Fix some warnings with Flutter 3.3 (#235)

Thanks for the contribution

.github/workflows/analyze-and-test.yaml

@@ -10,11 +10,11 @@ jobs:
     name: Flutter analyze
     strategy:
       matrix:
-        flutter: ['beta']
+        flutter: ['stable']
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2
         with:
           channel: ${{ matrix.flutter }}
       - run: flutter doctor
@@ -22,8 +22,8 @@ jobs:
       - run: flutter pub get
         working-directory: example
       - run: flutter analyze
-      - run: flutter test test # https://github.com/flutter/flutter/issues/20907
-      - run: flutter test test
+      - run: flutter test
+      - run: flutter test
         working-directory: example
       - run: flutter pub run tool/prepare_submit.dart
       - name: "check for uncommitted changes"
@@ -32,4 +32,17 @@ jobs:
           || (echo "##[error] found changed files after build. please run 'dart tool/prepare_submit.dart'" \
                    "and check in all changes" \
               && exit 1)
-        shell: bash
+        shell: bash
+  build_web_version:
+    name: Check that the web version compile
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+      - run: flutter precache web
+      - run: flutter pub get
+        working-directory: example
+      - run: flutter build web
+        working-directory: example

.github/workflows/publish-on-pub.yaml

@@ -8,17 +8,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2
         with:
-          channel: 'beta'
+          channel: 'stable'
       - run: flutter pub get
       - run: flutter pub run tool/publish/comment_dependency_overrides.dart
       - run: flutter pub get
       - run: flutter pub run tool/publish/check_version.dart ${GITHUB_REF}
       - name: Setup credentials
         run: |
-          mkdir -p $FLUTTER_HOME/.pub-cache
-          cat <<EOF > $FLUTTER_HOME/.pub-cache/credentials.json
+          cat <<EOF > $PUB_CACHE/credentials.json
           {
             "accessToken":"${{ secrets.OAUTH_ACCESS_TOKEN }}",
             "refreshToken":"${{ secrets.OAUTH_REFRESH_TOKEN }}",

.gitignore

@@ -3,6 +3,7 @@ _*
 
 !.gitignore
 !.github
+!.pubignore
 
 **/failures/*.png
 

.pubignore

@@ -0,0 +1,15 @@
+.dart_tool/
+.packages
+build/
+doc/api/
+*.iml
+_*
+.*
+**/failures/*.png
+test/golden/
+test/goldens/
+example/assets/
+example/android/
+example/ios/
+example/macos/
+example/web/

CHANGELOG.md

@@ -1,6 +1,110 @@
-## [0.8.0]
+## [1.4.3]
+- Fixed some lints with Flutter 3.3. 
+
+## [1.4.2]
+- Use `FilterQuality.low` as default to draw image layers.
+
+## [1.4.1]
+- Allow `AlignmentGeometry` for `alignment`.
+
+## [1.4.0]
+- Added `filterQuality` property to control the performance vs quality trade-off to use when drawing images
+
+## [1.3.0]
+- Added support for rounded corners on shapes and rects
+- Add support for text in dynamic properties (`ValueDelegate`)
+
+Example:
+
+```dart
+Lottie.asset(
+  'assets/DynamicText.json',
+  delegates: LottieDelegates(values: [
+    ValueDelegate.text(
+      ['Text layer'], // The path to the text element to change
+      value: 'The new text',
+    ),
+  ]),
+)
+```
+
+- Improve stroke with offset
+- Add support for reversed polystar paths
+- Enforce order of operations to avoid rounding errors
+
+## [1.2.2]
+- Internal maintenance: fix lints for Flutter 2.10
+
+## [1.2.1]
+- Fix: Revert Cubic to `PathInterpolator.cubic`
+
+## [1.2.0]
+- Add support for gaussian blurs.
+
+Example to blur some elements dynamically:
+  
+```dart
+Lottie.asset(
+  'assets/AndroidWave.json',
+  delegates: LottieDelegates(values: [
+    ValueDelegate.blurRadius(
+      ['**'], // The path to the element to blur
+      value: 20,
+    ),
+  ]),
+)
+```
+
+- Add support for drop shadows.
+
+Example to add a shadow dynamically:
+```dart
+Lottie.asset(
+  'assets/animation.json',
+  delegates: LottieDelegates(values: [
+    ValueDelegate.dropShadow(
+      ['**'], // The path to the elements with shadow
+      value: const DropShadow(
+        color: Colors.blue,
+        direction: 140,
+        distance: 60,
+        radius: 10,
+      ),
+    ),
+  ]),
+)
+```
+
+## [1.1.0]
+- Add `errorBuilder` callback to provide an alternative widget in case an error occurs during loading.
+```dart
+Lottie.network(
+  'https://example.does.not.exist/lottie.json',
+  errorBuilder: (context, exception, stackTrace) {
+    return const Text('😢');
+  },
+);
+```
+
+- Add `onWarning` to be notified when a warning occurs during the animation parsing or painting.
+  Previously the warnings where written in an internal `logger`.
+  ```dart
+  Lottie.asset('animation.json'
+    onWarning: (warning) {
+      _logger.info(warning);
+    },
+  );
+  ```
+- Various bug fixes
+
+## [1.0.1]
+- Implement `RenderBox.computeDryLayout`
+
+## [1.0.0]
 - Migrate to null safety
 - Fix some rendering bugs
+- Add an image delegate to dynamically change images
+- Allow to use an imageProviderFactory with a zip file
 
 ## [0.7.1]
 - Fix a crash for some lottie file with empty paths.

README.md

@@ -6,7 +6,7 @@
 Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](https://www.adobe.com/products/aftereffects.html) 
 animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-web) and renders them natively on mobile!
 
-This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
+This repository is an unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
 
 It works on Android, iOS, macOS, linux, windows and web.
 
@@ -20,9 +20,11 @@ The `Lottie` widget will load the json file and run the animation indefinitely.
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -56,11 +58,13 @@ With a custom `AnimationController` you have a rich API to play the animation in
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
@@ -132,8 +136,10 @@ This example shows how to load and parse a Lottie composition from a json file.
 
 ```dart
 class MyWidget extends StatefulWidget {
+  const MyWidget({Key? key}) : super(key: key);
+
   @override
-  _MyWidgetState createState() => _MyWidgetState();
+  State<MyWidget> createState() => _MyWidgetState();
 }
 
 class _MyWidgetState extends State<MyWidget> {
@@ -160,7 +166,7 @@ class _MyWidgetState extends State<MyWidget> {
         if (composition != null) {
           return Lottie(composition: composition);
         } else {
-          return Center(child: CircularProgressIndicator());
+          return const Center(child: CircularProgressIndicator());
         }
       },
     );
@@ -182,7 +188,7 @@ class CustomDrawer extends StatelessWidget {
   Widget build(BuildContext context) {
     return CustomPaint(
       painter: _Painter(composition),
-      size: Size(400, 400),
+      size: const Size(400, 400),
     );
   }
 }
@@ -236,7 +242,7 @@ class _Animation extends StatelessWidget {
           ),
           ValueDelegate.position(
             const ['Shape Layer 1', 'Rectangle', '**'],
-            relative: Offset(100, 200),
+            relative: const Offset(100, 200),
           ),
         ],
       ),
@@ -246,13 +252,12 @@ class _Animation extends StatelessWidget {
 ````
 
 ## Limitations
-Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
-are supported in this port.
+This port supports the same [feature set as Lottie Android](https://airbnb.io/lottie/#/supported-features).
 
 ## Flutter Web
-Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`
+Run the app with `flutter run -d chrome --web-renderer canvaskit`
 
-See a preview here: https://xvrh.github.io/lottie-flutter/index.html
+See a preview here: https://xvrh.github.io/lottie-flutter-web/
 
 ## More examples
 See the `example` folder for more code samples of the various possibilities.

README.template.md

@@ -6,7 +6,7 @@
 Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](https://www.adobe.com/products/aftereffects.html) 
 animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-web) and renders them natively on mobile!
 
-This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
+This repository is an unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
 
 It works on Android, iOS, macOS, linux, windows and web.
 
@@ -78,13 +78,12 @@ import 'example/lib/examples/simple_dynamic_properties.dart#example';
 ````
 
 ## Limitations
-Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
-are supported in this port.
+This port supports the same [feature set as Lottie Android](https://airbnb.io/lottie/#/supported-features).
 
 ## Flutter Web
-Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`
+Run the app with `flutter run -d chrome --web-renderer canvaskit`
 
-See a preview here: https://xvrh.github.io/lottie-flutter/index.html
+See a preview here: https://xvrh.github.io/lottie-flutter-web/
 
 ## More examples
 See the `example` folder for more code samples of the various possibilities.

analysis_options.yaml

@@ -1,39 +1,29 @@
-include: package:pedantic/analysis_options.yaml
+include: package:flutter_lints/flutter.yaml
 analyzer:
-  errors:
   strong-mode:
     implicit-casts: false
     implicit-dynamic: false
 linter:
   rules:
-    avoid_renaming_method_parameters: true
-    avoid_returning_null_for_future: true
-    avoid_returning_null_for_void: true
-    avoid_returning_this: true
+    avoid_print: false
+
+    always_declare_return_types: true
+    avoid_dynamic_calls: true
+    avoid_escaping_inner_quotes: true
     avoid_setters_without_getters: true
-    await_only_futures: true
-    camel_case_types: true
-    cancel_subscriptions: true
+    cast_nullable_to_non_nullable: true
     close_sinks: true
-    constant_identifier_names: true
-    empty_statements: true
-    hash_and_equals: true
-    iterable_contains_unrelated_type: true
-    list_remove_unrelated_type: true
     no_adjacent_strings_in_list: true
-    non_constant_identifier_names: true
+    no_default_cases: true
+    omit_local_variable_types: true
     only_throw_errors: true
-    overridden_fields: true
-    prefer_inlined_adds: true
     prefer_interpolation_to_compose_strings: true
-    prefer_null_aware_operators: true
-    prefer_relative_imports: true
-    prefer_typing_uninitialized_variables: true
+    prefer_single_quotes: true
+    sort_child_properties_last: true
     sort_pub_dependencies: true
     test_types_in_equals: true
-    unnecessary_brace_in_string_interps: true
-    unnecessary_getters_setters: true
+    unawaited_futures: true
     unnecessary_parenthesis: true
     unnecessary_statements: true
-    use_function_type_syntax_for_parameters: true
-    void_checks: true
+    unsafe_html: true
+    use_raw_strings: true

example/README.md

@@ -6,9 +6,11 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(

example/android/.gitignore

@@ -5,3 +5,9 @@ gradle-wrapper.jar
 /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

example/android/app/build.gradle

@@ -8,7 +8,7 @@ if (localPropertiesFile.exists()) {
 
 def flutterRoot = localProperties.getProperty('flutter.sdk')
 if (flutterRoot == null) {
-    throw new Exception("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
 }
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
@@ -26,23 +26,28 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion flutter.compileSdkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
 
-    lintOptions {
-        disable 'InvalidPackage'
-    }
-
     defaultConfig {
-        applicationId "com.github.xvrh.lottie.sample"
-        minSdkVersion 16
-        targetSdkVersion 28
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.github.xvrh.lottie.example"
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -60,7 +65,4 @@ flutter {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test:runner:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
 }

example/android/app/src/debug/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.github.xvrh.lottie.sample">
+    package="com.github.xvrh.lottie.example">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->

example/android/app/src/main/AndroidManifest.xml

@@ -1,21 +1,25 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.github.xvrh.lottie.sample">
-    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
-         calls FlutterMain.startInitialization(this); in its onCreate method.
-         In most cases you can leave this as-is, but you if you want to provide
-         additional functionality it is fine to subclass or reimplement
-         FlutterApplication and put your custom class here. -->
-    <application
-        android:name="io.flutter.app.FlutterApplication"
+    package="com.github.xvrh.lottie.example">
+   <application
         android:label="example"
+        android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name=".MainActivity"
+            android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

example/android/app/src/main/kotlin/com/github/xvrh/lottie/example/MainActivity.kt

@@ -0,0 +1,6 @@
+package com.github.xvrh.lottie.example
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

example/android/app/src/main/kotlin/com/github/xvrh/lottie/sample/MainActivity.kt

@@ -1,12 +0,0 @@
-package com.github.xvrh.lottie.sample
-
-import androidx.annotation.NonNull;
-import io.flutter.embedding.android.FlutterActivity
-import io.flutter.embedding.engine.FlutterEngine
-import io.flutter.plugins.GeneratedPluginRegistrant
-
-class MainActivity: FlutterActivity() {
-    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
-        GeneratedPluginRegistrant.registerWith(flutterEngine);
-    }
-}

example/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/main/res/values/styles.xml

@@ -1,8 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
         <!-- Show a splash screen on the activity. Automatically removed when
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
     </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
 </resources>

example/android/app/src/profile/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.github.xvrh.lottie.sample">
+    package="com.github.xvrh.lottie.example">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->

example/android/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.6.10'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 

example/android/gradle.properties

@@ -1,4 +1,3 @@
 org.gradle.jvmargs=-Xmx1536M
-android.enableR8=true
 android.useAndroidX=true
 android.enableJetifier=true

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

example/android/settings.gradle

@@ -1,15 +1,11 @@
 include ':app'
 
-def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
 
-def plugins = new Properties()
-def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
-if (pluginsFile.exists()) {
-    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
-}
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
 
-plugins.each { name, path ->
-    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
-    include ":$name"
-    project(":$name").projectDir = pluginDirectory
-}
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"

example/assets/Tests/AnimatedShadow.json

@@ -0,0 +1 @@
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example/assets/Tests/GradientFillBlur.json

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example/assets/Tests/GradientOpacityInterpolation.json

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example/assets/Tests/GradientStrokeBlur.json

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example/assets/Tests/Rect1.json

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example/assets/Tests/Rect3.json

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example/assets/Tests/Rect4.json

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example/assets/Tests/Rect5.json

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example/assets/Tests/Rect6.json

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example/assets/Tests/Rect7.json

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example/assets/Tests/Rect9.json

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example/assets/Tests/ReversedStar.json

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example/assets/Tests/RoundedCorners.json

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example/assets/Tests/StaticShadow.json

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example/assets/Tests/StrokeBlur.json

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example/assets/Tests/rect2.json

@@ -0,0 +1 @@
+{"assets":[],"layers":[{"ddd":0,"ind":0,"ty":4,"nm":"Shape Layer 1","parent":1,"ks":{"o":{"k":100},"r":{"k":0},"p":{"k":[100,100,0]},"a":{"k":[0,0,0]},"s":{"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","it":[{"ty":"rc","d":1,"s":{"k":[{"i":{"x":[0.667,0.667],"y":[1,1]},"o":{"x":[0.333,0.333],"y":[0,0]},"n":["0p667_1_0p333_0","0p667_1_0p333_0"],"t":0,"s":[85.714,85.714],"e":[52.714,52.714]},{"i":{"x":[0.667,0.667],"y":[1,1]},"o":{"x":[0.333,0.333],"y":[0,0]},"n":["0p667_1_0p333_0","0p667_1_0p333_0"],"t":16,"s":[52.714,52.714],"e":[85.714,85.714]},{"t":35}]},"p":{"k":[0,0]},"r":{"k":0},"nm":"Rectangle Path 1","mn":"ADBE Vector Shape - Rect"},{"ty":"st","c":{"k":[0,0,0,1]},"o":{"k":100},"w":{"k":14},"lc":1,"lj":1,"ml":4,"nm":"Stroke 1","mn":"ADBE Vector Graphic - Stroke"},{"ty":"tr","p":{"k":[2.198,1.099],"ix":2},"a":{"k":[0,0],"ix":1},"s":{"k":[100,100],"ix":3},"r":{"k":0,"ix":6},"o":{"k":100,"ix":7},"sk":{"k":0,"ix":4},"sa":{"k":0,"ix":5},"nm":"Transform"}],"nm":"Rectangle 1","np":2,"mn":"ADBE Vector Group"}],"ip":0,"op":36,"st":0,"bm":0,"sr":1},{"ddd":0,"ind":1,"ty":1,"nm":"White Solid 1","ks":{"o":{"k":100},"r":{"k":0},"p":{"k":[45,45,0]},"a":{"k":[100,100,0]},"s":{"k":[45,45,100]}},"ao":0,"sw":200,"sh":200,"sc":"#ffffff","ip":0,"op":36,"st":0,"bm":0,"sr":1}],"v":"4.5.4","ddd":0,"ip":0,"op":36,"fr":60,"w":90,"h":90}

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/lib/examples/alert_dialog.dart

@@ -2,9 +2,11 @@ import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(App());
+void main() => runApp(const App());
 
 class App extends StatelessWidget {
+  const App({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -23,7 +25,7 @@ class __PageState extends State<_Page> {
   void initState() {
     super.initState();
 
-    SchedulerBinding.instance!.addPostFrameCallback((_) => _showLoader());
+    SchedulerBinding.instance.addPostFrameCallback((_) => _showLoader());
   }
 
   void _showLoader() {
@@ -42,6 +44,6 @@ class __PageState extends State<_Page> {
 
   @override
   Widget build(BuildContext context) {
-    return Center();
+    return const Center();
   }
 }

example/lib/examples/animate_no_repeat.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatelessWidget {

example/lib/examples/animation_controller.dart

@@ -1,11 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> with TickerProviderStateMixin {

example/lib/examples/animation_full_control.dart

@@ -9,11 +9,13 @@ import 'package:lottie/lottie.dart';
 /// This works by creating an AnimationController instance and passing it
 /// to the Lottie widget.
 /// The AnimationController class has a rich API to run the animation in various ways.
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
@@ -43,7 +45,7 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
-          title: Text('Animation control'),
+          title: const Text('Animation control'),
         ),
         body: Column(
           children: <Widget>[
@@ -58,27 +60,27 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
                 });
               },
             ),
-            Text('${_controller.value.toStringAsFixed(2)}'),
+            Text(_controller.value.toStringAsFixed(2)),
             Row(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
                 // Play backward
                 IconButton(
-                  icon: Icon(Icons.arrow_left),
+                  icon: const Icon(Icons.arrow_left),
                   onPressed: () {
                     _controller.reverse();
                   },
                 ),
                 // Pause
                 IconButton(
-                  icon: Icon(Icons.pause),
+                  icon: const Icon(Icons.pause),
                   onPressed: () {
                     _controller.stop();
                   },
                 ),
                 // Play forward
                 IconButton(
-                  icon: Icon(Icons.arrow_right),
+                  icon: const Icon(Icons.arrow_right),
                   onPressed: () {
                     _controller.forward();
                   },
@@ -87,7 +89,6 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
             ),
             const SizedBox(height: 30),
             ElevatedButton(
-              child: Text('Loop between frames'),
               onPressed: () {
                 // Loop between 2 specifics frames
 
@@ -100,6 +101,7 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
                   period: _controller.duration! * (stop - start),
                 );
               },
+              child: const Text('Loop between frames'),
             ),
           ],
         ),

example/lib/examples/blur.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(const MyApp());
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [
+            Lottie.asset(
+              'assets/AndroidWave.json',
+              height: 300,
+              delegates: LottieDelegates(values: [
+                ValueDelegate.blurRadius(
+                  ['**'],
+                  value: 20,
+                ),
+              ]),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/custom_draw.dart

@@ -1,14 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
+    return const MaterialApp(
       home: Scaffold(
         body: MyWidget(),
       ),
@@ -17,8 +18,10 @@ class MyApp extends StatelessWidget {
 }
 
 class MyWidget extends StatefulWidget {
+  const MyWidget({Key? key}) : super(key: key);
+
   @override
-  _MyWidgetState createState() => _MyWidgetState();
+  State<MyWidget> createState() => _MyWidgetState();
 }
 
 class _MyWidgetState extends State<MyWidget> {
@@ -46,7 +49,7 @@ class _MyWidgetState extends State<MyWidget> {
         if (composition != null) {
           return CustomDrawer(composition);
         } else {
-          return Center(child: CircularProgressIndicator());
+          return const Center(child: CircularProgressIndicator());
         }
       },
     );
@@ -63,7 +66,7 @@ class CustomDrawer extends StatelessWidget {
   Widget build(BuildContext context) {
     return CustomPaint(
       painter: _Painter(composition),
-      size: Size(400, 400),
+      size: const Size(400, 400),
     );
   }
 }

example/lib/examples/custom_load.dart

@@ -1,14 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
+    return const MaterialApp(
       home: Scaffold(
         body: MyWidget(),
       ),
@@ -18,8 +19,10 @@ class MyApp extends StatelessWidget {
 
 //--- example
 class MyWidget extends StatefulWidget {
+  const MyWidget({Key? key}) : super(key: key);
+
   @override
-  _MyWidgetState createState() => _MyWidgetState();
+  State<MyWidget> createState() => _MyWidgetState();
 }
 
 class _MyWidgetState extends State<MyWidget> {
@@ -46,7 +49,7 @@ class _MyWidgetState extends State<MyWidget> {
         if (composition != null) {
           return Lottie(composition: composition);
         } else {
-          return Center(child: CircularProgressIndicator());
+          return const Center(child: CircularProgressIndicator());
         }
       },
     );

example/lib/examples/drop_shadow.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(const MyApp());
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [
+            Lottie.asset(
+              'assets/Tests/Fill.json',
+              height: 300,
+              delegates: LottieDelegates(values: [
+                ValueDelegate.dropShadow(
+                  ['**'],
+                  value: const DropShadow(
+                    color: Colors.blue,
+                    direction: 140,
+                    distance: 60,
+                    radius: 10,
+                  ),
+                ),
+              ]),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/dynamic_properties.dart

@@ -1,17 +1,16 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_colorpicker/flutter_colorpicker.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
   @override
-  _AppState createState() => _AppState();
+  State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> with TickerProviderStateMixin {
@@ -33,7 +32,7 @@ class _AppState extends State<App> with TickerProviderStateMixin {
       home: Scaffold(
         backgroundColor: Colors.white,
         appBar: AppBar(
-          title: Text('Dynamic properties'),
+          title: const Text('Dynamic properties'),
         ),
         body: ListView(
           children: <Widget>[
@@ -63,7 +62,7 @@ class _AppState extends State<App> with TickerProviderStateMixin {
               },
             ),
             Center(
-              child: Container(
+              child: SizedBox(
                 width: 500,
                 child: ColorPicker(
                   pickerColor: _color,
@@ -72,7 +71,7 @@ class _AppState extends State<App> with TickerProviderStateMixin {
                       _color = newColor;
                     });
                   },
-                  showLabel: false,
+                  labelTypes: const [],
                   enableAlpha: false,
                   pickerAreaHeightPercent: 0.8,
                 ),

example/lib/examples/dynamic_text.dart

@@ -3,14 +3,14 @@ import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
   @override
-  _AppState createState() => _AppState();
+  State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> with TickerProviderStateMixin {
@@ -36,7 +36,7 @@ class _AppState extends State<App> with TickerProviderStateMixin {
       home: Scaffold(
         backgroundColor: Colors.white,
         appBar: AppBar(
-          title: Text('Dynamic text'),
+          title: const Text('Dynamic text'),
         ),
         body: Center(
           child: Column(
@@ -54,7 +54,7 @@ class _AppState extends State<App> with TickerProviderStateMixin {
                   ),
                 ),
               ),
-              Container(
+              SizedBox(
                 width: 300,
                 child: CupertinoTextField(
                   controller: _textController,

example/lib/examples/error_builder.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(const MyApp());
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [_Animation()],
+        ),
+      ),
+    );
+  }
+}
+
+class _Animation extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Lottie.network(
+      'https://example.does.not.exist/lottie.json',
+      errorBuilder: (context, exception, stackTrace) {
+        return const Text('😢');
+      },
+    );
+  }
+}

example/lib/examples/examples.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(

example/lib/examples/hide_after_complete.dart

@@ -2,14 +2,14 @@ import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
   @override
-  _AppState createState() => _AppState();
+  State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> with TickerProviderStateMixin {

example/lib/examples/markers.dart

@@ -5,14 +5,14 @@ import 'package:lottie/lottie.dart';
 /// It is based on this article for lottie-ios:
 /// https://medium.com/swlh/controlling-lottie-animation-with-markers-5e9035d94623
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
   @override
-  _AppState createState() => _AppState();
+  State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> with TickerProviderStateMixin {
@@ -30,13 +30,13 @@ class _AppState extends State<App> with TickerProviderStateMixin {
       theme: ThemeData.dark(),
       home: Scaffold(
         appBar: AppBar(
-          title: Text('Markers'),
+          title: const Text('Markers'),
         ),
         body: FutureBuilder<LottieComposition>(
           future: _composition,
           builder: (context, snapshot) {
             if (snapshot.hasError) return ErrorWidget(snapshot.error!);
-            if (!snapshot.hasData) return CircularProgressIndicator();
+            if (!snapshot.hasData) return const CircularProgressIndicator();
             return _LottieDetails(snapshot.data!);
           },
         ),
@@ -80,24 +80,24 @@ class _LottieDetailsState extends State<_LottieDetails>
           height: 150,
         ),
         ListTile(
-          title: Text('Composition start frame'),
+          title: const Text('Composition start frame'),
           trailing: Text(widget.composition.startFrame.toStringAsFixed(1)),
         ),
         ListTile(
-          title: Text('Composition duration'),
+          title: const Text('Composition duration'),
           trailing: Text(widget.composition.durationFrames.toStringAsFixed(1)),
         ),
         ElevatedButton(
-          child: Text('touchDownEnd - touchUpCancel'),
           onPressed: () => _playBetween('touchDownEnd', 'touchUpCancel'),
+          child: const Text('touchDownEnd - touchUpCancel'),
         ),
         ElevatedButton(
-          child: Text('touchDownStart - touchDownEnd'),
           onPressed: () => _playBetween('touchDownStart', 'touchDownEnd'),
+          child: const Text('touchDownStart - touchDownEnd'),
         ),
         ElevatedButton(
-          child: Text('touchDownEnd - touchUpEnd'),
           onPressed: () => _playBetween('touchDownEnd', 'touchUpEnd'),
+          child: const Text('touchDownEnd - touchUpEnd'),
         ),
         for (var marker in widget.composition.markers)
           ListTile(

example/lib/examples/repeat.dart

@@ -1,11 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> with TickerProviderStateMixin {

example/lib/examples/run_once.dart

@@ -8,14 +8,14 @@ void main() async {
     ..level = Level.ALL
     ..onRecord.listen(print);
 
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatefulWidget {
   const App({Key? key}) : super(key: key);
 
   @override
-  _AppState createState() => _AppState();
+  State<App> createState() => _AppState();
 }
 
 class _AppState extends State<App> with TickerProviderStateMixin {

example/lib/examples/save_frames.dart

@@ -1,5 +1,3 @@
-//@dart=2.10
-
 import 'dart:io';
 import 'dart:ui';
 import 'package:flutter/material.dart';
@@ -9,15 +7,17 @@ import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 
 /// This example shows how to save the frame of an animation to files on disk.
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
-  _MyAppState createState() => _MyAppState();
+  State<MyApp> createState() => _MyAppState();
 }
 
 class _MyAppState extends State<MyApp> {
-  List<File> _frames;
+  List<File>? _frames;
 
   @override
   Widget build(BuildContext context) {
@@ -29,14 +29,14 @@ class _MyAppState extends State<MyApp> {
             crossAxisAlignment: CrossAxisAlignment.stretch,
             children: [
               ElevatedButton(
-                child: Text('Export all frames'),
                 onPressed: _export,
+                child: const Text('Export all frames'),
               ),
               if (_frames != null)
                 Expanded(
                   child: GridView.count(
                     crossAxisCount: 10,
-                    children: [..._frames.map((f) => Image.file(f))],
+                    children: [..._frames!.map((f) => Image.file(f))],
                   ),
                 )
             ],
@@ -53,7 +53,7 @@ class _MyAppState extends State<MyApp> {
     var frames = await exportFrames(
         composition, await _createTempDirectory('export-lottie'),
         progresses: [for (var i = 0.0; i <= 1; i += 0.1) i],
-        size: Size(50, 50));
+        size: const Size(50, 50));
 
     setState(() {
       _frames = frames;
@@ -62,7 +62,7 @@ class _MyAppState extends State<MyApp> {
 }
 
 Future<List<File>> exportFrames(LottieComposition composition, String directory,
-    {@required Size size, @required List<double> progresses}) async {
+    {required Size size, required List<double> progresses}) async {
   var drawable = LottieDrawable(composition);
 
   var frames = <File>[];
@@ -89,7 +89,7 @@ Future<ByteData> _toByteData(LottieDrawable drawable, Size size) async {
 
   var picture = pictureRecorder.endRecording();
   var image = await picture.toImage(size.width.toInt(), size.height.toInt());
-  return await image.toByteData(format: ImageByteFormat.png);
+  return (await image.toByteData(format: ImageByteFormat.png))!;
 }
 
 Future<String> _createTempDirectory(String folderName) async {

example/lib/examples/simple_dynamic_properties.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -35,7 +37,7 @@ class _Animation extends StatelessWidget {
           ),
           ValueDelegate.position(
             const ['Shape Layer 1', 'Rectangle', '**'],
-            relative: Offset(100, 200),
+            relative: const Offset(100, 200),
           ),
         ],
       ),

example/lib/main.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(

example/lib/main_app.dart

@@ -1,53 +1,57 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:logging/logging.dart';
 import 'package:lottie/lottie.dart';
 import 'src/all_files.g.dart';
 
+final _logger = Logger('main_app');
+
 void main() {
   Logger.root
     ..level = Level.ALL
     ..onRecord.listen(print);
   Lottie.traceEnabled = true;
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatelessWidget {
+  const App({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       //showPerformanceOverlay: true,
       home: Scaffold(
         appBar: AppBar(
-          title: Text('Lottie Flutter'),
+          title: const Text('Lottie Flutter'),
         ),
         body: Scrollbar(
           child: GridView.builder(
             itemCount: files.length,
-            gridDelegate:
-                SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 4),
+            gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+                crossAxisCount: 4),
             itemBuilder: (context, index) {
               var assetName = files[index];
               return GestureDetector(
-                child: _Item(
-                  child: Lottie.asset(
-                    assetName,
-                    frameBuilder: (context, child, composition) {
-                      return AnimatedOpacity(
-                        child: child,
-                        opacity: composition == null ? 0 : 1,
-                        duration: const Duration(seconds: 1),
-                        curve: Curves.easeOut,
-                      );
-                    },
-                  ),
-                ),
                 onTap: () {
                   Navigator.push(
                       context,
                       MaterialPageRoute<void>(
                           builder: (context) => Detail(assetName)));
                 },
+                child: _Item(
+                  child: Lottie.asset(
+                    assetName,
+                    onWarning: (w) => _logger.info('$assetName - $w'),
+                    frameBuilder: (context, child, composition) {
+                      return AnimatedOpacity(
+                        opacity: composition == null ? 0 : 1,
+                        duration: const Duration(seconds: 1),
+                        curve: Curves.easeOut,
+                        child: child,
+                      );
+                    },
+                  ),
+                ),
               );
             },
           ),
@@ -69,11 +73,11 @@ class _Item extends StatelessWidget {
       child: Container(
         decoration: BoxDecoration(
             color: Colors.white,
-            borderRadius: BorderRadius.all(Radius.circular(10)),
+            borderRadius: const BorderRadius.all(Radius.circular(10)),
             boxShadow: [
               BoxShadow(
                   color: Colors.black.withOpacity(0.1),
-                  offset: Offset(2, 2),
+                  offset: const Offset(2, 2),
                   blurRadius: 5)
             ]),
         child: child,
@@ -88,7 +92,7 @@ class Detail extends StatefulWidget {
   const Detail(this.assetName, {Key? key}) : super(key: key);
 
   @override
-  _DetailState createState() => _DetailState();
+  State<Detail> createState() => _DetailState();
 }
 
 class _DetailState extends State<Detail> with TickerProviderStateMixin {
@@ -104,7 +108,7 @@ class _DetailState extends State<Detail> with TickerProviderStateMixin {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('${widget.assetName}'),
+        title: Text(widget.assetName),
       ),
       body: SingleChildScrollView(
         child: Column(

example/lib/sizing_example.dart

@@ -20,7 +20,7 @@ class App extends StatelessWidget {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
-          title: Text(''),
+          title: const Text(''),
         ),
         body: SingleChildScrollView(
           child: Center(

example/lib/src/all_files.g.dart

@@ -108,14 +108,17 @@ final files = [
   'assets/Tests/hd.json',
   'assets/Tests/map.zip',
   'assets/TwitterHeartButton.json',
-  'assets/_loading_indicator.json',
+  'assets/battery_optimizations.json',
   'assets/bluetoothscanning.json',
+  'assets/camera_change.json',
+  'assets/envelope.json',
   'assets/example_with_images/data.json',
   'assets/lf20_w2Afea.json',
   'assets/lottiefiles/100_percent.json',
+  'assets/lottiefiles/28861-connection-style-2.json',
+  'assets/lottiefiles/45668-arrow-with-light-passing-through.json',
   'assets/lottiefiles/Plane.json',
   'assets/lottiefiles/StreetByMorning.json',
-  'assets/lottiefiles/___.json',
   'assets/lottiefiles/a_mountain.json',
   'assets/lottiefiles/accept_arrows.json',
   'assets/lottiefiles/airbnb.json',
@@ -346,7 +349,9 @@ final files = [
   'assets/lottiefiles/yoga_carpet.json',
   'assets/lottiefiles/youtube_icon_reveal.json',
   'assets/playing.json',
-  'assets/weather/_hurricane.json',
+  'assets/spinning_carrousel.zip',
+  'assets/sticker.json',
+  'assets/tent.json',
   'assets/weather/fog.json',
   'assets/weather/hurricane.json',
   'assets/weather/thunder-storm.json',

example/lib/tests/airbnb.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatelessWidget {
@@ -13,7 +13,7 @@ class App extends StatelessWidget {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
-          title: Text(''),
+          title: const Text(''),
         ),
         body: SingleChildScrollView(
           child: Center(

example/lib/tests/we_accept.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:lottie/lottie.dart';
 
 void main() async {
-  runApp(App());
+  runApp(const App());
 }
 
 class App extends StatelessWidget {
@@ -13,11 +13,12 @@ class App extends StatelessWidget {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
-          title: Text(''),
+          title: const Text(''),
         ),
         body: GridView(
-          gridDelegate:
-              SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 4),
+          gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+            crossAxisCount: 4,
+          ),
           children: [
             Lottie.asset(
               'assets/Tests/WeAccept.json',

example/macos/Podfile

@@ -9,74 +9,32 @@ project 'Runner', {
   'Release' => :release,
 }
 
-def parse_KV_file(file, separator='=')
-  file_abs_path = File.expand_path(file)
-  if !File.exists? file_abs_path
-    return [];
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
   end
-  pods_ary = []
-  skip_line_start_symbols = ["#", "/"]
-  File.foreach(file_abs_path) { |line|
-      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
-      plugin = line.split(pattern=separator)
-      if plugin.length == 2
-        podname = plugin[0].strip()
-        path = plugin[1].strip()
-        podpath = File.expand_path("#{path}", file_abs_path)
-        pods_ary.push({:name => podname, :path => podpath});
-      else
-        puts "Invalid plugin specification: #{line}"
-      end
-  }
-  return pods_ary
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
 end
 
-def pubspec_supports_macos(file)
-  file_abs_path = File.expand_path(file)
-  if !File.exists? file_abs_path
-    return false;
-  end
-  File.foreach(file_abs_path) { |line|
-    return true if line =~ /^\s*macos:/
-  }
-  return false
-end
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_macos_podfile_setup
 
 target 'Runner' do
   use_frameworks!
   use_modular_headers!
 
-  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
-  # referring to absolute paths on developers' machines.
-  ephemeral_dir = File.join('Flutter', 'ephemeral')
-  symlink_dir = File.join(ephemeral_dir, '.symlinks')
-  symlink_plugins_dir = File.join(symlink_dir, 'plugins')
-  system("rm -rf #{symlink_dir}")
-  system("mkdir -p #{symlink_plugins_dir}")
-
-  # Flutter Pods
-  generated_xcconfig = parse_KV_file(File.join(ephemeral_dir, 'Flutter-Generated.xcconfig'))
-  if generated_xcconfig.empty?
-    puts "Flutter-Generated.xcconfig must exist. If you're running pod install manually, make sure flutter packages get is executed first."
-  end
-  generated_xcconfig.map { |p|
-    if p[:name] == 'FLUTTER_FRAMEWORK_DIR'
-      symlink = File.join(symlink_dir, 'flutter')
-      File.symlink(File.dirname(p[:path]), symlink)
-      pod 'FlutterMacOS', :path => File.join(symlink, File.basename(p[:path]))
-    end
-  }
-
-  # Plugin Pods
-  plugin_pods = parse_KV_file('../.flutter-plugins')
-  plugin_pods.map { |p|
-    symlink = File.join(symlink_plugins_dir, p[:name])
-    File.symlink(p[:path], symlink)
-    if pubspec_supports_macos(File.join(symlink, 'pubspec.yaml'))
-      pod p[:name], :path => File.join(symlink, 'macos')
-    end
-  }
+  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
 end
 
-# Prevent Cocoapods from embedding a second Flutter framework and causing an error with the new Xcode build system.
-install! 'cocoapods', :disable_input_output_paths => true
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_macos_build_settings(target)
+  end
+end

example/macos/Podfile.lock

@@ -1,28 +1,22 @@
 PODS:
-  - FlutterMacOS (1.22.4)
-  - path_provider (0.0.1)
+  - FlutterMacOS (1.0.0)
   - path_provider_macos (0.0.1):
     - FlutterMacOS
 
 DEPENDENCIES:
-  - path_provider (from `Flutter/ephemeral/.symlinks/plugins/path_provider/macos`)
+  - FlutterMacOS (from `Flutter/ephemeral`)
   - path_provider_macos (from `Flutter/ephemeral/.symlinks/plugins/path_provider_macos/macos`)
 
-SPEC REPOS:
-  trunk:
-    - FlutterMacOS
-
 EXTERNAL SOURCES:
-  path_provider:
-    :path: Flutter/ephemeral/.symlinks/plugins/path_provider/macos
+  FlutterMacOS:
+    :path: Flutter/ephemeral
   path_provider_macos:
     :path: Flutter/ephemeral/.symlinks/plugins/path_provider_macos/macos
 
 SPEC CHECKSUMS:
-  FlutterMacOS: ac210ef71944b3f04789076d70d4c72c7ec0c619
-  path_provider: e0848572d1d38b9a7dd099e79cf83f5b7e2cde9f
-  path_provider_macos: a0a3fd666cb7cd0448e936fb4abad4052961002b
+  FlutterMacOS: 57701585bf7de1b3fc2bb61f6378d73bbdea8424
+  path_provider_macos: 160cab0d5461f0c0e02995469a98f24bdb9a3f1f
 
-PODFILE CHECKSUM: d8ba9b3e9e93c62c74a660b46c6fcb09f03991a7
+PODFILE CHECKSUM: 6eac6b3292e5142cfc23bdeb71848a40ec51c14c
 
-COCOAPODS: 1.10.1
+COCOAPODS: 1.11.3

example/macos/Runner.xcodeproj/project.pbxproj

@@ -319,9 +319,12 @@
 			files = (
 			);
 			inputPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/path_provider_macos/path_provider_macos.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/path_provider_macos.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;

example/pubspec.lock

@@ -7,77 +7,70 @@ packages:
       name: archive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.0-nullsafety.0"
+    version: "3.3.1"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0-nullsafety.3"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.5"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.2.1"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0-nullsafety.5"
+    version: "1.16.0"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.0-nullsafety.0"
+    version: "3.0.2"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.3.1"
   ffi:
     dependency: transitive
     description:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "2.0.1"
   file:
     dependency: transitive
     description:
       name: file
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.2.1"
+    version: "6.1.4"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -89,7 +82,14 @@ packages:
       name: flutter_colorpicker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.0-nullsafety.0"
+    version: "1.0.3"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -101,126 +101,140 @@ packages:
       name: golden_toolkit
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.0-nullsafety.0"
+    version: "0.13.0"
   http:
     dependency: "direct main"
     description:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.5"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.4"
-  intl:
+    version: "4.0.1"
+  lints:
     dependency: transitive
     description:
-      name: intl
+      name: lints
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.16.1"
+    version: "2.0.0"
   logging:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: logging
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.0.2"
   lottie:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "0.8.0-nullsafety.2"
+    version: "1.4.3"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10-nullsafety.3"
+    version: "0.12.12"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.5"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.6"
+    version: "1.8.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.3"
+    version: "1.8.2"
   path_provider:
     dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.27"
+    version: "2.0.11"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.20"
+  path_provider_ios:
+    dependency: transitive
+    description:
+      name: path_provider_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.11"
   path_provider_linux:
     dependency: transitive
     description:
       name: path_provider_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+2"
+    version: "2.1.7"
   path_provider_macos:
     dependency: transitive
     description:
       name: path_provider_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+8"
+    version: "2.0.6"
   path_provider_platform_interface:
     dependency: transitive
     description:
       name: path_provider_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.4"
   path_provider_windows:
     dependency: transitive
     description:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+3"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.9.2"
+    version: "2.1.3"
   platform:
     dependency: transitive
     description:
       name: platform
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.1"
+    version: "3.1.0"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.1.2"
   process:
     dependency: transitive
     description:
       name: process
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.13"
+    version: "4.2.4"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -232,70 +246,70 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.4"
+    version: "1.9.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.10.0-nullsafety.6"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19-nullsafety.6"
+    version: "0.4.12"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.5"
+    version: "1.3.1"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.5"
+    version: "2.1.2"
   win32:
     dependency: transitive
     description:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.4"
+    version: "3.0.0"
   xdg_directories:
     dependency: transitive
     description:
       name: xdg_directories
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0+2"
 sdks:
-  dart: ">=2.12.0-29.10.beta <3.0.0"
-  flutter: ">=1.24.0-10.2.pre"
+  dart: ">=2.18.0 <3.0.0"
+  flutter: ">=3.3.0"

example/pubspec.yaml

@@ -8,16 +8,19 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  flutter_colorpicker: ^0.4.0-nullsafety.0
+  flutter_colorpicker:
   http:
+  logging:
   lottie:
     path: ../
+  path:
   path_provider:
 
 dev_dependencies:
+  flutter_lints:
   flutter_test:
     sdk: flutter
-  golden_toolkit: ^0.9.0-nullsafety.0
+  golden_toolkit:
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec
@@ -60,4 +63,4 @@ flutter:
         - asset: assets/fonts/Roboto.ttf
     - family: Noto Emoji
       fonts:
-        - asset: assets/fonts/NotoEmoji-Regular.ttf
+        - asset: assets/fonts/Noto-Emoji.ttf

example/test/dynamic_text_test.dart

@@ -1,29 +0,0 @@
-import 'dart:io';
-import 'dart:ui';
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-import 'package:lottie/lottie.dart';
-
-void main() {
-  testWidgets('Dynamic test', (tester) async {
-    var composition = await LottieComposition.fromBytes(
-        File('assets/Tests/DynamicText.json').readAsBytesSync());
-
-    await tester.pumpWidget(
-      MaterialApp(
-        home: Lottie(
-          composition: composition,
-          animate: false,
-          delegates: LottieDelegates(
-              text: (input) => '🔥c️🔥👮🏿‍🔥',
-              textStyle: (font) => TextStyle(
-                  fontFamily: 'Roboto', fontFamilyFallback: ['Noto Emoji']),
-              values: []),
-        ),
-      ),
-    );
-
-    await expectLater(
-        find.byType(Lottie), matchesGoldenFile('goldens/dynamic_text.png'));
-  });
-}

example/test/flutter_test_config.dart

@@ -1,7 +0,0 @@
-import 'dart:async';
-import 'package:golden_toolkit/golden_toolkit.dart';
-
-Future<void> testExecutable(FutureOr<void> Function() testMain) async {
-  await loadAppFonts();
-  return testMain();
-}