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//! Display vector graphics in your application.
use crate::layout;
use crate::renderer;
use crate::svg::{self, Handle};
use crate::{Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget};
use std::hash::Hash;
use std::path::PathBuf;
/// A vector graphics image.
///
/// An [`Svg`] image resizes smoothly without losing any quality.
///
/// [`Svg`] images can have a considerable rendering cost when resized,
/// specially when they are complex.
#[derive(Debug, Clone)]
pub struct Svg {
handle: Handle,
width: Length,
height: Length,
}
impl Svg {
/// Creates a new [`Svg`] from the given [`Handle`].
pub fn new(handle: impl Into<Handle>) -> Self {
Svg {
handle: handle.into(),
width: Length::Fill,
height: Length::Shrink,
}
}
/// Creates a new [`Svg`] that will display the contents of the file at the
/// provided path.
pub fn from_path(path: impl Into<PathBuf>) -> Self {
Self::new(Handle::from_path(path))
}
/// Sets the width of the [`Svg`].
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Svg`].
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Svg
where
Renderer: svg::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let (width, height) = renderer.dimensions(&self.handle);
let aspect_ratio = width as f32 / height as f32;
let mut size = limits
.width(self.width)
.height(self.height)
.resolve(Size::new(width as f32, height as f32));
let viewport_aspect_ratio = size.width / size.height;
if viewport_aspect_ratio > aspect_ratio {
size.width = width as f32 * size.height / height as f32;
} else {
size.height = height as f32 * size.width / width as f32;
}
layout::Node::new(size)
}
fn draw(
&self,
renderer: &mut Renderer,
_style: &renderer::Style,
layout: Layout<'_>,
_cursor_position: Point,
_viewport: &Rectangle,
) {
renderer.draw(self.handle.clone(), layout.bounds())
}
fn hash_layout(&self, state: &mut Hasher) {
std::any::TypeId::of::<Svg>().hash(state);
self.handle.hash(state);
self.width.hash(state);
self.height.hash(state);
}
}
impl<'a, Message, Renderer> From<Svg> for Element<'a, Message, Renderer>
where
Renderer: svg::Renderer,
{
fn from(icon: Svg) -> Element<'a, Message, Renderer> {
Element::new(icon)
}
}
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