Struct ViewStack 

pub struct ViewStack<V> { /* private fields */ }

The views of one window: the one shown, the ones Back returns to and the ones Forward goes on to.

Every move hands in where the person is in the view being left, so the stack can give it back on return. Opening a view drops what Forward held, as a browser does.

Implementations

impl<V: Clone + PartialEq> ViewStack<V>

pub fn new(root: V) -> Self

A stack showing root, with nothing to go back or forward to.

pub fn current(&self) -> &V

The view shown.

pub fn place(&self) -> &ViewPlace

Where the person is in the view shown, as last handed in.

pub fn can_go_back(&self) -> bool

pub fn can_go_forward(&self) -> bool

pub fn previous(&self) -> Option<&V>

pub fn open(&mut self, view: V, left: ViewPlace) -> bool

Open view, leaving the one shown at left. Opening the view already shown changes nothing. Returns whether the view changed; a new view starts at the top.

pub fn replace(&mut self, view: V)

Show view in place of the one shown, without a step to go back through: a query view whose text changed as it was typed. Where the person was is kept.

pub fn back(&mut self, left: ViewPlace) -> Option<&ViewEntry<V>>

Go back, leaving the view shown at left. Returns the view now shown and where to put the person in it; None with nothing to go back to.

pub fn forward(&mut self, left: ViewPlace) -> Option<&ViewEntry<V>>

Go forward again, leaving the view shown at left.

pub fn note_place(&mut self, place: ViewPlace)

Hand in where the person is in the view shown, without moving.

pub fn forget(&mut self, gone: impl FnMut(&V) -> bool)

Forget every held view gone says no longer exists (a deleted playlist’s page); the view shown is kept, and its caller decides.

Trait Implementations

impl<V: Clone> Clone for ViewStack<V>

fn clone(&self) -> ViewStack<V>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<V: Debug> Debug for ViewStack<V>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.