lua协程 - 把回调模式的代码流程改成顺序执行流程

像ugui的点击按钮，然后触发相关逻辑，都是回调模式的写法，比如下面代码的ShowAlert调用

public class Test7 : MonoBehaviour
{
    public GameObject m_Alert;
    public Text m_TxtMsg;
    public Button m_BtnYes;
    public Button m_BtnNo;

    private LuaEnv m_LuaEnv;

    void Start()
    {
        m_LuaEnv = new LuaEnv();
        m_LuaEnv.AddLoader((ref string filePath) =>
        {
            filePath = filePath.Replace('.', '/');
            filePath = $"Assets/{filePath}.lua.txt";
            var txtAsset = AssetDatabase.LoadAssetAtPath<TextAsset>(filePath);
            return Encoding.UTF8.GetBytes(txtAsset.text);
        });

        m_LuaEnv.Global.Set("Test7MonoInst", this);
        m_LuaEnv.DoString("require('Lua.Test7')");
    }

    void OnDestroy()
    {
        if (null != m_LuaEnv)
            m_LuaEnv.Dispose();
    }

    //注意: Test7GenConfig不写, lua在调用该函数时无法识别Action<int>
    public void ShowAlert(string msg, Action<int> cb)
    {
        m_Alert.SetActive(true);
        m_TxtMsg.text = msg;

        m_BtnYes.onClick.AddListener(() =>
        {
            if (null != cb) cb(1);

            m_BtnYes.onClick.RemoveAllListeners();
            m_BtnNo.onClick.RemoveAllListeners();
            m_Alert.SetActive(false);
        });

        m_BtnNo.onClick.AddListener(() =>
        {
            if (null != cb) cb(-1);

            m_BtnYes.onClick.RemoveAllListeners();
            m_BtnNo.onClick.RemoveAllListeners();
            m_Alert.SetActive(false);
        });
    }

}

下面的是代码Gen配置（一定要写），同时还要生成下代码才行，否则lua代码没法正确执行

public static class Test7GenConfig
{
    [LuaCallCSharp]
    public static List<Type> LuaCallCsList = new List<Type>()
    {
        typeof(Action), //这个默认的不写, 下面的Action<int>会不生效
        typeof(Action<int>),
    };
}

 

下面的lua代码通过协程将ShowAlert的调用改成顺序执行，而不是通过提供回调函数

function ShowAlert(msg, cb)
    Test7MonoInst:ShowAlert(msg, cb)
end
    
function SyncWrap(func, msg)
    local coThread, isMain = coroutine.running()
    if isMain then error("no in coroutine") return end
    
    local cb = function(btn)
        --点击按钮时, 唤醒暂停在yield处的代码(1)
        coroutine.resume(coThread, btn)
    end
    func(msg, cb)
    local resumeParam = coroutine.yield() --此处暂停(1)，等待按钮点击时，调用resume唤醒
    local btn = resumeParam
    return btn
end
    
local coFunc = function()
    local btn = SyncWrap(ShowAlert, "确定要退出吗?")
    if 1 == btn then
        print("点击了Yes")
    elseif -1 == btn then
        print("点击了No")
    end
end

local coThread = coroutine.create(coFunc)
coroutine.resume(coThread) --执行到第1个yield处

 

SyncWrap更通用的写法

function SyncWrap(func, ...)
    local coThread, isMain = coroutine.running()
    if isMain then error("no in coroutine") return end

    local cb = function(btn)
        --点击按钮时, 唤醒暂停在yield处的代码(1)
        local flag, coReturn = coroutine.resume(coThread, btn)
    end
    
    local funcParams = { ... }
    table.insert(funcParams, cb)
    func(unpack(funcParams))
    local resumeParams = { coroutine.yield() } --此处暂停(1), 等待按钮点击时，调用resume唤醒
    local rets = unpack(resumeParam)
    return rets
end