H_SafeExperienceDrivingSystem/U3D_DrivingSystem/Assets/Script/TurnSignalController.cs

using System.Threading;
using UnityEngine;
using System.Threading.Tasks;

public class TurnSignalController : MonoBehaviour
{
    public GameObject leftTurnSignal;
    public GameObject rightTurnSignal;
    private Task currentBlinkTask = null;
    private CancellationTokenSource cancellationTokenSource;
    private int currentSignalType = 0; // 当前的信号类型

    public void SetSignal(int signalType)
    {
        // 如果当前信号类型与请求的信号类型相同，则不执行任何操作
        if (currentSignalType == signalType)
        {
            return;
        }

        currentSignalType = signalType; // 更新当前信号类型

        // 取消当前的动画任务（如果存在）
        if (cancellationTokenSource != null)
        {
            cancellationTokenSource.Cancel();
            cancellationTokenSource.Dispose();
        }

        cancellationTokenSource = new CancellationTokenSource();

        switch (signalType)
        {
            case 1: // 左转向灯
                currentBlinkTask = BlinkSignalAsync(leftTurnSignal, cancellationTokenSource.Token);
                rightTurnSignal.SetActive(false);
                break;
            case 2: // 右转向灯
                currentBlinkTask = BlinkSignalAsync(rightTurnSignal, cancellationTokenSource.Token);
                leftTurnSignal.SetActive(false);
                break;
            case 3: // 双闪灯
                currentBlinkTask = BlinkBothSignalsAsync(cancellationTokenSource.Token);
                break;
            // case 0: // 全部停止
            //     StopAllSignals();
            //     break;
        }
    }

    private async Task BlinkSignalAsync(GameObject signal, CancellationToken ct)
    {
        bool isOn = false;

        try
        {
            while (!ct.IsCancellationRequested)
            {
                isOn = !isOn;
                signal.SetActive(isOn);
                await Task.Delay(500, ct); // 等待500毫秒
            }
        }
        catch (TaskCanceledException)
        {
            // 任务被取消时执行
        }

        signal.SetActive(false); // 确保灯光关闭
    }

    private async Task BlinkBothSignalsAsync(CancellationToken ct)
    {
        bool isOn = false;

        try
        {
            while (!ct.IsCancellationRequested)
            {
                isOn = !isOn;
                leftTurnSignal.SetActive(isOn);
                rightTurnSignal.SetActive(isOn);
                await Task.Delay(500, ct); // 等待500毫秒
            }
        }
        catch (TaskCanceledException)
        {
            // 任务被取消时执行
        }

        leftTurnSignal.SetActive(false);
        rightTurnSignal.SetActive(false);
    }

    private void StopAllSignals()
    {
        if (cancellationTokenSource != null)
        {
            cancellationTokenSource.Cancel();
            cancellationTokenSource.Dispose();
        }

        leftTurnSignal.SetActive(false);
        rightTurnSignal.SetActive(false);
    }
}