pop_event()

std::optional< Core::WindowEvent > MayaFlux::Vruta::EventSource::pop_event ( const EventFilter &  filter )

private

Pop event matching filter from queue.

Parameters

filter

Filter criteria

Returns

Event if found, nullopt otherwise

Searches the queue for an event matching all filter criteria. Removes and returns the first matching event, preserving order of non-matching events.

Definition at line 59 of file EventSource.cpp.

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

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

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

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