getContrastFontColor () {
  if(this.colorSelected.length == 7) {
    let r = parseInt(this.colorSelected.substr(1,2),16);
    let g = parseInt(this.colorSelected.substr(3,2),16);
    let b = parseInt(this.colorSelected.substr(5,2),16);
    r *= 0.299;
    g *= 0.587;
    b *= 0.114;
    if((r + g + b) > 186)
      return '#000000';
    else
      return '#ffffff';
  } else {
    return '#000000';
  }
}