https://github.com/kiranandcode/observable-rs

Idiomatic, Unstable, observables for Rust
https://github.com/kiranandcode/observable-rs

Last synced: 26 days ago
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Idiomatic, Unstable, observables for Rust

• Host: GitHub
• URL: https://github.com/kiranandcode/observable-rs
• Owner: kiranandcode
• Created: 2018-08-04T10:51:02.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-08-04T10:54:57.000Z (over 6 years ago)
• Last Synced: 2024-07-20T19:13:02.095Z (4 months ago)
• Language: Rust
• Size: 1.95 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# observable 

### WARNING - this is an unstable crate that may change at any time. Use at your own risk

Idiomatic Observables for rust.

```rust

#[derive(Debug, Clone)]

pub enum Event ( Example1, Example2, Example3 };

pub struct Game {

  ...

  observable: ObservableMixin

  ...

}

impl AsMut> for Game { fn as_mut(&mut self) -> &mut

ObservableMixin { &self.observable }

/// Game is now an observable struct

```

To create an observer, we need a struct that implements `Observer`

```rust

struct GameListener { }

impl Observer for GameListener {

  pub fn notify(&self, event: Event) {

        println!("Got event: {:?}", event);

  }

}

```

To add an observer, we can need to provide a weak reference to an observable object:

```rust

    let mut game = Game::new();

    /// we need the clone here to upcast to Rc

    let observer : Rc> = Rc::new(GameListener{}).clone();

    game.register(Rc::downgrade(&observer));

```

Or, if using the 'views' feature, with my other crate 'dependent_view',

```rust

    let mut game = Game::new();

    let mut observer : DependentRc = DependentRc::new(GameListener{});

    game.as_mut().register_dependable(&mut observer);

    // notice here how we get to keep the level of specificity with regards to our observer

    // rather than having to upcast our only reference

```

And finally, we can send events to our observers:

```rust

    game.notify_observers(Event::Example1);

```