64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
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# Icon
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- **功能描述：** 设定FRigUnit蓝图节点的图标。
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- **使用位置：** USTRUCT
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- **引擎模块：** RigVMStruct
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- **元数据类型：** string="abc"
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- **限制类型：** FRigUnit
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- **常用程度：** ★★
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设定FRigUnit蓝图节点的图标。
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根据源码中的注释得知，Icon的格式是“StyleSetName|StyleName|SmallStyleName|StatusOverlayStyleName”，最后两项是可选的，可参考FSlateIcon的更多介绍。
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## 测试代码：
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```cpp
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USTRUCT(meta = (DisplayName = "MyRigIcon",Icon="EditorStyle|GraphEditor.Macro.ForEach_16x"))
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struct INSIDER_API FRigUnit_MyRigIcon: public FRigUnit
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{
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GENERATED_BODY()
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RIGVM_METHOD()
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virtual void Execute() override;
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public:
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UPROPERTY(meta = (Input))
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float MyFloat_Input = 123.f;
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UPROPERTY(meta = (Output))
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float MyFloat_Output = 123.f;
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};
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```
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## 测试效果：
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可见加了Icon之后，左上角图标变成了其他，不是默认的f函数目标。
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## 原理：
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```cpp
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FSlateIcon URigVMEdGraphNode::GetIconAndTint(FLinearColor& OutColor) const
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{
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if(MetadataScriptStruct && MetadataScriptStruct->HasMetaDataHierarchical(FRigVMStruct::IconMetaName))
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{
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FString IconPath;
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const int32 NumOfIconPathNames = 4;
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FName IconPathNames[NumOfIconPathNames] = {
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NAME_None, // StyleSetName
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NAME_None, // StyleName
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NAME_None, // SmallStyleName
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NAME_None // StatusOverlayStyleName
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};
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// icon path format: StyleSetName|StyleName|SmallStyleName|StatusOverlayStyleName
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// the last two names are optional, see FSlateIcon() for reference
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MetadataScriptStruct->GetStringMetaDataHierarchical(FRigVMStruct::IconMetaName, &IconPath);
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return FSlateIcon(IconPathNames[0], IconPathNames[1], IconPathNames[2], IconPathNames[3]);
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}
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}
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```
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