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Sky |
=== |
-Sky is an experimental, high-performance UI framework for mobile apps. Sky helps |
-you create apps with beautiful user interfaces and high-quality interactive |
-design that run smoothly at 120 Hz. |
+For information about using Sky, please see the |
+[Sky SDK](https://github.com/domokit/sky_sdk/). |
-Sky consists of two components: |
- |
-1. *The Sky engine.* The [engine](engine) is the core of the system system. |
- Written in C++, the engine provides the muscle of the Sky system. The engine |
- provides several primitives, including a soft real-time scheduler and a |
- hierarchial, retained-mode graphics system, that let you build high-quality |
- apps. |
- |
-2. *The Sky framework.* The [framework](framework) makes it easy to build apps |
- using Sky by providing familiar user interface widgets, such as buttons, |
- infinite lists, and animations, on top of the engine using Dart. These |
- extensible components follow a functional programming style inspired by |
- React. |
- |
-Sky is still experimental. We're experimenting with different ideas and |
-exploring various approaches, many of which won't work and will need to be |
-discarded, but, if we're lucky, some of which might turn out to be useful. |
- |
-Examples |
--------- |
- |
-The simplest Sky app is, appropriately, HelloWorldApp: |
- |
-```dart |
-import 'package:sky/framework/fn.dart'; |
- |
-class HelloWorldApp extends App { |
- Node build() { |
- return new Text('Hello, world!'); |
- } |
-} |
- |
-void main() { |
- new HelloWorldApp(); |
-} |
-``` |
- |
-Execution starts in `main`, which creates the `HelloWorldApp`. The framework |
-then marks `HelloWorldApp` as dirty, which schedules it to build during the next |
-animation frame. Each animation frame, the framework calls `build` on all the |
-dirty components and diffs the virtual `Node` hierarchy returned this frame with |
-the hierarchy returned last frame. Any differences are then applied as mutations |
-to the physical heiarchy retained by the engine. |
- |
-For a more featureful example, please see the |
-[example stocks app](examples/stocks/lib/stocks_app.dart). |
- |
-Services |
--------- |
- |
-Sky apps can access services from the host operating system using Mojo. For |
-example, you can access the network using the `network_service.mojom` interface. |
-Although you can use these low-level interfaces directly, you might prefer to |
-access these services via libraries in the framework. For example, the |
-`fetch.dart` library wraps the underlying `network_service.mojom` in an |
-ergonomic interface: |
- |
-```dart |
-import 'package:sky/framework/net/fetch.dart'; |
- |
-void foo() { |
- fetch('example.txt').then((Response response) { |
- print(response.bodyAsString()); |
- }); |
-} |
-``` |
- |
-Supported platforms |
-------------------- |
- |
-Currently, Sky supports the Android and Mojo operating systems. |
- |
-Specifications |
--------------- |
- |
-We're documenting Sky with a [set of technical specifications](specs) that |
-define precisely the behavior of the engine. Currently both the implementation |
-and the specification are in flux, but hopefully they'll converge over time. |
- |
-Contributing |
------------- |
- |
-Instructions for building and testing Sky are contained in [HACKING.md](HACKING.md). |
+For information about contributing to Sky, please see [HACKING.md](HACKING.md). |