snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

animations/.gitignore

@@ -0,0 +1,73 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

animations/.metadata

@@ -0,0 +1,45 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "db7ef5bf9f59442b0e200a90587e8fa5e0c6336a"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: android
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: ios
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: linux
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: macos
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: web
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: windows
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

animations/README.md

@@ -0,0 +1,56 @@
+# Animation Samples
+Sample apps that showcase Flutter's animation features
+
+## Goals
+
+- Demonstrate the building blocks for animations and how they work together.
+- Provide samples for common patterns and use-cases.
+
+## Samples
+
+### Basics
+
+Building blocks and patterns
+
+1. **AnimatedContainerDemo**: Demonstrates how to use `AnimatedContainer`.
+2. **PageRouteBuilderDemo**: Demonstrates how to use `Tween` and `Animation` to
+   build a custom page route transition.
+3. **AnimationControllerDemo**: Demonstrates how to use an
+   `AnimationController`.
+4. **TweenDemo**: Demonstrates how to use a `Tween` with an
+   `AnimationController`.
+5. **AnimatedBuilderDemo**: Demonstrates how to use an `AnimatedBuilder` with an
+   `AnimationController`.
+6. **CustomTweenDemo**: Demonstrates how to extend `Tween`.
+7. **TweenSequenceDemo**: Demonstrates how to use `TweenSequence` to build a
+   button that changes between different colors.
+8. **FadeTransitionDemo**: Demonstrates how to use `FadeTransition`.
+
+### Misc
+
+Other uses-cases and examples
+
+- **RepeatingAnimationDemo**: Demonstrates how to repeat an animation.
+- **ExpandCardDemo**: Demonstrates how to use `AnimatedCrossFade` to fade
+  between two widgets and change the size.
+- **CarouselDemo**: Demonstrates how to use `PageView` with a custom animation.
+- **FocusImageDemo**: Demonstrates how to measure the size of a widget and
+  expand it using a `PageRouteBuilder`.
+- **PhysicsCardDragDemo**: Demonstrates how to run an AnimationController with a
+  spring simulation.
+- **CardSwipeDemo**: A swipeable card that demonstrates how to use gesture
+  detection to drive an animation.
+- **AnimatedList**: Demonstrates how to use `AnimatedList`.
+- **AnimatedPositionedDemo**: Demonstrates how to use `AnimatedPositioned`.
+- **AnimatedSwitcherDemo**: Demonstrates how to use `AnimatedSwitcher`.
+- **HeroAnimationDemo**: Demonstrates how to use `Hero` animation.
+- **CurvedAnimationDemo**: Demonstrates how to use different curves in
+  `CurvedAnimation`.
+
+## Other Resources
+
+- [Introduction to animations](https://flutter.dev/docs/development/ui/animations)
+- [Animation widgets](https://flutter.dev/docs/development/ui/widgets/animation)
+- [Flutter cookbook - Animations](https://flutter.dev/docs/cookbook/animation)
+- [Animations tutorial](https://flutter.dev/docs/development/ui/animations/tutorial)
+- [Implicit animation codelab](https://flutter.dev/docs/codelabs/implicit-animations)

animations/analysis_options.yaml

@@ -0,0 +1 @@
+include: ../analysis_options.yaml

animations/android/.gitignore

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

animations/android/app/build.gradle

@@ -0,0 +1,67 @@
+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+android {
+    namespace "dev.flutter.animations"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "dev.flutter.animations"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {}

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

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

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

@@ -0,0 +1,33 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="animations"
+        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"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

animations/android/app/src/main/kotlin/dev/flutter/animations/MainActivity.kt

@@ -0,0 +1,6 @@
+package dev.flutter.animations
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

animations/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>

animations/android/app/src/main/res/drawable/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:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

animations/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
+             the Flutter engine 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>

animations/android/app/src/main/res/values/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 off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine 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>

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

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

animations/android/build.gradle

@@ -0,0 +1,30 @@
+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+tasks.register("clean", Delete) {
+    delete rootProject.buildDir
+}

animations/android/gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx4G
+android.useAndroidX=true
+android.enableJetifier=true

animations/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

animations/android/settings.gradle

@@ -0,0 +1,29 @@
+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }
+    settings.ext.flutterSdkPath = flutterSdkPath()
+
+    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+
+    plugins {
+        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
+    }
+}
+
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.3.0" apply false
+}
+
+include ":app"

animations/codelab_rebuild.yaml

@@ -0,0 +1,13 @@
+# Run with tooling from https://github.com/flutter/codelabs/tree/main/tooling/codelab_rebuild
+name: Animations rebuild script
+steps:
+  - name: Remove runners
+    rmdirs: 
+      - android
+      - ios
+      - linux
+      - macos
+      - web
+      - windows
+  - name: Flutter recreate
+    flutter: create --org dev.flutter .

animations/fonts/LICENSE.txt

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

animations/ios/.gitignore

@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

animations/ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,26 @@
+<?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>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>11.0</string>
+</dict>
+</plist>

animations/ios/Flutter/Debug.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"

animations/ios/Flutter/Release.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"

animations/ios/Podfile

@@ -0,0 +1,44 @@
+# Uncomment this line to define a global platform for your project
+# platform :ios, '11.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', '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
+
+  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 Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+  target 'RunnerTests' do
+    inherit! :search_paths
+  end
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

animations/ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,614 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 54;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
+		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+		331C808B294A63AB00263BE5 /* RunnerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 331C807B294A618700263BE5 /* RunnerTests.swift */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXContainerItemProxy section */
+		331C8085294A63A400263BE5 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 97C146E61CF9000F007C117D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 97C146ED1CF9000F007C117D;
+			remoteInfo = Runner;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
+		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
+		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
+		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
+		97C146EE1CF9000F007C117D /* Runner.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Runner.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		97C146FB1CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		331C807B294A618700263BE5 /* RunnerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RunnerTests.swift; sourceTree = "<group>"; };
+		331C8081294A63A400263BE5 /* RunnerTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = RunnerTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		97C146EB1CF9000F007C117D /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		9740EEB11CF90186004384FC /* Flutter */ = {
+			isa = PBXGroup;
+			children = (
+				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
+				9740EEB21CF90195004384FC /* Debug.xcconfig */,
+				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
+				9740EEB31CF90195004384FC /* Generated.xcconfig */,
+			);
+			name = Flutter;
+			sourceTree = "<group>";
+		};
+		331C8082294A63A400263BE5 /* RunnerTests */ = {
+			isa = PBXGroup;
+			children = (
+				331C807B294A618700263BE5 /* RunnerTests.swift */,
+			);
+			path = RunnerTests;
+			sourceTree = "<group>";
+		};
+		97C146E51CF9000F007C117D = {
+			isa = PBXGroup;
+			children = (
+				9740EEB11CF90186004384FC /* Flutter */,
+				97C146F01CF9000F007C117D /* Runner */,
+				97C146EF1CF9000F007C117D /* Products */,
+				331C8082294A63A400263BE5 /* RunnerTests */,
+			);
+			sourceTree = "<group>";
+		};
+		97C146EF1CF9000F007C117D /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				97C146EE1CF9000F007C117D /* Runner.app */,
+				331C8081294A63A400263BE5 /* RunnerTests.xctest */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		97C146F01CF9000F007C117D /* Runner */ = {
+			isa = PBXGroup;
+			children = (
+				97C146FA1CF9000F007C117D /* Main.storyboard */,
+				97C146FD1CF9000F007C117D /* Assets.xcassets */,
+				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
+				97C147021CF9000F007C117D /* Info.plist */,
+				1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */,
+				1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */,
+				74858FAE1ED2DC5600515810 /* AppDelegate.swift */,
+				74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */,
+			);
+			path = Runner;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		331C8080294A63A400263BE5 /* RunnerTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */;
+			buildPhases = (
+				331C807D294A63A400263BE5 /* Sources */,
+				331C807E294A63A400263BE5 /* Frameworks */,
+				331C807F294A63A400263BE5 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				331C8086294A63A400263BE5 /* PBXTargetDependency */,
+			);
+			name = RunnerTests;
+			productName = RunnerTests;
+			productReference = 331C8081294A63A400263BE5 /* RunnerTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
+		97C146ED1CF9000F007C117D /* Runner */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
+			buildPhases = (
+				9740EEB61CF901F6004384FC /* Run Script */,
+				97C146EA1CF9000F007C117D /* Sources */,
+				97C146EB1CF9000F007C117D /* Frameworks */,
+				97C146EC1CF9000F007C117D /* Resources */,
+				9705A1C41CF9048500538489 /* Embed Frameworks */,
+				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Runner;
+			productName = Runner;
+			productReference = 97C146EE1CF9000F007C117D /* Runner.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		97C146E61CF9000F007C117D /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = YES;
+				LastUpgradeCheck = 1430;
+				ORGANIZATIONNAME = "";
+				TargetAttributes = {
+					331C8080294A63A400263BE5 = {
+						CreatedOnToolsVersion = 14.0;
+						TestTargetID = 97C146ED1CF9000F007C117D;
+					};
+					97C146ED1CF9000F007C117D = {
+						CreatedOnToolsVersion = 7.3.1;
+						LastSwiftMigration = 1100;
+					};
+				};
+			};
+			buildConfigurationList = 97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */;
+			compatibilityVersion = "Xcode 9.3";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 97C146E51CF9000F007C117D;
+			productRefGroup = 97C146EF1CF9000F007C117D /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				97C146ED1CF9000F007C117D /* Runner */,
+				331C8080294A63A400263BE5 /* RunnerTests */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		331C807F294A63A400263BE5 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		97C146EC1CF9000F007C117D /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
+				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
+				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
+				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXShellScriptBuildPhase section */
+		3B06AD1E1E4923F5004D2608 /* Thin Binary */ = {
+			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${TARGET_BUILD_DIR}/${INFOPLIST_PATH}",
+			);
+			name = "Thin Binary";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
+		};
+		9740EEB61CF901F6004384FC /* Run Script */ = {
+			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Run Script";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
+		};
+/* End PBXShellScriptBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		331C807D294A63A400263BE5 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				331C808B294A63AB00263BE5 /* RunnerTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		97C146EA1CF9000F007C117D /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
+				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXTargetDependency section */
+		331C8086294A63A400263BE5 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 97C146ED1CF9000F007C117D /* Runner */;
+			targetProxy = 331C8085294A63A400263BE5 /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
+/* Begin PBXVariantGroup section */
+		97C146FA1CF9000F007C117D /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				97C146FB1CF9000F007C117D /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+		97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				97C147001CF9000F007C117D /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		249021D3217E4FDB00AE95B9 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				SUPPORTED_PLATFORMS = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Profile;
+		};
+		249021D4217E4FDB00AE95B9 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Profile;
+		};
+		331C8088294A63A400263BE5 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = AE0B7B92F70575B8D7E0D07E /* Pods-RunnerTests.debug.xcconfig */;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Debug;
+		};
+		331C8089294A63A400263BE5 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 89B67EB44CE7B6631473024E /* Pods-RunnerTests.release.xcconfig */;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Release;
+		};
+		331C808A294A63A400263BE5 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 640959BDD8F10B91D80A66BE /* Pods-RunnerTests.profile.xcconfig */;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Profile;
+		};
+		97C147031CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		97C147041CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				SUPPORTED_PLATFORMS = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		97C147061CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.animations;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				331C8088294A63A400263BE5 /* Debug */,
+				331C8089294A63A400263BE5 /* Release */,
+				331C808A294A63A400263BE5 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

animations/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

animations/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>

animations/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>

animations/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1430"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

animations/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

animations/ios/Runner.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>

animations/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>

animations/ios/Runner/AppDelegate.swift

@@ -0,0 +1,13 @@
+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

animations/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

animations/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

animations/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

animations/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

animations/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

animations/ios/Runner/Info.plist

@@ -0,0 +1,49 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Animations</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>animations</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+</dict>
+</plist>

animations/ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

animations/ios/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}

animations/lib/main.dart

@@ -0,0 +1,201 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+import 'src/basics/basics.dart';
+import 'src/misc/misc.dart';
+
+void main() {
+  runApp(const AnimationSamples());
+}
+
+class Demo {
+  final String name;
+  final String route;
+  final WidgetBuilder builder;
+
+  const Demo({
+    required this.name,
+    required this.route,
+    required this.builder,
+  });
+}
+
+final basicDemos = [
+  Demo(
+    name: 'AnimatedContainer',
+    route: AnimatedContainerDemo.routeName,
+    builder: (context) => const AnimatedContainerDemo(),
+  ),
+  Demo(
+    name: 'PageRouteBuilder',
+    route: PageRouteBuilderDemo.routeName,
+    builder: (context) => const PageRouteBuilderDemo(),
+  ),
+  Demo(
+    name: 'Animation Controller',
+    route: AnimationControllerDemo.routeName,
+    builder: (context) => const AnimationControllerDemo(),
+  ),
+  Demo(
+    name: 'Tweens',
+    route: TweenDemo.routeName,
+    builder: (context) => const TweenDemo(),
+  ),
+  Demo(
+    name: 'AnimatedBuilder',
+    route: AnimatedBuilderDemo.routeName,
+    builder: (context) => const AnimatedBuilderDemo(),
+  ),
+  Demo(
+    name: 'Custom Tween',
+    route: CustomTweenDemo.routeName,
+    builder: (context) => const CustomTweenDemo(),
+  ),
+  Demo(
+    name: 'Tween Sequences',
+    route: TweenSequenceDemo.routeName,
+    builder: (context) => const TweenSequenceDemo(),
+  ),
+  Demo(
+    name: 'Fade Transition',
+    route: FadeTransitionDemo.routeName,
+    builder: (context) => const FadeTransitionDemo(),
+  ),
+];
+
+final miscDemos = [
+  Demo(
+    name: 'Expandable Card',
+    route: ExpandCardDemo.routeName,
+    builder: (context) => const ExpandCardDemo(),
+  ),
+  Demo(
+    name: 'Carousel',
+    route: CarouselDemo.routeName,
+    builder: (context) => CarouselDemo(),
+  ),
+  Demo(
+    name: 'Focus Image',
+    route: FocusImageDemo.routeName,
+    builder: (context) => const FocusImageDemo(),
+  ),
+  Demo(
+    name: 'Card Swipe',
+    route: CardSwipeDemo.routeName,
+    builder: (context) => const CardSwipeDemo(),
+  ),
+  Demo(
+    name: 'Flutter Animate',
+    route: FlutterAnimateDemo.routeName,
+    builder: (context) => const FlutterAnimateDemo(),
+  ),
+  Demo(
+    name: 'Repeating Animation',
+    route: RepeatingAnimationDemo.routeName,
+    builder: (context) => const RepeatingAnimationDemo(),
+  ),
+  Demo(
+    name: 'Spring Physics',
+    route: PhysicsCardDragDemo.routeName,
+    builder: (context) => const PhysicsCardDragDemo(),
+  ),
+  Demo(
+    name: 'AnimatedList',
+    route: AnimatedListDemo.routeName,
+    builder: (context) => const AnimatedListDemo(),
+  ),
+  Demo(
+    name: 'AnimatedPositioned',
+    route: AnimatedPositionedDemo.routeName,
+    builder: (context) => const AnimatedPositionedDemo(),
+  ),
+  Demo(
+    name: 'AnimatedSwitcher',
+    route: AnimatedSwitcherDemo.routeName,
+    builder: (context) => const AnimatedSwitcherDemo(),
+  ),
+  Demo(
+    name: 'Hero Animation',
+    route: HeroAnimationDemo.routeName,
+    builder: (context) => const HeroAnimationDemo(),
+  ),
+  Demo(
+    name: 'Curved Animation',
+    route: CurvedAnimationDemo.routeName,
+    builder: (context) => const CurvedAnimationDemo(),
+  ),
+];
+
+final router = GoRouter(
+  routes: [
+    GoRoute(
+      path: '/',
+      builder: (context, state) => const HomePage(),
+      routes: [
+        for (final demo in basicDemos)
+          GoRoute(
+            path: demo.route,
+            builder: (context, state) => demo.builder(context),
+          ),
+        for (final demo in miscDemos)
+          GoRoute(
+            path: demo.route,
+            builder: (context, state) => demo.builder(context),
+          ),
+      ],
+    ),
+  ],
+);
+
+class AnimationSamples extends StatelessWidget {
+  const AnimationSamples({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp.router(
+      title: 'Animation Samples',
+      theme: ThemeData(colorSchemeSeed: Colors.deepPurple),
+      routerConfig: router,
+    );
+  }
+}
+
+class HomePage extends StatelessWidget {
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final headerStyle = Theme.of(context).textTheme.titleLarge;
+    return Scaffold(
+      appBar: AppBar(title: const Text('Animation Samples')),
+      body: ListView(
+        children: [
+          ListTile(title: Text('Basics', style: headerStyle)),
+          ...basicDemos.map((d) => DemoTile(demo: d)),
+          ListTile(title: Text('Misc', style: headerStyle)),
+          ...miscDemos.map((d) => DemoTile(demo: d)),
+        ],
+      ),
+    );
+  }
+}
+
+class DemoTile extends StatelessWidget {
+  final Demo demo;
+
+  const DemoTile({required this.demo, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(demo.name),
+      onTap: () {
+        context.go('/${demo.route}');
+      },
+    );
+  }
+}

animations/lib/src/basics/animated_builder.dart

@@ -0,0 +1,78 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class AnimatedBuilderDemo extends StatefulWidget {
+  const AnimatedBuilderDemo({super.key});
+  static const String routeName = 'basics/animated_builder';
+
+  @override
+  State<AnimatedBuilderDemo> createState() => _AnimatedBuilderDemoState();
+}
+
+class _AnimatedBuilderDemoState extends State<AnimatedBuilderDemo>
+    with SingleTickerProviderStateMixin {
+  static const Color beginColor = Colors.deepPurple;
+  static const Color endColor = Colors.deepOrange;
+  Duration duration = const Duration(milliseconds: 800);
+  late AnimationController controller;
+  late Animation<Color?> animation;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = AnimationController(vsync: this, duration: duration);
+    animation = ColorTween(
+      begin: beginColor,
+      end: endColor,
+    ).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('AnimatedBuilder')),
+      body: Center(
+        // AnimatedBuilder handles listening to a given animation and calling the builder
+        // whenever the value of the animation change. This can be useful when a Widget
+        // tree contains some animated and non-animated elements, as only the subtree
+        // created by the builder needs to be re-built when the animation changes.
+        child: AnimatedBuilder(
+          animation: animation,
+          builder: (context, child) {
+            return ElevatedButton(
+              style: ElevatedButton.styleFrom(
+                backgroundColor: animation.value,
+              ),
+              child: child,
+              onPressed: () {
+                switch (controller.status) {
+                  case AnimationStatus.completed:
+                    controller.reverse();
+                  default:
+                    controller.forward();
+                }
+              },
+            );
+          },
+          // AnimatedBuilder can also accept a pre-built child Widget which is useful
+          // if there is a non-animated Widget contained within the animated widget.
+          // This can improve performance since this widget doesn't need to be rebuilt
+          // when the animation changes.
+          child: const Text(
+            'Change Color',
+            style: TextStyle(color: Colors.white),
+          ),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/animated_container.dart

@@ -0,0 +1,80 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+
+double generateBorderRadius() => Random().nextDouble() * 64;
+double generateMargin() => Random().nextDouble() * 64;
+Color generateColor() => Color(0xFFFFFFFF & Random().nextInt(0xFFFFFFFF));
+
+class AnimatedContainerDemo extends StatefulWidget {
+  const AnimatedContainerDemo({super.key});
+  static String routeName = 'basics/animated_container';
+
+  @override
+  State<AnimatedContainerDemo> createState() => _AnimatedContainerDemoState();
+}
+
+class _AnimatedContainerDemoState extends State<AnimatedContainerDemo> {
+  late Color color;
+  late double borderRadius;
+  late double margin;
+
+  @override
+  void initState() {
+    super.initState();
+    color = Colors.deepPurple;
+    borderRadius = generateBorderRadius();
+    margin = generateMargin();
+  }
+
+  void change() {
+    setState(() {
+      color = generateColor();
+      borderRadius = generateBorderRadius();
+      margin = generateMargin();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This widget is built using an AnimatedContainer, one of the easiest to use
+    // animated Widgets. Whenever the AnimatedContainer's properties, such as decoration,
+    // change, it will handle animating from the previous value to the new value. You can
+    // specify both a Duration and a Curve for the animation.
+    // This Widget is useful for designing animated interfaces that just need to change
+    // the properties of a container. For example, you could use this to design expanding
+    // and shrinking cards.
+    return Scaffold(
+      appBar: AppBar(title: const Text('AnimatedContainer')),
+      body: Center(
+        child: Column(
+          children: [
+            Padding(
+              padding: const EdgeInsets.all(8.0),
+              child: SizedBox(
+                width: 128,
+                height: 128,
+                child: AnimatedContainer(
+                  margin: EdgeInsets.all(margin),
+                  decoration: BoxDecoration(
+                    color: color,
+                    borderRadius: BorderRadius.circular(borderRadius),
+                  ),
+                  duration: const Duration(milliseconds: 400),
+                ),
+              ),
+            ),
+            ElevatedButton(
+              child: const Text('change'),
+              onPressed: () => change(),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/animation_controller.dart

@@ -0,0 +1,86 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class AnimationControllerDemo extends StatefulWidget {
+  const AnimationControllerDemo({super.key});
+  static const String routeName = 'basics/animation_controller';
+
+  @override
+  State<AnimationControllerDemo> createState() =>
+      _AnimationControllerDemoState();
+}
+
+class _AnimationControllerDemoState extends State<AnimationControllerDemo>
+    with SingleTickerProviderStateMixin {
+  // Using the SingleTickerProviderStateMixin can ensure that our
+  // AnimationController only animates while the Widget is visible on the
+  // screen. This is a useful optimization that saves resources when the
+  // Widget is not visible.
+
+  static const Duration _duration = Duration(seconds: 1);
+  late final AnimationController controller;
+
+  @override
+  void initState() {
+    super.initState();
+
+    controller = AnimationController(vsync: this, duration: _duration)
+      // The Widget's build needs to be called every time the animation's
+      // value changes. So add a listener here that will call setState()
+      // and trigger the build() method to be called by the framework.
+      // If your Widget's build is relatively simple, this is a good option.
+      // However, if your build method returns a tree of child Widgets and
+      // most of them are not animated you should consider using
+      // AnimatedBuilder instead.
+      ..addListener(() {
+        setState(() {});
+      });
+  }
+
+  @override
+  void dispose() {
+    // AnimationController is a stateful resource that needs to be disposed when
+    // this State gets disposed.
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // When building the widget you can read the AnimationController's value property
+    // when building child widgets. You can also check the status to see if the animation
+    // has completed.
+    return Scaffold(
+      appBar: AppBar(title: const Text('Animation Controller')),
+      body: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ConstrainedBox(
+              constraints: const BoxConstraints(maxWidth: 200),
+              child: Text(
+                controller.value.toStringAsFixed(2),
+                style: Theme.of(context).textTheme.displaySmall,
+                textScaler: TextScaler.linear(1 + controller.value),
+              ),
+            ),
+            ElevatedButton(
+              child: const Text('animate'),
+              onPressed: () {
+                switch (controller.status) {
+                  case AnimationStatus.completed:
+                    controller.reverse();
+                  default:
+                    controller.forward();
+                }
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/basics.dart

@@ -0,0 +1,8 @@
+export 'animated_builder.dart';
+export 'animated_container.dart';
+export 'animation_controller.dart';
+export 'custom_tween.dart';
+export 'fade_transition.dart';
+export 'page_route_builder.dart';
+export 'tween_sequence.dart';
+export 'tweens.dart';

animations/lib/src/basics/custom_tween.dart

@@ -0,0 +1,123 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class TypewriterTween extends Tween<String> {
+  TypewriterTween({String begin = '', String end = ''})
+    : super(begin: begin, end: end);
+
+  @override
+  String lerp(double t) {
+    var cutoff = (end!.length * t).round();
+    return end!.substring(0, cutoff);
+  }
+}
+
+class CustomTweenDemo extends StatefulWidget {
+  const CustomTweenDemo({super.key});
+  static const String routeName = 'basics/custom_tweens';
+
+  @override
+  State<CustomTweenDemo> createState() => _CustomTweenDemoState();
+}
+
+class _CustomTweenDemoState extends State<CustomTweenDemo>
+    with SingleTickerProviderStateMixin {
+  static const Duration _duration = Duration(seconds: 3);
+  static const String message = loremIpsum;
+  late final AnimationController controller;
+  late final Animation<String> animation;
+
+  @override
+  void initState() {
+    super.initState();
+
+    controller = AnimationController(vsync: this, duration: _duration);
+    animation = TypewriterTween(end: message).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Custom Tween'),
+        actions: [
+          TextButton(
+            onPressed: () {
+              if (controller.status == AnimationStatus.completed) {
+                controller.reverse().whenComplete(() {
+                  setState(() {});
+                });
+              } else {
+                controller.forward().whenComplete(() {
+                  setState(() {});
+                });
+              }
+            },
+            child: Text(
+              controller.status == AnimationStatus.completed
+                  ? 'Delete Essay'
+                  : 'Write Essay',
+            ),
+          ),
+        ],
+      ),
+      body: SafeArea(
+        child: Container(
+          alignment: Alignment.bottomCenter,
+          child: SingleChildScrollView(
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.end,
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                Padding(
+                  padding: const EdgeInsets.all(8.0),
+                  child: Card(
+                    child: Container(
+                      padding: const EdgeInsets.all(8.0),
+                      child: AnimatedBuilder(
+                        animation: animation,
+                        builder: (context, child) {
+                          return Text(
+                            animation.value,
+                            style: const TextStyle(
+                              fontSize: 16,
+                              fontFamily: 'SpecialElite',
+                            ),
+                          );
+                        },
+                      ),
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+const String loremIpsum = '''
+Sed ut perspiciatis, unde omnis iste natus error sit voluptatem accusantium
+doloremque laudantium, totam rem aperiam eaque ipsa, quae ab illo inventore
+veritatis et quasi architecto beatae vitae dicta sunt, explicabo. Nemo enim
+ipsam voluptatem, quia voluptas sit, aspernatur aut odit aut fugit, sed quia
+consequuntur magni dolores eos, qui ratione voluptatem sequi nesciunt, neque
+porro quisquam est, qui dolorem ipsum, quia dolor sit amet consectetur
+adipisci[ng] velit, sed quia non-numquam [do] eius modi tempora inci[di]dunt, ut
+labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam,
+quis nostrum[d] exercitationem ullam corporis suscipit laboriosam, nisi ut
+aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit, qui in
+ea voluptate velit esse, quam nihil molestiae consequatur, vel illum, qui
+dolorem eum fugiat, quo voluptas nulla pariatur?
+''';

animations/lib/src/basics/fade_transition.dart

@@ -0,0 +1,73 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+// Refer to the AnimatedWidget docs here - https://api.flutter.dev/flutter/widgets/AnimatedWidget-class.html
+// for examples of other common animated widgets.
+class FadeTransitionDemo extends StatefulWidget {
+  const FadeTransitionDemo({super.key});
+  static const String routeName = 'basics/fade_transition';
+
+  @override
+  State<FadeTransitionDemo> createState() => _FadeTransitionDemoState();
+}
+
+class _FadeTransitionDemoState extends State<FadeTransitionDemo>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+  late final Animation<double> _animation;
+  late final CurvedAnimation _curve;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 500),
+    );
+
+    _curve = CurvedAnimation(parent: _controller, curve: Curves.easeIn);
+
+    _animation = Tween(begin: 1.0, end: 0.0).animate(_curve);
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Fade Transition')),
+      body: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            FadeTransition(
+              opacity: _animation,
+              child: const Icon(
+                Icons.star,
+                color: Colors.amber,
+                size: 300,
+              ),
+            ),
+            ElevatedButton(
+              child: const Text('animate'),
+              onPressed: () => setState(() {
+                _controller
+                    .animateTo(1.0)
+                    .then<TickerFuture>(
+                      (value) => _controller.animateBack(0.0),
+                    );
+              }),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/page_route_builder.dart

@@ -0,0 +1,58 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class PageRouteBuilderDemo extends StatelessWidget {
+  const PageRouteBuilderDemo({super.key});
+  static const String routeName = 'basics/page_route_builder';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Page 1')),
+      body: Center(
+        child: ElevatedButton(
+          child: const Text('Go!'),
+          onPressed: () {
+            Navigator.of(context).push<void>(_createRoute());
+          },
+        ),
+      ),
+    );
+  }
+}
+
+Route _createRoute() {
+  return PageRouteBuilder<SlideTransition>(
+    pageBuilder: (context, animation, secondaryAnimation) => _Page2(),
+    transitionsBuilder: (context, animation, secondaryAnimation, child) {
+      var tween = Tween<Offset>(
+        begin: const Offset(0.0, 1.0),
+        end: Offset.zero,
+      );
+      var curveTween = CurveTween(curve: Curves.ease);
+
+      return SlideTransition(
+        position: animation.drive(curveTween).drive(tween),
+        child: child,
+      );
+    },
+  );
+}
+
+class _Page2 extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Page 2')),
+      body: Center(
+        child: Text(
+          'Page 2!',
+          style: Theme.of(context).textTheme.headlineMedium,
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/tween_sequence.dart

@@ -0,0 +1,85 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class TweenSequenceDemo extends StatefulWidget {
+  const TweenSequenceDemo({super.key});
+  static const String routeName = 'basics/chaining_tweens';
+
+  @override
+  State<TweenSequenceDemo> createState() => _TweenSequenceDemoState();
+}
+
+class _TweenSequenceDemoState extends State<TweenSequenceDemo>
+    with SingleTickerProviderStateMixin {
+  static const Duration duration = Duration(seconds: 3);
+  late final AnimationController controller;
+  late final Animation<Color?> animation;
+
+  static final colors = [
+    Colors.red,
+    Colors.orange,
+    Colors.yellow,
+    Colors.green,
+    Colors.blue,
+    Colors.indigo,
+    Colors.purple,
+  ];
+
+  @override
+  void initState() {
+    super.initState();
+
+    final sequenceItems = <TweenSequenceItem<Color?>>[];
+
+    for (var i = 0; i < colors.length; i++) {
+      final beginColor = colors[i];
+      final endColor = colors[(i + 1) % colors.length];
+      final weight = 1 / colors.length;
+
+      sequenceItems.add(
+        TweenSequenceItem<Color?>(
+          tween: ColorTween(begin: beginColor, end: endColor),
+          weight: weight,
+        ),
+      );
+    }
+
+    controller = AnimationController(duration: duration, vsync: this);
+    animation = TweenSequence<Color?>(sequenceItems).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Tween Sequences')),
+      body: Center(
+        child: AnimatedBuilder(
+          animation: animation,
+          builder: (context, child) {
+            return MaterialButton(
+              color: animation.value,
+              onPressed: () async {
+                await controller.forward();
+                controller.reset();
+              },
+              child: child,
+            );
+          },
+          child: const Text(
+            'Animate',
+            style: TextStyle(color: Colors.white),
+          ),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/basics/tweens.dart

@@ -0,0 +1,76 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class TweenDemo extends StatefulWidget {
+  const TweenDemo({super.key});
+  static const String routeName = 'basics/tweens';
+
+  @override
+  State<TweenDemo> createState() => _TweenDemoState();
+}
+
+class _TweenDemoState extends State<TweenDemo>
+    with SingleTickerProviderStateMixin {
+  static const Duration _duration = Duration(seconds: 1);
+  static const double accountBalance = 1000000;
+  late final AnimationController controller;
+  late final Animation<double> animation;
+
+  @override
+  void initState() {
+    super.initState();
+
+    controller = AnimationController(vsync: this, duration: _duration)
+      ..addListener(() {
+        // Marks the widget tree as dirty
+        setState(() {});
+      });
+    animation = Tween(begin: 0.0, end: accountBalance).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Tweens')),
+      body: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ConstrainedBox(
+              constraints: const BoxConstraints(maxWidth: 200),
+              child: Text(
+                '\$${animation.value.toStringAsFixed(2)}',
+                style: const TextStyle(fontSize: 24),
+              ),
+            ),
+            ElevatedButton(
+              child: Text(switch (controller.status) {
+                AnimationStatus.completed => 'Buy a Mansion',
+                AnimationStatus.forward => 'Accruing...',
+                AnimationStatus.reverse => 'Spending...',
+                _ => 'Win the lottery',
+              }),
+              onPressed: () {
+                switch (controller.status) {
+                  case AnimationStatus.completed:
+                    controller.reverse();
+                  default:
+                    controller.forward();
+                }
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/animated_list.dart

@@ -0,0 +1,107 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class AnimatedListDemo extends StatefulWidget {
+  const AnimatedListDemo({super.key});
+  static String routeName = 'misc/animated_list';
+
+  @override
+  State<AnimatedListDemo> createState() => _AnimatedListDemoState();
+}
+
+class _AnimatedListDemoState extends State<AnimatedListDemo> {
+  final GlobalKey<AnimatedListState> _listKey = GlobalKey();
+  final listData = [
+    UserModel(0, 'Govind', 'Dixit'),
+    UserModel(1, 'Greta', 'Stoll'),
+    UserModel(2, 'Monty', 'Carlo'),
+    UserModel(3, 'Petey', 'Cruiser'),
+    UserModel(4, 'Barry', 'Cade'),
+  ];
+  final initialListSize = 5;
+
+  void addUser() {
+    setState(() {
+      var index = listData.length;
+      listData.add(UserModel(++_maxIdValue, 'New', 'Person'));
+      _listKey.currentState!.insertItem(
+        index,
+        duration: const Duration(milliseconds: 300),
+      );
+    });
+  }
+
+  void deleteUser(int id) {
+    setState(() {
+      final index = listData.indexWhere((u) => u.id == id);
+      var user = listData.removeAt(index);
+      _listKey.currentState!.removeItem(index, (context, animation) {
+        return FadeTransition(
+          opacity: CurvedAnimation(
+            parent: animation,
+            curve: const Interval(0.5, 1.0),
+          ),
+          child: SizeTransition(
+            sizeFactor: CurvedAnimation(
+              parent: animation,
+              curve: const Interval(0.0, 1.0),
+            ),
+            // ignore: deprecated_member_use
+            axisAlignment: 0.0,
+            child: _buildItem(user),
+          ),
+        );
+      }, duration: const Duration(milliseconds: 600));
+    });
+  }
+
+  Widget _buildItem(UserModel user) {
+    return ListTile(
+      key: ValueKey<UserModel>(user),
+      title: Text(user.firstName),
+      subtitle: Text(user.lastName),
+      leading: const CircleAvatar(child: Icon(Icons.person)),
+      trailing: IconButton(
+        icon: const Icon(Icons.delete),
+        onPressed: () => deleteUser(user.id),
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('AnimatedList'),
+        actions: [
+          IconButton(icon: const Icon(Icons.add), onPressed: addUser),
+        ],
+      ),
+      body: SafeArea(
+        child: AnimatedList(
+          key: _listKey,
+          initialItemCount: 5,
+          itemBuilder: (context, index, animation) {
+            return FadeTransition(
+              opacity: animation,
+              child: _buildItem(listData[index]),
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+class UserModel {
+  UserModel(this.id, this.firstName, this.lastName);
+
+  final int id;
+  final String firstName;
+  final String lastName;
+}
+
+int _maxIdValue = 4;

animations/lib/src/misc/animated_positioned.dart

@@ -0,0 +1,84 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+
+class AnimatedPositionedDemo extends StatefulWidget {
+  const AnimatedPositionedDemo({super.key});
+  static String routeName = 'misc/animated_positioned';
+
+  @override
+  State<AnimatedPositionedDemo> createState() =>
+      _AnimatedPositionedDemoState();
+}
+
+class _AnimatedPositionedDemoState extends State<AnimatedPositionedDemo> {
+  late double topPosition;
+  late double leftPosition;
+
+  double generateTopPosition(double top) => Random().nextDouble() * top;
+
+  double generateLeftPosition(double left) => Random().nextDouble() * left;
+
+  @override
+  void initState() {
+    super.initState();
+    topPosition = generateTopPosition(30);
+    leftPosition = generateLeftPosition(30);
+  }
+
+  void changePosition(double top, double left) {
+    setState(() {
+      topPosition = generateTopPosition(top);
+      leftPosition = generateLeftPosition(left);
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final size = MediaQuery.of(context).size;
+    final appBar = AppBar(title: const Text('AnimatedPositioned'));
+    final topPadding = MediaQuery.of(context).padding.top;
+    // AnimatedPositioned animates changes to a widget's position within a Stack
+    return Scaffold(
+      appBar: appBar,
+      body: SizedBox(
+        height: size.height,
+        width: size.width,
+        child: Stack(
+          children: [
+            AnimatedPositioned(
+              top: topPosition,
+              left: leftPosition,
+              duration: const Duration(seconds: 1),
+              child: InkWell(
+                onTap: () => changePosition(
+                  size.height -
+                      (appBar.preferredSize.height + topPadding + 50),
+                  size.width - 150,
+                ),
+                child: Container(
+                  alignment: Alignment.center,
+                  width: 150,
+                  height: 50,
+                  color: Theme.of(context).primaryColor,
+                  child: Text(
+                    'Click Me',
+                    style: TextStyle(
+                      color: Theme.of(
+                        context,
+                      ).buttonTheme.colorScheme!.onPrimary,
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/animated_switcher.dart

@@ -0,0 +1,70 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+
+Color generateColor() => Color(0xFFFFFFFF & Random().nextInt(0xFFFFFFFF));
+
+Widget generateContainer(int keyCount) => Container(
+  key: ValueKey<int>(keyCount),
+  height: Random().nextDouble() * 200,
+  width: Random().nextDouble() * 200,
+  decoration: BoxDecoration(
+    color: generateColor(),
+    borderRadius: BorderRadius.circular(Random().nextDouble() * 100),
+    border: Border.all(
+      color: generateColor(),
+      width: Random().nextDouble() * 5,
+    ),
+  ),
+);
+
+class AnimatedSwitcherDemo extends StatefulWidget {
+  const AnimatedSwitcherDemo({super.key});
+  static String routeName = 'misc/animated_switcher';
+
+  @override
+  State<AnimatedSwitcherDemo> createState() => _AnimatedSwitcherDemoState();
+}
+
+class _AnimatedSwitcherDemoState extends State<AnimatedSwitcherDemo> {
+  late Widget container;
+  late int keyCount;
+
+  @override
+  void initState() {
+    super.initState();
+    keyCount = 0;
+    container = generateContainer(keyCount);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('AnimatedSwitcher'),
+        actions: [
+          TextButton(
+            onPressed: () =>
+                setState(() => container = generateContainer(++keyCount)),
+            child: const Text('Change Widget'),
+          ),
+        ],
+      ),
+      body: Center(
+        // AnimatedSwitcher Widget is used to switch between different widgets
+        // with a given transition. You can change the transitions by using
+        // transitionBuilder property.
+        child: AnimatedSwitcher(
+          duration: const Duration(seconds: 1),
+          child: container,
+          transitionBuilder: (child, animation) =>
+              ScaleTransition(scale: animation, child: child),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/card_swipe.dart

@@ -0,0 +1,212 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter/physics.dart';
+
+class CardSwipeDemo extends StatefulWidget {
+  const CardSwipeDemo({super.key});
+  static String routeName = 'misc/card_swipe';
+
+  @override
+  State<CardSwipeDemo> createState() => _CardSwipeDemoState();
+}
+
+class _CardSwipeDemoState extends State<CardSwipeDemo> {
+  late List<String> fileNames;
+
+  @override
+  void initState() {
+    super.initState();
+    _resetCards();
+  }
+
+  void _resetCards() {
+    fileNames = [
+      'assets/eat_cape_town_sm.jpg',
+      'assets/eat_new_orleans_sm.jpg',
+      'assets/eat_sydney_sm.jpg',
+    ];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Card Swipe')),
+      body: Padding(
+        padding: const EdgeInsets.all(12.0),
+        child: Center(
+          child: Column(
+            children: [
+              Expanded(
+                child: ClipRect(
+                  child: Stack(
+                    children: [
+                      for (final fileName in fileNames)
+                        SwipeableCard(
+                          imageAssetName: fileName,
+                          onSwiped: () {
+                            setState(() {
+                              fileNames.remove(fileName);
+                            });
+                          },
+                        ),
+                    ],
+                  ),
+                ),
+              ),
+              ElevatedButton(
+                child: const Text('Refill'),
+                onPressed: () {
+                  setState(() {
+                    _resetCards();
+                  });
+                },
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class Card extends StatelessWidget {
+  final String imageAssetName;
+
+  const Card({required this.imageAssetName, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return AspectRatio(
+      aspectRatio: 3 / 5,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular(20.0),
+          image: DecorationImage(
+            image: AssetImage(imageAssetName),
+            fit: BoxFit.cover,
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class SwipeableCard extends StatefulWidget {
+  final String imageAssetName;
+  final VoidCallback onSwiped;
+
+  const SwipeableCard({
+    required this.onSwiped,
+    required this.imageAssetName,
+    super.key,
+  });
+
+  @override
+  State<SwipeableCard> createState() => _SwipeableCardState();
+}
+
+class _SwipeableCardState extends State<SwipeableCard>
+    with SingleTickerProviderStateMixin {
+  late AnimationController _controller;
+  late Animation<Offset> _animation;
+  late double _dragStartX;
+  bool _isSwipingLeft = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController.unbounded(vsync: this);
+    _animation = _controller.drive(
+      Tween<Offset>(begin: Offset.zero, end: const Offset(1, 0)),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return SlideTransition(
+      position: _animation,
+      child: GestureDetector(
+        onHorizontalDragStart: _dragStart,
+        onHorizontalDragUpdate: _dragUpdate,
+        onHorizontalDragEnd: _dragEnd,
+        child: Card(imageAssetName: widget.imageAssetName),
+      ),
+    );
+  }
+
+  /// Sets the starting position the user dragged from.
+  void _dragStart(DragStartDetails details) {
+    _dragStartX = details.localPosition.dx;
+  }
+
+  /// Changes the animation to animate to the left or right depending on the
+  /// swipe, and sets the AnimationController's value to the swiped amount.
+  void _dragUpdate(DragUpdateDetails details) {
+    var isSwipingLeft = (details.localPosition.dx - _dragStartX) < 0;
+    if (isSwipingLeft != _isSwipingLeft) {
+      _isSwipingLeft = isSwipingLeft;
+      _updateAnimation(details.localPosition.dx);
+    }
+
+    setState(() {
+      final size = context.size;
+
+      if (size == null) {
+        return;
+      }
+
+      // Calculate the amount dragged in unit coordinates (between 0 and 1)
+      // using this widgets width.
+      _controller.value =
+          (details.localPosition.dx - _dragStartX).abs() / size.width;
+    });
+  }
+
+  /// Runs the fling / spring animation using the final velocity of the drag
+  /// gesture.
+  void _dragEnd(DragEndDetails details) {
+    final size = context.size;
+
+    if (size == null) {
+      return;
+    }
+
+    var velocity = (details.velocity.pixelsPerSecond.dx / size.width).abs();
+    _animate(velocity: velocity);
+  }
+
+  void _updateAnimation(double dragPosition) {
+    _animation = _controller.drive(
+      Tween<Offset>(
+        begin: Offset.zero,
+        end: _isSwipingLeft ? const Offset(-1, 0) : const Offset(1, 0),
+      ),
+    );
+  }
+
+  void _animate({double velocity = 0}) {
+    var description = const SpringDescription(
+      mass: 50,
+      stiffness: 1,
+      damping: 1,
+    );
+    var simulation = SpringSimulation(
+      description,
+      _controller.value,
+      1,
+      velocity,
+    );
+    _controller.animateWith(simulation).then<void>((_) {
+      widget.onSwiped();
+    });
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+}

animations/lib/src/misc/carousel.dart

@@ -0,0 +1,115 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+
+class CarouselDemo extends StatelessWidget {
+  CarouselDemo({super.key});
+  static String routeName = 'misc/carousel';
+
+  static const List<String> fileNames = [
+    'assets/eat_cape_town_sm.jpg',
+    'assets/eat_new_orleans_sm.jpg',
+    'assets/eat_sydney_sm.jpg',
+  ];
+
+  final List<Widget> images = fileNames
+      .map((file) => Image.asset(file, fit: BoxFit.cover))
+      .toList();
+
+  @override
+  Widget build(context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Carousel Demo')),
+      body: Center(
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: AspectRatio(
+            aspectRatio: 1,
+            child: Carousel(itemBuilder: widgetBuilder),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget widgetBuilder(BuildContext context, int index) {
+    return images[index % images.length];
+  }
+}
+
+typedef OnCurrentItemChangedCallback = void Function(int currentItem);
+
+class Carousel extends StatefulWidget {
+  final IndexedWidgetBuilder itemBuilder;
+
+  const Carousel({super.key, required this.itemBuilder});
+
+  @override
+  State<Carousel> createState() => _CarouselState();
+}
+
+class _CarouselState extends State<Carousel> {
+  late final PageController _controller;
+  late int _currentPage;
+  bool _pageHasChanged = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _currentPage = 0;
+    _controller = PageController(
+      viewportFraction: .85,
+      initialPage: _currentPage,
+    );
+  }
+
+  @override
+  Widget build(context) {
+    var size = MediaQuery.of(context).size;
+    return PageView.builder(
+      onPageChanged: (value) {
+        setState(() {
+          _pageHasChanged = true;
+          _currentPage = value;
+        });
+      },
+      controller: _controller,
+      scrollBehavior: ScrollConfiguration.of(context).copyWith(
+        dragDevices: {
+          ui.PointerDeviceKind.touch,
+          ui.PointerDeviceKind.mouse,
+        },
+      ),
+      itemBuilder: (context, index) => AnimatedBuilder(
+        animation: _controller,
+        builder: (context, child) {
+          var result = _pageHasChanged
+              ? _controller.page!
+              : _currentPage * 1.0;
+
+          // The horizontal position of the page between a 1 and 0
+          var value = result - index;
+          value = (1 - (value.abs() * .5)).clamp(0.0, 1.0);
+
+          return Center(
+            child: SizedBox(
+              height: Curves.easeOut.transform(value) * size.height,
+              width: Curves.easeOut.transform(value) * size.width,
+              child: child,
+            ),
+          );
+        },
+        child: widget.itemBuilder(context, index),
+      ),
+    );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+}

animations/lib/src/misc/curved_animation.dart

@@ -0,0 +1,159 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:math' as math;
+import 'package:flutter/material.dart';
+
+class CurvedAnimationDemo extends StatefulWidget {
+  const CurvedAnimationDemo({super.key});
+  static const String routeName = 'misc/curved_animation';
+
+  @override
+  State<CurvedAnimationDemo> createState() => _CurvedAnimationDemoState();
+}
+
+class CurveChoice {
+  final Curve curve;
+  final String name;
+
+  const CurveChoice({required this.curve, required this.name});
+}
+
+class _CurvedAnimationDemoState extends State<CurvedAnimationDemo>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController controller;
+  late final Animation<double> animationRotation;
+  late final Animation<Offset> animationTranslation;
+  static const _duration = Duration(seconds: 4);
+  List<CurveChoice> curves = const [
+    CurveChoice(curve: Curves.bounceIn, name: 'Bounce In'),
+    CurveChoice(curve: Curves.bounceOut, name: 'Bounce Out'),
+    CurveChoice(curve: Curves.easeInCubic, name: 'Ease In Cubic'),
+    CurveChoice(curve: Curves.easeOutCubic, name: 'Ease Out Cubic'),
+    CurveChoice(curve: Curves.easeInExpo, name: 'Ease In Expo'),
+    CurveChoice(curve: Curves.easeOutExpo, name: 'Ease Out Expo'),
+    CurveChoice(curve: Curves.elasticIn, name: 'Elastic In'),
+    CurveChoice(curve: Curves.elasticOut, name: 'Elastic Out'),
+    CurveChoice(curve: Curves.easeInQuart, name: 'Ease In Quart'),
+    CurveChoice(curve: Curves.easeOutQuart, name: 'Ease Out Quart'),
+    CurveChoice(curve: Curves.easeInCirc, name: 'Ease In Circle'),
+    CurveChoice(curve: Curves.easeOutCirc, name: 'Ease Out Circle'),
+  ];
+  late CurveChoice selectedForwardCurve, selectedReverseCurve;
+  late final CurvedAnimation curvedAnimation;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = AnimationController(duration: _duration, vsync: this);
+    selectedForwardCurve = curves[0];
+    selectedReverseCurve = curves[0];
+    curvedAnimation = CurvedAnimation(
+      parent: controller,
+      curve: selectedForwardCurve.curve,
+      reverseCurve: selectedReverseCurve.curve,
+    );
+    animationRotation =
+        Tween<double>(begin: 0, end: 2 * math.pi).animate(curvedAnimation)
+          ..addListener(() {
+            setState(() {});
+          })
+          ..addStatusListener((status) {
+            if (status == AnimationStatus.completed) {
+              controller.reverse();
+            }
+          });
+    animationTranslation =
+        Tween<Offset>(
+            begin: const Offset(-1, 0),
+            end: const Offset(1, 0),
+          ).animate(curvedAnimation)
+          ..addListener(() {
+            setState(() {});
+          })
+          ..addStatusListener((status) {
+            if (status == AnimationStatus.completed) {
+              controller.reverse();
+            }
+          });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Curved Animation')),
+      body: Column(
+        children: [
+          const SizedBox(height: 20.0),
+          Text(
+            'Select Curve for forward motion',
+            style: Theme.of(context).textTheme.titleLarge,
+          ),
+          DropdownButton<CurveChoice>(
+            items: curves.map((curve) {
+              return DropdownMenuItem<CurveChoice>(
+                value: curve,
+                child: Text(curve.name),
+              );
+            }).toList(),
+            onChanged: (newCurve) {
+              if (newCurve != null) {
+                setState(() {
+                  selectedForwardCurve = newCurve;
+                  curvedAnimation.curve = selectedForwardCurve.curve;
+                });
+              }
+            },
+            value: selectedForwardCurve,
+          ),
+          const SizedBox(height: 15.0),
+          Text(
+            'Select Curve for reverse motion',
+            style: Theme.of(context).textTheme.titleLarge,
+          ),
+          DropdownButton<CurveChoice>(
+            items: curves.map((curve) {
+              return DropdownMenuItem<CurveChoice>(
+                value: curve,
+                child: Text(curve.name),
+              );
+            }).toList(),
+            onChanged: (newCurve) {
+              if (newCurve != null) {
+                setState(() {
+                  selectedReverseCurve = newCurve;
+                  curvedAnimation.reverseCurve = selectedReverseCurve.curve;
+                });
+              }
+            },
+            value: selectedReverseCurve,
+          ),
+          const SizedBox(height: 35.0),
+          Transform.rotate(
+            angle: animationRotation.value,
+            child: const Center(child: FlutterLogo(size: 100)),
+          ),
+          const SizedBox(height: 35.0),
+          FractionalTranslation(
+            translation: animationTranslation.value,
+            child: const FlutterLogo(size: 100),
+          ),
+          const SizedBox(height: 25.0),
+          ElevatedButton(
+            onPressed: () {
+              controller.forward();
+            },
+            child: const Text('Animate'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+}

animations/lib/src/misc/expand_card.dart

@@ -0,0 +1,87 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class ExpandCardDemo extends StatelessWidget {
+  const ExpandCardDemo({super.key});
+  static const String routeName = 'misc/expand_card';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Expandable Card')),
+      body: const Center(child: ExpandCard()),
+    );
+  }
+}
+
+class ExpandCard extends StatefulWidget {
+  const ExpandCard({super.key});
+  @override
+  State<ExpandCard> createState() => _ExpandCardState();
+}
+
+class _ExpandCardState extends State<ExpandCard>
+    with SingleTickerProviderStateMixin {
+  static const Duration duration = Duration(milliseconds: 300);
+  bool selected = false;
+
+  double get size => selected ? 256 : 128;
+
+  void toggleExpanded() {
+    setState(() {
+      selected = !selected;
+    });
+  }
+
+  @override
+  Widget build(context) {
+    return GestureDetector(
+      onTap: () => toggleExpanded(),
+      child: Card(
+        child: Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: AnimatedContainer(
+            duration: duration,
+            width: size,
+            height: size,
+            curve: Curves.ease,
+            child: AnimatedCrossFade(
+              duration: duration,
+              firstCurve: Curves.easeInOutCubic,
+              secondCurve: Curves.easeInOutCubic,
+              crossFadeState: selected
+                  ? CrossFadeState.showSecond
+                  : CrossFadeState.showFirst,
+              // Use Positioned.fill() to pass the constraints to its children.
+              // This allows the Images to use BoxFit.cover to cover the correct
+              // size
+              layoutBuilder:
+                  (topChild, topChildKey, bottomChild, bottomChildKey) {
+                    return Stack(
+                      children: [
+                        Positioned.fill(
+                          key: bottomChildKey,
+                          child: bottomChild,
+                        ),
+                        Positioned.fill(key: topChildKey, child: topChild),
+                      ],
+                    );
+                  },
+              firstChild: Image.asset(
+                'assets/eat_cape_town_sm.jpg',
+                fit: BoxFit.cover,
+              ),
+              secondChild: Image.asset(
+                'assets/eat_new_orleans_sm.jpg',
+                fit: BoxFit.cover,
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/flutter_animate.dart

@@ -0,0 +1,40 @@
+// Copyright 2023 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_animate/flutter_animate.dart';
+
+// Demonstrating the `flutter_animate` package
+class FlutterAnimateDemo extends StatelessWidget {
+  static const String routeName = 'misc/flutter_animate';
+
+  const FlutterAnimateDemo({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Flutter Animate Demo')),
+      body: Center(
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child:
+              Text(
+                    "Hello Flutter Animate",
+                    style: Theme.of(context).textTheme.headlineLarge,
+                  )
+                  .animate(onPlay: (controller) => controller.repeat())
+                  .then(delay: 250.ms)
+                  .fadeIn(duration: 500.ms)
+                  .then(delay: 250.ms)
+                  .shimmer(duration: 400.ms)
+                  .then(delay: 250.ms)
+                  .slide()
+                  .then(delay: 250.ms)
+                  .blur(duration: 500.ms)
+                  .then(delay: 100.ms),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/focus_image.dart

@@ -0,0 +1,114 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class FocusImageDemo extends StatelessWidget {
+  const FocusImageDemo({super.key});
+  static String routeName = 'misc/focus_image';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Focus Image')),
+      body: const Grid(),
+    );
+  }
+}
+
+class Grid extends StatelessWidget {
+  const Grid({super.key});
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: GridView.builder(
+        itemCount: 40,
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+          crossAxisCount: 4,
+        ),
+        itemBuilder: (context, index) {
+          return (index >= 20)
+              ? const SmallCard(
+                  imageAssetName: 'assets/eat_cape_town_sm.jpg',
+                )
+              : const SmallCard(
+                  imageAssetName: 'assets/eat_new_orleans_sm.jpg',
+                );
+        },
+      ),
+    );
+  }
+}
+
+Route _createRoute(BuildContext parentContext, String image) {
+  return PageRouteBuilder<void>(
+    pageBuilder: (context, animation, secondaryAnimation) {
+      return _SecondPage(image);
+    },
+    transitionsBuilder: (context, animation, secondaryAnimation, child) {
+      var rectAnimation = _createTween(
+        parentContext,
+      ).chain(CurveTween(curve: Curves.ease)).animate(animation);
+
+      return Stack(
+        children: [
+          PositionedTransition(rect: rectAnimation, child: child),
+        ],
+      );
+    },
+  );
+}
+
+Tween<RelativeRect> _createTween(BuildContext context) {
+  var windowSize = MediaQuery.of(context).size;
+  var box = context.findRenderObject() as RenderBox;
+  var rect = box.localToGlobal(Offset.zero) & box.size;
+  var relativeRect = RelativeRect.fromSize(rect, windowSize);
+
+  return RelativeRectTween(begin: relativeRect, end: RelativeRect.fill);
+}
+
+class SmallCard extends StatelessWidget {
+  const SmallCard({required this.imageAssetName, super.key});
+  final String imageAssetName;
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      child: Material(
+        child: InkWell(
+          onTap: () {
+            var nav = Navigator.of(context);
+            nav.push<void>(_createRoute(context, imageAssetName));
+          },
+          child: Image.asset(imageAssetName, fit: BoxFit.cover),
+        ),
+      ),
+    );
+  }
+}
+
+class _SecondPage extends StatelessWidget {
+  final String imageAssetName;
+
+  const _SecondPage(this.imageAssetName);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      body: Center(
+        child: Material(
+          child: InkWell(
+            onTap: () => Navigator.of(context).pop(),
+            child: AspectRatio(
+              aspectRatio: 1,
+              child: Image.asset(imageAssetName, fit: BoxFit.cover),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

animations/lib/src/misc/hero_animation.dart

@@ -0,0 +1,66 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class HeroAnimationDemo extends StatelessWidget {
+  const HeroAnimationDemo({super.key});
+  static const String routeName = 'misc/hero_animation';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Hero Animation')),
+      body: GestureDetector(
+        child: Hero(
+          tag: 'hero-page-child',
+          child: _createHeroContainer(
+            size: 50.0,
+            color: Colors.grey.shade300,
+          ),
+        ),
+        onTap: () =>
+            Navigator.of(
+              context,
+            ).push<void>(
+              MaterialPageRoute(builder: (context) => const HeroPage()),
+            ),
+      ),
+    );
+  }
+}
+
+class HeroPage extends StatelessWidget {
+  const HeroPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.lightBlue,
+      appBar: AppBar(),
+      body: Center(
+        child: Hero(
+          tag: 'hero-page-child',
+          child: _createHeroContainer(size: 100.0, color: Colors.white),
+        ),
+      ),
+    );
+  }
+}
+
+StatelessWidget _createHeroContainer({
+  required double size,
+  required Color color,
+}) {
+  return Container(
+    height: size,
+    width: size,
+    padding: const EdgeInsets.all(10.0),
+    margin: size < 100.0
+        ? const EdgeInsets.all(10.0)
+        : const EdgeInsets.all(0),
+    decoration: BoxDecoration(shape: BoxShape.circle, color: color),
+    child: const FlutterLogo(),
+  );
+}

animations/lib/src/misc/misc.dart

@@ -0,0 +1,12 @@
+export 'animated_list.dart';
+export 'animated_positioned.dart';
+export 'animated_switcher.dart';
+export 'card_swipe.dart';
+export 'carousel.dart';
+export 'curved_animation.dart';
+export 'expand_card.dart';
+export 'flutter_animate.dart';
+export 'focus_image.dart';
+export 'hero_animation.dart';
+export 'physics_card_drag.dart';
+export 'repeating_animation.dart';

animations/lib/src/misc/physics_card_drag.dart

@@ -0,0 +1,111 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter/physics.dart';
+
+class PhysicsCardDragDemo extends StatelessWidget {
+  const PhysicsCardDragDemo({super.key});
+  static const String routeName = 'misc/physics_card';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Spring Physics')),
+      body: const DraggableCard(child: FlutterLogo(size: 128)),
+    );
+  }
+}
+
+/// A draggable card that moves back to [Alignment.center] when it's
+/// released.
+class DraggableCard extends StatefulWidget {
+  const DraggableCard({required this.child, super.key});
+  final Widget child;
+
+  @override
+  State<DraggableCard> createState() => _DraggableCardState();
+}
+
+class _DraggableCardState extends State<DraggableCard>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+
+  /// The alignment of the card as it is dragged or being animated.
+  ///
+  /// While the card is being dragged, this value is set to the values computed
+  /// in the GestureDetector onPanUpdate callback. If the animation is running,
+  /// this value is set to the value of the [_animation].
+  var _dragAlignment = Alignment.center;
+
+  late Animation<Alignment> _animation;
+
+  final _spring = const SpringDescription(
+    mass: 10,
+    stiffness: 1000,
+    damping: 0.7,
+  );
+
+  /// Calculate the velocity relative to the unit interval, [0,1],
+  /// used by the animation controller.
+  double _normalizeVelocity(Offset velocity, Size size) {
+    final normalizedVelocity = Offset(
+      velocity.dx / size.width,
+      velocity.dy / size.height,
+    );
+    // Returning negative implies dragging away from center
+    return -normalizedVelocity.distance;
+  }
+
+  /// Calculates and runs a [SpringSimulation]
+  void _runAnimation(Offset velocity, Size size) {
+    _animation = _controller.drive(
+      AlignmentTween(begin: _dragAlignment, end: Alignment.center),
+    );
+
+    final simulation = SpringSimulation(
+      _spring,
+      0,
+      1,
+      _normalizeVelocity(velocity, size),
+    );
+
+    _controller.animateWith(simulation);
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController.unbounded(vsync: this)
+      ..addListener(
+        () => setState(() => _dragAlignment = _animation.value),
+      );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final size = MediaQuery.of(context).size;
+    return GestureDetector(
+      onPanStart: (details) => _controller.stop(canceled: true),
+      onPanUpdate: (details) => setState(
+        () => _dragAlignment += Alignment(
+          details.delta.dx / (size.width / 2),
+          details.delta.dy / (size.height / 2),
+        ),
+      ),
+      onPanEnd: (details) =>
+          _runAnimation(details.velocity.pixelsPerSecond, size),
+      child: Align(
+        alignment: _dragAlignment,
+        child: Card(child: widget.child),
+      ),
+    );
+  }
+}

animations/lib/src/misc/repeating_animation.dart

@@ -0,0 +1,63 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class RepeatingAnimationDemo extends StatefulWidget {
+  const RepeatingAnimationDemo({super.key});
+  static String routeName = 'misc/repeating_animation';
+
+  @override
+  State<RepeatingAnimationDemo> createState() =>
+      _RepeatingAnimationDemoState();
+}
+
+class _RepeatingAnimationDemoState extends State<RepeatingAnimationDemo>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+  late final Animation<BorderRadius?> _borderRadius;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _controller = AnimationController(
+      duration: const Duration(seconds: 2),
+      vsync: this,
+    )..repeat(reverse: true);
+
+    _borderRadius = BorderRadiusTween(
+      begin: BorderRadius.circular(100.0),
+      end: BorderRadius.circular(0.0),
+    ).animate(_controller);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Repeating Animation')),
+      body: Center(
+        child: AnimatedBuilder(
+          animation: _borderRadius,
+          builder: (context, child) {
+            return Container(
+              width: 200,
+              height: 200,
+              decoration: BoxDecoration(
+                color: Colors.deepPurple,
+                borderRadius: _borderRadius.value,
+              ),
+            );
+          },
+        ),
+      ),
+    );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+}

animations/linux/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

animations/linux/CMakeLists.txt

@@ -0,0 +1,145 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.10)
+project(runner LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "animations")
+# The unique GTK application identifier for this application. See:
+# https://wiki.gnome.org/HowDoI/ChooseApplicationID
+set(APPLICATION_ID "dev.flutter.animations")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(SET CMP0063 NEW)
+
+# Load bundled libraries from the lib/ directory relative to the binary.
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Root filesystem for cross-building.
+if(FLUTTER_TARGET_PLATFORM_SYSROOT)
+  set(CMAKE_SYSROOT ${FLUTTER_TARGET_PLATFORM_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+
+# Define build configuration options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
+
+# Define the application target. To change its name, change BINARY_NAME above,
+# not the value here, or `flutter run` will no longer work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add dependency libraries. Add any application-specific dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Only the install-generated bundle's copy of the executable will launch
+# correctly, since the resources must in the right relative locations. To avoid
+# people trying to run the unbundled copy, put it in a subdirectory instead of
+# the default top-level location.
+set_target_properties(${BINARY_NAME}
+  PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/intermediates_do_not_run"
+)
+
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+foreach(bundled_library ${PLUGIN_BUNDLED_LIBRARIES})
+  install(FILES "${bundled_library}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endforeach(bundled_library)
+
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/linux/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

animations/linux/flutter/CMakeLists.txt

@@ -0,0 +1,88 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

animations/linux/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,11 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+}

animations/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

animations/linux/flutter/generated_plugins.cmake

@@ -0,0 +1,23 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/linux plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)

animations/linux/main.cc

@@ -0,0 +1,6 @@
+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}

animations/linux/my_application.cc

@@ -0,0 +1,104 @@
+#include "my_application.h"
+
+#include <flutter_linux/flutter_linux.h>
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+
+#include "flutter/generated_plugin_registrant.h"
+
+struct _MyApplication {
+  GtkApplication parent_instance;
+  char** dart_entrypoint_arguments;
+};
+
+G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
+
+// Implements GApplication::activate.
+static void my_application_activate(GApplication* application) {
+  MyApplication* self = MY_APPLICATION(application);
+  GtkWindow* window =
+      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
+
+  // Use a header bar when running in GNOME as this is the common style used
+  // by applications and is the setup most users will be using (e.g. Ubuntu
+  // desktop).
+  // If running on X and not using GNOME then just use a traditional title bar
+  // in case the window manager does more exotic layout, e.g. tiling.
+  // If running on Wayland assume the header bar will work (may need changing
+  // if future cases occur).
+  gboolean use_header_bar = TRUE;
+#ifdef GDK_WINDOWING_X11
+  GdkScreen* screen = gtk_window_get_screen(window);
+  if (GDK_IS_X11_SCREEN(screen)) {
+    const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
+    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
+      use_header_bar = FALSE;
+    }
+  }
+#endif
+  if (use_header_bar) {
+    GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
+    gtk_widget_show(GTK_WIDGET(header_bar));
+    gtk_header_bar_set_title(header_bar, "animations");
+    gtk_header_bar_set_show_close_button(header_bar, TRUE);
+    gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
+  } else {
+    gtk_window_set_title(window, "animations");
+  }
+
+  gtk_window_set_default_size(window, 1280, 720);
+  gtk_widget_show(GTK_WIDGET(window));
+
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);
+
+  FlView* view = fl_view_new(project);
+  gtk_widget_show(GTK_WIDGET(view));
+  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
+
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+
+  gtk_widget_grab_focus(GTK_WIDGET(view));
+}
+
+// Implements GApplication::local_command_line.
+static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
+  MyApplication* self = MY_APPLICATION(application);
+  // Strip out the first argument as it is the binary name.
+  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
+
+  g_autoptr(GError) error = nullptr;
+  if (!g_application_register(application, nullptr, &error)) {
+     g_warning("Failed to register: %s", error->message);
+     *exit_status = 1;
+     return TRUE;
+  }
+
+  g_application_activate(application);
+  *exit_status = 0;
+
+  return TRUE;
+}
+
+// Implements GObject::dispose.
+static void my_application_dispose(GObject* object) {
+  MyApplication* self = MY_APPLICATION(object);
+  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
+  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
+}
+
+static void my_application_class_init(MyApplicationClass* klass) {
+  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
+  G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
+  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
+}
+
+static void my_application_init(MyApplication* self) {}
+
+MyApplication* my_application_new() {
+  return MY_APPLICATION(g_object_new(my_application_get_type(),
+                                     "application-id", APPLICATION_ID,
+                                     "flags", G_APPLICATION_NON_UNIQUE,
+                                     nullptr));
+}

animations/linux/my_application.h

@@ -0,0 +1,18 @@
+#ifndef FLUTTER_MY_APPLICATION_H_
+#define FLUTTER_MY_APPLICATION_H_
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(MyApplication, my_application, MY, APPLICATION,
+                     GtkApplication)
+
+/**
+ * my_application_new:
+ *
+ * Creates a new Flutter-based application.
+ *
+ * Returns: a new #MyApplication.
+ */
+MyApplication* my_application_new();
+
+#endif  // FLUTTER_MY_APPLICATION_H_