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Diffstat (limited to 'native/src/renderer.rs')
| -rw-r--r-- | native/src/renderer.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/native/src/renderer.rs b/native/src/renderer.rs index 833de571..7a68ada4 100644 --- a/native/src/renderer.rs +++ b/native/src/renderer.rs @@ -21,16 +21,32 @@ //! [`checkbox::Renderer`]: ../widget/checkbox/trait.Renderer.html mod debugger; +#[cfg(debug_assertions)] +mod null; mod windowed; pub use debugger::Debugger; +#[cfg(debug_assertions)] +pub use null::Null; pub use windowed::{Target, Windowed}; use crate::{layout, Element}; +/// A component that can take the state of a user interface and produce an +/// output for its users. pub trait Renderer: Sized { + /// The type of output of the [`Renderer`]. + /// + /// If you are implementing a graphical renderer, your output will most + /// likely be a tree of visual primitives. + /// + /// [`Renderer`]: trait.Renderer.html type Output; + /// Lays out the elements of a user interface. + /// + /// You should override this if you need to perform any operations before or + /// after layouting. For instance, trimming the measurements cache. fn layout<'a, Message>( &mut self, element: &Element<'a, Message, Self>, |