/****************************************************************************

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** 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

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****************************************************************************/

#include "qmouselinuxinput_qws.h"

#include <QScreen>

#include <QSocketNotifier>

#include <qplatformdefs.h>

#include <private/qcore_unix_p.h> // overrides QT_OPEN

#include <errno.h>

#include <linux/input.h>

QT_BEGIN_NAMESPACE

class QWSLinuxInputMousePrivate : public QObject

{

    Q_OBJECT

public:

    QWSLinuxInputMousePrivate(QWSLinuxInputMouseHandler *, const QString &);

    ~QWSLinuxInputMousePrivate();

    void enable(bool on);

private Q_SLOTS:

    void readMouseData();

private:

    QWSLinuxInputMouseHandler *m_handler;

    QSocketNotifier *          m_notify;

    int                        m_fd;

    int                        m_x, m_y;

    int                        m_buttons;

};

QWSLinuxInputMouseHandler::QWSLinuxInputMouseHandler(const QString &device)

    : QWSCalibratedMouseHandler(device)

{

    d = new QWSLinuxInputMousePrivate(this, device);

}

QWSLinuxInputMouseHandler::~QWSLinuxInputMouseHandler()

{

    delete d;

}

void QWSLinuxInputMouseHandler::suspend()

{

    d->enable(false);

}

void QWSLinuxInputMouseHandler::resume()

{

    d->enable(true);

}

QWSLinuxInputMousePrivate::QWSLinuxInputMousePrivate(QWSLinuxInputMouseHandler *h, const QString &device)

    : m_handler(h), m_notify(0), m_x(0), m_y(0), m_buttons(0)

{

    setObjectName(QLatin1String("LinuxInputSubsystem Mouse Handler"));

    QString dev = QLatin1String("/dev/input/event0");

    if (device.startsWith(QLatin1String("/dev/")))

        dev = device;

    m_fd = QT_OPEN(dev.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);

    if (m_fd >= 0) {

        m_notify = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);

        connect(m_notify, SIGNAL(activated(int)), this, SLOT(readMouseData()));

    } else {

        qWarning("Cannot open mouse input device '%s': %s", qPrintable(dev), strerror(errno));

        return;

    }

}

QWSLinuxInputMousePrivate::~QWSLinuxInputMousePrivate()

{

    if (m_fd >= 0)

        QT_CLOSE(m_fd);

}

void QWSLinuxInputMousePrivate::enable(bool on)

{

    if (m_notify)

        m_notify->setEnabled(on);

}

void QWSLinuxInputMousePrivate::readMouseData()

{

    if (!qt_screen)

        return;

    struct ::input_event buffer[32];

    int n = 0;

    forever {

        n = QT_READ(m_fd, reinterpret_cast<char *>(buffer) + n, sizeof(buffer) - n);

        if (n == 0) {

            qWarning("Got EOF from the input device.");

            return;

        } else if (n < 0 && (errno != EINTR && errno != EAGAIN)) {

            qWarning("Could not read from input device: %s", strerror(errno));

            return;

        } else if (n % sizeof(buffer[0]) == 0) {

            break;

        }

    }

    n /= sizeof(buffer[0]);

    for (int i = 0; i < n; ++i) {

        struct ::input_event *data = &buffer[i];

        bool unknown = false;

        if (data->type == EV_ABS) {

            if (data->code == ABS_X) {

                m_x = data->value;

            } else if (data->code == ABS_Y) {

                m_y = data->value;

            } else {

                unknown = true;

            }

        } else if (data->type == EV_REL) {

            if (data->code == REL_X) {

                m_x += data->value;

            } else if (data->code == REL_Y) {

                m_y += data->value;

            } else {

                unknown = true;

            }

        } else if (data->type == EV_KEY && data->code == BTN_TOUCH) {

            m_buttons = data->value ? Qt::LeftButton : 0;

        } else if (data->type == EV_KEY) {

            int button = 0;

            switch (data->code) {

            case BTN_LEFT: button = Qt::LeftButton; break;

            case BTN_MIDDLE: button = Qt::MidButton; break;

            case BTN_RIGHT: button = Qt::RightButton; break;

            }

            if (data->value)

                m_buttons |= button;

            else

                m_buttons &= ~button;

        } else if (data->type == EV_SYN && data->code == SYN_REPORT) {

            QPoint pos(m_x, m_y);

            pos = m_handler->transform(pos);

            m_handler->limitToScreen(pos);

            m_handler->mouseChanged(pos, m_buttons);

        } else if (data->type == EV_MSC && data->code == MSC_SCAN) {

            // kernel encountered an unmapped key - just ignore it

            continue;

        } else {

            unknown = true;

        }

        if (unknown) {

            qWarning("unknown mouse event type=%x, code=%x, value=%x", data->type, data->code, data->value);

        }

    }

}

QT_END_NAMESPACE

#include "qmouselinuxinput_qws.moc"