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//! Display a horizontal or vertical rule for dividing content.
use std::hash::Hash;
use crate::{
layout, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
};
/// Display a horizontal or vertical rule for dividing content.
#[derive(Debug, Copy, Clone)]
pub struct Rule<Renderer: self::Renderer> {
width: Length,
height: Length,
style: Renderer::Style,
is_horizontal: bool,
}
impl<Renderer: self::Renderer> Rule<Renderer> {
/// Creates a horizontal [`Rule`] for dividing content by the given vertical spacing.
pub fn horizontal(spacing: u16) -> Self {
Rule {
width: Length::Fill,
height: Length::from(Length::Units(spacing)),
style: Renderer::Style::default(),
is_horizontal: true,
}
}
/// Creates a vertical [`Rule`] for dividing content by the given horizontal spacing.
pub fn vertical(spacing: u16) -> Self {
Rule {
width: Length::from(Length::Units(spacing)),
height: Length::Fill,
style: Renderer::Style::default(),
is_horizontal: false,
}
}
/// Sets the style of the [`Rule`].
pub fn style(mut self, style: impl Into<Renderer::Style>) -> Self {
self.style = style.into();
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Rule<Renderer>
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
_renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits.width(self.width).height(self.height);
layout::Node::new(limits.resolve(Size::ZERO))
}
fn draw(
&self,
renderer: &mut Renderer,
_defaults: &Renderer::Defaults,
layout: Layout<'_>,
_cursor_position: Point,
_viewport: &Rectangle,
) -> Renderer::Output {
renderer.draw(layout.bounds(), &self.style, self.is_horizontal)
}
fn hash_layout(&self, state: &mut Hasher) {
struct Marker;
std::any::TypeId::of::<Marker>().hash(state);
self.width.hash(state);
self.height.hash(state);
}
}
/// The renderer of a [`Rule`].
pub trait Renderer: crate::Renderer {
/// The style supported by this renderer.
type Style: Default;
/// Draws a [`Rule`].
///
/// It receives:
/// * the bounds of the [`Rule`]
/// * the style of the [`Rule`]
/// * whether the [`Rule`] is horizontal (true) or vertical (false)
fn draw(
&mut self,
bounds: Rectangle,
style: &Self::Style,
is_horizontal: bool,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Rule<Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'a + self::Renderer,
Message: 'a,
{
fn from(rule: Rule<Renderer>) -> Element<'a, Message, Renderer> {
Element::new(rule)
}
}
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