How to make a customizable color menu for flutter app?

Question

I'd like to make an external dart file (let's call it color_palette.dart), that have some classes of colors. These classes would be able to be changed by a menu on another page of the app. These colors would be used in all the pages to define the colors of Appbar, buttons, icons, etc... I don't want to use the theme() for it. I want to use some functions that can be used in a button (onPress : function) to change the colors.

Here is an example :

color_palette.dart

class myColor {
return Colors.red;
}

mainpage.dart

Scaffold(
appbar : AppBar(
  color : MyColor(),
  )
)

Answer 1

very easy to do

    void main() {
      
      //change color A from red to purple
      MyColors.colorA = Colors.purple;
          
    }
    
    class MyColors {
      static Color colorA = Colors.red;
      static Color colorB = Colors.green;
      static Color colorC = Colors.blue;
    }

---

Scaffold(
appbar : AppBar(
  color : MyColors.colorA,
  )
)