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个人理解
当鼠标光标指向对象并点击时执行
官方注解
Event when this actor is clicked by the mouse when using the clickable interface. Target is Actor 翻译
目录树：
根目录 Add Event（添加事件） Mouse Input（鼠标输入）代码：
Begin Object Class=/Script/BlueprintGraph.K2Node_Event Name="K2Node_Event_29" EventReference=(MemberParent=Class'"/Script/Engine.Actor"',MemberName="ReceiveActorOnClicked") bOverrideFunction=True NodePosX=5552 NodePosY=5760 NodeGuid=54EA86C643E60A1C848752A15565DC0B CustomProperties Pin (PinId=E69E2627461FCBADBE739AAB896EFE57,PinName="OutputDelegate",Direction="EGPD_Output",PinType.PinCategory="delegate",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(MemberParent=Class'"/Script/Engine.Actor"',MemberName="ReceiveActorOnClicked"),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=7397E9F945663EF69DE8DB8F3DF4459C,PinName="then",Direction="EGPD_Output",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=530FF32349B67CEBF7DD7CA0C1E7377D,PinName="ButtonPressed",PinToolTip="Button Pressed\nKey 结构体",Direction="EGPD_Output",PinType.PinCategory="struct",PinType.PinSubCategory="",PinType.PinSubCategoryObject=ScriptStruct'"/Script/InputCore.Key"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) End Object