godot-cpp-utils/player_input.cpp

#include "player_input.hpp"
#include "godot_macros.h"
#include "godot_cpp/classes/input.hpp"
#include "godot_cpp/classes/input_event.hpp"
#include "godot_cpp/classes/input_event_mouse_motion.hpp"
#include <algorithm>

namespace godot {
void PlayerInput::_bind_methods() {}

PlayerInput::Listener::Listener(String positive, String negative, Node *object, String method)
: actionNegative{negative}
, actionPositive{positive}
, methodName{method}
, object{object}
, isMouseEvent{positive.begins_with("_mouse_") || negative.begins_with("_mouse_")} {}

float PlayerInput::Listener::evaluate_event(Ref<InputEvent> const &event, String const &action) {
    Input *input = Input::get_singleton();
    if(!action.begins_with("_mouse_")) {
        return float(input->is_action_pressed(action));
    } else {
        InputEventMouseMotion *motion = Object::cast_to<InputEventMouseMotion>(*event);
        if(motion == nullptr)
            return 0.f;
        if(action.ends_with("_up") || action.ends_with("_right")) {
            return motion->get_relative().x;
        } if(action.ends_with("_right") || action.ends_with("_left")) {
            return motion->get_relative().y;
        }
    }
    return 0.f;
}

bool PlayerInput::Listener::has_changed(Ref<InputEvent> const &event) {
    return (
        (!event->is_class("InputEventMouseMotion") ||
            this->isMouseEvent
        ) ||
        event->is_action(this->actionNegative) ||
        event->is_action(this->actionPositive)
    );
}

float PlayerInput::Listener::evaluate(Ref<InputEvent> const &event) {
    float positive = PlayerInput::Listener::evaluate_event(event, this->actionPositive);
    float negative = PlayerInput::Listener::evaluate_event(event, this->actionNegative);
    float newest = positive - negative;
    if(lastCached != newest)
        this->object->call(this->methodName, event, newest);
    return (lastCached = newest);
}

bool PlayerInput::Listener::operator==(godot::PlayerInput::Listener const& b) {
    return this->methodName == b.methodName
        && this->object == b.object
        && this->actionNegative == b.actionNegative
        && this->actionPositive == b.actionPositive;
}

void PlayerInput::_unhandled_input(Ref<InputEvent> const &event) {
    GDGAMEONLY();
    for(Listener& listener: this->listeners) {
        if(listener.has_changed(event)) {
            listener.evaluate(event);
        }
    }
}

void PlayerInput::listen_to(Listener const& listener) {
    this->listeners.push_back(listener);
}

void PlayerInput::stop_listening(Node *node) {
    for(size_t i = 0; i < this->listeners.size(); ++i) {
        Listener& l = this->listeners.at(i);
        if(l.object == node) {
            this->listeners.erase(this->listeners.begin() + i);
            i--;
        }
    }
}

void PlayerInput::stop_listening(Listener const& listener) {
    std::vector<Listener>::iterator itr = std::find(this->listeners.begin(), this->listeners.end(), listener);
    if(itr != this->listeners.end())
        this->listeners.erase(itr);
}
}