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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
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