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);

}