flutter.md

flutter

# create a project
flutter create $project

# clean deps
flutter clean

# get deps
flutter pub get

# run project
flutter run

# upgrade packages / fetch new master code from git source
flutter packages upgrade

cool widgets

https://api.flutter.dev/flutter/material/DefaultTabController-class.html

snippets

Cookbook

snackbar

// show
ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: const Text('Foo')))

// hide
ScaffoldMessenger.of(context).hideCurrentSnackBar();

unfocus

FocusScope.of(context).unfocus();

generation

// generate 100 widgets
List.generate(100, (index) {
  return Text('Item $index');
}

extension

// extend enum to be able to use foo.totext(), which converts the enum to a String
enum MyEnum {
  val1,
  val2,
  val3,
}

extension MyEnumExt on MyEnum {
  String toText() {
    String lower = describeEnum(this);

    return '${lower[0].toUpperCase()}${lower.substring(1)}';
  }
}

spread operator

// you can use ... to unpack lists and maps
List<int> a = [1, 2, 3];
List<int> b = [...a, 4, 5, 6];

misc

// asign value; default for null
bool foo = variable?? false;

// asign value depending on a condition
bool foo = condition ? cond_ok_value : cond_fail_value;