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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/DetailsPanel/HideInDetailPanel/HideInDetailPanel.md

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+# HideInDetailPanel
+
+- **功能描述：** 在Actor的事件面板里隐藏该动态多播委托属性。
+- **使用位置：** UPROPERTY
+- **引擎模块：** DetailsPanel
+- **元数据类型：** bool
+- **限制类型：** Actor里的动态多播委托
+- **常用程度：** ★★
+
+在Actor的事件面板里隐藏该动态多播委托属性。
+
+## 测试代码：
+
+```cpp
+UCLASS(BlueprintType,Blueprintable)
+class INSIDER_API AMyProperty_HideInDetailPanel :public AActor
+{
+	GENERATED_BODY()
+public:
+	DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnMyHideTestEvent);
+
+	UPROPERTY(BlueprintAssignable, Category = "Event")
+	FOnMyHideTestEvent MyEvent;
+
+	UPROPERTY(BlueprintAssignable, Category = "Event", meta = (HideInDetailPanel))
+	FOnMyHideTestEvent MyEvent_HideInDetailPanel;
+};
+
+```
+
+## 测试效果：
+
+测试步骤是在蓝图里创建AMyProperty_HideInDetailPanel 的子类，然后观察Event的显示情况。
+
+可见MyEvent会显示在Class Defautls里的Events，而MyEvent_HideInDetailPanel则没有显示。
+
+不过MyEvent_HideInDetailPanel依然是可以在蓝图里进行绑定，只不过默认没显示在UI上而已。
+
+![Untitled](Untitled.png)
+
+## 原理：
+
+先判断没有这个标记，然后创建相应的UI控件。
+
+```cpp
+void FActorDetails::AddEventsCategory(IDetailLayoutBuilder& DetailBuilder)
+{
+		IDetailCategoryBuilder& EventsCategory = DetailBuilder.EditCategory("Events", FText::GetEmpty(), ECategoryPriority::Uncommon);
+		static const FName HideInDetailPanelName("HideInDetailPanel");
+	
+		// Find all the Multicast delegate properties and give a binding button for them
+		for (TFieldIterator<FMulticastDelegateProperty> PropertyIt(Actor->GetClass(), EFieldIteratorFlags::IncludeSuper); PropertyIt; ++PropertyIt)
+		{
+			FMulticastDelegateProperty* Property = *PropertyIt;
+			
+			// Only show BP assiangable, non-hidden delegates		
+			if (!Property->HasAnyPropertyFlags(CPF_Parm) && Property->HasAllPropertyFlags(CPF_BlueprintAssignable) && !Property->HasMetaData(HideInDetailPanelName))
+			{}
+		}
+}
+
+void FBlueprintDetails::AddEventsCategory(IDetailLayoutBuilder& DetailBuilder, FName PropertyName, UClass* PropertyClass)
+{
+	static const FName HideInDetailPanelName("HideInDetailPanel");
+// Check for multicast delegates that we can safely assign
+if ( !Property->HasAnyPropertyFlags(CPF_Parm) && Property->HasAllPropertyFlags(CPF_BlueprintAssignable) &&
+				!Property->HasMetaData(HideInDetailPanelName) )
+}
+```