function Keyboard () {
  this.is_down = {}

  this.key_up = function (e) {
  }

  this.key_down = function (e) {
    ronin.keyboard.is_down[e.key] = true

    if (ronin.commander.is_focused() && e.key == 'Enter') {
      e.preventDefault()
      ronin.commander.validate()
    }

    if (ronin.commander.is_focused()) {

    }
  }
}