let slider = |
#min: &f64 = &0.0,
#max: &f64 = &100.0,
#step: &[f64, null] = &null,
#on_change: fn(v: f64) -> Any = |_| null,
#on_release: fn(e: null) -> Any = |_| null,
#width: &Length = &`Fill,
#height: &[f64, null] = &null,
#disabled: &bool = &false,
value: &f64
| -> Widget `Slider({ value, min, max, step, on_change: &on_change, on_release: &on_release, width, height, disabled })