static void
gb_editor_view_actions_preview (GSimpleAction *action,
                                GVariant      *param,
                                gpointer       user_data)
{
  GbEditorView *self = user_data;
  GtkSourceLanguage *language;
  const gchar *lang_id = NULL;
  g_autoptr(GbDocument) document = NULL;

  g_assert (GB_IS_EDITOR_VIEW (self));

  language = gtk_source_buffer_get_language (GTK_SOURCE_BUFFER (self->document));
  if (!language)
    return;

  lang_id = gtk_source_language_get_id (language);
  if (!lang_id)
    return;

#if 0
  if (g_str_equal (lang_id, "html"))
    {
      document = g_object_new (GB_TYPE_HTML_DOCUMENT,
                               "buffer", self->document,
                               NULL);
    }
  else if (g_str_equal (lang_id, "markdown"))
    {
      document = g_object_new (GB_TYPE_HTML_DOCUMENT,
                               "buffer", self->document,
                               NULL);
      gb_html_document_set_transform_func (GB_HTML_DOCUMENT (document),
                                           gb_html_markdown_transform);
    }
#endif

  if (document)
    {
      GtkWidget *parent = gtk_widget_get_parent (GTK_WIDGET (self));

      while (parent && !GB_IS_VIEW_GRID (parent))
        parent = gtk_widget_get_parent (parent);

      if (parent == NULL)
        {
          while (parent && !GB_IS_VIEW_STACK (parent))
            parent = gtk_widget_get_parent (parent);
          g_assert (GB_IS_VIEW_STACK (parent));
          gb_view_stack_focus_document (GB_VIEW_STACK (parent), document);
          return;
        }

      g_assert (GB_IS_VIEW_GRID (parent));
      gb_view_grid_focus_document (GB_VIEW_GRID (parent), document);
    }
}
static void
gb_view_stack_set_property (GObject      *object,
                            guint         prop_id,
                            const GValue *value,
                            GParamSpec   *pspec)
{
  GbViewStack *self = GB_VIEW_STACK (object);

  switch (prop_id)
    {
    case PROP_ACTIVE_VIEW:
      gb_view_stack_set_active_view (self, g_value_get_object (value));
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}