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Re: [Libqtlua-list] Accessing QObject inside a property in Lua

From: Alexandre Becoulet
Subject: Re: [Libqtlua-list] Accessing QObject inside a property in Lua
Date: Sat, 22 Jan 2011 00:41:17 +0100
User-agent: KMail/1.13.5 (Linux/2.6.36-ARCH; KDE/4.5.5; x86_64; ; )

On Tuesday, January 18, 2011 01:16:09 pm you wrote:
> 2011/1/17 Gustavo de Sá Carvalho Honorato <address@hidden>:
> > 2011/1/17 Alexandre Becoulet <address@hidden>:
> >> On Monday, January 17, 2011 07:39:37 pm you wrote:
> >> 
> >> Hi,
> >> 
> >>> >> > I guessed that. The problem is once registered as a Qt meta type,
> >>> >> > MainWindow* and QObject* are just different meta types. Qt meta
> >>> >> > types system does not enable QtLua to guess at runtime that
> >>> >> > MainWindow* can be interpreted as a QObject*, due to C++
> >>> >> > inheritance rules.
> >> 
> >> I found no way to even detect if the type is a pointer to a QObject or
> >> if its an array of floats or anything else from the registered meta
> >> type id. QMetaType is not designed to return a pointer to the
> >> QMetaObject when relevant. Any idea?
> > 
> > Ok, I think I misunderstood the problem. The problem is to retrieve
> > the QMetaObject from an metatype id. I'll try to think in something.
> I haven't had time to check this, but I was thinking in how
> QScriptEngine solve this problem. Do you know if QScriptEngine can do
> this conversions? If yes, our answer should be inside the
> QScriptEngine source code.

Didn't checked that yet, but you are right, QScriptEngine is the right place 
to dig.

In the mean time you can register pointers to QObject based classes with two 
lines of code as shown on the example. This should be a minor issue unless you 
plan to register a lot of such pointer types. What do you think?


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