zippy-game-engine/dist/systems/input/keyboard-system.js

A lightweight game engine for web games

export class KeyboardSystem {
    keys;
    boundKeyDown;
    boundKeyUp;
    constructor() {
        this.keys = {};
        this.boundKeyDown = this.#handleKeyDown.bind(this);
        this.boundKeyUp = this.#handleKeyUp.bind(this);
        this.#setupEventListeners();
    }
    isKeyDown(key) {
        return this.keys[key] || false;
    }
    destroy() {
        window.removeEventListener("keydown", this.boundKeyDown);
        window.removeEventListener("keyup", this.boundKeyUp);
    }
    #setupEventListeners() {
        window.addEventListener("keydown", this.boundKeyDown);
        window.addEventListener("keyup", this.boundKeyUp);
    }
    #handleKeyDown(e) {
        this.keys[e.key] = true;
        if (["ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight", " "].includes(e.key)) {
            e.preventDefault(); // Prevent scrolling for arrow keys/space
        }
    }
    #handleKeyUp(e) {
        this.keys[e.key] = false;
    }
}
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