Class Application

examples/event_handling/EventHandling.cpp:30–401

/////////////////////////////////////////////////////// \brief Application class ///////////////////////////////////////////////////////

///
////////////////////////////////////////////////////////////
class Application
{
public:
    ////////////////////////////////////////////////////////////
    Application()
    {
        m_window.setVerticalSyncEnabled(true);
        m_logText.setFillColor(sf::Color::White);
        m_handlerText.setFillColor(sf::Color::White);
        m_handlerText.setStyle(sf::Text::Bold);
        m_handlerText.setPosition({380.f, 260.f});
        m_instructions.setFillColor(sf::Color::White);
        m_instructions.setStyle(sf::Text::Bold);
        m_instructions.setPosition({380.f, 310.f});
    }

    // The visitor we pass to event->visit in the "Visitor" handler
    // Make sure all defined operator()s return the same type.
    // The operator()s can also have void return type if there is nothing to return.
    struct Visitor
    {
        explicit Visitor(Application& app) : application(app)
        {
        }

        std::optional<std::string> operator()(const sf::Event::Closed&)
        {
            application.m_window.close();
            return std::nullopt;
        }

        std::optional<std::string> operator()(const sf::Event::KeyPressed& keyPress)
        {
            // When the enter key is pressed, switch to the next handler type
            if (keyPress.code == sf::Keyboard::Key::Enter)
            {
                application.m_handlerType = HandlerType::Overload;
                application.m_handlerText.setString("Current Handler: Overload");
            }

            return "Key Pressed: " + sf::Keyboard::getDescription(keyPress.scancode).toAnsiString();
        }

        std::optional<std::string> operator()(const sf::Event::KeyReleased& keyRelease)
        {
            return "Key Released: " + sf::Keyboard::getDescription(keyRelease.scancode).toAnsiString();
        }

        std::optional<std::string> operator()(const sf::Event::MouseMoved& mouseMoved)
        {
            return "Mouse Moved: " + vec2ToString(mouseMoved.position);
        }

        std::optional<std::string> operator()(const sf::Event::MouseButtonPressed&)
        {
            return "Mouse Pressed";
        }