97 lines
3.2 KiB
Markdown
97 lines
3.2 KiB
Markdown
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# HideAssetPicker
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- **功能描述：** 隐藏Object类型引脚上的AssetPicker的选择列表
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- **使用位置：** UFUNCTION
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- **引擎模块：** Object Property
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- **元数据类型：** strings="a，b，c"
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- **限制类型：** UObject*
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- **常用程度：** ★★
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隐藏Object类型引脚上的AssetPicker的选择列表。这在有时我们只是想要自己传递Object引用，不希望用户选择到引擎里别的资产的时候会比较有用。因为Asset类型其实也是Object，因此对于Object引用类型的参数叫做HideAssetPicker。
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在源码里并没有找到有使用的地方，但是这个功能是可用的。
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## 测试代码：
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```cpp
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UFUNCTION(BlueprintCallable)
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static void MyFunc_NoHideAssetPicker(UObject* ObjectClass) {}
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UFUNCTION(BlueprintCallable, meta = (HideAssetPicker = "ObjectClass"))
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static void MyFunc_HideAssetPicker(UObject* ObjectClass) {}
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```
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## 蓝图效果：
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默认的情况MyFunc_NoHideAssetPicker是可以弹出选择列表的。而MyFunc_HideAssetPicker则就隐藏了起来。
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## 原理：
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判断一个函数引脚是否允许打开AssetPicker的逻辑是：
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- 必须是个object 类型
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- 如果是UActorComponent则不显示
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- 如果是Actor类型，那么得在关卡蓝图中，且该Actor是placeable的才显示。
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- 如果用HideAssetPicker显式指定了该参数，则该参数也不显示。
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```cpp
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bool UEdGraphSchema_K2::ShouldShowAssetPickerForPin(UEdGraphPin* Pin) const
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{
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bool bShow = true;
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if (Pin->PinType.PinCategory == PC_Object)
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{
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UClass* ObjectClass = Cast<UClass>(Pin->PinType.PinSubCategoryObject.Get());
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if (ObjectClass)
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{
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// Don't show literal buttons for component type objects
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bShow = !ObjectClass->IsChildOf(UActorComponent::StaticClass());
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if (bShow && ObjectClass->IsChildOf(AActor::StaticClass()))
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{
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// Only show the picker for Actor classes if the class is placeable and we are in the level script
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bShow = !ObjectClass->HasAllClassFlags(CLASS_NotPlaceable)
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&& FBlueprintEditorUtils::IsLevelScriptBlueprint(FBlueprintEditorUtils::FindBlueprintForNode(Pin->GetOwningNode()));
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}
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if (bShow)
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{
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if (UK2Node_CallFunction* CallFunctionNode = Cast<UK2Node_CallFunction>(Pin->GetOwningNode()))
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{
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if (UFunction* FunctionRef = CallFunctionNode->GetTargetFunction())
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{
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const UEdGraphPin* WorldContextPin = CallFunctionNode->FindPin(FunctionRef->GetMetaData(FBlueprintMetadata::MD_WorldContext));
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bShow = ( WorldContextPin != Pin );
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// Check if we have explictly marked this pin as hiding the asset picker
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const FString& HideAssetPickerMetaData = FunctionRef->GetMetaData(FBlueprintMetadata::MD_HideAssetPicker);
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if(!HideAssetPickerMetaData.IsEmpty())
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{
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TArray<FString> PinNames;
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HideAssetPickerMetaData.ParseIntoArray(PinNames, TEXT(","), true);
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const FString PinName = Pin->GetName();
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for(FString& ParamNameToHide : PinNames)
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{
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ParamNameToHide.TrimStartAndEndInline();
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if(ParamNameToHide == PinName)
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{
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bShow = false;
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break;
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}
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}
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}
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}
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}
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else if (Cast<UK2Node_CreateDelegate>( Pin->GetOwningNode()))
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{
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bShow = false;
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}
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}
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}
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}
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return bShow;
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}
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```
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