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|
//! Provide visual feedback to your users when performing a slow task.
use crate::{
Element, Hasher, Layout, MouseCursor, Node, Point, Rectangle, Style, Widget,
};
use std::hash::Hash;
/// A bar that is filled based on an amount of progress.
///
/// It implements [`Widget`] when the associated `Renderer` implements the
/// [`progress_bar::Renderer`] trait.
///
/// [`Widget`]: ../trait.Widget.html
/// [`progress_bar::Renderer`]: trait.Renderer.html
///
/// # Example
///
/// ```
/// use iced::ProgressBar;
///
/// let progress = 0.75;
///
/// ProgressBar::new(progress);
/// ```
#[derive(Debug)]
pub struct ProgressBar {
progress: f32,
style: Style,
}
impl ProgressBar {
/// Creates a new [`ProgressBar`] filled based on the given amount of
/// progress.
///
/// The progress should be in the `0.0..=1.0` range. `0` meaning no work
/// done, and `1` meaning work finished.
///
/// [`ProgressBar`]: struct.ProgressBar.html
pub fn new(progress: f32) -> Self {
ProgressBar {
progress,
style: Style::default().fill_width(),
}
}
/// Sets the width of the [`ProgressBar`] in pixels.
///
/// [`ProgressBar`]: struct.ProgressBar.html
pub fn width(mut self, width: u16) -> Self {
self.style = self.style.width(width);
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for ProgressBar
where
Renderer: self::Renderer,
{
fn node(&self, _renderer: &Renderer) -> Node {
Node::new(self.style.height(50))
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
_cursor_position: Point,
) -> MouseCursor {
renderer.draw(layout.bounds(), self.progress);
MouseCursor::OutOfBounds
}
fn hash_layout(&self, state: &mut Hasher) {
self.style.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 {
/// Draws a [`ProgressBar`].
///
/// It receives:
/// * the bounds of the [`ProgressBar`]
/// * the current progress of the [`ProgressBar`], in the `0.0..=1.0`
/// range.
///
/// [`ProgressBar`]: struct.ProgressBar.html
fn draw(&mut self, bounds: Rectangle, progress: f32);
}
impl<'a, Message, Renderer> From<ProgressBar> for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
{
fn from(progress_bar: ProgressBar) -> Element<'a, Message, Renderer> {
Element::new(progress_bar)
}
}
|
