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+/****************************************************************************
+**
+** Copyright (C) 2019 BogDan Vatra <bogdan@kde.org>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtSensors module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SENSOREVENTQUEUE_H
+#define SENSOREVENTQUEUE_H
+
+#include "sensormanager.h"
+
+#include <functional>
+
+#include <QCoreApplication>
+#include <QEvent>
+#include <QSensorBackend>
+
+class FunctionEvent : public QEvent
+{
+public:
+ using Function = std::function<void()>;
+ enum {
+ FunctionEventType = User + 1
+ };
+ explicit FunctionEvent(const Function &function)
+ : QEvent(Type(FunctionEventType))
+ , m_function(function)
+ {}
+
+ void callFunction() const
+ {
+ m_function();
+ }
+private:
+ Function m_function;
+};
+
+class ThreadSafeSensorBackend : public QSensorBackend
+{
+public:
+ ThreadSafeSensorBackend(QSensor *sensor, QObject *parent = nullptr)
+ : QSensorBackend(sensor, parent)
+ , m_sensorManager(SensorManager::instance())
+ {}
+
+ // QObject interface
+ bool event(QEvent *event) override
+ {
+ if (event->type() == FunctionEvent::FunctionEventType) {
+ static_cast<FunctionEvent*>(event)->callFunction();
+ event->accept();
+ return true;
+ }
+ return QSensorBackend::event(event);
+ }
+protected:
+ QSharedPointer<SensorManager> m_sensorManager;
+};
+
+
+
+template <typename T>
+class SensorEventQueue : public ThreadSafeSensorBackend
+{
+public:
+ explicit SensorEventQueue(int androidSensorType, QSensor *sensor, QObject *parent = nullptr)
+ : ThreadSafeSensorBackend(sensor, parent)
+ {
+ setReading<T>(&m_reader);
+ m_sensorEventQueue = ASensorManager_createEventQueue(m_sensorManager->manager(), m_sensorManager->looper(), -1, &looperCallback, this);
+ setSensorType(androidSensorType);
+ }
+
+ ~SensorEventQueue() override
+ {
+ stop();
+ ASensorManager_destroyEventQueue(m_sensorManager->manager(), m_sensorEventQueue);
+ }
+
+ void setSensorType(int type)
+ {
+ bool started = m_started;
+ if (started)
+ stop();
+ m_sensor = ASensorManager_getDefaultSensor(m_sensorManager->manager(), type);
+ setDescription(m_sensorManager->description(m_sensor));
+ if (started)
+ start();
+ }
+
+ // QSensorBackend interface
+ void start() override
+ {
+ ASensorEventQueue_enableSensor(m_sensorEventQueue, m_sensor);
+ if (sensor()->dataRate() > 0)
+ ASensorEventQueue_setEventRate(m_sensorEventQueue, m_sensor, std::max(ASensor_getMinDelay(m_sensor), sensor()->dataRate()));
+ m_started = true;
+ }
+ void stop() override
+ {
+ ASensorEventQueue_disableSensor(m_sensorEventQueue, m_sensor);
+ m_started = false;
+ }
+ bool isFeatureSupported(QSensor::Feature feature) const override
+ {
+ switch (feature) {
+ case QSensor::SkipDuplicates:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+protected:
+ virtual void dataReceived(const ASensorEvent &event) = 0;
+ static int looperCallback(int /*fd*/, int /*events*/, void* data)
+ {
+ ASensorEvent sensorEvent;
+ auto self = reinterpret_cast<SensorEventQueue*>(data);
+ while (ASensorEventQueue_getEvents(self->m_sensorEventQueue, &sensorEvent, 1))
+ QCoreApplication::postEvent(self, new FunctionEvent{[=]{self->dataReceived(sensorEvent);}});
+
+ return 1; // 1 means keep receiving events
+ }
+
+protected:
+ T m_reader;
+ const ASensor *m_sensor = nullptr;
+ ASensorEventQueue* m_sensorEventQueue = nullptr;
+ bool m_started = false;
+};
+
+#endif // SENSOREVENTQUEUE_H