89 lines
3.2 KiB
Markdown
89 lines
3.2 KiB
Markdown
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# InlineEditConditionToggle
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- **功能描述：** 使这个bool属性在被用作EditCondition的时候内联到对方的属性行里成为一个单选框，而不是自己成为一个编辑行。
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- **使用位置：** UPROPERTY
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- **元数据类型：** bool
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- **限制类型：** bool
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- **关联项：** [EditCondition](../EditCondition/EditCondition.md)
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- **常用程度：** ★★★★★
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使这个bool属性在被用作EditCondition的时候内联到对方的属性行里成为一个单选框，而不是自己成为一个编辑行。
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虽然EditCondition支持别的类型属性或者是表达式，但是这个InlineEditConditionToggle只支持bool属性。
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## 测试代码：
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```cpp
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = InlineEditConditionToggle, meta = (InlineEditConditionToggle))
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bool MyBool_Inline;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = InlineEditConditionToggle, meta = (EditCondition = "MyBool_Inline"))
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int32 MyInt_EditCondition_UseInline = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = InlineEditConditionToggle)
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int32 MyThirdInt_Inline = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = InlineEditConditionToggle, meta = (EditCondition = "MyThirdInt_Inline>200"))
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int32 MyInt_EditConditionExpression_UseInline = 123;
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```
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## 测试效果：
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可见MyBool_Inline变成了单选框。而MyThirdInt_Inline就没有被隐藏掉。
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## 原理：
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可以看到用这个判断是否支持出现单选框。
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```cpp
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bool FPropertyNode::SupportsEditConditionToggle() const
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{
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if (!Property.IsValid())
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{
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return false;
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}
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FProperty* MyProperty = Property.Get();
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static const FName Name_HideEditConditionToggle("HideEditConditionToggle");
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if (EditConditionExpression.IsValid() && !Property->HasMetaData(Name_HideEditConditionToggle))
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{
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const FBoolProperty* ConditionalProperty = EditConditionContext->GetSingleBoolProperty(EditConditionExpression);
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if (ConditionalProperty != nullptr)
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{
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// There are 2 valid states for inline edit conditions:
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// 1. The property is marked as editable and has InlineEditConditionToggle set.
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// 2. The property is not marked as editable and does not have InlineEditConditionToggle set.
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// In both cases, the original property will be hidden and only show up as a toggle.
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static const FName Name_InlineEditConditionToggle("InlineEditConditionToggle");
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const bool bIsInlineEditCondition = ConditionalProperty->HasMetaData(Name_InlineEditConditionToggle);
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const bool bIsEditable = ConditionalProperty->HasAllPropertyFlags(CPF_Edit);
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if (bIsInlineEditCondition == bIsEditable)
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{
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return true;
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}
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if (bIsInlineEditCondition && !bIsEditable)
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{
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UE_LOG(LogPropertyNode, Warning, TEXT("Property being used as inline edit condition is not editable, but has redundant InlineEditConditionToggle flag. Field \"%s\" in class \"%s\"."), *ConditionalProperty->GetNameCPP(), *Property->GetOwnerStruct()->GetName());
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return true;
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}
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// The property is already shown, and not marked as inline edit condition.
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if (!bIsInlineEditCondition && bIsEditable)
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{
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return false;
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}
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}
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}
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return false;
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}
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```
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