How to send GtkWidgets to the back or front? - c

Question

I wonder if there is a way to "Send to back" or "Bring to front" a GtkWidget dynamically. ( I know, it can be done by changing the creating order of GtkWidget )
example : (GTK+ 2.0, Cent OS 7.0, C)
#include <gtk/gtk.h>
int main( int argc, char *argv[] )
{
GtkWidget *window, *button1, *button2, *fixed;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
button1 = gtk_button_new_with_label("A button");
button2 = gtk_button_new_with_label("B button");
fixed = gtk_fixed_new();
gtk_fixed_put( (GtkFixed*)fixed,button2, 30, 30 );
gtk_fixed_put( (GtkFixed*)fixed,button1, 50, 50 );
gtk_container_add(GTK_CONTAINER(window), fixed);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
this program will display : (the first picture)
Are there some commands that can make the "B Button" be in front of "A Button". ( look likes this following picture --> the second picture )

Answer 1

No, there aren't "functions" like those in a GtkFixed.
From the Gtk 2 documentation:
Description
The GtkFixed widget is a container which can place child widgets at
fixed positions and with fixed sizes, given in pixels. GtkFixed
performs no automatic layout management.
For most applications, you should not use this container! It keeps you
from having to learn about the other GTK+ containers, but it results
in broken applications. With GtkFixed, the following things will
result in truncated text, overlapping widgets, and other display bugs:
Themes, which may change widget sizes.
Fonts other than the one you used to write the app will of course change the size of widgets containing text; keep in mind that users
may use a larger font because of difficulty reading the default, or
they may be using Windows or the framebuffer port of GTK+, where
different fonts are available.
Translation of text into other languages changes its size. Also, display of non-English text will use a different font in many cases.
In addition, the fixed widget can't properly be mirrored in
right-to-left languages such as Hebrew and Arabic. i.e. normally GTK+
will flip the interface to put labels to the right of the thing they
label, but it can't do that with GtkFixed. So your application will
not be usable in right-to-left languages.
Finally, fixed positioning makes it kind of annoying to add/remove GUI
elements, since you have to reposition all the other elements. This is
a long-term maintenance problem for your application.
If you know none of these things are an issue for your application,
and prefer the simplicity of GtkFixed, by all means use the widget.
But you should be aware of the tradeoffs.
The order by which they are added is the order they will keep in the virtual Z axis. You can control this by removing and readding them or other similar approaches.