Add copyWith feature to Paint #142871
Description
Use case
When painting to a canvas I find myself reusing very similar Paint object with just one field tweaked. For example, multiple Paints with the same stroke/strokeWidth, but with a different colour. Making a decision to change the strokeWidth could be error prone. For example:
final item1Stroke = Paint()
..color = Colors.red
..style = PaintingStyle.stroke
..isAntiAlias = false
..strokeWidth = 10;
final item2Stroke = Paint()
..color = Colors.green
..style = PaintingStyle.stroke
..isAntiAlias = false
..strokeWidth = 10;
final item3Stroke = Paint()
..color = Colors.blue
..style = PaintingStyle.stroke
..isAntiAlias = false
..strokeWidth = 10;Proposal
Instead add a copyWith method, for example:
final defaultStroke = Paint()
..style = PaintingStyle.stroke
..isAntiAlias = false
..strokeWidth = 10;
final item1Fill = defaultStroke.copyWith(
color: Colors.red
);
final item2Fill = defaultStroke.copyWith(
color: Colors.blue
);
final item3Fill = defaultStroke.copyWith(
color: Colors.green
);This proposal was filed previously: #40497 but that issue was closed without explaination, and at that time had 21 thumbs up (if that's any kind of signal).