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import gleam/int
import lustre
import lustre/attribute
import lustre/element.{type Element}
import lustre/element/html
import lustre/event
// These examples are written with `lustre/ui` in mind. They'll work regardless,
// but to see what `lustre/ui` can do make sure to run each of these examples with
// the `--include-styles` flag:
//
// $ gleam run -m lustre dev --include-styles
//
// In your own apps, make sure to add the `lustre/ui` dependency and include the
// stylesheet somewhere.
import lustre/ui
// MAIN ------------------------------------------------------------------------
pub fn main() {
let app = lustre.simple(init, update, view)
let assert Ok(_) = lustre.start(app, "#app", 0)
}
// MODEL -----------------------------------------------------------------------
type Model =
Int
fn init(initial_count: Int) -> Model {
case initial_count < 0 {
True -> 0
False -> initial_count
}
}
// UPDATE ----------------------------------------------------------------------
pub opaque type Msg {
Incr
Decr
}
fn update(model: Model, msg: Msg) -> Model {
case msg {
Incr -> model + 1
Decr -> model - 1
}
}
// VIEW ------------------------------------------------------------------------
fn view(model: Model) -> Element(Msg) {
let styles = [#("width", "100vw"), #("height", "100vh"), #("padding", "1rem")]
let count = int.to_string(model)
ui.centre(
[attribute.style(styles)],
ui.stack([], [
ui.button([event.on_click(Incr)], [element.text("+")]),
html.p([attribute.style([#("text-align", "center")])], [
element.text(count),
]),
ui.button([event.on_click(Decr)], [element.text("-")]),
]),
)
}
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