qmousetslib_qws.cpp

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#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

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();
}

QWSTslibMouseHandler::QWSTslibMouseHandler(const QString &driver,
                                           const QString &device)
    : QWSCalibratedMouseHandler(driver, device)
{
    d = new QWSTslibMouseHandlerPrivate(this, device);
}

QWSTslibMouseHandler::~QWSTslibMouseHandler()
{
    delete d;
}

void QWSTslibMouseHandler::suspend()
{
    d->suspend();
}

void QWSTslibMouseHandler::resume()
{
    d->resume();
}

void QWSTslibMouseHandler::clearCalibration()
{
    d->clearCalibration();
}

void QWSTslibMouseHandler::calibrate(const QWSPointerCalibrationData *data)
{
    d->calibrate(data);
}

QT_END_NAMESPACE

#include "qmousetslib_qws.moc"

#endif //QT_NO_QWS_MOUSE_TSLIB