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/****************************************************************************
**
** Copyright (C) 2015 Paul Lemire (paul.lemire350@gmail.com)
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "qeventfilterservice_p.h"
#include <QtCore/QObject>
#include <Qt3DCore/private/qabstractserviceprovider_p.h>
#include <algorithm>
#include <vector>
QT_BEGIN_NAMESPACE
namespace {
struct FilterPriorityPair
{
QObject *filter;
int priority;
};
const auto byPriority = [](const FilterPriorityPair &a, const FilterPriorityPair &b) noexcept
{
return a.priority < b.priority;
};
}
Q_DECLARE_TYPEINFO(FilterPriorityPair, Q_PRIMITIVE_TYPE);
namespace Qt3DCore {
namespace {
class InternalEventListener : public QObject
{
Q_OBJECT
public:
explicit InternalEventListener(QEventFilterServicePrivate *filterService, QObject *parent = nullptr);
bool eventFilter(QObject *obj, QEvent *e) final;
QEventFilterServicePrivate* m_filterService;
};
} // anonymous
class QEventFilterServicePrivate : public QAbstractServiceProviderPrivate
{
public:
QEventFilterServicePrivate()
: QAbstractServiceProviderPrivate(QServiceLocator::EventFilterService, QStringLiteral("Default event filter service implementation"))
{}
Q_DECLARE_PUBLIC(QEventFilterService)
void registerEventFilter(QObject *eventFilter, int priority)
{
FilterPriorityPair fpPair;
fpPair.filter = eventFilter;
fpPair.priority = priority;
const auto it = std::lower_bound(m_eventFilters.begin(), m_eventFilters.end(), fpPair, byPriority);
if (it == m_eventFilters.end() || it->priority != priority)
m_eventFilters.insert(it, std::move(fpPair));
}
void unregisterEventFilter(QObject *eventFilter)
{
for (auto it = m_eventFilters.begin(), end = m_eventFilters.end(); it != end; ++it) {
if (it->filter == eventFilter) {
m_eventFilters.erase(it);
return;
}
}
}
QScopedPointer<InternalEventListener> m_eventDispatcher;
std::vector<FilterPriorityPair> m_eventFilters;
};
/* !\internal
\class Qt3DCore::QEventFilterService
\inmodule Qt3DCore
\brief Allows to register event filters with a priority.
The QEventFilterService class allows registering prioritized event filters.
Events are dispatched to the event filter with the highest priority first,
and then propagates to lower priority event filters if the event wasn't
accepted.
*/
QEventFilterService::QEventFilterService()
: QAbstractServiceProvider(*new QEventFilterServicePrivate())
{
}
QEventFilterService::~QEventFilterService()
{
}
// Note: event filters can only be registered to QObject in the same thread
void QEventFilterService::initialize(QObject *eventSource)
{
Q_D(QEventFilterService);
if (eventSource == nullptr) {
d->m_eventDispatcher.reset();
} else {
d->m_eventDispatcher.reset(new InternalEventListener(d));
eventSource->installEventFilter(d->m_eventDispatcher.data());
}
}
void QEventFilterService::shutdown(QObject *eventSource)
{
Q_D(QEventFilterService);
if (eventSource && d->m_eventDispatcher.data())
eventSource->removeEventFilter(d->m_eventDispatcher.data());
}
void QEventFilterService::registerEventFilter(QObject *eventFilter, int priority)
{
Q_D(QEventFilterService);
d->registerEventFilter(eventFilter, priority);
}
void QEventFilterService::unregisterEventFilter(QObject *eventFilter)
{
Q_D(QEventFilterService);
d->unregisterEventFilter(eventFilter);
}
namespace{
InternalEventListener::InternalEventListener(QEventFilterServicePrivate *filterService, QObject *parent)
: QObject(parent),
m_filterService(filterService)
{
}
bool InternalEventListener::eventFilter(QObject *obj, QEvent *e)
{
for (auto i = m_filterService->m_eventFilters.size(); i > 0; --i) {
const FilterPriorityPair &fPPair = m_filterService->m_eventFilters[i - 1];
if (fPPair.filter->eventFilter(obj, e))
return true;
}
return false;
}
}
} // Qt3DCore
QT_END_NAMESPACE
#include "qeventfilterservice.moc"
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