152 lines
4.2 KiB
Rust
152 lines
4.2 KiB
Rust
//! Display an interactive selector of a single value from a range of values.
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//!
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//! A [`Slider`] has some local [`State`].
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//!
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//! [`Slider`]: struct.Slider.html
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//! [`State`]: struct.State.html
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use crate::{Bus, Css, Element, Length, Widget};
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use dodrio::bumpalo;
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use std::{ops::RangeInclusive, rc::Rc};
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/// An horizontal bar and a handle that selects a single value from a range of
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/// values.
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///
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/// A [`Slider`] will try to fill the horizontal space of its container.
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///
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/// [`Slider`]: struct.Slider.html
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///
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/// # Example
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/// ```
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/// # use iced_web::{slider, Slider};
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/// #
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/// pub enum Message {
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/// SliderChanged(f32),
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/// }
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///
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/// let state = &mut slider::State::new();
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/// let value = 50.0;
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///
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/// Slider::new(state, 0.0..=100.0, value, Message::SliderChanged);
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/// ```
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///
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/// 
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#[allow(missing_debug_implementations)]
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pub struct Slider<'a, Message> {
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_state: &'a mut State,
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range: RangeInclusive<f32>,
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value: f32,
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on_change: Rc<Box<dyn Fn(f32) -> Message>>,
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width: Length,
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}
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impl<'a, Message> Slider<'a, Message> {
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/// Creates a new [`Slider`].
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///
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/// It expects:
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/// * the local [`State`] of the [`Slider`]
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/// * an inclusive range of possible values
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/// * the current value of the [`Slider`]
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/// * a function that will be called when the [`Slider`] is dragged.
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/// It receives the new value of the [`Slider`] and must produce a
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/// `Message`.
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///
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/// [`Slider`]: struct.Slider.html
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/// [`State`]: struct.State.html
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pub fn new<F>(
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state: &'a mut State,
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range: RangeInclusive<f32>,
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value: f32,
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on_change: F,
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) -> Self
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where
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F: 'static + Fn(f32) -> Message,
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{
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Slider {
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_state: state,
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value: value.max(*range.start()).min(*range.end()),
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range,
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on_change: Rc::new(Box::new(on_change)),
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width: Length::Fill,
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}
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}
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/// Sets the width of the [`Slider`].
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///
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/// [`Slider`]: struct.Slider.html
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pub fn width(mut self, width: Length) -> Self {
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self.width = width;
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self
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}
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}
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impl<'a, Message> Widget<Message> for Slider<'a, Message>
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where
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Message: 'static,
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{
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fn node<'b>(
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&self,
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bump: &'b bumpalo::Bump,
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bus: &Bus<Message>,
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_style_sheet: &mut Css<'b>,
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) -> dodrio::Node<'b> {
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use dodrio::builder::*;
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use wasm_bindgen::JsCast;
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let (start, end) = self.range.clone().into_inner();
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let min = bumpalo::format!(in bump, "{}", start);
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let max = bumpalo::format!(in bump, "{}", end);
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let value = bumpalo::format!(in bump, "{}", self.value);
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let on_change = self.on_change.clone();
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let event_bus = bus.clone();
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// TODO: Make `step` configurable
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// TODO: Complete styling
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input(bump)
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.attr("type", "range")
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.attr("step", "0.01")
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.attr("min", min.into_bump_str())
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.attr("max", max.into_bump_str())
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.attr("value", value.into_bump_str())
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.attr("style", "width: 100%")
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.on("input", move |_root, _vdom, event| {
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let slider = match event.target().and_then(|t| {
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t.dyn_into::<web_sys::HtmlInputElement>().ok()
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}) {
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None => return,
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Some(slider) => slider,
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};
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if let Ok(value) = slider.value().parse::<f32>() {
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event_bus.publish(on_change(value));
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}
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})
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.finish()
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}
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}
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impl<'a, Message> From<Slider<'a, Message>> for Element<'a, Message>
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where
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Message: 'static,
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{
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fn from(slider: Slider<'a, Message>) -> Element<'a, Message> {
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Element::new(slider)
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}
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}
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/// The local state of a [`Slider`].
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///
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/// [`Slider`]: struct.Slider.html
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
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pub struct State;
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impl State {
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/// Creates a new [`State`].
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///
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/// [`State`]: struct.State.html
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pub fn new() -> Self {
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Self
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}
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}
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