GTK3.0 使用CSS设置控件背景色

/*  Compile with:   gcc -Wall -o backimage `pkg-config --cflags --libs gtk+-3.0` backimage.c */

#include <gtk/gtk.h>

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

/*----- CSS ----------- */
  GtkCssProvider *provider;
  GdkDisplay *display;
  GdkScreen *screen;
/*-----------------------*/

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
/*
    gtk_window_set_default_size (GTK_WINDOW(window),
                                 500, 300);
*/

  g_signal_connect (GTK_WIDGET(window),
                    "destroy",
                    G_CALLBACK (gtk_main_quit),
                    NULL);

/*------------- CSS  --------------------------------------------------------------------------------------------------*/
  provider = gtk_css_provider_new ();
  display = gdk_display_get_default ();
  screen = gdk_display_get_default_screen (display);

  gtk_style_context_add_provider_for_screen (screen,
                                             GTK_STYLE_PROVIDER(provider),
                                             GTK_STYLE_PROVIDER_PRIORITY_USER);

  gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (provider),
                                     " GtkWindow {\n"                         
                                     "   background-image: url(‘abstract-blue-02.jpg‘);\n"   
                                     "}\n", -1, NULL);
  g_object_unref (provider);
/*----------------------------------------------------------------------------------------------------------------------*/

  gtk_widget_show_all (window);
  gtk_main ();
return(0);
}