Functions Utils in Dart

utils.dart

import 'package:flutter/material.dart';

//Example: https://stackoverflow.com/questions/26748605/how-to-store-function-as-class-member-variable?rq=
//In dart the functions can be Objects
///
typedef Widget BuilderState(
    BuildContext context, void Function(void Function()) setState);

double getScreenWidth(BuildContext context) =>
    MediaQuery.of(context).size.width;

double getScreenHeight(BuildContext context) =>
    MediaQuery.of(context).size.height;

//App colors
//Color primaryColor = ;

//Color acentColor = ;

//Color primaryColorDark = ;

///Remove the stack
nextRemoveWhole(BuildContext context, String route) =>
    Navigator.of(context).pushNamedAndRemoveUntil(route, (route) => false);

nextPage(BuildContext context, Widget widget) => Navigator.push(
    context,
    MaterialPageRoute(
      builder: (context) => widget,
    ));

///This could return anything
///
///If stateful is set to [true] this have to  use the builder Function
///
///Also the data to update should be outside from the state method
Future<dynamic> showDialogCustom(BuildContext context,
    {Widget dialog,
    BuilderState state,
    bool barrierDismissible = true,
    bool isStateful = false}) async {
  assert(dialog != null || state != null,
      'Remove dialog because isStateful is set to true');

  if (!isStateful) {
    return await showDialog(
      barrierDismissible: barrierDismissible,
      context: context,
      builder: (context) => dialog,
    );
  }

  return await showDialog(
    barrierDismissible: barrierDismissible,
    context: context,
    builder: (context) => StatefulBuilder(
      builder: state,
    ),
  );
}

String getDate() => DateTime.now().millisecondsSinceEpoch.toString();

back(BuildContext context) => Navigator.pop(context);