web_ui_plugin

🚀 WebUI Plugins: The SaaS Builder's Dream

Building SaaS applications doesn't have to be complex. WebUI Plugins is a modular, plug-and-play framework for Flutter Web that brings professional design and functionality without the architectural headache.

What makes it different?

• ✨ Minimal Setup — Define your data models and UI, let the framework handle the rest.
• 🔄 Automatic Magic — Automatically generates forms, validation, and data handling logic.
• ⚡ Production-Ready — Built with Firebase integration out of the box.
• 🎨 Web-Grade UI — Professional, responsive design that feels native to the browser.
• 📦 Truly Modular — Register plugins, build features independently, and scale effortlessly.

Perfect for: Bootstrapped founders, indie hackers, and dev teams who want to ship SaaS faster without sacrificing quality.

---

The 4-Step Developer Experience

1. Define your Data Model

class PetOwnerModel extends DataModel {
  final String? id, name, mobile;
  PetOwnerModel({this.id, this.name, this.mobile});
  @override Map<String, dynamic> toJson() => {'id': id, 'name': name, 'mobile': mobile};
  factory PetOwnerModel.fromJson(Map<String, dynamic> json) => ...;
  @override String? get uid => id;
}

2. Create the Declarative UI

Use FormPageView with WidgetConfig. The framework handles the layout and state automatically.

initialTabDetailBuilder: (item, ctx) => FormPageView(
  fields: [
    WidgetConfig(key: 'name', fieldType: FieldType.name, labelText: 'Full Name'),
    WidgetConfig(key: 'mobile', fieldType: FieldType.mobileNumber, labelText: 'Mobile'),
  ],
  rebuildDataModel: (data) => PetOwnerModel.fromJson(data),
)

3. Register the Plugin Descriptor

Define identity, permissions, and routing in a single object.

final petOwnerPlugin = PluginDescriptor<PetOwnerModel>(
  moduleId: 'pet-owners',
  title: 'Pet Owners',
  icon: Icons.person,
  dataBinding: PluginDataBinding<PetOwnerModel>(
    collectionName: 'petOwners',
    fromJson: PetOwnerModel.fromJson,
    createEmpty: PetOwnerModel.new,
  ),
  routes: [ ... ],
);

4. Bootstrap and Run

Initialize the framework and register your plugins in main.dart.

void main() async {
  await AppBootstrap.initialize(config: BootstrapConfig(...));
  await AppBootstrap.registerPlugins([petOwnerPlugin]);
  runApp(AppBootstrap.buildRouterApp(
    title: 'My SaaS App',
    shellBuilder: (context, child) => MyShell(child: child),
  ));
}

---

🏗️ Feature Status (Current State)

• ✅ Modular Registry: Plugin system is fully operational.
• ✅ Firebase Integration: Firestore CRUD and Realtime streams are live.
• ✅ Permission System: Persona-based sidebar and route gating is live.
• ✅ Scoped Repositories: Individual data isolation per plugin (Backlog #4 Fixed).
• 🚧 Image Uploads WORK IN PROGRESS: UploadCapability contract is defined; Firebase Storage adapter implementation is underway.
• 🚧 Theme Engine & Dark Mode WORK IN PROGRESS: Base theming is available; automatic switching and deep customization are being refined.

---

Core Framework Architecture

• PluginRegistry: Central source of truth for all modules.
• ScopedRepo: Isolated data access layer per module (Backend-agnostic).
• SectionWidget: High-performance two-pane master/detail layout.
• PermissionMiddleware: Dual-layer security (Sidebar visibility + Route guards).

Roadmap 🛣️

12. Known Issues & Improvement Backlog

Issues found during architecture review (April 2026). Ordered by severity.

#1 — DataModel.uid typed String? but semantically required — MEDIUM

File: lib/src/core/contracts/data_model.dart Problem: String? get uid; // not null — the comment contradicts the type. Every downstream lookup (item.uid == id) must null-check unnecessarily. Fix: Change to String get uid. All concrete models must provide a non-null uid, surfacing missing IDs at compile time.

#2 — UploadCapability stored in BootstrapConfig but never injected into plugins — MEDIUM

File: lib/src/core/bootstrap/app_bootstrap.dart Problem: BootstrapConfig.uploadCapability is accepted but never passed to FormCubit or PluginDescriptor. Plugins that declare supportsUpload: true have no access to the capability at runtime. Fix: Pass uploadCapability through AppBootstrap._buildCubits or expose it via a RepositoryProvider<UploadCapability>.

#4 — FormRepoMixin.update and FormCubit.updateItem expose an index — MEDIUM

Files: form_repo_mixin.dart, form_cubit.dart Problem: update(int index, T item) — callers must track a list position. The underlying service finds items by id, not index; the index only updates the local cache. Fix: Change signature to update(T item) and find the cache index internally via items.indexWhere((e) => e.uid == item.uid).

#5 — ScopedRepo uses (service as dynamic).collectionName — MEDIUM

File: lib/src/adapters/firebase/scoped_repo.dart Problem: Dynamic cast to read collectionName silently falls back to T.toString() if the cast fails, producing a wrong registry key. Fix: Define abstract interface CollectionNamed { String get collectionName; }, implement it on FirestoreService, and cast to CollectionNamed instead of dynamic.

#6 — No onError handler on realtime stream subscriptions — MEDIUM

Files: section_cubit.dart, form_repo_mixin.dart Problem: _repoStream.listen((data) { ... }) has no onError callback. A Firestore permission error or network failure silently cancels the subscription with no state update. Fix: Add onError: (error) => emit(state.copyWith(status: SuccessStatus.failure)) (and equivalent in FormRepoMixin).

#7 — SectionState.addedItemId skips the sentinel pattern in copyWith — LOW

File: lib/src/core/section/cubit/section_state.dart Problem: Every call to copyWith(searchText: 'x') silently resets addedItemId to null because it does not fall back to this.addedItemId. Fix: Apply the same static const Object _unset sentinel pattern used by selectedItem and fromDate.

#8 — Globals.hasUnsavedFormChanges is a mutable global static — MEDIUM

File: lib/src/core/contracts/globals.dart Problem: FormPageView writes this flag and PluginLeftNavigation reads it, but nothing reacts to changes — no stream, no notifier. The flag can also become stale between page navigations. Fix: Move hasUnsavedChanges into FormCubit's state (or a ValueNotifier). Navigation widgets subscribe to it reactively instead of polling a global.

Application Images

| | | |

-- firebase emulators:start --import=./emulator-data --export-on-exit