思路：重载Actor的单击事件，通过计时器判断时间段内鼠标惦记的次数

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "TestActor.generated.h"DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FPlottingOnClicked, AActor*, TouchedActor);/*** 标绘对象基类*/
UCLASS(BlueprintType, Blueprintable)
class TEST_API TestActor: public AActor
{GENERATED_BODY()public:	// Sets default values for this actor's propertiesTestActor();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;public://鼠标点击次数，判断单击双击事件int clickedNum = 0;// 事件//单击事件UPROPERTY(BlueprintAssignable, BlueprintCallable)FPlottingOnClicked EventDispatcher_PlottingOnClicked;//双击事件UPROPERTY(BlueprintAssignable, BlueprintCallable)FPlottingOnClicked EventDispatcher_PlottingOnDoubleClicked;//重写Actor的点击事件virtual void NotifyActorOnClicked(FKey ButtonPressed = EKeys::LeftMouseButton) override;};

// Fill out your copyright notice in the Description page of Project Settings.#include "TestActor.h"// Sets default values
TestActor::TestActor()
{// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.PrimaryActorTick.bCanEverTick = true;}// Called when the game starts or when spawned
void TestActor::BeginPlay()
{Super::BeginPlay();}// Called every frame
void TestActor::Tick(float DeltaTime)
{Super::Tick(DeltaTime);}//单击、双击事件
void TestActor::NotifyActorOnClicked(FKey ButtonPressed)
{Super::NotifyActorOnClicked(ButtonPressed);if (ButtonPressed == EKeys::LeftMouseButton){clickedNum++;// 设置计时器来判断单击或双击  FTimerHandle timerHandle;GetWorldTimerManager().SetTimer(timerHandle, [this](void){if (clickedNum == 1){UE_LOG(LogTemp, Log, TEXT("single"));EventDispatcher_PlottingOnClicked.Broadcast(this);}else if (clickedNum == 2){UE_LOG(LogTemp, Log, TEXT("double"));EventDispatcher_PlottingOnDoubleClicked.Broadcast(this);}else{UE_LOG(LogTemp, Error, TEXT("invalid clickedNumber"));}clickedNum = 0; // 重置点击计数器  }, 0.25f, false); // 设置计时器的时间间隔为0.25秒，并且只触发一次  }
}