The GtkRadiant sources as originally released under the GPL license.

plugins/entity/filters.h

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+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_FILTERS_H)
+#define INCLUDED_FILTERS_H
+
+#include "ifilter.h"
+
+#include "generic/callback.h"
+#include "scenelib.h"
+
+class Entity;
+
+class EntityFilter
+{
+public:
+  virtual bool filter(const Entity& entity) const = 0;
+};
+
+bool entity_filtered(Entity& entity);
+void add_entity_filter(EntityFilter& filter, int mask, bool invert = false);
+
+class ClassnameFilter : public Filterable
+{
+  scene::Node& m_node;
+public:
+  Entity& m_entity;
+
+  ClassnameFilter(Entity& entity, scene::Node& node) : m_node(node), m_entity(entity)
+  {
+  }
+  ~ClassnameFilter()
+  {
+  }
+
+  void instanceAttach()
+  {
+    GlobalFilterSystem().registerFilterable(*this);
+  }
+  void instanceDetach()
+  {
+    GlobalFilterSystem().unregisterFilterable(*this);
+  }
+
+  void updateFiltered()
+  {
+    if(entity_filtered(m_entity))
+    {
+      m_node.enable(scene::Node::eFiltered);
+    }
+    else
+    {
+      m_node.disable(scene::Node::eFiltered);
+    }
+  }
+
+  void classnameChanged(const char* value)
+  {
+    updateFiltered();
+  }
+  typedef MemberCaller1<ClassnameFilter, const char*, &ClassnameFilter::classnameChanged> ClassnameChangedCaller;
+};
+
+#endif