Re: [Protux-devel] reimplementation of GlobalProperties

[Martin Herren]

On Thu, 16 Jan 2003 15:02:42 -0200
Luciano Giordana <address@hidden> wrote:

> > ok, it's implemented know and seems to work fine. i'm thinking about
> > additionally let MustuxGlobalProperties emit a signal when a specific
> > key changes... so you can get notified in a more QTish way when a key
> > changes, and that won't required to have static callback functions.
> 
> That is good. I had many problems with static callbacks (remember Reinhard 
> ;-) in 2001

hope there will be less here !

There is just a small problem with using signal and slots with 
MustuxGlobalProperties: only objects derived from QObject can emit and receive 
qt-signals, but MustuxGlobalProperties is not a class. So i see 2 solutions:

 - make MustuxGlobalProperties a class derived from QObject. This means also 
that there won't be any more static functions to access MustuxGlobalProperties, 
but you'll have to call a member function of an object of this class. Of course 
the pointer to this object will be declared global. So the application using 
Mustux will have to instanciate such an object at the begining (instead of the 
current init(), which will be performed by the constructor).
(application code will have to do a properties->set() instead of a 
MustuxGlobalProperties::set())

 - keep all function of MustuxGlobalProperties static, and deriving the 
internal class KeyData from QObject. This would need a new 
MustuxGlobalProperties function: get_keydata(QString key), so that the 
application can connect to it. Furthermore KeyData must then be declared in a 
header file, but i prefere keeping this whole class private.

So i recommend the first solution, as it's more clean, and from the application 
perspective it will also be easier to use. And there is only one step required 
to connect to it (connect), instead of two (get_keydata and connect).

/Martin

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Martin Herren                             +41 (0)79 746 57 83
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