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Implement composable, type-safe renderer fallback

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Héctor Ramón Jiménez 2024-03-21 22:27:17 +01:00
parent 7e4ae8450e
commit 3645d34d6a
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35 changed files with 1474 additions and 1210 deletions
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19
widget/src/canvas.rs
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@ -7,7 +7,6 @@ pub use event::Event;
pub use program::Program;
pub use crate::graphics::geometry::*;
pub use crate::renderer::geometry::*;
use crate::core;
use crate::core::layout::{self, Layout};
@ -21,13 +20,19 @@ use crate::graphics::geometry;
use std::marker::PhantomData;
/// A simple cache that stores generated [`Geometry`] to avoid recomputation.
///
/// A [`Cache`] will not redraw its geometry unless the dimensions of its layer
/// change or it is explicitly cleared.
pub type Cache<Renderer = crate::Renderer> = geometry::Cache<Renderer>;
/// A widget capable of drawing 2D graphics.
///
/// ## Drawing a simple circle
/// If you want to get a quick overview, here's how we can draw a simple circle:
///
/// ```no_run
/// # use iced_widget::canvas::{self, Canvas, Fill, Frame, Geometry, Path, Program};
/// # use iced_widget::canvas::{self, frame, Canvas, Fill, Frame, Path, Program};
/// # use iced_widget::core::{Color, Rectangle};
/// # use iced_widget::core::mouse;
/// # use iced_widget::{Renderer, Theme};
@ -42,9 +47,9 @@ use std::marker::PhantomData;
/// impl Program<()> for Circle {
/// type State = ();
///
/// fn draw(&self, _state: &(), renderer: &Renderer, _theme: &Theme, bounds: Rectangle, _cursor: mouse::Cursor) -> Vec<Geometry>{
/// fn draw(&self, _state: &(), renderer: &mut Renderer, _theme: &Theme, bounds: Rectangle, _cursor: mouse::Cursor) {
/// // We prepare a new `Frame`
/// let mut frame = Frame::new(renderer, bounds.size());
/// let mut frame = frame(renderer, bounds.size());
///
/// // We create a `Path` representing a simple circle
/// let circle = Path::circle(frame.center(), self.radius);
@ -53,7 +58,7 @@ use std::marker::PhantomData;
/// frame.fill(&circle, Color::BLACK);
///
/// // Finally, we produce the geometry
/// vec![frame.into_geometry()]
/// renderer.draw_geometry([frame]);
/// }
/// }
///
@ -210,9 +215,7 @@ where
renderer.with_transformation(
Transformation::translate(bounds.x, bounds.y),
|renderer| {
renderer.draw(
self.program.draw(state, renderer, theme, bounds, cursor),
);
self.program.draw(state, renderer, theme, bounds, cursor);
},
);
}