendOption : uint8
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{
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Linear = 0 UMETA(Grouping = Linear, DisplayName = "Linear", ToolTip = "Linear interpolation"),
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Cubic UMETA(Grouping = Cubic, DisplayName = "Cubic In", ToolTip = "Cubic-in interpolation"),
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HermiteCubic UMETA(Grouping = Cubic, DisplayName = "Hermite-Cubic InOut", ToolTip = "Hermite-Cubic"),
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Sinusoidal UMETA(Grouping = Sinusoidal, DisplayName = "Sinusoidal", ToolTip = "Sinusoidal interpolation"),
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QuadraticInOut UMETA(Grouping = Quadratic, DisplayName = "Quadratic InOut", ToolTip = "Quadratic in-out interpolation"),
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CubicInOut UMETA(Grouping = Cubic, DisplayName = "Cubic InOut", ToolTip = "Cubic in-out interpolation"),
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QuarticInOut UMETA(Grouping = Quartic, DisplayName = "Quartic InOut", ToolTip = "Quartic in-out interpolation"),
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QuinticInOut UMETA(Grouping = Quintic, DisplayName = "Quintic InOut", ToolTip = "Quintic in-out interpolation"),
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CircularIn UMETA(Grouping = Circular, DisplayName = "Circular In", ToolTip = "Circular-in interpolation"),
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CircularOut UMETA(Grouping = Circular, DisplayName = "Circular Out", ToolTip = "Circular-out interpolation"),
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CircularInOut UMETA(Grouping = Circular, DisplayName = "Circular InOut", ToolTip = "Circular in-out interpolation"),
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ExpIn UMETA(Grouping = Exponential, DisplayName = "Exponential In", ToolTip = "Exponential-in interpolation"),
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ExpOut UMETA(Grouping = Exponential, DisplayName = "Exponential Out", ToolTip = "Exponential-Out interpolation"),
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ExpInOut UMETA(Grouping = Exponential, DisplayName = "Exponential InOut", ToolTip = "Exponential in-out interpolation"),
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Custom UMETA(Grouping = Custom, DisplayName = "Custom", ToolTip = "Custom interpolation, will use custom curve inside an FAlphaBlend or linear if none has been set"),
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};
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UENUM()
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enum class EMovieSceneBuiltInEasing : uint8
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{
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// Linear easing
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Linear UMETA(Grouping=Linear,DisplayName="Linear"),
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// Sinusoidal easing
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SinIn UMETA(Grouping=Sinusoidal,DisplayName="Sinusoidal In"), SinOut UMETA(Grouping=Sinusoidal,DisplayName="Sinusoidal Out"), SinInOut UMETA(Grouping=Sinusoidal,DisplayName="Sinusoidal InOut"),
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// Quadratic easing
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QuadIn UMETA(Grouping=Quadratic,DisplayName="Quadratic In"), QuadOut UMETA(Grouping=Quadratic,DisplayName="Quadratic Out"), QuadInOut UMETA(Grouping=Quadratic,DisplayName="Quadratic InOut"),
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// Cubic easing
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Cubic UMETA(Grouping = Cubic, DisplayName = "Cubic"), CubicIn UMETA(Grouping=Cubic,DisplayName="Cubic In"), CubicOut UMETA(Grouping=Cubic,DisplayName="Cubic Out"), CubicInOut UMETA(Grouping=Cubic,DisplayName="Cubic InOut"), HermiteCubicInOut UMETA(Grouping = Cubic, DisplayName = "Hermite-Cubic InOut"),
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// Quartic easing
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QuartIn UMETA(Grouping=Quartic,DisplayName="Quartic In"), QuartOut UMETA(Grouping=Quartic,DisplayName="Quartic Out"), QuartInOut UMETA(Grouping=Quartic,DisplayName="Quartic InOut"),
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// Quintic easing
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QuintIn UMETA(Grouping=Quintic,DisplayName="Quintic In"), QuintOut UMETA(Grouping=Quintic,DisplayName="Quintic Out"), QuintInOut UMETA(Grouping=Quintic,DisplayName="Quintic InOut"),
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// Exponential easing
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ExpoIn UMETA(Grouping=Exponential,DisplayName="Exponential In"), ExpoOut UMETA(Grouping=Exponential,DisplayName="Exponential Out"), ExpoInOut UMETA(Grouping=Exponential,DisplayName="Exponential InOut"),
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// Circular easing
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CircIn UMETA(Grouping=Circular,DisplayName="Circular In"), CircOut UMETA(Grouping=Circular,DisplayName="Circular Out"), CircInOut UMETA(Grouping=Circular,DisplayName="Circular InOut"),
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// Custom
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Custom UMETA(Grouping = Custom, DisplayName = "Custom"),
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};
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```
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## 原理：
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```cpp
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TArray<SEasingFunctionGridWidget::FGroup> SEasingFunctionGridWidget::ConstructGroups(const TSet<EMovieSceneBuiltInEasing>& FilterExclude)
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{
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const UEnum* EasingEnum = StaticEnum<EMovieSceneBuiltInEasing>();
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check(EasingEnum)
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TArray<FGroup> Groups;
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for (int32 NameIndex = 0; NameIndex < EasingEnum->NumEnums() - 1; ++NameIndex)
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{
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const FString& Grouping = EasingEnum->GetMetaData(TEXT("Grouping"), NameIndex);
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EMovieSceneBuiltInEasing Value = (EMovieSceneBuiltInEasing)EasingEnum->GetValueByIndex(NameIndex);
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if (FilterExclude.IsEmpty() || FilterExclude.Find(Value) == nullptr)
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{
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FindOrAddGroup(Groups, Grouping).Values.Add(Value);
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}
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}
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return Groups;
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}
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```
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