# Scenario App

This folder contains a dart:ui application and scripts to compile it to AOT
for exercising embedders.

It intentionally has no dependencies on the Flutter framework or tooling, such
that it should be buildable as a presubmit or postsubmit to the engine even in
the face of changes to Dart or dart:ui that require upstream changes in the
Flutter tooling.

To add a new scenario, create a new subclass of `Scenario` and add it to the
map in `main.dart`. For an example, see animated_color_square.dart, which draws
a continuously animating colored square that bounces off the sides of the
viewport.

## Building for iOS

In this folder, after building the `ios_host` and `ios_profile` engine targets,
run:

```bash
./compile_ios_aot.sh ../../../out/host_profile ../../../out/ios_profile/clang_x64/
```

This will create an `App.framework` copy it as well as the correct
`Flutter.framework` to where the Xcode project expects to find them.

You can then use `xcodebuild` to build the `ios/Scenarios/Scenarios.xcodeproj`,
or open that in Xcode and build it that way.

Currently, only AOT modes are supported.

## Building for Android

In this folder, after building the `host_profile` and `android_profile_arm64`
engine targets, run:

```bash
./compile_android_aot.sh ../../../out/host_profile ../../../out/android_profile_arm64/clang_x64/
```

This will produce a suitable `libapp.so` for building with an Android app and
copy it (along with flutter.jar) to where Gradle will expect to find it to build
the app in the `android/` folder. The app can be run by opening it in Android
Studio and running it, or by running `./gradlew assemble` in the `android/`
folder and installing the APK from the correct folder in
`android/app/build/outputs/apk`.