make (offset = 0) {
      this.offset = offset

      Events.emit('move', {
        movement: this.value
      })

      Components.Transition.after(() => {
        Events.emit('move.after', {
          movement: this.value
        })
      })
    }
Calculates a movement value based on passed offset and currently active index.

@param  {Number} offset
@return {Void}