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https://github.com/cksac/compose-rt
A positional memoization runtime
https://github.com/cksac/compose-rt
Last synced: 15 days ago
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A positional memoization runtime
- Host: GitHub
- URL: https://github.com/cksac/compose-rt
- Owner: cksac
- License: apache-2.0
- Created: 2022-03-11T05:32:02.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-03-19T06:13:10.000Z (over 2 years ago)
- Last Synced: 2024-04-23T23:15:29.268Z (2 months ago)
- Language: Rust
- Homepage:
- Size: 145 KB
- Stars: 35
- Watchers: 4
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE-APACHE
Lists
- awesome-stars - cksac/compose-rt - A positional memoization runtime (Rust)
README
# compose-rt
[](https://docs.rs/compose-rt)
[](https://crates.io/crates/compose-rt)
A positional memoization runtime similar to Jetpack Compose Runtime.
>What this means is that Compose is, at its core, a general-purpose tool for managing a tree of nodes of any type. Well a “tree of nodes” describes just about anything, and as a result Compose can target just about anything. – [jakewharton](https://jakewharton.com/a-jetpack-compose-by-any-other-name/)
# use cases
- Declarative GUI
- https://github.com/cksac/oxui, an experiment GUI framework similar to Flutter
- Automatic differentiation
- Others...
# examples
- Below example show how to build a declarative GUI similar to Jetpack Compose UI
```toml
[dependencies]
compose-rt = "0.12"
downcast-rs = "1.2"
log = "0.4"
env_logger = "0.6"
fltk = { version = "^1.2", features = ["fltk-bundled"] }
```
```rust
#![allow(non_snake_case)]
use compose_rt::{compose, Composer, Recomposer};
use fltk::{
app, button,
group::{self, Flex},
prelude::*,
text,
window::Window,
};
use std::{cell::RefCell, rc::Rc};
////////////////////////////////////////////////////////////////////////////
// User application
////////////////////////////////////////////////////////////////////////////
pub struct Movie {
pub id: usize,
pub name: String,
pub img_url: String,
}
impl Movie {
pub fn new(id: usize, name: impl Into, img_url: impl Into) -> Self {
Movie {
id,
name: name.into(),
img_url: img_url.into(),
}
}
}
#[compose]
pub fn MoviesScreen(movies: &Vec) {
Column(cx, |cx| {
for movie in movies {
cx.tag(movie.id, |cx| MovieOverview(cx, &movie));
}
});
}
#[compose]
pub fn MovieOverview(movie: &Movie) {
Column(cx, |cx| {
Text(cx, &movie.name);
let count = cx.remember(|| Rc::new(RefCell::new(0usize)));
let c = count.clone();
Button(
cx,
&format!("{} get {} likes", movie.name, count.borrow()),
move || *c.borrow_mut() += 1,
);
Text(cx, format!("Count {}", count.borrow()));
});
}
fn main() {
// Setup logging
env_logger::Builder::from_default_env()
.filter_level(log::LevelFilter::Trace)
.init();
let app = app::App::default();
// define root compose
let root_fn = |cx: &mut Composer, movies| Window(cx, |cx| MoviesScreen(cx, movies));
let mut recomposer = Recomposer::new(20);
let movies = vec![Movie::new(1, "A", "IMG_A"), Movie::new(2, "B", "IMG_B")];
recomposer.compose(|cx| {
root_fn(cx, &movies);
});
while app.wait() {
recomposer.compose(|cx| {
root_fn(cx, &movies);
});
}
}
////////////////////////////////////////////////////////////////////////////
// Components - Usage of compose-rt
////////////////////////////////////////////////////////////////////////////
#[compose(skip_inject_cx = true)]
pub fn Window(cx: &mut Composer, content: C)
where
C: Fn(&mut Composer),
{
cx.group(
|_| Window::default().with_size(400, 300),
|_| false,
content,
|_, _| {},
|win| {
win.end();
win.show();
},
)
}
#[compose(skip_inject_cx = true)]
pub fn Column(cx: &mut Composer, content: C)
where
C: Fn(&mut Composer),
{
cx.group(
|_| {
let mut flex = Flex::new(0, 0, 400, 300, None);
flex.set_type(group::FlexType::Column);
flex
},
|_| false,
content,
|_, _| {},
|flex| {
flex.end();
},
);
}
#[compose(skip_inject_cx = true)]
pub fn Text(cx: &mut Composer, text: impl AsRef) {
let text = text.as_ref();
cx.memo(
|_| {
let mut editor = text::TextEditor::default()
.with_size(390, 290)
.center_of_parent();
let mut buf = text::TextBuffer::default();
buf.set_text(text);
editor.set_buffer(buf);
editor
},
|n| n.buffer().unwrap().text().eq(text),
|n| {
n.buffer().as_mut().unwrap().set_text(text);
},
|_| {},
);
}
#[compose(skip_inject_cx = true)]
pub fn Button(cx: &mut Composer, text: &str, mut cb: F)
where
F: 'static + FnMut(),
{
cx.memo(
|_| {
let mut btn = button::Button::new(160, 210, 80, 40, None);
btn.set_callback(move |_| cb());
btn
},
|n| n.label().eq(text),
|n| {
n.set_label(text);
},
|_| {},
);
}
```