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Fix ViewWrapper doc comment

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This commit is contained in:
Alexandre Bury 2017-09-24 18:50:45 -07:00
parent 607e6f1bdc
commit d815afdf78
1 changed files with 9 additions and 6 deletions
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15
src/view/view_wrapper.rs
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@ -19,16 +19,18 @@ pub trait ViewWrapper {
/// Type that this view wraps. /// Type that this view wraps.
type V: View + ?Sized; type V: View + ?Sized;
/// Get an immutable reference to the wrapped view. /// Runs a function on the inner view, returning the result.
/// ///
/// Returns `None` if the inner view is unavailable. /// Returns `None` if the inner view is unavailable. This should only
/// happen with some views if they are already borrowed by another call.
fn with_view<F, R>(&self, f: F) -> Option<R> fn with_view<F, R>(&self, f: F) -> Option<R>
where where
F: FnOnce(&Self::V) -> R; F: FnOnce(&Self::V) -> R;
/// Get a mutable reference to the wrapped view. /// Runs a function on the inner view, returning the result.
/// ///
/// Returns `None` if the inner view is unavailable. /// Returns `None` if the inner view is unavailable. This should only
/// happen with some views if they are already borrowed by another call.
fn with_view_mut<F, R>(&mut self, f: F) -> Option<R> fn with_view_mut<F, R>(&mut self, f: F) -> Option<R>
where where
F: FnOnce(&mut Self::V) -> R; F: FnOnce(&mut Self::V) -> R;
@ -81,11 +83,12 @@ pub trait ViewWrapper {
} }
} }
// Some types easily implement ViewWrapper.
// This includes Box<T: View>
use std::ops::{Deref, DerefMut}; use std::ops::{Deref, DerefMut};
impl<U: View + ?Sized, T: Deref<Target = U> + DerefMut> ViewWrapper for T { impl<U: View + ?Sized, T: Deref<Target = U> + DerefMut> ViewWrapper for T {
type V = U; type V = U;
/// Get an immutable reference to the wrapped view.
fn with_view<F, R>(&self, f: F) -> Option<R> fn with_view<F, R>(&self, f: F) -> Option<R>
where where
F: FnOnce(&Self::V) -> R, F: FnOnce(&Self::V) -> R,
@ -93,7 +96,6 @@ impl<U: View + ?Sized, T: Deref<Target = U> + DerefMut> ViewWrapper for T {
Some(f(self.deref())) Some(f(self.deref()))
} }
/// Get a mutable reference to the wrapped view.
fn with_view_mut<F, R>(&mut self, f: F) -> Option<R> fn with_view_mut<F, R>(&mut self, f: F) -> Option<R>
where where
F: FnOnce(&mut Self::V) -> R, F: FnOnce(&mut Self::V) -> R,
@ -102,6 +104,7 @@ impl<U: View + ?Sized, T: Deref<Target = U> + DerefMut> ViewWrapper for T {
} }
} }
// The main point of implementing ViewWrapper is to have View for free.
impl<T: ViewWrapper> View for T { impl<T: ViewWrapper> View for T {
fn draw(&self, printer: &Printer) { fn draw(&self, printer: &Printer) {
self.wrap_draw(printer); self.wrap_draw(printer);