Simple Litecanvas plugin to handle buttons/actions. Useful to multiple controls.

plugin-buttons.js

/**
 * @version 1.1.0
 */
function pluginButtons(engine) {
  let _btns
  
  const buttons = (data) => {
    _btns = data || {}
    for (const [key, values] of Object.entries(_btns)) {
      _btns[key] = values.map((v) => v.toLowerCase())
    }
  }
  
  const isbtndown = (id) => {
    if (_btns[id]) {
      for (let key of _btns[id]) {
        if (engine.iskeydown(key)) {
          return true
        }
      }
    }
    return false
  }
  
  const isbtnpressed = (id) => {
    if (_btns[id]) {
      for (let key of _btns[id]) {
        if (engine.iskeypressed(key)) {
          return true
        }
      }
    }
    return false
  }
  
  const lastbtn = () => {
    const key = engine.lastkey()
    for (const [btn, keys] of Object.entries(_btns)) {
      if (keys.includes(key)) {
        return btn
      }
    }
    return null
  }

  return {
    buttons,
    isbtndown,
    isbtnpressed,
    lastbtn
  }
}

Live Demo