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Diffstat (limited to 'src/3rdparty/phonon/mmf/ancestormovemonitor.cpp')
| -rw-r--r-- | src/3rdparty/phonon/mmf/ancestormovemonitor.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/3rdparty/phonon/mmf/ancestormovemonitor.cpp b/src/3rdparty/phonon/mmf/ancestormovemonitor.cpp new file mode 100644 index 0000000000..0447d57b45 --- /dev/null +++ b/src/3rdparty/phonon/mmf/ancestormovemonitor.cpp @@ -0,0 +1,175 @@ +/* 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/>. + +*/ + +#include "ancestormovemonitor.h" +#include "utils.h" +#include "videooutput.h" + +#include <QCoreApplication> + +QT_BEGIN_NAMESPACE + +using namespace Phonon::MMF; + +/*! \class MMF::AncestorMoveMonitor + \internal + \brief Class which installs a global event filter, and listens for move + events which may affect the absolute position of widgets registered with + the monitor + See QTBUG-4956 +*/ + +//----------------------------------------------------------------------------- +// Constructor / destructor +//----------------------------------------------------------------------------- + +AncestorMoveMonitor::AncestorMoveMonitor(QObject *parent) + : QObject(parent) +{ + QCoreApplication::instance()->installEventFilter(this); +} + +AncestorMoveMonitor::~AncestorMoveMonitor() +{ + QCoreApplication::instance()->removeEventFilter(this); +} + + +//----------------------------------------------------------------------------- +// Public functions +//----------------------------------------------------------------------------- + +void AncestorMoveMonitor::registerTarget(VideoOutput *target) +{ + TRACE_CONTEXT(AncestorMoveMonitor::registerTarget, EVideoInternal); + TRACE_ENTRY("target 0x%08x", target); + + // First un-register the target, in case this is being called as a result + // of re-parenting. This is not the most efficient way to update the + // target hash, but since this is not likely to be a frequent operation, + // simplicity is preferred over outright speed. In any case, re-parenting + // of the video widget leads to re-creation of native windows, which is + // likely to take far more processing than any implementation of this + // function. + unRegisterTarget(target); + + QWidget *ancestor = target->parentWidget(); + while(ancestor) { + const Hash::iterator it = m_hash.find(ancestor); + if(m_hash.end() == it) { + TargetList targetList; + targetList.append(target); + m_hash.insert(ancestor, targetList); + } else { + TargetList& targetList = it.value(); + Q_ASSERT(targetList.indexOf(target) == -1); + targetList.append(target); + } + ancestor = ancestor->parentWidget(); + } + + dump(); + + TRACE_EXIT_0(); +} + +void AncestorMoveMonitor::unRegisterTarget(VideoOutput *target) +{ + TRACE_CONTEXT(AncestorMoveMonitor::unRegisterTarget, EVideoInternal); + TRACE_ENTRY("target 0x%08x", target); + + Hash::iterator it = m_hash.begin(); + while(it != m_hash.end()) { + TargetList& targetList = it.value(); + const int index = targetList.indexOf(target); + if(index != -1) + targetList.removeAt(index); + if(targetList.count()) + ++it; + else + it = m_hash.erase(it); + } + + dump(); + + TRACE_EXIT_0(); +} + +bool AncestorMoveMonitor::eventFilter(QObject *watched, QEvent *event) +{ + TRACE_CONTEXT(AncestorMoveMonitor::eventFilter, EVideoInternal); + + if(event->type() == QEvent::Move || event->type() == QEvent::ParentChange) { + + //TRACE_ENTRY("watched 0x%08x event.type %d", watched, event->type()); + + const Hash::const_iterator it = m_hash.find(watched); + if(it != m_hash.end()) { + const TargetList& targetList = it.value(); + VideoOutput* target = 0; + foreach(target, targetList) { + switch (event->type()) { + + case QEvent::Move: + // Notify the target that its ancestor has moved + target->ancestorMoved(); + break; + + case QEvent::ParentChange: + // Update ancestor list for the target + registerTarget(target); + break; + + default: + Q_ASSERT(false); + } + } + } + + //TRACE_EXIT_0(); + } + + // The event is never consumed by this filter + return false; +} + +//----------------------------------------------------------------------------- +// Private functions +//----------------------------------------------------------------------------- + +void AncestorMoveMonitor::dump() +{ +#ifndef QT_NO_DEBUG + TRACE_CONTEXT(AncestorMoveMonitor::dump, EVideoInternal); + for(Hash::const_iterator it = m_hash.begin(); + it != m_hash.end(); ++it) { + const QObject *ancestor = it.key(); + TRACE("ancestor 0x%08x", ancestor); + const TargetList& targetList = it.value(); + VideoOutput* target = 0; + foreach(target, targetList) { + TRACE(" target 0x%08x", target); + } + } +#endif +} + + + +QT_END_NAMESPACE + |