--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/graphics/GenericEventNotify.h	Thu Feb 20 14:05:45 2014 -0500
@@ -0,0 +1,119 @@
+/*
+
+Copyright (C) 2011 Michael Goffioul.
+
+This file is part of QtHandles.
+
+Foobar 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 3 of the License, or
+(at your option) any later version.
+
+QtHandles 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#ifndef __GenericEventNotify_h__
+#define __GenericEventNotify_h__ 1
+
+#include <QSet>
+
+class QEvent;
+class QObject;
+class QWidget;
+
+//////////////////////////////////////////////////////////////////////////////
+
+namespace QtHandles
+{
+
+//////////////////////////////////////////////////////////////////////////////
+
+class GenericEventNotifyReceiver;
+
+class GenericEventNotifySender
+{
+public:
+  GenericEventNotifySender (void) : m_receivers () { }
+  virtual ~GenericEventNotifySender (void) { }
+
+  void addReceiver (GenericEventNotifyReceiver* r)
+    { m_receivers.insert (r); }
+
+  void removeReceiver (GenericEventNotifyReceiver* r)
+    { m_receivers.remove (r); }
+
+protected:
+  bool notifyReceiversBefore (QObject* obj, QEvent* evt);
+  void notifyReceiversAfter (QObject* obj, QEvent* evt);
+
+private:
+  QSet<GenericEventNotifyReceiver*> m_receivers;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+class GenericEventNotifyReceiver
+{
+public:
+  GenericEventNotifyReceiver (void) { }
+  virtual ~GenericEventNotifyReceiver (void) { }
+
+  virtual bool eventNotifyBefore (QObject* obj, QEvent* evt) = 0;
+  virtual void eventNotifyAfter (QObject* obj, QEvent* evt) = 0;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+inline
+bool GenericEventNotifySender::notifyReceiversBefore (QObject* obj,
+                                                      QEvent* evt)
+{
+  foreach (GenericEventNotifyReceiver* r, m_receivers)
+    if (r->eventNotifyBefore (obj, evt))
+      return true;
+  return false;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+inline
+void GenericEventNotifySender::notifyReceiversAfter (QObject* obj,
+                                                     QEvent* evt)
+{
+  foreach (GenericEventNotifyReceiver* r, m_receivers)
+    r->eventNotifyAfter (obj, evt);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+#define DECLARE_GENERICEVENTNOTIFY_SENDER(T,B) \
+class T : public B, public GenericEventNotifySender \
+{ \
+public: \
+  T (QWidget* parent) : B (parent), GenericEventNotifySender () { } \
+  ~ T (void) { } \
+\
+  bool event (QEvent* evt) \
+    { \
+      bool result = true; \
+      if (! notifyReceiversBefore (this, evt)) \
+        result = B::event (evt); \
+      notifyReceiversAfter (this, evt); \
+      return result; \
+    } \
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+#endif