keyInput.hpp

#include "GLFW/glfw3.h"
#include <map>
#include <vector>

//shoutout to this guy https://stackoverflow.com/questions/55573238/how-do-i-do-a-proper-input-class-in-glfw-for-a-game-engine

class KeyInput {
    // Main KeyInput functionality
public:
    // Takes a list of which keys to keep state for
    KeyInput(std::vector<int> keysToMonitor);
    ~KeyInput();
    // If this KeyInput is enabled and the given key is monitored,
    // returns pressed state.  Else returns false.
    bool getIsKeyDown(int key);
    // See _isEnabled for details
    bool getIsEnabled() { return _isEnabled; }
    void setIsEnabled(bool value) { _isEnabled = value; }
private:
    // Used internally to update key states.  Called by the GLFW callback.
    void setIsKeyDown(int key, bool isDown);
    // Map from monitored keyes to their pressed states
    std::map<int, bool> _keys;
    // If disabled, KeyInput.getIsKeyDown always returns false
    bool _isEnabled;

    // Workaround for C++ class using a c-style-callback
public:
    // Must be called before any KeyInput instances will work
    static void setupKeyInputs(GLFWwindow* window);
private:
    // The GLFW callback for key events.  Sends events to all KeyInput instances
    static void callback(
        GLFWwindow* window, int key, int scancode, int action, int mods);
    // Keep a list of all KeyInput instances and notify them all of key events
    static std::vector<KeyInput*> _instances;
};