56 lines
1.7 KiB
Markdown
56 lines
1.7 KiB
Markdown
|
# NoElementDuplicate
|
|||
|
|
|
|||
|
|
- **功能描述：** 去除TArray属性里数据项的Duplicate菜单项按钮。
|
|||
|
|
- **使用位置：** UPROPERTY
|
|||
|
|
- **引擎模块：** Container Property
|
|||
|
|
- **元数据类型：** bool
|
|||
|
|
- **限制类型：** TArray
|
|||
|
|
- **常用程度：** ★
|
|||
|
|
|
|||
|
|
去除TArray属性里数据项的Duplicate菜单项按钮。
|
|||
|
|
|
|||
|
|
用于TArray属性，值可以是任何类型，可以是数值，结构，也可以是Object*。
|
|||
|
|
|
|||
|
|
## 测试代码：
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
public:
|
|||
|
|
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = IntArray)
|
|||
|
|
TArray<int32> MyIntArray;
|
|||
|
|
|
|||
|
|
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = IntArray, meta = (NoElementDuplicate))
|
|||
|
|
TArray<int32> MyIntArray_NoElementDuplicate;
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## 效果：
|
|||
|
|
|
|||
|
|
可以看到带有NoElementDuplicate的数组，在值的右侧下拉箭头的菜单项里只有两项。
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
## 原理：
|
|||
|
|
|
|||
|
|
判断如有NoElementDuplicate，则只生成Insert_Delete 菜单，否则是默认的Insert_Delete_Duplicate 。当然要求当前属性是数组属性，且不是EditFixedSize固定大小的。
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
void GetRequiredPropertyButtons( TSharedRef<FPropertyNode> PropertyNode, TArray<EPropertyButton::Type>& OutRequiredButtons, bool bUsingAssetPicker )
|
|||
|
|
{
|
|||
|
|
const FArrayProperty* OuterArrayProp = NodeProperty->GetOwner<FArrayProperty>();
|
|||
|
|
|
|||
|
|
if( OuterArrayProp )
|
|||
|
|
{
|
|||
|
|
if( PropertyNode->HasNodeFlags(EPropertyNodeFlags::SingleSelectOnly) && !(OuterArrayProp->PropertyFlags & CPF_EditFixedSize) )
|
|||
|
|
{
|
|||
|
|
if (OuterArrayProp->HasMetaData(TEXT("NoElementDuplicate")))
|
|||
|
|
{
|
|||
|
|
OutRequiredButtons.Add( EPropertyButton::Insert_Delete );
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
OutRequiredButtons.Add( EPropertyButton::Insert_Delete_Duplicate );
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
```
|