summaryrefslogtreecommitdiffstats
path: root/src/plugins/platforms/qnx/qqnxbuttoneventnotifier.cpp
blob: 2f531efd8b607c259e1f1524bebc2c9469fea6b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/***************************************************************************
**
** Copyright (C) 2012 Research In Motion
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qqnxbuttoneventnotifier.h"

#include <QtGui/QGuiApplication>
#include <qpa/qwindowsysteminterface.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

static const char *ppsPath = "/pps/system/buttons/status";
static const int 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);
    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() << Q_FUNC_INFO << "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) {
        qWarning("QQNX: failed to open buttons pps, errno=%d", errno);
        return;
    }

    m_readNotifier = new QSocketNotifier(m_fd, QSocketNotifier::Read);
    QObject::connect(m_readNotifier, SIGNAL(activated(int)), this, SLOT(updateButtonStates()));

    qButtonDebug() << Q_FUNC_INFO << "successfully connected to Navigator. fd =" << 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() << Q_FUNC_INFO << "received PPS message:\n" << 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) == QByteArrayLiteral("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() << Q_FUNC_INFO << "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