listColor function
Implementation
Color listColor(int? index) {
// retur color by index
if (index == null) {
return Colors.grey;
} else {
final colors = [
Colors.blue,
Colors.green,
Colors.red,
Colors.orange,
Colors.purple,
Colors.teal,
Colors.amber,
Colors.deepPurple,
Colors.indigo,
Colors.lightBlue,
Colors.lime,
Colors.yellow,
Colors.cyan,
Colors.deepOrange,
Colors.pink,
Colors.blueGrey,
];
return colors[index % colors.length];
}
}