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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#include "qmousetslib_qws.h"

#if !defined(QT_NO_QWS_MOUSE_TSLIB) || defined(QT_PLUGIN)

#include <QtCore/qregexp.h>

#include <QtCore/qstringlist.h>

#include "qsocketnotifier.h"

#include "qscreen_qws.h"

#include <tslib.h>

#include <errno.h>

QT_BEGIN_NAMESPACE

#ifdef TSLIBMOUSEHANDLER_DEBUG

#  include <QtCore/QDebug>

#endif

/*!

    \internal

    \class QWSTslibMouseHandler

    \ingroup qws

    \brief The QWSTslibMouseHandler class implements a mouse driver

    for the Universal Touch Screen Library, tslib.

    QWSTslibMouseHandler inherits the QWSCalibratedMouseHandler class,

    providing calibration and noise reduction functionality in

    addition to generating mouse events, for devices using the

    Universal Touch Screen Library.

    To be able to compile this mouse handler, \l{Qt for Embedded Linux}

    must be configured with the \c -qt-mouse-tslib option, see the

    \l{Pointer Handling} documentation for details. In addition, the tslib

    headers and library must be present in the build environment.  The

    tslib sources can be downloaded from \l

    {http://tslib.berlios.de/}.  Use the \c -L and \c -I options

    with \c configure to explicitly specify the location of the

    library and its headers:

    \snippet doc/src/snippets/code/src_gui_embedded_qmousetslib_qws.cpp 0

    In order to use this mouse handler, tslib must also be correctly

    installed on the target machine. This includes providing a \c

    ts.conf configuration file and setting the necessary environment

    variables, see the README file provided with tslib for details.

    The ts.conf file will usually contain the following two lines

    \snippet doc/src/snippets/code/src_gui_embedded_qmousetslib_qws.cpp 1

    To make \l{Qt for Embedded Linux} explicitly choose the tslib mouse

    handler, set the QWS_MOUSE_PROTO environment variable.

    \sa {Pointer Handling}, {Qt for Embedded Linux}

*/

class QWSTslibMouseHandlerPrivate : public QObject

{

    Q_OBJECT

public:

    QWSTslibMouseHandlerPrivate(QWSTslibMouseHandler *h,

                                const QString &device);

    ~QWSTslibMouseHandlerPrivate();

    void suspend();

    void resume();

    void calibrate(const QWSPointerCalibrationData *data);

    void clearCalibration();

private:

    QWSTslibMouseHandler *handler;

    struct tsdev *dev;

    QSocketNotifier *mouseNotifier;

    int jitter_limit;

    struct ts_sample lastSample;

    bool wasPressed;

    int lastdx;

    int lastdy;

    bool calibrated;

    QString devName;

    bool open();

    void close();

    inline bool get_sample(struct ts_sample *sample);

private slots:

    void readMouseData();

};

QWSTslibMouseHandlerPrivate::QWSTslibMouseHandlerPrivate(QWSTslibMouseHandler *h,

                                                         const QString &device)

    : handler(h), dev(0), mouseNotifier(0), jitter_limit(3)

{

    QStringList args = device.split(QLatin1Char(':'), QString::SkipEmptyParts);

    QRegExp jitterRegex(QLatin1String("^jitter_limit=(\\d+)$"));

    int index = args.indexOf(jitterRegex);

    if (index >= 0) {

        jitter_limit = jitterRegex.cap(1).toInt();

        args.removeAt(index);

    }

    devName = args.join(QString());

    if (devName.isNull()) {

        const char *str = getenv("TSLIB_TSDEVICE");

        if (str)

            devName = QString::fromLocal8Bit(str);

    }

    if (devName.isNull())

        devName = QLatin1String("/dev/ts");

    if (!open())

        return;

    calibrated = true;

    int fd = ts_fd(dev);

    mouseNotifier = new QSocketNotifier(fd, QSocketNotifier::Read, this);

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

    resume();

}

QWSTslibMouseHandlerPrivate::~QWSTslibMouseHandlerPrivate()

{

    close();

}

bool QWSTslibMouseHandlerPrivate::open()

{

    dev = ts_open(devName.toLocal8Bit().constData(), 1);

    if (!dev) {

        qCritical("QWSTslibMouseHandlerPrivate: ts_open() failed"

                  " with error: '%s'", strerror(errno));

        qCritical("Please check your tslib installation!");

        return false;

    }

    if (ts_config(dev)) {

        qCritical("QWSTslibMouseHandlerPrivate: ts_config() failed"

                  " with error: '%s'", strerror(errno));

        qCritical("Please check your tslib installation!");

        close();

        return false;

    }

    return true;

}

void QWSTslibMouseHandlerPrivate::close()

{

    if (dev)

        ts_close(dev);

}

void QWSTslibMouseHandlerPrivate::suspend()

{

    if (mouseNotifier)

        mouseNotifier->setEnabled(false);

}

void QWSTslibMouseHandlerPrivate::resume()

{

    memset(&lastSample, 0, sizeof(lastSample));

    wasPressed = false;

    lastdx = 0;

    lastdy = 0;

    if (mouseNotifier)

        mouseNotifier->setEnabled(true);

}

bool QWSTslibMouseHandlerPrivate::get_sample(struct ts_sample *sample)

{

    if (!calibrated)

        return (ts_read_raw(dev, sample, 1) == 1);

    return (ts_read(dev, sample, 1) == 1);

}

void QWSTslibMouseHandlerPrivate::readMouseData()

{

    if (!qt_screen)

        return;

    for(;;) {

        struct ts_sample sample = lastSample;

        bool pressed = wasPressed;

        // Fast return if there's no events.

        if (!get_sample(&sample))

            return;

        pressed = (sample.pressure > 0);

        // Only return last sample unless there's a press/release event.

        while (pressed == wasPressed) {

            if (!get_sample(&sample))

                break;

            pressed = (sample.pressure > 0);

        }

        // work around missing coordinates on mouse release in raw mode

        if (!calibrated && !pressed && sample.x == 0 && sample.y == 0) {

            sample.x = lastSample.x;

            sample.y = lastSample.y;

        }

        int dx = sample.x - lastSample.x;

        int dy = sample.y - lastSample.y;

        // Remove small movements in oppsite direction

        if (dx * lastdx < 0 && qAbs(dx) < jitter_limit) {

            sample.x = lastSample.x;

            dx = 0;

        }

        if (dy * lastdy < 0 && qAbs(dy) < jitter_limit) {

            sample.y = lastSample.y;

            dy = 0;

        }

        if (wasPressed == pressed && dx == 0 && dy == 0)

            return;

#ifdef TSLIBMOUSEHANDLER_DEBUG

        qDebug() << "last" << QPoint(lastSample.x, lastSample.y)

                 << "curr" << QPoint(sample.x, sample.y)

                 << "dx,dy" << QPoint(dx, dy)

                 << "ddx,ddy" << QPoint(dx*lastdx, dy*lastdy)

                 << "pressed" << wasPressed << pressed;

#endif

        lastSample = sample;

        wasPressed = pressed;

        if (dx != 0)

            lastdx = dx;

        if (dy != 0)

            lastdy = dy;

        const QPoint p(sample.x, sample.y);

        if (calibrated) {

            // tslib should do all the translation and filtering, so we send a

            // "raw" mouse event

            handler->QWSMouseHandler::mouseChanged(p, pressed);

        } else {

            handler->sendFiltered(p, pressed);

        }

    }

}

void QWSTslibMouseHandlerPrivate::clearCalibration()

{

    suspend();

    close();

    handler->QWSCalibratedMouseHandler::clearCalibration();

    calibrated = false;

    open();

    resume();

}

void QWSTslibMouseHandlerPrivate::calibrate(const QWSPointerCalibrationData *data)

{

    suspend();

    close();

    // default implementation writes to /etc/pointercal

    // using the same format as the tslib linear module.

    handler->QWSCalibratedMouseHandler::calibrate(data);

    calibrated = true;

    open();

    resume();

}

/*!

    \internal

*/

QWSTslibMouseHandler::QWSTslibMouseHandler(const QString &driver,

                                           const QString &device)

    : QWSCalibratedMouseHandler(driver, device)

{

    d = new QWSTslibMouseHandlerPrivate(this, device);

}

/*!

    \internal

*/

QWSTslibMouseHandler::~QWSTslibMouseHandler()

{

    delete d;

}

/*!

    \reimp

*/

void QWSTslibMouseHandler::suspend()

{

    d->suspend();

}

/*!

    \reimp

*/

void QWSTslibMouseHandler::resume()

{

    d->resume();

}

/*!

    \reimp

*/

void QWSTslibMouseHandler::clearCalibration()

{

    d->clearCalibration();

}

/*!

    \reimp

*/

void QWSTslibMouseHandler::calibrate(const QWSPointerCalibrationData *data)

{

    d->calibrate(data);

}

QT_END_NAMESPACE

#include "qmousetslib_qws.moc"

#endif //QT_NO_QWS_MOUSE_TSLIB