Re: newbie question

[Dov Grobgeld <dov grobgeld gmail com>]

Hi Frederico,

(Copied from my own post from Mar 23, 2006 12:31:00 pm)

Here are four additional possibilities:

1. Use global variables for your widgets.

2. Create a struct containing pointers to all your widgets and use the
userdata field to pass this struct around in all callbacks.

3. Use the g_object_set_data() method to attach miscellaneous pointers to
your widgets. I.e. in the widget construction do:

GtkWidget *w_tree_view, *w_button; w_tree_view = gtk_tree_view_new(...); :
w_button = gtk_button_new(); g_object_set_data(G_OBJECT(w_button),
"tree_view", w_tree_view); g_signal_connect(G_OBJECT(w_button), "clicked",
G_CALLBACK(cb_button_clicked), NULL);

and in the callback cb_button_clicked() do:

GtkWidget *w_tree_view = GTK_WIDGET(g_object_get_data(G_OBJECT(widget),
"tree_view"));

This method is similar to what glade is doing.

4. Create your own container widget, e.g. by gob2 or vala and put all your
widgets in it. This is a fancy way of doing the struct callback I mentioned
above.

Hope this helps.

Regards,

Dov


2009/3/11 Tadej Borovšak <tadeboro gmail com>

> 2009/3/11 frederico schardong <frede sch gmail com>:
> > > void my_callback_function (GtkButton *widget, gpointer user_ptr);
> > >
> > > ...
> > >
> > > g_signal_connect( G_OBJECT( widget), "clicked",
> > >       G_CALLBACK( my_callback_function), user_ptr );
> > >
> > >
> > > void my_callback_function (GtkButton *widget, gpointer user_ptr) {
> > >
> > >       ...
> > > }
> > >
> > >
> > > http://library.gnome.org/devel/gtk/unstable/GtkButton.html
> >
> > but how I can pass to my_callback_function the gtk_drawing_area? I
> > know about the g_signal_connect.. but I not know how pass another
> > widget,         without the widget being passed the first parameter of
> > function..
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
> Hello.
>
> Just pass your drawing area as a last parameter to g_signal_connect
> function.
>
> Simple code would look like:
>
> ---------- CODE -----------
> int
> main( int argc, char **argv )
> {
>    GtkWidget *button = gtk_button_new();
>    GtkWidget *draw = gtk_drawing_area_new();
>
>    g_signal_connect( G_OBJECT( button ), "clicked",
>                      G_CALLBACK( cb_clicked ), draw );
>
>    /* More code here */
> }
>
>
> /* Callback function */
> static void
> cb_clicked( GtkButton *button,
>            GtkWidget *draw )
> {
>    /* Code here to save your work */
> }
>
> ------- /CODE ----------
>
> --
> Tadej Borovšak
> tadeboro gmail com
> tadej borovsak gmail com
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list