diff options
Diffstat (limited to 'widget/src/canvas.rs')
| -rw-r--r-- | widget/src/canvas.rs | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/widget/src/canvas.rs b/widget/src/canvas.rs index 0eda0191..7a21895a 100644 --- a/widget/src/canvas.rs +++ b/widget/src/canvas.rs @@ -6,8 +6,10 @@ mod program; pub use event::Event; pub use program::Program; -pub use crate::graphics::geometry::*; -pub use crate::renderer::geometry::*; +pub use crate::graphics::geometry::{ + fill, gradient, path, stroke, Fill, Gradient, LineCap, LineDash, LineJoin, + Path, Stroke, Style, Text, +}; use crate::core; use crate::core::layout::{self, Layout}; @@ -21,6 +23,19 @@ 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>; + +/// The geometry supported by a renderer. +pub type Geometry<Renderer = crate::Renderer> = + <Renderer as geometry::Renderer>::Geometry; + +/// The frame supported by a renderer. +pub type Frame<Renderer = crate::Renderer> = geometry::Frame<Renderer>; + /// A widget capable of drawing 2D graphics. /// /// ## Drawing a simple circle @@ -42,7 +57,7 @@ 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: &Renderer, _theme: &Theme, bounds: Rectangle, _cursor: mouse::Cursor) -> Vec<Geometry> { /// // We prepare a new `Frame` /// let mut frame = Frame::new(renderer, bounds.size()); /// @@ -210,9 +225,12 @@ where renderer.with_transformation( Transformation::translate(bounds.x, bounds.y), |renderer| { - renderer.draw( - self.program.draw(state, renderer, theme, bounds, cursor), - ); + let layers = + self.program.draw(state, renderer, theme, bounds, cursor); + + for layer in layers { + renderer.draw_geometry(layer); + } }, ); } |