toParameterString method
toParameterString make String to apply this as filter
Implementation
List<String> toParameterString() {
_makeDataValid();
return [
"${blur}px",
"${invert * 100}%",
"${grayscale * 100}%",
"${bright * 100}%",
"${contrast * 100}%",
"${hue}deg",
"${opacity * 100}%",
"${saturate * 100}%",
"${sepia * 100}%",
];
}