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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2024 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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.
//
// Octave 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 Octave; see the file COPYING. If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
#if ! defined (octave_GenericEventNotify_h)
#define octave_GenericEventNotify_h 1
#include <QSet>
class QEvent;
class QObject;
class QWidget;
OCTAVE_BEGIN_NAMESPACE(octave)
class GenericEventNotifyReceiver;
class GenericEventNotifySender
{
public:
GenericEventNotifySender () : m_receivers () { }
virtual ~GenericEventNotifySender () = default;
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 () { }
virtual ~GenericEventNotifyReceiver () = default;
virtual bool eventNotifyBefore (QObject *obj, QEvent *evt) = 0;
virtual void eventNotifyAfter (QObject *obj, QEvent *evt) = 0;
};
inline
bool GenericEventNotifySender::notifyReceiversBefore (QObject *obj,
QEvent *evt)
{
for (auto *r : m_receivers)
if (r->eventNotifyBefore (obj, evt))
return true;
return false;
}
inline
void GenericEventNotifySender::notifyReceiversAfter (QObject *obj,
QEvent *evt)
{
for (auto *r : m_receivers)
r->eventNotifyAfter (obj, evt);
}
OCTAVE_END_NAMESPACE(octave)
#define DECLARE_GENERICEVENTNOTIFY_SENDER(T,B) \
class T : public B, public GenericEventNotifySender \
{ \
public: \
T (QWidget *xparent) : B (xparent), GenericEventNotifySender () { } \
~ T () = default; \
\
bool event (QEvent *evt) \
{ \
bool result = true; \
if (! notifyReceiversBefore (this, evt)) \
result = B::event (evt); \
notifyReceiversAfter (this, evt); \
return result; \
} \
}
#endif
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