Re: custom widget with custom property

[dexter <dexter balabit hu>]

Answering to my question the solution so far is to create my own 
property_set callback, and in it:
1. call Glib::wrap to instantiate the class
2. call the original Glib::custom_set_property_callback

> ----- Original Message -----
> From: dexter <dexter balabit hu>
> To: gtkmm-list gnome org
> Sent: Thu, Aug 13, 2009 10:48:21 AM +0200
> Subject: custom widget with custom property
>
> Debugging further it seems that the custom widget is instantiated when 
> it gets to the </child> tag in this xml:
>
> <object class="gtkmm__CustomObject_bbvbox" id="bbvbox1">
>    <property name="visible">True</property>
>    <property name="orientation">vertical</property>
>    <child>
>      <object class="gtkmm__CustomObject_hbuttonboxstock" 
> id="hbuttonboxstock1">
>        <property name="visible">True</property>
>        <property name="Buttons">add-remove-edit</property>
>      </object>
>      <packing>
>        <property name="position">0</property>
>      </packing>
>     </child>
>
> So here is what happens:
> 1. Gtkbuilder parses the xml file
> 2. it gets to the property "Buttons" but it cannot set it because the 
> custom widget "gtkmm__CustomObject_hbuttonboxstock" not yet 
> instantiated: Glib::ObjectBase::_get_current_wrapper(object) == NULL
>
> 3. it gets to the </child> tag, calls gtk_container_add which calls our 
> own hbuttonboxstock_parent_set(GtkWidget *widget, GtkWidget 
> *previous_parent) function, which calls wrap_new and that is where the 
> hbuttonboxstock is instantiated
>
> Somehow the order is wrong. I just don't know yet, how to change the 
> order or why the C property setting is working and the C++ one is not.
>
> > ----- Original Message -----
> > From: dexter <dexter balabit hu>
> > To: gtkmm-list gnome org
> > Sent: Wed, Aug 12, 2009 2:43:05 PM +0200
> > Subject: custom widget with custom property
> >
> > Hi,
> >
> > I'm trying to create a custom widget with a custom enum property.
> > I managed to do that, and it appears in glade, I can choose from the 
> > property values, and it saves it correctly to the .glade file. 
> > (actually it's a gtkbuilder file just with .glade extension.. whatever).
> >
> > But when I start my program, it sets all the properties correctly from 
> > the .glade file except mine.
> >
> > Debugging shows, that this function:
> > void custom_set_property_callback(GObject* object, unsigned int 
> > property_id, const GValue* value, GParamSpec* param_spec) property.cc:121
> >
> > is called when the property is being set. When it gets to my custom 
> > property, in this line:
> >  if(Glib::ObjectBase *const wrapper = 
> > Glib::ObjectBase::_get_current_wrapper(object)) property.cc:124
> >
> > Glib::ObjectBase::_get_current_wrapper(object) will return NULL, so it 
> > won't set the property. And as I realized the custom widget is only 
> > instantiated _AFTER_ it tries to set the property (This can be the 
> > main cause of not setting it).
> >
> > Have you got any idea why is this happening?
> >
> > Thx,
> > Balazs
> > _______________________________________________
> > gtkmm-list mailing list
> > gtkmm-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtkmm-list
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