Struct Undoer 

pub struct Undoer<State> {
    settings: Settings,
    undos: VecDeque<State>,
    redos: Vec<State>,
    flux: Option<Flux<State>>,
}

Fields

settings: Settings

undos: VecDeque<State>

Newest at the back. Two adjacent points are never equal, and the newest is often the current state.

redos: Vec<State>

Cleared whenever the state changes, so a fresh edit drops the future.

flux: Option<Flux<State>>

Implementations

impl<State: Clone + PartialEq> Undoer<State>

pub fn with_settings(settings: Settings) -> Self

pub fn has_undo(&self, current: &State) -> bool

Is there a point to go back to that is not where we already stand?

pub fn undo(&mut self, current: &State) -> Option<&State>

pub fn redo(&mut self, current: &State) -> Option<&State>

pub fn add_undo(&mut self, current: &State)

Make current a point, unless it already is the newest one.

pub fn feed_state(&mut self, now: Duration, current: &State)

Offer this frame’s state, and let the two rules decide whether it becomes a point.

Trait Implementations

impl<State: Clone> Clone for Undoer<State>

fn clone(&self) -> Undoer<State>

Returns a duplicate of the value.

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

Performs copy-assignment from source.