Keylock.js

Keylock.js

/* eslint-disable no-undef */

// http://keycode.info
class Keylock {
  constructor(key) {
    this.keyCode = key.charCodeAt(0);
    this.isDown = false;
    this.isUp = true;
    this.onPress = undefined;
    this.onRelease = undefined;
    window.addEventListener(
      'keydown', this.downHandler.bind(this), false,
    );
    window.addEventListener(
      'keyup', this.upHandler.bind(this), false,
    );
  }

  downHandler(event) {
    if (event.keyCode === this.keyCode) {
      if (this.isUp === true && typeof this.onPress === 'function') {
        this.onPress();
      }
      this.isDown = true;
      this.isUp = false;
    }
    event.preventDefault();
  }

  upHandler(event) {
    if (event.keyCode === this.keyCode) {
      if (this.isDown === true && typeof this.onRelease === 'function') {
        this.onRelease();
      }
      this.isDown = false;
      this.isUp = true;
    }
    event.preventDefault();
  }

  setOnPress(parameter) {
    if (typeof parameter === 'function') {
      this.onPress = parameter;
    }
    return this;
  }

  setOnRelease(parameter) {
    if (typeof parameter === 'function') {
      this.onRelease = parameter;
    }
    return this;
  }
}

export default Keylock;