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