Struct druid::lens::Field

pub struct Field<Get, GetMut> { /* fields omitted */ }

Lens accessing a member of some type using accessor functions

See also the lens macro.

let lens = druid::lens::Field::new(|x: &Vec<u32>| &x[42], |x| &mut x[42]);

Implementations

impl<Get, GetMut> Field<Get, GetMut>

pub fn new<T: ?Sized, U: ?Sized>(get: Get, get_mut: GetMut) -> Self where
    Get: Fn(&T) -> &U,
    GetMut: Fn(&mut T) -> &mut U, 

Construct a lens from a pair of getter functions

Trait Implementations

impl<T, U, Get, GetMut> Lens<T, U> for Field<Get, GetMut> where
    T: ?Sized,
    U: ?Sized,
    Get: Fn(&T) -> &U,
    GetMut: Fn(&mut T) -> &mut U, 

fn with<V, F: FnOnce(&U) -> V>(&self, data: &T, f: F) -> V

Get non-mut access to the field.

fn with_mut<V, F: FnOnce(&mut U) -> V>(&self, data: &mut T, f: F) -> V

Get mutable access to the field.