UE4 Unlua源码解析5 - FLuaContext内重要方法逐行解释

Posted 2022-09-28 珞珈大胖强TURBO

FLuaContext内重要方法逐行解释

• • • • • 1 FindExportedReflectedClass
        • 2 NotifyUObjectCreated
        • 3 TryToBindLua

1 FindExportedReflectedClass

通过名字寻找静态导出的反射类

2 NotifyUObjectCreated

749 存储新Object

770 调用关键函数TryToBindLua，绑定UE4 Object到Lua

3 TryToBindLua

总结： 绑定Lua模块到UObject的函数

bool FLuaContext::TryToBindLua(UObjectBaseUtility* Object)

###1
    if (!bEnable || !IsUObjectValid(Object))
    
        return false;
    

    if (!Object->HasAnyFlags(RF_ClassDefaultObject | RF_ArchetypeObject))           // filter out CDO and ArchetypeObjects
    
        UClass* Class = Object->GetClass();
        if (Class->IsChildOf<UPackage>() || Class->IsChildOf<UClass>())             // filter out UPackage and UClass
        
            return false;
        
###1
###2
        static UClass* InterfaceClass = UUnLuaInterface::StaticClass();

        //!!!Fix!!!
        //all bind operation should be in gamethread,include dynamic bind
        if (Class->ImplementsInterface(InterfaceClass))                             // static binding
        
            // fliter some object in bp nest case
            // skip objects during asset loding 
            if (Object->HasAnyFlags(RF_NeedLoad) && Object->HasAnyFlags(RF_Load) && Object->GetFName().GetNumber() < 1 && Object->GetClass()->GetName().Contains(Object->GetName()))
            
                UE_LOG(LogUnLua, Log, TEXT("%s : Skip internal object (%s,%p,%s) during asset loading"), ANSI_TO_TCHAR(__FUNCTION__), *Object->GetFullName(), Object, *Class->GetName());
                return false;
            
###2

###3
            UFunction* Func = Class->FindFunctionByName(FName("GetModuleName"));    // find UFunction 'GetModuleName'. hard coded!!!
            if (Func)
            
            

                if (IsInGameThread())
                
                    FString ModuleName;
                    UObject* DefaultObject = Class->GetDefaultObject();             // get CDO
                    DefaultObject->UObject::ProcessEvent(Func, &ModuleName);        // force to invoke UObject::ProcessEvent(...)
                    if (ModuleName.Len() < 1)
                    
                        return false;
                    

                    if (!Object->HasAllFlags(RF_NeedPostLoad | RF_NeedInitialization))
                    
                        return Manager->Bind(Object, Class, *ModuleName, GLuaDynamicBinding.InitializerTableRef);   // bind!!!
                    
                    else
                    
                        // PostLoadObjects.Add((UObject*)Object);
                        OnDelayBindObject((UObject*)Object);
                    
                
                else
                
                    if (IsAsyncLoading())
                    
                        // check FAsyncLoadingThread::IsMultithreaded()?
                        FScopeLock Lock(&Async2MainCS);
                        Candidates.Add((UObject*)Object);                           // mark the UObject as a candidate
                    
                
            
        
###3
        else if (GLuaDynamicBinding.IsValid(Class))                                 // dynamic binding
        
            return Manager->Bind(Object, Class, *GLuaDynamicBinding.ModuleName, GLuaDynamicBinding.InitializerTableRef);
        
    
    return false;

###1 判断Object类型，屏蔽CDO，Archetype，UPackage，UClass对象，不对他们进行绑定

###2 加载中的资源类屏蔽

###3通过ProcessEvent拿到实现了GetModuleName方法的返回值，即lua模块的路径，然后调用到 Manager->Bind方法