Mercurial > octave-nkf
view libgui/graphics/GenericEventNotify.h @ 20551:79eb0746b21f
Fix segfault when hovering a Qt figure while it's being drawn (bug #45540)
* Canvas.cc (Canvas::canvasMouseMoveEvent): ensure the QtHandles::Figure object is built from a figure object and is non null
* Canvas.cc (Canvas::canvasMouseMoveEvent): add a FIXME note
author | Pantxo Diribarne <pantxo.diribarne@gmail.com> |
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date | Mon, 07 Sep 2015 19:28:29 +0200 |
parents | f0e61a67ad9f |
children |
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/* Copyright (C) 2011-2015 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 <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* xparent) : B (xparent), GenericEventNotifySender () { } \ ~ T (void) { } \ \ bool event (QEvent* evt) \ { \ bool result = true; \ if (! notifyReceiversBefore (this, evt)) \ result = B::event (evt); \ notifyReceiversAfter (this, evt); \ return result; \ } \ } }; #endif