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