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|
use crate::backend::{self, Backend};
use crate::{Defaults, Primitive, Vector};
use iced_native::layout;
use iced_native::renderer;
use iced_native::{Color, Element, Font, Rectangle};
/// A backend-agnostic renderer that supports all the built-in widgets.
#[derive(Debug)]
pub struct Renderer<B: Backend> {
backend: B,
primitives: Vec<Primitive>,
}
impl<B: Backend> Renderer<B> {
/// Creates a new [`Renderer`] from the given [`Backend`].
pub fn new(backend: B) -> Self {
Self {
backend,
primitives: Vec::new(),
}
}
pub fn backend(&self) -> &B {
&self.backend
}
pub fn present(&mut self, f: impl FnOnce(&mut B, &[Primitive])) {
f(&mut self.backend, &self.primitives);
}
}
impl<B> iced_native::Renderer for Renderer<B>
where
B: Backend,
{
type Defaults = Defaults;
fn layout<'a, Message>(
&mut self,
element: &Element<'a, Message, Self>,
limits: &layout::Limits,
) -> layout::Node {
let layout = element.layout(self, limits);
self.backend.trim_measurements();
layout
}
fn with_layer(
&mut self,
bounds: Rectangle,
offset: Vector<u32>,
f: impl FnOnce(&mut Self),
) {
let current_primitives =
std::mem::replace(&mut self.primitives, Vec::new());
f(self);
let layer_primitives =
std::mem::replace(&mut self.primitives, current_primitives);
self.primitives.push(Primitive::Clip {
bounds,
offset,
content: Box::new(Primitive::Group {
primitives: layer_primitives,
}),
});
}
fn clear(&mut self) {
self.primitives.clear();
}
}
impl<B> renderer::Text for Renderer<B>
where
B: Backend + backend::Text,
{
type Font = Font;
fn fill_text(&mut self, text: renderer::text::Section<'_, Self::Font>) {
dbg!(text);
self.primitives.push(Primitive::Text {
content: text.content.to_string(),
bounds: text.bounds,
size: text.size.unwrap_or(f32::from(self.backend.default_size())),
color: text.color.unwrap_or(Color::BLACK),
font: text.font,
horizontal_alignment: text.horizontal_alignment,
vertical_alignment: text.vertical_alignment,
});
}
}
|
