pop_event()

std::optional< Core::WindowEvent > MayaFlux::Vruta::WindowEventSource::pop_event ( const WindowEventFilter &  filter )

private

Removes and returns the first pending event matching the filter.

Parameters

filter

Filter criteria.

Definition at line 44 of file WindowEventSource.cpp.

{
    if (m_pending_events.empty())
        return std::nullopt;
 
    if (!filter.event_type && !filter.key_code && !filter.button) {
        auto ev = m_pending_events.front();
        m_pending_events.pop();
        return ev;
    }
 
    std::queue<Core::WindowEvent> tmp;
    std::optional<Core::WindowEvent> result;
 
    while (!m_pending_events.empty()) {
        auto ev = m_pending_events.front();
        m_pending_events.pop();
 
        bool matches = true;
 
        if (filter.event_type && ev.type != *filter.event_type)
            matches = false;
 
        if (matches && filter.key_code) {
            if (auto* kd = std::get_if<Core::WindowEvent::KeyData>(&ev.data)) {
                matches = kd->key == static_cast<int16_t>(*filter.key_code);
            } else {
                matches = false;
            }
        }
 
        if (matches && filter.button) {
            if (auto* bd = std::get_if<Core::WindowEvent::MouseButtonData>(&ev.data)) {
                matches = bd->button == static_cast<int>(*filter.button);
            } else {
                matches = false;
            }
        }
 
        if (matches && !result) {
            result = ev;
        } else {
            tmp.push(ev);
        }
    }
 
    m_pending_events = std::move(tmp);
    return result;
}

References MayaFlux::Vruta::WindowEventFilter::button, MayaFlux::Vruta::WindowEventFilter::event_type, MayaFlux::Vruta::WindowEventFilter::key_code, and m_pending_events.

Referenced by MayaFlux::Kriya::WindowEventAwaiter::await_ready(), and MayaFlux::Kriya::WindowEventAwaiter::try_resume().

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