import "package:u/utilities.dart";

That one line brings in Flutter's material library plus every component, utility, extension, enum, API service, and native feature below. No barrel juggling, no dozens of small imports.

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Why u?

• One import, everything. UI kit, formatters, date/Jalali tools, storage, navigation, an API layer, and native features — all re-exported from package:u/utilities.dart.
• Consistent, themed UI. UText*, UButton, UTextField, UScaffold, UCard, UColumn, URow, and 40+ more components that read from your ThemeData and stay visually coherent.
• Context-free helpers. UToast, UNavigator, and ULoading work from anywhere — no BuildContext needed.
• A typed network layer. UServices.<area>.<method>(...) with success / error / exception callbacks, automatic token handling, and JWT refresh.
• Persian / Iran first-class. Jalali dates, Persian ⇄ Latin digits, Rial/Toman money formatting, phone-operator detection, national-code validation, license-plate input.
• Native platform features. Screenshot / screen-recording prevention (ScreenGuard) with a clean, extensible plugin-folder convention for adding more.

Platform support

Feature area	Android	iOS	Web	macOS	Windows	Linux
UI / utils / extensions	✅	✅	✅	✅	✅	✅
API layer (UServices)	✅	✅	✅	✅	✅	✅
ScreenGuard	✅	✅	⬜	✅	✅	⬜
AR (UArScene, …)	✅	✅	✅	⬜	⬜	⬜
3D viewer (U3DViewer)	✅	✅	✅	⬜	⬜	⬜

⬜ = safe no-op (no OS API to prevent capture).

Install

dependencies:
  u:
    git:
      url: https://github.com/SinaMN75/U_flutter.git

Requires Flutter ≥ 3.44.8 and Dart SDK ≥ 3.12.2.

Quick start

import "package:u/utilities.dart";

void main() {
  // Point the API layer at your backend (only if you use UServices).
  U.baseUrl = "https://api.example.com";
  U.apiKey = "YOUR_API_KEY";
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) => MaterialApp(
    // Lets UToast / UNavigator / ULoading work without a BuildContext.
    navigatorKey: navigatorKey,
    // u widgets read localized strings via U.s — register the delegate.
    localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
      S.delegate,
      GlobalMaterialLocalizations.delegate,
      GlobalWidgetsLocalizations.delegate,
      GlobalCupertinoLocalizations.delegate,
    ],
    supportedLocales: S.delegate.supportedLocales,
    home: const HomePage(),
  );
}

What's inside

Text — UText*

A widget per Material 3 type-scale role: UTextDisplayLarge/Medium/Small, UTextHeadline*, UTextTitle*, UTextBody*, UTextLabel*, plus UAnimatedCounter. The string is positional; styling (color, weight, maxLines, decoration…) is named.

UTextTitleLarge("Welcome", fontWeight: FontWeight.w700);
UTextBodyMedium("Body text", color: Theme.of(context).colorScheme.onSurfaceVariant);

Buttons — UButton

Every style via UButtonType (elevated, text, outlined, icon, fab, cupertino, custom), with icons, gradients, loading/disabled states, and a built-in tap counter. Also UButtonSubmitCancel, UPressable, USendAgainCountDown.

UButton(title: "Save", isLoading: saving, onTap: save);

Inputs

UTextField, UTextFieldPhoneNumber, UTextFieldDatePicker, UTextFieldAutoComplete(Async), UDropDownField, UCountryProvincePicker, UOtpField, UPlateField (Iranian plate), UChipChoice, USegmentedControl, USlider, URichTextEditor, USignaturePad, and UJalaliDatePicker.show(type: ...) for the Jalali calendar in three flavours (classic, material, spinner), and UValidators (email, phone, length, national code, …) for validator:.

Layout & scaffolding

UScaffold, UContainer, UColumn, URow (Column/Row with spacing + decoration built in), UCard, UGlassCard, UHeaderCard, UListView, UListTile, UTabBar, USideMenu, UEmptyState, UErrorRetry.

Feedback — context-free

UToast.success/error/warning/info, UNavigator.confirmAsync/inputDialog/bottomSheet/dialog, ULoading.show/dismiss, UProgressLinear/Circular, RatingBar.

Media, files & viz

UImage (network/asset/file/memory), CachedNetworkImage, UImageViewer, UFilePicker, UScanner (QR/barcode), UBarcode, UPdfViewer, UHtmlView, UWebView, UCreditCard, UCartesianChart, UGauge, percent indicators, UJsonViewer, UMap, UChat, UProcessView (multi-step form engine), WidgetToImage.

Formatters & extensions

Call directly on values:

1500000.rial();                 // "1,500,000 ﷼"
1500000.toman();                // Toman formatting
1250000.toKMB();                // "1.25M"
1234567.separate3By3();         // "1,234,567"
"2026-08-01".toPersianNumber(); // Persian digits
DateTime.now().toJalaliDate();  // Jalali date
someDate.toTimeAgo();           // "3 hours ago"

Widget sugar makes layouts fluent:

myWidget.pAll(16).onTap(onPress).card();   // Padding → tappable → card
row.rtl();                                  // right-to-left subtree

There are also rich String, int/double, Iterable, Map, DateTime, and TextEditingController extensions.

API layer — UServices

One shape for every call: UServices.<area>.<method>(p:, onOk:, onError:, onException:).

await UServices.auth.login(
  p: ULoginParams(email: email, password: password),
  onOk: (UResponse<ULoginResponse> r) => UNavigator.push(const HomePage()),
  onError: (UEmptyResponse e) => UToast.error(message: e.message ?? "Login failed"),
  onException: (String e) => UToast.error(message: e),
);

31 service areas: auth, user, product, content, category, comment, follow, media, wallet, ipg, txn, merchant, terminal, bankAccount, moadi, inquiry, chargeInternet, sim, vehicle, parking, hotel, ticket, notification, pn, blog, address, accounting, appSettings, dashboard, process, fileManager — each with matching *Params / *Response models. Payment/IPG flows included.

ScreenGuard — native screenshot / recording prevention

await ScreenGuard.enable();   // block capture
await ScreenGuard.disable();  // allow again

ScreenGuard.onScreenshot = () => log("screenshot taken");
ScreenGuard.onScreenRecording = (bool active) => setState(() => recording = active);

Implemented natively per platform: FLAG_SECURE (Android), secure-field + detection callbacks (iOS), NSWindow.sharingType = .none (macOS), WDA_EXCLUDEFROMCAPTURE (Windows). Linux and web are safe no-ops.

Each native feature lives in a self-contained folder with its own method channel u/<feature>, so adding another native capability is a well-defined, repeatable change.

AR & 3D — UArScene, U3DViewer, UArGeoView, …

No pub packages: ARCore + a built-in OpenGL ES 3 glTF renderer on Android, ARKit + RealityKit on iOS, WebXR + a built-in WebGL2 renderer on the web. Setup per platform is documented at the top of lib/components/u_ar.dart (Android needs implementation("com.google.ar:core:1.45.0") in the app).

// Place products on floors, tables or walls; move / rotate / scale, photo and video.
UArExperiences.place(items: <UArPlaceable>[
  UArPlaceable(id: "sofa", title: "Sofa", source: UArSource.url("https://…/sofa.glb"), iosSource: UArSource.url("https://…/sofa.usdz")),
]);

// 3D product viewer with hotspots and a "View in AR" button (no permission needed).
U3DViewer(source: UArSource.asset("assets/chair.glb"));

// Shop / landmark cards around the user (visual positioning or GPS + compass).
UArExperiences.places(places: <UArPlace>[UArPlace(id: "cafe", latitude: 35.7, longitude: 51.4, title: "Cafe")]);

// Also: UArMeasure, UArFaceTryOn, UArImageTrigger, UArCodeView, UAr.scanRoom, UAr.captureObject,
// UAr.openNativeViewer — or drive everything yourself with UArController + UArView.

Downloads & storage — UDownloadManager, UFileStorage

One engine for every kind of download on all six platforms: silent fetches, a persistent IDM-style queue with segmented (multi-connection) transfers, pause/resume across restarts, checksums, mirrors, speed limits, wifi-only rules and scheduling.

// Silent, in memory.
final Uint8List bytes = await UDownloadManager.instance.fetchBytes(url);

// Into the user's Downloads (MediaStore / Files app / ~/Downloads / the browser).
await UDownloadManager.instance.download(url);

// Encrypted while downloading — plaintext never touches the disk.
await UDownloadManager.instance.enqueue(UDownloadRequest(url: url, destination: const UDownloadDestination.vault("lesson-1")));

// Hidden source: resolve an id to a (signed, short-lived) URL per attempt; the URL is never stored.
UDownloadManager.instance.urlResolver = (UDownloadTask task) async => (await api.signedUrl(task.request.sourceId!)).url;
await UDownloadManager.instance.enqueue(const UDownloadRequest(sourceId: "file-42", connections: 8));

// OS-owned: keeps going after the app is killed (DownloadManager / background URLSession / BITS).
await UDownloadManager.instance.enqueue(UDownloadRequest(url: url, useSystemDownloader: true));

// UI
UNavigator.push(const UDownloadManagerPage());
UDownloadButton(request: UDownloadRequest(url: url));

UFileStorage stores keyed files in four buckets — support (private, persistent), cache (size-capped LRU), vault (encrypted at rest, per-file keys, master key in Keystore / Keychain / Credential Manager / Secret Service / WebCrypto) and temp — with expiry, MIME types, checksums, streaming and ranged reads. On the web everything lives in IndexedDB.

Host-app setup:

• iOS — to show downloads in the Files app, add UIFileSharingEnabled and LSSupportsOpeningDocumentsInPlace (both true) to Info.plist.
• macOS — sandboxed apps need com.apple.security.files.downloads.read-write (Downloads) and com.apple.security.files.user-selected.read-write ("save as") entitlements, plus com.apple.security.network.client.
• Android — nothing to add: the plugin declares the dataSync foreground service, the FileProvider and WRITE_EXTERNAL_STORAGE (API ≤ 28 only). Ask for POST_NOTIFICATIONS on Android 13+ if you want the progress notification to be visible.
• Linux — install libsecret-1-dev at build time to keep the vault key in the Secret Service; without it the key falls back to a private file.
• Web — cross-origin downloads need CORS, and segmented downloads need Access-Control-Expose-Headers: Content-Range, Accept-Ranges, ETag.

u_admin

A complete GetX-based admin panel bundled with the plugin (login, dashboards, blog, CMS, file manager, hotel/dorm suite, parking, payments, wallet, users, logs, push, settings). Reuse the pages (UAdminSplashPage, UAdminLoginPage, …) instead of rebuilding admin screens.

Complete API reference

Everything below is exported from the single package:u/utilities.dart import.

Components — Text

UTextDisplayLarge · UTextDisplayMedium · UTextDisplaySmall · UTextHeadlineLarge · UTextHeadlineMedium · UTextHeadlineSmall · UTextTitleLarge · UTextTitleMedium · UTextTitleSmall · UTextBodyLarge · UTextBodyMedium · UTextBodySmall · UTextLabelLarge · UTextLabelMedium · UTextLabelSmall · UAnimatedCounter

Components — Buttons & inputs

UButton · UButtonSubmitCancel · UPressable · USendAgainCountDown · UTextField · UDropDownField · UTextFieldDatePicker · UTextFieldAutoComplete · UTextFieldAutoCompleteAsync · UTextFieldPhoneNumber · UOtpField · UPlateField · UChipChoice · USegmentedControl · USlider · UCategorySelector · UCountryProvincePicker · UCurrencyInputFormatter · URichTextEditor · USignaturePad

Components — Layout & navigation

UScaffold · UContainer · UColumn · URow · UCard · UGlassCard · UHeaderCard · UListView · UListTile · UDefaultTabBar · UIconTextHorizontal · UIconTextVertical · UIconBackground · UImageBackground · UIconPrimary · UEmptyState · UErrorRetry · UAnimationCard · USideMenu (USideMenuController, USideMenuTheme, UMenuItem, UMenuGroup, UMenuHeader) · UTabBar (UTab, UTabBarTheme)

Components — Feedback & indicators

UProgressLinear · UProgressCircular · CircularPercentIndicator · LinearPercentIndicator · RatingBar · RatingBarIndicator · BadgeWidget · UProgress

Components — Media & files

UImage · UImageNetwork · UImageAsset · UImageFile · UImageMemory · CachedNetworkImage · UImageViewer · BetterImageViewer · ImageGalleryViewer · UFilePicker · UScanner (UScannerPage) · UBarcode · UPdfViewer · UHtmlView · UWebView · WidgetToImage

Components — Data viz & motion

UCartesianChart · UGauge (UGaugeRange, UGaugeAnnotation) · UJsonViewer · UNumberPagination · UMap · UChat · FlipCard · ReadMoreText · ScrollingText · CreditCardWidget (CreditCardForm, CreditCardModel, CardBrandDetector) · JalaliDatePickerDialog · UJalaliDatePicker (UJalaliDatePickerType) · UJalaliDatePickerMaterial · UJalaliDatePickerSpinner

Components — Process engine

UProcessView · UProcessController · UProcessFields · UProcessStepsIndicator · UProcessTextField · UProcessImagePickerField · UProcessESignField · UProcessVisualAuthField · UProcessStyle

Utilities (abstract/static classes)

Class	Purpose
U	App root config: baseUrl, apiKey, user, contents, categories, tabs, s (l10n)
UServices	Entry point to all 31 API service areas
UHttpClient	Low-level HTTP: send, upload, multipart, progress
UDownloadManager	Segmented, resumable downloads to memory, storage, the vault, Downloads, a path or "save as"
ULocalStorage / UFileStorage	Key-value + bucketed file storage (support, LRU cache, encrypted vault, temp)
UNavigator	push/off/offAll, dialog, alert, confirm(Async), inputDialog, bottomSheet, datePicker, colorPicker, timePicker, overlays
UToast	success/error/warning/info, snackBar, banner, toast
ULoading	Global blocking spinner: show, dismiss, isShowing
UValidators	required, email, phone, minLength/maxLength/exactLength, iranianNationalCode, url, password, complexPassword, match, pattern, numberRange
UEncryption	AES/Salsa20/Fernet, base64/hex, md5/sha1/sha256/384/512, HMAC, key/iv gen
PersianTools	National-code/card validation, bank lookup, Sheba, number↔words, digit conversion, phone details
UPhoneNumberUtils	normalizePhone, operator/SIM detection
Jalali / Gregorian / DateFormatter	Shamsi ⇄ Gregorian conversion and formatting
ULaunch	launchURL, call, sms, WhatsApp/Telegram/Instagram/maps/email
UShare	Share text/link/files/bytes/widget image
UClipboard	set, getText
ULocation	getUserLocation (geolocator)
UNetwork	hasWifi/Cellular/Vpn/Ethernet/Bluetooth/NetworkConnection
UNotification	Local notifications
UCrashlytics	Error reporting
UApp	Orientation/size/form-factor helpers, theme + locale switch
UUUID	uuidV1/V4/V5/V6/V7/V8
UConstants	Shared constants, loremPicsum
UUpdateDialog	Force/soft update flow
UDebouncer	Debounce callbacks

Extensions (available globally after import)

On	Highlights
Widget	pAll/pSymmetric/pOnly, onTap/onTapInk/onLongPress/onDoubleTap, expanded/fit, ltr/rtl, scale/rotate/translate/position, safeArea/form/scrollable, card/container, showMenus, full alignAt* family
String / String?	money (rial/toman), Jalali (toJalaliDate/DateTime), toPersianNumber/toLatinNumber, separateNumbers3By3, isNullOrEmpty/isNumeric, toInt/toDouble, maxLength, getDay/Month/Year, toTimeAgo
int / double (+ nullable)	rial/toman/rialToToman, separate3By3, toKMB, toStringAsSmartRound, secondsToTimeLeft, month names
num	toBKMG
Iterable<T> / Iterable<T>?	mapIndexed, forEachIndexed, firstOrDefault, containsAll/Any, isNullOrEmpty, addAndReturn, insertAndReturn, takeIfPossible
Map<K,V>	add(k, v) (chainable request-body builder)
DateTime	formatDate, toJalali(Date/DateTime), toTimeAgo, utcNow
TextEditingController	numString/numInt/numDouble, valueOrNull, isNullOrEmpty
Uint8List	toBase64/toBase64Url

API services (UServices.<area>)

auth · user · product · content · category · comment · follow · media · wallet · ipg · txn · merchant · terminal · bankAccount · moadi · inquiry · chargeInternet · sim · vehicle · parking · hotel · ticket · notification · pn · blog · address · accounting · appSettings · dashboard · process · fileManager

Example

A full multi-page gallery app lives in example/ demonstrating every area above, each with a live widget and the exact code that produced it.

cd example
flutter run          # mobile
flutter run -d chrome
flutter run -d macos

Conventions

Projects using u follow a few house rules (enforced by analysis_options.yaml): theme colors only (no hard-coded Colors.*), double quotes, explicit types, const/final where possible, and localized strings via U.s for anything user-facing.

License

MIT © SinaMN75