Mercurial > octave
view libgui/graphics/GenericEventNotify.h @ 25054:6652d3823428 stable
maint: Update copyright dates in all source files.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 30 Mar 2018 09:19:05 -0400 |
parents | 194eb4bd202b |
children | 00f796120a6d |
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/* Copyright (C) 2011-2018 Michael Goffioul 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; namespace QtHandles { class GenericEventNotifyReceiver; class GenericEventNotifySender { public: GenericEventNotifySender (void) : m_receivers () { } virtual ~GenericEventNotifySender (void) = 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 (void) { } virtual ~GenericEventNotifyReceiver (void) = 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) { 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 *xparent) : B (xparent), GenericEventNotifySender () { } \ ~ T (void) = default; \ \ bool event (QEvent *evt) \ { \ bool result = true; \ if (! notifyReceiversBefore (this, evt)) \ result = B::event (evt); \ notifyReceiversAfter (this, evt); \ return result; \ } \ } }; #endif