| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** |
| ** This file is part of the QtGui module of the Qt Toolkit. |
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| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ****************************************************************************/ |
| |
| #include "qevdevmousehandler_p.h" |
| |
| #include <QSocketNotifier> |
| #include <QStringList> |
| #include <QPoint> |
| #include <QGuiApplication> |
| #include <QScreen> |
| #include <QLoggingCategory> |
| #include <qpa/qwindowsysteminterface.h> |
| |
| #include <qplatformdefs.h> |
| #include <private/qcore_unix_p.h> // overrides QT_OPEN |
| #include <private/qhighdpiscaling_p.h> |
| |
| #include <errno.h> |
| |
| #ifdef Q_OS_FREEBSD |
| #include <dev/evdev/input.h> |
| #else |
| #include <linux/kd.h> |
| #include <linux/input.h> |
| #endif |
| |
| #define TEST_BIT(array, bit) (array[bit/8] & (1<<(bit%8))) |
| |
| QT_BEGIN_NAMESPACE |
| |
| Q_LOGGING_CATEGORY(qLcEvdevMouse, "qt.qpa.input") |
| |
| std::unique_ptr<QEvdevMouseHandler> QEvdevMouseHandler::create(const QString &device, const QString &specification) |
| { |
| qCDebug(qLcEvdevMouse) << "create mouse handler for" << device << specification; |
| |
| bool compression = true; |
| int jitterLimit = 0; |
| int grab = 0; |
| bool abs = false; |
| |
| const auto args = specification.splitRef(QLatin1Char(':')); |
| for (const QStringRef &arg : args) { |
| if (arg == QLatin1String("nocompress")) |
| compression = false; |
| else if (arg.startsWith(QLatin1String("dejitter="))) |
| jitterLimit = arg.mid(9).toInt(); |
| else if (arg.startsWith(QLatin1String("grab="))) |
| grab = arg.mid(5).toInt(); |
| else if (arg == QLatin1String("abs")) |
| abs = true; |
| } |
| |
| int fd; |
| fd = qt_safe_open(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0); |
| if (fd >= 0) { |
| ::ioctl(fd, EVIOCGRAB, grab); |
| return std::unique_ptr<QEvdevMouseHandler>(new QEvdevMouseHandler(device, fd, abs, compression, jitterLimit)); |
| } else { |
| qErrnoWarning(errno, "Cannot open mouse input device %s", qPrintable(device)); |
| return nullptr; |
| } |
| } |
| |
| QEvdevMouseHandler::QEvdevMouseHandler(const QString &device, int fd, bool abs, bool compression, int jitterLimit) |
| : m_device(device), m_fd(fd), m_notify(0), m_x(0), m_y(0), m_prevx(0), m_prevy(0), |
| m_abs(abs), m_compression(compression), m_buttons(0), m_prevInvalid(true) |
| { |
| setObjectName(QLatin1String("Evdev Mouse Handler")); |
| |
| m_jitterLimitSquared = jitterLimit * jitterLimit; |
| |
| // Some touch screens present as mice with absolute coordinates. |
| // These can not be differentiated from touchpads, so supplying abs to QT_QPA_EVDEV_MOUSE_PARAMETERS |
| // will force qevdevmousehandler to treat the coordinates as absolute, scaled to the hardware maximums. |
| // Turning this on will not affect mice as these do not report in absolute coordinates |
| // but will make touchpads act like touch screens |
| if (m_abs) |
| m_abs = getHardwareMaximum(); |
| |
| // socket notifier for events on the mouse device |
| m_notify = new QSocketNotifier(m_fd, QSocketNotifier::Read, this); |
| connect(m_notify, &QSocketNotifier::activated, |
| this, &QEvdevMouseHandler::readMouseData); |
| } |
| |
| QEvdevMouseHandler::~QEvdevMouseHandler() |
| { |
| if (m_fd >= 0) |
| qt_safe_close(m_fd); |
| } |
| |
| // Ask touch screen hardware for information on coordinate maximums |
| // If any ioctls fail, revert to non abs mode |
| bool QEvdevMouseHandler::getHardwareMaximum() |
| { |
| unsigned char absFeatures[(ABS_MAX / 8) + 1]; |
| memset(absFeatures, '\0', sizeof (absFeatures)); |
| |
| // test if ABS_X, ABS_Y are available |
| if (ioctl(m_fd, EVIOCGBIT(EV_ABS, sizeof (absFeatures)), absFeatures) == -1) |
| return false; |
| |
| if ((!TEST_BIT(absFeatures, ABS_X)) || (!TEST_BIT(absFeatures, ABS_Y))) |
| return false; |
| |
| // ask hardware for minimum and maximum values |
| struct input_absinfo absInfo; |
| if (ioctl(m_fd, EVIOCGABS(ABS_X), &absInfo) == -1) |
| return false; |
| |
| m_hardwareWidth = absInfo.maximum - absInfo.minimum; |
| |
| if (ioctl(m_fd, EVIOCGABS(ABS_Y), &absInfo) == -1) |
| return false; |
| |
| m_hardwareHeight = absInfo.maximum - absInfo.minimum; |
| |
| QScreen *primaryScreen = QGuiApplication::primaryScreen(); |
| QRect g = QHighDpi::toNativePixels(primaryScreen->virtualGeometry(), primaryScreen); |
| m_hardwareScalerX = static_cast<qreal>(m_hardwareWidth) / (g.right() - g.left()); |
| m_hardwareScalerY = static_cast<qreal>(m_hardwareHeight) / (g.bottom() - g.top()); |
| |
| qCDebug(qLcEvdevMouse) << "Absolute pointing device" |
| << "hardware max x" << m_hardwareWidth |
| << "hardware max y" << m_hardwareHeight |
| << "hardware scalers x" << m_hardwareScalerX << 'y' << m_hardwareScalerY; |
| |
| return true; |
| } |
| |
| void QEvdevMouseHandler::sendMouseEvent() |
| { |
| int x; |
| int y; |
| |
| if (!m_abs) { |
| x = m_x - m_prevx; |
| y = m_y - m_prevy; |
| } |
| else { |
| x = m_x / m_hardwareScalerX; |
| y = m_y / m_hardwareScalerY; |
| } |
| |
| if (m_prevInvalid) { |
| x = y = 0; |
| m_prevInvalid = false; |
| } |
| |
| emit handleMouseEvent(x, y, m_abs, m_buttons, m_button, m_eventType); |
| |
| m_prevx = m_x; |
| m_prevy = m_y; |
| } |
| |
| void QEvdevMouseHandler::readMouseData() |
| { |
| struct ::input_event buffer[32]; |
| int n = 0; |
| bool posChanged = false, btnChanged = false; |
| bool pendingMouseEvent = false; |
| int eventCompressCount = 0; |
| forever { |
| int result = QT_READ(m_fd, reinterpret_cast<char *>(buffer) + n, sizeof(buffer) - n); |
| |
| if (result == 0) { |
| qWarning("evdevmouse: Got EOF from the input device"); |
| return; |
| } else if (result < 0) { |
| if (errno != EINTR && errno != EAGAIN) { |
| qErrnoWarning(errno, "evdevmouse: Could not read from input device"); |
| // If the device got disconnected, stop reading, otherwise we get flooded |
| // by the above error over and over again. |
| if (errno == ENODEV) { |
| delete m_notify; |
| m_notify = nullptr; |
| qt_safe_close(m_fd); |
| m_fd = -1; |
| } |
| return; |
| } |
| } else { |
| n += result; |
| if (n % sizeof(buffer[0]) == 0) |
| break; |
| } |
| } |
| |
| n /= sizeof(buffer[0]); |
| |
| for (int i = 0; i < n; ++i) { |
| struct ::input_event *data = &buffer[i]; |
| if (data->type == EV_ABS) { |
| // Touchpads: store the absolute position for now, will calculate a relative one later. |
| if (data->code == ABS_X && m_x != data->value) { |
| m_x = data->value; |
| posChanged = true; |
| } else if (data->code == ABS_Y && m_y != data->value) { |
| m_y = data->value; |
| posChanged = true; |
| } |
| } else if (data->type == EV_REL) { |
| QPoint delta; |
| if (data->code == REL_X) { |
| m_x += data->value; |
| posChanged = true; |
| } else if (data->code == REL_Y) { |
| m_y += data->value; |
| posChanged = true; |
| } else if (data->code == ABS_WHEEL) { // vertical scroll |
| // data->value: positive == up, negative == down |
| delta.setY(120 * data->value); |
| emit handleWheelEvent(delta); |
| } else if (data->code == ABS_THROTTLE) { // horizontal scroll |
| // data->value: positive == right, negative == left |
| delta.setX(-120 * data->value); |
| emit handleWheelEvent(delta); |
| } |
| } else if (data->type == EV_KEY && data->code == BTN_TOUCH) { |
| // We care about touchpads only, not touchscreens -> don't map to button press. |
| // Need to invalidate prevx/y however to get proper relative pos. |
| m_prevInvalid = true; |
| } else if (data->type == EV_KEY && data->code >= BTN_LEFT && data->code <= BTN_JOYSTICK) { |
| Qt::MouseButton button = Qt::NoButton; |
| // BTN_LEFT == 0x110 in kernel's input.h |
| // The range of possible mouse buttons ends just before BTN_JOYSTICK, value 0x120. |
| switch (data->code) { |
| case 0x110: button = Qt::LeftButton; break; // BTN_LEFT |
| case 0x111: button = Qt::RightButton; break; |
| case 0x112: button = Qt::MiddleButton; break; |
| case 0x113: button = Qt::ExtraButton1; break; // AKA Qt::BackButton |
| case 0x114: button = Qt::ExtraButton2; break; // AKA Qt::ForwardButton |
| case 0x115: button = Qt::ExtraButton3; break; // AKA Qt::TaskButton |
| case 0x116: button = Qt::ExtraButton4; break; |
| case 0x117: button = Qt::ExtraButton5; break; |
| case 0x118: button = Qt::ExtraButton6; break; |
| case 0x119: button = Qt::ExtraButton7; break; |
| case 0x11a: button = Qt::ExtraButton8; break; |
| case 0x11b: button = Qt::ExtraButton9; break; |
| case 0x11c: button = Qt::ExtraButton10; break; |
| case 0x11d: button = Qt::ExtraButton11; break; |
| case 0x11e: button = Qt::ExtraButton12; break; |
| case 0x11f: button = Qt::ExtraButton13; break; |
| } |
| m_buttons.setFlag(button, data->value); |
| m_button = button; |
| m_eventType = data->value == 0 ? QEvent::MouseButtonRelease : QEvent::MouseButtonPress; |
| btnChanged = true; |
| } else if (data->type == EV_SYN && data->code == SYN_REPORT) { |
| if (btnChanged) { |
| btnChanged = posChanged = false; |
| sendMouseEvent(); |
| pendingMouseEvent = false; |
| } else if (posChanged) { |
| m_eventType = QEvent::MouseMove; |
| posChanged = false; |
| if (m_compression) { |
| pendingMouseEvent = true; |
| eventCompressCount++; |
| } else { |
| sendMouseEvent(); |
| } |
| } |
| } else if (data->type == EV_MSC && data->code == MSC_SCAN) { |
| // kernel encountered an unmapped key - just ignore it |
| continue; |
| } |
| } |
| if (m_compression && pendingMouseEvent) { |
| int distanceSquared = (m_x - m_prevx)*(m_x - m_prevx) + (m_y - m_prevy)*(m_y - m_prevy); |
| if (distanceSquared > m_jitterLimitSquared) |
| sendMouseEvent(); |
| } |
| } |
| |
| QT_END_NAMESPACE |