# The settings we're showing (or would like to but the widget

    # isn't registered yet):

    # dev+attr : {setting: Uri, onChangeFunc: f, jsValue: str_or_float}

    @settings = new Map()

    @keyForSetting = new Map() # setting uri str -> dev+attr

    # Registered graphValueChanged funcs, by dev+attr. Kept even when

    # settings are deleted.

    @onChanged = new Map()

  addSettingsRow: (device, deviceAttr, setting, value) ->

    key = device.value + " " + deviceAttr.value

    @settings.set(key, {

      setting: setting,

      onChangeFunc: @onChanged[key],

      jsValue: value

    })

    @keyForSetting.set(setting.value, key)

    if @onChanged[key]?

      @onChanged[key](value)

  has: (setting) ->

    @keyForSetting.has(setting.value)