Method open

src/SFML/Window/macOS/JoystickImpl.cpp:179–337

///////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
bool JoystickImpl::open(unsigned int index)
{
    const AutoreleasePool pool;
    m_index                  = index;
    m_hat                    = nullptr;
    const Location deviceLoc = m_locationIDs[index]; // The device we need to load

    // Get all devices
    CFSetRef devices = HIDJoystickManager::getInstance().copyJoysticks();
    if (devices == nullptr)
        return false;

    // Get a usable copy of the joysticks devices.
    const CFIndex          joysticksCount = CFSetGetCount(devices);
    std::vector<CFTypeRef> devicesArray(static_cast<std::size_t>(joysticksCount));
    CFSetGetValues(devices, devicesArray.data());

    // Get the desired joystick.
    IOHIDDeviceRef self = nil;
    for (CFIndex i(0); self == nil && i < joysticksCount; ++i)
    {
        auto* d = static_cast<IOHIDDeviceRef>(const_cast<void*>(devicesArray[static_cast<std::size_t>(i)]));
        if (deviceLoc == HIDInputManager::getLocationID(d))
            self = d;
    }

    if (self == nil)
    {
        CFRelease(devices);
        return false;
    }

    m_identification.name      = getDeviceString(self, CFSTR(kIOHIDProductKey), m_index);
    m_identification.vendorId  = getDeviceUint(self, CFSTR(kIOHIDVendorIDKey), m_index);
    m_identification.productId = getDeviceUint(self, CFSTR(kIOHIDProductIDKey), m_index);

    // Get a list of all elements attached to the device.
    CFArrayRef elements = IOHIDDeviceCopyMatchingElements(self, nullptr, kIOHIDOptionsTypeNone);

    if (elements == nullptr)
    {
        CFRelease(devices);
        return false;
    }

    // Go through all connected elements.
    const CFIndex elementsCount = CFArrayGetCount(elements);
    for (int i = 0; i < elementsCount; ++i)
    {
        auto* element = static_cast<IOHIDElementRef>(const_cast<void*>(CFArrayGetValueAtIndex(elements, i)));
        switch (IOHIDElementGetUsagePage(element))
        {
            case kHIDPage_GenericDesktop:
                switch (IOHIDElementGetUsage(element))
                {
                    case kHIDUsage_GD_X:
                        m_axis[Joystick::Axis::X] = element;
                        break;