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|
//! Display vector graphics in your application.
use crate::{layout, Element, Hasher, Layout, Length, Point, Size, Widget};
use std::{
hash::Hash,
path::{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.
///
/// [`Svg`]: struct.Svg.html
#[derive(Debug, Clone)]
pub struct Svg {
handle: Handle,
width: Length,
height: Length,
}
impl Svg {
/// Creates a new [`Svg`] from the given [`Handle`].
///
/// [`Svg`]: struct.Svg.html
/// [`Handle`]: struct.Handle.html
pub fn new(handle: impl Into<Handle>) -> Self {
Svg {
handle: handle.into(),
width: Length::Fill,
height: Length::Fill,
}
}
/// Sets the width of the [`Svg`].
///
/// [`Svg`]: struct.Svg.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Svg`].
///
/// [`Svg`]: struct.Svg.html
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Svg
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 (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,
_defaults: &Renderer::Defaults,
layout: Layout<'_>,
_cursor_position: Point,
) -> Renderer::Output {
renderer.draw(self.handle.clone(), layout)
}
fn hash_layout(&self, state: &mut Hasher) {
self.width.hash(state);
self.height.hash(state);
}
}
/// An [`Svg`] handle.
///
/// [`Svg`]: struct.Svg.html
#[derive(Debug, Clone)]
pub struct Handle {
id: u64,
path: PathBuf,
}
impl Handle {
/// Creates an SVG [`Handle`] pointing to the vector image of the given
/// path.
///
/// [`Handle`]: struct.Handle.html
pub fn from_path<T: Into<PathBuf>>(path: T) -> Handle {
use std::hash::Hasher as _;
let path = path.into();
let mut hasher = Hasher::default();
path.hash(&mut hasher);
Handle {
id: hasher.finish(),
path,
}
}
/// Returns the unique identifier of the [`Handle`].
///
/// [`Handle`]: struct.Handle.html
pub fn id(&self) -> u64 {
self.id
}
/// Returns a reference to the path of the [`Handle`].
///
/// [`Handle`]: enum.Handle.html
pub fn path(&self) -> &Path {
&self.path
}
}
impl From<String> for Handle {
fn from(path: String) -> Handle {
Handle::from_path(path)
}
}
impl From<&str> for Handle {
fn from(path: &str) -> Handle {
Handle::from_path(path)
}
}
/// The renderer of an [`Svg`].
///
/// Your [renderer] will need to implement this trait before being able to use
/// an [`Svg`] in your user interface.
///
/// [`Svg`]: struct.Svg.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
/// Returns the default dimensions of an [`Svg`] located on the given path.
///
/// [`Svg`]: struct.Svg.html
fn dimensions(&self, handle: &Handle) -> (u32, u32);
/// Draws an [`Svg`].
///
/// [`Svg`]: struct.Svg.html
fn draw(&mut self, handle: Handle, layout: Layout<'_>) -> Self::Output;
}
impl<'a, Message, Renderer> From<Svg> for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
{
fn from(icon: Svg) -> Element<'a, Message, Renderer> {
Element::new(icon)
}
}
|
