The GtkRadiant sources as originally released under the GPL license.

radiant/windowobservers.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_WINDOWOBSERVERS_H)
+#define INCLUDED_WINDOWOBSERVERS_H
+
+#include "windowobserver.h"
+
+#include <gdk/gdktypes.h>
+
+#include "math/vector.h"
+
+class WindowObserver;
+void GlobalWindowObservers_add(WindowObserver* observer);
+typedef struct _GtkWidget GtkWidget;
+typedef struct _GtkWindow GtkWindow;
+void GlobalWindowObservers_connectWidget(GtkWidget* widget);
+void GlobalWindowObservers_connectTopLevel(GtkWindow* window);
+
+inline ButtonIdentifier button_for_button(unsigned int button)
+{
+  switch(button)
+  {
+  case 1:
+    return c_buttonLeft;
+  case 2:
+    return c_buttonMiddle;
+  case 3:
+    return c_buttonRight;
+  }
+  return c_buttonInvalid;
+}
+
+inline ModifierFlags modifiers_for_state(unsigned int state)
+{
+  ModifierFlags modifiers = c_modifierNone;
+  if(state & GDK_SHIFT_MASK)
+    modifiers |= c_modifierShift;
+  if(state & GDK_CONTROL_MASK)
+    modifiers |= c_modifierControl;
+  if(state & GDK_MOD1_MASK)
+    modifiers |= c_modifierAlt;
+  return modifiers;
+}
+
+inline WindowVector WindowVector_forDouble(double x, double y)
+{
+  return WindowVector(static_cast<float>(x), static_cast<float>(y));
+}
+
+#endif