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use embedded_graphics_core::{Drawable, draw_target::DrawTarget, pixelcolor::PixelColor};
use crate::{
color::AlphaColor,
primitives::{Interpolate, ProposedDimensions},
render::Render,
render_target::EmbeddedGraphicsRenderTarget,
view::View,
};
/// A view that can be converted into an embedded-graphics drawable.
pub trait AsDrawable<Color, Captures: ?Sized> {
/// Converts a view into an object that can be drawn with the [embedded_graphics]
/// crate.
///
/// This trait provides a convenient way to draw views directly by returning
/// an [`embedded_graphics::Drawable`] and internally performing the layout and
/// render tree generation.
///
/// # Examples
///
/// ```
/// use buoyant::view::prelude::*;
/// use embedded_graphics::{mono_font::ascii::FONT_10X20, pixelcolor::Rgb888, prelude::*};
/// use embedded_graphics_simulator::{OutputSettings, SimulatorDisplay, Window};
///
/// let mut display: SimulatorDisplay<Rgb888> = SimulatorDisplay::new(Size::new(480, 320));
///
/// let view = Text::new("Hello Buoyant!", &FONT_10X20)
/// .foreground_color(Rgb888::GREEN);
///
/// view.as_drawable(display.size(), Rgb888::BLACK, &mut ())
/// .draw(&mut display)
/// .unwrap();
/// ```
///
/// [embedded_graphics]: https://docs.rs/embedded_graphics
fn as_drawable(
&self,
size: impl Into<ProposedDimensions>,
default_color: Color,
captures: &mut Captures,
) -> impl Drawable<Color = Color, Output = ()>;
}
impl<Color, Captures: ?Sized, T> AsDrawable<Color, Captures> for T
where
Color: PixelColor + Interpolate + AlphaColor,
T: View<Color, Captures>,
{
fn as_drawable(
&self,
size: impl Into<ProposedDimensions>,
default_color: Color,
captures: &mut Captures,
) -> impl Drawable<Color = Color, Output = ()> {
use crate::{environment::DefaultEnvironment, primitives::Point};
let env = DefaultEnvironment::non_animated();
let mut state = self.build_state(captures);
let layout = self.layout(&size.into(), &env, captures, &mut state);
let render_tree = self.render_tree(&layout, Point::zero(), &env, captures, &mut state);
DrawableView {
render_tree,
default_color,
}
}
}
struct DrawableView<T, C> {
render_tree: T,
default_color: C,
}
impl<T, C> Drawable for DrawableView<T, C>
where
T: Render<C>,
C: PixelColor + Interpolate + AlphaColor,
{
type Color = C;
type Output = ();
fn draw<D>(&self, target: &mut D) -> Result<Self::Output, D::Error>
where
D: DrawTarget<Color = Self::Color>,
{
// create a temporary embedded graphics render target
let mut embedded_target = EmbeddedGraphicsRenderTarget::new(target);
self.render_tree
.render(&mut embedded_target, &self.default_color);
Ok(())
}
}