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//! Display a progressbar
//!
//!
//! [`Progressbar`]: struct.Progressbar.html
use crate::{
layout, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
};
use std::{hash::Hash, ops::RangeInclusive};
/// A progressbar
///
/// # Example
///
/// ```
/// # use iced_native::Progressbar;
///
/// Progressbar::new(0.0..=100.0, value);
/// ```
///
/// TODO: Get a progressbar render
/// 
#[allow(missing_debug_implementations)]
pub struct Progressbar {
range: RangeInclusive<f32>,
value: f32,
width: Length,
}
impl Progressbar {
/// Creates a new [`Progressbar`].
///
/// It expects:
/// * an inclusive range of possible values
/// * the current value of the [`Progressbar`]
///
/// [`Progressbar`]: struct.Progressbar.html
pub fn new(range: RangeInclusive<f32>, value: f32) -> Self {
Progressbar {
value: value.max(*range.start()).min(*range.end()),
range,
width: Length::Fill,
}
}
/// Sets the width of the [`Progressbar`].
///
/// [`Progressbar`]: struct.Progressbar.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Progressbar
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
Length::Shrink
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits
.width(self.width)
.height(Length::Units(renderer.height() as u16));
let size = limits.resolve(Size::ZERO);
layout::Node::new(size)
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
_cursor_position: Point,
) -> Renderer::Output {
renderer.draw(layout.bounds(), self.range.clone(), self.value)
}
fn hash_layout(&self, state: &mut Hasher) {
self.width.hash(state);
}
}
/// The renderer of a [`Progressbar`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Progressbar`] in your user interface.
///
/// [`Progressbar`]: struct.Progressbar.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
/// Returns the height of the [`Progressbar`].
///
/// [`Progressbar`]: struct.Progressbar.html
fn height(&self) -> u32;
/// Draws a [`Progressbar`].
///
/// It receives:
/// * the local state of the [`Progressbar`]
/// * the bounds of the [`Progressbar`]
/// * the range of values of the [`Progressbar`]
/// * the current value of the [`Progressbar`]
///
/// [`Progressbar`]: struct.Progressbar.html
/// [`State`]: struct.State.html
/// [`Class`]: enum.Class.html
fn draw(
&self,
bounds: Rectangle,
range: RangeInclusive<f32>,
value: f32,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Progressbar> for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: 'static,
{
fn from(progressbar: Progressbar) -> Element<'a, Message, Renderer> {
Element::new(progressbar)
}
}
|
