以编程方式使dart中的十六进制 colored颜色变亮或变暗

发布于10月29日

我试图通过编程方式将这个哈希 colored颜色代码#159424 (GREEN-COLOR)转换为更暗和更亮的 colored颜色 .怎么做请帮忙？

make green color darker

toDarkColor(String hashColor){
  // how to convert that hash string to make green color darker?
}

make green color lighter个

toLightColor(String hashColor){
  // how to convert that hash string to make green color lighter? 
}

推荐答案

适合那些想要变暗或变亮Color而不是六边形线的人

// ranges from 0.0 to 1.0

Color darken(Color color, [double amount = .1]) {
  assert(amount >= 0 && amount <= 1);

  final hsl = HSLColor.fromColor(color);
  final hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));

  return hslDark.toColor();
}

Color lighten(Color color, [double amount = .1]) {
  assert(amount >= 0 && amount <= 1);

  final hsl = HSLColor.fromColor(color);
  final hslLight = hsl.withLightness((hsl.lightness + amount).clamp(0.0, 1.0));

  return hslLight.toColor();
}

// usage
final lightRed = lighten(Colors.red);
final darkBlue = darken(Colors.blue, .3);