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Implement Image in iced_pure

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Héctor Ramón Jiménez 2022-02-13 16:51:31 +07:00
parent 09c96a6d81
commit 45455be450
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GPG key ID: 140CC052C94F138E
4 changed files with 134 additions and 25 deletions
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73
native/src/widget/image.rs
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@ -51,6 +51,53 @@ impl<Handle> Image<Handle> {
}
}
/// Computes the layout of an [`Image`].
pub fn layout<Renderer, Handle>(
renderer: &Renderer,
limits: &layout::Limits,
handle: &Handle,
width: Length,
height: Length,
) -> layout::Node
where
Renderer: image::Renderer<Handle = Handle>,
{
let (original_width, original_height) = renderer.dimensions(handle);
let mut size = limits
.width(width)
.height(height)
.resolve(Size::new(original_width as f32, original_height as f32));
let aspect_ratio = original_width as f32 / original_height as f32;
let viewport_aspect_ratio = size.width / size.height;
if viewport_aspect_ratio > aspect_ratio {
size.width =
original_width as f32 * size.height / original_height as f32;
} else {
size.height =
original_height as f32 * size.width / original_width as f32;
}
layout::Node::new(size)
}
/// Hashes the layout attributes of an [`Image`].
pub fn hash_layout<Handle: Hash>(
state: &mut Hasher,
handle: &Handle,
width: Length,
height: Length,
) {
struct Marker;
std::any::TypeId::of::<Marker>().hash(state);
handle.hash(state);
width.hash(state);
height.hash(state);
}
impl<Message, Renderer, Handle> Widget<Message, Renderer> for Image<Handle>
where
Renderer: image::Renderer<Handle = Handle>,
@ -69,24 +116,7 @@ where
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)
layout(renderer, limits, &self.handle, self.width, self.height)
}
fn draw(
@ -101,12 +131,7 @@ where
}
fn hash_layout(&self, state: &mut Hasher) {
struct Marker;
std::any::TypeId::of::<Marker>().hash(state);
self.handle.hash(state);
self.width.hash(state);
self.height.hash(state);
hash_layout(state, &self.handle, self.width, self.height)
}
}