Crate carnelian

Carnelian

Carnelian is a prototype framework for writing Fuchsia applications in Rust.

Below is a tiny example of a Carnelian app.

The ViewAssistant trait is a good place to start when learning about Carnelian.

use anyhow::Error;
use carnelian::{
    make_app_assistant,
    render::{self},
    App, AppAssistant, ViewAssistant, ViewAssistantContext, ViewAssistantPtr, ViewKey,
};
use fuchsia_zircon::Event;

#[derive(Default)]
struct SampleAppAssistant;

impl AppAssistant for SampleAppAssistant {
    fn setup(&mut self) -> Result<(), Error> {
        Ok(())
    }

    fn create_view_assistant(&mut self, _: ViewKey) -> Result<ViewAssistantPtr, Error> {
        SampleViewAssistant::new()
    }
}

struct SampleViewAssistant;

impl SampleViewAssistant {
    fn new() -> Result<ViewAssistantPtr, Error> {
        Ok(Box::new(Self {}))
    }
}

impl ViewAssistant for SampleViewAssistant {
    fn render(
        &mut self,
        _render_context: &mut render::Context,
        _buffer_ready_event: Event,
        _view_context: &ViewAssistantContext,
    ) -> Result<(), Error> {
        Ok(())
    }
}

fn main() -> Result<(), Error> {
    App::run(make_app_assistant::<SampleAppAssistant>())
}

Re-exports

• pub use crate::app::make_app_assistant;
• pub use crate::app::App;
• pub use crate::app::AppAssistant;
• pub use crate::app::AppAssistantPtr;
• pub use crate::app::AppSender;
• pub use crate::app::AssistantCreator;
• pub use crate::app::AssistantCreatorFunc;
• pub use crate::app::LocalBoxFuture;
• pub use crate::app::MessageTarget;
• pub use crate::geometry::Coord;
• pub use crate::geometry::IntCoord;
• pub use crate::geometry::IntPoint;
• pub use crate::geometry::IntRect;
• pub use crate::geometry::IntSize;
• pub use crate::geometry::Point;
• pub use crate::geometry::Rect;
• pub use crate::geometry::Size;

Modules

• app
  Application related items
• color
  Color-related items
• drawing
  Drawing-related items Functions for drawing in Carnelian Carnelian uses the Render abstraction over Forma and Spinel to put pixels on screen. The items in this module are higher- level drawing primitives.
• geometry
  Geometry-related items.
• input
  Input-related items.
• input_ext
  Extension items related to input.
• render
  Render-related items.
• scene
  UI item abstraction

Macros

• derive_handle_message
  Macro to implement a handle message trait method that delegates known types to other methods on the struct implementing ViewAssistant.
• derive_handle_message_with_default
  Macro to implement a handle message trait method that delegates known types to other methods on the struct implementing ViewAssistant.

Structs

• ViewAssistantContext
  parameter struct passed to setup and update trait methods.
• ViewKey
  Key identifying a view.

Traits

• ViewAssistant
  Trait that allows Carnelian developers to customize the behavior of views.

Functions

• make_message
  Make a message

Type Aliases

• Message
  Message type
• ViewAssistantPtr
  Reference to a view assistant. This type is likely to change in the future so using this type alias might make for easier forward migration.