qmouseqnx_qws.cpp

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#include "qmouseqnx_qws.h"
#ifndef QT_NO_QWS_TRANSFORMED
#include "qscreen_qws.h"
#endif

#include "qplatformdefs.h"
#include "qsocketnotifier.h"
#include "private/qcore_unix_p.h"

#include <sys/dcmd_input.h>
#include <errno.h>

QT_BEGIN_NAMESPACE

QQnxMouseHandler::QQnxMouseHandler(const QString & driver, const QString &device)
    : QObject(), QWSMouseHandler(driver, device), mouseButtons(Qt::NoButton)
{
    // open the mouse device with O_NONBLOCK so reading won't block when there's no data
    mouseFD = QT_OPEN(device.isEmpty() ? "/dev/devi/mouse0" : device.toLatin1().constData(),
                      QT_OPEN_RDONLY | O_NONBLOCK);
    if (mouseFD == -1) {
        qErrnoWarning(errno, "QQnxMouseHandler: Unable to open mouse device");
    } else {
        struct _pointer_info data;
        if (devctl(mouseFD, _POINTERGETINFO, &data, sizeof(data), NULL) == EOK)
            absolutePositioning = (data.flags & _POINTER_FLAG_ABSOLUTE);
        else
            absolutePositioning = !device.isEmpty() && device.contains(QLatin1String("touch"));

        // register a socket notifier on the file descriptor so we'll wake up whenever
        // there's a mouse move waiting for us.
        mouseNotifier = new QSocketNotifier(mouseFD, QSocketNotifier::Read, this);
        connect(mouseNotifier, SIGNAL(activated(int)), SLOT(socketActivated()));

        qDebug("QQnxMouseHandler: connected.");
    }
#ifndef QT_NO_QWS_TRANSFORMED
    transformedMousePos = QPoint(qt_screen->deviceWidth() / 2, qt_screen->deviceHeight() / 2);
#endif
}

QQnxMouseHandler::~QQnxMouseHandler()
{
    if (mouseFD != -1)
        QT_CLOSE(mouseFD);
}

void QQnxMouseHandler::resume()
{
    if (mouseNotifier)
        mouseNotifier->setEnabled(true);
}

void QQnxMouseHandler::suspend()
{
    if (mouseNotifier)
        mouseNotifier->setEnabled(false);
}

void QQnxMouseHandler::socketActivated()
{
#ifndef QT_NO_QWS_TRANSFORMED
    QPoint queuedPos = transformedMousePos;
#else
    QPoint queuedPos = mousePos;
#endif

    // _mouse_packet is a QNX structure. devi-hid is nice enough to translate
    // the raw byte data from mouse devices into generic format for us.
    struct _mouse_packet buffer[32];
    int n = 0;

    forever {
        int bytesRead = QT_READ(mouseFD, reinterpret_cast<char *>(buffer) + n, sizeof(buffer) - n);
        if (bytesRead == -1) {
            // EAGAIN means that there are no more mouse events to read
            if (errno != EAGAIN)
                qErrnoWarning(errno, "QQnxMouseHandler: Could not read from input device");
            break;
        }

        n += bytesRead;
        if (n % sizeof(buffer[0]) == 0)
            break;
    }
    n /= sizeof(buffer[0]);

    for (int i = 0; i < n; ++i) {
        const struct _mouse_packet &packet = buffer[i];

        // translate the coordinates from the QNX data structure to the Qt coordinates
        if (absolutePositioning) {
            queuedPos = QPoint(packet.dx, packet.dy);
        } else {
            // note the swapped y axis
            queuedPos += QPoint(packet.dx, -packet.dy);

            // QNX only tells us relative mouse movements, not absolute ones, so
            // limit the cursor position manually to the screen
            limitToScreen(queuedPos);
        }

        // translate the QNX mouse button bitmask to Qt buttons
        int buttons = Qt::NoButton;
        if (packet.hdr.buttons & _POINTER_BUTTON_LEFT)
            buttons |= Qt::LeftButton;
        if (packet.hdr.buttons & _POINTER_BUTTON_MIDDLE)
            buttons |= Qt::MidButton;
        if (packet.hdr.buttons & _POINTER_BUTTON_RIGHT)
            buttons |= Qt::RightButton;

        if (buttons != mouseButtons) {
            // send the MouseEvent to avoid missing any clicks
            mouseChanged(queuedPos, buttons, 0);
            // mousePos updated by the mouseChanged()
#ifndef QT_NO_QWS_TRANSFORMED
            queuedPos = transformedMousePos;
#else
            queuedPos = mousePos;
#endif
            mouseButtons = buttons;
        }
    }

#ifndef QT_NO_QWS_TRANSFORMED
    if (queuedPos != transformedMousePos) {
        mouseChanged(queuedPos, mouseButtons, 0);
        transformedMousePos = queuedPos;
    }
#else
    if (queuedPos != mousePos)
        mouseChanged(queuedPos, mouseButtons, 0);
#endif
}

QT_END_NAMESPACE