euv_ui/component/slider/view/
impl.rs

1use super::*;
2
3impl EuvSliderHelpers {
4    /// Maps `value` onto the `0.0..=100.0` percentage range spanned by
5    /// `min..=max`.
6    ///
7    /// A degenerate range (`min == max`) reports `0.0` instead of
8    /// dividing by zero, and values outside the range are clamped so a
9    /// mis-typed signal can never produce a nonsensical percentage.
10    ///
11    /// # Arguments
12    ///
13    /// - `f64` - The value to map.
14    /// - `f64` - The low end of the range.
15    /// - `f64` - The high end of the range.
16    ///
17    /// # Returns
18    ///
19    /// - `f64` - The percentage position of `value` within the range.
20    pub fn percent(value: f64, min: f64, max: f64) -> f64 {
21        if max <= min {
22            return 0.0;
23        }
24        let ratio: f64 = (value - min) / (max - min);
25        let clamped: f64 = ratio.clamp(0.0, 1.0);
26        clamped * PERCENT_SCALE
27    }
28
29    /// Builds an input handler that writes the range value into `signal`.
30    ///
31    /// The parsed value is clamped to the `[min, max]` window so a
32    /// keyboard-driven overshoot cannot push the signal outside the
33    /// range the component advertises.
34    ///
35    /// # Arguments
36    ///
37    /// - `Signal<f64>` - The signal updated with the new value.
38    /// - `f64` - The low end of the accepted range.
39    /// - `f64` - The high end of the accepted range.
40    ///
41    /// # Returns
42    ///
43    /// - `Option<Rc<dyn Fn(Event)>>` - An input handler writing the
44    ///   clamped range value into the signal.
45    pub fn on_slider_input(signal: Signal<f64>, min: f64, max: f64) -> Option<Rc<dyn Fn(Event)>> {
46        Some(Rc::new(move |event: Event| {
47            let raw: Option<f64> = event.target().and_then(|target: EventTarget| {
48                if let Ok(input) = target.dyn_into::<HtmlInputElement>() {
49                    return input.value().parse::<f64>().ok();
50                }
51                None
52            });
53            if let Some(parsed) = raw {
54                signal.set(parsed.clamp(min, max));
55            }
56        }))
57    }
58}
euv_ui/component/slider/view/impl.rs

euv_ui/component/slider/view/
impl.rs
