Re: [wxlua-users] Where do wxLuaEventCallbacks get deleted?

[Paul K <pau...@ya...>]

Hi Andreas,

> I'm trying to understand how wxLua handles its event mechanism. I can see that
> for every call to Connect(), wxLua will create a new object of wxLuaEventCallback.
> But I don't see where these get deleted.

If you want to delete callbacks explicitly, there is Disconnect()
call. I haven't looked at the wxlua source, but as far as I
understand, callbacks should be removed when Disconnect is called (I
use it in several places in my application).

Paul.

On Sat, Oct 5, 2013 at 10:45 AM, Andreas Falkenhahn
<an...@fa...> wrote:
> Hi,
>
> I'm trying to understand how wxLua handles its event mechanism. I can see that
> for every call to Connect(), wxLua will create a new object of wxLuaEventCallback.
> But I don't see where these get deleted.
>
> My assumption is that whenever a window is closed, wxLuaWinDestroyCallback will
> do the cleaning up and AFAICS it iterates over all event callbacks and calls
>
>         wxlCallback->ClearwxLuaState();
>
> on every callback it finds. But it also does the following:
>
>        wxluaR_unref(L, wxlCallback->GetLuaFuncRef(), &wxlua_lreg_refs_key);
>
> This is confusing me because this is also done in the wxLuaEventCallback dtor:
>
>         m_wxlState.wxluaR_Unref(m_luafunc_ref, &wxlua_lreg_refs_key);
>
> So are function references possibly removed twice here?
>
> But back to my original question: I'd like to know which code causes the
> wxLuaEventCallback dtor to be called. My assumption is that it is ClearWxLuaState()
> because that decrements the reference count and then the object might be marked
> for garbage collection by the wxWidgets main loop.
>
> But I don't know enough about C++ and wxWidgets so I'd really be glad if
> somebody could tell me if my assumption is right. I just need to know what
> code in wxLua triggers the wxLuaEventCallback dtor.
>
> Thanks!
>
> --
> Best regards,
>  Andreas Falkenhahn                          mailto:an...@fa...
>
>
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