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|
//! Display images in your user interface.
use crate::{
Element, Hasher, Layout, MouseCursor, Node, Point, Rectangle, Style, Widget,
};
use std::hash::Hash;
/// A frame that displays an image while keeping aspect ratio.
///
/// It implements [`Widget`] when the associated `Renderer` implements the
/// [`image::Renderer`] trait.
///
/// [`Widget`]: ../../core/trait.Widget.html
/// [`image::Renderer`]: trait.Renderer.html
///
/// # Example
///
/// ```
/// use iced::Image;
///
/// # let my_handle = String::from("some_handle");
/// let image = Image::new(my_handle);
/// ```
pub struct Image<I> {
image: I,
source: Option<Rectangle<u16>>,
style: Style,
}
impl<I> std::fmt::Debug for Image<I> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Image")
.field("source", &self.source)
.field("style", &self.style)
.finish()
}
}
impl<I> Image<I> {
/// Creates a new [`Image`] with given image handle.
///
/// [`Image`]: struct.Image.html
pub fn new(image: I) -> Self {
Image {
image,
source: None,
style: Style::default().fill_width().fill_height(),
}
}
/// Sets the portion of the [`Image`] to draw.
///
/// [`Image`]: struct.Image.html
pub fn clip(mut self, source: Rectangle<u16>) -> Self {
self.source = Some(source);
self
}
/// Sets the width of the [`Image`] boundaries in pixels.
///
/// [`Image`]: struct.Image.html
pub fn width(mut self, width: u32) -> Self {
self.style = self.style.width(width);
self
}
/// Sets the height of the [`Image`] boundaries in pixels.
///
/// [`Image`]: struct.Image.html
pub fn height(mut self, height: u32) -> Self {
self.style = self.style.height(height);
self
}
}
impl<I, Message, Renderer> Widget<Message, Renderer> for Image<I>
where
Renderer: self::Renderer<I>,
I: Clone,
{
fn node(&self, _renderer: &Renderer) -> Node {
Node::new(self.style)
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
_cursor_position: Point,
) -> MouseCursor {
renderer.draw(layout.bounds(), self.image.clone(), self.source);
MouseCursor::OutOfBounds
}
fn hash_layout(&self, state: &mut Hasher) {
self.style.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<I> {
/// Draws an [`Image`].
///
/// It receives:
/// * the bounds of the [`Image`]
/// * the handle of the loaded [`Image`]
/// * the portion of the image to draw. If not specified, the entire image
/// should be drawn.
///
/// [`Image`]: struct.Image.html
fn draw(
&mut self,
bounds: Rectangle<f32>,
image: I,
source: Option<Rectangle<u16>>,
);
}
impl<'a, I, Message, Renderer> From<Image<I>> for Element<'a, Message, Renderer>
where
Renderer: self::Renderer<I>,
I: Clone + 'a,
{
fn from(image: Image<I>) -> Element<'a, Message, Renderer> {
Element::new(image)
}
}
|
