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

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

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+# EditInline
+
+- **功能描述：** 为对象属性创建一个实例，并作为子对象。
+
+- **使用位置：** UPROPERTY
+
+- **引擎模块：** DetailsPanel
+
+- **元数据类型：** bool
+
+- **关联项：** [NoEditInline](../NoEditInline.md), [AllowEditInlineCustomization](../AllowEditInlineCustomization/AllowEditInlineCustomization.md), [ForceInlineRow](../ForceInlineRow/ForceInlineRow.md)
+
+  UPROPERTY：[Instanced](../../../Specifier/UPROPERTY/Instance/Instanced/Instanced.md)
+
+- **常用程度：** ★★★
+
+为对象属性创建一个实例，并作为子对象。
+
+也可以手动设置。如果UClass上有EditInlineNew，但是属性上没有Instanced，这个时候可以手动的设置EditInline然后通过自己手动赋值对象引用属性来使得这个对象可以直接编辑。
+
+和ShowInnerProperties是否等价？EditInline在对象容器（Array,Map,Set）的情况下，也可以使用。但ShowInnerProperties只能在单个对象属性上生效。
+
+可以设置在Struct上？看源码里也有该设置。但其实并没有效果。
+
+## 示例代码：
+
+```cpp
+	UPROPERTY(EditAnywhere, BlueprintReadWrite)
+	UMyProperty_EditInline_Sub* MyObject;
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (EditInline))
+	UMyProperty_EditInline_Sub* MyObject_EditInline;
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (NoEditInline))
+	UMyProperty_EditInline_Sub* MyObject_NoEditInline;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite)
+	TArray<UMyProperty_EditInline_Sub*> MyObjectArray;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (EditInline))
+	TArray<UMyProperty_EditInline_Sub*> MyObjectArray_EditInline;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (NoEditInline))
+	TArray<UMyProperty_EditInline_Sub*> MyObjectArray_NoEditInline;
+```
+
+## 蓝图效果：
+
+![Untitled](Untitled.png)
+
+## 原理：
+
+会相应的设置EPropertyNodeFlags::EditInlineNew。
+
+```cpp
+void FPropertyNode::InitNode(const FPropertyNodeInitParams& InitParams)
+{
+		// we are EditInlineNew if this property has the flag, or if inside a container that has the flag.
+		bIsEditInlineNew = GotReadAddresses && bIsObjectOrInterface && !MyProperty->HasMetaData(Name_NoEditInline) && 
+			(MyProperty->HasMetaData(Name_EditInline) || (bIsInsideContainer && OwnerProperty->HasMetaData(Name_EditInline)));
+		bShowInnerObjectProperties = bIsObjectOrInterface && MyProperty->HasMetaData(Name_ShowInnerProperties);
+		
+		if (bIsEditInlineNew)
+		{
+			SetNodeFlags(EPropertyNodeFlags::EditInlineNew, true);
+		}
+		else if (bShowInnerObjectProperties)
+		{
+			SetNodeFlags(EPropertyNodeFlags::ShowInnerObjectProperties, true);
+		}
+}
+
+bool SPropertyEditorEditInline::Supports( const FPropertyNode* InTreeNode, int32 InArrayIdx )
+{
+	return InTreeNode
+		&& InTreeNode->HasNodeFlags(EPropertyNodeFlags::EditInlineNew)
+		&& InTreeNode->FindObjectItemParent()
+		&& !InTreeNode->IsPropertyConst();
+}
+
+void FItemPropertyNode::InitExpansionFlags(void)
+{
+	FProperty* MyProperty = GetProperty();
+
+	if (TSharedPtr<FPropertyNode>& ValueNode = GetOrCreateOptionalValueNode())
+	{
+		// This is a set optional, so check its SetValue instead.
+		MyProperty = ValueNode->GetProperty();
+	}
+
+	bool bExpandableType = CastField<FStructProperty>(MyProperty)
+		|| (CastField<FArrayProperty>(MyProperty) || CastField<FSetProperty>(MyProperty) || CastField<FMapProperty>(MyProperty));
+
+	if (bExpandableType
+		|| HasNodeFlags(EPropertyNodeFlags::EditInlineNew)
+		|| HasNodeFlags(EPropertyNodeFlags::ShowInnerObjectProperties)
+		|| (MyProperty->ArrayDim > 1 && ArrayIndex == -1))
+	{
+		SetNodeFlags(EPropertyNodeFlags::CanBeExpanded, true);
+	}
+}
+```