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/****************************************************************************
**
** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt for Native Client platform plugin.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qpeppereventdispatcher.h"
#include <QtCore/QDebug>
#include <QtCore/QCoreApplication>
Q_LOGGING_CATEGORY(QT_PLATFORM_PEPPER_EVENTDISPATHCER, "qt.platform.pepper.eventdispatcher");
QPepperEventDispatcher::QPepperEventDispatcher(QObject *parent)
: QUnixEventDispatcherQPA(parent)
, m_currentTimerSerial(0)
, m_messageLoop(pp::MessageLoop::GetCurrent())
, m_completionCallbackFactory(this)
, m_hasPendingProcessEvents(false)
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher()";
}
QPepperEventDispatcher::~QPepperEventDispatcher() {}
bool QPepperEventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)
{
bool processed = false;
#ifdef Q_OS_NACL_EMSCRIPTEN
// We need to give the control back to the browser due to lack of PTHREADS
// Limit the number of events that may be processed at the time
// TODO: Set maxProcessedEvents to the actual number of pending events, the real issue is that events may spawn new events
int maxProcessedEvents = 2;
int processedCount = 0;
do {
processed = QUnixEventDispatcherQPA::processEvents(flags);
processedCount += 1;
} while (processed && hasPendingEvents() && processedCount < maxProcessedEvents);
// Schedule a new processing loop if we still have events pending
if (hasPendingEvents()) {
scheduleProcessEvents();
}
#else
do {
processed = QUnixEventDispatcherQPA::processEvents(flags);
} while (processed && hasPendingEvents());
#endif
return true;
}
bool QPepperEventDispatcher::hasPendingEvents()
{
return QUnixEventDispatcherQPA::hasPendingEvents();
}
void QPepperEventDispatcher::registerTimer(int timerId, int interval, Qt::TimerType timerType,
QObject *object)
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher::registerTimer"
<< timerId << interval << object;
// Maintain QObject *-> Qt timer id mapping.
m_activeObjectTimers.insertMulti(object, timerId);
// Capture timer detail for later use
PepperTimerInfo timerInfo(timerId, interval, timerType, object);
m_timerDetails.insert(timerId, timerInfo);
startTimer(timerInfo);
}
bool QPepperEventDispatcher::unregisterTimer(int timerId)
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher::unregisterTimer"
<< timerId;
// Remove QObject -> Qt timer id mapping.
QObject *timerObject = m_timerDetails.value(timerId).object;
m_activeObjectTimers.remove(timerObject, timerId);
m_timerDetails.remove(timerId);
// Remove the timerId and the currently active serial.
int timerSerial = m_activeTimerSerials.value(timerId);
m_activeTimerSerials.remove(timerId);
m_activeTimerIds.remove(timerSerial);
return true;
}
bool QPepperEventDispatcher::unregisterTimers(QObject *object)
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher::unregisterTimers"
<< object;
// Find all active Qt timer ids for the given object and copy them to a list.
// (we will update the QObject * -> timerId hash while iterating the list later on)
QList<int> timerIds;
QMultiHash<QObject *, int>::iterator it = m_activeObjectTimers.find(object);
while (it != m_activeObjectTimers.end() && it.key() == object)
timerIds.append(it.value());
// Unregister each timer.
foreach (int timerId, timerIds)
unregisterTimer(timerId);
return true;
}
void QPepperEventDispatcher::flush()
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher::flush";
QUnixEventDispatcherQPA::flush();
}
void QPepperEventDispatcher::wakeUp()
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "QPepperEventDispatcher::wakeup";
scheduleProcessEvents();
}
void QPepperEventDispatcher::startTimer(PepperTimerInfo info)
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "startTimer" << info.timerId;
// Allocate a timer serial value for this startTimer call.
//
// Qt reuses timer id's. This means there is time for Qt to unregister a
// timer and register a new timer with the same id before our timer
// callback is called.
//
// This is compounded by single-shot timer behavior: We are not informed
// that a given timer is of the single-shot variant. Instead Qt will
// unregister it during the timer fire event.
//
// This is further compounded by the fact that the Pepper timer API is of
// the single-shot variant. After sending the timer event to Qt a decision
// has to be made if the timer should be rescheduled or not.
//
// In summary: To avoid confusing separate uses of the same timer id we
// give each call to CallOnMainThread a serial number which we can
// independently cancel.
//
++m_currentTimerSerial;
m_activeTimerIds[m_currentTimerSerial] = info.timerId;
m_activeTimerSerials[info.timerId] = m_currentTimerSerial;
m_messageLoop.PostWork(m_completionCallbackFactory.NewCallback(
&QPepperEventDispatcher::timerCallback, m_currentTimerSerial),
info.interval);
}
void QPepperEventDispatcher::timerCallback(int32_t result, int32_t timerSerial)
{
Q_UNUSED(result);
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "timerCallback" << timerSerial;
// The timer might have been unregistered. In that case don't fire.
if (!m_activeTimerIds.contains(timerSerial))
return;
// Get the timer info for the timerSerial/timerID.
int timerId = m_activeTimerIds.value(timerSerial);
const PepperTimerInfo &info = m_timerDetails.value(timerId);
// Send the timer event
QTimerEvent e(info.timerId);
QCoreApplication::sendEvent(info.object, &e);
processEvents();
// After running Qt and application code the timer may have been unregistered,
// and the timer id may have been reused. The timerSerial will hower not
// be reused; use that to determine if the timer is active.
if (m_activeTimerIds.contains(timerSerial))
startTimer(info);
// one serial number per callback, we are done with this one.
m_activeTimerIds.remove(timerSerial);
}
void QPepperEventDispatcher::scheduleProcessEvents()
{
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "scheduleProcessEvents" << m_hasPendingProcessEvents;
if (!m_hasPendingProcessEvents) {
m_hasPendingProcessEvents = true;
pp::CompletionCallback processEvents
= m_completionCallbackFactory.NewCallback(&QPepperEventDispatcher::processEventsCallback);
int32_t result = m_messageLoop.PostWork(processEvents);
if (result != PP_OK)
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "scheduleProcessEvents PostWork error"
<< result;
}
}
void QPepperEventDispatcher::processEventsCallback(int32_t status)
{
Q_UNUSED(status);
qCDebug(QT_PLATFORM_PEPPER_EVENTDISPATHCER) << "processEvents";
m_hasPendingProcessEvents = false;
processEvents();
}
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