GTK+设置控件背景图片

void update_widget_bg(GtkWidget *widget, const gchar *img_file)
{        
GtkStyle *style;      
GdkPixbuf *pixbuf;        
GdkPixmap *pixmap;      
gint width, height;     
 
pixbuf = gdk_pixbuf_new_from_file(img_file, NULL);     
width = gdk_pixbuf_get_width(pixbuf);    
height = gdk_pixbuf_get_height(pixbuf);     
pixmap = gdk_pixmap_new(NULL, width, height, 24);    
gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, NULL, 0);
style = gtk_style_copy(GTK_WIDGET (widget)->style);     
 
if (style->bg_pixmap[GTK_STATE_NORMAL])         
    g_object_unref(style->bg_pixmap[GTK_STATE_NORMAL]);     
 
style->bg_pixmap[GTK_STATE_NORMAL] = g_object_ref(pixmap);     
style->bg_pixmap[GTK_STATE_ACTIVE] = g_object_ref(pixmap);
style->bg_pixmap[GTK_STATE_PRELIGHT] = g_object_ref(pixmap);
style->bg_pixmap[GTK_STATE_SELECTED] = g_object_ref(pixmap);
style->bg_pixmap[GTK_STATE_INSENSITIVE] = g_object_ref(pixmap);
gtk_widget_set_style(GTK_WIDGET (widget), style);
g_object_unref(style);

}