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// Copyright (C) 2012 Research In Motion
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qqnxbuttoneventnotifier.h"
#include <QtGui/QGuiApplication>
#include <qpa/qwindowsysteminterface.h>
#include <QtCore/qhash.h>
#include <QtCore/qbytearray.h>
#include <QtCore/QDebug>
#include <QtCore/QMetaEnum>
#include <QtCore/QSocketNotifier>
#include <QtCore/private/qcore_unix_p.h>
#if defined(QQNXBUTTON_DEBUG)
#define qButtonDebug qDebug
#else
#define qButtonDebug QT_NO_QDEBUG_MACRO
#endif
QT_BEGIN_NAMESPACE
const char *QQnxButtonEventNotifier::ppsPath = "/pps/system/buttons/status";
const size_t QQnxButtonEventNotifier::ppsBufferSize = 256;
QQnxButtonEventNotifier::QQnxButtonEventNotifier(QObject *parent)
: QObject(parent),
m_fd(-1),
m_readNotifier(0)
{
// Set initial state of buttons to ButtonUp and
// fetch the new button ids
int enumeratorIndex = QQnxButtonEventNotifier::staticMetaObject.indexOfEnumerator(QByteArrayLiteral("ButtonId"));
QMetaEnum enumerator = QQnxButtonEventNotifier::staticMetaObject.enumerator(enumeratorIndex);
m_buttonKeys.reserve(ButtonCount - bid_minus);
for (int buttonId = bid_minus; buttonId < ButtonCount; ++buttonId) {
m_buttonKeys.append(enumerator.valueToKey(buttonId));
m_state[buttonId] = ButtonUp;
}
}
QQnxButtonEventNotifier::~QQnxButtonEventNotifier()
{
close();
}
void QQnxButtonEventNotifier::start()
{
qButtonDebug("starting hardware button event processing");
if (m_fd != -1)
return;
// Open the pps interface
errno = 0;
m_fd = qt_safe_open(ppsPath, O_RDONLY);
if (m_fd == -1) {
#if defined (QQNXBUTTON_DEBUG)
qWarning("QQNX: failed to open buttons pps, errno=%d", errno);
#endif
return;
}
m_readNotifier = new QSocketNotifier(m_fd, QSocketNotifier::Read);
QObject::connect(m_readNotifier, SIGNAL(activated(QSocketDescriptor)), this, SLOT(updateButtonStates()));
qButtonDebug("successfully connected to Navigator. fd = %d", m_fd);
}
void QQnxButtonEventNotifier::updateButtonStates()
{
// Allocate buffer for pps data
char buffer[ppsBufferSize];
// Attempt to read pps data
errno = 0;
int bytes = qt_safe_read(m_fd, buffer, ppsBufferSize - 1);
qButtonDebug() << "Read" << bytes << "bytes of data";
if (bytes == -1) {
qWarning("QQNX: failed to read hardware buttons pps object, errno=%d", errno);
return;
}
// We seem to get a spurious read notification after the real one. Ignore it
if (bytes == 0)
return;
// Ensure data is null terminated
buffer[bytes] = '\0';
qButtonDebug("received PPS message:\n%s", buffer);
// Process received message
QByteArray ppsData = QByteArray::fromRawData(buffer, bytes);
QHash<QByteArray, QByteArray> fields;
if (!parsePPS(ppsData, &fields))
return;
// Update our state and inject key events as needed
for (int buttonId = bid_minus; buttonId < ButtonCount; ++buttonId) {
// Extract the new button state
QByteArray key = m_buttonKeys.at(buttonId);
ButtonState newState = (fields.value(key) == "b_up" ? ButtonUp : ButtonDown);
// If state has changed, update our state and inject a keypress event
if (m_state[buttonId] != newState) {
qButtonDebug() << "Hardware button event: button =" << key << "state =" << fields.value(key);
m_state[buttonId] = newState;
// Is it a key press or key release event?
QEvent::Type type = (newState == ButtonDown) ? QEvent::KeyPress : QEvent::KeyRelease;
Qt::Key key;
switch (buttonId) {
case bid_minus:
key = Qt::Key_VolumeDown;
break;
case bid_playpause:
key = Qt::Key_Play;
break;
case bid_plus:
key = Qt::Key_VolumeUp;
break;
case bid_power:
key = Qt::Key_PowerDown;
break;
default:
qButtonDebug("Unknown hardware button");
continue;
}
// No modifiers
Qt::KeyboardModifiers modifier = Qt::NoModifier;
// Post the event
QWindowSystemInterface::handleKeyEvent(QGuiApplication::focusWindow(), type, key, modifier);
}
}
}
void QQnxButtonEventNotifier::close()
{
delete m_readNotifier;
m_readNotifier = 0;
if (m_fd != -1) {
qt_safe_close(m_fd);
m_fd = -1;
}
}
bool QQnxButtonEventNotifier::parsePPS(const QByteArray &ppsData, QHash<QByteArray, QByteArray> *messageFields) const
{
// tokenize pps data into lines
QList<QByteArray> lines = ppsData.split('\n');
// validate pps object
if (lines.size() == 0 || !lines.at(0).contains(QByteArrayLiteral("@status"))) {
qWarning("QQNX: unrecognized pps object, data=%s", ppsData.constData());
return false;
}
// parse pps object attributes and extract values
for (int i = 1; i < lines.size(); i++) {
// tokenize current attribute
const QByteArray &attr = lines.at(i);
qButtonDebug() << "attr=" << attr;
int doubleColon = attr.indexOf(QByteArrayLiteral("::"));
if (doubleColon == -1) {
// abort - malformed attribute
continue;
}
QByteArray key = attr.left(doubleColon);
QByteArray value = attr.mid(doubleColon + 2);
messageFields->insert(key, value);
}
return true;
}
QT_END_NAMESPACE
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