Constant SLIDER 

pub const SLIDER: &str = "type Slider {\n  label: Str = \"Slider\";\n  action: func(Number) -> Res[Unit, DataError] = ignore_number;\n  min: Number = 0;\n  max: Number = 1;\n  value: Number = 0;\n}";

A host-rendered numeric control with a typed value action.

The host supplies a Number to action. A callback accepting input owns any update to Slider.value; schema construction and host input do not mutate it automatically.

Declaration

type Slider {
  label: Str = "Slider";
  action: func(Number) -> Res[Unit, DataError] = ignore_number;
  min: Number = 0;
  max: Number = 1;
  value: Number = 0;
}

Fields and methods

• label: Visible label; defaults to Slider.

• action: Typed callback accepting the requested numeric value; defaults to ignore_number.

• min: Lower requested bound; defaults to 0. Hosts should present min no greater than max.

• max: Upper requested bound; defaults to 1. Hosts should present max no less than min.

• value: Current requested numeric value; defaults to 0 and changes only through explicit checked state updates.

Inspect defaults

The default range is 0 through 1.

let slider = Slider {};
print(slider.max);

Expose a changeable control

Change Gain: set_gain clamps the input, updates the stored Slider value, and logs the accepted value.

func set_gain(value: Number) -> Res[Unit, DataError] {
  let mut slider = get[Slider](control);
  let accepted = value.clamp(slider.min, slider.max)?;
  slider.value = accepted;
  set(control, slider);
  print(accepted);
  ret Ok(());
}
let control = spawn(Slider { label: "Gain", action: set_gain, min: 0, max: 2, value: 1 });
print("slider ready");