The GtkRadiant sources as originally released under the GPL license.

include/itoolbar.h

@@ -0,0 +1,66 @@
+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+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_IPLUGTOOLBAR_H)
+#define INCLUDED_IPLUGTOOLBAR_H
+
+#include <cstddef>
+#include "generic/constant.h"
+
+class IToolbarButton
+{
+public:
+  enum EType
+  {
+    eSpace,
+    eButton,
+    eToggleButton,
+    eRadioButton,
+  };
+
+  virtual const char* getImage() const = 0;
+  virtual const char* getText() const = 0;
+  virtual const char* getTooltip() const = 0;
+  virtual EType getType() const = 0;
+  virtual void activate() const = 0;
+};
+
+typedef std::size_t  (* PFN_TOOLBARBUTTONCOUNT)();
+typedef const IToolbarButton* (* PFN_GETTOOLBARBUTTON)(std::size_t index);
+
+struct _QERPlugToolbarTable
+{
+  INTEGER_CONSTANT(Version, 1);
+  STRING_CONSTANT(Name, "toolbar");
+
+  PFN_TOOLBARBUTTONCOUNT m_pfnToolbarButtonCount;
+  PFN_GETTOOLBARBUTTON   m_pfnGetToolbarButton;
+};
+
+template<typename Type>
+class Modules;
+typedef Modules<_QERPlugToolbarTable> ToolbarModules;
+
+template<typename Type>
+class ModulesRef;
+typedef ModulesRef<_QERPlugToolbarTable> ToolbarModulesRef;
+
+#endif