| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 Paul Lemire (paul.lemire350@gmail.com) |
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| ** This file is part of the Qt3D module of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #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" |