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pub mod viewer;
pub use viewer::Viewer;
use crate::image;
use crate::layout;
use crate::renderer;
use crate::widget::Tree;
use crate::{
ContentFit, Element, Layout, Length, Point, Rectangle, Size, Vector, Widget,
};
use std::hash::Hash;
pub fn viewer<Handle>(handle: Handle) -> Viewer<Handle> {
Viewer::new(handle)
}
#[derive(Debug)]
pub struct Image<Handle> {
handle: Handle,
width: Length,
height: Length,
content_fit: ContentFit,
}
impl<Handle> Image<Handle> {
pub fn new<T: Into<Handle>>(handle: T) -> Self {
Image {
handle: handle.into(),
width: Length::Shrink,
height: Length::Shrink,
content_fit: ContentFit::Contain,
}
}
pub fn width(mut self, width: impl Into<Length>) -> Self {
self.width = width.into();
self
}
pub fn height(mut self, height: impl Into<Length>) -> Self {
self.height = height.into();
self
}
pub fn content_fit(self, content_fit: ContentFit) -> Self {
Self {
content_fit,
..self
}
}
}
pub fn layout<Renderer, Handle>(
renderer: &Renderer,
limits: &layout::Limits,
handle: &Handle,
width: Length,
height: Length,
content_fit: ContentFit,
) -> layout::Node
where
Renderer: image::Renderer<Handle = Handle>,
{
let image_size = {
let Size { width, height } = renderer.dimensions(handle);
Size::new(width as f32, height as f32)
};
let raw_size = limits.width(width).height(height).resolve(image_size);
let full_size = content_fit.fit(image_size, raw_size);
let final_size = Size {
width: match width {
Length::Shrink => f32::min(raw_size.width, full_size.width),
_ => raw_size.width,
},
height: match height {
Length::Shrink => f32::min(raw_size.height, full_size.height),
_ => raw_size.height,
},
};
layout::Node::new(final_size)
}
pub fn draw<Renderer, Handle>(
renderer: &mut Renderer,
layout: Layout<'_>,
handle: &Handle,
content_fit: ContentFit,
) where
Renderer: image::Renderer<Handle = Handle>,
Handle: Clone + Hash,
{
let Size { width, height } = renderer.dimensions(handle);
let image_size = Size::new(width as f32, height as f32);
let bounds = layout.bounds();
let adjusted_fit = content_fit.fit(image_size, bounds.size());
let render = |renderer: &mut Renderer| {
let offset = Vector::new(
(bounds.width - adjusted_fit.width).max(0.0) / 2.0,
(bounds.height - adjusted_fit.height).max(0.0) / 2.0,
);
let drawing_bounds = Rectangle {
width: adjusted_fit.width,
height: adjusted_fit.height,
..bounds
};
renderer.draw(handle.clone(), drawing_bounds + offset)
};
if adjusted_fit.width > bounds.width || adjusted_fit.height > bounds.height
{
renderer.with_layer(bounds, render);
} else {
render(renderer)
}
}
impl<Message, Renderer, Handle> Widget<Message, Renderer> for Image<Handle>
where
Renderer: image::Renderer<Handle = Handle>,
Handle: Clone + Hash,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
layout(
renderer,
limits,
&self.handle,
self.width,
self.height,
self.content_fit,
)
}
fn draw(
&self,
_state: &Tree,
renderer: &mut Renderer,
_theme: &Renderer::Theme,
_style: &renderer::Style,
layout: Layout<'_>,
_cursor_position: Point,
_viewport: &Rectangle,
) {
draw(renderer, layout, &self.handle, self.content_fit)
}
}
impl<'a, Message, Renderer, Handle> From<Image<Handle>>
for Element<'a, Message, Renderer>
where
Renderer: image::Renderer<Handle = Handle>,
Handle: Clone + Hash + 'a,
{
fn from(image: Image<Handle>) -> Element<'a, Message, Renderer> {
Element::new(image)
}
}