Flutter 如何在Flatter中为自定义背景色创建全局类

我有一个像这样的背景色

Container(
        decoration: BoxDecoration(
            gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [Colors.red, Colors.blue])));

class AppConstants {

  static const BoxDecoration myBoxDecoration = BoxDecoration(
  gradient: LinearGradient(
  begin: Alignment.topLeft,
  end: Alignment.bottomRight,
  colors: [Colors.red, Colors.blue]));

}

child: Container(decoration: AppConstants.myBoxDecoration),

---

在我的例子中，我有3个屏幕，我想将我的自定义背景应用到我所有的屏幕上，有没有办法将我的上述代码声明为一个类，以便我可以在需要时调用它到我的屏幕上

Container(
        decoration: BoxDecoration(
            gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [Colors.red, Colors.blue])));

class AppConstants {

  static const BoxDecoration myBoxDecoration = BoxDecoration(
  gradient: LinearGradient(
  begin: Alignment.topLeft,
  end: Alignment.bottomRight,
  colors: [Colors.red, Colors.blue]));

}

child: Container(decoration: AppConstants.myBoxDecoration),

像这样使用它

Container(
        decoration: BoxDecoration(
            gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [Colors.red, Colors.blue])));

class AppConstants {

  static const BoxDecoration myBoxDecoration = BoxDecoration(
  gradient: LinearGradient(
  begin: Alignment.topLeft,
  end: Alignment.bottomRight,
  colors: [Colors.red, Colors.blue]));

}

child: Container(decoration: AppConstants.myBoxDecoration),

---

非常感谢你，这对我很有帮助