cssnode: Split into 3 objects

- GtkCssWidgetNode
  for style contexts owned by a widget
- GtkCssPathNode
  for style contexts using a GtkWidgetPath
- GtkCssTransientNode
  for nodes created with gtk_style_context_save()/restore()

gtk/gtkcsspathnode.c

@@ -0,0 +1,89 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2014 Benjamin Otte <otte@gnome.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gtkcsspathnodeprivate.h"
+#include "gtkprivate.h"
+
+G_DEFINE_TYPE (GtkCssPathNode, gtk_css_path_node, GTK_TYPE_CSS_NODE)
+
+static GtkWidgetPath *
+gtk_css_path_node_real_create_widget_path (GtkCssNode *node)
+{
+  GtkCssPathNode *path_node = GTK_CSS_PATH_NODE (node);
+
+  if (path_node->path == NULL)
+    return gtk_widget_path_new ();
+
+  return gtk_widget_path_copy (path_node->path);
+}
+
+static const GtkWidgetPath *
+gtk_css_path_node_real_get_widget_path (GtkCssNode *node)
+{
+  GtkCssPathNode *path_node = GTK_CSS_PATH_NODE (node);
+
+  return path_node->path;
+}
+
+static void
+gtk_css_path_node_class_init (GtkCssPathNodeClass *klass)
+{
+  GtkCssNodeClass *node_class = GTK_CSS_NODE_CLASS (klass);
+
+  node_class->create_widget_path = gtk_css_path_node_real_create_widget_path;
+  node_class->get_widget_path = gtk_css_path_node_real_get_widget_path;
+}
+
+static void
+gtk_css_path_node_init (GtkCssPathNode *cssnode)
+{
+}
+
+GtkCssNode *
+gtk_css_path_node_new (void)
+{
+  return g_object_new (GTK_TYPE_CSS_PATH_NODE, NULL);
+}
+
+void
+gtk_css_path_node_set_widget_path (GtkCssPathNode *node,
+                                   GtkWidgetPath  *path)
+{
+  gtk_internal_return_if_fail (GTK_IS_CSS_PATH_NODE (node));
+
+  if (node->path == path)
+    return;
+
+  if (node->path)
+    gtk_widget_path_unref (node->path);
+
+  if (path)
+    gtk_widget_path_ref (path);
+
+  node->path = path;
+}
+
+GtkWidgetPath *
+gtk_css_path_node_get_widget_path (GtkCssPathNode *node)
+{
+  gtk_internal_return_val_if_fail (GTK_IS_CSS_PATH_NODE (node), NULL);
+
+  return node->path;
+}
+