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|
//! Display images in your user interface.
use crate::{layout, Element, Hasher, Layout, Length, Point, Size, Widget};
use std::hash::Hash;
/// A frame that displays an image while keeping aspect ratio.
///
/// # Example
///
/// ```
/// # use iced_native::Image;
///
/// let image = Image::new("resources/ferris.png");
/// ```
#[derive(Debug)]
pub struct Image {
/// The image path
pub path: String,
/// The width of the image
pub width: Length,
/// The height of the image
pub height: Length,
}
impl Image {
/// Creates a new [`Image`] with the given path.
///
/// [`Image`]: struct.Image.html
pub fn new<T: Into<String>>(path: T) -> Self {
Image {
path: path.into(),
width: Length::Shrink,
height: Length::Shrink,
}
}
/// Sets the width of the [`Image`] boundaries.
///
/// [`Image`]: struct.Image.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Image`] boundaries.
///
/// [`Image`]: struct.Image.html
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Image
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.path);
let aspect_ratio = width as f32 / height as f32;
// TODO: Deal with additional cases
let (width, height) = match (self.width, self.height) {
(Length::Units(width), _) => (
self.width,
Length::Units((width as f32 / aspect_ratio).round() as u16),
),
(_, _) => {
(Length::Units(width as u16), Length::Units(height as u16))
}
};
let mut size = limits.width(width).height(height).resolve(Size::ZERO);
size.height = size.width / aspect_ratio;
layout::Node::new(size)
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
_cursor_position: Point,
) -> Renderer::Output {
renderer.draw(&self, layout)
}
fn hash_layout(&self, state: &mut Hasher) {
self.width.hash(state);
self.height.hash(state);
}
}
/// The renderer of an [`Image`].
///
/// Your [renderer] will need to implement this trait before being able to use
/// an [`Image`] in your user interface.
///
/// [`Image`]: struct.Image.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
fn dimensions(&self, path: &str) -> (u32, u32);
/// Draws an [`Image`].
///
/// [`Image`]: struct.Image.html
fn draw(&mut self, image: &Image, layout: Layout<'_>) -> Self::Output;
}
impl<'a, Message, Renderer> From<Image> for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
{
fn from(image: Image) -> Element<'a, Message, Renderer> {
Element::new(image)
}
}
|
