Changing the background color of a window

[j. santana]

Hi

I'm trying to change the background color of a window
randomly, but I always get a black filled window,
even though I get random values from g_rand.
(I'm trying this as an exercise in learning GTK.)

What would be the best way to achieve this effect ?

static int
configure_event_cb(GtkWidget * w, GdkEvent * e, gpointer p) {
    GdkColor color;
    GdkEventConfigure * cfg = (GdkEventConfigure*)e;
    width = cfg->width;
    height = cfg->height;
    color.red = g_rand_int_range(rand,0,256);
    color.green = g_rand_int_range(rand,0,256);
    color.blue = g_rand_int_range(rand,0,256);
    g_print("1.red=%d green=%d blue=%d\n",
        color.red,color.green,color.blue);
    gtk_widget_modify_bg(w,GTK_STATE_NORMAL,&color);

    color = w->style->bg[GTK_STATE_NORMAL];
    g_print("2.red=%d green=%d blue=%d\n",
       color.red,color.green,color.blue);
    gtk_widget_queue_draw(w);

    return TRUE;

    }

static int
expose_event_cb(GtkWidget * w, GdkEvent * e, gpointer p) {
     GdkGC * gc = w->style->bg_gc[GTK_STATE_NORMAL];
     gdk_draw_rectangle(w->window,gc,TRUE,0,0,width,height);
     return TRUE;
     }


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