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

From: Gustavo de Sá Carvalho Honorato
Subject: Re: [Libqtlua-list] Accessing QObject inside a property in Lua
Date: Tue, 18 Jan 2011 10:16:09 -0200

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.

>>> > It should not take too long for me to implement, it's just a matter of
>>> > accessing a QMap in the 'default:' section of a switch statement to
>>> > handle dynamically registered types cases. I have precise idea of how
>>> > user callbacks should be implemented and will update the manual with
>>> > examples.
>>> Very good! Thanks! I'm looking forward to this feature. You can count
>>> on me if you need any help.
>> Commited in subversion. Have a look to:
> Great! You are very efficient. One suggestion: the page
> could have a
> reference to this new way of type conversion. What you think?
>> --
>> Alexandre

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