mirror of
https://github.com/SFML/SFML.git
synced 2024-11-28 14:21:04 +08:00
339 lines
14 KiB
C++
339 lines
14 KiB
C++
////////////////////////////////////////////////////////////
|
|
// Headers
|
|
////////////////////////////////////////////////////////////
|
|
#include <SFML/Graphics.hpp>
|
|
|
|
#include <vector>
|
|
|
|
|
|
namespace
|
|
{
|
|
std::string vec2ToString(const sf::Vector2i vec2)
|
|
{
|
|
return '(' + std::to_string(vec2.x) + ", " + std::to_string(vec2.y) + ')';
|
|
}
|
|
} // namespace
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \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);
|
|
}
|
|
|
|
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";
|
|
}
|
|
|
|
std::optional<std::string> operator()(const sf::Event::TouchBegan& touchBegan)
|
|
{
|
|
return "Touch Began: " + vec2ToString(touchBegan.position);
|
|
}
|
|
|
|
// When defining a visitor, make sure all event types can be handled by it.
|
|
// If you don't intend on exhaustively specifying an operator() for each
|
|
// event type, you can provide a templated operator() that will be selected
|
|
// by overload resolution when no other event type matches.
|
|
template <typename T>
|
|
std::optional<std::string> operator()(const T&)
|
|
{
|
|
// All unhandled events will end up here
|
|
// application.m_log.emplace_back("Other Event");
|
|
return std::nullopt;
|
|
}
|
|
|
|
Application& application;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////
|
|
void run()
|
|
{
|
|
// This example is for demonstration purposes only
|
|
// All the following forms of event handling have equivalent behavior
|
|
// In your own code you should decide which form of event handling
|
|
// suits your needs best and use a single form of event handling
|
|
while (m_window.isOpen())
|
|
{
|
|
if (m_handlerType == HandlerType::Classic)
|
|
{
|
|
// The "classical form" of event handling
|
|
// Poll/Wait for events in a loop and handle them
|
|
// individually based on their concrete type
|
|
while (const std::optional event = m_window.pollEvent())
|
|
{
|
|
if (event->is<sf::Event::Closed>())
|
|
{
|
|
m_window.close();
|
|
break;
|
|
}
|
|
|
|
if (const auto* keyPress = event->getIf<sf::Event::KeyPressed>())
|
|
{
|
|
m_log.emplace_back("Key Pressed: " + sf::Keyboard::getDescription(keyPress->scancode));
|
|
|
|
// When the enter key is pressed, switch to the next handler type
|
|
if (keyPress->code == sf::Keyboard::Key::Enter)
|
|
{
|
|
m_handlerType = HandlerType::Visitor;
|
|
m_handlerText.setString("Current Handler: Visitor");
|
|
}
|
|
}
|
|
else if (const auto* mouseMoved = event->getIf<sf::Event::MouseMoved>())
|
|
{
|
|
m_log.emplace_back("Mouse Moved: " + vec2ToString(mouseMoved->position));
|
|
}
|
|
else if (event->is<sf::Event::MouseButtonPressed>())
|
|
{
|
|
m_log.emplace_back("Mouse Pressed");
|
|
}
|
|
else if (const auto* touchBegan = event->getIf<sf::Event::TouchBegan>())
|
|
{
|
|
m_log.emplace_back("Touch Began: " + vec2ToString(touchBegan->position));
|
|
}
|
|
else
|
|
{
|
|
// All unhandled events will end up here
|
|
// m_log.emplace_back("Other Event");
|
|
}
|
|
}
|
|
}
|
|
else if (m_handlerType == HandlerType::Visitor)
|
|
{
|
|
// Event Visitor
|
|
// A visitor able to visit all event types is passed to the event
|
|
// The visitor's defined operator()s can also return values
|
|
while (const std::optional event = m_window.pollEvent())
|
|
{
|
|
if (std::optional logMessage = event->visit(Visitor(*this)))
|
|
m_log.emplace_back(std::move(*logMessage));
|
|
}
|
|
}
|
|
else if (m_handlerType == HandlerType::Overload)
|
|
{
|
|
// Overloaded visitation
|
|
// A callable taking a concrete event type is provided per event type you want to handle
|
|
m_window.handleEvents([&](const sf::Event::Closed&) { m_window.close(); },
|
|
[&](const sf::Event::KeyPressed& keyPress)
|
|
{
|
|
m_log.emplace_back(
|
|
"Key Pressed: " + sf::Keyboard::getDescription(keyPress.scancode));
|
|
|
|
// When the enter key is pressed, switch to the next handler type
|
|
if (keyPress.code == sf::Keyboard::Key::Enter)
|
|
{
|
|
m_handlerType = HandlerType::Generic;
|
|
m_handlerText.setString("Current Handler: Generic");
|
|
}
|
|
},
|
|
[&](const sf::Event::MouseMoved& mouseMoved)
|
|
{ m_log.emplace_back("Mouse Moved: " + vec2ToString(mouseMoved.position)); },
|
|
[&](const sf::Event::MouseButtonPressed&) { m_log.emplace_back("Mouse Pressed"); },
|
|
[&](const sf::Event::TouchBegan& touchBegan)
|
|
{ m_log.emplace_back("Touch Began: " + vec2ToString(touchBegan.position)); });
|
|
|
|
// To handle unhandled events, just add the following lambda to the set of handlers
|
|
// [&](const auto&) { m_log.emplace_back("Other Event"); }
|
|
}
|
|
else if (m_handlerType == HandlerType::Generic)
|
|
{
|
|
// Generic visitation
|
|
// A generic callable is provided that can differentiate by deduced event type
|
|
m_window.handleEvents(
|
|
[&](auto&& event)
|
|
{
|
|
// Remove reference and cv-qualifiers
|
|
using T = std::decay_t<decltype(event)>;
|
|
|
|
if constexpr (std::is_same_v<T, sf::Event::Closed>)
|
|
{
|
|
m_window.close();
|
|
}
|
|
else if constexpr (std::is_same_v<T, sf::Event::KeyPressed>)
|
|
{
|
|
m_log.emplace_back("Key Pressed: " + sf::Keyboard::getDescription(event.scancode));
|
|
|
|
// When the enter key is pressed, switch to the next handler type
|
|
if (event.code == sf::Keyboard::Key::Enter)
|
|
{
|
|
m_handlerType = HandlerType::Forward;
|
|
m_handlerText.setString("Current Handler: Forward");
|
|
}
|
|
}
|
|
else if constexpr (std::is_same_v<T, sf::Event::MouseMoved>)
|
|
{
|
|
m_log.emplace_back("Mouse Moved: " + vec2ToString(event.position));
|
|
}
|
|
else if constexpr (std::is_same_v<T, sf::Event::MouseButtonPressed>)
|
|
{
|
|
m_log.emplace_back("Mouse Pressed");
|
|
}
|
|
else if constexpr (std::is_same_v<T, sf::Event::TouchBegan>)
|
|
{
|
|
m_log.emplace_back("Touch Began: " + vec2ToString(event.position));
|
|
}
|
|
else
|
|
{
|
|
// All unhandled events will end up here
|
|
// m_log.emplace_back("Other Event");
|
|
}
|
|
});
|
|
}
|
|
else if (m_handlerType == HandlerType::Forward)
|
|
{
|
|
// Forward to other callable
|
|
// In this case we forward it to our handle member functions
|
|
// we defined for the concrete event types we want to handle
|
|
// When choosing this method a default "catch-all" handler must
|
|
// be available for unhandled events to be forwarded to
|
|
// If you don't want to provide an empty "catch-all" handler
|
|
// you will have to make sure (e.g. via if constexpr) that this
|
|
// lambda doesn't attempt to call a member function that doesn't exist
|
|
m_window.handleEvents([this](const auto& event) { handle(event); });
|
|
}
|
|
|
|
// Limit the log to 24 entries
|
|
if (m_log.size() > 24u)
|
|
m_log.erase(m_log.begin(), m_log.begin() + static_cast<int>(m_log.size() - 24u));
|
|
|
|
// Draw the contents of the log to the window
|
|
m_window.clear();
|
|
|
|
for (std::size_t i = 0; i < m_log.size(); ++i)
|
|
{
|
|
m_logText.setPosition({50.f, static_cast<float>(i * 20) + 50.f});
|
|
m_logText.setString(m_log[i]);
|
|
m_window.draw(m_logText);
|
|
}
|
|
|
|
m_window.draw(m_handlerText);
|
|
m_window.draw(m_instructions);
|
|
m_window.display();
|
|
}
|
|
}
|
|
|
|
// The following handle methods are called by the forwarding event handler implementation
|
|
// A handle method is defined per event type you want to handle
|
|
// To handle any other events that are left, the templated handle method will be called
|
|
// Overload resolution will prefer the handle methods that fit the event type better
|
|
// before falling back to the templated method
|
|
void handle(const sf::Event::Closed&)
|
|
{
|
|
m_window.close();
|
|
}
|
|
|
|
void handle(const sf::Event::KeyPressed& keyPress)
|
|
{
|
|
m_log.emplace_back("Key Pressed: " + sf::Keyboard::getDescription(keyPress.scancode));
|
|
|
|
// When the enter key is pressed, switch to the next handler type
|
|
if (keyPress.code == sf::Keyboard::Key::Enter)
|
|
{
|
|
m_handlerType = HandlerType::Classic;
|
|
m_handlerText.setString("Current Handler: Classic");
|
|
}
|
|
}
|
|
|
|
void handle(const sf::Event::MouseMoved& mouseMoved)
|
|
{
|
|
m_log.emplace_back("Mouse Moved: " + vec2ToString(mouseMoved.position));
|
|
}
|
|
|
|
void handle(const sf::Event::MouseButtonPressed&)
|
|
{
|
|
m_log.emplace_back("Mouse Pressed");
|
|
}
|
|
|
|
void handle(const sf::Event::TouchBegan& touchBegan)
|
|
{
|
|
m_log.emplace_back("Touch Began: " + vec2ToString(touchBegan.position));
|
|
}
|
|
|
|
template <typename T>
|
|
void handle(const T&)
|
|
{
|
|
// All unhandled events will end up here
|
|
// m_log.emplace_back("Other Event");
|
|
}
|
|
|
|
private:
|
|
enum class HandlerType
|
|
{
|
|
Classic,
|
|
Visitor,
|
|
Overload,
|
|
Generic,
|
|
Forward
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Member data
|
|
////////////////////////////////////////////////////////////
|
|
sf::RenderWindow m_window{sf::VideoMode({800u, 600u}), "SFML Event Handling", sf::Style::Titlebar | sf::Style::Close};
|
|
const sf::Font m_font{"resources/tuffy.ttf"};
|
|
sf::Text m_logText{m_font, "", 20};
|
|
sf::Text m_handlerText{m_font, "Current Handler: Classic", 24};
|
|
sf::Text m_instructions{m_font, "Press Enter to change handler type", 24};
|
|
std::vector<std::string> m_log;
|
|
HandlerType m_handlerType{HandlerType::Classic};
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// Entry point of application
|
|
///
|
|
/// \return Application exit code
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
int main()
|
|
{
|
|
Application application;
|
|
application.run();
|
|
}
|