Re: Question about widgets

[Tristan Van Berkom <vantr touchtunes com>]

> GtkWidget *button;

is a pointer

> GtkWidget button;

would be an `automatic' declaration
of the GtkWidget data structure.

a widget is created by the GObject/GType
system with a function like:

gtk_button_new();

which will return the address of
a newly allocated and initialized
widget.



>   It has an interesting thing which is, it has a single widget 'button'
> assigned to 2 different button instances "Button 1" and "Button 2". How
> is this possible? Is it possible to assign a single widget for multiple
> different buttons of the same characterstics?

No. there are two widgets in this picture; only
one pointer was automaticly allocated to point 
to either of them.


Cheers,
                        -Tristan



> int main( int   argc,char *argv[] )
> {
>     GtkWidget *window;
>     GtkWidget *button;
>     GtkWidget *box1;





Vikram S Bartakke wrote:
> Hi All,
>
>  Following is a small upgraded hallo window program from the tutorial
> site at http://www.gtk.org/tutorial1.2/gtk_tut-3.html#ss3.3
>
>   It has an interesting thing which is, it has a single widget 'button'
> assigned to 2 different button instances "Button 1" and "Button 2". How
> is this possible? Is it possible to assign a single widget for multiple
> different buttons of the same characterstics?
>
> I would be glad if anybody can provide me the answer.
>
> thanks in advance,
>
> code is below:-
> ==============
>
> int main( int   argc,char *argv[] )
> {
>     GtkWidget *window;
>     GtkWidget *button;
>     GtkWidget *box1;
>
>     gtk_init (&argc, &argv);
>
>     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>     gtk_signal_connect (GTK_OBJECT (window), "delete_event",
>                         GTK_SIGNAL_FUNC (delete_event), NULL);
>     gtk_container_set_border_width (GTK_CONTAINER (window), 10);
>
>     box1 = gtk_hbox_new(FALSE, 0);
>     gtk_container_add (GTK_CONTAINER (window), box1);
>
>     button = gtk_button_new_with_label ("Button 1");
>     gtk_signal_connect (GTK_OBJECT (button), "clicked",
>                    GTK_SIGNAL_FUNC (callback), (gpointer) "button 1");
>     gtk_box_pack_start(GTK_BOX(box1), button, TRUE, TRUE, 0);
>     gtk_widget_show(button);
>
>     button = gtk_button_new_with_label ("Button 2");
>     gtk_signal_connect (GTK_OBJECT (button), "clicked",
>                    GTK_SIGNAL_FUNC (callback), (gpointer) "button 2");
>     gtk_box_pack_start(GTK_BOX(box1), button, TRUE, TRUE, 0);
>     gtk_widget_show(button);
>
>     gtk_widget_show(box1);
>     gtk_widget_show (window);
>
>     gtk_main ();
>     return(0);
> }
>
> ========================================
> Vikram S Bartakke
> Grad Student (CS Dept)
> University of New Mexico
> Albuquerque, NM 87131
> ========================================
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