UE4 C++学习记录-委托(单播、多播)和自定义事件。简单版本

一、委托

1、定义和声明

DECLARE_DELEGATE(FStandardDelegateSignature)
DECLARE_DELEGATE_OneParam(FParamDelegateSignature ,FLinearColor)
DECLARE_DELEGATE_几Param(FParamDelegateSignature ,几参数)
DECLARE_MULTICAST_DELEGATE(FMulticastDelegateSignature)

		FStandardDelegateSignature MyStandardDelegate;
		FParamDelegateSignature MyParamterDelegate;
		FMulticastDelegateSignature  MyMulticastDelegate;

2、绑定与解绑

1、单播

	MyGameMode->MyStandardDelegate.BindUObject(this, &ADelegateListener::EnableLight);
	MyGameMode->MyStandardDelegate.Unbind();
	MyGameMode->MyParamterDelegate.BindUObject(this, &AParamDelegateListener::SetLightColor,false);

	

2、多播

	
	MyDelegateHandle=	MyGameMode->MyMulticastDelegate.AddUObject(this, &AMulticastDelegateListener::ToggleLight);
	 MyGameMode->MyMulticastDelegate.Remove(MyDelegateHandle);

3、执行

1、单播

			MyGameMode->MyStandardDelegate.ExecuteIfBound();
			MyGameMode->MyParamterDelegate.ExecuteIfBound(FLinearColor(1,0,0,1));
	

2、多播

	
		MyGameMode->MyMulticastDelegate.Broadcast();

二、自定义事件

1、声明和定义

//自定义事件
DECLARE_EVENT(AMyTriggerVolume,FPlayerEntered)
	FPlayerEntered  OnPlayerEntered;

2、绑定与解绑

TriggerEventSource->OnPlayerEntered.AddUObject(this, &ATriggerVolEventListener::onTriggerEvent);
TriggerEventSource->OnPlayerEntered.Remove(MyDelegateHandle);

3、执行

OnPlayerEntered.Broadcast();