flutter_helper_kit #

A production-ready Flutter utility kit — extensions, widgets, animations, responsive sizing, and utils in one package with zero external dependencies (Flutter SDK only).

Consolidates helpers previously spread across custom_helper folders (Paydrop, WhereToNow, etc.) into a single maintainable package.

Platforms: Android · iOS · Web · macOS · Windows · Linux

Installation #

dependencies:
  flutter_helper_kit: ^1.0.6

flutter pub add flutter_helper_kit

import 'package:flutter_helper_kit/flutter_helper_kit.dart';

Modular imports (smaller compile surface) #

import 'package:flutter_helper_kit/flutter_helper_kit_extensions.dart';
import 'package:flutter_helper_kit/flutter_helper_kit_widgets.dart';
import 'package:flutter_helper_kit/flutter_helper_kit_animation.dart';
import 'package:flutter_helper_kit/flutter_helper_kit_responsive.dart';
import 'package:flutter_helper_kit/flutter_helper_kit_utils.dart';

Package structure #

Every feature maps to a lib/ path. Use this table to find the right file.

Module	Source path	Key APIs
Extensions	`lib/extensions/`	String, Color, DateTime, List, Map, Widget, Context, Alignment, Type conversion
Widgets	`lib/widgets/`	AppButton, SliderButton, ReadMore, FlutterTag, Sharp corners, Pagination, etc.
Animation	`lib/animation/`	75+ `animateWidget*`, list animations, `AnimatedGestureDetector`
App Responsive	`lib/app_responsive/`	`ScreenUtilInit`, `.w`, `.h`, `.sp`, `.r`, `RPadding`, `RSizedBox`
Reactive	`lib/reactive/`	`RxDateTime`, `RxnDateTime` (ValueNotifier-based)
Utils	`lib/utils/`	`timeAgoCalculated`, `RandomImage`, `SystemUiUtils`, `MapCustomInfoWindow`
Formatters	`lib/text_field/`	`NoLeadingSpaceFormatter`, `NoSpaceFormatter`
Custom Painter	`lib/custom_painter/`	`GoogleLogoWidget`

Full single import via flutter_helper_kit.dart.

Example app #

Runnable demos for every module — each screen shows source file + API names.

cd example
flutter run

See example/README.md for catalog structure and how to add new demos.

Quick start #

Responsive sizing (`app_responsive/`) #

ScreenUtilInit(
  designSize: const Size(360, 690),
  builder: (_, child) => MaterialApp(home: child),
  child: Builder(
    builder: (context) => Container(
      width: 200.w,
      height: 80.h,
      child: Text('Hello', style: TextStyle(fontSize: 16.sp)),
    ),
  ),
);

API	File
`.w`, `.h`, `.sp`, `.r`, `.sw`, `.sh`	`app_responsive/size_extension.dart`
`ScreenUtilInit`	`app_responsive/screenutil_init.dart`
`RPadding`, `RSizedBox`	`app_responsive/r_padding.dart`, `r_sized_box.dart`

Widget animations (`animation/`) #

Text('Hello')
  .animateWidgetElasticEntry()
  .animateWidgetGlassReveal();

// List item stagger
ListTile(title: Text('Item'))
  .animateListEntry(index: 0);

// Tap feedback
AnimatedGestureDetector(
  effectPreset: TapEffect.bounce,
  onTap: () {},
  child: Icon(Icons.favorite),
);

API	File
`animateWidget*` (75+ methods)	`animation/widget_animation_extensions.dart`
`animateList*`	`animation/list_item_animations.dart`
`AnimatedGestureDetector`	`animation/animated_gesture_detector.dart`
`animateSheetReveal`	`animation/animations_bottom_sheet.dart`

Extensions #

'edit_item'.toSnakeCase();           // string_case.dart
'user@mail.com'.isValidateEmail();  // validation.dart
1.50.toStringAsSmartRounded();       // smart_round_to_string.dart
Colors.blue.withColorOpacity(0.5);   // color_extension.dart
DateTime.now().timeAgo();            // date_extension.dart
'42'.toInt();                        // type_conversion.dart (on Object?)
context.showSnackBar(title: Text('Hi')); // build_context_extension.dart

Widgets #

// Slider with shimmer label
SliderButton(
  width: 300,
  label: Text('Slide to confirm'),
  action: () async => true,
);

// Password strength meter
PasswordStrengthIndicator(textController: controller);

// Enhanced read-more with regex annotations
ReadMoreTextEnhanced(longText, trimLines: 3, annotations: [...]);

// iOS-style sheets (pass BuildContext)
AppCupertinoActionSheet.showActionSheet(
  context: context,
  actions: [ActionSheetItem(value: 'a', label: 'Option A')],
);

// Animated digit counter
UniversalDigitCounter(value: 12345, type: DigitAnimationType.simple);

// Ticket shape clipper
TicketClipper(
  clipper: PointedEdgeClipper(),
  child: Container(color: Colors.orange),
);

// Infinite scroll list
ListViewPagination(
  itemCount: items.length,
  hasNext: hasMore,
  nextData: fetchMore,
  itemBuilder: (_, i) => ListTile(title: Text(items[i])),
);

Widget	File
`AppButton`	`widgets/app_button.dart`
`SliderButton`	`widgets/slider_button.dart`
`PasswordStrengthIndicator`	`widgets/password_strength_indicator/`
`ReadMoreText` / `ReadMoreTextEnhanced`	`widgets/read_more_text.dart`, `read_more_enhanced.dart`
`FlutterTag`	`widgets/flutter_tag/`
`SharpBorderRadius`, `SharpClipRect`	`widgets/sharp_corners/`
`ListViewPagination`	`widgets/list_view_pagination.dart`
`CenterTextDivider`, `CustomBanner`	`widgets/center_text_divider.dart`, `custom_banner.dart`
`AvatarGlow`, `OutlineGlow`	`widgets/avatar_glow/`
`TicketClipper`	`widgets/ticket_clippers/`
`UniversalDigitCounter`	`widgets/rolling_digit/`

Reactive datetime (`reactive/`) #

final rx = RxDateTime.now();
rx.addDuration(const Duration(hours: 1));
print(rx.format('yyyy-MM-dd'));
print(rx.timeAgo());

No GetX required — built on ValueNotifier<DateTime>.

Utils #

timeAgoCalculated(DateTime.now().subtract(Duration(minutes: 5)));
RandomImage.picsumImage(300, 200);
RandomPicsumImage.image(width: 400, height: 300);
SystemUiUtils.setStatusBarColor(Colors.deepPurple);

Util	File
`timeAgoCalculated`	`utils/ago_time.dart`
`RandomImage`	`utils/random_image.dart`
`RandomPicsumImage`	`utils/random_picsum_image.dart`
`SystemUiUtils`	`utils/system_ui_utils.dart`
`MapCustomInfoWindow`	`utils/map_custom_info_window.dart`
`showDialogWithCloseIcon`	`utils/close_icon_show_dialog.dart`
`Validator`	`utils/password_validator.dart`
`Numeral`	`utils/numberal_utils.dart`

Map info window (callback adapter) #

No google_maps_flutter dependency in this package. Use CallbackMapInfoWindowAdapter:

final adapter = CallbackMapInfoWindowAdapter(
  onGetScreenCoordinate: (latLng) async {
    final coord = await googleMapController.getScreenCoordinate(
      LatLng(latLng.latitude, latLng.longitude),
    );
    return MapScreenCoordinate(coord.x, coord.y);
  },
);
controller.mapAdapter = adapter;

Text field formatters #

TextField(
  inputFormatters: [
    NoLeadingSpaceFormatter(),
    NoSpaceFormatter(),
  ],
);

Extensions reference #

String — extensions/string/

string_extension.dart — isEmptyOrNull, capitalize, reversed, parsing helpers
string_case.dart — toSnakeCase, toCamelCase, toPascalCase, toKebabCase, toTitleCase
validation.dart — isValidateEmail, validatePhone, extractPhoneNumber, URL/password checks

Color — extensions/color/color_extension.dart

toHex, createMaterialColor, lighten, darken, withColorOpacity, isDark, isLight

DateTime — extensions/date/

date_extension.dart — timeAgo, isToday, isYesterday, timezone helpers
date_format.dart — format(pattern:), formatTime()

List / Map / Set / Iterable — extensions/list/, map/, set/

firstOrNull, lastWhereOrNull, separatorEvery, getOrDefault, validate

Number — extensions/number/

integer_extension.dart, double_extension.dart, number_extension.dart
smart_round_to_string.dart — toStringAsSmartRounded()
height(), width(), circularBorderRadius spacing helpers

Widget / Context — extensions/widget/, context/

paddingAll, withSize, visible, expanded, centered
width, height, showSnackBar, theme, platform checks

Other

alignment/alignment_extensions.dart — isTop, isBottom, isLeft, isRight
type_conversion.dart — toInt, toDouble, toBool, toStr on Object?
bool/bool_extensions.dart — validate, toggle, toInt
duration/duration_extensions.dart — .delay
function/scope_functions_extension.dart — let, also, run, takeIf
random/random_extension.dart — random helpers on math.Random

Widgets reference #

UI & feedback

Widget	File	Description
`FlutterToast`	`flutter_toast.dart`	Toast messages
`CustomIndicator`	`custom_indicator.dart`	Loading overlay
`UnFocusable`	`hide_keyboard.dart`	Dismiss keyboard on outside tap
`DoublePressBackWidget`	`double_press_back_widget.dart`	Press back twice to exit
`TapSafeGesture`	`tap_safe_gesture.dart`	Debounced async tap
`TextShimmer`, `ProfileShimmer`, …	`simmer.dart`	Shimmer placeholders

Layout & display

Widget	File
`Space`, `SliverSpace`	`space/space.dart`, `sliver_space.dart`
`SeparatedColumn`	`separated_column.dart`
`FlutterListView`	`flutter_list_view.dart`
`DashDivider`	`dash_divider.dart`
`DottedBorderWidget`	`dotted_border_widget.dart`
`GradientText`	`gradient_text.dart`
`Marquee`	`marquee_widget.dart`
`TextAvatar`, `TextIcon`	`text_avatar.dart`, `text_icon_widget.dart`
`WidgetHelper`	`widget_helper.dart`

Forms & input

Widget	File
`RoundedCheckBox`	`rounded_checkbox_widget.dart`
`RatingBarWidget`	`rating_bar_widget.dart`
`TimerBuilder`	`timer_builder.dart`

Typedefs #

Callback types in utils/type_def.dart:

FutureVoidCallback, StringCallback, IntArgVoidCallback, DoubleCallback, and more.

Migration from custom_helper #

Before	After
`import '.../custom_helper.dart'`	`import 'package:flutter_helper_kit/flutter_helper_kit.dart'`
`Get.context` in Cupertino dialogs	Pass `context:` parameter
`Rx<DateTime>` (GetX)	`RxDateTime` / `RxnDateTime`
Google Maps `LatLng` in info window	`MapLatLng` + `MapInfoWindowAdapter`

Screenshots #

Flutter Toast #

Tap Safe Gesture #

Avatar Glow #

Outline Avatar Glow #

Avatar Glow MultiColor #

Outline Avatar Glow MultiColor #

App Button #

Marquee #

RatingBar #

Rounded Check Box #

Text Icon #

showDialogWithCloseIcon #

Sharp Borders #

Flutter Tag #

Contributing #

Issues & features: GitHub Issues
New widget/API: add under lib/, export in flutter_helper_kit.dart, register demo in example/lib/catalog/example_catalog.dart
Contact: sachin4kmt@gmail.com

If this package helps your project, consider giving it a star on GitHub.

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