spacebox/src/Input.cpp

       /*         +------------------------------------------------------+
  ____/  \____   /| - Open source game framework licensed to freely use, |
  \          /  / |   copy, modify and sell without restriction          |
+--\ ^__^   /--+  |                                                      |
| ~/        \~ |  | - created for <https://foam.shampoo.ooo>             |
| ~~~~~~~~~~~~ |  +------------------------------------------------------+
| SPACE ~~~~~  | /
|  ~~~~~~~ BOX |/
+-------------*/

#include "Input.hpp"

Input::Input(Node *parent) : Node(parent)
{
    get_delegate().subscribe(&Input::respond, this, SDL_KEYDOWN);
    get_delegate().subscribe(&Input::respond, this, SDL_KEYUP);
    for (KeyCombination& combination : key_map)
    {
        print_key_combination(combination);
    }
}

void Input::print_key_combination(const KeyCombination &combination) const
{
    std::cout << "<KeyCombination " << combination.command << ", " <<
        combination.key << ", ctrl " << combination.ctrl << ", shift " <<
        combination.shift << ", alt " << combination.alt << ">" << std::endl;
}

void Input::load_key_map()
{
    const nlohmann::json& config = configuration()();
    for (const auto& [command, input] : config.at("keys").items())
    {
        if (input.is_array() && input.size())
        {
            if (input[0].is_array())
            {
                for (nlohmann::json version : input)
                {
                    key_map.push_back(parse_key(command, version));
                }
            }
            else
            {
                key_map.push_back(parse_key(command, input));
            }
        }
        else if (!input.is_array())
        {
            key_map.push_back((KeyCombination){command, get_key_code(input.get<std::string>()), false, false, false});
        }
    }
}

KeyCombination Input::parse_key(const std::string& command, const nlohmann::json& json) const
{
    SDL_Keycode key_code;
    bool ctrl = false, alt = false, shift = false;
    for (const std::string& component : json)
    {
        if (component == "CTRL")
        {
            ctrl = true;
        }
        else if (component == "SHIFT")
        {
            shift = true;
        }
        else if (component == "ALT")
        {
            alt = true;
        }
        else
        {
            key_code = get_key_code(component);
        }
    }
    return (KeyCombination){command, key_code, ctrl, shift, alt};
}

int Input::get_key_code(const std::string& name) const
{
    if (key_ids.count(name) > 0)
    {
        return key_ids.at(name);
    }
    else
    {
        return (SDL_Keycode) name[0];
    }
}

void Input::add_to_key_map(std::string command, SDL_Keycode key_code, bool ctrl, bool shift, bool alt)
{
    key_map.push_back((KeyCombination){command, key_code, ctrl, shift, alt});
}

void Input::respond(SDL_Event &event)
{
    if (!is_suppressed())
    {
        SDL_Keymod mod = SDL_GetModState();
        SDL_Keycode sym = event.key.keysym.sym;
        bool found_command = false, cancel = event.type != SDL_KEYDOWN, ctrl = mod & KMOD_CTRL,
            shift = mod & KMOD_SHIFT, alt = mod & KMOD_ALT,
            suppress_any_key = configuration()["input"]["suppress any key on mods"] && (ctrl || alt);
        const std::vector<std::string>& system_any_key_ignore = configuration()["input"]["system any key ignore commands"];
        const std::vector<std::string>& any_key_ignore = configuration()["input"]["any key ignore commands"];
        bool ignore_repeat = configuration()["input"]["ignore repeat keypress"];
        if (event.key.repeat == 0 || !ignore_repeat)
        {
            for (KeyCombination& combination : key_map)
            {
                if (sym == combination.key && (!combination.ctrl || ctrl) && (!combination.shift || shift) && (!combination.alt || alt))
                {
                    sb::Delegate::post(combination.command, cancel);
                    if (!sb::is_in_container(system_any_key_ignore, combination.command) && !found_command &&
                        !sb::is_in_container(any_key_ignore, combination.command) && !suppress_any_key)
                    {
                        sb::Delegate::post(any, cancel);
                    }
                    found_command = true;
                }
            }
            if (!found_command && !suppress_any_key)
            {
                sb::Delegate::post(any, cancel);
            }
        }
    }
}

void Input::suppress()
{
    suppressed = true;
}

void Input::unsuppress()
{
    suppressed = false;
}

bool Input::is_suppressed()
{
    return suppressed;
}