tablet-simulator/devicemanager.cpp

#include "devicemanager.h"

DeviceManager::~DeviceManager() { destroyDevice(); }

QString DeviceManager::name() const
{
    return m_name;
}

void DeviceManager::setName(const QString &name)
{
    if (m_name != name)
    {
        m_name = name;
        Q_EMIT nameChanged();
    }
}

bool DeviceManager::direct() const
{
    return m_direct;
}

void DeviceManager::setDirect(bool direct)
{
    if (m_direct != direct)
    {
        m_direct = direct;
        Q_EMIT directChanged();
    }
}

bool DeviceManager::pad() const
{
    return m_pad;
}

void DeviceManager::setPad(bool pad)
{
    if (m_pad != pad)
    {
        m_pad = pad;
        Q_EMIT padChanged();
    }
}

int DeviceManager::penButtons() const
{
    return m_penButtons;
}

void DeviceManager::setPenButtons(int num)
{
    if (m_penButtons != num)
    {
        m_penButtons = num;
        Q_EMIT penButtonsChanged();
    }
}

void DeviceManager::recreateDevice()
{
    destroyDevice();

    input_absinfo xInfo{
        .value = 28166,
        .minimum = 0,
        .maximum = 47664,
        .resolution = 100,
    };

    input_absinfo yInfo{
        .value = 22040,
        .minimum = 0,
        .maximum = 26778,
        .resolution = 100,
    };

    input_absinfo pressureInfo{
        .minimum = 0,
        .maximum = 8191,
    };

    input_absinfo tiltInfo{
        .minimum = -127,
        .maximum = 127,
    };

    dev = libevdev_new();
    libevdev_set_name(dev, m_name.toUtf8().constData());
    libevdev_enable_event_type(dev, EV_SYN);
    libevdev_enable_event_type(dev, EV_KEY);
    if (!m_pad)
    {
        if (m_penButtons >= 1) {
            libevdev_enable_event_code(dev, EV_KEY, BTN_TOOL_PEN, NULL);
        }
        if (m_penButtons >= 2) {
            libevdev_enable_event_code(dev, EV_KEY, BTN_TOOL_RUBBER, NULL);
        }
        if (m_penButtons >= 3) {
            libevdev_enable_event_code(dev, EV_KEY, BTN_TOUCH, NULL);
        }
        libevdev_enable_event_code(dev, EV_KEY, BTN_STYLUS, NULL);

        libevdev_enable_event_type(dev, EV_ABS);
        libevdev_enable_event_code(dev, EV_ABS, ABS_X, &xInfo);
        libevdev_enable_event_code(dev, EV_ABS, ABS_Y, &yInfo);
        libevdev_enable_event_code(dev, EV_ABS, ABS_PRESSURE, &pressureInfo);
        libevdev_enable_event_code(dev, EV_ABS, ABS_TILT_Y, &tiltInfo);
        libevdev_enable_event_code(dev, EV_ABS, ABS_TILT_X, &tiltInfo);

        if (m_direct)
        {
            libevdev_enable_property(dev, INPUT_PROP_DIRECT);
        }
    } else
    {
        libevdev_enable_event_code(dev, EV_KEY, BTN_0, NULL);
        libevdev_enable_event_code(dev, EV_KEY, BTN_1, NULL);
        libevdev_enable_event_code(dev, EV_KEY, BTN_2, NULL);
        libevdev_enable_event_code(dev, EV_KEY, BTN_3, NULL);

        libevdev_enable_event_type(dev, EV_REL);
        libevdev_enable_event_code(dev, EV_REL, REL_HWHEEL, NULL);
        libevdev_enable_event_code(dev, EV_REL, REL_WHEEL, NULL);

        libevdev_enable_event_type(dev, EV_MSC);
        libevdev_enable_event_code(dev, EV_MSC, MSC_SCAN, NULL);
    }

    rc = libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev);

    uinput_fd = libevdev_uinput_get_fd(uidev);

    devnode = libevdev_uinput_get_devnode(uidev);

    fd = open(devnode, O_RDONLY);
}

void DeviceManager::testButton()
{
    libevdev_uinput_write_event(uidev, EV_KEY, BTN_TOOL_PEN, 1);
    libevdev_uinput_write_event(uidev, EV_KEY, BTN_TOOL_PEN, 0);
}

void DeviceManager::destroyDevice()
{
    libevdev_free(dev);
    libevdev_uinput_destroy(uidev);
    close(fd);

    /* uinput fd is managed, so make sure it did get closed */
    close(uinput_fd);
}