RE: g_object_class_install_property

[Madhusudan E <madhusudan huawei com>]

Hi Daniel and Tristan,

Thanks for your replies.

 

I did succeed installing the properties, more or less same as you have
defined in the example.

 

I have one concern here,

After I had installed the properties , I had used g_object_new
(GTK_TYPE_WIDGET, NULL) to create the object in gtk_widget_new() function.

But (as per ur example) gnome_db_grid_set_property () wasn?t invoked.

But when I created the object by passing the ?first_argument? name, i.e
g_object_new(GTK_TYPE_WIDGET, ?raw_grid?, value, NULL) only then 

gnome_db_grid_set_property() was invoked.

 

All I want to know is, Well the above stated behaviour of GTK is default
behavior or Am I going wrong some where.

 

Thanks,

 

Madhusudan E,

HTIPL, Bangalore-08

 

- 9980527224

www.huawei.com

 

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  _____  

From: Daniel Espinosa [mailto:esodan gmail com] 
Sent: Wednesday, August 23, 2006 11:10 PM
To: Tristan Van Berkom
Cc: Madhusudan E; gtk-app-devel-list gnome org
Subject: Re: g_object_class_install_property

 

For an example of how to create GObjects (all GktWidgets are derived from
it), you can check the code in CVS for diferent objects in Gnome-DB in:

http://cvs.gnome.org/viewcvs/libgnomedb/libgnomedb/ 

Gnome-Db defines a lot of new Widgets to manipulate data from Data Bases,
then I think is a good example. Review the GObject documentation.

You mus have a your_widget_class_init function with this:

/* Properties */
        object_class->set_property = gnome_db_grid_set_property;
        object_class->get_property = gnome_db_grid_get_property;
    g_object_class_install_property (object_class, PROP_RAW_GRID, 
                                         g_param_spec_object ("raw_grid",
NULL, NULL, 
                                  GNOME_DB_TYPE_RAW_GRID,
                                  G_PARAM_READABLE));
    g_object_class_install_property (object_class, PROP_INFO,
                                         g_param_spec_object ("widget_info",
NULL, NULL, 
                                  GNOME_DB_TYPE_DATA_WIDGET_INFO, 
                                  G_PARAM_READABLE));



2006/8/23, Tristan Van Berkom <tvb gnome org>:

Madhusudan E wrote:
> Hi,
> The property wasn't defined on the object, But it started working when I
> defined the first_property in g_object_new().
>
> I have a query here,
> Doesn't the gobject_class->set_property function be invoked without
sending 
> the first_property parameter in g_object_new().
> If not then somewhere it needs to documented.

I dont understand your question really,
   - g_object_new() creates an object with the specified properties 
     (if any properties are specified - otherwise they are assumed to be
     the defaults that you specified in the GParamSpec)
   - You can later set these properties using g_object_set()
   - If you cant set a property using g_object_set() later on - then you 
     probably didnt give it G_PARAM_WRITABLE permissions or you called it
     G_PARAM_CONSTRUCT_ONLY.

Cheers,
                -Tristan
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