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/* This file is part of the KDE project.
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.
This library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PHONON_MMF_ANCESTORMOVEMONITOR_H
#define PHONON_MMF_ANCESTORMOVEMONITOR_H
#include <QObject>
#include <QHash>
#include <QList>
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace MMF
{
class DsaVideoOutput;
class AncestorMoveMonitor : public QObject
{
Q_OBJECT
public:
explicit AncestorMoveMonitor(QObject *parent);
~AncestorMoveMonitor();
/**
* Register target widget for notification.
*
* The widget receives an ancestorMoveEvent callback when a move event
* is delivered to any of its ancestors:
*
* If the target is already registered, this function causes its
* ancestor list to be updated - therefore it should be called when
* the target receives a ParentChange event.
*/
void registerTarget(DsaVideoOutput *target);
/**
* Remove target from the monitor.
*
* The target will no longer receive notification when move events are
* delivered to its ancestors.
*/
void unRegisterTarget(DsaVideoOutput *target);
protected:
/**
* Function which receives events from the global event filter.
*/
bool eventFilter(QObject *watched, QEvent *event);
void dump();
private:
/**
* List of registered target widgets which descend from a given
* ancestor.
*
* Note that the members of the list should be non-redundant; this
* invariant is checked in debug builds. Semantically, the value is
* therefore a set, however we use QList rather than QSet for
* efficiency of iteration.
*/
typedef QList<DsaVideoOutput *> TargetList;
/**
* Map from widget on which the move event occurs, to widgets which
* descend from it and therefore need to be notified.
*/
typedef QHash<QObject *, TargetList> Hash;
Hash m_hash;
};
}
}
QT_END_NAMESPACE
#endif // !PHONON_MMF_ANCESTORMOVEMONITOR_H
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