question about gtk_events_pending() and gtk_main_iteration()

["Sergey I. Kuzminov" <ksi sparc spb su>]

Hi !

I have one question about loop:

while (gtk_events_pending())
    gtk_main_iteration();


Documenation says what gtk_events_pending() method can be used to update the
GUI.

I want to see toplevel window with my widget (for example, GtkSpinButton).
If I invoke g_usleep (1) during the loop I can see correct shown window and
button.
But if I comment this string, usually I can't see button.

Why ?


Thanks,
Sergey


-------------------------------
#include <gtk/gtk.h>

int
main (int argc, char** argv)
{
    GtkWidget* window;
    GtkWidget* button;
    gint i;

    gtk_init (&argc, &argv);

    for (i = 0; i < 10; i++)
    {
        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        button = gtk_spin_button_new_with_range (0, 10, 1);
        gtk_spin_button_set_value (GTK_SPIN_BUTTON (button), i);
        gtk_container_add (GTK_CONTAINER (window), button);
        gtk_container_set_border_width (GTK_CONTAINER (window), 30);

        gtk_widget_show_all (window);

        while (gtk_events_pending())
        {
//            g_usleep (1);
            gtk_main_iteration();
        }
        g_usleep (1000000);

        gtk_widget_destroy (window);
    }
}