标签：委托 void C++ DelegateName delegate Ue4 DECLARE DELEGATE
五种委托形式
1.单播委托
2.多播委托
3.事件
4.动态单播委托
5.动态多播委托
DelegateCombinations.h /** Declares a delegate that can only bind to one native function at a time */ #define DECLARE_DELEGATE( DelegateName ) FUNC_DECLARE_DELEGATE( DelegateName, void ) /** Declares a broadcast delegate that can bind to multiple native functions simultaneously */ #define DECLARE_MULTICAST_DELEGATE( DelegateName ) FUNC_DECLARE_MULTICAST_DELEGATE( DelegateName, void ) #define DECLARE_EVENT( OwningType, EventName ) FUNC_DECLARE_EVENT( OwningType, EventName, void ) /** Declares a blueprint-accessible delegate that can only bind to one UFUNCTION at a time */ #define DECLARE_DYNAMIC_DELEGATE( DelegateName ) BODY_MACRO_COMBINE(CURRENT_FILE_ID,_,__LINE__,_DELEGATE) FUNC_DECLARE_DYNAMIC_DELEGATE( FWeakObjectPtr, DelegateName, DelegateName##_DelegateWrapper, , FUNC_CONCAT( *this ), void ) /** Declares a blueprint-accessible broadcast delegate that can bind to multiple native UFUNCTIONs simultaneously */ #define DECLARE_DYNAMIC_MULTICAST_DELEGATE( DelegateName ) BODY_MACRO_COMBINE(CURRENT_FILE_ID,_,__LINE__,_DELEGATE) FUNC_DECLARE_DYNAMIC_MULTICAST_DELEGATE( FWeakObjectPtr, DelegateName, DelegateName##_DelegateWrapper, , FUNC_CONCAT( *this ), void )
Engine\Source\Runtime\Core\Public\Delegates
单播委托绑定
通过创建函数指针
DelegateSignatureImpl.inl
/** * Binds a UFunction-based member function delegate. * * UFunction delegates keep a weak reference to your object. * You can use ExecuteIfBound() to call them. */ template <typename UObjectTemplate, typename... VarTypes> inline void BindUFunction(UObjectTemplate* InUserObject, const FName& InFunctionName, VarTypes... Vars) { *this = CreateUFunction(InUserObject, InFunctionName, Vars...); }
/**
* Binds a UObject-based member function delegate.
*
* UObject delegates keep a weak reference to your object.
* You can use ExecuteIfBound() to call them.
*/
template <typename UserClass, typename... VarTypes>
inline void BindUObject(UserClass* InUserObject, typename TMemFunPtrType<false, UserClass, RetValType (ParamTypes..., VarTypes...)>::Type InFunc, VarTypes... Vars)
{
static_assert(!TIsConst<UserClass>::Value, "Attempting to bind a delegate with a const object pointer and non-const member function.");
*this = CreateUObject(InUserObject, InFunc, Vars...);
}
template <typename UserClass, typename... VarTypes>
inline void BindUObject(const UserClass* InUserObject, typename TMemFunPtrType<true, UserClass, RetValType (ParamTypes..., VarTypes...)>::Type InFunc, VarTypes... Vars)
{
*this = CreateUObject(InUserObject, InFunc, Vars...);
}
多播委托的绑定
/**
* Adds a delegate instance to this multicast delegate's invocation list.
*
* @param Delegate The delegate to add.
*/
FDelegateHandle Add(const FDelegate& InNewDelegate)
{
FDelegateHandle Result;
if (Super::GetDelegateInstanceProtectedHelper(InNewDelegate))
{
Result = Super::AddDelegateInstance(CopyTemp(InNewDelegate));
}
return Result;
}
/**
* Adds a UObject-based member function delegate.
*
* UObject delegates keep a weak reference to your object.
*
* @param InUserObject User object to bind to
* @param InFunc Class method function address
*/
template <typename UserClass, typename... VarTypes>
inline FDelegateHandle AddUObject(UserClass* InUserObject, typename TMemFunPtrType<false, UserClass, void (ParamTypes..., VarTypes...)>::Type InFunc, VarTypes... Vars)
{
static_assert(!TIsConst<UserClass>::Value, "Attempting to bind a delegate with a const object pointer and non-const member function.");
return Add(FDelegate::CreateUObject(InUserObject, InFunc, Vars...));
}
remove方法
/**
* Removes a delegate instance from this multi-cast delegate's invocation list (performance is O(N)).
*
* Note that the order of the delegate instances may not be preserved!
*
* @param Handle The handle of the delegate instance to remove.
* @return true if the delegate was successfully removed.
*/
bool Remove( FDelegateHandle Handle )
{
bool bResult = false;
if (Handle.IsValid())
{
bResult = RemoveDelegateInstance(Handle);
}
return bResult;
}
动态委托：
动态单播委托
动态多播委托
|
声明宏 |
描述 |
|---|---|
|
|
创建一个动态委托。 |
|
|
创建一个动态组播委托。 |
注：动态委托可序列化，其函数可按命名查找，但其执行速度比常规委托慢
多态委托简单使用
//动态委托可序列化，其函数可按命名查找，但其执行速度比常规委托慢
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FTestDyMulDELEGATE);
DECLARE_DYNAMIC_DELEGATE(FTestDyDELEGATE);
UPROPERTY(BlueprintAssignable,BlueprintCallable)
FTestDyMulDELEGATE TestDyMulDELEGATE;
FTestDyDELEGATE TestDyDELEGATE;
UFUNCTION(BlueprintCallable)
void ExDyDELEGATE();
UFUNCTION(BlueprintCallable)
void LogFunc();
UFUNCTION(BlueprintCallable)
void CallExDyMul();
UFUNCTION()
void DyMul_Log();
ATraceCharacter.cpp
//绑定
TestDyDELEGATE.BindUFunction(this,TEXT("LogFunc"));
TestDyMulDELEGATE.AddDynamic(this,&ATraceCharacter::DyMul_Log);
void ATraceCharacter::LogFunc()
{
//单播
UE_LOG(LogTemp,Warning,TEXT("DyDELEGATE Excute"))
}
void ATraceCharacter::ExDyDELEGATE()
{
//单播动态委托调用
TestDyDELEGATE.ExecuteIfBound();
}
void ATraceCharacter::CallExDyMul()
{
TestDyMulDELEGATE.Broadcast();
}
void ATraceCharacter::DyMul_Log()
{
UE_LOG(LogTemp, Warning, TEXT("DyMul_Log"));
}
多态多播委托：可在蓝图中调用/c++ Broadcast 调用
单播动态委托
标签：委托,void,C++,DelegateName,delegate,Ue4,DECLARE,DELEGATE 来源： https://www.cnblogs.com/zsymdbk/p/16122459.html
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