feat(ui_storage): configuration API and UploadButton widget

packages/firebase_ui_shared/lib/src/loading_button.dart

@@ -33,10 +33,16 @@ class _LoadingButtonContent extends StatelessWidget {
     }
 
     if (isLoading) {
-      child = LoadingIndicator(
-        size: isCupertino ? 20 : 16,
-        borderWidth: 1,
-        color: color,
+      child = Stack(
+        alignment: Alignment.center,
+        children: [
+          Opacity(opacity: 0, child: child),
+          LoadingIndicator(
+            size: isCupertino ? 20 : 16,
+            borderWidth: 1,
+            color: color,
+          ),
+        ],
       );
     }
 
@@ -93,12 +99,17 @@ class LoadingButton extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final isMaterial3 = theme.useMaterial3;
+    final isCupertino = CupertinoUserInterfaceLevel.maybeOf(context) != null;
 
     final resolvedColor = variant == ButtonVariant.filled && !isMaterial3
         ? theme.colorScheme.onPrimary
         : null;
 
-    final contentColor = labelColor ?? resolvedColor;
+    var contentColor = labelColor ?? resolvedColor;
+
+    if (isCupertino && variant == ButtonVariant.filled) {
+      contentColor = contentColor ?? CupertinoColors.white;
+    }
 
     final content = _LoadingButtonContent(
       label: label,

packages/firebase_ui_shared/lib/src/loading_indicator.dart

@@ -31,18 +31,19 @@ class LoadingIndicator extends PlatformWidget {
 
   @override
   Widget? buildWrapper(BuildContext context, Widget child) {
-    return Center(
-      child: SizedBox(
-        width: size,
-        height: size,
-        child: child,
-      ),
+    return SizedBox(
+      width: size,
+      height: size,
+      child: child,
     );
   }
 
   @override
   Widget buildCupertino(BuildContext context) {
-    return const CupertinoActivityIndicator();
+    return CupertinoActivityIndicator(
+      radius: size / 2,
+      color: color,
+    );
   }
 
   @override

packages/firebase_ui_shared/lib/src/universal_button.dart

@@ -99,6 +99,7 @@ class UniversalButton extends PlatformWidget {
     } else {
       button = CupertinoButton.filled(
         onPressed: onPressed,
+        padding: EdgeInsets.zero,
         child: child,
       );
     }

packages/firebase_ui_shared/test/loading_indicator_test.dart

@@ -31,16 +31,5 @@ void main() {
         expect(find.byType(CupertinoActivityIndicator), findsOneWidget);
       },
     );
-
-    testWidgets(
-      'centered under both MaterialApp and CupertinoApp',
-      (tester) async {
-        await tester.pumpWidget(const MaterialApp(home: home));
-        expect(find.byType(Center), findsOneWidget);
-
-        await tester.pumpWidget(const CupertinoApp(home: home));
-        expect(find.byType(Center), findsOneWidget);
-      },
-    );
   });
 }

packages/firebase_ui_storage/.gitignore

@@ -0,0 +1,30 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+.packages
+build/

packages/firebase_ui_storage/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+  channel: stable
+
+project_type: package

packages/firebase_ui_storage/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 0.0.1
+
+* TODO: Describe initial release.

packages/firebase_ui_storage/LICENSE

@@ -0,0 +1 @@
+TODO: Add your license here.

packages/firebase_ui_storage/README.md

@@ -0,0 +1,118 @@
+## Firebase UI Storage
+
+[![pub package](https://img.shields.io/pub/v/firebase_ui_storage.svg)](https://pub.dev/packages/firebase_ui_storage)
+
+Firebase UI Storage is a set of Flutter widgets and utilities designed to help you build and integrate your user interface with Firebase Storage.
+
+## Installation
+
+Intall dependencies
+
+```sh
+flutter pub add firebase_core firebase_storage firebase_ui_storage
+```
+
+Donwload Firebase project config
+
+```sh
+flutterfire configure
+```
+
+## Configuration
+
+This section will walk you through the configuration process of the Firebase UI Storage
+
+### macOS
+
+If you're building for macOS, you will need to add an entitlement for either read-only access if you only upload files:
+
+```xml
+  <key>com.apple.security.files.user-selected.read-only</key>
+  <true/>
+```
+
+or read/write access if you want to be able to download files as well:
+
+```xml
+  <key>com.apple.security.files.user-selected.read-write</key>
+  <true/>
+```
+
+Make sure to add network client entitlement as well:
+
+```xml
+<key>com.apple.security.network.client</key>
+<true/>
+```
+
+### FirebaseUIStorage.configure()
+
+To reduce boilerplate for widgets, `FirebaseUIStroage` has a top-level configuration:
+
+```dart
+import 'package:firebase_core/firebase_core.dart';
+import 'package:firebase_storage/firebase_storage.dart';
+import 'package:firebase_ui_storage/firebase_ui_storage.dart';
+import 'package:flutter/material.dart';
+
+import 'firebase_options.dart';
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+
+  final storage = FirebaseStorage.instance;
+  final config = FirebaseUIStorageConfiguration(storage: storage);
+
+  await FirebaseUIStorage.configure(config);
+
+  runApp(const MyApp());
+}
+```
+
+See [API docs](https://pub.dev/documentation/firebase_ui_storage/latest/firebase_ui_storage/FirebaseUIStorageConfiguration-class.html) for more configuration options.
+
+### Overriding configuration
+
+It is possible to override a top-level configuration for a widget subtree:
+
+```dart
+class MyWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return FirebaseUIStorageConfigOverride(
+      config: FirebaseUIStorageConfiguration(
+        uploadRoot: storage.ref('${FirebaseAuth.instance.currentUser.uid}/'),
+        namingPolicy: const UuidFileUploadNamingPolicy(),
+        child: const MyUserPage(),
+      ),
+    );
+  }
+}
+```
+
+## Widgets
+
+### UploadButton
+
+```dart
+class MyUploadPage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: UploadButton(
+          mimeTypes: const ['image/png', 'image/jpeg'],
+          onError: (err, stackTrace) {
+            print(err.toString());
+          },
+          onUploadComplete: (ref) {
+            print('File uploaded to ${ref.path}');
+          }
+        ),
+      ),
+    );
+  }
+}
+```

packages/firebase_ui_storage/analysis_options.yaml

@@ -0,0 +1,4 @@
+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

packages/firebase_ui_storage/example/.gitignore

@@ -0,0 +1,44 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

packages/firebase_ui_storage/example/.metadata

@@ -0,0 +1,45 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled.
+
+version:
+  revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+  channel: stable
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: android
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: ios
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: linux
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: macos
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: web
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+    - platform: windows
+      create_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+      base_revision: 90c64ed42ba53a52d18f0cb3b17666c8662ed2a0
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

packages/firebase_ui_storage/example/README.md

@@ -0,0 +1,3 @@
+# firebase_ui_storage_example
+
+A new Flutter project.

packages/firebase_ui_storage/example/analysis_options.yaml

@@ -0,0 +1 @@
+include: package:flutter_lints/flutter.yaml

packages/firebase_ui_storage/example/android/.gitignore

@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks