1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
//! Display images in your user interface.
pub mod viewer;
pub use viewer::Viewer;
use crate::image::{self, Handle};
use crate::layout;
use crate::renderer;
use crate::{Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget};
use std::hash::Hash;
/// A frame that displays an image while keeping aspect ratio.
///
/// # Example
///
/// ```
/// # use iced_native::widget::Image;
/// #
/// let image = Image::new("resources/ferris.png");
/// ```
///
/// <img src="https://github.com/hecrj/iced/blob/9712b319bb7a32848001b96bd84977430f14b623/examples/resources/ferris.png?raw=true" width="300">
#[derive(Debug, Hash)]
pub struct Image {
handle: Handle,
width: Length,
height: Length,
}
impl Image {
/// Creates a new [`Image`] with the given path.
pub fn new<T: Into<Handle>>(handle: T) -> Self {
Image {
handle: handle.into(),
width: Length::Shrink,
height: Length::Shrink,
}
}
/// Sets the width of the [`Image`] boundaries.
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Image`] boundaries.
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Image
where
Renderer: image::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,
_style: &renderer::Style,
layout: Layout<'_>,
_cursor_position: Point,
_viewport: &Rectangle,
) {
renderer.draw(self.handle.clone(), layout.bounds());
}
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);
}
}
impl<'a, Message, Renderer> From<Image> for Element<'a, Message, Renderer>
where
Renderer: image::Renderer,
{
fn from(image: Image) -> Element<'a, Message, Renderer> {
Element::new(image)
}
}
|
