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feat(ui_storage): add StorageListView and PaginatedLoadingController (#…
…11170) * feat(ui_storage): add StorageListView and PaginatedLoadingController * drop uuid * license header
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40 changes: 40 additions & 0 deletions
40
packages/firebase_ui_storage/example/lib/src/list_view_app.dart
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// Copyright 2023, the Chromium project authors. Please see the AUTHORS file | ||
// for details. All rights reserved. Use of this source code is governed by a | ||
// BSD-style license that can be found in the LICENSE file. | ||
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import 'package:firebase_storage/firebase_storage.dart'; | ||
import 'package:firebase_ui_storage/firebase_ui_storage.dart'; | ||
import 'package:flutter/material.dart'; | ||
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import 'apps.dart'; | ||
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class StorageListViewApp extends StatelessWidget implements App { | ||
const StorageListViewApp({super.key}); | ||
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@override | ||
String get name => 'StorageListView'; | ||
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@override | ||
Widget build(BuildContext context) { | ||
return StorageListView( | ||
ref: FirebaseStorage.instance.ref('list'), | ||
itemBuilder: (context, ref) { | ||
return ListTile( | ||
title: FutureBuilder( | ||
future: ref.getData(), | ||
builder: (context, snapshot) { | ||
if (snapshot.hasError) { | ||
return Text(snapshot.error.toString()); | ||
} | ||
if (snapshot.hasData) { | ||
return Text(snapshot.data.toString()); | ||
} | ||
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return const Text('Loading...'); | ||
}, | ||
), | ||
); | ||
}, | ||
); | ||
} | ||
} |
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104 changes: 104 additions & 0 deletions
104
packages/firebase_ui_storage/lib/src/paginated_loading_controller.dart
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// Copyright 2023, the Chromium project authors. Please see the AUTHORS file | ||
// for details. All rights reserved. Use of this source code is governed by a | ||
// BSD-style license that can be found in the LICENSE file. | ||
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import 'package:firebase_storage/firebase_storage.dart'; | ||
import 'package:flutter/foundation.dart'; | ||
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/// A base class for loading states. | ||
sealed class PaginatedLoadingState { | ||
const PaginatedLoadingState(); | ||
} | ||
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/// Indicates that the first page is loading. | ||
class InitialPageLoading extends PaginatedLoadingState { | ||
const InitialPageLoading(); | ||
} | ||
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class PageLoading extends PaginatedLoadingState { | ||
final List<Reference> items; | ||
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const PageLoading({required this.items}); | ||
} | ||
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class PageLoadComplete extends PaginatedLoadingState { | ||
final List<Reference> pageItems; | ||
final List<Reference> items; | ||
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const PageLoadComplete({ | ||
required this.pageItems, | ||
required this.items, | ||
}); | ||
} | ||
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class PageLoadError extends PaginatedLoadingState { | ||
final Object? error; | ||
final List<Reference>? items; | ||
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const PageLoadError({ | ||
required this.error, | ||
this.items, | ||
}); | ||
} | ||
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class PaginatedLoadingController extends ChangeNotifier { | ||
int pageSize; | ||
final Reference ref; | ||
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PaginatedLoadingController({ | ||
required this.ref, | ||
this.pageSize = 50, | ||
}) { | ||
load(); | ||
} | ||
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PaginatedLoadingState? _state; | ||
PaginatedLoadingState get state => _state!; | ||
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ListResult? _cursor; | ||
List<Reference>? _items; | ||
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ListOptions get _listOptions { | ||
return ListOptions( | ||
maxResults: pageSize, | ||
pageToken: _cursor?.nextPageToken, | ||
); | ||
} | ||
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Future<void> load() { | ||
_state = _state == null | ||
? const InitialPageLoading() | ||
: PageLoading(items: _items!); | ||
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notifyListeners(); | ||
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return ref.list(_listOptions).then((value) { | ||
_cursor = value; | ||
(_items ??= []).addAll(value.items); | ||
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_state = PageLoadComplete( | ||
pageItems: value.items, | ||
items: _items!, | ||
); | ||
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notifyListeners(); | ||
}).catchError((e) { | ||
_state = PageLoadError( | ||
error: e, | ||
items: _items, | ||
); | ||
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notifyListeners(); | ||
}); | ||
} | ||
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bool shouldLoadNextPage(int itemIndex) { | ||
return switch (state) { | ||
InitialPageLoading() => false, | ||
PageLoading() => false, | ||
PageLoadComplete(items: final items) => | ||
itemIndex == (items.length - pageSize + 1), | ||
PageLoadError() => false, | ||
}; | ||
} | ||
} |
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