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/gtkcsswidgetnode.c

@@ -0,0 +1,93 @@
+/* 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 "gtkcsswidgetnodeprivate.h"
+#include "gtkprivate.h"
+#include "gtkwidgetprivate.h"
+
+G_DEFINE_TYPE (GtkCssWidgetNode, gtk_css_widget_node, GTK_TYPE_CSS_NODE)
+
+static GtkWidgetPath *
+gtk_css_widget_node_create_widget_path (GtkCssNode *node)
+{
+  GtkCssWidgetNode *widget_node = GTK_CSS_WIDGET_NODE (node);
+
+  if (widget_node->widget == NULL)
+    return gtk_widget_path_new ();
+
+  return _gtk_widget_create_path (widget_node->widget);
+}
+
+static const GtkWidgetPath *
+gtk_css_widget_node_get_widget_path (GtkCssNode *node)
+{
+  GtkCssWidgetNode *widget_node = GTK_CSS_WIDGET_NODE (node);
+
+  if (widget_node->widget == NULL)
+    return NULL;
+
+  return gtk_widget_get_path (widget_node->widget);
+}
+
+static void
+gtk_css_widget_node_class_init (GtkCssWidgetNodeClass *klass)
+{
+  GtkCssNodeClass *node_class = GTK_CSS_NODE_CLASS (klass);
+
+  node_class->create_widget_path = gtk_css_widget_node_create_widget_path;
+  node_class->get_widget_path = gtk_css_widget_node_get_widget_path;
+}
+
+static void
+gtk_css_widget_node_init (GtkCssWidgetNode *cssnode)
+{
+}
+
+GtkCssNode *
+gtk_css_widget_node_new (GtkWidget *widget)
+{
+  GtkCssWidgetNode *result;
+
+  gtk_internal_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
+
+  result = g_object_new (GTK_TYPE_CSS_WIDGET_NODE, NULL);
+  result->widget = widget;
+
+  return GTK_CSS_NODE (result);
+}
+
+void
+gtk_css_widget_node_widget_destroyed (GtkCssWidgetNode *node)
+{
+  gtk_internal_return_if_fail (GTK_IS_CSS_WIDGET_NODE (node));
+  gtk_internal_return_if_fail (node->widget != NULL);
+
+  node->widget = NULL;
+  /* Contents of this node are now undefined.
+   * So we don't clear the style or anything.
+   */
+}
+
+GtkWidget *
+gtk_css_widget_node_get_widget (GtkCssWidgetNode *node)
+{
+  gtk_internal_return_val_if_fail (GTK_IS_CSS_WIDGET_NODE (node), NULL);
+
+  return node->widget;
+}