vault backup: 2024-10-12 17:19:45

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parent ff94ddca61
commit 244c0c52f6
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--- a/03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Enum/UMETA/Grouping.md
+++ b/03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Enum/UMETA/Grouping.md
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+# 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：
+
+```cpp
+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：
+
+```cpp
+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;
+}
+```