Dash path effect (#27)

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

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         flutter: ['stable', 'dev']
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
       - uses: subosito/flutter-action@v1
@@ -19,12 +19,16 @@ jobs:
           channel: ${{ matrix.flutter }}
       - run: flutter doctor
       - run: flutter --version
+      - 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
+        working-directory: example
       - run: flutter pub run tool/prepare_submit.dart
       - name: "check for uncommitted changes"
         run: |
-          git diff --exit-code --stat -- . \
+          git diff --exit-code --stat -- . ':(exclude)*pubspec.lock' \
           || (echo "##[error] found changed files after build. please run 'dart tool/prepare_submit.dart'" \
                    "and check in all changes" \
               && exit 1)

.gitignore

@@ -4,6 +4,8 @@ _*
 !.gitignore
 !.github
 
+**/failures/*.png
+
 *.iml
 **/doc/api/
 build/

CHANGELOG.md

@@ -1,3 +1,23 @@
+## [0.3.1] - 2020-03-05
+- Support dashed path
+
+## [0.3.0+1] - 2020-03-05
+- Specify a version range for the dependency on `characters`.
+
+## [0.3.0] - 2020-03-05
+- Add `LottieDelegates` a group of options to customize the lottie animation at runtime.
+  ie: Dynamically modify color, position, size, text... of every elements of the animation.
+- Correctly display Linear and Radial Gradients
+- Integrate latest changes from Lottie-android
+
+## [0.2.2] - 2020-02-21
+- Add a [repeat] parameter to specify if the automatic animation should loop.
+- Add the [animate], [reverse], [repeat] properties on `LottieBuilder`
+- Fix bug with `onLoaded` callback when the `LottieProvider` is changed
+
+## [0.2.1] - 2020-02-11
+- Fix a big bug in the path transformation code. A lot more animations look correct now.
+
 ## [0.2.0+1] - 2020-02-04
 - Improve readme
 - (internal) Add golden tests

LICENSE

@@ -1 +1,21 @@
-TODO: Add your license here.
+MIT License
+
+Copyright (c) [year] [fullname]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -4,7 +4,7 @@
 [![pub package](https://img.shields.io/pub/v/lottie.svg)](https://pub.dev/packages/lottie)
 
 Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](http://www.adobe.com/products/aftereffects.html) 
-animations exported as json with [Bodymovin](https://github.com/bodymovin/bodymovin) and renders them natively on mobile!
+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. 
 
@@ -37,7 +37,7 @@ class MyApp extends StatelessWidget {
                 'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/example/assets/Mobilo/A.json'),
 
             // Load an animation and its images from a zip file
-            Lottie.asset('assets/lottiesfiles/angel.zip'),
+            Lottie.asset('assets/lottiefiles/angel.zip'),
           ],
         ),
       ),
@@ -46,15 +46,8 @@ class MyApp extends StatelessWidget {
 }
 ```
 
-To load an animation from the assets folder, we need to add an `assets` section in the `pubspec.yaml`:
-```yaml
-flutter:
-  assets:
-    - assets/
-```
-
 ### Specify a custom `AnimationController`
-This example shows how to have full control over the animation by providing your own `AnimationController`.
+This example shows how to take full control over the animation by providing your own `AnimationController`.
 
 ```dart
 import 'package:flutter/material.dart';
@@ -90,7 +83,7 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
         body: ListView(
           children: [
             Lottie.network(
-              'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/sample_app/assets/Mobilo/C.json',
+              'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/example/assets/Mobilo/C.json',
               controller: _controller,
               onLoaded: (composition) {
                 // Configure the AnimationController with the duration of the
@@ -201,7 +194,9 @@ class _Painter extends CustomPainter {
     var columns = 10;
     for (var i = 0; i < frameCount; i++) {
       var destRect = Offset(i % columns * 50.0, i ~/ 10 * 80.0) & (size / 5);
-      drawable.draw(canvas, destRect, progress: i / frameCount);
+      drawable
+        ..setProgress(i / frameCount)
+        ..draw(canvas, destRect);
     }
   }
 
@@ -212,14 +207,44 @@ class _Painter extends CustomPainter {
 }
 ````
 
+### Modify properties at runtime
+This example shows how to modify some properties of the animation at runtime. Here we change the text,
+the color, the opacity and the position of some layers.
+For each `ValueDelegate` we can either provide a static `value` or a `callback` to compute a value for a each frame.
+
+````dart
+class _Animation extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Lottie.asset(
+      'assets/Tests/Shapes.json',
+      delegates: LottieDelegates(
+          text: (initialText) => translate(initialText),
+          values: [
+            ValueDelegate.color(
+              const ['Shape Layer 1', 'Rectangle', 'Fill 1'],
+              value: Colors.red,
+            ),
+            ValueDelegate.opacity(
+              const ['Shape Layer 1', 'Rectangle'],
+              callback: (frameInfo) =>
+                  (frameInfo.overallProgress * 100).round(),
+            ),
+            ValueDelegate.position(
+              const ['Shape Layer 1', 'Rectangle'],
+              relative: Offset(100, 200),
+            ),
+          ]),
+    );
+  }
+}
+````
+
 ## Limitations
 This is a new library so usability, documentation and performance are still work in progress.
 
-The following features are not yet implemented:
-- Dash path effects
-- Transforms on gradients (stroke and fills)
-- Expose `Value callback` to modify dynamically some properties of the animation
-- Text in animations has very basic support (unoptimized and buggy) 
+Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
+are supported in this port.
 
 ## Flutter Web
 Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`

README.template.md

@@ -4,7 +4,7 @@
 [![pub package](https://img.shields.io/pub/v/lottie.svg)](https://pub.dev/packages/lottie)
 
 Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](http://www.adobe.com/products/aftereffects.html) 
-animations exported as json with [Bodymovin](https://github.com/bodymovin/bodymovin) and renders them natively on mobile!
+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. 
 
@@ -20,15 +20,8 @@ The `Lottie` widget will load the json file and run the animation indefinitely.
 import 'example/lib/examples/main.dart';
 ```
 
-To load an animation from the assets folder, we need to add an `assets` section in the `pubspec.yaml`:
-```yaml
-flutter:
-  assets:
-    - assets/
-```
-
 ### Specify a custom `AnimationController`
-This example shows how to have full control over the animation by providing your own `AnimationController`.
+This example shows how to take full control over the animation by providing your own `AnimationController`.
 
 ```dart
 import 'example/lib/examples/animation_controller.dart';
@@ -69,14 +62,20 @@ a specific position and size.
 import 'example/lib/examples/custom_draw.dart#example';
 ````
 
+### Modify properties at runtime
+This example shows how to modify some properties of the animation at runtime. Here we change the text,
+the color, the opacity and the position of some layers.
+For each `ValueDelegate` we can either provide a static `value` or a `callback` to compute a value for a each frame.
+
+````dart
+import 'example/lib/examples/simple_dynamic_properties.dart#example';
+````
+
 ## Limitations
 This is a new library so usability, documentation and performance are still work in progress.
 
-The following features are not yet implemented:
-- Dash path effects
-- Transforms on gradients (stroke and fills)
-- Expose `Value callback` to modify dynamically some properties of the animation
-- Text in animations has very basic support (unoptimized and buggy) 
+Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
+are supported in this port.
 
 ## Flutter Web
 Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`

analysis_options.yaml

@@ -3,6 +3,7 @@ analyzer:
   errors:
   strong-mode:
     implicit-casts: false
+    implicit-dynamic: false
 linter:
   rules:
     avoid_renaming_method_parameters: true

example/android/app/build.gradle

@@ -8,7 +8,7 @@ if (localPropertiesFile.exists()) {
 
 def flutterRoot = localProperties.getProperty('flutter.sdk')
 if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+    throw new Exception("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
 }
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
@@ -37,8 +37,7 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.example"
+        applicationId "com.github.xvrh.lottie.sample"
         minSdkVersion 16
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()

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

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.example">
+    package="com.github.xvrh.lottie.sample">
     <!-- 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

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.example">
+    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

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

@@ -1,4 +1,4 @@
-package com.example.example
+package com.github.xvrh.lottie.sample
 
 import androidx.annotation.NonNull;
 import io.flutter.embedding.android.FlutterActivity

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

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

example/assets/Tests/TelegramAlphaCompat.json

@@ -0,0 +1,185 @@
+{
+  "v": "5.5.7",
+  "meta": {
+    "g": "LottieFiles AE 0.1.14",
+    "a": "",
+    "k": "",
+    "d": "",
+    "tc": ""
+  },
+  "fr": 60,
+  "ip": 0,
+  "op": 180,
+  "w": 300,
+  "h": 300,
+  "nm": " Square",
+  "ddd": 0,
+  "assets": [],
+  "layers": [
+    {
+      "ddd": 0,
+      "ind": 1,
+      "ty": 4,
+      "nm": "Shape Layer 1",
+      "sr": 1,
+      "ks": {
+        "o": {
+          "a": 0,
+          "k": 100,
+          "ix": 11
+        },
+        "r": {
+          "a": 0,
+          "k": 0,
+          "ix": 10
+        },
+        "p": {
+          "a": 0,
+          "k": [
+            150,
+            150,
+            0
+          ],
+          "ix": 2
+        },
+        "a": {
+          "a": 0,
+          "k": [
+            0,
+            0,
+            0
+          ],
+          "ix": 1
+        },
+        "s": {
+          "a": 0,
+          "k": [
+            100,
+            100,
+            100
+          ],
+          "ix": 6
+        }
+      },
+      "ao": 0,
+      "shapes": [
+        {
+          "ty": "gr",
+          "it": [
+            {
+              "ty": "rc",
+              "d": 1,
+              "s": {
+                "a": 0,
+                "k": [
+                  182.992,
+                  182.992
+                ],
+                "ix": 2
+              },
+              "p": {
+                "a": 0,
+                "k": [
+                  0,
+                  0
+                ],
+                "ix": 3
+              },
+              "r": {
+                "a": 0,
+                "k": 0,
+                "ix": 4
+              },
+              "nm": "Rectangle Path 1",
+              "mn": "ADBE Vector Shape - Rect",
+              "hd": false
+            },
+            {
+              "ty": "fl",
+              "c": {
+                "a": 0,
+                "k": [
+                  1,
+                  0,
+                  0,
+                  255
+                ],
+                "ix": 4
+              },
+              "o": {
+                "a": 0,
+                "k": 100,
+                "ix": 5
+              },
+              "r": 1,
+              "bm": 0,
+              "nm": "Fill 1",
+              "mn": "ADBE Vector Graphic - Fill",
+              "hd": false
+            },
+            {
+              "ty": "tr",
+              "p": {
+                "a": 0,
+                "k": [
+                  -8.504,
+                  1.496
+                ],
+                "ix": 2
+              },
+              "a": {
+                "a": 0,
+                "k": [
+                  0,
+                  0
+                ],
+                "ix": 1
+              },
+              "s": {
+                "a": 0,
+                "k": [
+                  100,
+                  100
+                ],
+                "ix": 3
+              },
+              "r": {
+                "a": 0,
+                "k": 0,
+                "ix": 6
+              },
+              "o": {
+                "a": 0,
+                "k": 100,
+                "ix": 7
+              },
+              "sk": {
+                "a": 0,
+                "k": 0,
+                "ix": 4
+              },
+              "sa": {
+                "a": 0,
+                "k": 0,
+                "ix": 5
+              },
+              "nm": "Transform"
+            }
+          ],
+          "nm": "Rectangle 1",
+          "np": 2,
+          "cix": 2,
+          "bm": 0,
+          "ix": 1,
+          "mn": "ADBE Vector Group",
+          "hd": false
+        }
+      ],
+      "ip": 0,
+      "op": 180,
+      "st": 0,
+      "bm": 0
+    }
+  ],
+  "markers": []
+}

example/ios/Runner.xcodeproj/project.pbxproj

@@ -322,7 +322,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.example;
+				PRODUCT_BUNDLE_IDENTIFIER = com.github.xvrh.lottie.sample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 5.0;
@@ -457,7 +457,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.example;
+				PRODUCT_BUNDLE_IDENTIFIER = com.github.xvrh.lottie.sample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -485,7 +485,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.example;
+				PRODUCT_BUNDLE_IDENTIFIER = com.github.xvrh.lottie.sample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 5.0;

example/lib/examples/animate_no_repeat.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() async {
+  runApp(App());
+}
+
+class App extends StatefulWidget {
+  const App({Key key}) : super(key: key);
+
+  @override
+  _AppState createState() => _AppState();
+}
+
+class _AppState extends State<App> with TickerProviderStateMixin {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      color: Colors.lightBlue,
+      home: Scaffold(
+        backgroundColor: Colors.lightBlue,
+        appBar: AppBar(
+          title: Text(''),
+        ),
+        body: Center(
+          child: SizedBox(
+            width: 300,
+            height: 300,
+            child: Lottie.asset(
+              'assets/LottieLogo1.json',
+              animate: true,
+              repeat: false,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/animation_controller.dart

@@ -31,7 +31,7 @@ class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
         body: ListView(
           children: [
             Lottie.network(
-              'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/sample_app/assets/Mobilo/C.json',
+              'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/example/assets/Mobilo/C.json',
               controller: _controller,
               onLoaded: (composition) {
                 // Configure the AnimationController with the duration of the

example/lib/examples/custom_draw.dart

@@ -81,7 +81,9 @@ class _Painter extends CustomPainter {
     var columns = 10;
     for (var i = 0; i < frameCount; i++) {
       var destRect = Offset(i % columns * 50.0, i ~/ 10 * 80.0) & (size / 5);
-      drawable.draw(canvas, destRect, progress: i / frameCount);
+      drawable
+        ..setProgress(i / frameCount)
+        ..draw(canvas, destRect);
     }
   }
 

example/lib/examples/dynamic_properties.dart

@@ -0,0 +1,86 @@
+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());
+}
+
+class App extends StatefulWidget {
+  const App({Key key}) : super(key: key);
+
+  @override
+  _AppState createState() => _AppState();
+}
+
+class _AppState extends State<App> with TickerProviderStateMixin {
+  Color _color = Colors.green;
+  double _opacity = 0.5;
+  bool _useDelegates = true;
+
+  @override
+  Widget build(BuildContext context) {
+    var valueDelegates = [
+      ValueDelegate.color(['Shape Layer 1', 'Rectangle', 'Fill 1'],
+          value: _color),
+      ValueDelegate.opacity(['Shape Layer 1', 'Rectangle', 'Fill 1'],
+          callback: (_) => (_opacity * 100).round()),
+    ];
+
+    return MaterialApp(
+      color: Colors.blue,
+      home: Scaffold(
+        backgroundColor: Colors.white,
+        appBar: AppBar(
+          title: Text('Dynamic properties'),
+        ),
+        body: ListView(
+          children: <Widget>[
+            SizedBox(
+              width: 300,
+              height: 300,
+              child: Lottie.asset(
+                'assets/Tests/Shapes.json',
+                delegates: LottieDelegates(
+                    values: _useDelegates ? valueDelegates : null),
+              ),
+            ),
+            Checkbox(
+              value: _useDelegates,
+              onChanged: (newValue) {
+                setState(() {
+                  _useDelegates = newValue;
+                });
+              },
+            ),
+            Slider(
+              value: _opacity,
+              onChanged: (newOpacity) {
+                setState(() {
+                  _opacity = newOpacity;
+                });
+              },
+            ),
+            Center(
+              child: Container(
+                width: 500,
+                child: ColorPicker(
+                  pickerColor: _color,
+                  onColorChanged: (newColor) {
+                    setState(() {
+                      _color = newColor;
+                    });
+                  },
+                  showLabel: false,
+                  enableAlpha: false,
+                  pickerAreaHeightPercent: 0.8,
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/dynamic_text.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() async {
+  runApp(App());
+}
+
+class App extends StatefulWidget {
+  const App({Key key}) : super(key: key);
+
+  @override
+  _AppState createState() => _AppState();
+}
+
+class _AppState extends State<App> with TickerProviderStateMixin {
+  TextEditingController _textController;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _textController = TextEditingController(text: /*'🔥Fire🔥'*/ 'Fire');
+  }
+
+  @override
+  void dispose() {
+    _textController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      color: Colors.blue,
+      home: Scaffold(
+        backgroundColor: Colors.white,
+        appBar: AppBar(
+          title: Text('Dynamic text'),
+        ),
+        body: Center(
+          child: Column(
+            children: <Widget>[
+              SizedBox(
+                width: 300,
+                height: 300,
+                child: Lottie.asset(
+                  'assets/Tests/DynamicText.json',
+                  delegates: LottieDelegates(
+                    text: (animationText) => _textController.text,
+                    textStyle: (font) => TextStyle(
+                        fontFamily: font.fontFamily,
+                        fontStyle: FontStyle.italic),
+                  ),
+                ),
+              ),
+              Container(
+                width: 300,
+                child: CupertinoTextField(
+                  controller: _textController,
+                  onChanged: (newText) {
+                    setState(() {});
+                  },
+                ),
+              )
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/hide_after_complete.dart

@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() async {
+  runApp(App());
+}
+
+class App extends StatefulWidget {
+  const App({Key key}) : super(key: key);
+
+  @override
+  _AppState createState() => _AppState();
+}
+
+class _AppState extends State<App> with TickerProviderStateMixin {
+  AnimationController _animationController;
+  bool _showAnimation = true;
+
+  @override
+  void initState() {
+    super.initState();
+    _animationController = AnimationController(vsync: this)
+      ..addStatusListener((status) {
+        if (status == AnimationStatus.completed) {
+          setState(() {
+            _showAnimation = false;
+          });
+        }
+      });
+  }
+
+  @override
+  void dispose() {
+    _animationController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      color: Colors.lightBlue,
+      home: Scaffold(
+        backgroundColor: Colors.lightBlue,
+        appBar: AppBar(
+          title: Text('Show lottie animation: $_showAnimation'),
+        ),
+        body: SingleChildScrollView(
+          child: Center(
+            child: Column(
+              children: [
+                if (_showAnimation)
+                  Lottie.asset(
+                    'assets/LottieLogo1.json',
+                    controller: _animationController,
+                    width: 200,
+                    onLoaded: (composition) {
+                      _animationController
+                        ..duration = composition.duration
+                        ..reset()
+                        ..forward();
+                    },
+                  ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/main.dart

@@ -18,7 +18,7 @@ class MyApp extends StatelessWidget {
                 'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/example/assets/Mobilo/A.json'),
 
             // Load an animation and its images from a zip file
-            Lottie.asset('assets/lottiesfiles/angel.zip'),
+            Lottie.asset('assets/lottiefiles/angel.zip'),
           ],
         ),
       ),

example/lib/examples/run_once.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/material.dart';
+import 'package:logging/logging.dart';
+import 'package:lottie/lottie.dart';
+import '../src/all_files.g.dart';
+
+void main() async {
+  Logger.root
+    ..level = Level.ALL
+    ..onRecord.listen(print);
+
+  runApp(App());
+}
+
+class App extends StatefulWidget {
+  const App({Key key}) : super(key: key);
+
+  @override
+  _AppState createState() => _AppState();
+}
+
+class _AppState extends State<App> with TickerProviderStateMixin {
+  int _index = 0;
+  AnimationController _animationController;
+
+  @override
+  void initState() {
+    super.initState();
+    _animationController = AnimationController(vsync: this)
+      ..addStatusListener((status) {
+        if (status == AnimationStatus.completed) {
+          setState(() {
+            ++_index;
+          });
+        }
+      });
+  }
+
+  @override
+  void dispose() {
+    _animationController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      color: Colors.lightBlue,
+      home: Scaffold(
+        backgroundColor: Colors.lightBlue,
+        appBar: AppBar(
+          title: Text('$_index'),
+        ),
+        body: SingleChildScrollView(
+          child: Center(
+            child: Column(
+              children: [
+                Lottie.asset(files[_index % files.length],
+                    controller: _animationController, onLoaded: (composition) {
+                  _animationController
+                    ..duration = composition.duration
+                    ..reset()
+                    ..forward();
+                }),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

example/lib/examples/simple_dynamic_properties.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [_Animation()],
+        ),
+      ),
+    );
+  }
+}
+
+String translate(String input) => '**$input**';
+
+//--- example
+class _Animation extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Lottie.asset(
+      'assets/Tests/Shapes.json',
+      delegates: LottieDelegates(
+          text: (initialText) => translate(initialText),
+          values: [
+            ValueDelegate.color(
+              const ['Shape Layer 1', 'Rectangle', 'Fill 1'],
+              value: Colors.red,
+            ),
+            ValueDelegate.opacity(
+              const ['Shape Layer 1', 'Rectangle'],
+              callback: (frameInfo) =>
+                  (frameInfo.overallProgress * 100).round(),
+            ),
+            ValueDelegate.position(
+              const ['Shape Layer 1', 'Rectangle'],
+              relative: Offset(100, 200),
+            ),
+          ]),
+    );
+  }
+}
+//---

example/lib/main.dart

@@ -2,14 +2,13 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:logging/logging.dart';
 import 'package:lottie/lottie.dart';
-import 'package:lottie/src/l.dart';
 import 'src/all_files.g.dart';
 
 void main() {
   Logger.root
     ..level = Level.ALL
     ..onRecord.listen(print);
-  L.setTraceEnabled(true);
+  Lottie.traceEnabled = true;
   runApp(App());
 }
 
@@ -43,8 +42,8 @@ class App extends StatelessWidget {
                 ),
               ),
               onTap: () {
-                Navigator.of(context).push(
-                    MaterialPageRoute(builder: (context) => Detail(assetName)));
+                Navigator.of(context).push(MaterialPageRoute<void>(
+                    builder: (context) => Detail(assetName)));
               },
             );
           },
@@ -66,7 +65,6 @@ class _Item extends StatelessWidget {
       child: Container(
         decoration: BoxDecoration(
             color: Colors.white,
-            //border: Border.all(color: Colors.black12),
             borderRadius: BorderRadius.all(Radius.circular(10)),
             boxShadow: [
               BoxShadow(

example/lib/src/all_files.g.dart

@@ -1,341 +1,343 @@
 // Generated from tool/generate_file_list.dart
 final files = [
   'assets/14595-thumbs-up.json',
-  'assets/Mobilo/T.json',
+  'assets/AndroidWave.json',
+  'assets/DynamicGradient.json',
+  'assets/HamburgerArrow.json',
+  'assets/Logo/LogoSmall.json',
+  'assets/LottieLogo1.json',
+  'assets/LottieLogo2.json',
   'assets/Mobilo/A.json',
-  'assets/Mobilo/X.json',
-  'assets/Mobilo/BlinkingCursor.json',
-  'assets/Mobilo/M.json',
-  'assets/Mobilo/L.json',
-  'assets/Mobilo/Y.json',
-  'assets/Mobilo/U.json',
-  'assets/Mobilo/K.json',
-  'assets/Mobilo/R.json',
-  'assets/Mobilo/G.json',
-  'assets/Mobilo/F.json',
-  'assets/Mobilo/S.json',
-  'assets/Mobilo/J.json',
-  'assets/Mobilo/I.json',
-  'assets/Mobilo/E.json',
   'assets/Mobilo/Apostrophe.json',
+  'assets/Mobilo/B.json',
+  'assets/Mobilo/BlinkingCursor.json',
+  'assets/Mobilo/C.json',
+  'assets/Mobilo/Colon.json',
+  'assets/Mobilo/Comma.json',
+  'assets/Mobilo/D.json',
+  'assets/Mobilo/E.json',
+  'assets/Mobilo/F.json',
+  'assets/Mobilo/G.json',
+  'assets/Mobilo/H.json',
+  'assets/Mobilo/I.json',
+  'assets/Mobilo/J.json',
+  'assets/Mobilo/K.json',
+  'assets/Mobilo/L.json',
+  'assets/Mobilo/M.json',
+  'assets/Mobilo/N.json',
+  'assets/Mobilo/O.json',
   'assets/Mobilo/P.json',
   'assets/Mobilo/Q.json',
-  'assets/Mobilo/D.json',
-  'assets/Mobilo/Colon.json',
-  'assets/Mobilo/H.json',
-  'assets/Mobilo/C.json',
+  'assets/Mobilo/R.json',
+  'assets/Mobilo/S.json',
+  'assets/Mobilo/T.json',
+  'assets/Mobilo/U.json',
   'assets/Mobilo/V.json',
-  'assets/Mobilo/Comma.json',
-  'assets/Mobilo/O.json',
-  'assets/Mobilo/Z.json',
-  'assets/Mobilo/N.json',
   'assets/Mobilo/W.json',
-  'assets/Mobilo/B.json',
-  'assets/HamburgerArrow.json',
-  'assets/Tests/Remap.json',
-  'assets/Tests/Airbnb400.zip',
-  'assets/Tests/catrim_converted.json',
-  'assets/Tests/StartEndFrame.json',
-  'assets/Tests/TrackMattes.json',
-  'assets/Tests/DynamicText.json',
-  'assets/Tests/Precomps.json',
-  'assets/Tests/2ParentsMatte.json',
+  'assets/Mobilo/X.json',
+  'assets/Mobilo/Y.json',
+  'assets/Mobilo/Z.json',
   'assets/Tests/2FrameAnimation.json',
-  'assets/Tests/LoopPlayOnce.json',
-  'assets/Tests/bm_converted.json',
-  'assets/Tests/RGBMarker.json',
-  'assets/Tests/WeAccept.json',
-  'assets/Tests/MiterLimit.json',
-  'assets/Tests/dalek.json',
-  'assets/Tests/MaskInv.json',
-  'assets/Tests/MatteTimeStretchScan.json',
-  'assets/Tests/Marker.json',
-  'assets/Tests/TrimPathsInsideAndOutsideGroup.json',
-  'assets/Tests/MaskNone.json',
-  'assets/Tests/Text_Justification_Translate_Scale_Rotation_Text.json',
-  'assets/Tests/InterpolatorLoopBack.json',
-  'assets/Tests/SplitDimensions.json',
-  'assets/Tests/EndFrame.json',
-  'assets/Tests/RGB.json',
-  'assets/Tests/DynamicGradient.json',
-  'assets/Tests/Font_Text_Justification_Translate_Scale_Rotation_Test.json',
-  'assets/Tests/adrock_converted.json',
-  'assets/Tests/ShapeTypes.json',
-  'assets/Tests/Squares.json',
-  'assets/Tests/Parenting.json',
-  'assets/Tests/catrim.json',
-  'assets/Tests/Stroke.json',
-  'assets/Tests/TimeStretch.json',
-  'assets/Tests/CheckSwitch.json',
-  'assets/Tests/hd.json',
-  'assets/Tests/OverlapShapeWithOpacity.json',
-  'assets/Tests/Shapes.json',
-  'assets/Tests/Masks.json',
-  'assets/Tests/SolidLayerTransform.json',
-  'assets/Tests/WeAcceptInlineImage.json',
-  'assets/Tests/TrimPaths.json',
+  'assets/Tests/2ParentsMatte.json',
   'assets/Tests/Airbnb.zip',
-  'assets/Tests/DifferentPointsCount.json',
-  'assets/Tests/Skew.json',
-  'assets/Tests/GradientFill.json',
-  'assets/Tests/TransformWithoutEndValues.json',
-  'assets/Tests/EllipseDirection.json',
-  'assets/Tests/TimeStretchMask.json',
-  'assets/Tests/Frame.json',
-  'assets/Tests/map.zip',
-  'assets/Tests/august_view_pulse.zip',
-  'assets/Tests/KeyframeTypes.json',
-  'assets/Tests/dalek_converted.json',
-  'assets/Tests/Laugh4.json',
-  'assets/Tests/Scale0.json',
-  'assets/Tests/StarSkew.json',
-  'assets/Tests/TextBaseline.json',
-  'assets/Tests/Text.json',
-  'assets/Tests/bm.json',
-  'assets/Tests/Fill.json',
-  'assets/Tests/MaskA.json',
-  'assets/Tests/Repeater.json',
-  'assets/Tests/TimeStretchPrecomp.json',
-  'assets/Tests/adrock.json',
-  'assets/Tests/MatteTimeStretchLine.json',
+  'assets/Tests/Airbnb400.zip',
   'assets/Tests/Airbnb800.zip',
-  'assets/DynamicGradient.json',
-  'assets/LottieLogo2.json',
-  'assets/AndroidWave.json',
-  'assets/LottieLogo1.json',
-  'assets/Logo/LogoSmall.json',
-  'assets/lottiefiles/the_final_frontier.json',
+  'assets/Tests/CheckSwitch.json',
+  'assets/Tests/DifferentPointsCount.json',
+  'assets/Tests/DynamicGradient.json',
+  'assets/Tests/DynamicText.json',
+  'assets/Tests/EllipseDirection.json',
+  'assets/Tests/EndFrame.json',
+  'assets/Tests/Fill.json',
+  'assets/Tests/Font_Text_Justification_Translate_Scale_Rotation_Test.json',
+  'assets/Tests/Frame.json',
+  'assets/Tests/GradientFill.json',
+  'assets/Tests/InterpolatorLoopBack.json',
+  'assets/Tests/KeyframeTypes.json',
+  'assets/Tests/Laugh4.json',
+  'assets/Tests/LoopPlayOnce.json',
+  'assets/Tests/Marker.json',
+  'assets/Tests/MaskA.json',
+  'assets/Tests/MaskInv.json',
+  'assets/Tests/MaskNone.json',
+  'assets/Tests/Masks.json',
+  'assets/Tests/MatteTimeStretchLine.json',
+  'assets/Tests/MatteTimeStretchScan.json',
+  'assets/Tests/MiterLimit.json',
+  'assets/Tests/OverlapShapeWithOpacity.json',
+  'assets/Tests/Parenting.json',
+  'assets/Tests/Precomps.json',
+  'assets/Tests/RGB.json',
+  'assets/Tests/RGBMarker.json',
+  'assets/Tests/Remap.json',
+  'assets/Tests/Repeater.json',
+  'assets/Tests/Scale0.json',
+  'assets/Tests/ShapeTypes.json',
+  'assets/Tests/Shapes.json',
+  'assets/Tests/Skew.json',
+  'assets/Tests/SolidLayerTransform.json',
+  'assets/Tests/SplitDimensions.json',
+  'assets/Tests/Squares.json',
+  'assets/Tests/StarSkew.json',
+  'assets/Tests/StartEndFrame.json',
+  'assets/Tests/Stroke.json',
+  'assets/Tests/TelegramAlphaCompat.json',
+  'assets/Tests/Text.json',
+  'assets/Tests/TextBaseline.json',
+  'assets/Tests/Text_Justification_Translate_Scale_Rotation_Text.json',
+  'assets/Tests/TimeRemapAndStartOffset.json',
+  'assets/Tests/TimeStretch.json',
+  'assets/Tests/TimeStretchMask.json',
+  'assets/Tests/TimeStretchPrecomp.json',
+  'assets/Tests/TrackMattes.json',
+  'assets/Tests/TransformWithoutEndValues.json',
+  'assets/Tests/TrimPaths.json',
+  'assets/Tests/TrimPathsInsideAndOutsideGroup.json',
+  'assets/Tests/WeAccept.json',
+  'assets/Tests/WeAcceptInlineImage.json',
+  'assets/Tests/adrock.json',
+  'assets/Tests/adrock_converted.json',
+  'assets/Tests/august_view_pulse.zip',
+  'assets/Tests/bm.json',
+  'assets/Tests/bm_converted.json',
+  'assets/Tests/catrim.json',
+  'assets/Tests/catrim_converted.json',
+  'assets/Tests/dalek.json',
+  'assets/Tests/dalek_converted.json',
+  'assets/Tests/hd.json',
+  'assets/Tests/map.zip',
+  'assets/lf20_w2Afea.json',
+  'assets/lottiefiles/100_percent.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',
+  'assets/lottiefiles/android_fingerprint.json',
+  'assets/lottiefiles/angel.zip',
+  'assets/lottiefiles/anima.json',
+  'assets/lottiefiles/animated_graph.json',
+  'assets/lottiefiles/animated_laptop_.json',
+  'assets/lottiefiles/animated_logo.json',
+  'assets/lottiefiles/atm_link.json',
+  'assets/lottiefiles/autoconnect_loading.json',
+  'assets/lottiefiles/ball_&_map.zip',
+  'assets/lottiefiles/banner_animation.json',
+  'assets/lottiefiles/bb8.json',
+  'assets/lottiefiles/bell.json',
+  'assets/lottiefiles/birds.json',
+  'assets/lottiefiles/bitcoin_to_the_moon.json',
+  'assets/lottiefiles/blood_transfusion_kawaii.json',
+  'assets/lottiefiles/bomb.json',
+  'assets/lottiefiles/books.json',
+  'assets/lottiefiles/bootymovin.json',
+  'assets/lottiefiles/bounching_ball.json',
+  'assets/lottiefiles/brain__.json',
+  'assets/lottiefiles/browser.json',
+  'assets/lottiefiles/building_evolution_animation.json',
+  'assets/lottiefiles/camera.json',
+  'assets/lottiefiles/camptravel.zip',
+  'assets/lottiefiles/cancel_button.json',
+  'assets/lottiefiles/cash.json',
+  'assets/lottiefiles/change_to_search_bar.json',
+  'assets/lottiefiles/check_pop.json',
+  'assets/lottiefiles/chinese.json',
+  'assets/lottiefiles/clock.json',
+  'assets/lottiefiles/cloud_disconnection.json',
+  'assets/lottiefiles/code_invite_success.json',
+  'assets/lottiefiles/coding_ape.json',
+  'assets/lottiefiles/coinfall.json',
+  'assets/lottiefiles/colorline.json',
+  'assets/lottiefiles/confusion.json',
+  'assets/lottiefiles/construction_site.json',
+  'assets/lottiefiles/cooking_app.json',
+  'assets/lottiefiles/countdown.json',
+  'assets/lottiefiles/credit_card.json',
+  'assets/lottiefiles/credit_level.json',
+  'assets/lottiefiles/cube_loader.json',
+  'assets/lottiefiles/cubo_livre.json',
+  'assets/lottiefiles/curly_hair_character_loop.json',
+  'assets/lottiefiles/cycle_animation.json',
+  'assets/lottiefiles/day_night_cycle.json',
+  'assets/lottiefiles/day_of_the_dead.json',
+  'assets/lottiefiles/deadpool.json',
+  'assets/lottiefiles/delivery_van.json',
+  'assets/lottiefiles/developer-animation.zip',
+  'assets/lottiefiles/dna_loader.json',
+  'assets/lottiefiles/dog.json',
+  'assets/lottiefiles/done.json',
+  'assets/lottiefiles/download copy.json',
+  'assets/lottiefiles/download.json',
+  'assets/lottiefiles/downloader.json',
+  'assets/lottiefiles/drop.json',
+  'assets/lottiefiles/drop_to_refresh.json',
+  'assets/lottiefiles/edited-landscape.json',
+  'assets/lottiefiles/elephant_trunk_swing.json',
+  'assets/lottiefiles/emoji_shock.json',
+  'assets/lottiefiles/emoji_tongue.json',
+  'assets/lottiefiles/emoji_wink.json',
+  'assets/lottiefiles/empty_status.json',
+  'assets/lottiefiles/estimate.json',
+  'assets/lottiefiles/fab_animate.json',
+  'assets/lottiefiles/fabulous_onboarding_animation.json',
+  'assets/lottiefiles/favourite_app_icon.json',
+  'assets/lottiefiles/file_error.json',
+  'assets/lottiefiles/finance_animation.json',
+  'assets/lottiefiles/fingerprint_scanner.json',
+  'assets/lottiefiles/finish,done.json',
+  'assets/lottiefiles/fish.json',
+  'assets/lottiefiles/flag_of_mexico.json',
+  'assets/lottiefiles/flow.json',
+  'assets/lottiefiles/frog.json',
+  'assets/lottiefiles/funky_chicken.json',
+  'assets/lottiefiles/gaming_pad.json',
+  'assets/lottiefiles/gears.json',
+  'assets/lottiefiles/geometry.zip',
+  'assets/lottiefiles/glow_loading.json',
+  'assets/lottiefiles/gradient_animated_background.json',
+  'assets/lottiefiles/happy birthday.json',
+  'assets/lottiefiles/hardware.json',
+  'assets/lottiefiles/hint_01.json',
+  'assets/lottiefiles/im_thirsty.json',
+  'assets/lottiefiles/immiguide_.json',
+  'assets/lottiefiles/in-app_purchasing.json',
+  'assets/lottiefiles/india.json',
+  'assets/lottiefiles/infinite_rainbow.json',
+  'assets/lottiefiles/intelia_logo_animation.json',
+  'assets/lottiefiles/iphone_x_loading.json',
+  'assets/lottiefiles/jojo_the_bird.json',
+  'assets/lottiefiles/jolly_walker.json',
+  'assets/lottiefiles/judgement.json',
+  'assets/lottiefiles/kod.io_logo_reveal.json',
+  'assets/lottiefiles/la_calavera.json',
+  'assets/lottiefiles/landing_page.json',
+  'assets/lottiefiles/lego_loader.json',
+  'assets/lottiefiles/light.json',
+  'assets/lottiefiles/lightsaber.json',
+  'assets/lottiefiles/little_girl_jumping_-_loader.json',
+  'assets/lottiefiles/loading.json',
+  'assets/lottiefiles/loading_copy.json',
+  'assets/lottiefiles/loading_disc.json',
+  'assets/lottiefiles/loading_semicircle.json',
+  'assets/lottiefiles/location.json',
+  'assets/lottiefiles/location_marker.json',
+  'assets/lottiefiles/location_pin.json',
+  'assets/lottiefiles/lottie_logo_1.json',
+  'assets/lottiefiles/lottiepreview_qr.json',
+  'assets/lottiefiles/mailsent.json',
+  'assets/lottiefiles/man_and_pay_with_credit_card.json',
+  'assets/lottiefiles/map_animation.json',
+  'assets/lottiefiles/material loading.json',
+  'assets/lottiefiles/material_loader.json',
   'assets/lottiefiles/material_loading_2.json',
   'assets/lottiefiles/material_wave_loading.json',
-  'assets/lottiefiles/finish,done.json',
-  'assets/lottiefiles/rocket.json',
-  'assets/lottiefiles/chinese.json',
-  'assets/lottiefiles/cubo_livre.json',
-  'assets/lottiefiles/slack_app_loader.json',
-  'assets/lottiefiles/no_internet_connection.json',
-  'assets/lottiefiles/moving_eye.json',
-  'assets/lottiefiles/downloader.json',
-  'assets/lottiefiles/poo_loader.json',
-  'assets/lottiefiles/airbnb.json',
-  'assets/lottiefiles/phonological.json',
-  'assets/lottiefiles/camptravel.zip',
-  'assets/lottiefiles/bounching_ball.json',
-  'assets/lottiefiles/walking.json',
-  'assets/lottiefiles/coding_ape.json',
-  'assets/lottiefiles/clock.json',
-  'assets/lottiefiles/timer_(3_second_loop).json',
-  'assets/lottiefiles/file_error.json',
-  'assets/lottiefiles/android_fingerprint.json',
-  'assets/lottiefiles/patient_successfully_added.json',
-  'assets/lottiefiles/toggle_switch.json',
-  'assets/lottiefiles/notification_request.json',
-  'assets/lottiefiles/loading disc.json',
-  'assets/lottiefiles/tractor_animation.json',
-  'assets/lottiefiles/Plane.json',
-  'assets/lottiefiles/retweet.json',
-  'assets/lottiefiles/blood_transfusion_kawaii.json',
-  'assets/lottiefiles/truecosmos.json',
-  'assets/lottiefiles/banner_animation.json',
-  'assets/lottiefiles/gears.json',
-  'assets/lottiefiles/progress_bar 2.json',
-  'assets/lottiefiles/flag_of_mexico.json',
-  'assets/lottiefiles/location_pin.json',
-  'assets/lottiefiles/play,_pause.json',
-  'assets/lottiefiles/panel2d.json',
-  'assets/lottiefiles/emoji_tongue.json',
-  'assets/lottiefiles/jolly_walker.json',
-  'assets/lottiefiles/switch_loop.json',
-  'assets/lottiefiles/intelia_logo_animation.json',
-  'assets/lottiefiles/credit_card.json',
-  'assets/lottiefiles/empty_status.json',
-  'assets/lottiefiles/autoconnect_loading.json',
-  'assets/lottiefiles/camera.json',
-  'assets/lottiefiles/volume_indicator.json',
-  'assets/lottiefiles/bell.json',
-  'assets/lottiefiles/colorline.json',
-  'assets/lottiefiles/mailsent.json',
-  'assets/lottiefiles/square_drop_loader.json',
-  'assets/lottiefiles/gradient_animated_background.json',
-  'assets/lottiefiles/vr_animation.json',
-  'assets/lottiefiles/rocksauce_title_card.json',
-  'assets/lottiefiles/streetby_test_loading.json',
-  'assets/lottiefiles/hardware.json',
-  'assets/lottiefiles/man_and_pay_with_credit_card.json',
-  'assets/lottiefiles/tractor.json',
-  'assets/lottiefiles/brain__.json',
-  'assets/lottiefiles/summer.json',
-  'assets/lottiefiles/passport.json',
-  'assets/lottiefiles/drop_to_refresh.json',
-  'assets/lottiefiles/penguin.json',
-  'assets/lottiefiles/location_marker.json',
-  'assets/lottiefiles/dna_loader.json',
-  'assets/lottiefiles/geometry.zip',
-  'assets/lottiefiles/pink_drink_machine.json',
-  'assets/lottiefiles/sensor_scan.zip',
-  'assets/lottiefiles/fingerprint_scanner.json',
-  'assets/lottiefiles/play_button.json',
-  'assets/lottiefiles/jojo_the_bird.json',
-  'assets/lottiefiles/cloud_disconnection.json',
-  'assets/lottiefiles/dog.json',
-  'assets/lottiefiles/loading.json',
-  'assets/lottiefiles/curly_hair_character_loop.json',
-  'assets/lottiefiles/india.json',
-  'assets/lottiefiles/anima.json',
-  'assets/lottiefiles/volume_shake_indicator.json',
-  'assets/lottiefiles/rating.json',
-  'assets/lottiefiles/birds.json',
-  'assets/lottiefiles/in-app_purchasing.json',
-  'assets/lottiefiles/rejection.json',
-  'assets/lottiefiles/judgement.json',
-  'assets/lottiefiles/splashy_loader.json',
-  'assets/lottiefiles/construction_site.json',
-  'assets/lottiefiles/download.json',
-  'assets/lottiefiles/uk.json',
-  'assets/lottiefiles/location.json',
-  'assets/lottiefiles/change_to_search_bar.json',
-  'assets/lottiefiles/x_pop.json',
-  'assets/lottiefiles/socar_logo.json',
-  'assets/lottiefiles/fish.json',
-  'assets/lottiefiles/landing_page.json',
-  'assets/lottiefiles/turbine.json',
-  'assets/lottiefiles/ofrenda.json',
-  'assets/lottiefiles/emoji_shock.json',
-  'assets/lottiefiles/sky.zip',
-  'assets/lottiefiles/bb8.json',
-  'assets/lottiefiles/powerupp_app_onboard (1).json',
-  'assets/lottiefiles/im_thirsty.json',
-  'assets/lottiefiles/permission.json',
-  'assets/lottiefiles/animated_logo.json',
-  'assets/lottiefiles/youtube_icon_reveal.json',
-  'assets/lottiefiles/fab_animate.json',
-  'assets/lottiefiles/money.json',
-  'assets/lottiefiles/pagado.json',
-  'assets/lottiefiles/servishero_loading.json',
   'assets/lottiefiles/me_at_office.json',
-  'assets/lottiefiles/swiftkey-logo.json',
-  'assets/lottiefiles/favourite_app_icon.json',
-  'assets/lottiefiles/atm_link.json',
-  'assets/lottiefiles/emoji_wink.json',
-  'assets/lottiefiles/preloader.json',
-  'assets/lottiefiles/us.json',
-  'assets/lottiefiles/soda_loader.json',
+  'assets/lottiefiles/medal.json',
+  'assets/lottiefiles/menuButton2.json',
+  'assets/lottiefiles/menu_button_alt.json',
+  'assets/lottiefiles/mindful.json',
+  'assets/lottiefiles/mnemonics.json',
+  'assets/lottiefiles/money.json',
+  'assets/lottiefiles/motorcycle.json',
+  'assets/lottiefiles/moving bus.json',
+  'assets/lottiefiles/moving_eye.json',
+  'assets/lottiefiles/no_internet_connection.json',
+  'assets/lottiefiles/notification_request.json',
+  'assets/lottiefiles/octopus.json',
+  'assets/lottiefiles/ofrenda.json',
+  'assets/lottiefiles/on_off_settings_switch.json',
+  'assets/lottiefiles/pagado.json',
+  'assets/lottiefiles/pagination.json',
+  'assets/lottiefiles/panel2d.json',
+  'assets/lottiefiles/passport.json',
+  'assets/lottiefiles/patient_successfully_added.json',
+  'assets/lottiefiles/payme.json',
+  'assets/lottiefiles/peli-canon.json',
+  'assets/lottiefiles/pen_tool_loop.json',
+  'assets/lottiefiles/pencil_write.json',
+  'assets/lottiefiles/penguin.json',
+  'assets/lottiefiles/permission.json',
+  'assets/lottiefiles/personal_character.json',
+  'assets/lottiefiles/ph_onboarding_.json',
+  'assets/lottiefiles/phonological.json',
+  'assets/lottiefiles/pink_drink_machine.json',
+  'assets/lottiefiles/plane_to_dollar.json',
+  'assets/lottiefiles/play,_pause.json',
   'assets/lottiefiles/play_and_like_it.json',
+  'assets/lottiefiles/play_button.json',
+  'assets/lottiefiles/playing.json',
+  'assets/lottiefiles/point.json',
+  'assets/lottiefiles/poo_loader.json',
+  'assets/lottiefiles/powerupp_app_onboard (1).json',
+  'assets/lottiefiles/powerupp_app_onboard.json',
+  'assets/lottiefiles/preloader.json',
+  'assets/lottiefiles/print.json',
+  'assets/lottiefiles/progress_bar 2.json',
+  'assets/lottiefiles/progress_bar.json',
+  'assets/lottiefiles/rating.json',
+  'assets/lottiefiles/red_pocket_pop_up.json',
+  'assets/lottiefiles/rejection.json',
+  'assets/lottiefiles/retweet.json',
+  'assets/lottiefiles/rocket.json',
+  'assets/lottiefiles/rocksauce_title_card.json',
+  'assets/lottiefiles/scan.json',
+  'assets/lottiefiles/scan_qr_code_success.json',
+  'assets/lottiefiles/search_button.json',
+  'assets/lottiefiles/security_token_roundtable.zip',
+  'assets/lottiefiles/sensor_scan.zip',
+  'assets/lottiefiles/servishero_loading.json',
+  'assets/lottiefiles/simple_loader.json',
+  'assets/lottiefiles/sky.zip',
+  'assets/lottiefiles/slack_app_loader.json',
+  'assets/lottiefiles/snowcation.json',
+  'assets/lottiefiles/socar_logo.json',
+  'assets/lottiefiles/soda_loader.json',
+  'assets/lottiefiles/spacehub.json',
+  'assets/lottiefiles/spinner loading.json',
+  'assets/lottiefiles/splashy_loader.json',
+  'assets/lottiefiles/square_drop_loader.json',
+  'assets/lottiefiles/star 2.json',
+  'assets/lottiefiles/streetby_test_loading.json',
+  'assets/lottiefiles/submit button.json',
+  'assets/lottiefiles/summer.json',
+  'assets/lottiefiles/sushi_and_wine.zip',
+  'assets/lottiefiles/swiftkey-logo.json',
+  'assets/lottiefiles/swipe_menu.json',
+  'assets/lottiefiles/swipe_right_indicator.json',
+  'assets/lottiefiles/switch_loop.json',
+  'assets/lottiefiles/the_final_frontier.json',
+  'assets/lottiefiles/tigerobo_demo.json',
+  'assets/lottiefiles/timer_(3_second_loop).json',
+  'assets/lottiefiles/toggle.json',
+  'assets/lottiefiles/toggle_switch.json',
+  'assets/lottiefiles/touch_id.json',
+  'assets/lottiefiles/tractor.json',
+  'assets/lottiefiles/tractor_animation.json',
+  'assets/lottiefiles/trail_loading.json',
   'assets/lottiefiles/trophy.json',
   'assets/lottiefiles/trophy_animation.zip',
-  'assets/lottiefiles/countdown.json',
-  'assets/lottiefiles/glow_loading.json',
-  'assets/lottiefiles/developer-animation.zip',
-  'assets/lottiefiles/bitcoin_to_the_moon.json',
-  'assets/lottiefiles/credit_level.json',
-  'assets/lottiefiles/medal.json',
-  'assets/lottiefiles/xamarin_logo_2.json',
-  'assets/lottiefiles/loading copy.json',
-  'assets/lottiefiles/done.json',
-  'assets/lottiefiles/plane_to_dollar.json',
-  'assets/lottiefiles/octopus.json',
-  'assets/lottiefiles/finance_animation.json',
-  'assets/lottiefiles/download copy.json',
-  'assets/lottiefiles/frog.json',
-  'assets/lottiefiles/yoga_carpet.json',
-  'assets/lottiefiles/sushi_and_wine.zip',
-  'assets/lottiefiles/payme.json',
-  'assets/lottiefiles/lego_loader.json',
-  'assets/lottiefiles/deadpool.json',
-  'assets/lottiefiles/updating_map.json',
-  'assets/lottiefiles/elephant_trunk_swing.json',
-  'assets/lottiefiles/lottie_logo_1.json',
-  'assets/lottiefiles/tigerobo_demo.json',
-  'assets/lottiefiles/100_percent.json',
-  'assets/lottiefiles/flow.json',
-  'assets/lottiefiles/hint_01.json',
-  'assets/lottiefiles/moving bus.json',
-  'assets/lottiefiles/light.json',
-  'assets/lottiefiles/little_girl_jumping_-_loader.json',
-  'assets/lottiefiles/red_pocket_pop_up.json',
-  'assets/lottiefiles/star 2.json',
-  'assets/lottiefiles/playing.json',
-  'assets/lottiefiles/motorcycle.json',
-  'assets/lottiefiles/submit button.json',
-  'assets/lottiefiles/infinite_rainbow.json',
-  'assets/lottiefiles/print.json',
-  'assets/lottiefiles/powerupp_app_onboard.json',
-  'assets/lottiefiles/cycle_animation.json',
-  'assets/lottiefiles/vigilance_camera.json',
-  'assets/lottiefiles/code_invite_success.json',
-  'assets/lottiefiles/walking_arrow.json',
-  'assets/lottiefiles/pen_tool_loop.json',
-  'assets/lottiefiles/mnemonics.json',
-  'assets/lottiefiles/bootymovin.json',
-  'assets/lottiefiles/happy birthday.json',
-  'assets/lottiefiles/books.json',
-  'assets/lottiefiles/angel.zip',
-  'assets/lottiefiles/building_evolution_animation.json',
-  'assets/lottiefiles/edited-landscape.json',
-  'assets/lottiefiles/spinner loading.json',
-  'assets/lottiefiles/accept_arrows.json',
-  'assets/lottiefiles/mindful.json',
-  'assets/lottiefiles/gaming_pad.json',
-  'assets/lottiefiles/menuButton2.json',
-  'assets/lottiefiles/wolf_peek.json',
-  'assets/lottiefiles/security_token_roundtable.zip',
-  'assets/lottiefiles/day_night_cycle.json',
-  'assets/lottiefiles/cancel_button.json',
-  'assets/lottiefiles/menu_button_alt.json',
-  'assets/lottiefiles/animated_graph.json',
-  'assets/lottiefiles/point.json',
-  'assets/lottiefiles/search_button.json',
-  'assets/lottiefiles/a_mountain.json',
-  'assets/lottiefiles/on_off_settings_switch.json',
+  'assets/lottiefiles/truecosmos.json',
+  'assets/lottiefiles/turbine.json',
   'assets/lottiefiles/typing dot.json',
-  'assets/lottiefiles/kod.io_logo_reveal.json',
-  'assets/lottiefiles/___.json',
-  'assets/lottiefiles/animated_laptop_.json',
-  'assets/lottiefiles/simple_loader.json',
-  'assets/lottiefiles/personal_character.json',
-  'assets/lottiefiles/check_pop.json',
-  'assets/lottiefiles/xuanwheel_logo.json',
-  'assets/lottiefiles/lightsaber.json',
-  'assets/lottiefiles/peli-canon.json',
-  'assets/lottiefiles/map_animation.json',
-  'assets/lottiefiles/funky_chicken.json',
-  'assets/lottiefiles/ball_&_map.zip',
-  'assets/lottiefiles/snowcation.json',
-  'assets/lottiefiles/estimate.json',
-  'assets/lottiefiles/delivery_van.json',
-  'assets/lottiefiles/spacehub.json',
-  'assets/lottiefiles/material loading.json',
-  'assets/lottiefiles/swipe_right_indicator.json',
-  'assets/lottiefiles/pagination.json',
-  'assets/lottiefiles/confusion.json',
-  'assets/lottiefiles/coinfall.json',
-  'assets/lottiefiles/fabulous_onboarding_animation.json',
-  'assets/lottiefiles/win_result_2.json',
-  'assets/lottiefiles/scan.json',
-  'assets/lottiefiles/la_calavera.json',
-  'assets/lottiefiles/drop.json',
-  'assets/lottiefiles/scan_qr_code_success.json',
-  'assets/lottiefiles/loading_semicircle.json',
-  'assets/lottiefiles/immiguide_.json',
-  'assets/lottiefiles/vr_sickness.json',
-  'assets/lottiefiles/cash.json',
-  'assets/lottiefiles/ph_onboarding_.json',
+  'assets/lottiefiles/uk.json',
+  'assets/lottiefiles/updating_map.json',
+  'assets/lottiefiles/us.json',
   'assets/lottiefiles/video_cam.json',
-  'assets/lottiefiles/material_loader.json',
-  'assets/lottiefiles/toggle.json',
-  'assets/lottiefiles/browser.json',
-  'assets/lottiefiles/day_of_the_dead.json',
-  'assets/lottiefiles/cube_loader.json',
-  'assets/lottiefiles/washing_machine.json',
+  'assets/lottiefiles/vigilance_camera.json',
+  'assets/lottiefiles/volume_indicator.json',
+  'assets/lottiefiles/volume_shake_indicator.json',
+  'assets/lottiefiles/vr_animation.json',
+  'assets/lottiefiles/vr_sickness.json',
+  'assets/lottiefiles/walking.json',
+  'assets/lottiefiles/walking_arrow.json',
   'assets/lottiefiles/wallet recharge.json',
-  'assets/lottiefiles/pencil_write.json',
-  'assets/lottiefiles/progress_bar.json',
-  'assets/lottiefiles/iphone_x_loading.json',
-  'assets/lottiefiles/bomb.json',
-  'assets/lottiefiles/swipe_menu.json',
-  'assets/lottiefiles/trail_loading.json',
-  'assets/lottiefiles/StreetByMorning.json',
-  'assets/lottiefiles/cooking_app.json',
-  'assets/lottiefiles/lottiepreview_qr.json',
-  'assets/lottiefiles/touch_id.json',
-  'assets/lf20_w2Afea.json',
+  'assets/lottiefiles/washing_machine.json',
+  'assets/lottiefiles/win_result_2.json',
+  'assets/lottiefiles/wolf_peek.json',
+  'assets/lottiefiles/x_pop.json',
+  'assets/lottiefiles/xamarin_logo_2.json',
+  'assets/lottiefiles/xuanwheel_logo.json',
+  'assets/lottiefiles/yoga_carpet.json',
+  'assets/lottiefiles/youtube_icon_reveal.json',
 ];

example/lib/src/web_files.dart

@@ -0,0 +1,11 @@
+final files = [
+  'assets/lottiefiles/cubo_livre.json',
+  'assets/lottiefiles/slack_app_loader.json',
+  'assets/lottiefiles/walking.json',
+  'assets/lottiefiles/jojo_the_bird.json',
+  'assets/lottiefiles/bitcoin_to_the_moon.json',
+  'assets/lottiefiles/splashy_loader.json',
+  'assets/lottiefiles/uk.json',
+  'assets/lottiefiles/yoga_carpet.json',
+  'assets/lottiefiles/books.json',
+];

example/macos/Runner/Configs/AppInfo.xcconfig

@@ -8,7 +8,7 @@
 PRODUCT_NAME = example
 
 // The application's bundle identifier
-PRODUCT_BUNDLE_IDENTIFIER = com.example.example
+PRODUCT_BUNDLE_IDENTIFIER = com.github.xvrh.lottie.sample
 
 // The copyright displayed in application information
 PRODUCT_COPYRIGHT = Copyright © 2020 com.example. All rights reserved.

example/pubspec.lock

@@ -29,6 +29,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.5"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.5.0"
   charcode:
     dependency: transitive
     description:
@@ -62,11 +69,25 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_colorpicker:
+    dependency: "direct main"
+    description:
+      name: flutter_colorpicker
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.2"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  golden_toolkit:
+    dependency: "direct dev"
+    description:
+      name: golden_toolkit
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.1"
   image:
     dependency: transitive
     description:
@@ -87,7 +108,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.2.0+1"
+    version: "0.3.1"
   matcher:
     dependency: transitive
     description:
@@ -176,7 +197,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.11"
+    version: "0.2.15"
   typed_data:
     dependency: transitive
     description:
@@ -200,3 +221,4 @@ packages:
     version: "3.5.0"
 sdks:
   dart: ">=2.7.0 <3.0.0"
+  flutter: ">=1.5.4 <2.0.0"

example/pubspec.yaml

@@ -10,10 +10,12 @@ dependencies:
     sdk: flutter
   lottie:
     path: ../
+  flutter_colorpicker:
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  golden_toolkit:
 
 dependency_overrides:
   pedantic: ^1.9.0
@@ -34,33 +36,25 @@ flutter:
     - assets/Images/
     - assets/Images/WeAccept/
 
-  # To add assets to your package, add an assets section, like this:
-  # assets:
-  #  - images/a_dot_burr.jpeg
-  #  - images/a_dot_ham.jpeg
-  #
-  # For details regarding assets in packages, see
-  # https://flutter.dev/assets-and-images/#from-packages
-  #
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # To add custom fonts to your package, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts in packages, see
-  # https://flutter.dev/custom-fonts/#from-packages
+  fonts:
+    - family: Comic Neue
+      fonts:
+        - asset: assets/fonts/Comic-Neue.ttf
+    - family: Helvetica
+      fonts:
+        - asset: assets/fonts/Helvetica.ttf
+    - family: Helvetica Neue
+      fonts:
+        - asset: assets/fonts/Helvetica-Neue.ttf
+    - family: Open Sans
+      fonts:
+        - asset: assets/fonts/Open-Sans.ttf
+    - family: PT Serif
+      fonts:
+        - asset: assets/fonts/PT-Serif.ttf
+    - family: Roboto
+      fonts:
+        - asset: assets/fonts/Roboto.ttf
+    - family: Noto Emoji
+      fonts:
+        - asset: assets/fonts/NotoEmoji-Regular.ttf

example/test/dynamic_properties_test.dart

@@ -0,0 +1,293 @@
+import 'dart:io';
+import 'dart:ui';
+import 'package:flutter/material.dart';
+import 'package:flutter/painting.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:lottie/lottie.dart';
+
+void main() {
+  LottieComposition composition;
+
+  setUpAll(() async {
+    composition = await LottieComposition.fromBytes(
+        File('assets/Tests/Shapes.json').readAsBytesSync());
+  });
+
+  void testGolden(String description, ValueDelegate delegate,
+      {double progress}) async {
+    var screenshotName = description
+        .toLowerCase()
+        .replaceAll(RegExp('[^a-z0-9 ]'), '')
+        .replaceAll(' ', '_');
+
+    testWidgets(description, (tester) async {
+      var animation =
+          AnimationController(vsync: tester, duration: composition.duration);
+      if (progress != null) {
+        animation.value = progress;
+      }
+
+      await tester.pumpWidget(
+        Lottie(
+          composition: composition,
+          controller: animation,
+          delegates: LottieDelegates(values: [delegate]),
+        ),
+      );
+      await tester.pump();
+      await expectLater(find.byType(Lottie),
+          matchesGoldenFile('goldens/dynamic/$screenshotName.png'));
+
+      if (progress == null || progress == 0) {
+        await tester.pumpWidget(
+          Lottie(
+            composition: composition,
+            controller: animation,
+            delegates: LottieDelegates(values: []),
+          ),
+        );
+        await tester.pump();
+        await expectLater(find.byType(Lottie),
+            matchesGoldenFile('goldens/dynamic_without_delegate.png'));
+      }
+    });
+  }
+
+  testGolden(
+    'Fill color (Green)',
+    ValueDelegate.color(['Shape Layer 1', 'Rectangle', 'Fill 1'],
+        value: Colors.green),
+  );
+
+  testGolden(
+    'Fill color (Yellow)',
+    ValueDelegate.color(['Shape Layer 1', 'Rectangle', 'Fill 1'],
+        value: Colors.yellow),
+  );
+
+  testGolden(
+    'Fill opacity',
+    ValueDelegate.opacity(['Shape Layer 1', 'Rectangle', 'Fill 1'], value: 50),
+  );
+
+  testGolden(
+    'Stroke color',
+    ValueDelegate.strokeColor(['Shape Layer 1', 'Rectangle', 'Stroke 1'],
+        value: Colors.green),
+  );
+
+  testGolden(
+    'Stroke width',
+    ValueDelegate.strokeWidth(['Shape Layer 1', 'Rectangle', 'Stroke 1'],
+        value: 50),
+  );
+
+  testGolden(
+    'Stroke opacity',
+    ValueDelegate.opacity(['Shape Layer 1', 'Rectangle', 'Stroke 1'],
+        value: 50),
+  );
+
+  testGolden(
+    'Transform anchor point',
+    ValueDelegate.transformAnchorPoint(['Shape Layer 1', 'Rectangle'],
+        value: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Transform position',
+    ValueDelegate.transformPosition(['Shape Layer 1', 'Rectangle'],
+        value: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Transform position (relative)',
+    ValueDelegate.transformPosition(['Shape Layer 1', 'Rectangle'],
+        relative: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Transform opacity',
+    ValueDelegate.transformOpacity(['Shape Layer 1', 'Rectangle'], value: 50),
+  );
+
+  testGolden(
+    'Transform rotation',
+    ValueDelegate.transformRotation(['Shape Layer 1', 'Rectangle'], value: 45),
+  );
+
+  testGolden(
+    'Transform scale',
+    ValueDelegate.transformScale(['Shape Layer 1', 'Rectangle'],
+        value: Offset(0.5, 0.5)),
+  );
+
+  testGolden(
+    'Rectangle corner roundedness',
+    ValueDelegate.cornerRadius(
+        ['Shape Layer 1', 'Rectangle', 'Rectangle Path 1'],
+        value: 7),
+  );
+
+  testGolden(
+    'Rectangle position',
+    ValueDelegate.position(['Shape Layer 1', 'Rectangle', 'Rectangle Path 1'],
+        relative: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Rectangle size',
+    ValueDelegate.rectangleSize(
+        ['Shape Layer 1', 'Rectangle', 'Rectangle Path 1'],
+        relative: Offset(30, 40)),
+  );
+
+  testGolden(
+    'Ellipse position',
+    ValueDelegate.position(['Shape Layer 1', 'Ellipse', 'Ellipse Path 1'],
+        relative: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Ellipse size',
+    ValueDelegate.ellipseSize(['Shape Layer 1', 'Ellipse', 'Ellipse Path 1'],
+        relative: Offset(40, 60)),
+  );
+
+  testGolden(
+    'Star points',
+    ValueDelegate.polystarPoints(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 8),
+  );
+
+  testGolden(
+    'Star rotation',
+    ValueDelegate.polystarRotation(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 10),
+  );
+
+  testGolden(
+    'Star position',
+    ValueDelegate.position(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        relative: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Star inner radius',
+    ValueDelegate.polystarInnerRadius(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 10),
+  );
+
+  testGolden(
+    'Star inner roundedness',
+    ValueDelegate.polystarInnerRoundedness(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 100),
+  );
+
+  testGolden(
+    'Star outer radius',
+    ValueDelegate.polystarOuterRadius(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 60),
+  );
+
+  testGolden(
+    'Star outer roundedness',
+    ValueDelegate.polystarOuterRoundedness(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 100),
+  );
+
+  testGolden(
+    'Polygon points',
+    ValueDelegate.polystarPoints(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 8),
+  );
+
+  testGolden(
+    'Polygon rotation',
+    ValueDelegate.polystarRotation(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 10),
+  );
+
+  testGolden(
+    'Polygon position',
+    ValueDelegate.position(['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        relative: Offset(20, 20)),
+  );
+
+  testGolden(
+    'Polygon radius',
+    ValueDelegate.polystarOuterRadius(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        relative: 60),
+  );
+
+  testGolden(
+    'Polygon roundedness',
+    ValueDelegate.polystarOuterRoundedness(
+        ['Shape Layer 1', 'Star', 'Polystar Path 1'],
+        value: 100),
+  );
+
+  testGolden(
+    'Repeater transform position',
+    ValueDelegate.transformPosition(
+        ['Shape Layer 1', 'Repeater Shape', 'Repeater 1'],
+        relative: Offset(100, 100)),
+  );
+
+  testGolden(
+    'Repeater transform start opacity',
+    ValueDelegate.transformStartOpacity(
+        ['Shape Layer 1', 'Repeater Shape', 'Repeater 1'],
+        value: 25),
+  );
+
+  testGolden(
+    'Repeater transform end opacity',
+    ValueDelegate.transformEndOpacity(
+        ['Shape Layer 1', 'Repeater Shape', 'Repeater 1'],
+        value: 25),
+  );
+
+  testGolden(
+    'Repeater transform rotation',
+    ValueDelegate.transformRotation(
+        ['Shape Layer 1', 'Repeater Shape', 'Repeater 1'],
+        value: 45),
+  );
+
+  testGolden(
+    'Repeater transform scale',
+    ValueDelegate.transformScale(
+        ['Shape Layer 1', 'Repeater Shape', 'Repeater 1'],
+        value: Offset(2, 2)),
+  );
+
+  testGolden('Time remapping', ValueDelegate.timeRemap(['Circle 1'], value: 1),
+      progress: 0.1);
+
+  testGolden(
+    'Color Filter',
+    ValueDelegate.colorFilter(['**'],
+        value: ColorFilter.mode(Colors.green, BlendMode.srcATop)),
+  );
+
+  testGolden(
+    'Null Color Filter',
+    ValueDelegate.colorFilter(['**'], value: null),
+  );
+
+  for (var progress in [0.0, 0.5, 1.0]) {
+    testGolden(
+        'Opacity interpolation ($progress)',
+        ValueDelegate.transformOpacity(['Shape Layer 1', 'Rectangle'],
+            callback: (frameInfo) => lerpDouble(
+                    10, 100, Curves.linear.transform(frameInfo.overallProgress))
+                .round()),
+        progress: progress);
+  }
+}

example/test/dynamic_text_test.dart

@@ -0,0 +1,29 @@
+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

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

example/test/gradient_test.dart

@@ -0,0 +1,58 @@
+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() {
+  void testGradient(String name, ValueDelegate valueDelegate) {
+    testWidgets(name, (tester) async {
+      var composition = await LottieComposition.fromBytes(
+          File('assets/Tests/DynamicGradient.json').readAsBytesSync());
+
+      var animation =
+          AnimationController(vsync: tester, duration: composition.duration);
+
+      await tester.pumpWidget(
+        Lottie(
+          composition: composition,
+          controller: animation,
+          delegates: LottieDelegates(values: [valueDelegate]),
+        ),
+      );
+
+      var screenshotName = name
+          .toLowerCase()
+          .replaceAll(RegExp('[^a-z0-9 ]'), '')
+          .replaceAll(' ', '_');
+
+      await expectLater(find.byType(Lottie),
+          matchesGoldenFile('goldens/gradients/$screenshotName.png'));
+    });
+  }
+
+  testGradient(
+      'Linear Gradient Fill',
+      ValueDelegate.gradientColor(['Linear', 'Rectangle', 'Gradient Fill'],
+          value: [Color(0xFFFFFF00), Color(0xFF00FF00)]));
+
+  testGradient(
+      'Radial Gradient Fill',
+      ValueDelegate.gradientColor(['Radial', 'Rectangle', 'Gradient Fill'],
+          value: [Color(0xFFFFFF00), Color(0xFF00FF00)]));
+
+  testGradient(
+      'Linear Gradient Stroke',
+      ValueDelegate.gradientColor(['Linear', 'Rectangle', 'Gradient Stroke'],
+          value: [Color(0xFFFFFF00), Color(0xFF00FF00)]));
+
+  testGradient(
+      'Radial Gradient Stroke',
+      ValueDelegate.gradientColor(['Radial', 'Rectangle', 'Gradient Stroke'],
+          value: [Color(0xFFFFFF00), Color(0xFF00FF00)]));
+
+  testGradient(
+      'Opacity Linear Gradient Fill',
+      ValueDelegate.opacity(['Linear', 'Rectangle', 'Gradient Fill'],
+          value: 50));
+}

example/test/stroke_test.dart

@@ -0,0 +1,37 @@
+import 'dart:io';
+import 'dart:ui';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:lottie/lottie.dart';
+import 'package:path/path.dart' as p;
+import 'utils.dart';
+
+void main() {
+  testWidgets('Animations with stroke', (tester) async {
+    var size = Size(500, 400);
+    tester.binding.window.physicalSizeTestValue = size;
+    tester.binding.window.devicePixelRatioTestValue = 1.0;
+
+    for (var asset in [
+      'assets/Tests/Stroke.json',
+      'assets/lottiefiles/loading_disc.json',
+      'assets/Mobilo/G.json',
+      'assets/lottiefiles/truecosmos.json',
+      'assets/lottiefiles/intelia_logo_animation.json',
+      'assets/lottiefiles/landing_page.json',
+      'assets/lottiefiles/permission.json',
+      'assets/lottiefiles/little_girl_jumping_-_loader.json',
+      'assets/lottiefiles/playing.json',
+      'assets/lottiefiles/win_result_2.json',
+    ]) {
+      var composition =
+          await LottieComposition.fromBytes(File(asset).readAsBytesSync());
+
+      await tester.pumpWidget(FilmStrip(composition, size: size));
+
+      var fileName = '${p.basenameWithoutExtension(asset)}.png'.toLowerCase();
+      await expectLater(find.byType(FilmStrip),
+          matchesGoldenFile(p.join('goldens/strokes', fileName)));
+    }
+  });
+}

example/test/utils.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+class FilmStrip extends StatelessWidget {
+  final LottieComposition composition;
+  final Size size;
+
+  const FilmStrip(this.composition, {Key key, @required this.size})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(
+      size: size,
+      painter: _CustomerPainter(composition),
+    );
+  }
+}
+
+class _CustomerPainter extends CustomPainter {
+  static const _columns = 5;
+  final LottieComposition composition;
+
+  _CustomerPainter(this.composition);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    var thumbSize = Size(size.width / _columns, size.width / _columns);
+    var drawable = LottieDrawable(composition);
+
+    var index = 0;
+    for (var progress = 0.0; progress <= 1; progress += 0.05) {
+      var x = index % _columns;
+      var y = index ~/ _columns;
+
+      var rect = Offset(x * thumbSize.width, y.toDouble() * thumbSize.height) &
+          thumbSize;
+
+      drawable
+        ..setProgress(progress)
+        ..draw(canvas, rect);
+
+      ++index;
+    }
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) {
+    return true;
+  }
+}