Add Windows input.

Co-authored-by: Mikael Olenfalk <mikael@olenfalk.se>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

include/ftxui/component/event_input_listener.hpp

@@ -0,0 +1,55 @@
+#ifndef FTXUI_COMPONENT_EVENT_INPUT_LISTENER_HPP
+#define FTXUI_COMPONENT_EVENT_INPUT_LISTENER_HPP
+
+#include <atomic>
+#include <functional>
+#include <thread>
+
+#include "event.hpp"
+
+#ifdef WIN32
+  #include <condition_variable>
+  #include <deque>
+  #include <mutex>
+#endif
+
+namespace ftxui {
+
+// Receives input events from the OS and turns them into
+// Event objects and sends to a consumer
+//
+// On NIX systems:
+//   - uses SIGWINCH for resize
+//   - uses getchar() for keypresses
+//
+// On Windows systems:
+//   - Uses ReadConsoleInput for resize and keypresses
+class EventInputListener {
+ public:
+  EventInputListener(std::function<void(Event)> consumer);
+  ~EventInputListener();
+
+  void stop();
+
+ private:
+  char readchar();
+  void readchar_thread_func(std::function<void(Event)> consumer);
+
+  std::atomic<bool> quit_{false};
+  std::thread readchar_thread_;
+#ifndef _WIN32
+  using signal_handler_t = void (*)(int);
+  signal_handler_t old_sigwinch_handler_;
+#else
+  void input_thread_func(std::function<void(Event)> consumer);
+
+  std::mutex input_queue_mutex_;
+  std::condition_variable input_queue_condvar_;
+  std::deque<char> input_queue_;
+  std::thread input_event_thread_;
+#endif
+};
+
+}  // namespace ftxui
+
+#endif /* end of include guard: FTXUI_COMPONENT_EVENT_INPUT_LISTENER_HPP */