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// IMPORTS ---------------------------------------------------------------------
import gleam/int
import lustre
import lustre/attribute
import lustre/element.{type Element, text}
import lustre/element/html.{button, div, p}
import lustre/event
// MAIN ------------------------------------------------------------------------
pub fn main() {
// A `simple` lustre application doesn't produce `Effect`s. These are best to
// start with if you're just getting started with lustre or you know you don't
// need the runtime to manage any side effects.
let app = lustre.simple(init, update, view)
let assert Ok(_) = lustre.start(app, "[data-lustre-app]", Nil)
}
// MODEL -----------------------------------------------------------------------
pub type Model {
Model(count: Int, active: Bool)
}
pub fn init(_) -> Model {
Model(count: 0, active: True)
}
// UPDATE ----------------------------------------------------------------------
pub opaque type Msg {
Incr
Decr
Reset
Toggle
}
pub fn update(model: Model, msg: Msg) -> Model {
case msg {
Incr -> Model(..model, count: model.count + 1)
Decr -> Model(..model, count: model.count - 1)
Reset -> Model(..model, count: 0)
Toggle -> Model(..model, active: !model.active)
}
}
// VIEW ------------------------------------------------------------------------
pub fn view(model: Model) -> Element(Msg) {
let on_click = fn(msg) {
case model.active {
True -> event.on_click(msg)
False -> attribute.none()
}
}
div([], [
button([on_click(Incr)], [text("+")]),
button([on_click(Decr)], [text("-")]),
button([on_click(Reset)], [text("Reset")]),
button([event.on_click(Toggle)], [
case model.active {
True -> text("Disable")
False -> text("Enable")
},
]),
p([], [text(int.to_string(model.count))]),
])
}
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